122 files changed, 36143 insertions, 0 deletions
diff --git a/vendor/paragonie/random_compat/LICENSE b/vendor/paragonie/random_compat/LICENSE
new file mode 100644
index 0000000..45c7017
--- /dev/null
+++ b/vendor/paragonie/random_compat/LICENSE
@@ -0,0 +1,22 @@
+The MIT License (MIT)
+
+Copyright (c) 2015 Paragon Initiative Enterprises
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
diff --git a/vendor/paragonie/random_compat/build-phar.sh b/vendor/paragonie/random_compat/build-phar.sh
new file mode 100644
index 0000000..b4a5ba3
--- /dev/null
+++ b/vendor/paragonie/random_compat/build-phar.sh
@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+
+basedir=$( dirname $( readlink -f ${BASH_SOURCE[0]} ) )
+
+php -dphar.readonly=0 "$basedir/other/build_phar.php" $*
+\ No newline at end of file
diff --git a/vendor/paragonie/random_compat/composer.json b/vendor/paragonie/random_compat/composer.json
new file mode 100644
index 0000000..1725089
--- /dev/null
+++ b/vendor/paragonie/random_compat/composer.json
@@ -0,0 +1,34 @@
+{
+  "name":         "paragonie/random_compat",
+  "description":  "PHP 5.x polyfill for random_bytes() and random_int() from PHP 7",
+  "keywords": [
+    "csprng",
+    "random",
+    "polyfill",
+    "pseudorandom"
+  ],
+  "license":      "MIT",
+  "type":         "library",
+  "authors": [
+    {
+      "name":     "Paragon Initiative Enterprises",
+      "email":    "security@paragonie.com",
+      "homepage": "https://paragonie.com"
+    }
+  ],
+  "support": {
+    "issues":     "https://github.com/paragonie/random_compat/issues",
+    "email":      "info@paragonie.com",
+    "source":     "https://github.com/paragonie/random_compat"
+  },
+  "require": {
+    "php": ">= 7"
+  },
+  "require-dev": {
+    "vimeo/psalm": "^1",
+    "phpunit/phpunit": "4.*|5.*"
+  },
+  "suggest": {
+    "ext-libsodium": "Provides a modern crypto API that can be used to generate random bytes."
+  }
+}
diff --git a/vendor/paragonie/random_compat/dist/random_compat.phar.pubkey b/vendor/paragonie/random_compat/dist/random_compat.phar.pubkey
new file mode 100644
index 0000000..eb50ebf
--- /dev/null
+++ b/vendor/paragonie/random_compat/dist/random_compat.phar.pubkey
@@ -0,0 +1,5 @@
+-----BEGIN PUBLIC KEY-----
+MHYwEAYHKoZIzj0CAQYFK4EEACIDYgAEEd+wCqJDrx5B4OldM0dQE0ZMX+lx1ZWm
+pui0SUqD4G29L3NGsz9UhJ/0HjBdbnkhIK5xviT0X5vtjacF6ajgcCArbTB+ds+p
++h7Q084NuSuIpNb6YPfoUFgC/CL9kAoc
+-----END PUBLIC KEY-----
diff --git a/vendor/paragonie/random_compat/dist/random_compat.phar.pubkey.asc b/vendor/paragonie/random_compat/dist/random_compat.phar.pubkey.asc
new file mode 100644
index 0000000..6a1d7f3
--- /dev/null
+++ b/vendor/paragonie/random_compat/dist/random_compat.phar.pubkey.asc
@@ -0,0 +1,11 @@
+-----BEGIN PGP SIGNATURE-----
+Version: GnuPG v2.0.22 (MingW32)
+
+iQEcBAABAgAGBQJWtW1hAAoJEGuXocKCZATaJf0H+wbZGgskK1dcRTsuVJl9IWip
+QwGw/qIKI280SD6/ckoUMxKDCJiFuPR14zmqnS36k7N5UNPnpdTJTS8T11jttSpg
+1LCmgpbEIpgaTah+cELDqFCav99fS+bEiAL5lWDAHBTE/XPjGVCqeehyPYref4IW
+NDBIEsvnHPHPLsn6X5jq4+Yj5oUixgxaMPiR+bcO4Sh+RzOVB6i2D0upWfRXBFXA
+NNnsg9/zjvoC7ZW73y9uSH+dPJTt/Vgfeiv52/v41XliyzbUyLalf02GNPY+9goV
+JHG1ulEEBJOCiUD9cE1PUIJwHA/HqyhHIvV350YoEFiHl8iSwm7SiZu5kPjaq74=
+=B6+8
+-----END PGP SIGNATURE-----
diff --git a/vendor/paragonie/random_compat/lib/random.php b/vendor/paragonie/random_compat/lib/random.php
new file mode 100644
index 0000000..c7731a5
--- /dev/null
+++ b/vendor/paragonie/random_compat/lib/random.php
@@ -0,0 +1,32 @@
+<?php
+/**
+ * Random_* Compatibility Library
+ * for using the new PHP 7 random_* API in PHP 5 projects
+ *
+ * @version 2.99.99
+ * @released 2018-06-06
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015 - 2018 Paragon Initiative Enterprises
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+// NOP
diff --git a/vendor/paragonie/random_compat/other/build_phar.php b/vendor/paragonie/random_compat/other/build_phar.php
new file mode 100644
index 0000000..70ef4b2
--- /dev/null
+++ b/vendor/paragonie/random_compat/other/build_phar.php
@@ -0,0 +1,57 @@
+<?php
+$dist = dirname(__DIR__).'/dist';
+if (!is_dir($dist)) {
+    mkdir($dist, 0755);
+}
+if (file_exists($dist.'/random_compat.phar')) {
+    unlink($dist.'/random_compat.phar');
+}
+$phar = new Phar(
+    $dist.'/random_compat.phar',
+    FilesystemIterator::CURRENT_AS_FILEINFO | \FilesystemIterator::KEY_AS_FILENAME,
+    'random_compat.phar'
+);
+rename(
+    dirname(__DIR__).'/lib/random.php', 
+    dirname(__DIR__).'/lib/index.php'
+);
+$phar->buildFromDirectory(dirname(__DIR__).'/lib');
+rename(
+    dirname(__DIR__).'/lib/index.php', 
+    dirname(__DIR__).'/lib/random.php'
+);
+
+/**
+ * If we pass an (optional) path to a private key as a second argument, we will
+ * sign the Phar with OpenSSL.
+ * 
+ * If you leave this out, it will produce an unsigned .phar!
+ */
+if ($argc > 1) {
+    if (!@is_readable($argv[1])) {
+        echo 'Could not read the private key file:', $argv[1], "\n";
+        exit(255);
+    }
+    $pkeyFile = file_get_contents($argv[1]);
+    
+    $private = openssl_get_privatekey($pkeyFile);
+    if ($private !== false) {
+        $pkey = '';
+        openssl_pkey_export($private, $pkey);
+        $phar->setSignatureAlgorithm(Phar::OPENSSL, $pkey);
+        
+        /**
+         * Save the corresponding public key to the file
+         */
+        if (!@is_readable($dist.'/random_compat.phar.pubkey')) {
+            $details = openssl_pkey_get_details($private);
+            file_put_contents(
+                $dist.'/random_compat.phar.pubkey',
+                $details['key']
+            );
+        }
+    } else {
+        echo 'An error occurred reading the private key from OpenSSL.', "\n";
+        exit(255);
+    }
+}
diff --git a/vendor/paragonie/random_compat/psalm-autoload.php b/vendor/paragonie/random_compat/psalm-autoload.php
new file mode 100644
index 0000000..d71d1b8
--- /dev/null
+++ b/vendor/paragonie/random_compat/psalm-autoload.php
@@ -0,0 +1,9 @@
+<?php
+
+require_once 'lib/byte_safe_strings.php';
+require_once 'lib/cast_to_int.php';
+require_once 'lib/error_polyfill.php';
+require_once 'other/ide_stubs/libsodium.php';
+require_once 'lib/random.php';
+
+$int = random_int(0, 65536);
diff --git a/vendor/paragonie/random_compat/psalm.xml b/vendor/paragonie/random_compat/psalm.xml
new file mode 100644
index 0000000..596d99d
--- /dev/null
+++ b/vendor/paragonie/random_compat/psalm.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0"?>
+<psalm
+    autoloader="psalm-autoload.php"
+    stopOnFirstError="false"
+    useDocblockTypes="true"
+>
+    <projectFiles>
+        <directory name="lib" />
+    </projectFiles>
+    <issueHandlers>
+        <RedundantConditionGivenDocblockType errorLevel="info" />
+        <UnresolvableInclude errorLevel="info" />
+        <DuplicateClass errorLevel="info" />
+        <InvalidOperand errorLevel="info" />
+        <UndefinedConstant errorLevel="info" />
+        <MissingReturnType errorLevel="info" />
+        <InvalidReturnType errorLevel="info" />
+    </issueHandlers>
+</psalm>
diff --git a/vendor/paragonie/sodium_compat/.github/workflows/ci.yml b/vendor/paragonie/sodium_compat/.github/workflows/ci.yml
new file mode 100644
index 0000000..f570b84
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/.github/workflows/ci.yml
@@ -0,0 +1,96 @@
+name: CI
+
+on: [push]
+
+jobs:
+  old:
+    name: PHP ${{ matrix.php-versions }} Test on ${{ matrix.operating-system }}
+    runs-on: ${{ matrix.operating-system }}
+    strategy:
+      matrix:
+        operating-system: ['ubuntu-16.04']
+        php-versions: ['5.3', '5.4', '5.5', '5.6', '7.0']
+        phpunit-versions: ['7.5.20']
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-versions }}
+          extensions: mbstring, intl
+          ini-values: post_max_size=256M, max_execution_time=180
+          tools: psalm, phpunit:${{ matrix.phpunit-versions }}
+
+      - name: Install dependencies
+        run: composer self-update --1; composer install
+
+      - name: PHPUnit tests
+        uses: php-actions/phpunit@v2
+        with:
+          memory_limit: 256M
+
+  moderate:
+    name: PHP ${{ matrix.php-versions }} Test on ${{ matrix.operating-system }}
+    runs-on: ${{ matrix.operating-system }}
+    strategy:
+      matrix:
+        operating-system: ['ubuntu-latest']
+        php-versions: ['7.1', '7.2', '7.3']
+        phpunit-versions: ['latest']
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-versions }}
+          extensions: mbstring, intl, sodium
+          ini-values: post_max_size=256M, max_execution_time=180
+          tools: psalm, phpunit:${{ matrix.phpunit-versions }}
+
+      - name: Install dependencies
+        run: composer install
+
+      - name: PHPUnit tests
+        uses: php-actions/phpunit@v2
+        timeout-minutes: 30
+        with:
+          memory_limit: 256M
+
+  modern:
+    name: PHP ${{ matrix.php-versions }} Test on ${{ matrix.operating-system }}
+    runs-on: ${{ matrix.operating-system }}
+    strategy:
+      matrix:
+        operating-system: ['ubuntu-latest']
+        php-versions: ['7.4', '8.0']
+        phpunit-versions: ['latest']
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-versions }}
+          extensions: mbstring, intl, sodium
+          ini-values: post_max_size=256M, max_execution_time=180
+          tools: psalm, phpunit:${{ matrix.phpunit-versions }}
+
+      - name: Install dependencies
+        run: composer install
+
+      - name: PHPUnit tests
+        uses: php-actions/phpunit@v2
+        timeout-minutes: 30
+        with:
+          memory_limit: 256M
+
+      - name: Install Psalm
+        run: composer require --dev vimeo/psalm:^4; cp psalm-above-3.xml psalm.xml
+
+      - name: Static Analysis
+        run: vendor/bin/psalm
diff --git a/vendor/paragonie/sodium_compat/.gitignore b/vendor/paragonie/sodium_compat/.gitignore
new file mode 100644
index 0000000..0df5a6d
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/.gitignore
@@ -0,0 +1,9 @@
+/.idea/
+/.php_cs.cache
+/.phpunit.result.cache
+/box/
+/dist/sodium-compat.phar
+/dist/sodium-compat.phar.sig
+/composer.lock
+/vendor/
+/psalm.xml
diff --git a/vendor/paragonie/sodium_compat/LICENSE b/vendor/paragonie/sodium_compat/LICENSE
new file mode 100644
index 0000000..184e442
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/LICENSE
@@ -0,0 +1,16 @@
+ISC License
+
+Copyright (c) 2016-2021, Paragon Initiative Enterprises <security at paragonie dot com>
+Copyright (c) 2013-2019, Frank Denis <j at pureftpd dot org>
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
diff --git a/vendor/paragonie/sodium_compat/README.md b/vendor/paragonie/sodium_compat/README.md
new file mode 100644
index 0000000..a50508c
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/README.md
@@ -0,0 +1,347 @@
+# Sodium Compat
+
+[![Build Status](https://github.com/paragonie/sodium_compat/actions/workflows/ci.yml/badge.svg)](https://github.com/paragonie/sodium_compat/actions)
+[![Windows Build Status](https://ci.appveyor.com/api/projects/status/itcx1vgmfqiawgbe?svg=true)](https://ci.appveyor.com/project/paragonie-scott/sodium-compat)
+[![Latest Stable Version](https://poser.pugx.org/paragonie/sodium_compat/v/stable)](https://packagist.org/packages/paragonie/sodium_compat)
+[![Latest Unstable Version](https://poser.pugx.org/paragonie/sodium_compat/v/unstable)](https://packagist.org/packages/paragonie/sodium_compat)
+[![License](https://poser.pugx.org/paragonie/sodium_compat/license)](https://packagist.org/packages/paragonie/sodium_compat)
+[![Downloads](https://img.shields.io/packagist/dt/paragonie/sodium_compat.svg)](https://packagist.org/packages/paragonie/sodium_compat)
+
+Sodium Compat is a pure PHP polyfill for the Sodium cryptography library 
+(libsodium), a core extension in PHP 7.2.0+ and otherwise [available in PECL](https://pecl.php.net/package/libsodium).
+
+This library tentativeley supports PHP 5.2.4 - 8.x (latest), but officially
+only supports [non-EOL'd versions of PHP](https://secure.php.net/supported-versions.php).
+
+If you have the PHP extension installed, Sodium Compat will opportunistically
+and transparently use the PHP extension instead of our implementation.
+
+## IMPORTANT!
+
+This cryptography library has not been formally audited by an independent third 
+party that specializes in cryptography or cryptanalysis.
+
+If you require such an audit before you can use sodium_compat in your projects
+and have the funds for such an audit, please open an issue or contact 
+`security at paragonie dot com` so we can help get the ball rolling.
+
+However, sodium_compat has been adopted by high profile open source projects,
+such as [Joomla!](https://github.com/joomla/joomla-cms/blob/459d74686d2a638ec51149d7c44ddab8075852be/composer.json#L40)
+and [Magento](https://github.com/magento/magento2/blob/8fd89cfdf52c561ac0ca7bc20fd38ef688e201b0/composer.json#L44).
+Furthermore, sodium_compat was developed by Paragon Initiative Enterprises, a
+company that *specializes* in secure PHP development and PHP cryptography, and
+has been informally reviewed by many other security experts who also specialize
+in PHP.
+
+If you'd like to learn more about the defensive security measures we've taken
+to prevent sodium_compat from being a source of vulnerability in your systems,
+please read [*Cryptographically Secure PHP Development*](https://paragonie.com/blog/2017/02/cryptographically-secure-php-development).
+
+# Installing Sodium Compat
+
+If you're using Composer:
+
+```bash
+composer require paragonie/sodium_compat
+```
+
+### Install From Source
+
+If you're not using Composer, download a [release tarball](https://github.com/paragonie/sodium_compat/releases)
+(which should be signed with [our GnuPG public key](https://paragonie.com/static/gpg-public-key.txt)), extract
+its contents, then include our `autoload.php` script in your project.
+
+```php
+<?php
+require_once "/path/to/sodium_compat/autoload.php";
+```
+
+### PHP Archives (Phar) Releases
+
+Since version 1.3.0, [sodium_compat releases](https://github.com/paragonie/sodium_compat/releases) include a
+PHP Archive (.phar file) and associated GPG signature. First, download both files and verify them with our
+GPG public key, like so:
+
+```bash
+# Getting our public key from the keyserver:
+gpg --fingerprint 7F52D5C61D1255C731362E826B97A1C2826404DA
+if [ $? -ne 0 ]; then
+    echo -e "\033[33mDownloading PGP Public Key...\033[0m"
+    gpg  --keyserver pgp.mit.edu --recv-keys 7F52D5C61D1255C731362E826B97A1C2826404DA
+    # Security <security@paragonie.com>
+    gpg --fingerprint 7F52D5C61D1255C731362E826B97A1C2826404DA
+    if [ $? -ne 0 ]; then
+        echo -e "\033[31mCould not download PGP public key for verification\033[0m"
+        exit 1
+    fi
+fi
+
+# Verifying the PHP Archive
+gpg --verify sodium-compat.phar.sig sodium-compat.phar
+```
+
+Now, simply include this .phar file in your application.
+
+```php
+<?php
+require_once "/path/to/sodium-compat.phar";
+```
+
+# Support
+
+[Commercial support for libsodium](https://download.libsodium.org/doc/commercial_support/) is available
+from multiple vendors. If you need help using sodium_compat in one of your projects, [contact Paragon Initiative Enterprises](https://paragonie.com/contact). 
+
+Non-commercial report will be facilitated through [Github issues](https://github.com/paragonie/sodium_compat/issues).
+We offer no guarantees of our availability to resolve questions about integrating sodium_compat into third-party
+software for free, but will strive to fix any bugs (security-related or otherwise) in our library.
+
+## Support Contracts
+
+If your company uses this library in their products or services, you may be
+interested in [purchasing a support contract from Paragon Initiative Enterprises](https://paragonie.com/enterprise).
+
+# Using Sodium Compat
+
+## True Polyfill
+
+If you're using PHP 5.3.0 or newer and do not have the PECL extension installed,
+you can just use the [standard ext/sodium API features as-is](https://paragonie.com/book/pecl-libsodium)
+and the polyfill will work its magic.
+
+```php
+<?php
+require_once "/path/to/sodium_compat/autoload.php";
+
+$alice_kp = \Sodium\crypto_sign_keypair();
+$alice_sk = \Sodium\crypto_sign_secretkey($alice_kp);
+$alice_pk = \Sodium\crypto_sign_publickey($alice_kp);
+
+$message = 'This is a test message.';
+$signature = \Sodium\crypto_sign_detached($message, $alice_sk);
+if (\Sodium\crypto_sign_verify_detached($signature, $message, $alice_pk)) {
+    echo 'OK', PHP_EOL;
+} else {
+    throw new Exception('Invalid signature');
+}
+```
+
+The polyfill does not expose this API on PHP < 5.3, or if you have the PHP
+extension installed already.
+
+## General-Use Polyfill
+
+If your users are on PHP < 5.3, or you want to write code that will work
+whether or not the PECL extension is available, you'll want to use the
+**`ParagonIE_Sodium_Compat`** class for most of your libsodium needs.
+
+The above example, written for general use:
+
+```php
+<?php
+require_once "/path/to/sodium_compat/autoload.php";
+
+$alice_kp = ParagonIE_Sodium_Compat::crypto_sign_keypair();
+$alice_sk = ParagonIE_Sodium_Compat::crypto_sign_secretkey($alice_kp);
+$alice_pk = ParagonIE_Sodium_Compat::crypto_sign_publickey($alice_kp);
+
+$message = 'This is a test message.';
+$signature = ParagonIE_Sodium_Compat::crypto_sign_detached($message, $alice_sk);
+if (ParagonIE_Sodium_Compat::crypto_sign_verify_detached($signature, $message, $alice_pk)) {
+    echo 'OK', PHP_EOL;
+} else {
+    throw new Exception('Invalid signature');
+}
+```
+
+Generally: If you replace `\Sodium\ ` with `ParagonIE_Sodium_Compat::`, any
+code already written for the libsodium PHP extension should work with our
+polyfill without additional code changes.
+
+Since this doesn't require a namespace, this API *is* exposed on PHP 5.2.
+
+Since version 0.7.0, we have our own namespaced API (`ParagonIE\Sodium\*`) to allow brevity
+in software that uses PHP 5.3+. This is useful if you want to use our file cryptography 
+features without writing `ParagonIE_Sodium_File` every time. This is not exposed on PHP < 5.3,
+so if your project supports PHP < 5.3, use the underscore method instead.
+
+To learn how to use Libsodium, read [*Using Libsodium in PHP Projects*](https://paragonie.com/book/pecl-libsodium).
+
+## PHP 7.2 Polyfill
+
+As per the [second vote on the libsodium RFC](https://wiki.php.net/rfc/libsodium#proposed_voting_choices),
+PHP 7.2 uses `sodium_*` instead of `\Sodium\*`.
+
+```php
+<?php
+require_once "/path/to/sodium_compat/autoload.php";
+
+$alice_kp = sodium_crypto_sign_keypair();
+$alice_sk = sodium_crypto_sign_secretkey($alice_kp);
+$alice_pk = sodium_crypto_sign_publickey($alice_kp);
+
+$message = 'This is a test message.';
+$signature = sodium_crypto_sign_detached($message, $alice_sk);
+if (sodium_crypto_sign_verify_detached($signature, $message, $alice_pk)) {
+    echo 'OK', PHP_EOL;
+} else {
+    throw new Exception('Invalid signature');
+}
+```
+
+## Help, Sodium_Compat is Slow! How can I make it fast?
+
+There are three ways to make it fast:
+
+1. Use PHP 7.2.
+2. [Install the libsodium PHP extension from PECL](https://paragonie.com/book/pecl-libsodium/read/00-intro.md#installing-libsodium).
+3. Only if the previous two options are not available for you:
+   1. Verify that [the processor you're using actually implements constant-time multiplication](https://bearssl.org/ctmul.html).
+      Sodium_compat does, but it must trade some speed in order to attain cross-platform security.
+   2. Only if you are 100% certain that your processor is safe, you can set `ParagonIE_Sodium_Compat::$fastMult = true;`
+      without harming the security of your cryptography keys. If your processor *isn't* safe, then decide whether you
+      want speed or security because you can't have both.
+
+### How can I tell if sodium_compat will be slow, at runtime?
+
+Since version 1.8, you can use the `polyfill_is_fast()` static method to
+determine if sodium_compat will be slow at runtime.
+
+```php
+<?php
+if (ParagonIE_Sodium_Compat::polyfill_is_fast()) {
+    // Use libsodium now
+    $process->execute();
+} else {
+    // Defer to a cron job or other sort of asynchronous process
+    $process->enqueue();
+}
+```
+
+### Help, my PHP only has 32-Bit Integers! It's super slow!
+
+Some features of sodium_compat are ***incredibly slow* with PHP 5 on Windows**
+(in particular: public-key cryptography (encryption and signatures) is
+affected), and there is nothing we can do about that, due to platform
+restrictions on integers.
+
+For acceptable performance, we highly recommend Windows users to version 1.0.6
+of the libsodium extension from PECL or, alternatively, simply upgrade to PHP 7
+and the slowdown will be greatly reduced.
+
+This is also true of non-Windows 32-bit operating systems, or if somehow PHP
+was compiled where `PHP_INT_SIZE` equals `4` instead of `8` (i.e. Linux on i386).
+
+## Documentation
+
+First, you'll want to read the [Libsodium Quick Reference](https://paragonie.com/blog/2017/06/libsodium-quick-reference-quick-comparison-similar-functions-and-which-one-use).
+It aims to answer, "Which function should I use for [common problem]?".
+
+If you don't find the answers in the Quick Reference page, check out
+[*Using Libsodium in PHP Projects*](https://paragonie.com/book/pecl-libsodium).
+
+Finally, the [official libsodium documentation](https://download.libsodium.org/doc/) 
+(which was written for the C library, not the PHP library) also contains a lot of
+insightful technical information you may find helpful.
+
+## API Coverage
+
+**Recommended reading:** [Libsodium Quick Reference](https://paragonie.com/blog/2017/06/libsodium-quick-reference-quick-comparison-similar-functions-and-which-one-use)
+
+* Mainline NaCl Features
+    * `crypto_auth()`
+    * `crypto_auth_verify()`
+    * `crypto_box()`
+    * `crypto_box_open()`
+    * `crypto_scalarmult()`
+    * `crypto_secretbox()`
+    * `crypto_secretbox_open()`
+    * `crypto_sign()`
+    * `crypto_sign_open()`
+* PECL Libsodium Features
+    * `crypto_aead_aes256gcm_encrypt()`
+    * `crypto_aead_aes256gcm_decrypt()`
+    * `crypto_aead_chacha20poly1305_encrypt()`
+    * `crypto_aead_chacha20poly1305_decrypt()`
+    * `crypto_aead_chacha20poly1305_ietf_encrypt()`
+    * `crypto_aead_chacha20poly1305_ietf_decrypt()`
+    * `crypto_aead_xchacha20poly1305_ietf_encrypt()`
+    * `crypto_aead_xchacha20poly1305_ietf_decrypt()`
+    * `crypto_box_xchacha20poly1305()`
+    * `crypto_box_xchacha20poly1305_open()`
+    * `crypto_box_seal()`
+    * `crypto_box_seal_open()`
+    * `crypto_generichash()`
+    * `crypto_generichash_init()`
+    * `crypto_generichash_update()`
+    * `crypto_generichash_final()`
+    * `crypto_kx()`
+    * `crypto_secretbox_xchacha20poly1305()`
+    * `crypto_secretbox_xchacha20poly1305_open()`
+    * `crypto_shorthash()`
+    * `crypto_sign_detached()`
+    * `crypto_sign_ed25519_pk_to_curve25519()`
+    * `crypto_sign_ed25519_sk_to_curve25519()`
+    * `crypto_sign_verify_detached()`
+    * For advanced users only:
+        * `crypto_stream()`
+        * `crypto_stream_xor()`
+    * Other utilities (e.g. `crypto_*_keypair()`)
+        * `add()`
+        * `base642bin()`
+        * `bin2base64()`
+        * `bin2hex()`
+        * `hex2bin()`
+        * `crypto_kdf_derive_from_key()`
+        * `crypto_kx_client_session_keys()`
+        * `crypto_kx_server_session_keys()`
+        * `crypto_secretstream_xchacha20poly1305_init_push()`
+        * `crypto_secretstream_xchacha20poly1305_push()`
+        * `crypto_secretstream_xchacha20poly1305_init_pull()`
+        * `crypto_secretstream_xchacha20poly1305_pull()`
+        * `crypto_secretstream_xchacha20poly1305_rekey()`
+        * `pad()`
+        * `unpad()`
+
+### Cryptography Primitives Provided
+
+* **X25519** - Elliptic Curve Diffie Hellman over Curve25519
+* **Ed25519** - Edwards curve Digital Signature Algorithm over Curve25519
+* **Xsalsa20** - Extended-nonce Salsa20 stream cipher
+* **ChaCha20** - Stream cipher
+* **Xchacha20** - Extended-nonce ChaCha20 stream cipher
+* **Poly1305** - Polynomial Evaluation Message Authentication Code modulo 2^130 - 5
+* **BLAKE2b** - Cryptographic Hash Function
+* **SipHash-2-4** - Fast hash, but not collision-resistant; ideal for hash tables.
+
+### Features Excluded from this Polyfill
+
+* `\Sodium\memzero()` - Although we expose this API endpoint, we can't reliably
+  zero buffers from PHP.
+  
+  If you have the PHP extension installed, sodium_compat
+  will use the native implementation to zero out the string provided. Otherwise
+  it will throw a `SodiumException`.
+* `\Sodium\crypto_pwhash()` - It's not feasible to polyfill scrypt or Argon2
+  into PHP and get reasonable performance. Users would feel motivated to select
+  parameters that downgrade security to avoid denial of service (DoS) attacks.
+  
+  The only winning move is not to play.
+  
+  If ext/sodium or ext/libsodium is installed, these API methods will fallthrough
+  to the extension. Otherwise, our polyfill library will throw a `SodiumException`.
+  
+  To detect support for Argon2i at runtime, use
+  `ParagonIE_Sodium_Compat::crypto_pwhash_is_available()`, which returns a
+   boolean value (`TRUE` or `FALSE`).
+
+### PHPCompatibility Ruleset
+
+For sodium_compat users and that utilize [`PHPCompatibility`](https://github.com/PHPCompatibility/PHPCompatibility)
+in their CI process, there is now a custom ruleset available which can be used
+to prevent false positives being thrown by `PHPCompatibility` for the native
+PHP functionality being polyfilled by this repo.
+
+You can find the repo for the `PHPCompatibilityParagonieSodiumCompat` ruleset
+here [on Github](https://github.com/PHPCompatibility/PHPCompatibilityParagonie) 
+and [on Packagist](https://packagist.org/packages/phpcompatibility/phpcompatibility-paragonie).
diff --git a/vendor/paragonie/sodium_compat/appveyor.yml b/vendor/paragonie/sodium_compat/appveyor.yml
new file mode 100644
index 0000000..9621e9a
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/appveyor.yml
@@ -0,0 +1,27 @@
+build: false
+shallow_clone: false
+platform:
+  - x86
+  - x64
+clone_folder: C:\projects\sodium_compat
+image: Visual Studio 2017
+
+install:
+  - cinst -y OpenSSL.Light
+  - SET PATH=C:\Program Files\OpenSSL;%PATH%
+  - sc config wuauserv start= auto
+  - net start wuauserv
+  - cinst -y php --version 5.6.30
+  - cd c:\tools\php56
+  - copy php.ini-production php.ini
+  - echo date.timezone="UTC" >> php.ini
+  - echo extension_dir=ext >> php.ini
+  - echo extension=php_openssl.dll >> php.ini
+  - cd C:\projects\sodium_compat
+  - SET PATH=C:\tools\php56;%PATH%
+  - php.exe -r "readfile('http://getcomposer.org/installer');" | php.exe
+  - php.exe composer.phar install --prefer-source --no-interaction
+
+test_script:
+  - cd C:\projects\sodium_compat
+  - vendor\bin\phpunit.bat tests/Windows32Test.php
diff --git a/vendor/paragonie/sodium_compat/autoload-fast.php b/vendor/paragonie/sodium_compat/autoload-fast.php
new file mode 100644
index 0000000..08724d1
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/autoload-fast.php
@@ -0,0 +1,4 @@
+<?php
+
+require_once 'autoload.php';
+ParagonIE_Sodium_Compat::$fastMult = true;
diff --git a/vendor/paragonie/sodium_compat/autoload-pedantic.php b/vendor/paragonie/sodium_compat/autoload-pedantic.php
new file mode 100644
index 0000000..e4646ca
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/autoload-pedantic.php
@@ -0,0 +1,6 @@
+<?php
+
+require_once 'autoload.php';
+define('DO_PEDANTIC_TEST', true);
+
+ParagonIE_Sodium_Compat::$fastMult = true;
diff --git a/vendor/paragonie/sodium_compat/autoload-php7.php b/vendor/paragonie/sodium_compat/autoload-php7.php
new file mode 100644
index 0000000..4824860
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/autoload-php7.php
@@ -0,0 +1,31 @@
+<?php
+/*
+ This file should only ever be loaded on PHP 7+
+ */
+if (PHP_VERSION_ID < 70000) {
+    return;
+}
+
+spl_autoload_register(function ($class) {
+    $namespace = 'ParagonIE_Sodium_';
+    // Does the class use the namespace prefix?
+    $len = strlen($namespace);
+    if (strncmp($namespace, $class, $len) !== 0) {
+        // no, move to the next registered autoloader
+        return false;
+    }
+
+    // Get the relative class name
+    $relative_class = substr($class, $len);
+
+    // Replace the namespace prefix with the base directory, replace namespace
+    // separators with directory separators in the relative class name, append
+    // with .php
+    $file = dirname(__FILE__) . '/src/' . str_replace('_', '/', $relative_class) . '.php';
+    // if the file exists, require it
+    if (file_exists($file)) {
+        require_once $file;
+        return true;
+    }
+    return false;
+});
diff --git a/vendor/paragonie/sodium_compat/autoload-phpunit.php b/vendor/paragonie/sodium_compat/autoload-phpunit.php
new file mode 100644
index 0000000..05b003a
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/autoload-phpunit.php
@@ -0,0 +1,8 @@
+<?php
+
+require_once (dirname(__FILE__) . '/vendor/autoload.php');
+
+if (PHP_VERSION_ID >= 50300) {
+    require_once (dirname(__FILE__) . '/tests/phpunit-shim.php');
+}
+require_once (dirname(__FILE__) . '/autoload.php');
diff --git a/vendor/paragonie/sodium_compat/autoload.php b/vendor/paragonie/sodium_compat/autoload.php
new file mode 100644
index 0000000..c5c23b4
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/autoload.php
@@ -0,0 +1,72 @@
+<?php
+
+if (PHP_VERSION_ID < 70000) {
+    if (!is_callable('sodiumCompatAutoloader')) {
+        /**
+         * Sodium_Compat autoloader.
+         *
+         * @param string $class Class name to be autoloaded.
+         *
+         * @return bool         Stop autoloading?
+         */
+        function sodiumCompatAutoloader($class)
+        {
+            $namespace = 'ParagonIE_Sodium_';
+            // Does the class use the namespace prefix?
+            $len = strlen($namespace);
+            if (strncmp($namespace, $class, $len) !== 0) {
+                // no, move to the next registered autoloader
+                return false;
+            }
+
+            // Get the relative class name
+            $relative_class = substr($class, $len);
+
+            // Replace the namespace prefix with the base directory, replace namespace
+            // separators with directory separators in the relative class name, append
+            // with .php
+            $file = dirname(__FILE__) . '/src/' . str_replace('_', '/', $relative_class) . '.php';
+            // if the file exists, require it
+            if (file_exists($file)) {
+                require_once $file;
+                return true;
+            }
+            return false;
+        }
+
+        // Now that we have an autoloader, let's register it!
+        spl_autoload_register('sodiumCompatAutoloader');
+    }
+} else {
+    require_once dirname(__FILE__) . '/autoload-php7.php';
+}
+
+/* Explicitly, always load the Compat class: */
+require_once dirname(__FILE__) . '/src/Compat.php';
+
+if (!class_exists('SodiumException', false)) {
+    require_once dirname(__FILE__) . '/src/SodiumException.php';
+}
+if (PHP_VERSION_ID >= 50300) {
+    // Namespaces didn't exist before 5.3.0, so don't even try to use this
+    // unless PHP >= 5.3.0
+    require_once dirname(__FILE__) . '/lib/namespaced.php';
+    require_once dirname(__FILE__) . '/lib/sodium_compat.php';
+} else {
+    require_once dirname(__FILE__) . '/src/PHP52/SplFixedArray.php';
+}
+if (PHP_VERSION_ID < 70200 || !extension_loaded('sodium')) {
+    if (PHP_VERSION_ID >= 50300 && !defined('SODIUM_CRYPTO_SCALARMULT_BYTES')) {
+        require_once dirname(__FILE__) . '/lib/php72compat_const.php';
+    }
+    if (PHP_VERSION_ID >= 70000) {
+        assert(class_exists('ParagonIE_Sodium_Compat'), 'Possible filesystem/autoloader bug?');
+    } else {
+        assert(class_exists('ParagonIE_Sodium_Compat'));
+    }
+    require_once(dirname(__FILE__) . '/lib/php72compat.php');
+} elseif (!function_exists('sodium_crypto_stream_xchacha20_xor')) {
+    // Older versions of {PHP, ext/sodium} will not define these
+    require_once(dirname(__FILE__) . '/lib/php72compat.php');
+}
+require_once(dirname(__FILE__) . '/lib/ristretto255.php');
diff --git a/vendor/paragonie/sodium_compat/build-phar.sh b/vendor/paragonie/sodium_compat/build-phar.sh
new file mode 100644
index 0000000..380eee6
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/build-phar.sh
@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+curl -LSs https://box-project.github.io/box2/installer.php | php
+mkdir ~/box
+mv box.phar ~/box/box
+PATH=$PATH:~/box/ make -C dist/ build-phar
+# PATH=$PATH:~/box/ make -C dist/ sign-phar
+
diff --git a/vendor/paragonie/sodium_compat/composer-php52.json b/vendor/paragonie/sodium_compat/composer-php52.json
new file mode 100644
index 0000000..9547d0d
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/composer-php52.json
@@ -0,0 +1,87 @@
+{
+  "name": "paragonie/sodium_compat",
+  "description": "Pure PHP implementation of libsodium; uses the PHP extension if it exists",
+  "keywords": [
+    "PHP",
+    "cryptography",
+    "elliptic curve",
+    "elliptic curve cryptography",
+    "Pure-PHP cryptography",
+    "side-channel resistant",
+    "Curve25519",
+    "X25519",
+    "ECDH",
+    "Elliptic Curve Diffie-Hellman",
+    "Ed25519",
+    "RFC 7748",
+    "RFC 8032",
+    "EdDSA",
+    "Edwards-curve Digital Signature Algorithm",
+    "ChaCha20",
+    "Salsa20",
+    "Xchacha20",
+    "Xsalsa20",
+    "Poly1305",
+    "BLAKE2b",
+    "public-key cryptography",
+    "secret-key cryptography",
+    "AEAD",
+    "Chapoly",
+    "Salpoly",
+    "ChaCha20-Poly1305",
+    "XSalsa20-Poly1305",
+    "XChaCha20-Poly1305",
+    "encryption",
+    "authentication",
+    "libsodium"
+  ],
+  "license": "ISC",
+  "authors": [
+    {
+      "name": "Paragon Initiative Enterprises",
+      "email": "security@paragonie.com"
+    },
+    {
+      "name": "Frank Denis",
+      "email": "jedisct1@pureftpd.org"
+    }
+  ],
+  "autoload": {
+    "files": ["autoload.php"]
+  },
+  "repositories": [
+    {
+      "type": "git",
+      "url": "https://github.com/garex/phpunit"
+    },
+    {
+      "type": "git",
+      "url": "https://github.com/garex/phpunit-mock-objects"
+    }
+  ],
+  "require": {
+    "php": "^5.2.4|^5.3|^5.4|^5.5|^5.6|^7|^8",
+    "xrstf/composer-php52": "1.*",
+    "paragonie/random_compat": ">=1"
+  },
+  "minimum-stability": "dev",
+  "require-dev": {
+    "phpunit/phpunit-php52": "dev-3.6.12-php52",
+    "phpunit/phpunit-mock-objects-php52": "dev-1.1.0-php52"
+  },
+  "scripts": {
+    "post-install-cmd": [
+      "xrstf\\Composer52\\Generator::onPostInstallCmd"
+    ],
+    "post-update-cmd": [
+      "xrstf\\Composer52\\Generator::onPostInstallCmd"
+    ],
+    "post-autoload-dump": [
+      "xrstf\\Composer52\\Generator::onPostInstallCmd"
+    ]
+  },
+  "suggest": {
+    "ext-libsodium": "PHP < 7.0: Better performance, password hashing (Argon2i), secure memory management (memzero), and better security.",
+    "ext-sodium": "PHP >= 7.0: Better performance, password hashing (Argon2i), secure memory management (memzero), and better security."
+  }
+}
diff --git a/vendor/paragonie/sodium_compat/composer.json b/vendor/paragonie/sodium_compat/composer.json
new file mode 100644
index 0000000..09b9d84
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/composer.json
@@ -0,0 +1,66 @@
+{
+  "name": "paragonie/sodium_compat",
+  "description": "Pure PHP implementation of libsodium; uses the PHP extension if it exists",
+  "keywords": [
+    "PHP",
+    "cryptography",
+    "elliptic curve",
+    "elliptic curve cryptography",
+    "Pure-PHP cryptography",
+    "side-channel resistant",
+    "Curve25519",
+    "X25519",
+    "ECDH",
+    "Elliptic Curve Diffie-Hellman",
+    "Ed25519",
+    "RFC 7748",
+    "RFC 8032",
+    "EdDSA",
+    "Edwards-curve Digital Signature Algorithm",
+    "ChaCha20",
+    "Salsa20",
+    "Xchacha20",
+    "Xsalsa20",
+    "Poly1305",
+    "BLAKE2b",
+    "public-key cryptography",
+    "secret-key cryptography",
+    "AEAD",
+    "Chapoly",
+    "Salpoly",
+    "ChaCha20-Poly1305",
+    "XSalsa20-Poly1305",
+    "XChaCha20-Poly1305",
+    "encryption",
+    "authentication",
+    "libsodium"
+  ],
+  "license": "ISC",
+  "authors": [
+    {
+      "name": "Paragon Initiative Enterprises",
+      "email": "security@paragonie.com"
+    },
+    {
+      "name": "Frank Denis",
+      "email": "jedisct1@pureftpd.org"
+    }
+  ],
+  "autoload": {
+    "files": ["autoload.php"]
+  },
+  "require": {
+    "php": "^5.2.4|^5.3|^5.4|^5.5|^5.6|^7|^8",
+    "paragonie/random_compat": ">=1"
+  },
+  "require-dev": {
+    "phpunit/phpunit": "^3|^4|^5|^6|^7|^8|^9"
+  },
+  "scripts": {
+    "test": "phpunit"
+  },
+  "suggest": {
+    "ext-libsodium": "PHP < 7.0: Better performance, password hashing (Argon2i), secure memory management (memzero), and better security.",
+    "ext-sodium": "PHP >= 7.0: Better performance, password hashing (Argon2i), secure memory management (memzero), and better security."
+  }
+}
diff --git a/vendor/paragonie/sodium_compat/dist/Makefile b/vendor/paragonie/sodium_compat/dist/Makefile
new file mode 100644
index 0000000..f30a25d
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/dist/Makefile
@@ -0,0 +1,39 @@
+# This builds sodium-compat.phar. To run this Makefile, `box` and `composer`
+# must be installed and in your $PATH. Run it from inside the dist/ directory.
+
+box := $(shell which box)
+composer := "composer"
+gitcommit := $(shell git rev-parse HEAD)
+
+.PHONY: all
+all: build-phar
+
+.PHONY: sign-phar
+sign-phar:
+	gpg -u 7F52D5C61D1255C731362E826B97A1C2826404DA --armor --output sodium-compat.phar.sig --detach-sig sodium-compat.phar
+
+# ensure we run in clean tree. export git tree and run there.
+.PHONY: build-phar
+build-phar:
+	@echo "Creating .phar from revision $(shell git rev-parse HEAD)."
+	rm -rf worktree
+	install -d worktree
+	(cd $(CURDIR)/..; git archive HEAD) | tar -x -C worktree
+	$(MAKE) -f $(CURDIR)/Makefile -C worktree sodium-compat.phar
+	mv worktree/*.phar .
+	rm -rf worktree
+
+.PHONY: clean
+clean:
+	rm -vf sodium-compat.phar sodium-compat.phar.sig
+
+# Inside workdir/:
+
+sodium-compat.phar: dist/box.json composer.lock
+	cp dist/box.json .
+	php -d phar.readonly=0 $(box) build -c box.json -v
+
+composer.lock:
+	$(composer) config autoloader-suffix $(gitcommit)
+	$(composer) install --no-dev
+
diff --git a/vendor/paragonie/sodium_compat/dist/box.json b/vendor/paragonie/sodium_compat/dist/box.json
new file mode 100644
index 0000000..5f7827e
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/dist/box.json
@@ -0,0 +1,32 @@
+{
+    "chmod": "0755",
+    "finder": [
+        {
+            "in": "",
+            "name": "autoload.php"
+        },
+        {
+            "in": "src",
+            "name": "*.php"
+        },
+        {
+            "in": "lib",
+            "name": "*.php"
+        },
+        {
+            "in": "vendor/composer",
+            "name": "*.php"
+        },
+        {
+            "in": "vendor/paragonie",
+            "name": "*.php"
+        }
+    ],
+    "compactors": [
+        "Herrera\\Box\\Compactor\\Php"
+    ],
+    "main": "vendor/autoload.php",
+    "output": "sodium-compat.phar",
+    "shebang": false,
+    "stub": true
+}
diff --git a/vendor/paragonie/sodium_compat/lib/constants.php b/vendor/paragonie/sodium_compat/lib/constants.php
new file mode 100644
index 0000000..b6a120e
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/lib/constants.php
@@ -0,0 +1,52 @@
+<?php
+namespace Sodium;
+
+require_once dirname(dirname(__FILE__)) . '/autoload.php';
+
+use ParagonIE_Sodium_Compat;
+
+const CRYPTO_AEAD_AES256GCM_KEYBYTES = ParagonIE_Sodium_Compat::CRYPTO_AEAD_AES256GCM_KEYBYTES;
+const CRYPTO_AEAD_AES256GCM_NSECBYTES = ParagonIE_Sodium_Compat::CRYPTO_AEAD_AES256GCM_NSECBYTES;
+const CRYPTO_AEAD_AES256GCM_NPUBBYTES = ParagonIE_Sodium_Compat::CRYPTO_AEAD_AES256GCM_NPUBBYTES;
+const CRYPTO_AEAD_AES256GCM_ABYTES = ParagonIE_Sodium_Compat::CRYPTO_AEAD_AES256GCM_ABYTES;
+const CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES = ParagonIE_Sodium_Compat::CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES;
+const CRYPTO_AEAD_CHACHA20POLY1305_NSECBYTES = ParagonIE_Sodium_Compat::CRYPTO_AEAD_CHACHA20POLY1305_NSECBYTES;
+const CRYPTO_AEAD_CHACHA20POLY1305_NPUBBYTES = ParagonIE_Sodium_Compat::CRYPTO_AEAD_CHACHA20POLY1305_NPUBBYTES;
+const CRYPTO_AEAD_CHACHA20POLY1305_ABYTES = ParagonIE_Sodium_Compat::CRYPTO_AEAD_CHACHA20POLY1305_ABYTES;
+const CRYPTO_AEAD_CHACHA20POLY1305_IETF_KEYBYTES = ParagonIE_Sodium_Compat::CRYPTO_AEAD_CHACHA20POLY1305_IETF_KEYBYTES;
+const CRYPTO_AEAD_CHACHA20POLY1305_IETF_NSECBYTES = ParagonIE_Sodium_Compat::CRYPTO_AEAD_CHACHA20POLY1305_IETF_NSECBYTES;
+const CRYPTO_AEAD_CHACHA20POLY1305_IETF_NPUBBYTES = ParagonIE_Sodium_Compat::CRYPTO_AEAD_CHACHA20POLY1305_IETF_NPUBBYTES;
+const CRYPTO_AEAD_CHACHA20POLY1305_IETF_ABYTES = ParagonIE_Sodium_Compat::CRYPTO_AEAD_CHACHA20POLY1305_IETF_ABYTES;
+const CRYPTO_AUTH_BYTES = ParagonIE_Sodium_Compat::CRYPTO_AUTH_BYTES;
+const CRYPTO_AUTH_KEYBYTES = ParagonIE_Sodium_Compat::CRYPTO_AUTH_KEYBYTES;
+const CRYPTO_BOX_SEALBYTES = ParagonIE_Sodium_Compat::CRYPTO_BOX_SEALBYTES;
+const CRYPTO_BOX_SECRETKEYBYTES = ParagonIE_Sodium_Compat::CRYPTO_BOX_SECRETKEYBYTES;
+const CRYPTO_BOX_PUBLICKEYBYTES = ParagonIE_Sodium_Compat::CRYPTO_BOX_PUBLICKEYBYTES;
+const CRYPTO_BOX_KEYPAIRBYTES = ParagonIE_Sodium_Compat::CRYPTO_BOX_KEYPAIRBYTES;
+const CRYPTO_BOX_MACBYTES = ParagonIE_Sodium_Compat::CRYPTO_BOX_MACBYTES;
+const CRYPTO_BOX_NONCEBYTES = ParagonIE_Sodium_Compat::CRYPTO_BOX_NONCEBYTES;
+const CRYPTO_BOX_SEEDBYTES = ParagonIE_Sodium_Compat::CRYPTO_BOX_SEEDBYTES;
+const CRYPTO_KX_BYTES = ParagonIE_Sodium_Compat::CRYPTO_KX_BYTES;
+const CRYPTO_KX_SEEDBYTES = ParagonIE_Sodium_Compat::CRYPTO_KX_SEEDBYTES;
+const CRYPTO_KX_PUBLICKEYBYTES = ParagonIE_Sodium_Compat::CRYPTO_KX_PUBLICKEYBYTES;
+const CRYPTO_KX_SECRETKEYBYTES = ParagonIE_Sodium_Compat::CRYPTO_KX_SECRETKEYBYTES;
+const CRYPTO_GENERICHASH_BYTES = ParagonIE_Sodium_Compat::CRYPTO_GENERICHASH_BYTES;
+const CRYPTO_GENERICHASH_BYTES_MIN = ParagonIE_Sodium_Compat::CRYPTO_GENERICHASH_BYTES_MIN;
+const CRYPTO_GENERICHASH_BYTES_MAX = ParagonIE_Sodium_Compat::CRYPTO_GENERICHASH_BYTES_MAX;
+const CRYPTO_GENERICHASH_KEYBYTES = ParagonIE_Sodium_Compat::CRYPTO_GENERICHASH_KEYBYTES;
+const CRYPTO_GENERICHASH_KEYBYTES_MIN = ParagonIE_Sodium_Compat::CRYPTO_GENERICHASH_KEYBYTES_MIN;
+const CRYPTO_GENERICHASH_KEYBYTES_MAX = ParagonIE_Sodium_Compat::CRYPTO_GENERICHASH_KEYBYTES_MAX;
+const CRYPTO_SCALARMULT_BYTES = ParagonIE_Sodium_Compat::CRYPTO_SCALARMULT_BYTES;
+const CRYPTO_SCALARMULT_SCALARBYTES = ParagonIE_Sodium_Compat::CRYPTO_SCALARMULT_SCALARBYTES;
+const CRYPTO_SHORTHASH_BYTES = ParagonIE_Sodium_Compat::CRYPTO_SHORTHASH_BYTES;
+const CRYPTO_SHORTHASH_KEYBYTES = ParagonIE_Sodium_Compat::CRYPTO_SHORTHASH_KEYBYTES;
+const CRYPTO_SECRETBOX_KEYBYTES = ParagonIE_Sodium_Compat::CRYPTO_SECRETBOX_KEYBYTES;
+const CRYPTO_SECRETBOX_MACBYTES = ParagonIE_Sodium_Compat::CRYPTO_SECRETBOX_MACBYTES;
+const CRYPTO_SECRETBOX_NONCEBYTES = ParagonIE_Sodium_Compat::CRYPTO_SECRETBOX_NONCEBYTES;
+const CRYPTO_SIGN_BYTES = ParagonIE_Sodium_Compat::CRYPTO_SIGN_BYTES;
+const CRYPTO_SIGN_SEEDBYTES = ParagonIE_Sodium_Compat::CRYPTO_SIGN_SEEDBYTES;
+const CRYPTO_SIGN_PUBLICKEYBYTES = ParagonIE_Sodium_Compat::CRYPTO_SIGN_PUBLICKEYBYTES;
+const CRYPTO_SIGN_SECRETKEYBYTES = ParagonIE_Sodium_Compat::CRYPTO_SIGN_SECRETKEYBYTES;
+const CRYPTO_SIGN_KEYPAIRBYTES = ParagonIE_Sodium_Compat::CRYPTO_SIGN_KEYPAIRBYTES;
+const CRYPTO_STREAM_KEYBYTES = ParagonIE_Sodium_Compat::CRYPTO_STREAM_KEYBYTES;
+const CRYPTO_STREAM_NONCEBYTES = ParagonIE_Sodium_Compat::CRYPTO_STREAM_NONCEBYTES;
diff --git a/vendor/paragonie/sodium_compat/lib/namespaced.php b/vendor/paragonie/sodium_compat/lib/namespaced.php
new file mode 100644
index 0000000..77551fd
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/lib/namespaced.php
@@ -0,0 +1,48 @@
+<?php
+
+require_once dirname(dirname(__FILE__)) . '/autoload.php';
+
+if (PHP_VERSION_ID < 50300) {
+    return;
+}
+
+/*
+ * This file is just for convenience, to allow developers to reduce verbosity when
+ * they add this project to their libraries.
+ *
+ * Replace this:
+ *
+ * $x = ParagonIE_Sodium_Compat::crypto_aead_xchacha20poly1305_encrypt(...$args);
+ *
+ * with this:
+ *
+ * use ParagonIE\Sodium\Compat;
+ *
+ * $x = Compat::crypto_aead_xchacha20poly1305_encrypt(...$args);
+ */
+spl_autoload_register(function ($class) {
+    if ($class[0] === '\\') {
+        $class = substr($class, 1);
+    }
+    $namespace = 'ParagonIE\\Sodium';
+    // Does the class use the namespace prefix?
+    $len = strlen($namespace);
+    if (strncmp($namespace, $class, $len) !== 0) {
+        // no, move to the next registered autoloader
+        return false;
+    }
+
+    // Get the relative class name
+    $relative_class = substr($class, $len);
+
+    // Replace the namespace prefix with the base directory, replace namespace
+    // separators with directory separators in the relative class name, append
+    // with .php
+    $file = dirname(dirname(__FILE__)) . '/namespaced/' . str_replace('\\', '/', $relative_class) . '.php';
+    // if the file exists, require it
+    if (file_exists($file)) {
+        require_once $file;
+        return true;
+    }
+    return false;
+});
diff --git a/vendor/paragonie/sodium_compat/lib/php72compat.php b/vendor/paragonie/sodium_compat/lib/php72compat.php
new file mode 100644
index 0000000..c2b065f
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/lib/php72compat.php
@@ -0,0 +1,1369 @@
+<?php
+
+require_once dirname(dirname(__FILE__)) . '/autoload.php';
+
+/**
+ * This file will monkey patch the pure-PHP implementation in place of the
+ * PECL functions and constants, but only if they do not already exist.
+ *
+ * Thus, the functions or constants just proxy to the appropriate
+ * ParagonIE_Sodium_Compat method or class constant, respectively.
+ */
+foreach (array(
+    'BASE64_VARIANT_ORIGINAL',
+    'BASE64_VARIANT_ORIGINAL_NO_PADDING',
+    'BASE64_VARIANT_URLSAFE',
+    'BASE64_VARIANT_URLSAFE_NO_PADDING',
+    'CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES',
+    'CRYPTO_AEAD_CHACHA20POLY1305_NSECBYTES',
+    'CRYPTO_AEAD_CHACHA20POLY1305_NPUBBYTES',
+    'CRYPTO_AEAD_CHACHA20POLY1305_ABYTES',
+    'CRYPTO_AEAD_AES256GCM_KEYBYTES',
+    'CRYPTO_AEAD_AES256GCM_NSECBYTES',
+    'CRYPTO_AEAD_AES256GCM_NPUBBYTES',
+    'CRYPTO_AEAD_AES256GCM_ABYTES',
+    'CRYPTO_AEAD_CHACHA20POLY1305_IETF_KEYBYTES',
+    'CRYPTO_AEAD_CHACHA20POLY1305_IETF_NSECBYTES',
+    'CRYPTO_AEAD_CHACHA20POLY1305_IETF_NPUBBYTES',
+    'CRYPTO_AEAD_CHACHA20POLY1305_IETF_ABYTES',
+    'CRYPTO_AEAD_XCHACHA20POLY1305_IETF_KEYBYTES',
+    'CRYPTO_AEAD_XCHACHA20POLY1305_IETF_NSECBYTES',
+    'CRYPTO_AEAD_XCHACHA20POLY1305_IETF_NPUBBYTES',
+    'CRYPTO_AEAD_XCHACHA20POLY1305_IETF_ABYTES',
+    'CRYPTO_AUTH_BYTES',
+    'CRYPTO_AUTH_KEYBYTES',
+    'CRYPTO_BOX_SEALBYTES',
+    'CRYPTO_BOX_SECRETKEYBYTES',
+    'CRYPTO_BOX_PUBLICKEYBYTES',
+    'CRYPTO_BOX_KEYPAIRBYTES',
+    'CRYPTO_BOX_MACBYTES',
+    'CRYPTO_BOX_NONCEBYTES',
+    'CRYPTO_BOX_SEEDBYTES',
+    'CRYPTO_KDF_BYTES_MIN',
+    'CRYPTO_KDF_BYTES_MAX',
+    'CRYPTO_KDF_CONTEXTBYTES',
+    'CRYPTO_KDF_KEYBYTES',
+    'CRYPTO_KX_BYTES',
+    'CRYPTO_KX_KEYPAIRBYTES',
+    'CRYPTO_KX_PRIMITIVE',
+    'CRYPTO_KX_SEEDBYTES',
+    'CRYPTO_KX_PUBLICKEYBYTES',
+    'CRYPTO_KX_SECRETKEYBYTES',
+    'CRYPTO_KX_SESSIONKEYBYTES',
+    'CRYPTO_GENERICHASH_BYTES',
+    'CRYPTO_GENERICHASH_BYTES_MIN',
+    'CRYPTO_GENERICHASH_BYTES_MAX',
+    'CRYPTO_GENERICHASH_KEYBYTES',
+    'CRYPTO_GENERICHASH_KEYBYTES_MIN',
+    'CRYPTO_GENERICHASH_KEYBYTES_MAX',
+    'CRYPTO_PWHASH_SALTBYTES',
+    'CRYPTO_PWHASH_STRPREFIX',
+    'CRYPTO_PWHASH_ALG_ARGON2I13',
+    'CRYPTO_PWHASH_ALG_ARGON2ID13',
+    'CRYPTO_PWHASH_MEMLIMIT_INTERACTIVE',
+    'CRYPTO_PWHASH_OPSLIMIT_INTERACTIVE',
+    'CRYPTO_PWHASH_MEMLIMIT_MODERATE',
+    'CRYPTO_PWHASH_OPSLIMIT_MODERATE',
+    'CRYPTO_PWHASH_MEMLIMIT_SENSITIVE',
+    'CRYPTO_PWHASH_OPSLIMIT_SENSITIVE',
+    'CRYPTO_PWHASH_SCRYPTSALSA208SHA256_SALTBYTES',
+    'CRYPTO_PWHASH_SCRYPTSALSA208SHA256_STRPREFIX',
+    'CRYPTO_PWHASH_SCRYPTSALSA208SHA256_MEMLIMIT_INTERACTIVE',
+    'CRYPTO_PWHASH_SCRYPTSALSA208SHA256_OPSLIMIT_INTERACTIVE',
+    'CRYPTO_PWHASH_SCRYPTSALSA208SHA256_MEMLIMIT_SENSITIVE',
+    'CRYPTO_PWHASH_SCRYPTSALSA208SHA256_OPSLIMIT_SENSITIVE',
+    'CRYPTO_SCALARMULT_BYTES',
+    'CRYPTO_SCALARMULT_SCALARBYTES',
+    'CRYPTO_SHORTHASH_BYTES',
+    'CRYPTO_SHORTHASH_KEYBYTES',
+    'CRYPTO_SECRETBOX_KEYBYTES',
+    'CRYPTO_SECRETBOX_MACBYTES',
+    'CRYPTO_SECRETBOX_NONCEBYTES',
+    'CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_ABYTES',
+    'CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_HEADERBYTES',
+    'CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_KEYBYTES',
+    'CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_TAG_PUSH',
+    'CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_TAG_PULL',
+    'CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_TAG_REKEY',
+    'CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_TAG_FINAL',
+    'CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_MESSAGEBYTES_MAX',
+    'CRYPTO_SIGN_BYTES',
+    'CRYPTO_SIGN_SEEDBYTES',
+    'CRYPTO_SIGN_PUBLICKEYBYTES',
+    'CRYPTO_SIGN_SECRETKEYBYTES',
+    'CRYPTO_SIGN_KEYPAIRBYTES',
+    'CRYPTO_STREAM_KEYBYTES',
+    'CRYPTO_STREAM_NONCEBYTES',
+    'CRYPTO_STREAM_XCHACHA20_KEYBYTES',
+    'CRYPTO_STREAM_XCHACHA20_NONCEBYTES',
+    'LIBRARY_MAJOR_VERSION',
+    'LIBRARY_MINOR_VERSION',
+    'LIBRARY_VERSION_MAJOR',
+    'LIBRARY_VERSION_MINOR',
+    'VERSION_STRING'
+    ) as $constant
+) {
+    if (!defined("SODIUM_$constant") && defined("ParagonIE_Sodium_Compat::$constant")) {
+        define("SODIUM_$constant", constant("ParagonIE_Sodium_Compat::$constant"));
+    }
+}
+if (!is_callable('sodium_add')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::add()
+     * @param string $val
+     * @param string $addv
+     * @return void
+     * @throws SodiumException
+     */
+    function sodium_add(&$val, $addv)
+    {
+        ParagonIE_Sodium_Compat::add($val, $addv);
+    }
+}
+if (!is_callable('sodium_base642bin')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::bin2base64()
+     * @param string $string
+     * @param int $variant
+     * @param string $ignore
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_base642bin($string, $variant, $ignore ='')
+    {
+        return ParagonIE_Sodium_Compat::base642bin($string, $variant, $ignore);
+    }
+}
+if (!is_callable('sodium_bin2base64')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::bin2base64()
+     * @param string $string
+     * @param int $variant
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_bin2base64($string, $variant)
+    {
+        return ParagonIE_Sodium_Compat::bin2base64($string, $variant);
+    }
+}
+if (!is_callable('sodium_bin2hex')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::hex2bin()
+     * @param string $string
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_bin2hex($string)
+    {
+        return ParagonIE_Sodium_Compat::bin2hex($string);
+    }
+}
+if (!is_callable('sodium_compare')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::compare()
+     * @param string $a
+     * @param string $b
+     * @return int
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_compare($a, $b)
+    {
+        return ParagonIE_Sodium_Compat::compare($a, $b);
+    }
+}
+if (!is_callable('sodium_crypto_aead_aes256gcm_decrypt')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_aead_aes256gcm_decrypt()
+     * @param string $message
+     * @param string $assocData
+     * @param string $nonce
+     * @param string $key
+     * @return string|bool
+     */
+    function sodium_crypto_aead_aes256gcm_decrypt($message, $assocData, $nonce, $key)
+    {
+        try {
+            return ParagonIE_Sodium_Compat::crypto_aead_aes256gcm_decrypt($message, $assocData, $nonce, $key);
+        } catch (Error $ex) {
+            return false;
+        } catch (Exception $ex) {
+            return false;
+        }
+    }
+}
+if (!is_callable('sodium_crypto_aead_aes256gcm_encrypt')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_aead_aes256gcm_encrypt()
+     * @param string $message
+     * @param string $assocData
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_aead_aes256gcm_encrypt($message, $assocData, $nonce, $key)
+    {
+        return ParagonIE_Sodium_Compat::crypto_aead_aes256gcm_encrypt($message, $assocData, $nonce, $key);
+    }
+}
+if (!is_callable('sodium_crypto_aead_aes256gcm_is_available')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_aead_aes256gcm_is_available()
+     * @return bool
+     */
+    function sodium_crypto_aead_aes256gcm_is_available()
+    {
+        return ParagonIE_Sodium_Compat::crypto_aead_aes256gcm_is_available();
+    }
+}
+if (!is_callable('sodium_crypto_aead_chacha20poly1305_decrypt')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_aead_chacha20poly1305_decrypt()
+     * @param string $message
+     * @param string $assocData
+     * @param string $nonce
+     * @param string $key
+     * @return string|bool
+     */
+    function sodium_crypto_aead_chacha20poly1305_decrypt($message, $assocData, $nonce, $key)
+    {
+        try {
+            return ParagonIE_Sodium_Compat::crypto_aead_chacha20poly1305_decrypt($message, $assocData, $nonce, $key);
+        } catch (Error $ex) {
+            return false;
+        } catch (Exception $ex) {
+            return false;
+        }
+    }
+}
+if (!is_callable('sodium_crypto_aead_chacha20poly1305_encrypt')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_aead_chacha20poly1305_encrypt()
+     * @param string $message
+     * @param string $assocData
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_aead_chacha20poly1305_encrypt($message, $assocData, $nonce, $key)
+    {
+        return ParagonIE_Sodium_Compat::crypto_aead_chacha20poly1305_encrypt($message, $assocData, $nonce, $key);
+    }
+}
+if (!is_callable('sodium_crypto_aead_chacha20poly1305_keygen')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_aead_chacha20poly1305_keygen()
+     * @return string
+     * @throws Exception
+     */
+    function sodium_crypto_aead_chacha20poly1305_keygen()
+    {
+        return ParagonIE_Sodium_Compat::crypto_aead_chacha20poly1305_keygen();
+    }
+}
+if (!is_callable('sodium_crypto_aead_chacha20poly1305_ietf_decrypt')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_aead_chacha20poly1305_ietf_decrypt()
+     * @param string $message
+     * @param string $assocData
+     * @param string $nonce
+     * @param string $key
+     * @return string|bool
+     */
+    function sodium_crypto_aead_chacha20poly1305_ietf_decrypt($message, $assocData, $nonce, $key)
+    {
+        try {
+            return ParagonIE_Sodium_Compat::crypto_aead_chacha20poly1305_ietf_decrypt($message, $assocData, $nonce, $key);
+        } catch (Error $ex) {
+            return false;
+        } catch (Exception $ex) {
+            return false;
+        }
+    }
+}
+if (!is_callable('sodium_crypto_aead_chacha20poly1305_ietf_encrypt')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_aead_chacha20poly1305_ietf_encrypt()
+     * @param string $message
+     * @param string $assocData
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_aead_chacha20poly1305_ietf_encrypt($message, $assocData, $nonce, $key)
+    {
+        return ParagonIE_Sodium_Compat::crypto_aead_chacha20poly1305_ietf_encrypt($message, $assocData, $nonce, $key);
+    }
+}
+if (!is_callable('sodium_crypto_aead_chacha20poly1305_ietf_keygen')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_aead_chacha20poly1305_ietf_keygen()
+     * @return string
+     * @throws Exception
+     */
+    function sodium_crypto_aead_chacha20poly1305_ietf_keygen()
+    {
+        return ParagonIE_Sodium_Compat::crypto_aead_chacha20poly1305_ietf_keygen();
+    }
+}
+if (!is_callable('sodium_crypto_aead_xchacha20poly1305_ietf_decrypt')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_aead_xchacha20poly1305_ietf_decrypt()
+     * @param string $message
+     * @param string $assocData
+     * @param string $nonce
+     * @param string $key
+     * @return string|bool
+     */
+    function sodium_crypto_aead_xchacha20poly1305_ietf_decrypt($message, $assocData, $nonce, $key)
+    {
+        try {
+            return ParagonIE_Sodium_Compat::crypto_aead_xchacha20poly1305_ietf_decrypt($message, $assocData, $nonce, $key, true);
+        } catch (Error $ex) {
+            return false;
+        } catch (Exception $ex) {
+            return false;
+        }
+    }
+}
+if (!is_callable('sodium_crypto_aead_xchacha20poly1305_ietf_encrypt')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_aead_xchacha20poly1305_ietf_encrypt()
+     * @param string $message
+     * @param string $assocData
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_aead_xchacha20poly1305_ietf_encrypt($message, $assocData, $nonce, $key)
+    {
+        return ParagonIE_Sodium_Compat::crypto_aead_xchacha20poly1305_ietf_encrypt($message, $assocData, $nonce, $key, true);
+    }
+}
+if (!is_callable('sodium_crypto_aead_xchacha20poly1305_ietf_keygen')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_aead_xchacha20poly1305_ietf_keygen()
+     * @return string
+     * @throws Exception
+     */
+    function sodium_crypto_aead_xchacha20poly1305_ietf_keygen()
+    {
+        return ParagonIE_Sodium_Compat::crypto_aead_xchacha20poly1305_ietf_keygen();
+    }
+}
+if (!is_callable('sodium_crypto_auth')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_auth()
+     * @param string $message
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_auth($message, $key)
+    {
+        return ParagonIE_Sodium_Compat::crypto_auth($message, $key);
+    }
+}
+if (!is_callable('sodium_crypto_auth_keygen')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_auth_keygen()
+     * @return string
+     * @throws Exception
+     */
+    function sodium_crypto_auth_keygen()
+    {
+        return ParagonIE_Sodium_Compat::crypto_auth_keygen();
+    }
+}
+if (!is_callable('sodium_crypto_auth_verify')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_auth_verify()
+     * @param string $mac
+     * @param string $message
+     * @param string $key
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_auth_verify($mac, $message, $key)
+    {
+        return ParagonIE_Sodium_Compat::crypto_auth_verify($mac, $message, $key);
+    }
+}
+if (!is_callable('sodium_crypto_box')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_box()
+     * @param string $message
+     * @param string $nonce
+     * @param string $kp
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_box($message, $nonce, $kp)
+    {
+        return ParagonIE_Sodium_Compat::crypto_box($message, $nonce, $kp);
+    }
+}
+if (!is_callable('sodium_crypto_box_keypair')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_box_keypair()
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_box_keypair()
+    {
+        return ParagonIE_Sodium_Compat::crypto_box_keypair();
+    }
+}
+if (!is_callable('sodium_crypto_box_keypair_from_secretkey_and_publickey')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_box_keypair_from_secretkey_and_publickey()
+     * @param string $sk
+     * @param string $pk
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_box_keypair_from_secretkey_and_publickey($sk, $pk)
+    {
+        return ParagonIE_Sodium_Compat::crypto_box_keypair_from_secretkey_and_publickey($sk, $pk);
+    }
+}
+if (!is_callable('sodium_crypto_box_open')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_box_open()
+     * @param string $message
+     * @param string $nonce
+     * @param string $kp
+     * @return string|bool
+     */
+    function sodium_crypto_box_open($message, $nonce, $kp)
+    {
+        try {
+            return ParagonIE_Sodium_Compat::crypto_box_open($message, $nonce, $kp);
+        } catch (Error $ex) {
+            return false;
+        } catch (Exception $ex) {
+            return false;
+        }
+    }
+}
+if (!is_callable('sodium_crypto_box_publickey')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_box_publickey()
+     * @param string $keypair
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_box_publickey($keypair)
+    {
+        return ParagonIE_Sodium_Compat::crypto_box_publickey($keypair);
+    }
+}
+if (!is_callable('sodium_crypto_box_publickey_from_secretkey')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_box_publickey_from_secretkey()
+     * @param string $sk
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_box_publickey_from_secretkey($sk)
+    {
+        return ParagonIE_Sodium_Compat::crypto_box_publickey_from_secretkey($sk);
+    }
+}
+if (!is_callable('sodium_crypto_box_seal')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_box_seal()
+     * @param string $message
+     * @param string $publicKey
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_box_seal($message, $publicKey)
+    {
+        return ParagonIE_Sodium_Compat::crypto_box_seal($message, $publicKey);
+    }
+}
+if (!is_callable('sodium_crypto_box_seal_open')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_box_seal_open()
+     * @param string $message
+     * @param string $kp
+     * @return string|bool
+     * @throws SodiumException
+     */
+    function sodium_crypto_box_seal_open($message, $kp)
+    {
+        try {
+            return ParagonIE_Sodium_Compat::crypto_box_seal_open($message, $kp);
+        } catch (SodiumException $ex) {
+            if ($ex->getMessage() === 'Argument 2 must be CRYPTO_BOX_KEYPAIRBYTES long.') {
+                throw $ex;
+            }
+            return false;
+        }
+    }
+}
+if (!is_callable('sodium_crypto_box_secretkey')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_box_secretkey()
+     * @param string $keypair
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_box_secretkey($keypair)
+    {
+        return ParagonIE_Sodium_Compat::crypto_box_secretkey($keypair);
+    }
+}
+if (!is_callable('sodium_crypto_box_seed_keypair')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_box_seed_keypair()
+     * @param string $seed
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_box_seed_keypair($seed)
+    {
+        return ParagonIE_Sodium_Compat::crypto_box_seed_keypair($seed);
+    }
+}
+if (!is_callable('sodium_crypto_generichash')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_generichash()
+     * @param string $message
+     * @param string|null $key
+     * @param int $outLen
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_generichash($message, $key = null, $outLen = 32)
+    {
+        return ParagonIE_Sodium_Compat::crypto_generichash($message, $key, $outLen);
+    }
+}
+if (!is_callable('sodium_crypto_generichash_final')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_generichash_final()
+     * @param string|null $ctx
+     * @param int $outputLength
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_generichash_final(&$ctx, $outputLength = 32)
+    {
+        return ParagonIE_Sodium_Compat::crypto_generichash_final($ctx, $outputLength);
+    }
+}
+if (!is_callable('sodium_crypto_generichash_init')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_generichash_init()
+     * @param string|null $key
+     * @param int $outLen
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_generichash_init($key = null, $outLen = 32)
+    {
+        return ParagonIE_Sodium_Compat::crypto_generichash_init($key, $outLen);
+    }
+}
+if (!is_callable('sodium_crypto_generichash_keygen')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_generichash_keygen()
+     * @return string
+     * @throws Exception
+     */
+    function sodium_crypto_generichash_keygen()
+    {
+        return ParagonIE_Sodium_Compat::crypto_generichash_keygen();
+    }
+}
+if (!is_callable('sodium_crypto_generichash_update')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_generichash_update()
+     * @param string|null $ctx
+     * @param string $message
+     * @return void
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_generichash_update(&$ctx, $message = '')
+    {
+        ParagonIE_Sodium_Compat::crypto_generichash_update($ctx, $message);
+    }
+}
+if (!is_callable('sodium_crypto_kdf_keygen')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_kdf_keygen()
+     * @return string
+     * @throws Exception
+     */
+    function sodium_crypto_kdf_keygen()
+    {
+        return ParagonIE_Sodium_Compat::crypto_kdf_keygen();
+    }
+}
+if (!is_callable('sodium_crypto_kdf_derive_from_key')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_kdf_derive_from_key()
+     * @param int $subkey_len
+     * @param int $subkey_id
+     * @param string $context
+     * @param string $key
+     * @return string
+     * @throws Exception
+     */
+    function sodium_crypto_kdf_derive_from_key($subkey_len, $subkey_id, $context, $key)
+    {
+        return ParagonIE_Sodium_Compat::crypto_kdf_derive_from_key(
+            $subkey_len,
+            $subkey_id,
+            $context,
+            $key
+        );
+    }
+}
+if (!is_callable('sodium_crypto_kx')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_kx()
+     * @param string $my_secret
+     * @param string $their_public
+     * @param string $client_public
+     * @param string $server_public
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_kx($my_secret, $their_public, $client_public, $server_public)
+    {
+        return ParagonIE_Sodium_Compat::crypto_kx(
+            $my_secret,
+            $their_public,
+            $client_public,
+            $server_public
+        );
+    }
+}
+if (!is_callable('sodium_crypto_kx_seed_keypair')) {
+    /**
+     * @param string $seed
+     * @return string
+     * @throws Exception
+     */
+    function sodium_crypto_kx_seed_keypair($seed)
+    {
+        return ParagonIE_Sodium_Compat::crypto_kx_seed_keypair($seed);
+    }
+}
+if (!is_callable('sodium_crypto_kx_keypair')) {
+    /**
+     * @return string
+     * @throws Exception
+     */
+    function sodium_crypto_kx_keypair()
+    {
+        return ParagonIE_Sodium_Compat::crypto_kx_keypair();
+    }
+}
+if (!is_callable('sodium_crypto_kx_client_session_keys')) {
+    /**
+     * @param string $keypair
+     * @param string $serverPublicKey
+     * @return array{0: string, 1: string}
+     * @throws SodiumException
+     */
+    function sodium_crypto_kx_client_session_keys($keypair, $serverPublicKey)
+    {
+        return ParagonIE_Sodium_Compat::crypto_kx_client_session_keys($keypair, $serverPublicKey);
+    }
+}
+if (!is_callable('sodium_crypto_kx_server_session_keys')) {
+    /**
+     * @param string $keypair
+     * @param string $clientPublicKey
+     * @return array{0: string, 1: string}
+     * @throws SodiumException
+     */
+    function sodium_crypto_kx_server_session_keys($keypair, $clientPublicKey)
+    {
+        return ParagonIE_Sodium_Compat::crypto_kx_server_session_keys($keypair, $clientPublicKey);
+    }
+}
+if (!is_callable('sodium_crypto_kx_secretkey')) {
+    /**
+     * @param string $keypair
+     * @return string
+     * @throws Exception
+     */
+    function sodium_crypto_kx_secretkey($keypair)
+    {
+        return ParagonIE_Sodium_Compat::crypto_kx_secretkey($keypair);
+    }
+}
+if (!is_callable('sodium_crypto_kx_publickey')) {
+    /**
+     * @param string $keypair
+     * @return string
+     * @throws Exception
+     */
+    function sodium_crypto_kx_publickey($keypair)
+    {
+        return ParagonIE_Sodium_Compat::crypto_kx_publickey($keypair);
+    }
+}
+if (!is_callable('sodium_crypto_pwhash')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_pwhash()
+     * @param int $outlen
+     * @param string $passwd
+     * @param string $salt
+     * @param int $opslimit
+     * @param int $memlimit
+     * @param int|null $algo
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_pwhash($outlen, $passwd, $salt, $opslimit, $memlimit, $algo = null)
+    {
+        return ParagonIE_Sodium_Compat::crypto_pwhash($outlen, $passwd, $salt, $opslimit, $memlimit, $algo);
+    }
+}
+if (!is_callable('sodium_crypto_pwhash_str')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_pwhash_str()
+     * @param string $passwd
+     * @param int $opslimit
+     * @param int $memlimit
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_pwhash_str($passwd, $opslimit, $memlimit)
+    {
+        return ParagonIE_Sodium_Compat::crypto_pwhash_str($passwd, $opslimit, $memlimit);
+    }
+}
+if (!is_callable('sodium_crypto_pwhash_str_needs_rehash')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_pwhash_str_needs_rehash()
+     * @param string $hash
+     * @param int $opslimit
+     * @param int $memlimit
+     * @return bool
+     *
+     * @throws SodiumException
+     */
+    function sodium_crypto_pwhash_str_needs_rehash($hash, $opslimit, $memlimit)
+    {
+        return ParagonIE_Sodium_Compat::crypto_pwhash_str_needs_rehash($hash, $opslimit, $memlimit);
+    }
+}
+if (!is_callable('sodium_crypto_pwhash_str_verify')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_pwhash_str_verify()
+     * @param string $passwd
+     * @param string $hash
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_pwhash_str_verify($passwd, $hash)
+    {
+        return ParagonIE_Sodium_Compat::crypto_pwhash_str_verify($passwd, $hash);
+    }
+}
+if (!is_callable('sodium_crypto_pwhash_scryptsalsa208sha256')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_pwhash_scryptsalsa208sha256()
+     * @param int $outlen
+     * @param string $passwd
+     * @param string $salt
+     * @param int $opslimit
+     * @param int $memlimit
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_pwhash_scryptsalsa208sha256($outlen, $passwd, $salt, $opslimit, $memlimit)
+    {
+        return ParagonIE_Sodium_Compat::crypto_pwhash_scryptsalsa208sha256($outlen, $passwd, $salt, $opslimit, $memlimit);
+    }
+}
+if (!is_callable('sodium_crypto_pwhash_scryptsalsa208sha256_str')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_pwhash_scryptsalsa208sha256_str()
+     * @param string $passwd
+     * @param int $opslimit
+     * @param int $memlimit
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_pwhash_scryptsalsa208sha256_str($passwd, $opslimit, $memlimit)
+    {
+        return ParagonIE_Sodium_Compat::crypto_pwhash_scryptsalsa208sha256_str($passwd, $opslimit, $memlimit);
+    }
+}
+if (!is_callable('sodium_crypto_pwhash_scryptsalsa208sha256_str_verify')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_pwhash_scryptsalsa208sha256_str_verify()
+     * @param string $passwd
+     * @param string $hash
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_pwhash_scryptsalsa208sha256_str_verify($passwd, $hash)
+    {
+        return ParagonIE_Sodium_Compat::crypto_pwhash_scryptsalsa208sha256_str_verify($passwd, $hash);
+    }
+}
+if (!is_callable('sodium_crypto_scalarmult')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_scalarmult()
+     * @param string $n
+     * @param string $p
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_scalarmult($n, $p)
+    {
+        return ParagonIE_Sodium_Compat::crypto_scalarmult($n, $p);
+    }
+}
+if (!is_callable('sodium_crypto_scalarmult_base')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_scalarmult_base()
+     * @param string $n
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_scalarmult_base($n)
+    {
+        return ParagonIE_Sodium_Compat::crypto_scalarmult_base($n);
+    }
+}
+if (!is_callable('sodium_crypto_secretbox')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_secretbox()
+     * @param string $message
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_secretbox($message, $nonce, $key)
+    {
+        return ParagonIE_Sodium_Compat::crypto_secretbox($message, $nonce, $key);
+    }
+}
+if (!is_callable('sodium_crypto_secretbox_keygen')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_secretbox_keygen()
+     * @return string
+     * @throws Exception
+     */
+    function sodium_crypto_secretbox_keygen()
+    {
+        return ParagonIE_Sodium_Compat::crypto_secretbox_keygen();
+    }
+}
+if (!is_callable('sodium_crypto_secretbox_open')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_secretbox_open()
+     * @param string $message
+     * @param string $nonce
+     * @param string $key
+     * @return string|bool
+     */
+    function sodium_crypto_secretbox_open($message, $nonce, $key)
+    {
+        try {
+            return ParagonIE_Sodium_Compat::crypto_secretbox_open($message, $nonce, $key);
+        } catch (Error $ex) {
+            return false;
+        } catch (Exception $ex) {
+            return false;
+        }
+    }
+}
+if (!is_callable('sodium_crypto_secretstream_xchacha20poly1305_init_push')) {
+    /**
+     * @param string $key
+     * @return array<int, string>
+     * @throws SodiumException
+     */
+    function sodium_crypto_secretstream_xchacha20poly1305_init_push($key)
+    {
+        return ParagonIE_Sodium_Compat::crypto_secretstream_xchacha20poly1305_init_push($key);
+    }
+}
+if (!is_callable('sodium_crypto_secretstream_xchacha20poly1305_push')) {
+    /**
+     * @param string $state
+     * @param string $msg
+     * @param string $aad
+     * @param int $tag
+     * @return string
+     * @throws SodiumException
+     */
+    function sodium_crypto_secretstream_xchacha20poly1305_push(&$state, $msg, $aad = '', $tag = 0)
+    {
+        return ParagonIE_Sodium_Compat::crypto_secretstream_xchacha20poly1305_push($state, $msg, $aad, $tag);
+    }
+}
+if (!is_callable('sodium_crypto_secretstream_xchacha20poly1305_init_pull')) {
+    /**
+     * @param string $header
+     * @param string $key
+     * @return string
+     * @throws Exception
+     */
+    function sodium_crypto_secretstream_xchacha20poly1305_init_pull($header, $key)
+    {
+        return ParagonIE_Sodium_Compat::crypto_secretstream_xchacha20poly1305_init_pull($header, $key);
+    }
+}
+if (!is_callable('sodium_crypto_secretstream_xchacha20poly1305_pull')) {
+    /**
+     * @param string $state
+     * @param string $cipher
+     * @param string $aad
+     * @return bool|array{0: string, 1: int}
+     * @throws SodiumException
+     */
+    function sodium_crypto_secretstream_xchacha20poly1305_pull(&$state, $cipher, $aad = '')
+    {
+        return ParagonIE_Sodium_Compat::crypto_secretstream_xchacha20poly1305_pull($state, $cipher, $aad);
+    }
+}
+if (!is_callable('sodium_crypto_secretstream_xchacha20poly1305_rekey')) {
+    /**
+     * @param string $state
+     * @return void
+     * @throws SodiumException
+     */
+    function sodium_crypto_secretstream_xchacha20poly1305_rekey(&$state)
+    {
+        ParagonIE_Sodium_Compat::crypto_secretstream_xchacha20poly1305_rekey($state);
+    }
+}
+if (!is_callable('sodium_crypto_secretstream_xchacha20poly1305_keygen')) {
+    /**
+     * @return string
+     * @throws Exception
+     */
+    function sodium_crypto_secretstream_xchacha20poly1305_keygen()
+    {
+        return ParagonIE_Sodium_Compat::crypto_secretstream_xchacha20poly1305_keygen();
+    }
+}
+if (!is_callable('sodium_crypto_shorthash')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_shorthash()
+     * @param string $message
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_shorthash($message, $key = '')
+    {
+        return ParagonIE_Sodium_Compat::crypto_shorthash($message, $key);
+    }
+}
+if (!is_callable('sodium_crypto_shorthash_keygen')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_shorthash_keygen()
+     * @return string
+     * @throws Exception
+     */
+    function sodium_crypto_shorthash_keygen()
+    {
+        return ParagonIE_Sodium_Compat::crypto_shorthash_keygen();
+    }
+}
+if (!is_callable('sodium_crypto_sign')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_sign()
+     * @param string $message
+     * @param string $sk
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_sign($message, $sk)
+    {
+        return ParagonIE_Sodium_Compat::crypto_sign($message, $sk);
+    }
+}
+if (!is_callable('sodium_crypto_sign_detached')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_sign_detached()
+     * @param string $message
+     * @param string $sk
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_sign_detached($message, $sk)
+    {
+        return ParagonIE_Sodium_Compat::crypto_sign_detached($message, $sk);
+    }
+}
+if (!is_callable('sodium_crypto_sign_keypair_from_secretkey_and_publickey')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_sign_keypair_from_secretkey_and_publickey()
+     * @param string $sk
+     * @param string $pk
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_sign_keypair_from_secretkey_and_publickey($sk, $pk)
+    {
+        return ParagonIE_Sodium_Compat::crypto_sign_keypair_from_secretkey_and_publickey($sk, $pk);
+    }
+}
+if (!is_callable('sodium_crypto_sign_keypair')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_sign_keypair()
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_sign_keypair()
+    {
+        return ParagonIE_Sodium_Compat::crypto_sign_keypair();
+    }
+}
+if (!is_callable('sodium_crypto_sign_open')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_sign_open()
+     * @param string $signedMessage
+     * @param string $pk
+     * @return string|bool
+     */
+    function sodium_crypto_sign_open($signedMessage, $pk)
+    {
+        try {
+            return ParagonIE_Sodium_Compat::crypto_sign_open($signedMessage, $pk);
+        } catch (Error $ex) {
+            return false;
+        } catch (Exception $ex) {
+            return false;
+        }
+    }
+}
+if (!is_callable('sodium_crypto_sign_publickey')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_sign_publickey()
+     * @param string $keypair
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_sign_publickey($keypair)
+    {
+        return ParagonIE_Sodium_Compat::crypto_sign_publickey($keypair);
+    }
+}
+if (!is_callable('sodium_crypto_sign_publickey_from_secretkey')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_sign_publickey_from_secretkey()
+     * @param string $sk
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_sign_publickey_from_secretkey($sk)
+    {
+        return ParagonIE_Sodium_Compat::crypto_sign_publickey_from_secretkey($sk);
+    }
+}
+if (!is_callable('sodium_crypto_sign_secretkey')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_sign_secretkey()
+     * @param string $keypair
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_sign_secretkey($keypair)
+    {
+        return ParagonIE_Sodium_Compat::crypto_sign_secretkey($keypair);
+    }
+}
+if (!is_callable('sodium_crypto_sign_seed_keypair')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_sign_seed_keypair()
+     * @param string $seed
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_sign_seed_keypair($seed)
+    {
+        return ParagonIE_Sodium_Compat::crypto_sign_seed_keypair($seed);
+    }
+}
+if (!is_callable('sodium_crypto_sign_verify_detached')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_sign_verify_detached()
+     * @param string $signature
+     * @param string $message
+     * @param string $pk
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_sign_verify_detached($signature, $message, $pk)
+    {
+        return ParagonIE_Sodium_Compat::crypto_sign_verify_detached($signature, $message, $pk);
+    }
+}
+if (!is_callable('sodium_crypto_sign_ed25519_pk_to_curve25519')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_sign_ed25519_pk_to_curve25519()
+     * @param string $pk
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_sign_ed25519_pk_to_curve25519($pk)
+    {
+        return ParagonIE_Sodium_Compat::crypto_sign_ed25519_pk_to_curve25519($pk);
+    }
+}
+if (!is_callable('sodium_crypto_sign_ed25519_sk_to_curve25519')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_sign_ed25519_sk_to_curve25519()
+     * @param string $sk
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_sign_ed25519_sk_to_curve25519($sk)
+    {
+        return ParagonIE_Sodium_Compat::crypto_sign_ed25519_sk_to_curve25519($sk);
+    }
+}
+if (!is_callable('sodium_crypto_stream')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_stream()
+     * @param int $len
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_stream($len, $nonce, $key)
+    {
+        return ParagonIE_Sodium_Compat::crypto_stream($len, $nonce, $key);
+    }
+}
+if (!is_callable('sodium_crypto_stream_keygen')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_stream_keygen()
+     * @return string
+     * @throws Exception
+     */
+    function sodium_crypto_stream_keygen()
+    {
+        return ParagonIE_Sodium_Compat::crypto_stream_keygen();
+    }
+}
+if (!is_callable('sodium_crypto_stream_xor')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_stream_xor()
+     * @param string $message
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_stream_xor($message, $nonce, $key)
+    {
+        return ParagonIE_Sodium_Compat::crypto_stream_xor($message, $nonce, $key);
+    }
+}
+require_once dirname(__FILE__) . '/stream-xchacha20.php';
+if (!is_callable('sodium_hex2bin')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::hex2bin()
+     * @param string $string
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_hex2bin($string)
+    {
+        return ParagonIE_Sodium_Compat::hex2bin($string);
+    }
+}
+if (!is_callable('sodium_increment')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::increment()
+     * @param string $string
+     * @return void
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_increment(&$string)
+    {
+        ParagonIE_Sodium_Compat::increment($string);
+    }
+}
+if (!is_callable('sodium_library_version_major')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::library_version_major()
+     * @return int
+     */
+    function sodium_library_version_major()
+    {
+        return ParagonIE_Sodium_Compat::library_version_major();
+    }
+}
+if (!is_callable('sodium_library_version_minor')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::library_version_minor()
+     * @return int
+     */
+    function sodium_library_version_minor()
+    {
+        return ParagonIE_Sodium_Compat::library_version_minor();
+    }
+}
+if (!is_callable('sodium_version_string')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::version_string()
+     * @return string
+     */
+    function sodium_version_string()
+    {
+        return ParagonIE_Sodium_Compat::version_string();
+    }
+}
+if (!is_callable('sodium_memcmp')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::memcmp()
+     * @param string $a
+     * @param string $b
+     * @return int
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_memcmp($a, $b)
+    {
+        return ParagonIE_Sodium_Compat::memcmp($a, $b);
+    }
+}
+if (!is_callable('sodium_memzero')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::memzero()
+     * @param string $str
+     * @return void
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_memzero(&$str)
+    {
+        ParagonIE_Sodium_Compat::memzero($str);
+    }
+}
+if (!is_callable('sodium_pad')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::pad()
+     * @param string $unpadded
+     * @param int $blockSize
+     * @return int
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_pad($unpadded, $blockSize)
+    {
+        return ParagonIE_Sodium_Compat::pad($unpadded, $blockSize, true);
+    }
+}
+if (!is_callable('sodium_unpad')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::pad()
+     * @param string $padded
+     * @param int $blockSize
+     * @return int
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_unpad($padded, $blockSize)
+    {
+        return ParagonIE_Sodium_Compat::unpad($padded, $blockSize, true);
+    }
+}
+if (!is_callable('sodium_randombytes_buf')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::randombytes_buf()
+     * @param int $amount
+     * @return string
+     * @throws Exception
+     */
+    function sodium_randombytes_buf($amount)
+    {
+        return ParagonIE_Sodium_Compat::randombytes_buf($amount);
+    }
+}
+
+if (!is_callable('sodium_randombytes_uniform')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::randombytes_uniform()
+     * @param int $upperLimit
+     * @return int
+     * @throws Exception
+     */
+    function sodium_randombytes_uniform($upperLimit)
+    {
+        return ParagonIE_Sodium_Compat::randombytes_uniform($upperLimit);
+    }
+}
+
+if (!is_callable('sodium_randombytes_random16')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::randombytes_random16()
+     * @return int
+     * @throws Exception
+     */
+    function sodium_randombytes_random16()
+    {
+        return ParagonIE_Sodium_Compat::randombytes_random16();
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/lib/php72compat_const.php b/vendor/paragonie/sodium_compat/lib/php72compat_const.php
new file mode 100644
index 0000000..0a076ca
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/lib/php72compat_const.php
@@ -0,0 +1,92 @@
+<?php
+
+const SODIUM_LIBRARY_MAJOR_VERSION = 9;
+const SODIUM_LIBRARY_MINOR_VERSION = 1;
+const SODIUM_LIBRARY_VERSION = '1.0.8';
+
+const SODIUM_BASE64_VARIANT_ORIGINAL = 1;
+const SODIUM_BASE64_VARIANT_ORIGINAL_NO_PADDING = 3;
+const SODIUM_BASE64_VARIANT_URLSAFE = 5;
+const SODIUM_BASE64_VARIANT_URLSAFE_NO_PADDING = 7;
+const SODIUM_CRYPTO_AEAD_AES256GCM_KEYBYTES = 32;
+const SODIUM_CRYPTO_AEAD_AES256GCM_NSECBYTES = 0;
+const SODIUM_CRYPTO_AEAD_AES256GCM_NPUBBYTES = 12;
+const SODIUM_CRYPTO_AEAD_AES256GCM_ABYTES = 16;
+const SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES = 32;
+const SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_NSECBYTES = 0;
+const SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_NPUBBYTES = 8;
+const SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_ABYTES = 16;
+const SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_IETF_KEYBYTES = 32;
+const SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_IETF_NSECBYTES = 0;
+const SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_IETF_NPUBBYTES = 12;
+const SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_IETF_ABYTES = 16;
+const SODIUM_CRYPTO_AEAD_XCHACHA20POLY1305_IETF_KEYBYTES = 32;
+const SODIUM_CRYPTO_AEAD_XCHACHA20POLY1305_IETF_NSECBYTES = 0;
+const SODIUM_CRYPTO_AEAD_XCHACHA20POLY1305_IETF_NPUBBYTES = 24;
+const SODIUM_CRYPTO_AEAD_XCHACHA20POLY1305_IETF_ABYTES = 16;
+const SODIUM_CRYPTO_AUTH_BYTES = 32;
+const SODIUM_CRYPTO_AUTH_KEYBYTES = 32;
+const SODIUM_CRYPTO_BOX_SEALBYTES = 16;
+const SODIUM_CRYPTO_BOX_SECRETKEYBYTES = 32;
+const SODIUM_CRYPTO_BOX_PUBLICKEYBYTES = 32;
+const SODIUM_CRYPTO_BOX_KEYPAIRBYTES = 64;
+const SODIUM_CRYPTO_BOX_MACBYTES = 16;
+const SODIUM_CRYPTO_BOX_NONCEBYTES = 24;
+const SODIUM_CRYPTO_BOX_SEEDBYTES = 32;
+const SODIUM_CRYPTO_KDF_BYTES_MIN = 16;
+const SODIUM_CRYPTO_KDF_BYTES_MAX = 64;
+const SODIUM_CRYPTO_KDF_CONTEXTBYTES = 8;
+const SODIUM_CRYPTO_KDF_KEYBYTES = 32;
+const SODIUM_CRYPTO_KX_BYTES = 32;
+const SODIUM_CRYPTO_KX_PRIMITIVE = 'x25519blake2b';
+const SODIUM_CRYPTO_KX_SEEDBYTES = 32;
+const SODIUM_CRYPTO_KX_KEYPAIRBYTES = 64;
+const SODIUM_CRYPTO_KX_PUBLICKEYBYTES = 32;
+const SODIUM_CRYPTO_KX_SECRETKEYBYTES = 32;
+const SODIUM_CRYPTO_KX_SESSIONKEYBYTES = 32;
+const SODIUM_CRYPTO_GENERICHASH_BYTES = 32;
+const SODIUM_CRYPTO_GENERICHASH_BYTES_MIN = 16;
+const SODIUM_CRYPTO_GENERICHASH_BYTES_MAX = 64;
+const SODIUM_CRYPTO_GENERICHASH_KEYBYTES = 32;
+const SODIUM_CRYPTO_GENERICHASH_KEYBYTES_MIN = 16;
+const SODIUM_CRYPTO_GENERICHASH_KEYBYTES_MAX = 64;
+const SODIUM_CRYPTO_PWHASH_SALTBYTES = 16;
+const SODIUM_CRYPTO_PWHASH_STRPREFIX = '$argon2id$';
+const SODIUM_CRYPTO_PWHASH_ALG_ARGON2I13 = 1;
+const SODIUM_CRYPTO_PWHASH_ALG_ARGON2ID13 = 2;
+const SODIUM_CRYPTO_PWHASH_MEMLIMIT_INTERACTIVE = 33554432;
+const SODIUM_CRYPTO_PWHASH_OPSLIMIT_INTERACTIVE = 4;
+const SODIUM_CRYPTO_PWHASH_MEMLIMIT_MODERATE = 134217728;
+const SODIUM_CRYPTO_PWHASH_OPSLIMIT_MODERATE = 6;
+const SODIUM_CRYPTO_PWHASH_MEMLIMIT_SENSITIVE = 536870912;
+const SODIUM_CRYPTO_PWHASH_OPSLIMIT_SENSITIVE = 8;
+const SODIUM_CRYPTO_PWHASH_SCRYPTSALSA208SHA256_SALTBYTES = 32;
+const SODIUM_CRYPTO_PWHASH_SCRYPTSALSA208SHA256_STRPREFIX = '$7$';
+const SODIUM_CRYPTO_PWHASH_SCRYPTSALSA208SHA256_OPSLIMIT_INTERACTIVE = 534288;
+const SODIUM_CRYPTO_PWHASH_SCRYPTSALSA208SHA256_MEMLIMIT_INTERACTIVE = 16777216;
+const SODIUM_CRYPTO_PWHASH_SCRYPTSALSA208SHA256_OPSLIMIT_SENSITIVE = 33554432;
+const SODIUM_CRYPTO_PWHASH_SCRYPTSALSA208SHA256_MEMLIMIT_SENSITIVE = 1073741824;
+const SODIUM_CRYPTO_SCALARMULT_BYTES = 32;
+const SODIUM_CRYPTO_SCALARMULT_SCALARBYTES = 32;
+const SODIUM_CRYPTO_SHORTHASH_BYTES = 8;
+const SODIUM_CRYPTO_SHORTHASH_KEYBYTES = 16;
+const SODIUM_CRYPTO_SECRETBOX_KEYBYTES = 32;
+const SODIUM_CRYPTO_SECRETBOX_MACBYTES = 16;
+const SODIUM_CRYPTO_SECRETBOX_NONCEBYTES = 24;
+const SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_ABYTES = 17;
+const SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_HEADERBYTES = 24;
+const SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_KEYBYTES = 32;
+const SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_TAG_PUSH = 0;
+const SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_TAG_PULL = 1;
+const SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_TAG_REKEY = 2;
+const SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_TAG_FINAL = 3;
+const SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_MESSAGEBYTES_MAX = 0x3fffffff80;
+const SODIUM_CRYPTO_SIGN_BYTES = 64;
+const SODIUM_CRYPTO_SIGN_SEEDBYTES = 32;
+const SODIUM_CRYPTO_SIGN_PUBLICKEYBYTES = 32;
+const SODIUM_CRYPTO_SIGN_SECRETKEYBYTES = 64;
+const SODIUM_CRYPTO_SIGN_KEYPAIRBYTES = 96;
+const SODIUM_CRYPTO_STREAM_KEYBYTES = 32;
+const SODIUM_CRYPTO_STREAM_NONCEBYTES = 24;
+const SODIUM_CRYPTO_STREAM_XCHACHA20_KEYBYTES = 32;
+const SODIUM_CRYPTO_STREAM_XCHACHA20_NONCEBYTES = 24;
diff --git a/vendor/paragonie/sodium_compat/lib/ristretto255.php b/vendor/paragonie/sodium_compat/lib/ristretto255.php
new file mode 100644
index 0000000..a7522ea
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/lib/ristretto255.php
@@ -0,0 +1,239 @@
+<?php
+
+if (!defined('SODIUM_CRYPTO_CORE_RISTRETTO255_BYTES')) {
+    define(
+        'SODIUM_CRYPTO_CORE_RISTRETTO255_BYTES',
+        ParagonIE_Sodium_Compat::CRYPTO_CORE_RISTRETTO255_BYTES
+    );
+    define('SODIUM_COMPAT_POLYFILLED_RISTRETTO255', true);
+}
+if (!defined('SODIUM_CRYPTO_CORE_RISTRETTO255_HASHBYTES')) {
+    define(
+        'SODIUM_CRYPTO_CORE_RISTRETTO255_HASHBYTES',
+        ParagonIE_Sodium_Compat::CRYPTO_CORE_RISTRETTO255_HASHBYTES
+    );
+}
+if (!defined('SODIUM_CRYPTO_CORE_RISTRETTO255_SCALARBYTES')) {
+    define(
+        'SODIUM_CRYPTO_CORE_RISTRETTO255_SCALARBYTES',
+        ParagonIE_Sodium_Compat::CRYPTO_CORE_RISTRETTO255_SCALARBYTES
+    );
+}
+if (!defined('SODIUM_CRYPTO_CORE_RISTRETTO255_NONREDUCEDSCALARBYTES')) {
+    define(
+        'SODIUM_CRYPTO_CORE_RISTRETTO255_NONREDUCEDSCALARBYTES',
+        ParagonIE_Sodium_Compat::CRYPTO_CORE_RISTRETTO255_NONREDUCEDSCALARBYTES
+    );
+}
+if (!defined('SODIUM_CRYPTO_SCALARMULT_RISTRETTO255_SCALARBYTES')) {
+    define(
+        'SODIUM_CRYPTO_SCALARMULT_RISTRETTO255_SCALARBYTES',
+        ParagonIE_Sodium_Compat::CRYPTO_SCALARMULT_RISTRETTO255_SCALARBYTES
+    );
+}
+if (!defined('SODIUM_CRYPTO_SCALARMULT_RISTRETTO255_BYTES')) {
+    define(
+        'SODIUM_CRYPTO_SCALARMULT_RISTRETTO255_BYTES',
+        ParagonIE_Sodium_Compat::CRYPTO_SCALARMULT_RISTRETTO255_BYTES
+    );
+}
+
+if (!is_callable('sodium_crypto_core_ristretto255_add')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::ristretto255_add()
+     *
+     * @param string $p
+     * @param string $q
+     * @return string
+     * @throws SodiumException
+     */
+    function sodium_crypto_core_ristretto255_add($p, $q)
+    {
+        return ParagonIE_Sodium_Compat::ristretto255_add($p, $q, true);
+    }
+}
+if (!is_callable('sodium_crypto_core_ristretto255_from_hash')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::ristretto255_from_hash()
+     *
+     * @param string $r
+     * @return string
+     * @throws SodiumException
+     */
+    function sodium_crypto_core_ristretto255_from_hash($r)
+    {
+        return ParagonIE_Sodium_Compat::ristretto255_from_hash($r, true);
+    }
+}
+if (!is_callable('sodium_crypto_core_ristretto255_is_valid_point')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::ristretto255_is_valid_point()
+     *
+     * @param string $p
+     * @return bool
+     * @throws SodiumException
+     */
+    function sodium_crypto_core_ristretto255_is_valid_point($p)
+    {
+        return ParagonIE_Sodium_Compat::ristretto255_is_valid_point($p, true);
+    }
+}
+if (!is_callable('sodium_crypto_core_ristretto255_random')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::ristretto255_random()
+     *
+     * @return string
+     * @throws SodiumException
+     */
+    function sodium_crypto_core_ristretto255_random()
+    {
+        return ParagonIE_Sodium_Compat::ristretto255_random(true);
+    }
+}
+if (!is_callable('sodium_crypto_core_ristretto255_scalar_add')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::ristretto255_scalar_add()
+     *
+     * @param string $p
+     * @param string $q
+     * @return string
+     * @throws SodiumException
+     */
+    function sodium_crypto_core_ristretto255_scalar_add($p, $q)
+    {
+        return ParagonIE_Sodium_Compat::ristretto255_scalar_add($p, $q, true);
+    }
+}
+if (!is_callable('sodium_crypto_core_ristretto255_scalar_complement')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::ristretto255_scalar_complement()
+     *
+     * @param string $p
+     * @return string
+     * @throws SodiumException
+     */
+    function sodium_crypto_core_ristretto255_scalar_complement($p)
+    {
+        return ParagonIE_Sodium_Compat::ristretto255_scalar_complement($p, true);
+    }
+}
+if (!is_callable('sodium_crypto_core_ristretto255_scalar_invert')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::ristretto255_scalar_invert()
+     *
+     * @param string $p
+     * @return string
+     * @throws SodiumException
+     */
+    function sodium_crypto_core_ristretto255_scalar_invert($p)
+    {
+        return ParagonIE_Sodium_Compat::ristretto255_scalar_invert($p, true);
+    }
+}
+if (!is_callable('sodium_crypto_core_ristretto255_scalar_mul')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::ristretto255_scalar_mul()
+     *
+     * @param string $p
+     * @param string $q
+     * @return string
+     * @throws SodiumException
+     */
+    function sodium_crypto_core_ristretto255_scalar_mul($p, $q)
+    {
+        return ParagonIE_Sodium_Compat::ristretto255_scalar_mul($p, $q, true);
+    }
+}
+if (!is_callable('sodium_crypto_core_ristretto255_scalar_negate')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::ristretto255_scalar_negate()
+     *
+     * @param string $p
+     * @return string
+     * @throws SodiumException
+     */
+    function sodium_crypto_core_ristretto255_scalar_negate($p)
+    {
+        return ParagonIE_Sodium_Compat::ristretto255_scalar_negate($p, true);
+    }
+}
+if (!is_callable('sodium_crypto_core_ristretto255_scalar_random')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::ristretto255_scalar_random()
+     *
+     * @return string
+     * @throws SodiumException
+     */
+    function sodium_crypto_core_ristretto255_scalar_random()
+    {
+        return ParagonIE_Sodium_Compat::ristretto255_scalar_random(true);
+    }
+}
+if (!is_callable('sodium_crypto_core_ristretto255_scalar_reduce')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::ristretto255_scalar_reduce()
+     *
+     * @param string $p
+     * @return string
+     * @throws SodiumException
+     */
+    function sodium_crypto_core_ristretto255_scalar_reduce($p)
+    {
+        return ParagonIE_Sodium_Compat::ristretto255_scalar_reduce($p, true);
+    }
+}
+if (!is_callable('sodium_crypto_core_ristretto255_scalar_sub')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::ristretto255_scalar_sub()
+     *
+     * @param string $p
+     * @param string $q
+     * @return string
+     * @throws SodiumException
+     */
+    function sodium_crypto_core_ristretto255_scalar_sub($p, $q)
+    {
+        return ParagonIE_Sodium_Compat::ristretto255_scalar_sub($p, $q, true);
+    }
+}
+if (!is_callable('sodium_crypto_core_ristretto255_sub')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::ristretto255_sub()
+     *
+     * @param string $p
+     * @param string $q
+     * @return string
+     * @throws SodiumException
+     */
+    function sodium_crypto_core_ristretto255_sub($p, $q)
+    {
+        return ParagonIE_Sodium_Compat::ristretto255_sub($p, $q, true);
+    }
+}
+if (!is_callable('sodium_crypto_scalarmult_ristretto255')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_scalarmult_ristretto255()
+     * @param string $n
+     * @param string $p
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_scalarmult_ristretto255($n, $p)
+    {
+        return ParagonIE_Sodium_Compat::scalarmult_ristretto255($n, $p, true);
+    }
+}
+if (!is_callable('sodium_crypto_scalarmult_ristretto255_base')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_scalarmult_ristretto255_base()
+     * @param string $n
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_scalarmult_ristretto255_base($n)
+    {
+        return ParagonIE_Sodium_Compat::scalarmult_ristretto255_base($n, true);
+    }
+}
+\ No newline at end of file
diff --git a/vendor/paragonie/sodium_compat/lib/sodium_compat.php b/vendor/paragonie/sodium_compat/lib/sodium_compat.php
new file mode 100644
index 0000000..80495be
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/lib/sodium_compat.php
@@ -0,0 +1,827 @@
+<?php
+namespace Sodium;
+
+require_once dirname(dirname(__FILE__)) . '/autoload.php';
+
+use ParagonIE_Sodium_Compat;
+
+/**
+ * This file will monkey patch the pure-PHP implementation in place of the
+ * PECL functions, but only if they do not already exist.
+ *
+ * Thus, the functions just proxy to the appropriate ParagonIE_Sodium_Compat
+ * method.
+ */
+if (!is_callable('\\Sodium\\bin2hex')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::bin2hex()
+     * @param string $string
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function bin2hex($string)
+    {
+        return ParagonIE_Sodium_Compat::bin2hex($string);
+    }
+}
+if (!is_callable('\\Sodium\\compare')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::compare()
+     * @param string $a
+     * @param string $b
+     * @return int
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function compare($a, $b)
+    {
+        return ParagonIE_Sodium_Compat::compare($a, $b);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_aead_aes256gcm_decrypt')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_aead_aes256gcm_decrypt()
+     * @param string $message
+     * @param string $assocData
+     * @param string $nonce
+     * @param string $key
+     * @return string|bool
+     */
+    function crypto_aead_aes256gcm_decrypt($message, $assocData, $nonce, $key)
+    {
+        try {
+            return ParagonIE_Sodium_Compat::crypto_aead_aes256gcm_decrypt($message, $assocData, $nonce, $key);
+        } catch (\TypeError $ex) {
+            return false;
+        } catch (\SodiumException $ex) {
+            return false;
+        }
+    }
+}
+if (!is_callable('\\Sodium\\crypto_aead_aes256gcm_encrypt')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_aead_aes256gcm_encrypt()
+     * @param string $message
+     * @param string $assocData
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_aead_aes256gcm_encrypt($message, $assocData, $nonce, $key)
+    {
+        return ParagonIE_Sodium_Compat::crypto_aead_aes256gcm_encrypt($message, $assocData, $nonce, $key);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_aead_aes256gcm_is_available')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_aead_aes256gcm_is_available()
+     * @return bool
+     */
+    function crypto_aead_aes256gcm_is_available()
+    {
+        return ParagonIE_Sodium_Compat::crypto_aead_aes256gcm_is_available();
+    }
+}
+if (!is_callable('\\Sodium\\crypto_aead_chacha20poly1305_decrypt')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_aead_chacha20poly1305_decrypt()
+     * @param string $message
+     * @param string $assocData
+     * @param string $nonce
+     * @param string $key
+     * @return string|bool
+     */
+    function crypto_aead_chacha20poly1305_decrypt($message, $assocData, $nonce, $key)
+    {
+        try {
+            return ParagonIE_Sodium_Compat::crypto_aead_chacha20poly1305_decrypt($message, $assocData, $nonce, $key);
+        } catch (\TypeError $ex) {
+            return false;
+        } catch (\SodiumException $ex) {
+            return false;
+        }
+    }
+}
+if (!is_callable('\\Sodium\\crypto_aead_chacha20poly1305_encrypt')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_aead_chacha20poly1305_encrypt()
+     * @param string $message
+     * @param string $assocData
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_aead_chacha20poly1305_encrypt($message, $assocData, $nonce, $key)
+    {
+        return ParagonIE_Sodium_Compat::crypto_aead_chacha20poly1305_encrypt($message, $assocData, $nonce, $key);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_aead_chacha20poly1305_ietf_decrypt')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_aead_chacha20poly1305_ietf_decrypt()
+     * @param string $message
+     * @param string $assocData
+     * @param string $nonce
+     * @param string $key
+     * @return string|bool
+     */
+    function crypto_aead_chacha20poly1305_ietf_decrypt($message, $assocData, $nonce, $key)
+    {
+        try {
+            return ParagonIE_Sodium_Compat::crypto_aead_chacha20poly1305_ietf_decrypt($message, $assocData, $nonce, $key);
+        } catch (\TypeError $ex) {
+            return false;
+        } catch (\SodiumException $ex) {
+            return false;
+        }
+    }
+}
+if (!is_callable('\\Sodium\\crypto_aead_chacha20poly1305_ietf_encrypt')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_aead_chacha20poly1305_ietf_encrypt()
+     * @param string $message
+     * @param string $assocData
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_aead_chacha20poly1305_ietf_encrypt($message, $assocData, $nonce, $key)
+    {
+        return ParagonIE_Sodium_Compat::crypto_aead_chacha20poly1305_ietf_encrypt($message, $assocData, $nonce, $key);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_auth')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_auth()
+     * @param string $message
+     * @param string $key
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_auth($message, $key)
+    {
+        return ParagonIE_Sodium_Compat::crypto_auth($message, $key);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_auth_verify')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_auth_verify()
+     * @param string $mac
+     * @param string $message
+     * @param string $key
+     * @return bool
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_auth_verify($mac, $message, $key)
+    {
+        return ParagonIE_Sodium_Compat::crypto_auth_verify($mac, $message, $key);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_box')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_box()
+     * @param string $message
+     * @param string $nonce
+     * @param string $kp
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_box($message, $nonce, $kp)
+    {
+        return ParagonIE_Sodium_Compat::crypto_box($message, $nonce, $kp);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_box_keypair')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_box_keypair()
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_box_keypair()
+    {
+        return ParagonIE_Sodium_Compat::crypto_box_keypair();
+    }
+}
+if (!is_callable('\\Sodium\\crypto_box_keypair_from_secretkey_and_publickey')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_box_keypair_from_secretkey_and_publickey()
+     * @param string $sk
+     * @param string $pk
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_box_keypair_from_secretkey_and_publickey($sk, $pk)
+    {
+        return ParagonIE_Sodium_Compat::crypto_box_keypair_from_secretkey_and_publickey($sk, $pk);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_box_open')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_box_open()
+     * @param string $message
+     * @param string $nonce
+     * @param string $kp
+     * @return string|bool
+     */
+    function crypto_box_open($message, $nonce, $kp)
+    {
+        try {
+            return ParagonIE_Sodium_Compat::crypto_box_open($message, $nonce, $kp);
+        } catch (\TypeError $ex) {
+            return false;
+        } catch (\SodiumException $ex) {
+            return false;
+        }
+    }
+}
+if (!is_callable('\\Sodium\\crypto_box_publickey')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_box_publickey()
+     * @param string $keypair
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_box_publickey($keypair)
+    {
+        return ParagonIE_Sodium_Compat::crypto_box_publickey($keypair);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_box_publickey_from_secretkey')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_box_publickey_from_secretkey()
+     * @param string $sk
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_box_publickey_from_secretkey($sk)
+    {
+        return ParagonIE_Sodium_Compat::crypto_box_publickey_from_secretkey($sk);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_box_seal')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_box_seal_open()
+     * @param string $message
+     * @param string $publicKey
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_box_seal($message, $publicKey)
+    {
+        return ParagonIE_Sodium_Compat::crypto_box_seal($message, $publicKey);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_box_seal_open')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_box_seal_open()
+     * @param string $message
+     * @param string $kp
+     * @return string|bool
+     */
+    function crypto_box_seal_open($message, $kp)
+    {
+        try {
+            return ParagonIE_Sodium_Compat::crypto_box_seal_open($message, $kp);
+        } catch (\TypeError $ex) {
+            return false;
+        } catch (\SodiumException $ex) {
+            return false;
+        }
+    }
+}
+if (!is_callable('\\Sodium\\crypto_box_secretkey')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_box_secretkey()
+     * @param string $keypair
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_box_secretkey($keypair)
+    {
+        return ParagonIE_Sodium_Compat::crypto_box_secretkey($keypair);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_generichash')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_generichash()
+     * @param string $message
+     * @param string|null $key
+     * @param int $outLen
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_generichash($message, $key = null, $outLen = 32)
+    {
+        return ParagonIE_Sodium_Compat::crypto_generichash($message, $key, $outLen);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_generichash_final')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_generichash_final()
+     * @param string|null $ctx
+     * @param int $outputLength
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_generichash_final(&$ctx, $outputLength = 32)
+    {
+        return ParagonIE_Sodium_Compat::crypto_generichash_final($ctx, $outputLength);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_generichash_init')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_generichash_init()
+     * @param string|null $key
+     * @param int $outLen
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_generichash_init($key = null, $outLen = 32)
+    {
+        return ParagonIE_Sodium_Compat::crypto_generichash_init($key, $outLen);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_generichash_update')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_generichash_update()
+     * @param string|null $ctx
+     * @param string $message
+     * @return void
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_generichash_update(&$ctx, $message = '')
+    {
+        ParagonIE_Sodium_Compat::crypto_generichash_update($ctx, $message);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_kx')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_kx()
+     * @param string $my_secret
+     * @param string $their_public
+     * @param string $client_public
+     * @param string $server_public
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_kx($my_secret, $their_public, $client_public, $server_public)
+    {
+        return ParagonIE_Sodium_Compat::crypto_kx(
+            $my_secret,
+            $their_public,
+            $client_public,
+            $server_public,
+            true
+        );
+    }
+}
+if (!is_callable('\\Sodium\\crypto_pwhash')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_pwhash()
+     * @param int $outlen
+     * @param string $passwd
+     * @param string $salt
+     * @param int $opslimit
+     * @param int $memlimit
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_pwhash($outlen, $passwd, $salt, $opslimit, $memlimit)
+    {
+        return ParagonIE_Sodium_Compat::crypto_pwhash($outlen, $passwd, $salt, $opslimit, $memlimit);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_pwhash_str')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_pwhash_str()
+     * @param string $passwd
+     * @param int $opslimit
+     * @param int $memlimit
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_pwhash_str($passwd, $opslimit, $memlimit)
+    {
+        return ParagonIE_Sodium_Compat::crypto_pwhash_str($passwd, $opslimit, $memlimit);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_pwhash_str_verify')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_pwhash_str_verify()
+     * @param string $passwd
+     * @param string $hash
+     * @return bool
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_pwhash_str_verify($passwd, $hash)
+    {
+        return ParagonIE_Sodium_Compat::crypto_pwhash_str_verify($passwd, $hash);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_pwhash_scryptsalsa208sha256')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_pwhash_scryptsalsa208sha256()
+     * @param int $outlen
+     * @param string $passwd
+     * @param string $salt
+     * @param int $opslimit
+     * @param int $memlimit
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_pwhash_scryptsalsa208sha256($outlen, $passwd, $salt, $opslimit, $memlimit)
+    {
+        return ParagonIE_Sodium_Compat::crypto_pwhash_scryptsalsa208sha256($outlen, $passwd, $salt, $opslimit, $memlimit);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_pwhash_scryptsalsa208sha256_str')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_pwhash_scryptsalsa208sha256_str()
+     * @param string $passwd
+     * @param int $opslimit
+     * @param int $memlimit
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_pwhash_scryptsalsa208sha256_str($passwd, $opslimit, $memlimit)
+    {
+        return ParagonIE_Sodium_Compat::crypto_pwhash_scryptsalsa208sha256_str($passwd, $opslimit, $memlimit);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_pwhash_scryptsalsa208sha256_str_verify')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_pwhash_scryptsalsa208sha256_str_verify()
+     * @param string $passwd
+     * @param string $hash
+     * @return bool
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_pwhash_scryptsalsa208sha256_str_verify($passwd, $hash)
+    {
+        return ParagonIE_Sodium_Compat::crypto_pwhash_scryptsalsa208sha256_str_verify($passwd, $hash);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_scalarmult')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_scalarmult()
+     * @param string $n
+     * @param string $p
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_scalarmult($n, $p)
+    {
+        return ParagonIE_Sodium_Compat::crypto_scalarmult($n, $p);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_scalarmult_base')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_scalarmult_base()
+     * @param string $n
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_scalarmult_base($n)
+    {
+        return ParagonIE_Sodium_Compat::crypto_scalarmult_base($n);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_secretbox')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_secretbox()
+     * @param string $message
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_secretbox($message, $nonce, $key)
+    {
+        return ParagonIE_Sodium_Compat::crypto_secretbox($message, $nonce, $key);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_secretbox_open')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_secretbox_open()
+     * @param string $message
+     * @param string $nonce
+     * @param string $key
+     * @return string|bool
+     */
+    function crypto_secretbox_open($message, $nonce, $key)
+    {
+        try {
+            return ParagonIE_Sodium_Compat::crypto_secretbox_open($message, $nonce, $key);
+        } catch (\TypeError $ex) {
+            return false;
+        } catch (\SodiumException $ex) {
+            return false;
+        }
+    }
+}
+if (!is_callable('\\Sodium\\crypto_shorthash')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_shorthash()
+     * @param string $message
+     * @param string $key
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_shorthash($message, $key = '')
+    {
+        return ParagonIE_Sodium_Compat::crypto_shorthash($message, $key);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_sign')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_sign()
+     * @param string $message
+     * @param string $sk
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_sign($message, $sk)
+    {
+        return ParagonIE_Sodium_Compat::crypto_sign($message, $sk);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_sign_detached')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_sign_detached()
+     * @param string $message
+     * @param string $sk
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_sign_detached($message, $sk)
+    {
+        return ParagonIE_Sodium_Compat::crypto_sign_detached($message, $sk);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_sign_keypair')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_sign_keypair()
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_sign_keypair()
+    {
+        return ParagonIE_Sodium_Compat::crypto_sign_keypair();
+    }
+}
+if (!is_callable('\\Sodium\\crypto_sign_open')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_sign_open()
+     * @param string $signedMessage
+     * @param string $pk
+     * @return string|bool
+     */
+    function crypto_sign_open($signedMessage, $pk)
+    {
+        try {
+            return ParagonIE_Sodium_Compat::crypto_sign_open($signedMessage, $pk);
+        } catch (\TypeError $ex) {
+            return false;
+        } catch (\SodiumException $ex) {
+            return false;
+        }
+    }
+}
+if (!is_callable('\\Sodium\\crypto_sign_publickey')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_sign_publickey()
+     * @param string $keypair
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_sign_publickey($keypair)
+    {
+        return ParagonIE_Sodium_Compat::crypto_sign_publickey($keypair);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_sign_publickey_from_secretkey')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_sign_publickey_from_secretkey()
+     * @param string $sk
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_sign_publickey_from_secretkey($sk)
+    {
+        return ParagonIE_Sodium_Compat::crypto_sign_publickey_from_secretkey($sk);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_sign_secretkey')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_sign_secretkey()
+     * @param string $keypair
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_sign_secretkey($keypair)
+    {
+        return ParagonIE_Sodium_Compat::crypto_sign_secretkey($keypair);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_sign_seed_keypair')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_sign_seed_keypair()
+     * @param string $seed
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_sign_seed_keypair($seed)
+    {
+        return ParagonIE_Sodium_Compat::crypto_sign_seed_keypair($seed);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_sign_verify_detached')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_sign_verify_detached()
+     * @param string $signature
+     * @param string $message
+     * @param string $pk
+     * @return bool
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_sign_verify_detached($signature, $message, $pk)
+    {
+        return ParagonIE_Sodium_Compat::crypto_sign_verify_detached($signature, $message, $pk);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_sign_ed25519_pk_to_curve25519')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_sign_ed25519_pk_to_curve25519()
+     * @param string $pk
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_sign_ed25519_pk_to_curve25519($pk)
+    {
+        return ParagonIE_Sodium_Compat::crypto_sign_ed25519_pk_to_curve25519($pk);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_sign_ed25519_sk_to_curve25519')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_sign_ed25519_sk_to_curve25519()
+     * @param string $sk
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_sign_ed25519_sk_to_curve25519($sk)
+    {
+        return ParagonIE_Sodium_Compat::crypto_sign_ed25519_sk_to_curve25519($sk);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_stream')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_stream()
+     * @param int $len
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_stream($len, $nonce, $key)
+    {
+        return ParagonIE_Sodium_Compat::crypto_stream($len, $nonce, $key);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_stream_xor')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_stream_xor()
+     * @param string $message
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function crypto_stream_xor($message, $nonce, $key)
+    {
+        return ParagonIE_Sodium_Compat::crypto_stream_xor($message, $nonce, $key);
+    }
+}
+if (!is_callable('\\Sodium\\hex2bin')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::hex2bin()
+     * @param string $string
+     * @return string
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function hex2bin($string)
+    {
+        return ParagonIE_Sodium_Compat::hex2bin($string);
+    }
+}
+if (!is_callable('\\Sodium\\memcmp')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::memcmp()
+     * @param string $a
+     * @param string $b
+     * @return int
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function memcmp($a, $b)
+    {
+        return ParagonIE_Sodium_Compat::memcmp($a, $b);
+    }
+}
+if (!is_callable('\\Sodium\\memzero')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::memzero()
+     * @param string $str
+     * @return void
+     * @throws \SodiumException
+     * @throws \TypeError
+     */
+    function memzero(&$str)
+    {
+        ParagonIE_Sodium_Compat::memzero($str);
+    }
+}
+if (!is_callable('\\Sodium\\randombytes_buf')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::randombytes_buf()
+     * @param int $amount
+     * @return string
+     * @throws \TypeError
+     */
+    function randombytes_buf($amount)
+    {
+        return ParagonIE_Sodium_Compat::randombytes_buf($amount);
+    }
+}
+
+if (!is_callable('\\Sodium\\randombytes_uniform')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::randombytes_uniform()
+     * @param int $upperLimit
+     * @return int
+     * @throws \SodiumException
+     * @throws \Error
+     */
+    function randombytes_uniform($upperLimit)
+    {
+        return ParagonIE_Sodium_Compat::randombytes_uniform($upperLimit);
+    }
+}
+
+if (!is_callable('\\Sodium\\randombytes_random16')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::randombytes_random16()
+     * @return int
+     */
+    function randombytes_random16()
+    {
+        return ParagonIE_Sodium_Compat::randombytes_random16();
+    }
+}
+
+if (!defined('\\Sodium\\CRYPTO_AUTH_BYTES')) {
+    require_once dirname(__FILE__) . '/constants.php';
+}
diff --git a/vendor/paragonie/sodium_compat/lib/stream-xchacha20.php b/vendor/paragonie/sodium_compat/lib/stream-xchacha20.php
new file mode 100644
index 0000000..44a6b5b
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/lib/stream-xchacha20.php
@@ -0,0 +1,43 @@
+<?php
+
+if (!is_callable('sodium_crypto_stream_xchacha20')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_stream_xchacha20()
+     * @param int $len
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_stream_xchacha20($len, $nonce, $key)
+    {
+        return ParagonIE_Sodium_Compat::crypto_stream_xchacha20($len, $nonce, $key, true);
+    }
+}
+if (!is_callable('sodium_crypto_stream_xchacha20_keygen')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_stream_xchacha20_keygen()
+     * @return string
+     * @throws Exception
+     */
+    function sodium_crypto_stream_xchacha20_keygen()
+    {
+        return ParagonIE_Sodium_Compat::crypto_stream_xchacha20_keygen();
+    }
+}
+if (!is_callable('sodium_crypto_stream_xchacha20_xor')) {
+    /**
+     * @see ParagonIE_Sodium_Compat::crypto_stream_xchacha20_xor()
+     * @param string $message
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    function sodium_crypto_stream_xchacha20_xor($message, $nonce, $key)
+    {
+        return ParagonIE_Sodium_Compat::crypto_stream_xchacha20_xor($message, $nonce, $key, true);
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/namespaced/Compat.php b/vendor/paragonie/sodium_compat/namespaced/Compat.php
new file mode 100644
index 0000000..c40f7fb
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/namespaced/Compat.php
@@ -0,0 +1,7 @@
+<?php
+namespace ParagonIE\Sodium;
+
+class Compat extends \ParagonIE_Sodium_Compat
+{
+
+}
diff --git a/vendor/paragonie/sodium_compat/namespaced/Core/BLAKE2b.php b/vendor/paragonie/sodium_compat/namespaced/Core/BLAKE2b.php
new file mode 100644
index 0000000..f152c5a
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/namespaced/Core/BLAKE2b.php
@@ -0,0 +1,7 @@
+<?php
+namespace ParagonIE\Sodium\Core;
+
+class BLAKE2b extends \ParagonIE_Sodium_Core_BLAKE2b
+{
+
+}
diff --git a/vendor/paragonie/sodium_compat/namespaced/Core/ChaCha20.php b/vendor/paragonie/sodium_compat/namespaced/Core/ChaCha20.php
new file mode 100644
index 0000000..08936b5
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/namespaced/Core/ChaCha20.php
@@ -0,0 +1,7 @@
+<?php
+namespace ParagonIE\Sodium\Core;
+
+class ChaCha20 extends \ParagonIE_Sodium_Core_ChaCha20
+{
+
+}
diff --git a/vendor/paragonie/sodium_compat/namespaced/Core/ChaCha20/Ctx.php b/vendor/paragonie/sodium_compat/namespaced/Core/ChaCha20/Ctx.php
new file mode 100644
index 0000000..ea07a26
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/namespaced/Core/ChaCha20/Ctx.php
@@ -0,0 +1,7 @@
+<?php
+namespace ParagonIE\Sodium\Core\ChaCha20;
+
+class Ctx extends \ParagonIE_Sodium_Core_ChaCha20_Ctx
+{
+
+}
diff --git a/vendor/paragonie/sodium_compat/namespaced/Core/ChaCha20/IetfCtx.php b/vendor/paragonie/sodium_compat/namespaced/Core/ChaCha20/IetfCtx.php
new file mode 100644
index 0000000..c0b2de8
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/namespaced/Core/ChaCha20/IetfCtx.php
@@ -0,0 +1,7 @@
+<?php
+namespace ParagonIE\Sodium\Core\ChaCha20;
+
+class IetfCtx extends \ParagonIE_Sodium_Core_ChaCha20_IetfCtx
+{
+
+}
diff --git a/vendor/paragonie/sodium_compat/namespaced/Core/Curve25519.php b/vendor/paragonie/sodium_compat/namespaced/Core/Curve25519.php
new file mode 100644
index 0000000..d4a7ce1
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/namespaced/Core/Curve25519.php
@@ -0,0 +1,7 @@
+<?php
+namespace ParagonIE\Sodium\Core;
+
+class Curve25519 extends \ParagonIE_Sodium_Core_Curve25519
+{
+
+}
diff --git a/vendor/paragonie/sodium_compat/namespaced/Core/Curve25519/Fe.php b/vendor/paragonie/sodium_compat/namespaced/Core/Curve25519/Fe.php
new file mode 100644
index 0000000..7129065
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/namespaced/Core/Curve25519/Fe.php
@@ -0,0 +1,7 @@
+<?php
+namespace ParagonIE\Sodium\Core\Curve25519;
+
+class Fe extends \ParagonIE_Sodium_Core_Curve25519_Fe
+{
+
+}
diff --git a/vendor/paragonie/sodium_compat/namespaced/Core/Curve25519/Ge/Cached.php b/vendor/paragonie/sodium_compat/namespaced/Core/Curve25519/Ge/Cached.php
new file mode 100644
index 0000000..269d6a7
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/namespaced/Core/Curve25519/Ge/Cached.php
@@ -0,0 +1,7 @@
+<?php
+namespace ParagonIE\Sodium\Core\Curve25519\Ge;
+
+class Cached extends \ParagonIE_Sodium_Core_Curve25519_Ge_Cached
+{
+
+}
diff --git a/vendor/paragonie/sodium_compat/namespaced/Core/Curve25519/Ge/P1p1.php b/vendor/paragonie/sodium_compat/namespaced/Core/Curve25519/Ge/P1p1.php
new file mode 100644
index 0000000..0b70046
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/namespaced/Core/Curve25519/Ge/P1p1.php
@@ -0,0 +1,7 @@
+<?php
+namespace ParagonIE\Sodium\Core\Curve25519\Ge;
+
+class P1p1 extends \ParagonIE_Sodium_Core_Curve25519_Ge_P1p1
+{
+
+}
diff --git a/vendor/paragonie/sodium_compat/namespaced/Core/Curve25519/Ge/P2.php b/vendor/paragonie/sodium_compat/namespaced/Core/Curve25519/Ge/P2.php
new file mode 100644
index 0000000..e0c76c6
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/namespaced/Core/Curve25519/Ge/P2.php
@@ -0,0 +1,7 @@
+<?php
+namespace ParagonIE\Sodium\Core\Curve25519\Ge;
+
+class P2 extends \ParagonIE_Sodium_Core_Curve25519_Ge_P2
+{
+
+}
diff --git a/vendor/paragonie/sodium_compat/namespaced/Core/Curve25519/Ge/P3.php b/vendor/paragonie/sodium_compat/namespaced/Core/Curve25519/Ge/P3.php
new file mode 100644
index 0000000..1a9cad7
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/namespaced/Core/Curve25519/Ge/P3.php
@@ -0,0 +1,7 @@
+<?php
+namespace ParagonIE\Sodium\Core\Curve25519\Ge;
+
+class P3 extends \ParagonIE_Sodium_Core_Curve25519_Ge_P3
+{
+
+}
diff --git a/vendor/paragonie/sodium_compat/namespaced/Core/Curve25519/Ge/Precomp.php b/vendor/paragonie/sodium_compat/namespaced/Core/Curve25519/Ge/Precomp.php
new file mode 100644
index 0000000..07e509a
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/namespaced/Core/Curve25519/Ge/Precomp.php
@@ -0,0 +1,7 @@
+<?php
+namespace ParagonIE\Sodium\Core\Curve25519\Ge;
+
+class Precomp extends \ParagonIE_Sodium_Core_Curve25519_Ge_Precomp
+{
+
+}
diff --git a/vendor/paragonie/sodium_compat/namespaced/Core/Curve25519/H.php b/vendor/paragonie/sodium_compat/namespaced/Core/Curve25519/H.php
new file mode 100644
index 0000000..5ba7fd8
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/namespaced/Core/Curve25519/H.php
@@ -0,0 +1,7 @@
+<?php
+namespace ParagonIE\Sodium\Core\Curve25519;
+
+class H extends \ParagonIE_Sodium_Core_Curve25519_H
+{
+
+}
diff --git a/vendor/paragonie/sodium_compat/namespaced/Core/Ed25519.php b/vendor/paragonie/sodium_compat/namespaced/Core/Ed25519.php
new file mode 100644
index 0000000..1393988
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/namespaced/Core/Ed25519.php
@@ -0,0 +1,7 @@
+<?php
+namespace ParagonIE\Sodium\Core;
+
+class Ed25519 extends \ParagonIE_Sodium_Core_Ed25519
+{
+
+}
diff --git a/vendor/paragonie/sodium_compat/namespaced/Core/HChaCha20.php b/vendor/paragonie/sodium_compat/namespaced/Core/HChaCha20.php
new file mode 100644
index 0000000..d96dc14
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/namespaced/Core/HChaCha20.php
@@ -0,0 +1,7 @@
+<?php
+namespace ParagonIE\Sodium\Core;
+
+class HChaCha20 extends \ParagonIE_Sodium_Core_HChaCha20
+{
+
+}
diff --git a/vendor/paragonie/sodium_compat/namespaced/Core/HSalsa20.php b/vendor/paragonie/sodium_compat/namespaced/Core/HSalsa20.php
new file mode 100644
index 0000000..e526b99
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/namespaced/Core/HSalsa20.php
@@ -0,0 +1,7 @@
+<?php
+namespace ParagonIE\Sodium\Core;
+
+class HSalsa20 extends \ParagonIE_Sodium_Core_HSalsa20
+{
+
+}
diff --git a/vendor/paragonie/sodium_compat/namespaced/Core/Poly1305.php b/vendor/paragonie/sodium_compat/namespaced/Core/Poly1305.php
new file mode 100644
index 0000000..acfc6d0
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/namespaced/Core/Poly1305.php
@@ -0,0 +1,7 @@
+<?php
+namespace ParagonIE\Sodium\Core;
+
+class Poly1305 extends \ParagonIE_Sodium_Core_Poly1305
+{
+
+}
diff --git a/vendor/paragonie/sodium_compat/namespaced/Core/Poly1305/State.php b/vendor/paragonie/sodium_compat/namespaced/Core/Poly1305/State.php
new file mode 100644
index 0000000..a0648e7
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/namespaced/Core/Poly1305/State.php
@@ -0,0 +1,7 @@
+<?php
+namespace ParagonIE\Sodium\Core\Poly1305;
+
+class State extends \ParagonIE_Sodium_Core_Poly1305_State
+{
+
+}
diff --git a/vendor/paragonie/sodium_compat/namespaced/Core/Salsa20.php b/vendor/paragonie/sodium_compat/namespaced/Core/Salsa20.php
new file mode 100644
index 0000000..a611239
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/namespaced/Core/Salsa20.php
@@ -0,0 +1,7 @@
+<?php
+namespace ParagonIE\Sodium\Core;
+
+class Salsa20 extends \ParagonIE_Sodium_Core_Salsa20
+{
+
+}
diff --git a/vendor/paragonie/sodium_compat/namespaced/Core/SipHash.php b/vendor/paragonie/sodium_compat/namespaced/Core/SipHash.php
new file mode 100644
index 0000000..4570904
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/namespaced/Core/SipHash.php
@@ -0,0 +1,7 @@
+<?php
+namespace ParagonIE\Sodium\Core;
+
+class SipHash extends \ParagonIE_Sodium_Core_SipHash
+{
+
+}
diff --git a/vendor/paragonie/sodium_compat/namespaced/Core/Util.php b/vendor/paragonie/sodium_compat/namespaced/Core/Util.php
new file mode 100644
index 0000000..6086a36
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/namespaced/Core/Util.php
@@ -0,0 +1,7 @@
+<?php
+namespace ParagonIE\Sodium\Core;
+
+class Util extends \ParagonIE_Sodium_Core_Util
+{
+
+}
diff --git a/vendor/paragonie/sodium_compat/namespaced/Core/X25519.php b/vendor/paragonie/sodium_compat/namespaced/Core/X25519.php
new file mode 100644
index 0000000..f17a2cf
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/namespaced/Core/X25519.php
@@ -0,0 +1,7 @@
+<?php
+namespace ParagonIE\Sodium\Core;
+
+class X25519 extends \ParagonIE_Sodium_Core_X25519
+{
+
+}
diff --git a/vendor/paragonie/sodium_compat/namespaced/Core/XChaCha20.php b/vendor/paragonie/sodium_compat/namespaced/Core/XChaCha20.php
new file mode 100644
index 0000000..51b5535
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/namespaced/Core/XChaCha20.php
@@ -0,0 +1,7 @@
+<?php
+namespace ParagonIE\Sodium\Core;
+
+class XChaCha20 extends \ParagonIE_Sodium_Core_XChaCha20
+{
+
+}
diff --git a/vendor/paragonie/sodium_compat/namespaced/Core/Xsalsa20.php b/vendor/paragonie/sodium_compat/namespaced/Core/Xsalsa20.php
new file mode 100644
index 0000000..5297e49
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/namespaced/Core/Xsalsa20.php
@@ -0,0 +1,7 @@
+<?php
+namespace ParagonIE\Sodium\Core;
+
+class Xsalsa20 extends \ParagonIE_Sodium_Core_XSalsa20
+{
+
+}
diff --git a/vendor/paragonie/sodium_compat/namespaced/Crypto.php b/vendor/paragonie/sodium_compat/namespaced/Crypto.php
new file mode 100644
index 0000000..78f092d
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/namespaced/Crypto.php
@@ -0,0 +1,7 @@
+<?php
+namespace ParagonIE\Sodium;
+
+class Crypto extends \ParagonIE_Sodium_Crypto
+{
+
+}
diff --git a/vendor/paragonie/sodium_compat/namespaced/File.php b/vendor/paragonie/sodium_compat/namespaced/File.php
new file mode 100644
index 0000000..6b40459
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/namespaced/File.php
@@ -0,0 +1,7 @@
+<?php
+namespace ParagonIE\Sodium;
+
+class File extends \ParagonIE_Sodium_File
+{
+
+}
diff --git a/vendor/paragonie/sodium_compat/phpunit.xml.dist b/vendor/paragonie/sodium_compat/phpunit.xml.dist
new file mode 100644
index 0000000..a705527
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/phpunit.xml.dist
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" backupGlobals="true" backupStaticAttributes="false" bootstrap="autoload-phpunit.php" colors="true" convertErrorsToExceptions="true" convertNoticesToExceptions="true" convertWarningsToExceptions="true" processIsolation="false" stopOnError="false" stopOnFailure="false" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd">
+  <coverage processUncoveredFiles="true">
+    <include>
+      <directory suffix=".php">./src</directory>
+    </include>
+  </coverage>
+  <testsuites>
+    <testsuite name="Unit Tests">
+      <directory suffix="Test.php">./tests/unit</directory>
+    </testsuite>
+    <testsuite name="Libsodium Compatibility Tests">
+      <directory suffix="Test.php">./tests/compat</directory>
+    </testsuite>
+  </testsuites>
+</phpunit>
diff --git a/vendor/paragonie/sodium_compat/psalm-above-3.xml b/vendor/paragonie/sodium_compat/psalm-above-3.xml
new file mode 100644
index 0000000..63b8c80
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/psalm-above-3.xml
@@ -0,0 +1,57 @@
+<?xml version="1.0"?>
+<psalm
+        useDocblockTypes="true"
+        totallyTyped="true"
+>
+    <projectFiles>
+        <directory name="src" />
+    </projectFiles>
+    <issueHandlers>
+        <InvalidFunctionCall errorLevel="suppress" />
+        <!--
+            Previous issue type is suppressed because we have to use a string
+            as a function name for PHP 5.2 compatibility. When testing, be sure
+            to change this to "info".
+         -->
+
+        <UndefinedFunction errorLevel="info" />
+        <!--
+            Inconsistently erroneous.
+        -->
+
+        <DuplicateClass errorLevel="info" />
+        <!--
+            Psalm isn't correctly identifying the guard conditions that return
+            early if a class already exists.
+        -->
+        <RedundantConditionGivenDocblockType errorLevel="suppress" />
+
+        <TooFewArguments errorLevel="info" />
+
+        <DocblockTypeContradiction errorLevel="suppress" />
+        <RedundantCondition errorLevel="info" />
+        <!--
+            Redundancy is good for PHP <7
+        -->
+
+        <TypeDoesNotContainType errorLevel="info" />
+        <!--
+            This mostly fails on `PHP_INT_SIZE === 4`
+        -->
+
+        <InternalMethod errorLevel="suppress" />
+        <!--
+            We mark methods as internal.
+        -->
+        <PossiblyNullArgument errorLevel="suppress" />
+        <!--
+            Not interesting
+        -->
+
+        <RedundantCast errorLevel="info" />
+        <UnnecessaryVarAnnotation errorLevel="suppress" />
+        <UnusedVariable errorLevel="info" />
+        <UnusedFunctionCall errorLevel="info" />
+
+    </issueHandlers>
+</psalm>
diff --git a/vendor/paragonie/sodium_compat/psalm-below-3.xml b/vendor/paragonie/sodium_compat/psalm-below-3.xml
new file mode 100644
index 0000000..0da3cd9
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/psalm-below-3.xml
@@ -0,0 +1,43 @@
+<?xml version="1.0"?>
+<psalm
+    useDocblockTypes="true"
+    totallyTyped="true"
+>
+    <projectFiles>
+        <directory name="src" />
+    </projectFiles>
+    <issueHandlers>
+        <InvalidFunctionCall errorLevel="suppress" />
+        <!--
+            Previous issue type is suppressed because we have to use a string
+            as a function name for PHP 5.2 compatibility. When testing, be sure
+            to change this to "info".
+         -->
+
+        <UndefinedFunction errorLevel="info" />
+        <!--
+            Inconsistently erroneous.
+        -->
+
+        <DuplicateClass errorLevel="info" />
+        <!--
+            Psalm isn't correctly identifying the guard conditions that return
+            early if a class already exists.
+        -->
+        <RedundantConditionGivenDocblockType errorLevel="suppress" />
+
+        <TooFewArguments errorLevel="info" />
+
+        <DocblockTypeContradiction errorLevel="info" />
+        <RedundantCondition errorLevel="info" />
+        <!--
+            Redundancy is good for PHP <7
+        -->
+
+        <TypeDoesNotContainType errorLevel="info" />
+        <!--
+            This mostly fails on `PHP_INT_SIZE === 4`
+        -->
+
+    </issueHandlers>
+</psalm>
diff --git a/vendor/paragonie/sodium_compat/src/Compat.php b/vendor/paragonie/sodium_compat/src/Compat.php
new file mode 100644
index 0000000..286d37e
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Compat.php
@@ -0,0 +1,3947 @@
+<?php
+
+/**
+ * Libsodium compatibility layer
+ *
+ * This is the only class you should be interfacing with, as a user of
+ * sodium_compat.
+ *
+ * If the PHP extension for libsodium is installed, it will always use that
+ * instead of our implementations. You get better performance and stronger
+ * guarantees against side-channels that way.
+ *
+ * However, if your users don't have the PHP extension installed, we offer a
+ * compatible interface here. It will give you the correct results as if the
+ * PHP extension was installed. It won't be as fast, of course.
+ *
+ * CAUTION * CAUTION * CAUTION * CAUTION * CAUTION * CAUTION * CAUTION * CAUTION *
+ *                                                                               *
+ *     Until audited, this is probably not safe to use! DANGER WILL ROBINSON     *
+ *                                                                               *
+ * CAUTION * CAUTION * CAUTION * CAUTION * CAUTION * CAUTION * CAUTION * CAUTION *
+ */
+
+if (class_exists('ParagonIE_Sodium_Compat', false)) {
+    return;
+}
+
+class ParagonIE_Sodium_Compat
+{
+    /**
+     * This parameter prevents the use of the PECL extension.
+     * It should only be used for unit testing.
+     *
+     * @var bool
+     */
+    public static $disableFallbackForUnitTests = false;
+
+    /**
+     * Use fast multiplication rather than our constant-time multiplication
+     * implementation. Can be enabled at runtime. Only enable this if you
+     * are absolutely certain that there is no timing leak on your platform.
+     *
+     * @var bool
+     */
+    public static $fastMult = false;
+
+    const LIBRARY_MAJOR_VERSION = 9;
+    const LIBRARY_MINOR_VERSION = 1;
+    const LIBRARY_VERSION_MAJOR = 9;
+    const LIBRARY_VERSION_MINOR = 1;
+    const VERSION_STRING = 'polyfill-1.0.8';
+
+    // From libsodium
+    const BASE64_VARIANT_ORIGINAL = 1;
+    const BASE64_VARIANT_ORIGINAL_NO_PADDING = 3;
+    const BASE64_VARIANT_URLSAFE = 5;
+    const BASE64_VARIANT_URLSAFE_NO_PADDING = 7;
+    const CRYPTO_AEAD_AES256GCM_KEYBYTES = 32;
+    const CRYPTO_AEAD_AES256GCM_NSECBYTES = 0;
+    const CRYPTO_AEAD_AES256GCM_NPUBBYTES = 12;
+    const CRYPTO_AEAD_AES256GCM_ABYTES = 16;
+    const CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES = 32;
+    const CRYPTO_AEAD_CHACHA20POLY1305_NSECBYTES = 0;
+    const CRYPTO_AEAD_CHACHA20POLY1305_NPUBBYTES = 8;
+    const CRYPTO_AEAD_CHACHA20POLY1305_ABYTES = 16;
+    const CRYPTO_AEAD_CHACHA20POLY1305_IETF_KEYBYTES = 32;
+    const CRYPTO_AEAD_CHACHA20POLY1305_IETF_NSECBYTES = 0;
+    const CRYPTO_AEAD_CHACHA20POLY1305_IETF_NPUBBYTES = 12;
+    const CRYPTO_AEAD_CHACHA20POLY1305_IETF_ABYTES = 16;
+    const CRYPTO_AEAD_XCHACHA20POLY1305_IETF_KEYBYTES = 32;
+    const CRYPTO_AEAD_XCHACHA20POLY1305_IETF_NSECBYTES = 0;
+    const CRYPTO_AEAD_XCHACHA20POLY1305_IETF_NPUBBYTES = 24;
+    const CRYPTO_AEAD_XCHACHA20POLY1305_IETF_ABYTES = 16;
+    const CRYPTO_AUTH_BYTES = 32;
+    const CRYPTO_AUTH_KEYBYTES = 32;
+    const CRYPTO_BOX_SEALBYTES = 16;
+    const CRYPTO_BOX_SECRETKEYBYTES = 32;
+    const CRYPTO_BOX_PUBLICKEYBYTES = 32;
+    const CRYPTO_BOX_KEYPAIRBYTES = 64;
+    const CRYPTO_BOX_MACBYTES = 16;
+    const CRYPTO_BOX_NONCEBYTES = 24;
+    const CRYPTO_BOX_SEEDBYTES = 32;
+    const CRYPTO_CORE_RISTRETTO255_BYTES = 32;
+    const CRYPTO_CORE_RISTRETTO255_SCALARBYTES = 32;
+    const CRYPTO_CORE_RISTRETTO255_HASHBYTES = 64;
+    const CRYPTO_CORE_RISTRETTO255_NONREDUCEDSCALARBYTES = 64;
+    const CRYPTO_KDF_BYTES_MIN = 16;
+    const CRYPTO_KDF_BYTES_MAX = 64;
+    const CRYPTO_KDF_CONTEXTBYTES = 8;
+    const CRYPTO_KDF_KEYBYTES = 32;
+    const CRYPTO_KX_BYTES = 32;
+    const CRYPTO_KX_PRIMITIVE = 'x25519blake2b';
+    const CRYPTO_KX_SEEDBYTES = 32;
+    const CRYPTO_KX_KEYPAIRBYTES = 64;
+    const CRYPTO_KX_PUBLICKEYBYTES = 32;
+    const CRYPTO_KX_SECRETKEYBYTES = 32;
+    const CRYPTO_KX_SESSIONKEYBYTES = 32;
+    const CRYPTO_GENERICHASH_BYTES = 32;
+    const CRYPTO_GENERICHASH_BYTES_MIN = 16;
+    const CRYPTO_GENERICHASH_BYTES_MAX = 64;
+    const CRYPTO_GENERICHASH_KEYBYTES = 32;
+    const CRYPTO_GENERICHASH_KEYBYTES_MIN = 16;
+    const CRYPTO_GENERICHASH_KEYBYTES_MAX = 64;
+    const CRYPTO_PWHASH_SALTBYTES = 16;
+    const CRYPTO_PWHASH_STRPREFIX = '$argon2id$';
+    const CRYPTO_PWHASH_ALG_ARGON2I13 = 1;
+    const CRYPTO_PWHASH_ALG_ARGON2ID13 = 2;
+    const CRYPTO_PWHASH_MEMLIMIT_INTERACTIVE = 33554432;
+    const CRYPTO_PWHASH_OPSLIMIT_INTERACTIVE = 4;
+    const CRYPTO_PWHASH_MEMLIMIT_MODERATE = 134217728;
+    const CRYPTO_PWHASH_OPSLIMIT_MODERATE = 6;
+    const CRYPTO_PWHASH_MEMLIMIT_SENSITIVE = 536870912;
+    const CRYPTO_PWHASH_OPSLIMIT_SENSITIVE = 8;
+    const CRYPTO_PWHASH_SCRYPTSALSA208SHA256_SALTBYTES = 32;
+    const CRYPTO_PWHASH_SCRYPTSALSA208SHA256_STRPREFIX = '$7$';
+    const CRYPTO_PWHASH_SCRYPTSALSA208SHA256_OPSLIMIT_INTERACTIVE = 534288;
+    const CRYPTO_PWHASH_SCRYPTSALSA208SHA256_MEMLIMIT_INTERACTIVE = 16777216;
+    const CRYPTO_PWHASH_SCRYPTSALSA208SHA256_OPSLIMIT_SENSITIVE = 33554432;
+    const CRYPTO_PWHASH_SCRYPTSALSA208SHA256_MEMLIMIT_SENSITIVE = 1073741824;
+    const CRYPTO_SCALARMULT_BYTES = 32;
+    const CRYPTO_SCALARMULT_SCALARBYTES = 32;
+    const CRYPTO_SCALARMULT_RISTRETTO255_BYTES = 32;
+    const CRYPTO_SCALARMULT_RISTRETTO255_SCALARBYTES = 32;
+    const CRYPTO_SHORTHASH_BYTES = 8;
+    const CRYPTO_SHORTHASH_KEYBYTES = 16;
+    const CRYPTO_SECRETBOX_KEYBYTES = 32;
+    const CRYPTO_SECRETBOX_MACBYTES = 16;
+    const CRYPTO_SECRETBOX_NONCEBYTES = 24;
+    const CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_ABYTES = 17;
+    const CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_HEADERBYTES = 24;
+    const CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_KEYBYTES = 32;
+    const CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_TAG_PUSH = 0;
+    const CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_TAG_PULL = 1;
+    const CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_TAG_REKEY = 2;
+    const CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_TAG_FINAL = 3;
+    const CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_MESSAGEBYTES_MAX = 0x3fffffff80;
+    const CRYPTO_SIGN_BYTES = 64;
+    const CRYPTO_SIGN_SEEDBYTES = 32;
+    const CRYPTO_SIGN_PUBLICKEYBYTES = 32;
+    const CRYPTO_SIGN_SECRETKEYBYTES = 64;
+    const CRYPTO_SIGN_KEYPAIRBYTES = 96;
+    const CRYPTO_STREAM_KEYBYTES = 32;
+    const CRYPTO_STREAM_NONCEBYTES = 24;
+    const CRYPTO_STREAM_XCHACHA20_KEYBYTES = 32;
+    const CRYPTO_STREAM_XCHACHA20_NONCEBYTES = 24;
+
+    /**
+     * Add two numbers (little-endian unsigned), storing the value in the first
+     * parameter.
+     *
+     * This mutates $val.
+     *
+     * @param string $val
+     * @param string $addv
+     * @return void
+     * @throws SodiumException
+     */
+    public static function add(&$val, $addv)
+    {
+        $val_len = ParagonIE_Sodium_Core_Util::strlen($val);
+        $addv_len = ParagonIE_Sodium_Core_Util::strlen($addv);
+        if ($val_len !== $addv_len) {
+            throw new SodiumException('values must have the same length');
+        }
+        $A = ParagonIE_Sodium_Core_Util::stringToIntArray($val);
+        $B = ParagonIE_Sodium_Core_Util::stringToIntArray($addv);
+
+        $c = 0;
+        for ($i = 0; $i < $val_len; $i++) {
+            $c += ($A[$i] + $B[$i]);
+            $A[$i] = ($c & 0xff);
+            $c >>= 8;
+        }
+        $val = ParagonIE_Sodium_Core_Util::intArrayToString($A);
+    }
+
+    /**
+     * @param string $encoded
+     * @param int $variant
+     * @param string $ignore
+     * @return string
+     * @throws SodiumException
+     */
+    public static function base642bin($encoded, $variant, $ignore = '')
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($encoded, 'string', 1);
+
+        /** @var string $encoded */
+        $encoded = (string) $encoded;
+        if (ParagonIE_Sodium_Core_Util::strlen($encoded) === 0) {
+            return '';
+        }
+
+        // Just strip before decoding
+        if (!empty($ignore)) {
+            $encoded = str_replace($ignore, '', $encoded);
+        }
+
+        try {
+            switch ($variant) {
+                case self::BASE64_VARIANT_ORIGINAL:
+                    return ParagonIE_Sodium_Core_Base64_Original::decode($encoded, true);
+                case self::BASE64_VARIANT_ORIGINAL_NO_PADDING:
+                    return ParagonIE_Sodium_Core_Base64_Original::decode($encoded, false);
+                case self::BASE64_VARIANT_URLSAFE:
+                    return ParagonIE_Sodium_Core_Base64_UrlSafe::decode($encoded, true);
+                case self::BASE64_VARIANT_URLSAFE_NO_PADDING:
+                    return ParagonIE_Sodium_Core_Base64_UrlSafe::decode($encoded, false);
+                default:
+                    throw new SodiumException('invalid base64 variant identifier');
+            }
+        } catch (Exception $ex) {
+            if ($ex instanceof SodiumException) {
+                throw $ex;
+            }
+            throw new SodiumException('invalid base64 string');
+        }
+    }
+
+    /**
+     * @param string $decoded
+     * @param int $variant
+     * @return string
+     * @throws SodiumException
+     */
+    public static function bin2base64($decoded, $variant)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($decoded, 'string', 1);
+        /** @var string $decoded */
+        $decoded = (string) $decoded;
+        if (ParagonIE_Sodium_Core_Util::strlen($decoded) === 0) {
+            return '';
+        }
+
+        switch ($variant) {
+            case self::BASE64_VARIANT_ORIGINAL:
+                return ParagonIE_Sodium_Core_Base64_Original::encode($decoded);
+            case self::BASE64_VARIANT_ORIGINAL_NO_PADDING:
+                return ParagonIE_Sodium_Core_Base64_Original::encodeUnpadded($decoded);
+            case self::BASE64_VARIANT_URLSAFE:
+                return ParagonIE_Sodium_Core_Base64_UrlSafe::encode($decoded);
+            case self::BASE64_VARIANT_URLSAFE_NO_PADDING:
+                return ParagonIE_Sodium_Core_Base64_UrlSafe::encodeUnpadded($decoded);
+            default:
+                throw new SodiumException('invalid base64 variant identifier');
+        }
+    }
+
+    /**
+     * Cache-timing-safe implementation of bin2hex().
+     *
+     * @param string $string A string (probably raw binary)
+     * @return string        A hexadecimal-encoded string
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function bin2hex($string)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($string, 'string', 1);
+
+        if (self::useNewSodiumAPI()) {
+            return (string) sodium_bin2hex($string);
+        }
+        if (self::use_fallback('bin2hex')) {
+            return (string) call_user_func('\\Sodium\\bin2hex', $string);
+        }
+        return ParagonIE_Sodium_Core_Util::bin2hex($string);
+    }
+
+    /**
+     * Compare two strings, in constant-time.
+     * Compared to memcmp(), compare() is more useful for sorting.
+     *
+     * @param string $left  The left operand; must be a string
+     * @param string $right The right operand; must be a string
+     * @return int          If < 0 if the left operand is less than the right
+     *                      If = 0 if both strings are equal
+     *                      If > 0 if the right operand is less than the left
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function compare($left, $right)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($left, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($right, 'string', 2);
+
+        if (self::useNewSodiumAPI()) {
+            return (int) sodium_compare($left, $right);
+        }
+        if (self::use_fallback('compare')) {
+            return (int) call_user_func('\\Sodium\\compare', $left, $right);
+        }
+        return ParagonIE_Sodium_Core_Util::compare($left, $right);
+    }
+
+    /**
+     * Is AES-256-GCM even available to use?
+     *
+     * @return bool
+     * @psalm-suppress UndefinedFunction
+     * @psalm-suppress MixedInferredReturnType
+     * @psalm-suppress MixedReturnStatement
+     */
+    public static function crypto_aead_aes256gcm_is_available()
+    {
+        if (self::useNewSodiumAPI()) {
+            return sodium_crypto_aead_aes256gcm_is_available();
+        }
+        if (self::use_fallback('crypto_aead_aes256gcm_is_available')) {
+            return call_user_func('\\Sodium\\crypto_aead_aes256gcm_is_available');
+        }
+        if (PHP_VERSION_ID < 70100) {
+            // OpenSSL doesn't support AEAD before 7.1.0
+            return false;
+        }
+        if (!is_callable('openssl_encrypt') || !is_callable('openssl_decrypt')) {
+            // OpenSSL isn't installed
+            return false;
+        }
+        return (bool) in_array('aes-256-gcm', openssl_get_cipher_methods());
+    }
+
+    /**
+     * Authenticated Encryption with Associated Data: Decryption
+     *
+     * Algorithm:
+     *     AES-256-GCM
+     *
+     * This mode uses a 64-bit random nonce with a 64-bit counter.
+     * IETF mode uses a 96-bit random nonce with a 32-bit counter.
+     *
+     * @param string $ciphertext Encrypted message (with Poly1305 MAC appended)
+     * @param string $assocData  Authenticated Associated Data (unencrypted)
+     * @param string $nonce      Number to be used only Once; must be 8 bytes
+     * @param string $key        Encryption key
+     *
+     * @return string|bool       The original plaintext message
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     * @psalm-suppress MixedInferredReturnType
+     * @psalm-suppress MixedReturnStatement
+     */
+    public static function crypto_aead_aes256gcm_decrypt(
+        $ciphertext = '',
+        $assocData = '',
+        $nonce = '',
+        $key = ''
+    ) {
+        if (!self::crypto_aead_aes256gcm_is_available()) {
+            throw new SodiumException('AES-256-GCM is not available');
+        }
+        ParagonIE_Sodium_Core_Util::declareScalarType($ciphertext, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($assocData, 'string', 2);
+        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 3);
+        ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 4);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_AES256GCM_NPUBBYTES) {
+            throw new SodiumException('Nonce must be CRYPTO_AEAD_AES256GCM_NPUBBYTES long');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_AES256GCM_KEYBYTES) {
+            throw new SodiumException('Key must be CRYPTO_AEAD_AES256GCM_KEYBYTES long');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($ciphertext) < self::CRYPTO_AEAD_AES256GCM_ABYTES) {
+            throw new SodiumException('Message must be at least CRYPTO_AEAD_AES256GCM_ABYTES long');
+        }
+        if (!is_callable('openssl_decrypt')) {
+            throw new SodiumException('The OpenSSL extension is not installed, or openssl_decrypt() is not available');
+        }
+
+        /** @var string $ctext */
+        $ctext = ParagonIE_Sodium_Core_Util::substr($ciphertext, 0, -self::CRYPTO_AEAD_AES256GCM_ABYTES);
+        /** @var string $authTag */
+        $authTag = ParagonIE_Sodium_Core_Util::substr($ciphertext, -self::CRYPTO_AEAD_AES256GCM_ABYTES, 16);
+        return openssl_decrypt(
+            $ctext,
+            'aes-256-gcm',
+            $key,
+            OPENSSL_RAW_DATA,
+            $nonce,
+            $authTag,
+            $assocData
+        );
+    }
+
+    /**
+     * Authenticated Encryption with Associated Data: Encryption
+     *
+     * Algorithm:
+     *     AES-256-GCM
+     *
+     * @param string $plaintext Message to be encrypted
+     * @param string $assocData Authenticated Associated Data (unencrypted)
+     * @param string $nonce     Number to be used only Once; must be 8 bytes
+     * @param string $key       Encryption key
+     *
+     * @return string           Ciphertext with a 16-byte GCM message
+     *                          authentication code appended
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_aead_aes256gcm_encrypt(
+        $plaintext = '',
+        $assocData = '',
+        $nonce = '',
+        $key = ''
+    ) {
+        if (!self::crypto_aead_aes256gcm_is_available()) {
+            throw new SodiumException('AES-256-GCM is not available');
+        }
+        ParagonIE_Sodium_Core_Util::declareScalarType($plaintext, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($assocData, 'string', 2);
+        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 3);
+        ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 4);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_AES256GCM_NPUBBYTES) {
+            throw new SodiumException('Nonce must be CRYPTO_AEAD_AES256GCM_NPUBBYTES long');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_AES256GCM_KEYBYTES) {
+            throw new SodiumException('Key must be CRYPTO_AEAD_AES256GCM_KEYBYTES long');
+        }
+
+        if (!is_callable('openssl_encrypt')) {
+            throw new SodiumException('The OpenSSL extension is not installed, or openssl_encrypt() is not available');
+        }
+
+        $authTag = '';
+        $ciphertext = openssl_encrypt(
+            $plaintext,
+            'aes-256-gcm',
+            $key,
+            OPENSSL_RAW_DATA,
+            $nonce,
+            $authTag,
+            $assocData
+        );
+        return $ciphertext . $authTag;
+    }
+
+    /**
+     * Return a secure random key for use with the AES-256-GCM
+     * symmetric AEAD interface.
+     *
+     * @return string
+     * @throws Exception
+     * @throws Error
+     */
+    public static function crypto_aead_aes256gcm_keygen()
+    {
+        return random_bytes(self::CRYPTO_AEAD_AES256GCM_KEYBYTES);
+    }
+
+    /**
+     * Authenticated Encryption with Associated Data: Decryption
+     *
+     * Algorithm:
+     *     ChaCha20-Poly1305
+     *
+     * This mode uses a 64-bit random nonce with a 64-bit counter.
+     * IETF mode uses a 96-bit random nonce with a 32-bit counter.
+     *
+     * @param string $ciphertext Encrypted message (with Poly1305 MAC appended)
+     * @param string $assocData  Authenticated Associated Data (unencrypted)
+     * @param string $nonce      Number to be used only Once; must be 8 bytes
+     * @param string $key        Encryption key
+     *
+     * @return string            The original plaintext message
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     * @psalm-suppress MixedInferredReturnType
+     * @psalm-suppress MixedReturnStatement
+     */
+    public static function crypto_aead_chacha20poly1305_decrypt(
+        $ciphertext = '',
+        $assocData = '',
+        $nonce = '',
+        $key = ''
+    ) {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($ciphertext, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($assocData, 'string', 2);
+        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 3);
+        ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 4);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_CHACHA20POLY1305_NPUBBYTES) {
+            throw new SodiumException('Nonce must be CRYPTO_AEAD_CHACHA20POLY1305_NPUBBYTES long');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES) {
+            throw new SodiumException('Key must be CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES long');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($ciphertext) < self::CRYPTO_AEAD_CHACHA20POLY1305_ABYTES) {
+            throw new SodiumException('Message must be at least CRYPTO_AEAD_CHACHA20POLY1305_ABYTES long');
+        }
+
+        if (self::useNewSodiumAPI()) {
+            /**
+             * @psalm-suppress InvalidReturnStatement
+             * @psalm-suppress FalsableReturnStatement
+             */
+            return sodium_crypto_aead_chacha20poly1305_decrypt(
+                $ciphertext,
+                $assocData,
+                $nonce,
+                $key
+            );
+        }
+        if (self::use_fallback('crypto_aead_chacha20poly1305_decrypt')) {
+            return call_user_func(
+                '\\Sodium\\crypto_aead_chacha20poly1305_decrypt',
+                $ciphertext,
+                $assocData,
+                $nonce,
+                $key
+            );
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::aead_chacha20poly1305_decrypt(
+                $ciphertext,
+                $assocData,
+                $nonce,
+                $key
+            );
+        }
+        return ParagonIE_Sodium_Crypto::aead_chacha20poly1305_decrypt(
+            $ciphertext,
+            $assocData,
+            $nonce,
+            $key
+        );
+    }
+
+    /**
+     * Authenticated Encryption with Associated Data
+     *
+     * Algorithm:
+     *     ChaCha20-Poly1305
+     *
+     * This mode uses a 64-bit random nonce with a 64-bit counter.
+     * IETF mode uses a 96-bit random nonce with a 32-bit counter.
+     *
+     * @param string $plaintext Message to be encrypted
+     * @param string $assocData Authenticated Associated Data (unencrypted)
+     * @param string $nonce     Number to be used only Once; must be 8 bytes
+     * @param string $key       Encryption key
+     *
+     * @return string           Ciphertext with a 16-byte Poly1305 message
+     *                          authentication code appended
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_aead_chacha20poly1305_encrypt(
+        $plaintext = '',
+        $assocData = '',
+        $nonce = '',
+        $key = ''
+    ) {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($plaintext, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($assocData, 'string', 2);
+        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 3);
+        ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 4);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_CHACHA20POLY1305_NPUBBYTES) {
+            throw new SodiumException('Nonce must be CRYPTO_AEAD_CHACHA20POLY1305_NPUBBYTES long');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES) {
+            throw new SodiumException('Key must be CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES long');
+        }
+
+        if (self::useNewSodiumAPI()) {
+            return (string) sodium_crypto_aead_chacha20poly1305_encrypt(
+                $plaintext,
+                $assocData,
+                $nonce,
+                $key
+            );
+        }
+        if (self::use_fallback('crypto_aead_chacha20poly1305_encrypt')) {
+            return (string) call_user_func(
+                '\\Sodium\\crypto_aead_chacha20poly1305_encrypt',
+                $plaintext,
+                $assocData,
+                $nonce,
+                $key
+            );
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::aead_chacha20poly1305_encrypt(
+                $plaintext,
+                $assocData,
+                $nonce,
+                $key
+            );
+        }
+        return ParagonIE_Sodium_Crypto::aead_chacha20poly1305_encrypt(
+            $plaintext,
+            $assocData,
+            $nonce,
+            $key
+        );
+    }
+
+    /**
+     * Authenticated Encryption with Associated Data: Decryption
+     *
+     * Algorithm:
+     *     ChaCha20-Poly1305
+     *
+     * IETF mode uses a 96-bit random nonce with a 32-bit counter.
+     * Regular mode uses a 64-bit random nonce with a 64-bit counter.
+     *
+     * @param string $ciphertext Encrypted message (with Poly1305 MAC appended)
+     * @param string $assocData  Authenticated Associated Data (unencrypted)
+     * @param string $nonce      Number to be used only Once; must be 12 bytes
+     * @param string $key        Encryption key
+     *
+     * @return string            The original plaintext message
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     * @psalm-suppress MixedInferredReturnType
+     * @psalm-suppress MixedReturnStatement
+     */
+    public static function crypto_aead_chacha20poly1305_ietf_decrypt(
+        $ciphertext = '',
+        $assocData = '',
+        $nonce = '',
+        $key = ''
+    ) {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($ciphertext, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($assocData, 'string', 2);
+        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 3);
+        ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 4);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_CHACHA20POLY1305_IETF_NPUBBYTES) {
+            throw new SodiumException('Nonce must be CRYPTO_AEAD_CHACHA20POLY1305_IETF_NPUBBYTES long');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES) {
+            throw new SodiumException('Key must be CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES long');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($ciphertext) < self::CRYPTO_AEAD_CHACHA20POLY1305_ABYTES) {
+            throw new SodiumException('Message must be at least CRYPTO_AEAD_CHACHA20POLY1305_ABYTES long');
+        }
+
+        if (self::useNewSodiumAPI()) {
+            /**
+             * @psalm-suppress InvalidReturnStatement
+             * @psalm-suppress FalsableReturnStatement
+             */
+            return sodium_crypto_aead_chacha20poly1305_ietf_decrypt(
+                $ciphertext,
+                $assocData,
+                $nonce,
+                $key
+            );
+        }
+        if (self::use_fallback('crypto_aead_chacha20poly1305_ietf_decrypt')) {
+            return call_user_func(
+                '\\Sodium\\crypto_aead_chacha20poly1305_ietf_decrypt',
+                $ciphertext,
+                $assocData,
+                $nonce,
+                $key
+            );
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::aead_chacha20poly1305_ietf_decrypt(
+                $ciphertext,
+                $assocData,
+                $nonce,
+                $key
+            );
+        }
+        return ParagonIE_Sodium_Crypto::aead_chacha20poly1305_ietf_decrypt(
+            $ciphertext,
+            $assocData,
+            $nonce,
+            $key
+        );
+    }
+
+    /**
+     * Return a secure random key for use with the ChaCha20-Poly1305
+     * symmetric AEAD interface.
+     *
+     * @return string
+     * @throws Exception
+     * @throws Error
+     */
+    public static function crypto_aead_chacha20poly1305_keygen()
+    {
+        return random_bytes(self::CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES);
+    }
+
+    /**
+     * Authenticated Encryption with Associated Data
+     *
+     * Algorithm:
+     *     ChaCha20-Poly1305
+     *
+     * IETF mode uses a 96-bit random nonce with a 32-bit counter.
+     * Regular mode uses a 64-bit random nonce with a 64-bit counter.
+     *
+     * @param string $plaintext Message to be encrypted
+     * @param string $assocData Authenticated Associated Data (unencrypted)
+     * @param string $nonce Number to be used only Once; must be 8 bytes
+     * @param string $key Encryption key
+     *
+     * @return string           Ciphertext with a 16-byte Poly1305 message
+     *                          authentication code appended
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_aead_chacha20poly1305_ietf_encrypt(
+        $plaintext = '',
+        $assocData = '',
+        $nonce = '',
+        $key = ''
+    ) {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($plaintext, 'string', 1);
+        if (!is_null($assocData)) {
+            ParagonIE_Sodium_Core_Util::declareScalarType($assocData, 'string', 2);
+        }
+        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 3);
+        ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 4);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_CHACHA20POLY1305_IETF_NPUBBYTES) {
+            throw new SodiumException('Nonce must be CRYPTO_AEAD_CHACHA20POLY1305_IETF_NPUBBYTES long');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES) {
+            throw new SodiumException('Key must be CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES long');
+        }
+
+        if (self::useNewSodiumAPI()) {
+            return (string) sodium_crypto_aead_chacha20poly1305_ietf_encrypt(
+                $plaintext,
+                $assocData,
+                $nonce,
+                $key
+            );
+        }
+        if (self::use_fallback('crypto_aead_chacha20poly1305_ietf_encrypt')) {
+            return (string) call_user_func(
+                '\\Sodium\\crypto_aead_chacha20poly1305_ietf_encrypt',
+                $plaintext,
+                $assocData,
+                $nonce,
+                $key
+            );
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::aead_chacha20poly1305_ietf_encrypt(
+                $plaintext,
+                $assocData,
+                $nonce,
+                $key
+            );
+        }
+        return ParagonIE_Sodium_Crypto::aead_chacha20poly1305_ietf_encrypt(
+            $plaintext,
+            $assocData,
+            $nonce,
+            $key
+        );
+    }
+
+    /**
+     * Return a secure random key for use with the ChaCha20-Poly1305
+     * symmetric AEAD interface. (IETF version)
+     *
+     * @return string
+     * @throws Exception
+     * @throws Error
+     */
+    public static function crypto_aead_chacha20poly1305_ietf_keygen()
+    {
+        return random_bytes(self::CRYPTO_AEAD_CHACHA20POLY1305_IETF_KEYBYTES);
+    }
+
+    /**
+     * Authenticated Encryption with Associated Data: Decryption
+     *
+     * Algorithm:
+     *     XChaCha20-Poly1305
+     *
+     * This mode uses a 64-bit random nonce with a 64-bit counter.
+     * IETF mode uses a 96-bit random nonce with a 32-bit counter.
+     *
+     * @param string $ciphertext   Encrypted message (with Poly1305 MAC appended)
+     * @param string $assocData    Authenticated Associated Data (unencrypted)
+     * @param string $nonce        Number to be used only Once; must be 8 bytes
+     * @param string $key          Encryption key
+     * @param bool   $dontFallback Don't fallback to ext/sodium
+     *
+     * @return string|bool         The original plaintext message
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_aead_xchacha20poly1305_ietf_decrypt(
+        $ciphertext = '',
+        $assocData = '',
+        $nonce = '',
+        $key = '',
+        $dontFallback = false
+    ) {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($ciphertext, 'string', 1);
+        if (!is_null($assocData)) {
+            ParagonIE_Sodium_Core_Util::declareScalarType($assocData, 'string', 2);
+        } else {
+            $assocData = '';
+        }
+        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 3);
+        ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 4);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_XCHACHA20POLY1305_IETF_NPUBBYTES) {
+            throw new SodiumException('Nonce must be CRYPTO_AEAD_XCHACHA20POLY1305_IETF_NPUBBYTES long');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_XCHACHA20POLY1305_IETF_KEYBYTES) {
+            throw new SodiumException('Key must be CRYPTO_AEAD_XCHACHA20POLY1305_IETF_KEYBYTES long');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($ciphertext) < self::CRYPTO_AEAD_XCHACHA20POLY1305_IETF_ABYTES) {
+            throw new SodiumException('Message must be at least CRYPTO_AEAD_XCHACHA20POLY1305_IETF_ABYTES long');
+        }
+        if (self::useNewSodiumAPI() && !$dontFallback) {
+            if (is_callable('sodium_crypto_aead_xchacha20poly1305_ietf_decrypt')) {
+                return sodium_crypto_aead_xchacha20poly1305_ietf_decrypt(
+                    $ciphertext,
+                    $assocData,
+                    $nonce,
+                    $key
+                );
+            }
+        }
+
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::aead_xchacha20poly1305_ietf_decrypt(
+                $ciphertext,
+                $assocData,
+                $nonce,
+                $key
+            );
+        }
+        return ParagonIE_Sodium_Crypto::aead_xchacha20poly1305_ietf_decrypt(
+            $ciphertext,
+            $assocData,
+            $nonce,
+            $key
+        );
+    }
+
+    /**
+     * Authenticated Encryption with Associated Data
+     *
+     * Algorithm:
+     *     XChaCha20-Poly1305
+     *
+     * This mode uses a 64-bit random nonce with a 64-bit counter.
+     * IETF mode uses a 96-bit random nonce with a 32-bit counter.
+     *
+     * @param string $plaintext    Message to be encrypted
+     * @param string $assocData    Authenticated Associated Data (unencrypted)
+     * @param string $nonce        Number to be used only Once; must be 8 bytes
+     * @param string $key          Encryption key
+     * @param bool   $dontFallback Don't fallback to ext/sodium
+     *
+     * @return string           Ciphertext with a 16-byte Poly1305 message
+     *                          authentication code appended
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_aead_xchacha20poly1305_ietf_encrypt(
+        $plaintext = '',
+        $assocData = '',
+        $nonce = '',
+        $key = '',
+        $dontFallback = false
+    ) {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($plaintext, 'string', 1);
+        if (!is_null($assocData)) {
+            ParagonIE_Sodium_Core_Util::declareScalarType($assocData, 'string', 2);
+        } else {
+            $assocData = '';
+        }
+        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 3);
+        ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 4);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_AEAD_XCHACHA20POLY1305_IETF_NPUBBYTES) {
+            throw new SodiumException('Nonce must be CRYPTO_AEAD_XCHACHA20POLY1305_NPUBBYTES long');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AEAD_XCHACHA20POLY1305_IETF_KEYBYTES) {
+            throw new SodiumException('Key must be CRYPTO_AEAD_XCHACHA20POLY1305_KEYBYTES long');
+        }
+        if (self::useNewSodiumAPI() && !$dontFallback) {
+            if (is_callable('sodium_crypto_aead_xchacha20poly1305_ietf_encrypt')) {
+                return sodium_crypto_aead_xchacha20poly1305_ietf_encrypt(
+                    $plaintext,
+                    $assocData,
+                    $nonce,
+                    $key
+                );
+            }
+        }
+
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::aead_xchacha20poly1305_ietf_encrypt(
+                $plaintext,
+                $assocData,
+                $nonce,
+                $key
+            );
+        }
+        return ParagonIE_Sodium_Crypto::aead_xchacha20poly1305_ietf_encrypt(
+            $plaintext,
+            $assocData,
+            $nonce,
+            $key
+        );
+    }
+
+    /**
+     * Return a secure random key for use with the XChaCha20-Poly1305
+     * symmetric AEAD interface.
+     *
+     * @return string
+     * @throws Exception
+     * @throws Error
+     */
+    public static function crypto_aead_xchacha20poly1305_ietf_keygen()
+    {
+        return random_bytes(self::CRYPTO_AEAD_XCHACHA20POLY1305_IETF_KEYBYTES);
+    }
+
+    /**
+     * Authenticate a message. Uses symmetric-key cryptography.
+     *
+     * Algorithm:
+     *     HMAC-SHA512-256. Which is HMAC-SHA-512 truncated to 256 bits.
+     *     Not to be confused with HMAC-SHA-512/256 which would use the
+     *     SHA-512/256 hash function (uses different initial parameters
+     *     but still truncates to 256 bits to sidestep length-extension
+     *     attacks).
+     *
+     * @param string $message Message to be authenticated
+     * @param string $key Symmetric authentication key
+     * @return string         Message authentication code
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_auth($message, $key)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($message, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 2);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AUTH_KEYBYTES) {
+            throw new SodiumException('Argument 2 must be CRYPTO_AUTH_KEYBYTES long.');
+        }
+
+        if (self::useNewSodiumAPI()) {
+            return (string) sodium_crypto_auth($message, $key);
+        }
+        if (self::use_fallback('crypto_auth')) {
+            return (string) call_user_func('\\Sodium\\crypto_auth', $message, $key);
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::auth($message, $key);
+        }
+        return ParagonIE_Sodium_Crypto::auth($message, $key);
+    }
+
+    /**
+     * @return string
+     * @throws Exception
+     * @throws Error
+     */
+    public static function crypto_auth_keygen()
+    {
+        return random_bytes(self::CRYPTO_AUTH_KEYBYTES);
+    }
+
+    /**
+     * Verify the MAC of a message previously authenticated with crypto_auth.
+     *
+     * @param string $mac Message authentication code
+     * @param string $message Message whose authenticity you are attempting to
+     *                        verify (with a given MAC and key)
+     * @param string $key Symmetric authentication key
+     * @return bool           TRUE if authenticated, FALSE otherwise
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_auth_verify($mac, $message, $key)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($mac, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($message, 'string', 2);
+        ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 3);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($mac) !== self::CRYPTO_AUTH_BYTES) {
+            throw new SodiumException('Argument 1 must be CRYPTO_AUTH_BYTES long.');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AUTH_KEYBYTES) {
+            throw new SodiumException('Argument 3 must be CRYPTO_AUTH_KEYBYTES long.');
+        }
+
+        if (self::useNewSodiumAPI()) {
+            return (bool) sodium_crypto_auth_verify($mac, $message, $key);
+        }
+        if (self::use_fallback('crypto_auth_verify')) {
+            return (bool) call_user_func('\\Sodium\\crypto_auth_verify', $mac, $message, $key);
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::auth_verify($mac, $message, $key);
+        }
+        return ParagonIE_Sodium_Crypto::auth_verify($mac, $message, $key);
+    }
+
+    /**
+     * Authenticated asymmetric-key encryption. Both the sender and recipient
+     * may decrypt messages.
+     *
+     * Algorithm: X25519-XSalsa20-Poly1305.
+     *     X25519: Elliptic-Curve Diffie Hellman over Curve25519.
+     *     XSalsa20: Extended-nonce variant of salsa20.
+     *     Poyl1305: Polynomial MAC for one-time message authentication.
+     *
+     * @param string $plaintext The message to be encrypted
+     * @param string $nonce A Number to only be used Once; must be 24 bytes
+     * @param string $keypair Your secret key and your recipient's public key
+     * @return string           Ciphertext with 16-byte Poly1305 MAC
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_box($plaintext, $nonce, $keypair)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($plaintext, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 2);
+        ParagonIE_Sodium_Core_Util::declareScalarType($keypair, 'string', 3);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_BOX_NONCEBYTES) {
+            throw new SodiumException('Argument 2 must be CRYPTO_BOX_NONCEBYTES long.');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_BOX_KEYPAIRBYTES) {
+            throw new SodiumException('Argument 3 must be CRYPTO_BOX_KEYPAIRBYTES long.');
+        }
+
+        if (self::useNewSodiumAPI()) {
+            return (string) sodium_crypto_box($plaintext, $nonce, $keypair);
+        }
+        if (self::use_fallback('crypto_box')) {
+            return (string) call_user_func('\\Sodium\\crypto_box', $plaintext, $nonce, $keypair);
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::box($plaintext, $nonce, $keypair);
+        }
+        return ParagonIE_Sodium_Crypto::box($plaintext, $nonce, $keypair);
+    }
+
+    /**
+     * Anonymous public-key encryption. Only the recipient may decrypt messages.
+     *
+     * Algorithm: X25519-XSalsa20-Poly1305, as with crypto_box.
+     *     The sender's X25519 keypair is ephemeral.
+     *     Nonce is generated from the BLAKE2b hash of both public keys.
+     *
+     * This provides ciphertext integrity.
+     *
+     * @param string $plaintext Message to be sealed
+     * @param string $publicKey Your recipient's public key
+     * @return string           Sealed message that only your recipient can
+     *                          decrypt
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_box_seal($plaintext, $publicKey)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($plaintext, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($publicKey, 'string', 2);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($publicKey) !== self::CRYPTO_BOX_PUBLICKEYBYTES) {
+            throw new SodiumException('Argument 2 must be CRYPTO_BOX_PUBLICKEYBYTES long.');
+        }
+
+        if (self::useNewSodiumAPI()) {
+            return (string) sodium_crypto_box_seal($plaintext, $publicKey);
+        }
+        if (self::use_fallback('crypto_box_seal')) {
+            return (string) call_user_func('\\Sodium\\crypto_box_seal', $plaintext, $publicKey);
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::box_seal($plaintext, $publicKey);
+        }
+        return ParagonIE_Sodium_Crypto::box_seal($plaintext, $publicKey);
+    }
+
+    /**
+     * Opens a message encrypted with crypto_box_seal(). Requires
+     * the recipient's keypair (sk || pk) to decrypt successfully.
+     *
+     * This validates ciphertext integrity.
+     *
+     * @param string $ciphertext Sealed message to be opened
+     * @param string $keypair    Your crypto_box keypair
+     * @return string            The original plaintext message
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     * @psalm-suppress MixedInferredReturnType
+     * @psalm-suppress MixedReturnStatement
+     */
+    public static function crypto_box_seal_open($ciphertext, $keypair)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($ciphertext, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($keypair, 'string', 2);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_BOX_KEYPAIRBYTES) {
+            throw new SodiumException('Argument 2 must be CRYPTO_BOX_KEYPAIRBYTES long.');
+        }
+
+        if (self::useNewSodiumAPI()) {
+            /**
+             * @psalm-suppress InvalidReturnStatement
+             * @psalm-suppress FalsableReturnStatement
+             */
+            return sodium_crypto_box_seal_open($ciphertext, $keypair);
+        }
+        if (self::use_fallback('crypto_box_seal_open')) {
+            return call_user_func('\\Sodium\\crypto_box_seal_open', $ciphertext, $keypair);
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::box_seal_open($ciphertext, $keypair);
+        }
+        return ParagonIE_Sodium_Crypto::box_seal_open($ciphertext, $keypair);
+    }
+
+    /**
+     * Generate a new random X25519 keypair.
+     *
+     * @return string A 64-byte string; the first 32 are your secret key, while
+     *                the last 32 are your public key. crypto_box_secretkey()
+     *                and crypto_box_publickey() exist to separate them so you
+     *                don't accidentally get them mixed up!
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_box_keypair()
+    {
+        if (self::useNewSodiumAPI()) {
+            return (string) sodium_crypto_box_keypair();
+        }
+        if (self::use_fallback('crypto_box_keypair')) {
+            return (string) call_user_func('\\Sodium\\crypto_box_keypair');
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::box_keypair();
+        }
+        return ParagonIE_Sodium_Crypto::box_keypair();
+    }
+
+    /**
+     * Combine two keys into a keypair for use in library methods that expect
+     * a keypair. This doesn't necessarily have to be the same person's keys.
+     *
+     * @param string $secretKey Secret key
+     * @param string $publicKey Public key
+     * @return string    Keypair
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_box_keypair_from_secretkey_and_publickey($secretKey, $publicKey)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($secretKey, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($publicKey, 'string', 2);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($secretKey) !== self::CRYPTO_BOX_SECRETKEYBYTES) {
+            throw new SodiumException('Argument 1 must be CRYPTO_BOX_SECRETKEYBYTES long.');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($publicKey) !== self::CRYPTO_BOX_PUBLICKEYBYTES) {
+            throw new SodiumException('Argument 2 must be CRYPTO_BOX_PUBLICKEYBYTES long.');
+        }
+
+        if (self::useNewSodiumAPI()) {
+            return (string) sodium_crypto_box_keypair_from_secretkey_and_publickey($secretKey, $publicKey);
+        }
+        if (self::use_fallback('crypto_box_keypair_from_secretkey_and_publickey')) {
+            return (string) call_user_func('\\Sodium\\crypto_box_keypair_from_secretkey_and_publickey', $secretKey, $publicKey);
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::box_keypair_from_secretkey_and_publickey($secretKey, $publicKey);
+        }
+        return ParagonIE_Sodium_Crypto::box_keypair_from_secretkey_and_publickey($secretKey, $publicKey);
+    }
+
+    /**
+     * Decrypt a message previously encrypted with crypto_box().
+     *
+     * @param string $ciphertext Encrypted message
+     * @param string $nonce      Number to only be used Once; must be 24 bytes
+     * @param string $keypair    Your secret key and the sender's public key
+     * @return string            The original plaintext message
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     * @psalm-suppress MixedInferredReturnType
+     * @psalm-suppress MixedReturnStatement
+     */
+    public static function crypto_box_open($ciphertext, $nonce, $keypair)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($ciphertext, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 2);
+        ParagonIE_Sodium_Core_Util::declareScalarType($keypair, 'string', 3);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($ciphertext) < self::CRYPTO_BOX_MACBYTES) {
+            throw new SodiumException('Argument 1 must be at least CRYPTO_BOX_MACBYTES long.');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_BOX_NONCEBYTES) {
+            throw new SodiumException('Argument 2 must be CRYPTO_BOX_NONCEBYTES long.');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_BOX_KEYPAIRBYTES) {
+            throw new SodiumException('Argument 3 must be CRYPTO_BOX_KEYPAIRBYTES long.');
+        }
+
+        if (self::useNewSodiumAPI()) {
+            /**
+             * @psalm-suppress InvalidReturnStatement
+             * @psalm-suppress FalsableReturnStatement
+             */
+            return sodium_crypto_box_open($ciphertext, $nonce, $keypair);
+        }
+        if (self::use_fallback('crypto_box_open')) {
+            return call_user_func('\\Sodium\\crypto_box_open', $ciphertext, $nonce, $keypair);
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::box_open($ciphertext, $nonce, $keypair);
+        }
+        return ParagonIE_Sodium_Crypto::box_open($ciphertext, $nonce, $keypair);
+    }
+
+    /**
+     * Extract the public key from a crypto_box keypair.
+     *
+     * @param string $keypair Keypair containing secret and public key
+     * @return string         Your crypto_box public key
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_box_publickey($keypair)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($keypair, 'string', 1);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_BOX_KEYPAIRBYTES) {
+            throw new SodiumException('Argument 1 must be CRYPTO_BOX_KEYPAIRBYTES long.');
+        }
+
+        if (self::useNewSodiumAPI()) {
+            return (string) sodium_crypto_box_publickey($keypair);
+        }
+        if (self::use_fallback('crypto_box_publickey')) {
+            return (string) call_user_func('\\Sodium\\crypto_box_publickey', $keypair);
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::box_publickey($keypair);
+        }
+        return ParagonIE_Sodium_Crypto::box_publickey($keypair);
+    }
+
+    /**
+     * Calculate the X25519 public key from a given X25519 secret key.
+     *
+     * @param string $secretKey Any X25519 secret key
+     * @return string           The corresponding X25519 public key
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_box_publickey_from_secretkey($secretKey)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($secretKey, 'string', 1);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($secretKey) !== self::CRYPTO_BOX_SECRETKEYBYTES) {
+            throw new SodiumException('Argument 1 must be CRYPTO_BOX_SECRETKEYBYTES long.');
+        }
+
+        if (self::useNewSodiumAPI()) {
+            return (string) sodium_crypto_box_publickey_from_secretkey($secretKey);
+        }
+        if (self::use_fallback('crypto_box_publickey_from_secretkey')) {
+            return (string) call_user_func('\\Sodium\\crypto_box_publickey_from_secretkey', $secretKey);
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::box_publickey_from_secretkey($secretKey);
+        }
+        return ParagonIE_Sodium_Crypto::box_publickey_from_secretkey($secretKey);
+    }
+
+    /**
+     * Extract the secret key from a crypto_box keypair.
+     *
+     * @param string $keypair
+     * @return string         Your crypto_box secret key
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_box_secretkey($keypair)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($keypair, 'string', 1);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_BOX_KEYPAIRBYTES) {
+            throw new SodiumException('Argument 1 must be CRYPTO_BOX_KEYPAIRBYTES long.');
+        }
+
+        if (self::useNewSodiumAPI()) {
+            return (string) sodium_crypto_box_secretkey($keypair);
+        }
+        if (self::use_fallback('crypto_box_secretkey')) {
+            return (string) call_user_func('\\Sodium\\crypto_box_secretkey', $keypair);
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::box_secretkey($keypair);
+        }
+        return ParagonIE_Sodium_Crypto::box_secretkey($keypair);
+    }
+
+    /**
+     * Generate an X25519 keypair from a seed.
+     *
+     * @param string $seed
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     * @psalm-suppress UndefinedFunction
+     */
+    public static function crypto_box_seed_keypair($seed)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($seed, 'string', 1);
+
+        if (self::useNewSodiumAPI()) {
+            return (string) sodium_crypto_box_seed_keypair($seed);
+        }
+        if (self::use_fallback('crypto_box_seed_keypair')) {
+            return (string) call_user_func('\\Sodium\\crypto_box_seed_keypair', $seed);
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::box_seed_keypair($seed);
+        }
+        return ParagonIE_Sodium_Crypto::box_seed_keypair($seed);
+    }
+
+    /**
+     * Calculates a BLAKE2b hash, with an optional key.
+     *
+     * @param string      $message The message to be hashed
+     * @param string|null $key     If specified, must be a string between 16
+     *                             and 64 bytes long
+     * @param int         $length  Output length in bytes; must be between 16
+     *                             and 64 (default = 32)
+     * @return string              Raw binary
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_generichash($message, $key = '', $length = self::CRYPTO_GENERICHASH_BYTES)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($message, 'string', 1);
+        if (is_null($key)) {
+            $key = '';
+        }
+        ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 2);
+        ParagonIE_Sodium_Core_Util::declareScalarType($length, 'int', 3);
+
+        /* Input validation: */
+        if (!empty($key)) {
+            if (ParagonIE_Sodium_Core_Util::strlen($key) < self::CRYPTO_GENERICHASH_KEYBYTES_MIN) {
+                throw new SodiumException('Unsupported key size. Must be at least CRYPTO_GENERICHASH_KEYBYTES_MIN bytes long.');
+            }
+            if (ParagonIE_Sodium_Core_Util::strlen($key) > self::CRYPTO_GENERICHASH_KEYBYTES_MAX) {
+                throw new SodiumException('Unsupported key size. Must be at most CRYPTO_GENERICHASH_KEYBYTES_MAX bytes long.');
+            }
+        }
+
+        if (self::useNewSodiumAPI()) {
+            return (string) sodium_crypto_generichash($message, $key, $length);
+        }
+        if (self::use_fallback('crypto_generichash')) {
+            return (string) call_user_func('\\Sodium\\crypto_generichash', $message, $key, $length);
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::generichash($message, $key, $length);
+        }
+        return ParagonIE_Sodium_Crypto::generichash($message, $key, $length);
+    }
+
+    /**
+     * Get the final BLAKE2b hash output for a given context.
+     *
+     * @param string $ctx BLAKE2 hashing context. Generated by crypto_generichash_init().
+     * @param int $length Hash output size.
+     * @return string     Final BLAKE2b hash.
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     * @psalm-suppress ReferenceConstraintViolation
+     * @psalm-suppress ConflictingReferenceConstraint
+     */
+    public static function crypto_generichash_final(&$ctx, $length = self::CRYPTO_GENERICHASH_BYTES)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($ctx, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($length, 'int', 2);
+
+        if (self::useNewSodiumAPI()) {
+            return sodium_crypto_generichash_final($ctx, $length);
+        }
+        if (self::use_fallback('crypto_generichash_final')) {
+            $func = '\\Sodium\\crypto_generichash_final';
+            return (string) $func($ctx, $length);
+        }
+        if ($length < 1) {
+            try {
+                self::memzero($ctx);
+            } catch (SodiumException $ex) {
+                unset($ctx);
+            }
+            return '';
+        }
+        if (PHP_INT_SIZE === 4) {
+            $result = ParagonIE_Sodium_Crypto32::generichash_final($ctx, $length);
+        } else {
+            $result = ParagonIE_Sodium_Crypto::generichash_final($ctx, $length);
+        }
+        try {
+            self::memzero($ctx);
+        } catch (SodiumException $ex) {
+            unset($ctx);
+        }
+        return $result;
+    }
+
+    /**
+     * Initialize a BLAKE2b hashing context, for use in a streaming interface.
+     *
+     * @param string|null $key If specified must be a string between 16 and 64 bytes
+     * @param int $length      The size of the desired hash output
+     * @return string          A BLAKE2 hashing context, encoded as a string
+     *                         (To be 100% compatible with ext/libsodium)
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_generichash_init($key = '', $length = self::CRYPTO_GENERICHASH_BYTES)
+    {
+        /* Type checks: */
+        if (is_null($key)) {
+            $key = '';
+        }
+        ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($length, 'int', 2);
+
+        /* Input validation: */
+        if (!empty($key)) {
+            if (ParagonIE_Sodium_Core_Util::strlen($key) < self::CRYPTO_GENERICHASH_KEYBYTES_MIN) {
+                throw new SodiumException('Unsupported key size. Must be at least CRYPTO_GENERICHASH_KEYBYTES_MIN bytes long.');
+            }
+            if (ParagonIE_Sodium_Core_Util::strlen($key) > self::CRYPTO_GENERICHASH_KEYBYTES_MAX) {
+                throw new SodiumException('Unsupported key size. Must be at most CRYPTO_GENERICHASH_KEYBYTES_MAX bytes long.');
+            }
+        }
+
+        if (self::useNewSodiumAPI()) {
+            return sodium_crypto_generichash_init($key, $length);
+        }
+        if (self::use_fallback('crypto_generichash_init')) {
+            return (string) call_user_func('\\Sodium\\crypto_generichash_init', $key, $length);
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::generichash_init($key, $length);
+        }
+        return ParagonIE_Sodium_Crypto::generichash_init($key, $length);
+    }
+
+    /**
+     * Initialize a BLAKE2b hashing context, for use in a streaming interface.
+     *
+     * @param string|null $key If specified must be a string between 16 and 64 bytes
+     * @param int $length      The size of the desired hash output
+     * @param string $salt     Salt (up to 16 bytes)
+     * @param string $personal Personalization string (up to 16 bytes)
+     * @return string          A BLAKE2 hashing context, encoded as a string
+     *                         (To be 100% compatible with ext/libsodium)
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_generichash_init_salt_personal(
+        $key = '',
+        $length = self::CRYPTO_GENERICHASH_BYTES,
+        $salt = '',
+        $personal = ''
+    ) {
+        /* Type checks: */
+        if (is_null($key)) {
+            $key = '';
+        }
+        ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($length, 'int', 2);
+        ParagonIE_Sodium_Core_Util::declareScalarType($salt, 'string', 3);
+        ParagonIE_Sodium_Core_Util::declareScalarType($personal, 'string', 4);
+        $salt = str_pad($salt, 16, "\0", STR_PAD_RIGHT);
+        $personal = str_pad($personal, 16, "\0", STR_PAD_RIGHT);
+
+        /* Input validation: */
+        if (!empty($key)) {
+            /*
+            if (ParagonIE_Sodium_Core_Util::strlen($key) < self::CRYPTO_GENERICHASH_KEYBYTES_MIN) {
+                throw new SodiumException('Unsupported key size. Must be at least CRYPTO_GENERICHASH_KEYBYTES_MIN bytes long.');
+            }
+            */
+            if (ParagonIE_Sodium_Core_Util::strlen($key) > self::CRYPTO_GENERICHASH_KEYBYTES_MAX) {
+                throw new SodiumException('Unsupported key size. Must be at most CRYPTO_GENERICHASH_KEYBYTES_MAX bytes long.');
+            }
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::generichash_init_salt_personal($key, $length, $salt, $personal);
+        }
+        return ParagonIE_Sodium_Crypto::generichash_init_salt_personal($key, $length, $salt, $personal);
+    }
+
+    /**
+     * Update a BLAKE2b hashing context with additional data.
+     *
+     * @param string $ctx    BLAKE2 hashing context. Generated by crypto_generichash_init().
+     *                       $ctx is passed by reference and gets updated in-place.
+     * @param-out string $ctx
+     * @param string $message The message to append to the existing hash state.
+     * @return void
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     * @psalm-suppress ReferenceConstraintViolation
+     */
+    public static function crypto_generichash_update(&$ctx, $message)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($ctx, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($message, 'string', 2);
+
+        if (self::useNewSodiumAPI()) {
+            sodium_crypto_generichash_update($ctx, $message);
+            return;
+        }
+        if (self::use_fallback('crypto_generichash_update')) {
+            $func = '\\Sodium\\crypto_generichash_update';
+            $func($ctx, $message);
+            return;
+        }
+        if (PHP_INT_SIZE === 4) {
+            $ctx = ParagonIE_Sodium_Crypto32::generichash_update($ctx, $message);
+        } else {
+            $ctx = ParagonIE_Sodium_Crypto::generichash_update($ctx, $message);
+        }
+    }
+
+    /**
+     * @return string
+     * @throws Exception
+     * @throws Error
+     */
+    public static function crypto_generichash_keygen()
+    {
+        return random_bytes(self::CRYPTO_GENERICHASH_KEYBYTES);
+    }
+
+    /**
+     * @param int $subkey_len
+     * @param int $subkey_id
+     * @param string $context
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     */
+    public static function crypto_kdf_derive_from_key(
+        $subkey_len,
+        $subkey_id,
+        $context,
+        $key
+    ) {
+        ParagonIE_Sodium_Core_Util::declareScalarType($subkey_len, 'int', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($subkey_id, 'int', 2);
+        ParagonIE_Sodium_Core_Util::declareScalarType($context, 'string', 3);
+        ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 4);
+        $subkey_id = (int) $subkey_id;
+        $subkey_len = (int) $subkey_len;
+        $context = (string) $context;
+        $key = (string) $key;
+
+        if ($subkey_len < self::CRYPTO_KDF_BYTES_MIN) {
+            throw new SodiumException('subkey cannot be smaller than SODIUM_CRYPTO_KDF_BYTES_MIN');
+        }
+        if ($subkey_len > self::CRYPTO_KDF_BYTES_MAX) {
+            throw new SodiumException('subkey cannot be larger than SODIUM_CRYPTO_KDF_BYTES_MAX');
+        }
+        if ($subkey_id < 0) {
+            throw new SodiumException('subkey_id cannot be negative');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($context) !== self::CRYPTO_KDF_CONTEXTBYTES) {
+            throw new SodiumException('context should be SODIUM_CRYPTO_KDF_CONTEXTBYTES bytes');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_KDF_KEYBYTES) {
+            throw new SodiumException('key should be SODIUM_CRYPTO_KDF_KEYBYTES bytes');
+        }
+
+        $salt = ParagonIE_Sodium_Core_Util::store64_le($subkey_id);
+        $state = self::crypto_generichash_init_salt_personal(
+            $key,
+            $subkey_len,
+            $salt,
+            $context
+        );
+        return self::crypto_generichash_final($state, $subkey_len);
+    }
+
+    /**
+     * @return string
+     * @throws Exception
+     * @throws Error
+     */
+    public static function crypto_kdf_keygen()
+    {
+        return random_bytes(self::CRYPTO_KDF_KEYBYTES);
+    }
+
+    /**
+     * Perform a key exchange, between a designated client and a server.
+     *
+     * Typically, you would designate one machine to be the client and the
+     * other to be the server. The first two keys are what you'd expect for
+     * scalarmult() below, but the latter two public keys don't swap places.
+     *
+     * | ALICE                          | BOB                                 |
+     * | Client                         | Server                              |
+     * |--------------------------------|-------------------------------------|
+     * | shared = crypto_kx(            | shared = crypto_kx(                 |
+     * |     alice_sk,                  |     bob_sk,                         | <- contextual
+     * |     bob_pk,                    |     alice_pk,                       | <- contextual
+     * |     alice_pk,                  |     alice_pk,                       | <----- static
+     * |     bob_pk                     |     bob_pk                          | <----- static
+     * | )                              | )                                   |
+     *
+     * They are used along with the scalarmult product to generate a 256-bit
+     * BLAKE2b hash unique to the client and server keys.
+     *
+     * @param string $my_secret
+     * @param string $their_public
+     * @param string $client_public
+     * @param string $server_public
+     * @param bool $dontFallback
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_kx($my_secret, $their_public, $client_public, $server_public, $dontFallback = false)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($my_secret, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($their_public, 'string', 2);
+        ParagonIE_Sodium_Core_Util::declareScalarType($client_public, 'string', 3);
+        ParagonIE_Sodium_Core_Util::declareScalarType($server_public, 'string', 4);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($my_secret) !== self::CRYPTO_BOX_SECRETKEYBYTES) {
+            throw new SodiumException('Argument 1 must be CRYPTO_BOX_SECRETKEYBYTES long.');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($their_public) !== self::CRYPTO_BOX_PUBLICKEYBYTES) {
+            throw new SodiumException('Argument 2 must be CRYPTO_BOX_PUBLICKEYBYTES long.');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($client_public) !== self::CRYPTO_BOX_PUBLICKEYBYTES) {
+            throw new SodiumException('Argument 3 must be CRYPTO_BOX_PUBLICKEYBYTES long.');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($server_public) !== self::CRYPTO_BOX_PUBLICKEYBYTES) {
+            throw new SodiumException('Argument 4 must be CRYPTO_BOX_PUBLICKEYBYTES long.');
+        }
+
+        if (self::useNewSodiumAPI() && !$dontFallback) {
+            if (is_callable('sodium_crypto_kx')) {
+                return (string) sodium_crypto_kx(
+                    $my_secret,
+                    $their_public,
+                    $client_public,
+                    $server_public
+                );
+            }
+        }
+        if (self::use_fallback('crypto_kx')) {
+            return (string) call_user_func(
+                '\\Sodium\\crypto_kx',
+                $my_secret,
+                $their_public,
+                $client_public,
+                $server_public
+            );
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::keyExchange(
+                $my_secret,
+                $their_public,
+                $client_public,
+                $server_public
+            );
+        }
+        return ParagonIE_Sodium_Crypto::keyExchange(
+            $my_secret,
+            $their_public,
+            $client_public,
+            $server_public
+        );
+    }
+
+    /**
+     * @param string $seed
+     * @return string
+     * @throws SodiumException
+     */
+    public static function crypto_kx_seed_keypair($seed)
+    {
+        ParagonIE_Sodium_Core_Util::declareScalarType($seed, 'string', 1);
+
+        $seed = (string) $seed;
+
+        if (ParagonIE_Sodium_Core_Util::strlen($seed) !== self::CRYPTO_KX_SEEDBYTES) {
+            throw new SodiumException('seed must be SODIUM_CRYPTO_KX_SEEDBYTES bytes');
+        }
+
+        $sk = self::crypto_generichash($seed, '', self::CRYPTO_KX_SECRETKEYBYTES);
+        $pk = self::crypto_scalarmult_base($sk);
+        return $sk . $pk;
+    }
+
+    /**
+     * @return string
+     * @throws Exception
+     */
+    public static function crypto_kx_keypair()
+    {
+        $sk = self::randombytes_buf(self::CRYPTO_KX_SECRETKEYBYTES);
+        $pk = self::crypto_scalarmult_base($sk);
+        return $sk . $pk;
+    }
+
+    /**
+     * @param string $keypair
+     * @param string $serverPublicKey
+     * @return array{0: string, 1: string}
+     * @throws SodiumException
+     */
+    public static function crypto_kx_client_session_keys($keypair, $serverPublicKey)
+    {
+        ParagonIE_Sodium_Core_Util::declareScalarType($keypair, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($serverPublicKey, 'string', 2);
+
+        $keypair = (string) $keypair;
+        $serverPublicKey = (string) $serverPublicKey;
+
+        if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_KX_KEYPAIRBYTES) {
+            throw new SodiumException('keypair should be SODIUM_CRYPTO_KX_KEYPAIRBYTES bytes');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($serverPublicKey) !== self::CRYPTO_KX_PUBLICKEYBYTES) {
+            throw new SodiumException('public keys must be SODIUM_CRYPTO_KX_PUBLICKEYBYTES bytes');
+        }
+
+        $sk = self::crypto_kx_secretkey($keypair);
+        $pk = self::crypto_kx_publickey($keypair);
+        $h = self::crypto_generichash_init(null, self::CRYPTO_KX_SESSIONKEYBYTES * 2);
+        self::crypto_generichash_update($h, self::crypto_scalarmult($sk, $serverPublicKey));
+        self::crypto_generichash_update($h, $pk);
+        self::crypto_generichash_update($h, $serverPublicKey);
+        $sessionKeys = self::crypto_generichash_final($h, self::CRYPTO_KX_SESSIONKEYBYTES * 2);
+        return array(
+            ParagonIE_Sodium_Core_Util::substr(
+                $sessionKeys,
+                0,
+                self::CRYPTO_KX_SESSIONKEYBYTES
+            ),
+            ParagonIE_Sodium_Core_Util::substr(
+                $sessionKeys,
+                self::CRYPTO_KX_SESSIONKEYBYTES,
+                self::CRYPTO_KX_SESSIONKEYBYTES
+            )
+        );
+    }
+
+    /**
+     * @param string $keypair
+     * @param string $clientPublicKey
+     * @return array{0: string, 1: string}
+     * @throws SodiumException
+     */
+    public static function crypto_kx_server_session_keys($keypair, $clientPublicKey)
+    {
+        ParagonIE_Sodium_Core_Util::declareScalarType($keypair, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($clientPublicKey, 'string', 2);
+
+        $keypair = (string) $keypair;
+        $clientPublicKey = (string) $clientPublicKey;
+
+        if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_KX_KEYPAIRBYTES) {
+            throw new SodiumException('keypair should be SODIUM_CRYPTO_KX_KEYPAIRBYTES bytes');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($clientPublicKey) !== self::CRYPTO_KX_PUBLICKEYBYTES) {
+            throw new SodiumException('public keys must be SODIUM_CRYPTO_KX_PUBLICKEYBYTES bytes');
+        }
+
+        $sk = self::crypto_kx_secretkey($keypair);
+        $pk = self::crypto_kx_publickey($keypair);
+        $h = self::crypto_generichash_init(null, self::CRYPTO_KX_SESSIONKEYBYTES * 2);
+        self::crypto_generichash_update($h, self::crypto_scalarmult($sk, $clientPublicKey));
+        self::crypto_generichash_update($h, $clientPublicKey);
+        self::crypto_generichash_update($h, $pk);
+        $sessionKeys = self::crypto_generichash_final($h, self::CRYPTO_KX_SESSIONKEYBYTES * 2);
+        return array(
+            ParagonIE_Sodium_Core_Util::substr(
+                $sessionKeys,
+                self::CRYPTO_KX_SESSIONKEYBYTES,
+                self::CRYPTO_KX_SESSIONKEYBYTES
+            ),
+            ParagonIE_Sodium_Core_Util::substr(
+                $sessionKeys,
+                0,
+                self::CRYPTO_KX_SESSIONKEYBYTES
+            )
+        );
+    }
+
+    /**
+     * @param string $kp
+     * @return string
+     * @throws SodiumException
+     */
+    public static function crypto_kx_secretkey($kp)
+    {
+        return ParagonIE_Sodium_Core_Util::substr(
+            $kp,
+            0,
+            self::CRYPTO_KX_SECRETKEYBYTES
+        );
+    }
+
+    /**
+     * @param string $kp
+     * @return string
+     * @throws SodiumException
+     */
+    public static function crypto_kx_publickey($kp)
+    {
+        return ParagonIE_Sodium_Core_Util::substr(
+            $kp,
+            self::CRYPTO_KX_SECRETKEYBYTES,
+            self::CRYPTO_KX_PUBLICKEYBYTES
+        );
+    }
+
+    /**
+     * @param int $outlen
+     * @param string $passwd
+     * @param string $salt
+     * @param int $opslimit
+     * @param int $memlimit
+     * @param int|null $alg
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_pwhash($outlen, $passwd, $salt, $opslimit, $memlimit, $alg = null)
+    {
+        ParagonIE_Sodium_Core_Util::declareScalarType($outlen, 'int', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($passwd, 'string', 2);
+        ParagonIE_Sodium_Core_Util::declareScalarType($salt,  'string', 3);
+        ParagonIE_Sodium_Core_Util::declareScalarType($opslimit, 'int', 4);
+        ParagonIE_Sodium_Core_Util::declareScalarType($memlimit, 'int', 5);
+
+        if (self::useNewSodiumAPI()) {
+            if (!is_null($alg)) {
+                ParagonIE_Sodium_Core_Util::declareScalarType($alg, 'int', 6);
+                return sodium_crypto_pwhash($outlen, $passwd, $salt, $opslimit, $memlimit, $alg);
+            }
+            return sodium_crypto_pwhash($outlen, $passwd, $salt, $opslimit, $memlimit);
+        }
+        if (self::use_fallback('crypto_pwhash')) {
+            return (string) call_user_func('\\Sodium\\crypto_pwhash', $outlen, $passwd, $salt, $opslimit, $memlimit);
+        }
+        // This is the best we can do.
+        throw new SodiumException(
+            'This is not implemented, as it is not possible to implement Argon2i with acceptable performance in pure-PHP'
+        );
+    }
+
+    /**
+     * !Exclusive to sodium_compat!
+     *
+     * This returns TRUE if the native crypto_pwhash API is available by libsodium.
+     * This returns FALSE if only sodium_compat is available.
+     *
+     * @return bool
+     */
+    public static function crypto_pwhash_is_available()
+    {
+        if (self::useNewSodiumAPI()) {
+            return true;
+        }
+        if (self::use_fallback('crypto_pwhash')) {
+            return true;
+        }
+        return false;
+    }
+
+    /**
+     * @param string $passwd
+     * @param int $opslimit
+     * @param int $memlimit
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_pwhash_str($passwd, $opslimit, $memlimit)
+    {
+        ParagonIE_Sodium_Core_Util::declareScalarType($passwd, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($opslimit, 'int', 2);
+        ParagonIE_Sodium_Core_Util::declareScalarType($memlimit, 'int', 3);
+
+        if (self::useNewSodiumAPI()) {
+            return sodium_crypto_pwhash_str($passwd, $opslimit, $memlimit);
+        }
+        if (self::use_fallback('crypto_pwhash_str')) {
+            return (string) call_user_func('\\Sodium\\crypto_pwhash_str', $passwd, $opslimit, $memlimit);
+        }
+        // This is the best we can do.
+        throw new SodiumException(
+            'This is not implemented, as it is not possible to implement Argon2i with acceptable performance in pure-PHP'
+        );
+    }
+
+    /**
+     * Do we need to rehash this password?
+     *
+     * @param string $hash
+     * @param int $opslimit
+     * @param int $memlimit
+     * @return bool
+     * @throws SodiumException
+     */
+    public static function crypto_pwhash_str_needs_rehash($hash, $opslimit, $memlimit)
+    {
+        ParagonIE_Sodium_Core_Util::declareScalarType($hash, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($opslimit, 'int', 2);
+        ParagonIE_Sodium_Core_Util::declareScalarType($memlimit, 'int', 3);
+
+        // Just grab the first 4 pieces.
+        $pieces = explode('$', (string) $hash);
+        $prefix = implode('$', array_slice($pieces, 0, 4));
+
+        // Rebuild the expected header.
+        /** @var int $ops */
+        $ops = (int) $opslimit;
+        /** @var int $mem */
+        $mem = (int) $memlimit >> 10;
+        $encoded = self::CRYPTO_PWHASH_STRPREFIX . 'v=19$m=' . $mem . ',t=' . $ops . ',p=1';
+
+        // Do they match? If so, we don't need to rehash, so return false.
+        return !ParagonIE_Sodium_Core_Util::hashEquals($encoded, $prefix);
+    }
+
+    /**
+     * @param string $passwd
+     * @param string $hash
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_pwhash_str_verify($passwd, $hash)
+    {
+        ParagonIE_Sodium_Core_Util::declareScalarType($passwd, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($hash, 'string', 2);
+
+        if (self::useNewSodiumAPI()) {
+            return (bool) sodium_crypto_pwhash_str_verify($passwd, $hash);
+        }
+        if (self::use_fallback('crypto_pwhash_str_verify')) {
+            return (bool) call_user_func('\\Sodium\\crypto_pwhash_str_verify', $passwd, $hash);
+        }
+        // This is the best we can do.
+        throw new SodiumException(
+            'This is not implemented, as it is not possible to implement Argon2i with acceptable performance in pure-PHP'
+        );
+    }
+
+    /**
+     * @param int $outlen
+     * @param string $passwd
+     * @param string $salt
+     * @param int $opslimit
+     * @param int $memlimit
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function crypto_pwhash_scryptsalsa208sha256($outlen, $passwd, $salt, $opslimit, $memlimit)
+    {
+        ParagonIE_Sodium_Core_Util::declareScalarType($outlen, 'int', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($passwd, 'string', 2);
+        ParagonIE_Sodium_Core_Util::declareScalarType($salt,  'string', 3);
+        ParagonIE_Sodium_Core_Util::declareScalarType($opslimit, 'int', 4);
+        ParagonIE_Sodium_Core_Util::declareScalarType($memlimit, 'int', 5);
+
+        if (self::useNewSodiumAPI()) {
+            return (string) sodium_crypto_pwhash_scryptsalsa208sha256(
+                (int) $outlen,
+                (string) $passwd,
+                (string) $salt,
+                (int) $opslimit,
+                (int) $memlimit
+            );
+        }
+        if (self::use_fallback('crypto_pwhash_scryptsalsa208sha256')) {
+            return (string) call_user_func(
+                '\\Sodium\\crypto_pwhash_scryptsalsa208sha256',
+                (int) $outlen,
+                (string) $passwd,
+                (string) $salt,
+                (int) $opslimit,
+                (int) $memlimit
+            );
+        }
+        // This is the best we can do.
+        throw new SodiumException(
+            'This is not implemented, as it is not possible to implement Scrypt with acceptable performance in pure-PHP'
+        );
+    }
+
+    /**
+     * !Exclusive to sodium_compat!
+     *
+     * This returns TRUE if the native crypto_pwhash API is available by libsodium.
+     * This returns FALSE if only sodium_compat is available.
+     *
+     * @return bool
+     */
+    public static function crypto_pwhash_scryptsalsa208sha256_is_available()
+    {
+        if (self::useNewSodiumAPI()) {
+            return true;
+        }
+        if (self::use_fallback('crypto_pwhash_scryptsalsa208sha256')) {
+            return true;
+        }
+        return false;
+    }
+
+    /**
+     * @param string $passwd
+     * @param int $opslimit
+     * @param int $memlimit
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function crypto_pwhash_scryptsalsa208sha256_str($passwd, $opslimit, $memlimit)
+    {
+        ParagonIE_Sodium_Core_Util::declareScalarType($passwd, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($opslimit, 'int', 2);
+        ParagonIE_Sodium_Core_Util::declareScalarType($memlimit, 'int', 3);
+
+        if (self::useNewSodiumAPI()) {
+            return (string) sodium_crypto_pwhash_scryptsalsa208sha256_str(
+                (string) $passwd,
+                (int) $opslimit,
+                (int) $memlimit
+            );
+        }
+        if (self::use_fallback('crypto_pwhash_scryptsalsa208sha256_str')) {
+            return (string) call_user_func(
+                '\\Sodium\\crypto_pwhash_scryptsalsa208sha256_str',
+                (string) $passwd,
+                (int) $opslimit,
+                (int) $memlimit
+            );
+        }
+        // This is the best we can do.
+        throw new SodiumException(
+            'This is not implemented, as it is not possible to implement Scrypt with acceptable performance in pure-PHP'
+        );
+    }
+
+    /**
+     * @param string $passwd
+     * @param string $hash
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function crypto_pwhash_scryptsalsa208sha256_str_verify($passwd, $hash)
+    {
+        ParagonIE_Sodium_Core_Util::declareScalarType($passwd, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($hash, 'string', 2);
+
+        if (self::useNewSodiumAPI()) {
+            return (bool) sodium_crypto_pwhash_scryptsalsa208sha256_str_verify(
+                (string) $passwd,
+                (string) $hash
+            );
+        }
+        if (self::use_fallback('crypto_pwhash_scryptsalsa208sha256_str_verify')) {
+            return (bool) call_user_func(
+                '\\Sodium\\crypto_pwhash_scryptsalsa208sha256_str_verify',
+                (string) $passwd,
+                (string) $hash
+            );
+        }
+        // This is the best we can do.
+        throw new SodiumException(
+            'This is not implemented, as it is not possible to implement Scrypt with acceptable performance in pure-PHP'
+        );
+    }
+
+    /**
+     * Calculate the shared secret between your secret key and your
+     * recipient's public key.
+     *
+     * Algorithm: X25519 (ECDH over Curve25519)
+     *
+     * @param string $secretKey
+     * @param string $publicKey
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_scalarmult($secretKey, $publicKey)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($secretKey, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($publicKey, 'string', 2);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($secretKey) !== self::CRYPTO_BOX_SECRETKEYBYTES) {
+            throw new SodiumException('Argument 1 must be CRYPTO_BOX_SECRETKEYBYTES long.');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($publicKey) !== self::CRYPTO_BOX_PUBLICKEYBYTES) {
+            throw new SodiumException('Argument 2 must be CRYPTO_BOX_PUBLICKEYBYTES long.');
+        }
+
+        if (self::useNewSodiumAPI()) {
+            return sodium_crypto_scalarmult($secretKey, $publicKey);
+        }
+        if (self::use_fallback('crypto_scalarmult')) {
+            return (string) call_user_func('\\Sodium\\crypto_scalarmult', $secretKey, $publicKey);
+        }
+
+        /* Output validation: Forbid all-zero keys */
+        if (ParagonIE_Sodium_Core_Util::hashEquals($secretKey, str_repeat("\0", self::CRYPTO_BOX_SECRETKEYBYTES))) {
+            throw new SodiumException('Zero secret key is not allowed');
+        }
+        if (ParagonIE_Sodium_Core_Util::hashEquals($publicKey, str_repeat("\0", self::CRYPTO_BOX_PUBLICKEYBYTES))) {
+            throw new SodiumException('Zero public key is not allowed');
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::scalarmult($secretKey, $publicKey);
+        }
+        return ParagonIE_Sodium_Crypto::scalarmult($secretKey, $publicKey);
+    }
+
+    /**
+     * Calculate an X25519 public key from an X25519 secret key.
+     *
+     * @param string $secretKey
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress TooFewArguments
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_scalarmult_base($secretKey)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($secretKey, 'string', 1);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($secretKey) !== self::CRYPTO_BOX_SECRETKEYBYTES) {
+            throw new SodiumException('Argument 1 must be CRYPTO_BOX_SECRETKEYBYTES long.');
+        }
+
+        if (self::useNewSodiumAPI()) {
+            return sodium_crypto_scalarmult_base($secretKey);
+        }
+        if (self::use_fallback('crypto_scalarmult_base')) {
+            return (string) call_user_func('\\Sodium\\crypto_scalarmult_base', $secretKey);
+        }
+        if (ParagonIE_Sodium_Core_Util::hashEquals($secretKey, str_repeat("\0", self::CRYPTO_BOX_SECRETKEYBYTES))) {
+            throw new SodiumException('Zero secret key is not allowed');
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::scalarmult_base($secretKey);
+        }
+        return ParagonIE_Sodium_Crypto::scalarmult_base($secretKey);
+    }
+
+    /**
+     * Authenticated symmetric-key encryption.
+     *
+     * Algorithm: XSalsa20-Poly1305
+     *
+     * @param string $plaintext The message you're encrypting
+     * @param string $nonce A Number to be used Once; must be 24 bytes
+     * @param string $key Symmetric encryption key
+     * @return string           Ciphertext with Poly1305 MAC
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_secretbox($plaintext, $nonce, $key)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($plaintext, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 2);
+        ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 3);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_SECRETBOX_NONCEBYTES) {
+            throw new SodiumException('Argument 2 must be CRYPTO_SECRETBOX_NONCEBYTES long.');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_SECRETBOX_KEYBYTES) {
+            throw new SodiumException('Argument 3 must be CRYPTO_SECRETBOX_KEYBYTES long.');
+        }
+
+        if (self::useNewSodiumAPI()) {
+            return sodium_crypto_secretbox($plaintext, $nonce, $key);
+        }
+        if (self::use_fallback('crypto_secretbox')) {
+            return (string) call_user_func('\\Sodium\\crypto_secretbox', $plaintext, $nonce, $key);
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::secretbox($plaintext, $nonce, $key);
+        }
+        return ParagonIE_Sodium_Crypto::secretbox($plaintext, $nonce, $key);
+    }
+
+    /**
+     * Decrypts a message previously encrypted with crypto_secretbox().
+     *
+     * @param string $ciphertext Ciphertext with Poly1305 MAC
+     * @param string $nonce      A Number to be used Once; must be 24 bytes
+     * @param string $key        Symmetric encryption key
+     * @return string            Original plaintext message
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     * @psalm-suppress MixedInferredReturnType
+     * @psalm-suppress MixedReturnStatement
+     */
+    public static function crypto_secretbox_open($ciphertext, $nonce, $key)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($ciphertext, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 2);
+        ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 3);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_SECRETBOX_NONCEBYTES) {
+            throw new SodiumException('Argument 2 must be CRYPTO_SECRETBOX_NONCEBYTES long.');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_SECRETBOX_KEYBYTES) {
+            throw new SodiumException('Argument 3 must be CRYPTO_SECRETBOX_KEYBYTES long.');
+        }
+
+        if (self::useNewSodiumAPI()) {
+            /**
+             * @psalm-suppress InvalidReturnStatement
+             * @psalm-suppress FalsableReturnStatement
+             */
+            return sodium_crypto_secretbox_open($ciphertext, $nonce, $key);
+        }
+        if (self::use_fallback('crypto_secretbox_open')) {
+            return call_user_func('\\Sodium\\crypto_secretbox_open', $ciphertext, $nonce, $key);
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::secretbox_open($ciphertext, $nonce, $key);
+        }
+        return ParagonIE_Sodium_Crypto::secretbox_open($ciphertext, $nonce, $key);
+    }
+
+    /**
+     * Return a secure random key for use with crypto_secretbox
+     *
+     * @return string
+     * @throws Exception
+     * @throws Error
+     */
+    public static function crypto_secretbox_keygen()
+    {
+        return random_bytes(self::CRYPTO_SECRETBOX_KEYBYTES);
+    }
+
+    /**
+     * Authenticated symmetric-key encryption.
+     *
+     * Algorithm: XChaCha20-Poly1305
+     *
+     * @param string $plaintext The message you're encrypting
+     * @param string $nonce     A Number to be used Once; must be 24 bytes
+     * @param string $key       Symmetric encryption key
+     * @return string           Ciphertext with Poly1305 MAC
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_secretbox_xchacha20poly1305($plaintext, $nonce, $key)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($plaintext, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 2);
+        ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 3);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_SECRETBOX_NONCEBYTES) {
+            throw new SodiumException('Argument 2 must be CRYPTO_SECRETBOX_NONCEBYTES long.');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_SECRETBOX_KEYBYTES) {
+            throw new SodiumException('Argument 3 must be CRYPTO_SECRETBOX_KEYBYTES long.');
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::secretbox_xchacha20poly1305($plaintext, $nonce, $key);
+        }
+        return ParagonIE_Sodium_Crypto::secretbox_xchacha20poly1305($plaintext, $nonce, $key);
+    }
+    /**
+     * Decrypts a message previously encrypted with crypto_secretbox_xchacha20poly1305().
+     *
+     * @param string $ciphertext Ciphertext with Poly1305 MAC
+     * @param string $nonce      A Number to be used Once; must be 24 bytes
+     * @param string $key        Symmetric encryption key
+     * @return string            Original plaintext message
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_secretbox_xchacha20poly1305_open($ciphertext, $nonce, $key)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($ciphertext, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 2);
+        ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 3);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_SECRETBOX_NONCEBYTES) {
+            throw new SodiumException('Argument 2 must be CRYPTO_SECRETBOX_NONCEBYTES long.');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_SECRETBOX_KEYBYTES) {
+            throw new SodiumException('Argument 3 must be CRYPTO_SECRETBOX_KEYBYTES long.');
+        }
+
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::secretbox_xchacha20poly1305_open($ciphertext, $nonce, $key);
+        }
+        return ParagonIE_Sodium_Crypto::secretbox_xchacha20poly1305_open($ciphertext, $nonce, $key);
+    }
+
+    /**
+     * @param string $key
+     * @return array<int, string> Returns a state and a header.
+     * @throws Exception
+     * @throws SodiumException
+     */
+    public static function crypto_secretstream_xchacha20poly1305_init_push($key)
+    {
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::secretstream_xchacha20poly1305_init_push($key);
+        }
+        return ParagonIE_Sodium_Crypto::secretstream_xchacha20poly1305_init_push($key);
+    }
+
+    /**
+     * @param string $header
+     * @param string $key
+     * @return string Returns a state.
+     * @throws Exception
+     */
+    public static function crypto_secretstream_xchacha20poly1305_init_pull($header, $key)
+    {
+        if (ParagonIE_Sodium_Core_Util::strlen($header) < self::CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_HEADERBYTES) {
+            throw new SodiumException(
+                'header size should be SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_HEADERBYTES bytes'
+            );
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::secretstream_xchacha20poly1305_init_pull($key, $header);
+        }
+        return ParagonIE_Sodium_Crypto::secretstream_xchacha20poly1305_init_pull($key, $header);
+    }
+
+    /**
+     * @param string $state
+     * @param string $msg
+     * @param string $aad
+     * @param int $tag
+     * @return string
+     * @throws SodiumException
+     */
+    public static function crypto_secretstream_xchacha20poly1305_push(&$state, $msg, $aad = '', $tag = 0)
+    {
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::secretstream_xchacha20poly1305_push(
+                $state,
+                $msg,
+                $aad,
+                $tag
+            );
+        }
+        return ParagonIE_Sodium_Crypto::secretstream_xchacha20poly1305_push(
+            $state,
+            $msg,
+            $aad,
+            $tag
+        );
+    }
+
+    /**
+     * @param string $state
+     * @param string $msg
+     * @param string $aad
+     * @return bool|array{0: string, 1: int}
+     * @throws SodiumException
+     */
+    public static function crypto_secretstream_xchacha20poly1305_pull(&$state, $msg, $aad = '')
+    {
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::secretstream_xchacha20poly1305_pull(
+                $state,
+                $msg,
+                $aad
+            );
+        }
+        return ParagonIE_Sodium_Crypto::secretstream_xchacha20poly1305_pull(
+            $state,
+            $msg,
+            $aad
+        );
+    }
+
+    /**
+     * @return string
+     * @throws Exception
+     */
+    public static function crypto_secretstream_xchacha20poly1305_keygen()
+    {
+        return random_bytes(self::CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_KEYBYTES);
+    }
+
+    /**
+     * @param string $state
+     * @return void
+     * @throws SodiumException
+     */
+    public static function crypto_secretstream_xchacha20poly1305_rekey(&$state)
+    {
+        if (PHP_INT_SIZE === 4) {
+            ParagonIE_Sodium_Crypto32::secretstream_xchacha20poly1305_rekey($state);
+        } else {
+            ParagonIE_Sodium_Crypto::secretstream_xchacha20poly1305_rekey($state);
+        }
+    }
+
+    /**
+     * Calculates a SipHash-2-4 hash of a message for a given key.
+     *
+     * @param string $message Input message
+     * @param string $key SipHash-2-4 key
+     * @return string         Hash
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     * @psalm-suppress MixedInferredReturnType
+     * @psalm-suppress MixedReturnStatement
+     */
+    public static function crypto_shorthash($message, $key)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($message, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 2);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_SHORTHASH_KEYBYTES) {
+            throw new SodiumException('Argument 2 must be CRYPTO_SHORTHASH_KEYBYTES long.');
+        }
+
+        if (self::useNewSodiumAPI()) {
+            return sodium_crypto_shorthash($message, $key);
+        }
+        if (self::use_fallback('crypto_shorthash')) {
+            return (string) call_user_func('\\Sodium\\crypto_shorthash', $message, $key);
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Core32_SipHash::sipHash24($message, $key);
+        }
+        return ParagonIE_Sodium_Core_SipHash::sipHash24($message, $key);
+    }
+
+    /**
+     * Return a secure random key for use with crypto_shorthash
+     *
+     * @return string
+     * @throws Exception
+     * @throws Error
+     */
+    public static function crypto_shorthash_keygen()
+    {
+        return random_bytes(self::CRYPTO_SHORTHASH_KEYBYTES);
+    }
+
+    /**
+     * Returns a signed message. You probably want crypto_sign_detached()
+     * instead, which only returns the signature.
+     *
+     * Algorithm: Ed25519 (EdDSA over Curve25519)
+     *
+     * @param string $message Message to be signed.
+     * @param string $secretKey Secret signing key.
+     * @return string           Signed message (signature is prefixed).
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     * @psalm-suppress MixedInferredReturnType
+     * @psalm-suppress MixedReturnStatement
+     */
+    public static function crypto_sign($message, $secretKey)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($message, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($secretKey, 'string', 2);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($secretKey) !== self::CRYPTO_SIGN_SECRETKEYBYTES) {
+            throw new SodiumException('Argument 2 must be CRYPTO_SIGN_SECRETKEYBYTES long.');
+        }
+
+        if (self::useNewSodiumAPI()) {
+            return sodium_crypto_sign($message, $secretKey);
+        }
+        if (self::use_fallback('crypto_sign')) {
+            return (string) call_user_func('\\Sodium\\crypto_sign', $message, $secretKey);
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::sign($message, $secretKey);
+        }
+        return ParagonIE_Sodium_Crypto::sign($message, $secretKey);
+    }
+
+    /**
+     * Validates a signed message then returns the message.
+     *
+     * @param string $signedMessage A signed message
+     * @param string $publicKey A public key
+     * @return string               The original message (if the signature is
+     *                              valid for this public key)
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     * @psalm-suppress MixedInferredReturnType
+     * @psalm-suppress MixedReturnStatement
+     */
+    public static function crypto_sign_open($signedMessage, $publicKey)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($signedMessage, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($publicKey, 'string', 2);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($signedMessage) < self::CRYPTO_SIGN_BYTES) {
+            throw new SodiumException('Argument 1 must be at least CRYPTO_SIGN_BYTES long.');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($publicKey) !== self::CRYPTO_SIGN_PUBLICKEYBYTES) {
+            throw new SodiumException('Argument 2 must be CRYPTO_SIGN_PUBLICKEYBYTES long.');
+        }
+
+        if (self::useNewSodiumAPI()) {
+            /**
+             * @psalm-suppress InvalidReturnStatement
+             * @psalm-suppress FalsableReturnStatement
+             */
+            return sodium_crypto_sign_open($signedMessage, $publicKey);
+        }
+        if (self::use_fallback('crypto_sign_open')) {
+            return call_user_func('\\Sodium\\crypto_sign_open', $signedMessage, $publicKey);
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::sign_open($signedMessage, $publicKey);
+        }
+        return ParagonIE_Sodium_Crypto::sign_open($signedMessage, $publicKey);
+    }
+
+    /**
+     * Generate a new random Ed25519 keypair.
+     *
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function crypto_sign_keypair()
+    {
+        if (self::useNewSodiumAPI()) {
+            return sodium_crypto_sign_keypair();
+        }
+        if (self::use_fallback('crypto_sign_keypair')) {
+            return (string) call_user_func('\\Sodium\\crypto_sign_keypair');
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Core32_Ed25519::keypair();
+        }
+        return ParagonIE_Sodium_Core_Ed25519::keypair();
+    }
+
+    /**
+     * @param string $sk
+     * @param string $pk
+     * @return string
+     * @throws SodiumException
+     */
+    public static function crypto_sign_keypair_from_secretkey_and_publickey($sk, $pk)
+    {
+        ParagonIE_Sodium_Core_Util::declareScalarType($sk, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($pk, 'string', 1);
+        $sk = (string) $sk;
+        $pk = (string) $pk;
+
+        if (ParagonIE_Sodium_Core_Util::strlen($sk) !== self::CRYPTO_SIGN_SECRETKEYBYTES) {
+            throw new SodiumException('secretkey should be SODIUM_CRYPTO_SIGN_SECRETKEYBYTES bytes');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($pk) !== self::CRYPTO_SIGN_PUBLICKEYBYTES) {
+            throw new SodiumException('publickey should be SODIUM_CRYPTO_SIGN_PUBLICKEYBYTES bytes');
+        }
+
+        if (self::useNewSodiumAPI()) {
+            return sodium_crypto_sign_keypair_from_secretkey_and_publickey($sk, $pk);
+        }
+        return $sk . $pk;
+    }
+
+    /**
+     * Generate an Ed25519 keypair from a seed.
+     *
+     * @param string $seed Input seed
+     * @return string      Keypair
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_sign_seed_keypair($seed)
+    {
+        ParagonIE_Sodium_Core_Util::declareScalarType($seed, 'string', 1);
+
+        if (self::useNewSodiumAPI()) {
+            return sodium_crypto_sign_seed_keypair($seed);
+        }
+        if (self::use_fallback('crypto_sign_keypair')) {
+            return (string) call_user_func('\\Sodium\\crypto_sign_seed_keypair', $seed);
+        }
+        $publicKey = '';
+        $secretKey = '';
+        if (PHP_INT_SIZE === 4) {
+            ParagonIE_Sodium_Core32_Ed25519::seed_keypair($publicKey, $secretKey, $seed);
+        } else {
+            ParagonIE_Sodium_Core_Ed25519::seed_keypair($publicKey, $secretKey, $seed);
+        }
+        return $secretKey . $publicKey;
+    }
+
+    /**
+     * Extract an Ed25519 public key from an Ed25519 keypair.
+     *
+     * @param string $keypair Keypair
+     * @return string         Public key
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_sign_publickey($keypair)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($keypair, 'string', 1);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_SIGN_KEYPAIRBYTES) {
+            throw new SodiumException('Argument 1 must be CRYPTO_SIGN_KEYPAIRBYTES long.');
+        }
+
+        if (self::useNewSodiumAPI()) {
+            return sodium_crypto_sign_publickey($keypair);
+        }
+        if (self::use_fallback('crypto_sign_publickey')) {
+            return (string) call_user_func('\\Sodium\\crypto_sign_publickey', $keypair);
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Core32_Ed25519::publickey($keypair);
+        }
+        return ParagonIE_Sodium_Core_Ed25519::publickey($keypair);
+    }
+
+    /**
+     * Calculate an Ed25519 public key from an Ed25519 secret key.
+     *
+     * @param string $secretKey Your Ed25519 secret key
+     * @return string           The corresponding Ed25519 public key
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_sign_publickey_from_secretkey($secretKey)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($secretKey, 'string', 1);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($secretKey) !== self::CRYPTO_SIGN_SECRETKEYBYTES) {
+            throw new SodiumException('Argument 1 must be CRYPTO_SIGN_SECRETKEYBYTES long.');
+        }
+
+        if (self::useNewSodiumAPI()) {
+            return sodium_crypto_sign_publickey_from_secretkey($secretKey);
+        }
+        if (self::use_fallback('crypto_sign_publickey_from_secretkey')) {
+            return (string) call_user_func('\\Sodium\\crypto_sign_publickey_from_secretkey', $secretKey);
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Core32_Ed25519::publickey_from_secretkey($secretKey);
+        }
+        return ParagonIE_Sodium_Core_Ed25519::publickey_from_secretkey($secretKey);
+    }
+
+    /**
+     * Extract an Ed25519 secret key from an Ed25519 keypair.
+     *
+     * @param string $keypair Keypair
+     * @return string         Secret key
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_sign_secretkey($keypair)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($keypair, 'string', 1);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_SIGN_KEYPAIRBYTES) {
+            throw new SodiumException('Argument 1 must be CRYPTO_SIGN_KEYPAIRBYTES long.');
+        }
+
+        if (self::useNewSodiumAPI()) {
+            return sodium_crypto_sign_secretkey($keypair);
+        }
+        if (self::use_fallback('crypto_sign_secretkey')) {
+            return (string) call_user_func('\\Sodium\\crypto_sign_secretkey', $keypair);
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Core32_Ed25519::secretkey($keypair);
+        }
+        return ParagonIE_Sodium_Core_Ed25519::secretkey($keypair);
+    }
+
+    /**
+     * Calculate the Ed25519 signature of a message and return ONLY the signature.
+     *
+     * Algorithm: Ed25519 (EdDSA over Curve25519)
+     *
+     * @param string $message Message to be signed
+     * @param string $secretKey Secret signing key
+     * @return string           Digital signature
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_sign_detached($message, $secretKey)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($message, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($secretKey, 'string', 2);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($secretKey) !== self::CRYPTO_SIGN_SECRETKEYBYTES) {
+            throw new SodiumException('Argument 2 must be CRYPTO_SIGN_SECRETKEYBYTES long.');
+        }
+
+        if (self::useNewSodiumAPI()) {
+            return sodium_crypto_sign_detached($message, $secretKey);
+        }
+        if (self::use_fallback('crypto_sign_detached')) {
+            return (string) call_user_func('\\Sodium\\crypto_sign_detached', $message, $secretKey);
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::sign_detached($message, $secretKey);
+        }
+        return ParagonIE_Sodium_Crypto::sign_detached($message, $secretKey);
+    }
+
+    /**
+     * Verify the Ed25519 signature of a message.
+     *
+     * @param string $signature Digital sginature
+     * @param string $message Message to be verified
+     * @param string $publicKey Public key
+     * @return bool             TRUE if this signature is good for this public key;
+     *                          FALSE otherwise
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_sign_verify_detached($signature, $message, $publicKey)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($signature, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($message, 'string', 2);
+        ParagonIE_Sodium_Core_Util::declareScalarType($publicKey, 'string', 3);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($signature) !== self::CRYPTO_SIGN_BYTES) {
+            throw new SodiumException('Argument 1 must be CRYPTO_SIGN_BYTES long.');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($publicKey) !== self::CRYPTO_SIGN_PUBLICKEYBYTES) {
+            throw new SodiumException('Argument 3 must be CRYPTO_SIGN_PUBLICKEYBYTES long.');
+        }
+
+        if (self::useNewSodiumAPI()) {
+            return sodium_crypto_sign_verify_detached($signature, $message, $publicKey);
+        }
+        if (self::use_fallback('crypto_sign_verify_detached')) {
+            return (bool) call_user_func(
+                '\\Sodium\\crypto_sign_verify_detached',
+                $signature,
+                $message,
+                $publicKey
+            );
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Crypto32::sign_verify_detached($signature, $message, $publicKey);
+        }
+        return ParagonIE_Sodium_Crypto::sign_verify_detached($signature, $message, $publicKey);
+    }
+
+    /**
+     * Convert an Ed25519 public key to a Curve25519 public key
+     *
+     * @param string $pk
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_sign_ed25519_pk_to_curve25519($pk)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($pk, 'string', 1);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($pk) < self::CRYPTO_SIGN_PUBLICKEYBYTES) {
+            throw new SodiumException('Argument 1 must be at least CRYPTO_SIGN_PUBLICKEYBYTES long.');
+        }
+        if (self::useNewSodiumAPI()) {
+            if (is_callable('crypto_sign_ed25519_pk_to_curve25519')) {
+                return (string) sodium_crypto_sign_ed25519_pk_to_curve25519($pk);
+            }
+        }
+        if (self::use_fallback('crypto_sign_ed25519_pk_to_curve25519')) {
+            return (string) call_user_func('\\Sodium\\crypto_sign_ed25519_pk_to_curve25519', $pk);
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Core32_Ed25519::pk_to_curve25519($pk);
+        }
+        return ParagonIE_Sodium_Core_Ed25519::pk_to_curve25519($pk);
+    }
+
+    /**
+     * Convert an Ed25519 secret key to a Curve25519 secret key
+     *
+     * @param string $sk
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_sign_ed25519_sk_to_curve25519($sk)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($sk, 'string', 1);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($sk) < self::CRYPTO_SIGN_SEEDBYTES) {
+            throw new SodiumException('Argument 1 must be at least CRYPTO_SIGN_SEEDBYTES long.');
+        }
+        if (self::useNewSodiumAPI()) {
+            if (is_callable('crypto_sign_ed25519_sk_to_curve25519')) {
+                return sodium_crypto_sign_ed25519_sk_to_curve25519($sk);
+            }
+        }
+        if (self::use_fallback('crypto_sign_ed25519_sk_to_curve25519')) {
+            return (string) call_user_func('\\Sodium\\crypto_sign_ed25519_sk_to_curve25519', $sk);
+        }
+
+        $h = hash('sha512', ParagonIE_Sodium_Core_Util::substr($sk, 0, 32), true);
+        $h[0] = ParagonIE_Sodium_Core_Util::intToChr(
+            ParagonIE_Sodium_Core_Util::chrToInt($h[0]) & 248
+        );
+        $h[31] = ParagonIE_Sodium_Core_Util::intToChr(
+            (ParagonIE_Sodium_Core_Util::chrToInt($h[31]) & 127) | 64
+        );
+        return ParagonIE_Sodium_Core_Util::substr($h, 0, 32);
+    }
+
+    /**
+     * Expand a key and nonce into a keystream of pseudorandom bytes.
+     *
+     * @param int $len Number of bytes desired
+     * @param string $nonce Number to be used Once; must be 24 bytes
+     * @param string $key XSalsa20 key
+     * @return string       Pseudorandom stream that can be XORed with messages
+     *                      to provide encryption (but not authentication; see
+     *                      Poly1305 or crypto_auth() for that, which is not
+     *                      optional for security)
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_stream($len, $nonce, $key)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($len, 'int', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 2);
+        ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 3);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_STREAM_NONCEBYTES) {
+            throw new SodiumException('Argument 2 must be CRYPTO_SECRETBOX_NONCEBYTES long.');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_STREAM_KEYBYTES) {
+            throw new SodiumException('Argument 3 must be CRYPTO_STREAM_KEYBYTES long.');
+        }
+
+        if (self::useNewSodiumAPI()) {
+            return sodium_crypto_stream($len, $nonce, $key);
+        }
+        if (self::use_fallback('crypto_stream')) {
+            return (string) call_user_func('\\Sodium\\crypto_stream', $len, $nonce, $key);
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Core32_XSalsa20::xsalsa20($len, $nonce, $key);
+        }
+        return ParagonIE_Sodium_Core_XSalsa20::xsalsa20($len, $nonce, $key);
+    }
+
+    /**
+     * DANGER! UNAUTHENTICATED ENCRYPTION!
+     *
+     * Unless you are following expert advice, do not used this feature.
+     *
+     * Algorithm: XSalsa20
+     *
+     * This DOES NOT provide ciphertext integrity.
+     *
+     * @param string $message Plaintext message
+     * @param string $nonce Number to be used Once; must be 24 bytes
+     * @param string $key Encryption key
+     * @return string         Encrypted text which is vulnerable to chosen-
+     *                        ciphertext attacks unless you implement some
+     *                        other mitigation to the ciphertext (i.e.
+     *                        Encrypt then MAC)
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_stream_xor($message, $nonce, $key)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($message, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 2);
+        ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 3);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_STREAM_NONCEBYTES) {
+            throw new SodiumException('Argument 2 must be CRYPTO_SECRETBOX_NONCEBYTES long.');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_STREAM_KEYBYTES) {
+            throw new SodiumException('Argument 3 must be CRYPTO_SECRETBOX_KEYBYTES long.');
+        }
+
+        if (self::useNewSodiumAPI()) {
+            return sodium_crypto_stream_xor($message, $nonce, $key);
+        }
+        if (self::use_fallback('crypto_stream_xor')) {
+            return (string) call_user_func('\\Sodium\\crypto_stream_xor', $message, $nonce, $key);
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Core32_XSalsa20::xsalsa20_xor($message, $nonce, $key);
+        }
+        return ParagonIE_Sodium_Core_XSalsa20::xsalsa20_xor($message, $nonce, $key);
+    }
+
+    /**
+     * Return a secure random key for use with crypto_stream
+     *
+     * @return string
+     * @throws Exception
+     * @throws Error
+     */
+    public static function crypto_stream_keygen()
+    {
+        return random_bytes(self::CRYPTO_STREAM_KEYBYTES);
+    }
+
+
+    /**
+     * Expand a key and nonce into a keystream of pseudorandom bytes.
+     *
+     * @param int $len Number of bytes desired
+     * @param string $nonce Number to be used Once; must be 24 bytes
+     * @param string $key XChaCha20 key
+     * @param bool $dontFallback
+     * @return string       Pseudorandom stream that can be XORed with messages
+     *                      to provide encryption (but not authentication; see
+     *                      Poly1305 or crypto_auth() for that, which is not
+     *                      optional for security)
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_stream_xchacha20($len, $nonce, $key, $dontFallback = false)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($len, 'int', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 2);
+        ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 3);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_STREAM_XCHACHA20_NONCEBYTES) {
+            throw new SodiumException('Argument 2 must be CRYPTO_SECRETBOX_XCHACHA20_NONCEBYTES long.');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_STREAM_XCHACHA20_KEYBYTES) {
+            throw new SodiumException('Argument 3 must be CRYPTO_STREAM_XCHACHA20_KEYBYTES long.');
+        }
+
+        if (self::useNewSodiumAPI() && !$dontFallback) {
+            return sodium_crypto_stream_xchacha20($len, $nonce, $key);
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Core32_XChaCha20::stream($len, $nonce, $key);
+        }
+        return ParagonIE_Sodium_Core_XChaCha20::stream($len, $nonce, $key);
+    }
+
+    /**
+     * DANGER! UNAUTHENTICATED ENCRYPTION!
+     *
+     * Unless you are following expert advice, do not used this feature.
+     *
+     * Algorithm: XChaCha20
+     *
+     * This DOES NOT provide ciphertext integrity.
+     *
+     * @param string $message Plaintext message
+     * @param string $nonce Number to be used Once; must be 24 bytes
+     * @param string $key Encryption key
+     * @return string         Encrypted text which is vulnerable to chosen-
+     *                        ciphertext attacks unless you implement some
+     *                        other mitigation to the ciphertext (i.e.
+     *                        Encrypt then MAC)
+     * @param bool $dontFallback
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function crypto_stream_xchacha20_xor($message, $nonce, $key, $dontFallback = false)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($message, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 2);
+        ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 3);
+
+        /* Input validation: */
+        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_STREAM_XCHACHA20_NONCEBYTES) {
+            throw new SodiumException('Argument 2 must be CRYPTO_SECRETBOX_XCHACHA20_NONCEBYTES long.');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_STREAM_XCHACHA20_KEYBYTES) {
+            throw new SodiumException('Argument 3 must be CRYPTO_SECRETBOX_XCHACHA20_KEYBYTES long.');
+        }
+
+        if (self::useNewSodiumAPI() && !$dontFallback) {
+            return sodium_crypto_stream_xchacha20_xor($message, $nonce, $key);
+        }
+        if (PHP_INT_SIZE === 4) {
+            return ParagonIE_Sodium_Core32_XChaCha20::streamXorIc($message, $nonce, $key);
+        }
+        return ParagonIE_Sodium_Core_XChaCha20::streamXorIc($message, $nonce, $key);
+    }
+
+    /**
+     * Return a secure random key for use with crypto_stream_xchacha20
+     *
+     * @return string
+     * @throws Exception
+     * @throws Error
+     */
+    public static function crypto_stream_xchacha20_keygen()
+    {
+        return random_bytes(self::CRYPTO_STREAM_XCHACHA20_KEYBYTES);
+    }
+
+    /**
+     * Cache-timing-safe implementation of hex2bin().
+     *
+     * @param string $string Hexadecimal string
+     * @return string        Raw binary string
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress TooFewArguments
+     * @psalm-suppress MixedArgument
+     */
+    public static function hex2bin($string)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($string, 'string', 1);
+
+        if (self::useNewSodiumAPI()) {
+            if (is_callable('sodium_hex2bin')) {
+                return (string) sodium_hex2bin($string);
+            }
+        }
+        if (self::use_fallback('hex2bin')) {
+            return (string) call_user_func('\\Sodium\\hex2bin', $string);
+        }
+        return ParagonIE_Sodium_Core_Util::hex2bin($string);
+    }
+
+    /**
+     * Increase a string (little endian)
+     *
+     * @param string $var
+     *
+     * @return void
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function increment(&$var)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($var, 'string', 1);
+
+        if (self::useNewSodiumAPI()) {
+            sodium_increment($var);
+            return;
+        }
+        if (self::use_fallback('increment')) {
+            $func = '\\Sodium\\increment';
+            $func($var);
+            return;
+        }
+
+        $len = ParagonIE_Sodium_Core_Util::strlen($var);
+        $c = 1;
+        $copy = '';
+        for ($i = 0; $i < $len; ++$i) {
+            $c += ParagonIE_Sodium_Core_Util::chrToInt(
+                ParagonIE_Sodium_Core_Util::substr($var, $i, 1)
+            );
+            $copy .= ParagonIE_Sodium_Core_Util::intToChr($c);
+            $c >>= 8;
+        }
+        $var = $copy;
+    }
+
+    /**
+     * @param string $str
+     * @return bool
+     *
+     * @throws SodiumException
+     */
+    public static function is_zero($str)
+    {
+        $d = 0;
+        for ($i = 0; $i < 32; ++$i) {
+            $d |= ParagonIE_Sodium_Core_Util::chrToInt($str[$i]);
+        }
+        return ((($d - 1) >> 31) & 1) === 1;
+    }
+
+    /**
+     * The equivalent to the libsodium minor version we aim to be compatible
+     * with (sans pwhash and memzero).
+     *
+     * @return int
+     */
+    public static function library_version_major()
+    {
+        if (self::useNewSodiumAPI() && defined('SODIUM_LIBRARY_MAJOR_VERSION')) {
+            return SODIUM_LIBRARY_MAJOR_VERSION;
+        }
+        if (self::use_fallback('library_version_major')) {
+            /** @psalm-suppress UndefinedFunction */
+            return (int) call_user_func('\\Sodium\\library_version_major');
+        }
+        return self::LIBRARY_VERSION_MAJOR;
+    }
+
+    /**
+     * The equivalent to the libsodium minor version we aim to be compatible
+     * with (sans pwhash and memzero).
+     *
+     * @return int
+     */
+    public static function library_version_minor()
+    {
+        if (self::useNewSodiumAPI() && defined('SODIUM_LIBRARY_MINOR_VERSION')) {
+            return SODIUM_LIBRARY_MINOR_VERSION;
+        }
+        if (self::use_fallback('library_version_minor')) {
+            /** @psalm-suppress UndefinedFunction */
+            return (int) call_user_func('\\Sodium\\library_version_minor');
+        }
+        return self::LIBRARY_VERSION_MINOR;
+    }
+
+    /**
+     * Compare two strings.
+     *
+     * @param string $left
+     * @param string $right
+     * @return int
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     */
+    public static function memcmp($left, $right)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($left, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($right, 'string', 2);
+
+        if (self::useNewSodiumAPI()) {
+            return sodium_memcmp($left, $right);
+        }
+        if (self::use_fallback('memcmp')) {
+            return (int) call_user_func('\\Sodium\\memcmp', $left, $right);
+        }
+        /** @var string $left */
+        /** @var string $right */
+        return ParagonIE_Sodium_Core_Util::memcmp($left, $right);
+    }
+
+    /**
+     * It's actually not possible to zero memory buffers in PHP. You need the
+     * native library for that.
+     *
+     * @param string|null $var
+     * @param-out string|null $var
+     *
+     * @return void
+     * @throws SodiumException (Unless libsodium is installed)
+     * @throws TypeError
+     * @psalm-suppress TooFewArguments
+     */
+    public static function memzero(&$var)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($var, 'string', 1);
+
+        if (self::useNewSodiumAPI()) {
+            /** @psalm-suppress MixedArgument */
+            sodium_memzero($var);
+            return;
+        }
+        if (self::use_fallback('memzero')) {
+            $func = '\\Sodium\\memzero';
+            $func($var);
+            if ($var === null) {
+                return;
+            }
+        }
+        // This is the best we can do.
+        throw new SodiumException(
+            'This is not implemented in sodium_compat, as it is not possible to securely wipe memory from PHP. ' .
+            'To fix this error, make sure libsodium is installed and the PHP extension is enabled.'
+        );
+    }
+
+    /**
+     * @param string $unpadded
+     * @param int $blockSize
+     * @param bool $dontFallback
+     * @return string
+     * @throws SodiumException
+     */
+    public static function pad($unpadded, $blockSize, $dontFallback = false)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($unpadded, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($blockSize, 'int', 2);
+
+        $unpadded = (string) $unpadded;
+        $blockSize = (int) $blockSize;
+
+        if (self::useNewSodiumAPI() && !$dontFallback) {
+            return (string) sodium_pad($unpadded, $blockSize);
+        }
+
+        if ($blockSize <= 0) {
+            throw new SodiumException(
+                'block size cannot be less than 1'
+            );
+        }
+        $unpadded_len = ParagonIE_Sodium_Core_Util::strlen($unpadded);
+        $xpadlen = ($blockSize - 1);
+        if (($blockSize & ($blockSize - 1)) === 0) {
+            $xpadlen -= $unpadded_len & ($blockSize - 1);
+        } else {
+            $xpadlen -= $unpadded_len % $blockSize;
+        }
+
+        $xpadded_len = $unpadded_len + $xpadlen;
+        $padded = str_repeat("\0", $xpadded_len - 1);
+        if ($unpadded_len > 0) {
+            $st = 1;
+            $i = 0;
+            $k = $unpadded_len;
+            for ($j = 0; $j <= $xpadded_len; ++$j) {
+                $i = (int) $i;
+                $k = (int) $k;
+                $st = (int) $st;
+                if ($j >= $unpadded_len) {
+                    $padded[$j] = "\0";
+                } else {
+                    $padded[$j] = $unpadded[$j];
+                }
+                /** @var int $k */
+                $k -= $st;
+                $st = (int) (~(
+                            (
+                                (
+                                    ($k >> 48)
+                                        |
+                                    ($k >> 32)
+                                        |
+                                    ($k >> 16)
+                                        |
+                                    $k
+                                ) - 1
+                            ) >> 16
+                        )
+                    ) & 1;
+                $i += $st;
+            }
+        }
+
+        $mask = 0;
+        $tail = $xpadded_len;
+        for ($i = 0; $i < $blockSize; ++$i) {
+            # barrier_mask = (unsigned char)
+            #     (((i ^ xpadlen) - 1U) >> ((sizeof(size_t) - 1U) * CHAR_BIT));
+            $barrier_mask = (($i ^ $xpadlen) -1) >> ((PHP_INT_SIZE << 3) - 1);
+            # tail[-i] = (tail[-i] & mask) | (0x80 & barrier_mask);
+            $padded[$tail - $i] = ParagonIE_Sodium_Core_Util::intToChr(
+                (ParagonIE_Sodium_Core_Util::chrToInt($padded[$tail - $i]) & $mask)
+                    |
+                (0x80 & $barrier_mask)
+            );
+            # mask |= barrier_mask;
+            $mask |= $barrier_mask;
+        }
+        return $padded;
+    }
+
+    /**
+     * @param string $padded
+     * @param int $blockSize
+     * @param bool $dontFallback
+     * @return string
+     * @throws SodiumException
+     */
+    public static function unpad($padded, $blockSize, $dontFallback = false)
+    {
+        /* Type checks: */
+        ParagonIE_Sodium_Core_Util::declareScalarType($padded, 'string', 1);
+        ParagonIE_Sodium_Core_Util::declareScalarType($blockSize, 'int', 2);
+
+        $padded = (string) $padded;
+        $blockSize = (int) $blockSize;
+
+        if (self::useNewSodiumAPI() && !$dontFallback) {
+            return (string) sodium_unpad($padded, $blockSize);
+        }
+        if ($blockSize <= 0) {
+            throw new SodiumException('block size cannot be less than 1');
+        }
+        $padded_len = ParagonIE_Sodium_Core_Util::strlen($padded);
+        if ($padded_len < $blockSize) {
+            throw new SodiumException('invalid padding');
+        }
+
+        # tail = &padded[padded_len - 1U];
+        $tail = $padded_len - 1;
+
+        $acc = 0;
+        $valid = 0;
+        $pad_len = 0;
+
+        $found = 0;
+        for ($i = 0; $i < $blockSize; ++$i) {
+            # c = tail[-i];
+            $c = ParagonIE_Sodium_Core_Util::chrToInt($padded[$tail - $i]);
+
+            # is_barrier =
+            #     (( (acc - 1U) & (pad_len - 1U) & ((c ^ 0x80) - 1U) ) >> 8) & 1U;
+            $is_barrier = (
+                (
+                    ($acc - 1) & ($pad_len - 1) & (($c ^ 80) - 1)
+                ) >> 7
+            ) & 1;
+            $is_barrier &= ~$found;
+            $found |= $is_barrier;
+
+            # acc |= c;
+            $acc |= $c;
+
+            # pad_len |= i & (1U + ~is_barrier);
+            $pad_len |= $i & (1 + ~$is_barrier);
+
+            # valid |= (unsigned char) is_barrier;
+            $valid |= ($is_barrier & 0xff);
+        }
+        # unpadded_len = padded_len - 1U - pad_len;
+        $unpadded_len = $padded_len - 1 - $pad_len;
+        if ($valid !== 1) {
+            throw new SodiumException('invalid padding');
+        }
+        return ParagonIE_Sodium_Core_Util::substr($padded, 0, $unpadded_len);
+    }
+
+    /**
+     * Will sodium_compat run fast on the current hardware and PHP configuration?
+     *
+     * @return bool
+     */
+    public static function polyfill_is_fast()
+    {
+        if (extension_loaded('sodium')) {
+            return true;
+        }
+        if (extension_loaded('libsodium')) {
+            return true;
+        }
+        return PHP_INT_SIZE === 8;
+    }
+
+    /**
+     * Generate a string of bytes from the kernel's CSPRNG.
+     * Proudly uses /dev/urandom (if getrandom(2) is not available).
+     *
+     * @param int $numBytes
+     * @return string
+     * @throws Exception
+     * @throws TypeError
+     */
+    public static function randombytes_buf($numBytes)
+    {
+        /* Type checks: */
+        if (!is_int($numBytes)) {
+            if (is_numeric($numBytes)) {
+                $numBytes = (int) $numBytes;
+            } else {
+                throw new TypeError(
+                    'Argument 1 must be an integer, ' . gettype($numBytes) . ' given.'
+                );
+            }
+        }
+        if (self::use_fallback('randombytes_buf')) {
+            return (string) call_user_func('\\Sodium\\randombytes_buf', $numBytes);
+        }
+        return random_bytes($numBytes);
+    }
+
+    /**
+     * Generate an integer between 0 and $range (non-inclusive).
+     *
+     * @param int $range
+     * @return int
+     * @throws Exception
+     * @throws Error
+     * @throws TypeError
+     */
+    public static function randombytes_uniform($range)
+    {
+        /* Type checks: */
+        if (!is_int($range)) {
+            if (is_numeric($range)) {
+                $range = (int) $range;
+            } else {
+                throw new TypeError(
+                    'Argument 1 must be an integer, ' . gettype($range) . ' given.'
+                );
+            }
+        }
+        if (self::use_fallback('randombytes_uniform')) {
+            return (int) call_user_func('\\Sodium\\randombytes_uniform', $range);
+        }
+        return random_int(0, $range - 1);
+    }
+
+    /**
+     * Generate a random 16-bit integer.
+     *
+     * @return int
+     * @throws Exception
+     * @throws Error
+     * @throws TypeError
+     */
+    public static function randombytes_random16()
+    {
+        if (self::use_fallback('randombytes_random16')) {
+            return (int) call_user_func('\\Sodium\\randombytes_random16');
+        }
+        return random_int(0, 65535);
+    }
+
+    /**
+     * @param string $p
+     * @param bool $dontFallback
+     * @return bool
+     * @throws SodiumException
+     */
+    public static function ristretto255_is_valid_point($p, $dontFallback = false)
+    {
+        if (self::useNewSodiumAPI() && !$dontFallback) {
+            return sodium_crypto_core_ristretto255_is_valid_point($p);
+        }
+        try {
+            $r = ParagonIE_Sodium_Core_Ristretto255::ristretto255_frombytes($p);
+            return $r['res'] === 0 &&
+                ParagonIE_Sodium_Core_Ristretto255::ristretto255_point_is_canonical($p) === 1;
+        } catch (SodiumException $ex) {
+            if ($ex->getMessage() === 'S is not canonical') {
+                return false;
+            }
+            throw $ex;
+        }
+    }
+
+    /**
+     * @param string $p
+     * @param string $q
+     * @param bool $dontFallback
+     * @return string
+     * @throws SodiumException
+     */
+    public static function ristretto255_add($p, $q, $dontFallback = false)
+    {
+        if (self::useNewSodiumAPI() && !$dontFallback) {
+            return sodium_crypto_core_ristretto255_add($p, $q);
+        }
+        return ParagonIE_Sodium_Core_Ristretto255::ristretto255_add($p, $q);
+    }
+
+    /**
+     * @param string $p
+     * @param string $q
+     * @param bool $dontFallback
+     * @return string
+     * @throws SodiumException
+     */
+    public static function ristretto255_sub($p, $q, $dontFallback = false)
+    {
+        if (self::useNewSodiumAPI() && !$dontFallback) {
+            return sodium_crypto_core_ristretto255_sub($p, $q);
+        }
+        return ParagonIE_Sodium_Core_Ristretto255::ristretto255_sub($p, $q);
+    }
+
+    /**
+     * @param string $r
+     * @param bool $dontFallback
+     * @return string
+     *
+     * @throws SodiumException
+     */
+    public static function ristretto255_from_hash($r, $dontFallback = false)
+    {
+        if (self::useNewSodiumAPI() && !$dontFallback) {
+            return sodium_crypto_core_ristretto255_from_hash($r);
+        }
+        return ParagonIE_Sodium_Core_Ristretto255::ristretto255_from_hash($r);
+    }
+
+    /**
+     * @param bool $dontFallback
+     * @return string
+     *
+     * @throws SodiumException
+     */
+    public static function ristretto255_random($dontFallback = false)
+    {
+        if (self::useNewSodiumAPI() && !$dontFallback) {
+            return sodium_crypto_core_ristretto255_random();
+        }
+        return ParagonIE_Sodium_Core_Ristretto255::ristretto255_random();
+    }
+
+    /**
+     * @param bool $dontFallback
+     * @return string
+     *
+     * @throws SodiumException
+     */
+    public static function ristretto255_scalar_random($dontFallback = false)
+    {
+        if (self::useNewSodiumAPI() && !$dontFallback) {
+            return sodium_crypto_core_ristretto255_scalar_random();
+        }
+        return ParagonIE_Sodium_Core_Ristretto255::ristretto255_scalar_random();
+    }
+
+    /**
+     * @param string $s
+     * @param bool $dontFallback
+     * @return string
+     * @throws SodiumException
+     */
+    public static function ristretto255_scalar_invert($s, $dontFallback = false)
+    {
+        if (self::useNewSodiumAPI() && !$dontFallback) {
+            return sodium_crypto_core_ristretto255_scalar_invert($s);
+        }
+        return ParagonIE_Sodium_Core_Ristretto255::ristretto255_scalar_invert($s);
+    }
+    /**
+     * @param string $s
+     * @param bool $dontFallback
+     * @return string
+     * @throws SodiumException
+     */
+    public static function ristretto255_scalar_negate($s, $dontFallback = false)
+    {
+        if (self::useNewSodiumAPI() && !$dontFallback) {
+            return sodium_crypto_core_ristretto255_scalar_negate($s);
+        }
+        return ParagonIE_Sodium_Core_Ristretto255::ristretto255_scalar_negate($s);
+    }
+
+    /**
+     * @param string $s
+     * @param bool $dontFallback
+     * @return string
+     * @throws SodiumException
+     */
+    public static function ristretto255_scalar_complement($s, $dontFallback = false)
+    {
+        if (self::useNewSodiumAPI() && !$dontFallback) {
+            return sodium_crypto_core_ristretto255_scalar_complement($s);
+        }
+        return ParagonIE_Sodium_Core_Ristretto255::ristretto255_scalar_complement($s);
+    }
+
+    /**
+     * @param string $x
+     * @param string $y
+     * @param bool $dontFallback
+     * @return string
+     * @throws SodiumException
+     */
+    public static function ristretto255_scalar_add($x, $y, $dontFallback = false)
+    {
+        if (self::useNewSodiumAPI() && !$dontFallback) {
+            return sodium_crypto_core_ristretto255_scalar_add($x, $y);
+        }
+        return ParagonIE_Sodium_Core_Ristretto255::ristretto255_scalar_add($x, $y);
+    }
+
+    /**
+     * @param string $x
+     * @param string $y
+     * @param bool $dontFallback
+     * @return string
+     * @throws SodiumException
+     */
+    public static function ristretto255_scalar_sub($x, $y, $dontFallback = false)
+    {
+        if (self::useNewSodiumAPI() && !$dontFallback) {
+            return sodium_crypto_core_ristretto255_scalar_sub($x, $y);
+        }
+        return ParagonIE_Sodium_Core_Ristretto255::ristretto255_scalar_sub($x, $y);
+    }
+
+    /**
+     * @param string $x
+     * @param string $y
+     * @param bool $dontFallback
+     * @return string
+     * @throws SodiumException
+     */
+    public static function ristretto255_scalar_mul($x, $y, $dontFallback = false)
+    {
+        if (self::useNewSodiumAPI() && !$dontFallback) {
+            return sodium_crypto_core_ristretto255_scalar_mul($x, $y);
+        }
+        return ParagonIE_Sodium_Core_Ristretto255::ristretto255_scalar_mul($x, $y);
+    }
+
+    /**
+     * @param string $n
+     * @param string $p
+     * @param bool $dontFallback
+     * @return string
+     * @throws SodiumException
+     */
+    public static function scalarmult_ristretto255($n, $p, $dontFallback = false)
+    {
+        if (self::useNewSodiumAPI() && !$dontFallback) {
+            return sodium_crypto_scalarmult_ristretto255($n, $p);
+        }
+        return ParagonIE_Sodium_Core_Ristretto255::scalarmult_ristretto255($n, $p);
+    }
+
+    /**
+     * @param string $n
+     * @param string $p
+     * @param bool $dontFallback
+     * @return string
+     * @throws SodiumException
+     */
+    public static function scalarmult_ristretto255_base($n, $dontFallback = false)
+    {
+        if (self::useNewSodiumAPI() && !$dontFallback) {
+            return sodium_crypto_scalarmult_ristretto255_base($n);
+        }
+        return ParagonIE_Sodium_Core_Ristretto255::scalarmult_ristretto255_base($n);
+    }
+
+    /**
+     * @param string $s
+     * @param bool $dontFallback
+     * @return string
+     * @throws SodiumException
+     */
+    public static function ristretto255_scalar_reduce($s, $dontFallback = false)
+    {
+        if (self::useNewSodiumAPI() && !$dontFallback) {
+            return sodium_crypto_core_ristretto255_scalar_reduce($s);
+        }
+        return ParagonIE_Sodium_Core_Ristretto255::sc_reduce($s);
+    }
+
+    /**
+     * Runtime testing method for 32-bit platforms.
+     *
+     * Usage: If runtime_speed_test() returns FALSE, then our 32-bit
+     *        implementation is to slow to use safely without risking timeouts.
+     *        If this happens, install sodium from PECL to get acceptable
+     *        performance.
+     *
+     * @param int $iterations Number of multiplications to attempt
+     * @param int $maxTimeout Milliseconds
+     * @return bool           TRUE if we're fast enough, FALSE is not
+     * @throws SodiumException
+     */
+    public static function runtime_speed_test($iterations, $maxTimeout)
+    {
+        if (self::polyfill_is_fast()) {
+            return true;
+        }
+        /** @var float $end */
+        $end = 0.0;
+        /** @var float $start */
+        $start = microtime(true);
+        /** @var ParagonIE_Sodium_Core32_Int64 $a */
+        $a = ParagonIE_Sodium_Core32_Int64::fromInt(random_int(3, 1 << 16));
+        for ($i = 0; $i < $iterations; ++$i) {
+            /** @var ParagonIE_Sodium_Core32_Int64 $b */
+            $b = ParagonIE_Sodium_Core32_Int64::fromInt(random_int(3, 1 << 16));
+            $a->mulInt64($b);
+        }
+        /** @var float $end */
+        $end = microtime(true);
+        /** @var int $diff */
+        $diff = (int) ceil(($end - $start) * 1000);
+        return $diff < $maxTimeout;
+    }
+
+    /**
+     * Add two numbers (little-endian unsigned), storing the value in the first
+     * parameter.
+     *
+     * This mutates $val.
+     *
+     * @param string $val
+     * @param string $addv
+     * @return void
+     * @throws SodiumException
+     */
+    public static function sub(&$val, $addv)
+    {
+        $val_len = ParagonIE_Sodium_Core_Util::strlen($val);
+        $addv_len = ParagonIE_Sodium_Core_Util::strlen($addv);
+        if ($val_len !== $addv_len) {
+            throw new SodiumException('values must have the same length');
+        }
+        $A = ParagonIE_Sodium_Core_Util::stringToIntArray($val);
+        $B = ParagonIE_Sodium_Core_Util::stringToIntArray($addv);
+
+        $c = 0;
+        for ($i = 0; $i < $val_len; $i++) {
+            $c = ($A[$i] - $B[$i] - $c);
+            $A[$i] = ($c & 0xff);
+            $c = ($c >> 8) & 1;
+        }
+        $val = ParagonIE_Sodium_Core_Util::intArrayToString($A);
+    }
+
+    /**
+     * This emulates libsodium's version_string() function, except ours is
+     * prefixed with 'polyfill-'.
+     *
+     * @return string
+     * @psalm-suppress MixedInferredReturnType
+     * @psalm-suppress UndefinedFunction
+     */
+    public static function version_string()
+    {
+        if (self::useNewSodiumAPI()) {
+            return (string) sodium_version_string();
+        }
+        if (self::use_fallback('version_string')) {
+            return (string) call_user_func('\\Sodium\\version_string');
+        }
+        return (string) self::VERSION_STRING;
+    }
+
+    /**
+     * Should we use the libsodium core function instead?
+     * This is always a good idea, if it's available. (Unless we're in the
+     * middle of running our unit test suite.)
+     *
+     * If ext/libsodium is available, use it. Return TRUE.
+     * Otherwise, we have to use the code provided herein. Return FALSE.
+     *
+     * @param string $sodium_func_name
+     *
+     * @return bool
+     */
+    protected static function use_fallback($sodium_func_name = '')
+    {
+        static $res = null;
+        if ($res === null) {
+            $res = extension_loaded('libsodium') && PHP_VERSION_ID >= 50300;
+        }
+        if ($res === false) {
+            // No libsodium installed
+            return false;
+        }
+        if (self::$disableFallbackForUnitTests) {
+            // Don't fallback. Use the PHP implementation.
+            return false;
+        }
+        if (!empty($sodium_func_name)) {
+            return is_callable('\\Sodium\\' . $sodium_func_name);
+        }
+        return true;
+    }
+
+    /**
+     * Libsodium as implemented in PHP 7.2
+     * and/or ext/sodium (via PECL)
+     *
+     * @ref https://wiki.php.net/rfc/libsodium
+     * @return bool
+     */
+    protected static function useNewSodiumAPI()
+    {
+        static $res = null;
+        if ($res === null) {
+            $res = PHP_VERSION_ID >= 70000 && extension_loaded('sodium');
+        }
+        if (self::$disableFallbackForUnitTests) {
+            // Don't fallback. Use the PHP implementation.
+            return false;
+        }
+        return (bool) $res;
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core/BLAKE2b.php b/vendor/paragonie/sodium_compat/src/Core/BLAKE2b.php
new file mode 100644
index 0000000..99bae98
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core/BLAKE2b.php
@@ -0,0 +1,790 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core_BLAKE2b', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core_BLAKE2b
+ *
+ * Based on the work of Devi Mandiri in devi/salt.
+ */
+abstract class ParagonIE_Sodium_Core_BLAKE2b extends ParagonIE_Sodium_Core_Util
+{
+    /**
+     * @var SplFixedArray
+     */
+    protected static $iv;
+
+    /**
+     * @var array<int, array<int, int>>
+     */
+    protected static $sigma = array(
+        array(  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15),
+        array( 14, 10,  4,  8,  9, 15, 13,  6,  1, 12,  0,  2, 11,  7,  5,  3),
+        array( 11,  8, 12,  0,  5,  2, 15, 13, 10, 14,  3,  6,  7,  1,  9,  4),
+        array(  7,  9,  3,  1, 13, 12, 11, 14,  2,  6,  5, 10,  4,  0, 15,  8),
+        array(  9,  0,  5,  7,  2,  4, 10, 15, 14,  1, 11, 12,  6,  8,  3, 13),
+        array(  2, 12,  6, 10,  0, 11,  8,  3,  4, 13,  7,  5, 15, 14,  1,  9),
+        array( 12,  5,  1, 15, 14, 13,  4, 10,  0,  7,  6,  3,  9,  2,  8, 11),
+        array( 13, 11,  7, 14, 12,  1,  3,  9,  5,  0, 15,  4,  8,  6,  2, 10),
+        array(  6, 15, 14,  9, 11,  3,  0,  8, 12,  2, 13,  7,  1,  4, 10,  5),
+        array( 10,  2,  8,  4,  7,  6,  1,  5, 15, 11,  9, 14,  3, 12, 13 , 0),
+        array(  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15),
+        array( 14, 10,  4,  8,  9, 15, 13,  6,  1, 12,  0,  2, 11,  7,  5,  3)
+    );
+
+    const BLOCKBYTES = 128;
+    const OUTBYTES   = 64;
+    const KEYBYTES   = 64;
+
+    /**
+     * Turn two 32-bit integers into a fixed array representing a 64-bit integer.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param int $high
+     * @param int $low
+     * @return SplFixedArray
+     * @psalm-suppress MixedAssignment
+     */
+    public static function new64($high, $low)
+    {
+        $i64 = new SplFixedArray(2);
+        $i64[0] = $high & 0xffffffff;
+        $i64[1] = $low & 0xffffffff;
+        return $i64;
+    }
+
+    /**
+     * Convert an arbitrary number into an SplFixedArray of two 32-bit integers
+     * that represents a 64-bit integer.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param int $num
+     * @return SplFixedArray
+     */
+    protected static function to64($num)
+    {
+        list($hi, $lo) = self::numericTo64BitInteger($num);
+        return self::new64($hi, $lo);
+    }
+
+    /**
+     * Adds two 64-bit integers together, returning their sum as a SplFixedArray
+     * containing two 32-bit integers (representing a 64-bit integer).
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param SplFixedArray $x
+     * @param SplFixedArray $y
+     * @return SplFixedArray
+     * @psalm-suppress MixedArgument
+     * @psalm-suppress MixedAssignment
+     * @psalm-suppress MixedOperand
+     */
+    protected static function add64($x, $y)
+    {
+        $l = ($x[1] + $y[1]) & 0xffffffff;
+        return self::new64(
+            (int) ($x[0] + $y[0] + (
+                ($l < $x[1]) ? 1 : 0
+            )),
+            (int) $l
+        );
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param SplFixedArray $x
+     * @param SplFixedArray $y
+     * @param SplFixedArray $z
+     * @return SplFixedArray
+     */
+    protected static function add364($x, $y, $z)
+    {
+        return self::add64($x, self::add64($y, $z));
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param SplFixedArray $x
+     * @param SplFixedArray $y
+     * @return SplFixedArray
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    protected static function xor64(SplFixedArray $x, SplFixedArray $y)
+    {
+        if (!is_numeric($x[0])) {
+            throw new SodiumException('x[0] is not an integer');
+        }
+        if (!is_numeric($x[1])) {
+            throw new SodiumException('x[1] is not an integer');
+        }
+        if (!is_numeric($y[0])) {
+            throw new SodiumException('y[0] is not an integer');
+        }
+        if (!is_numeric($y[1])) {
+            throw new SodiumException('y[1] is not an integer');
+        }
+        return self::new64(
+            (int) (($x[0] ^ $y[0]) & 0xffffffff),
+            (int) (($x[1] ^ $y[1]) & 0xffffffff)
+        );
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param SplFixedArray $x
+     * @param int $c
+     * @return SplFixedArray
+     * @psalm-suppress MixedAssignment
+     */
+    public static function rotr64($x, $c)
+    {
+        if ($c >= 64) {
+            $c %= 64;
+        }
+        if ($c >= 32) {
+            /** @var int $tmp */
+            $tmp = $x[0];
+            $x[0] = $x[1];
+            $x[1] = $tmp;
+            $c -= 32;
+        }
+        if ($c === 0) {
+            return $x;
+        }
+
+        $l0 = 0;
+        $c = 64 - $c;
+
+        if ($c < 32) {
+            /** @var int $h0 */
+            $h0 = ((int) ($x[0]) << $c) | (
+                (
+                    (int) ($x[1]) & ((1 << $c) - 1)
+                        <<
+                    (32 - $c)
+                ) >> (32 - $c)
+            );
+            /** @var int $l0 */
+            $l0 = (int) ($x[1]) << $c;
+        } else {
+            /** @var int $h0 */
+            $h0 = (int) ($x[1]) << ($c - 32);
+        }
+
+        $h1 = 0;
+        $c1 = 64 - $c;
+
+        if ($c1 < 32) {
+            /** @var int $h1 */
+            $h1 = (int) ($x[0]) >> $c1;
+            /** @var int $l1 */
+            $l1 = ((int) ($x[1]) >> $c1) | ((int) ($x[0]) & ((1 << $c1) - 1)) << (32 - $c1);
+        } else {
+            /** @var int $l1 */
+            $l1 = (int) ($x[0]) >> ($c1 - 32);
+        }
+
+        return self::new64($h0 | $h1, $l0 | $l1);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param SplFixedArray $x
+     * @return int
+     * @psalm-suppress MixedOperand
+     */
+    protected static function flatten64($x)
+    {
+        return (int) ($x[0] * 4294967296 + $x[1]);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param SplFixedArray $x
+     * @param int $i
+     * @return SplFixedArray
+     * @psalm-suppress MixedArgument
+     * @psalm-suppress MixedArrayOffset
+     */
+    protected static function load64(SplFixedArray $x, $i)
+    {
+        /** @var int $l */
+        $l = (int) ($x[$i])
+             | ((int) ($x[$i+1]) << 8)
+             | ((int) ($x[$i+2]) << 16)
+             | ((int) ($x[$i+3]) << 24);
+        /** @var int $h */
+        $h = (int) ($x[$i+4])
+             | ((int) ($x[$i+5]) << 8)
+             | ((int) ($x[$i+6]) << 16)
+             | ((int) ($x[$i+7]) << 24);
+        return self::new64($h, $l);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param SplFixedArray $x
+     * @param int $i
+     * @param SplFixedArray $u
+     * @return void
+     * @psalm-suppress MixedAssignment
+     */
+    protected static function store64(SplFixedArray $x, $i, SplFixedArray $u)
+    {
+        $maxLength = $x->getSize() - 1;
+        for ($j = 0; $j < 8; ++$j) {
+            /*
+               [0, 1, 2, 3, 4, 5, 6, 7]
+                    ... becomes ...
+               [0, 0, 0, 0, 1, 1, 1, 1]
+            */
+            /** @var int $uIdx */
+            $uIdx = ((7 - $j) & 4) >> 2;
+            $x[$i]   = ((int) ($u[$uIdx]) & 0xff);
+            if (++$i > $maxLength) {
+                return;
+            }
+            /** @psalm-suppress MixedOperand */
+            $u[$uIdx] >>= 8;
+        }
+    }
+
+    /**
+     * This just sets the $iv static variable.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @return void
+     */
+    public static function pseudoConstructor()
+    {
+        static $called = false;
+        if ($called) {
+            return;
+        }
+        self::$iv = new SplFixedArray(8);
+        self::$iv[0] = self::new64(0x6a09e667, 0xf3bcc908);
+        self::$iv[1] = self::new64(0xbb67ae85, 0x84caa73b);
+        self::$iv[2] = self::new64(0x3c6ef372, 0xfe94f82b);
+        self::$iv[3] = self::new64(0xa54ff53a, 0x5f1d36f1);
+        self::$iv[4] = self::new64(0x510e527f, 0xade682d1);
+        self::$iv[5] = self::new64(0x9b05688c, 0x2b3e6c1f);
+        self::$iv[6] = self::new64(0x1f83d9ab, 0xfb41bd6b);
+        self::$iv[7] = self::new64(0x5be0cd19, 0x137e2179);
+
+        $called = true;
+    }
+
+    /**
+     * Returns a fresh BLAKE2 context.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @return SplFixedArray
+     * @psalm-suppress MixedAssignment
+     * @psalm-suppress MixedArrayAccess
+     * @psalm-suppress MixedArrayAssignment
+     */
+    protected static function context()
+    {
+        $ctx    = new SplFixedArray(6);
+        $ctx[0] = new SplFixedArray(8);   // h
+        $ctx[1] = new SplFixedArray(2);   // t
+        $ctx[2] = new SplFixedArray(2);   // f
+        $ctx[3] = new SplFixedArray(256); // buf
+        $ctx[4] = 0;                      // buflen
+        $ctx[5] = 0;                      // last_node (uint8_t)
+
+        for ($i = 8; $i--;) {
+            $ctx[0][$i] = self::$iv[$i];
+        }
+        for ($i = 256; $i--;) {
+            $ctx[3][$i] = 0;
+        }
+
+        $zero = self::new64(0, 0);
+        $ctx[1][0] = $zero;
+        $ctx[1][1] = $zero;
+        $ctx[2][0] = $zero;
+        $ctx[2][1] = $zero;
+
+        return $ctx;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param SplFixedArray $ctx
+     * @param SplFixedArray $buf
+     * @return void
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     * @psalm-suppress MixedAssignment
+     * @psalm-suppress MixedArrayAccess
+     * @psalm-suppress MixedArrayAssignment
+     * @psalm-suppress MixedArrayOffset
+     */
+    protected static function compress(SplFixedArray $ctx, SplFixedArray $buf)
+    {
+        $m = new SplFixedArray(16);
+        $v = new SplFixedArray(16);
+
+        for ($i = 16; $i--;) {
+            $m[$i] = self::load64($buf, $i << 3);
+        }
+
+        for ($i = 8; $i--;) {
+            $v[$i] = $ctx[0][$i];
+        }
+
+        $v[ 8] = self::$iv[0];
+        $v[ 9] = self::$iv[1];
+        $v[10] = self::$iv[2];
+        $v[11] = self::$iv[3];
+
+        $v[12] = self::xor64($ctx[1][0], self::$iv[4]);
+        $v[13] = self::xor64($ctx[1][1], self::$iv[5]);
+        $v[14] = self::xor64($ctx[2][0], self::$iv[6]);
+        $v[15] = self::xor64($ctx[2][1], self::$iv[7]);
+
+        for ($r = 0; $r < 12; ++$r) {
+            $v = self::G($r, 0, 0, 4, 8, 12, $v, $m);
+            $v = self::G($r, 1, 1, 5, 9, 13, $v, $m);
+            $v = self::G($r, 2, 2, 6, 10, 14, $v, $m);
+            $v = self::G($r, 3, 3, 7, 11, 15, $v, $m);
+            $v = self::G($r, 4, 0, 5, 10, 15, $v, $m);
+            $v = self::G($r, 5, 1, 6, 11, 12, $v, $m);
+            $v = self::G($r, 6, 2, 7, 8, 13, $v, $m);
+            $v = self::G($r, 7, 3, 4, 9, 14, $v, $m);
+        }
+
+        for ($i = 8; $i--;) {
+            $ctx[0][$i] = self::xor64(
+                $ctx[0][$i], self::xor64($v[$i], $v[$i+8])
+            );
+        }
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param int $r
+     * @param int $i
+     * @param int $a
+     * @param int $b
+     * @param int $c
+     * @param int $d
+     * @param SplFixedArray $v
+     * @param SplFixedArray $m
+     * @return SplFixedArray
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     * @psalm-suppress MixedArrayOffset
+     */
+    public static function G($r, $i, $a, $b, $c, $d, SplFixedArray $v, SplFixedArray $m)
+    {
+        $v[$a] = self::add364($v[$a], $v[$b], $m[self::$sigma[$r][$i << 1]]);
+        $v[$d] = self::rotr64(self::xor64($v[$d], $v[$a]), 32);
+        $v[$c] = self::add64($v[$c], $v[$d]);
+        $v[$b] = self::rotr64(self::xor64($v[$b], $v[$c]), 24);
+        $v[$a] = self::add364($v[$a], $v[$b], $m[self::$sigma[$r][($i << 1) + 1]]);
+        $v[$d] = self::rotr64(self::xor64($v[$d], $v[$a]), 16);
+        $v[$c] = self::add64($v[$c], $v[$d]);
+        $v[$b] = self::rotr64(self::xor64($v[$b], $v[$c]), 63);
+        return $v;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param SplFixedArray $ctx
+     * @param int $inc
+     * @return void
+     * @throws SodiumException
+     * @psalm-suppress MixedArgument
+     * @psalm-suppress MixedArrayAccess
+     * @psalm-suppress MixedArrayAssignment
+     */
+    public static function increment_counter($ctx, $inc)
+    {
+        if ($inc < 0) {
+            throw new SodiumException('Increasing by a negative number makes no sense.');
+        }
+        $t = self::to64($inc);
+        # S->t is $ctx[1] in our implementation
+
+        # S->t[0] = ( uint64_t )( t >> 0 );
+        $ctx[1][0] = self::add64($ctx[1][0], $t);
+
+        # S->t[1] += ( S->t[0] < inc );
+        if (self::flatten64($ctx[1][0]) < $inc) {
+            $ctx[1][1] = self::add64($ctx[1][1], self::to64(1));
+        }
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param SplFixedArray $ctx
+     * @param SplFixedArray $p
+     * @param int $plen
+     * @return void
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     * @psalm-suppress MixedAssignment
+     * @psalm-suppress MixedArrayAccess
+     * @psalm-suppress MixedArrayAssignment
+     * @psalm-suppress MixedArrayOffset
+     * @psalm-suppress MixedOperand
+     */
+    public static function update(SplFixedArray $ctx, SplFixedArray $p, $plen)
+    {
+        self::pseudoConstructor();
+
+        $offset = 0;
+        while ($plen > 0) {
+            $left = $ctx[4];
+            $fill = 256 - $left;
+
+            if ($plen > $fill) {
+                # memcpy( S->buf + left, in, fill ); /* Fill buffer */
+                for ($i = $fill; $i--;) {
+                    $ctx[3][$i + $left] = $p[$i + $offset];
+                }
+
+                # S->buflen += fill;
+                $ctx[4] += $fill;
+
+                # blake2b_increment_counter( S, BLAKE2B_BLOCKBYTES );
+                self::increment_counter($ctx, 128);
+
+                # blake2b_compress( S, S->buf ); /* Compress */
+                self::compress($ctx, $ctx[3]);
+
+                # memcpy( S->buf, S->buf + BLAKE2B_BLOCKBYTES, BLAKE2B_BLOCKBYTES ); /* Shift buffer left */
+                for ($i = 128; $i--;) {
+                    $ctx[3][$i] = $ctx[3][$i + 128];
+                }
+
+                # S->buflen -= BLAKE2B_BLOCKBYTES;
+                $ctx[4] -= 128;
+
+                # in += fill;
+                $offset += $fill;
+
+                # inlen -= fill;
+                $plen -= $fill;
+            } else {
+                for ($i = $plen; $i--;) {
+                    $ctx[3][$i + $left] = $p[$i + $offset];
+                }
+                $ctx[4] += $plen;
+                $offset += $plen;
+                $plen -= $plen;
+            }
+        }
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param SplFixedArray $ctx
+     * @param SplFixedArray $out
+     * @return SplFixedArray
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     * @psalm-suppress MixedAssignment
+     * @psalm-suppress MixedArrayAccess
+     * @psalm-suppress MixedArrayAssignment
+     * @psalm-suppress MixedArrayOffset
+     * @psalm-suppress MixedOperand
+     */
+    public static function finish(SplFixedArray $ctx, SplFixedArray $out)
+    {
+        self::pseudoConstructor();
+        if ($ctx[4] > 128) {
+            self::increment_counter($ctx, 128);
+            self::compress($ctx, $ctx[3]);
+            $ctx[4] -= 128;
+            if ($ctx[4] > 128) {
+                throw new SodiumException('Failed to assert that buflen <= 128 bytes');
+            }
+            for ($i = $ctx[4]; $i--;) {
+                $ctx[3][$i] = $ctx[3][$i + 128];
+            }
+        }
+
+        self::increment_counter($ctx, $ctx[4]);
+        $ctx[2][0] = self::new64(0xffffffff, 0xffffffff);
+
+        for ($i = 256 - $ctx[4]; $i--;) {
+            $ctx[3][$i+$ctx[4]] = 0;
+        }
+
+        self::compress($ctx, $ctx[3]);
+
+        $i = (int) (($out->getSize() - 1) / 8);
+        for (; $i >= 0; --$i) {
+            self::store64($out, $i << 3, $ctx[0][$i]);
+        }
+        return $out;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param SplFixedArray|null $key
+     * @param int $outlen
+     * @param SplFixedArray|null $salt
+     * @param SplFixedArray|null $personal
+     * @return SplFixedArray
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     * @psalm-suppress MixedAssignment
+     * @psalm-suppress MixedArrayAccess
+     * @psalm-suppress MixedArrayAssignment
+     * @psalm-suppress MixedArrayOffset
+     */
+    public static function init(
+        $key = null,
+        $outlen = 64,
+        $salt = null,
+        $personal = null
+    ) {
+        self::pseudoConstructor();
+        $klen = 0;
+
+        if ($key !== null) {
+            if (count($key) > 64) {
+                throw new SodiumException('Invalid key size');
+            }
+            $klen = count($key);
+        }
+
+        if ($outlen > 64) {
+            throw new SodiumException('Invalid output size');
+        }
+
+        $ctx = self::context();
+
+        $p = new SplFixedArray(64);
+        // Zero our param buffer...
+        for ($i = 64; --$i;) {
+            $p[$i] = 0;
+        }
+
+        $p[0] = $outlen; // digest_length
+        $p[1] = $klen;   // key_length
+        $p[2] = 1;       // fanout
+        $p[3] = 1;       // depth
+
+        if ($salt instanceof SplFixedArray) {
+            // salt: [32] through [47]
+            for ($i = 0; $i < 16; ++$i) {
+                $p[32 + $i] = (int) $salt[$i];
+            }
+        }
+        if ($personal instanceof SplFixedArray) {
+            // personal: [48] through [63]
+            for ($i = 0; $i < 16; ++$i) {
+                $p[48 + $i] = (int) $personal[$i];
+            }
+        }
+
+        $ctx[0][0] = self::xor64(
+            $ctx[0][0],
+            self::load64($p, 0)
+        );
+        if ($salt instanceof SplFixedArray || $personal instanceof SplFixedArray) {
+            // We need to do what blake2b_init_param() does:
+            for ($i = 1; $i < 8; ++$i) {
+                $ctx[0][$i] = self::xor64(
+                    $ctx[0][$i],
+                    self::load64($p, $i << 3)
+                );
+            }
+        }
+
+        if ($klen > 0 && $key instanceof SplFixedArray) {
+            $block = new SplFixedArray(128);
+            for ($i = 128; $i--;) {
+                $block[$i] = 0;
+            }
+            for ($i = $klen; $i--;) {
+                $block[$i] = $key[$i];
+            }
+            self::update($ctx, $block, 128);
+            $ctx[4] = 128;
+        }
+
+        return $ctx;
+    }
+
+    /**
+     * Convert a string into an SplFixedArray of integers
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $str
+     * @return SplFixedArray
+     * @psalm-suppress MixedArgumentTypeCoercion
+     */
+    public static function stringToSplFixedArray($str = '')
+    {
+        $values = unpack('C*', $str);
+        return SplFixedArray::fromArray(array_values($values));
+    }
+
+    /**
+     * Convert an SplFixedArray of integers into a string
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param SplFixedArray $a
+     * @return string
+     * @throws TypeError
+     */
+    public static function SplFixedArrayToString(SplFixedArray $a)
+    {
+        /**
+         * @var array<int, int|string> $arr
+         */
+        $arr = $a->toArray();
+        $c = $a->count();
+        array_unshift($arr, str_repeat('C', $c));
+        return (string) (call_user_func_array('pack', $arr));
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param SplFixedArray $ctx
+     * @return string
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     * @psalm-suppress MixedAssignment
+     * @psalm-suppress MixedArrayAccess
+     * @psalm-suppress MixedArrayAssignment
+     * @psalm-suppress MixedArrayOffset
+     * @psalm-suppress MixedMethodCall
+     */
+    public static function contextToString(SplFixedArray $ctx)
+    {
+        $str = '';
+        /** @var array<int, array<int, int>> $ctxA */
+        $ctxA = $ctx[0]->toArray();
+
+        # uint64_t h[8];
+        for ($i = 0; $i < 8; ++$i) {
+            $str .= self::store32_le($ctxA[$i][1]);
+            $str .= self::store32_le($ctxA[$i][0]);
+        }
+
+        # uint64_t t[2];
+        # uint64_t f[2];
+        for ($i = 1; $i < 3; ++$i) {
+            $ctxA = $ctx[$i]->toArray();
+            $str .= self::store32_le($ctxA[0][1]);
+            $str .= self::store32_le($ctxA[0][0]);
+            $str .= self::store32_le($ctxA[1][1]);
+            $str .= self::store32_le($ctxA[1][0]);
+        }
+
+        # uint8_t buf[2 * 128];
+        $str .= self::SplFixedArrayToString($ctx[3]);
+
+        /** @var int $ctx4 */
+        $ctx4 = (int) $ctx[4];
+
+        # size_t buflen;
+        $str .= implode('', array(
+            self::intToChr($ctx4 & 0xff),
+            self::intToChr(($ctx4 >> 8) & 0xff),
+            self::intToChr(($ctx4 >> 16) & 0xff),
+            self::intToChr(($ctx4 >> 24) & 0xff),
+            self::intToChr(($ctx4 >> 32) & 0xff),
+            self::intToChr(($ctx4 >> 40) & 0xff),
+            self::intToChr(($ctx4 >> 48) & 0xff),
+            self::intToChr(($ctx4 >> 56) & 0xff)
+        ));
+        # uint8_t last_node;
+        return $str . self::intToChr($ctx[5]) . str_repeat("\x00", 23);
+    }
+
+    /**
+     * Creates an SplFixedArray containing other SplFixedArray elements, from
+     * a string (compatible with \Sodium\crypto_generichash_{init, update, final})
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $string
+     * @return SplFixedArray
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArrayAssignment
+     */
+    public static function stringToContext($string)
+    {
+        $ctx = self::context();
+
+        # uint64_t h[8];
+        for ($i = 0; $i < 8; ++$i) {
+            $ctx[0][$i] = SplFixedArray::fromArray(
+                array(
+                    self::load_4(
+                        self::substr($string, (($i << 3) + 4), 4)
+                    ),
+                    self::load_4(
+                        self::substr($string, (($i << 3) + 0), 4)
+                    )
+                )
+            );
+        }
+
+        # uint64_t t[2];
+        # uint64_t f[2];
+        for ($i = 1; $i < 3; ++$i) {
+            $ctx[$i][1] = SplFixedArray::fromArray(
+                array(
+                    self::load_4(self::substr($string, 76 + (($i - 1) << 4), 4)),
+                    self::load_4(self::substr($string, 72 + (($i - 1) << 4), 4))
+                )
+            );
+            $ctx[$i][0] = SplFixedArray::fromArray(
+                array(
+                    self::load_4(self::substr($string, 68 + (($i - 1) << 4), 4)),
+                    self::load_4(self::substr($string, 64 + (($i - 1) << 4), 4))
+                )
+            );
+        }
+
+        # uint8_t buf[2 * 128];
+        $ctx[3] = self::stringToSplFixedArray(self::substr($string, 96, 256));
+
+        # uint8_t buf[2 * 128];
+        $int = 0;
+        for ($i = 0; $i < 8; ++$i) {
+            $int |= self::chrToInt($string[352 + $i]) << ($i << 3);
+        }
+        $ctx[4] = $int;
+
+        return $ctx;
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core/Base64/Common.php b/vendor/paragonie/sodium_compat/src/Core/Base64/Common.php
new file mode 100644
index 0000000..94b2e8f
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core/Base64/Common.php
@@ -0,0 +1,213 @@
+<?php
+
+/**
+ * Class ParagonIE_Sodium_Core_Base64
+ *
+ *  Copyright (c) 2016 - 2018 Paragon Initiative Enterprises.
+ *  Copyright (c) 2014 Steve "Sc00bz" Thomas (steve at tobtu dot com)
+ *
+ * We have to copy/paste the contents into the variant files because PHP 5.2
+ * doesn't support late static binding, and we have no better workaround
+ * available that won't break PHP 7+. Therefore, we're forced to duplicate code.
+ */
+abstract class ParagonIE_Sodium_Core_Base64_Common
+{
+    /**
+     * Encode into Base64
+     *
+     * Base64 character set "[A-Z][a-z][0-9]+/"
+     *
+     * @param string $src
+     * @return string
+     * @throws TypeError
+     */
+    public static function encode($src)
+    {
+        return self::doEncode($src, true);
+    }
+
+    /**
+     * Encode into Base64, no = padding
+     *
+     * Base64 character set "[A-Z][a-z][0-9]+/"
+     *
+     * @param string $src
+     * @return string
+     * @throws TypeError
+     */
+    public static function encodeUnpadded($src)
+    {
+        return self::doEncode($src, false);
+    }
+
+    /**
+     * @param string $src
+     * @param bool $pad   Include = padding?
+     * @return string
+     * @throws TypeError
+     */
+    protected static function doEncode($src, $pad = true)
+    {
+        $dest = '';
+        $srcLen = ParagonIE_Sodium_Core_Util::strlen($src);
+        // Main loop (no padding):
+        for ($i = 0; $i + 3 <= $srcLen; $i += 3) {
+            /** @var array<int, int> $chunk */
+            $chunk = unpack('C*', ParagonIE_Sodium_Core_Util::substr($src, $i, 3));
+            $b0 = $chunk[1];
+            $b1 = $chunk[2];
+            $b2 = $chunk[3];
+
+            $dest .=
+                self::encode6Bits(               $b0 >> 2       ) .
+                self::encode6Bits((($b0 << 4) | ($b1 >> 4)) & 63) .
+                self::encode6Bits((($b1 << 2) | ($b2 >> 6)) & 63) .
+                self::encode6Bits(  $b2                     & 63);
+        }
+        // The last chunk, which may have padding:
+        if ($i < $srcLen) {
+            /** @var array<int, int> $chunk */
+            $chunk = unpack('C*', ParagonIE_Sodium_Core_Util::substr($src, $i, $srcLen - $i));
+            $b0 = $chunk[1];
+            if ($i + 1 < $srcLen) {
+                $b1 = $chunk[2];
+                $dest .=
+                    self::encode6Bits($b0 >> 2) .
+                    self::encode6Bits((($b0 << 4) | ($b1 >> 4)) & 63) .
+                    self::encode6Bits(($b1 << 2) & 63);
+                if ($pad) {
+                    $dest .= '=';
+                }
+            } else {
+                $dest .=
+                    self::encode6Bits( $b0 >> 2) .
+                    self::encode6Bits(($b0 << 4) & 63);
+                if ($pad) {
+                    $dest .= '==';
+                }
+            }
+        }
+        return $dest;
+    }
+
+    /**
+     * decode from base64 into binary
+     *
+     * Base64 character set "./[A-Z][a-z][0-9]"
+     *
+     * @param string $src
+     * @param bool $strictPadding
+     * @return string
+     * @throws RangeException
+     * @throws TypeError
+     * @psalm-suppress RedundantCondition
+     */
+    public static function decode($src, $strictPadding = false)
+    {
+        // Remove padding
+        $srcLen = ParagonIE_Sodium_Core_Util::strlen($src);
+        if ($srcLen === 0) {
+            return '';
+        }
+
+        if ($strictPadding) {
+            if (($srcLen & 3) === 0) {
+                if ($src[$srcLen - 1] === '=') {
+                    $srcLen--;
+                    if ($src[$srcLen - 1] === '=') {
+                        $srcLen--;
+                    }
+                }
+            }
+            if (($srcLen & 3) === 1) {
+                throw new RangeException(
+                    'Incorrect padding'
+                );
+            }
+            if ($src[$srcLen - 1] === '=') {
+                throw new RangeException(
+                    'Incorrect padding'
+                );
+            }
+        } else {
+            $src = rtrim($src, '=');
+            $srcLen = ParagonIE_Sodium_Core_Util::strlen($src);
+        }
+
+        $err = 0;
+        $dest = '';
+        // Main loop (no padding):
+        for ($i = 0; $i + 4 <= $srcLen; $i += 4) {
+            /** @var array<int, int> $chunk */
+            $chunk = unpack('C*', ParagonIE_Sodium_Core_Util::substr($src, $i, 4));
+            $c0 = self::decode6Bits($chunk[1]);
+            $c1 = self::decode6Bits($chunk[2]);
+            $c2 = self::decode6Bits($chunk[3]);
+            $c3 = self::decode6Bits($chunk[4]);
+
+            $dest .= pack(
+                'CCC',
+                ((($c0 << 2) | ($c1 >> 4)) & 0xff),
+                ((($c1 << 4) | ($c2 >> 2)) & 0xff),
+                ((($c2 << 6) |  $c3      ) & 0xff)
+            );
+            $err |= ($c0 | $c1 | $c2 | $c3) >> 8;
+        }
+        // The last chunk, which may have padding:
+        if ($i < $srcLen) {
+            /** @var array<int, int> $chunk */
+            $chunk = unpack('C*', ParagonIE_Sodium_Core_Util::substr($src, $i, $srcLen - $i));
+            $c0 = self::decode6Bits($chunk[1]);
+
+            if ($i + 2 < $srcLen) {
+                $c1 = self::decode6Bits($chunk[2]);
+                $c2 = self::decode6Bits($chunk[3]);
+                $dest .= pack(
+                    'CC',
+                    ((($c0 << 2) | ($c1 >> 4)) & 0xff),
+                    ((($c1 << 4) | ($c2 >> 2)) & 0xff)
+                );
+                $err |= ($c0 | $c1 | $c2) >> 8;
+            } elseif ($i + 1 < $srcLen) {
+                $c1 = self::decode6Bits($chunk[2]);
+                $dest .= pack(
+                    'C',
+                    ((($c0 << 2) | ($c1 >> 4)) & 0xff)
+                );
+                $err |= ($c0 | $c1) >> 8;
+            } elseif ($i < $srcLen && $strictPadding) {
+                $err |= 1;
+            }
+        }
+        /** @var bool $check */
+        $check = ($err === 0);
+        if (!$check) {
+            throw new RangeException(
+                'Base64::decode() only expects characters in the correct base64 alphabet'
+            );
+        }
+        return $dest;
+    }
+
+    /**
+     * Uses bitwise operators instead of table-lookups to turn 6-bit integers
+     * into 8-bit integers.
+     *
+     * Base64 character set:
+     * [A-Z]      [a-z]      [0-9]      +     /
+     * 0x41-0x5a, 0x61-0x7a, 0x30-0x39, 0x2b, 0x2f
+     *
+     * @param int $src
+     * @return int
+     */
+    abstract protected static function decode6Bits($src);
+
+    /**
+     * Uses bitwise operators instead of table-lookups to turn 8-bit integers
+     * into 6-bit integers.
+     *
+     * @param int $src
+     * @return string
+     */
+    abstract protected static function encode6Bits($src);
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core/Base64/Original.php b/vendor/paragonie/sodium_compat/src/Core/Base64/Original.php
new file mode 100644
index 0000000..dc939ee
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core/Base64/Original.php
@@ -0,0 +1,248 @@
+<?php
+
+/**
+ * Class ParagonIE_Sodium_Core_Base64
+ *
+ *  Copyright (c) 2016 - 2018 Paragon Initiative Enterprises.
+ *  Copyright (c) 2014 Steve "Sc00bz" Thomas (steve at tobtu dot com)
+ */
+class ParagonIE_Sodium_Core_Base64_Original
+{
+    // COPY ParagonIE_Sodium_Core_Base64_Common STARTING HERE
+    /**
+     * Encode into Base64
+     *
+     * Base64 character set "[A-Z][a-z][0-9]+/"
+     *
+     * @param string $src
+     * @return string
+     * @throws TypeError
+     */
+    public static function encode($src)
+    {
+        return self::doEncode($src, true);
+    }
+
+    /**
+     * Encode into Base64, no = padding
+     *
+     * Base64 character set "[A-Z][a-z][0-9]+/"
+     *
+     * @param string $src
+     * @return string
+     * @throws TypeError
+     */
+    public static function encodeUnpadded($src)
+    {
+        return self::doEncode($src, false);
+    }
+
+    /**
+     * @param string $src
+     * @param bool $pad   Include = padding?
+     * @return string
+     * @throws TypeError
+     */
+    protected static function doEncode($src, $pad = true)
+    {
+        $dest = '';
+        $srcLen = ParagonIE_Sodium_Core_Util::strlen($src);
+        // Main loop (no padding):
+        for ($i = 0; $i + 3 <= $srcLen; $i += 3) {
+            /** @var array<int, int> $chunk */
+            $chunk = unpack('C*', ParagonIE_Sodium_Core_Util::substr($src, $i, 3));
+            $b0 = $chunk[1];
+            $b1 = $chunk[2];
+            $b2 = $chunk[3];
+
+            $dest .=
+                self::encode6Bits(               $b0 >> 2       ) .
+                self::encode6Bits((($b0 << 4) | ($b1 >> 4)) & 63) .
+                self::encode6Bits((($b1 << 2) | ($b2 >> 6)) & 63) .
+                self::encode6Bits(  $b2                     & 63);
+        }
+        // The last chunk, which may have padding:
+        if ($i < $srcLen) {
+            /** @var array<int, int> $chunk */
+            $chunk = unpack('C*', ParagonIE_Sodium_Core_Util::substr($src, $i, $srcLen - $i));
+            $b0 = $chunk[1];
+            if ($i + 1 < $srcLen) {
+                $b1 = $chunk[2];
+                $dest .=
+                    self::encode6Bits($b0 >> 2) .
+                    self::encode6Bits((($b0 << 4) | ($b1 >> 4)) & 63) .
+                    self::encode6Bits(($b1 << 2) & 63);
+                if ($pad) {
+                    $dest .= '=';
+                }
+            } else {
+                $dest .=
+                    self::encode6Bits( $b0 >> 2) .
+                    self::encode6Bits(($b0 << 4) & 63);
+                if ($pad) {
+                    $dest .= '==';
+                }
+            }
+        }
+        return $dest;
+    }
+
+    /**
+     * decode from base64 into binary
+     *
+     * Base64 character set "./[A-Z][a-z][0-9]"
+     *
+     * @param string $src
+     * @param bool $strictPadding
+     * @return string
+     * @throws RangeException
+     * @throws TypeError
+     * @psalm-suppress RedundantCondition
+     */
+    public static function decode($src, $strictPadding = false)
+    {
+        // Remove padding
+        $srcLen = ParagonIE_Sodium_Core_Util::strlen($src);
+        if ($srcLen === 0) {
+            return '';
+        }
+
+        if ($strictPadding) {
+            if (($srcLen & 3) === 0) {
+                if ($src[$srcLen - 1] === '=') {
+                    $srcLen--;
+                    if ($src[$srcLen - 1] === '=') {
+                        $srcLen--;
+                    }
+                }
+            }
+            if (($srcLen & 3) === 1) {
+                throw new RangeException(
+                    'Incorrect padding'
+                );
+            }
+            if ($src[$srcLen - 1] === '=') {
+                throw new RangeException(
+                    'Incorrect padding'
+                );
+            }
+        } else {
+            $src = rtrim($src, '=');
+            $srcLen =  ParagonIE_Sodium_Core_Util::strlen($src);
+        }
+
+        $err = 0;
+        $dest = '';
+        // Main loop (no padding):
+        for ($i = 0; $i + 4 <= $srcLen; $i += 4) {
+            /** @var array<int, int> $chunk */
+            $chunk = unpack('C*', ParagonIE_Sodium_Core_Util::substr($src, $i, 4));
+            $c0 = self::decode6Bits($chunk[1]);
+            $c1 = self::decode6Bits($chunk[2]);
+            $c2 = self::decode6Bits($chunk[3]);
+            $c3 = self::decode6Bits($chunk[4]);
+
+            $dest .= pack(
+                'CCC',
+                ((($c0 << 2) | ($c1 >> 4)) & 0xff),
+                ((($c1 << 4) | ($c2 >> 2)) & 0xff),
+                ((($c2 << 6) | $c3) & 0xff)
+            );
+            $err |= ($c0 | $c1 | $c2 | $c3) >> 8;
+        }
+        // The last chunk, which may have padding:
+        if ($i < $srcLen) {
+            /** @var array<int, int> $chunk */
+            $chunk = unpack('C*', ParagonIE_Sodium_Core_Util::substr($src, $i, $srcLen - $i));
+            $c0 = self::decode6Bits($chunk[1]);
+
+            if ($i + 2 < $srcLen) {
+                $c1 = self::decode6Bits($chunk[2]);
+                $c2 = self::decode6Bits($chunk[3]);
+                $dest .= pack(
+                    'CC',
+                    ((($c0 << 2) | ($c1 >> 4)) & 0xff),
+                    ((($c1 << 4) | ($c2 >> 2)) & 0xff)
+                );
+                $err |= ($c0 | $c1 | $c2) >> 8;
+            } elseif ($i + 1 < $srcLen) {
+                $c1 = self::decode6Bits($chunk[2]);
+                $dest .= pack(
+                    'C',
+                    ((($c0 << 2) | ($c1 >> 4)) & 0xff)
+                );
+                $err |= ($c0 | $c1) >> 8;
+            } elseif ($i < $srcLen && $strictPadding) {
+                $err |= 1;
+            }
+        }
+        /** @var bool $check */
+        $check = ($err === 0);
+        if (!$check) {
+            throw new RangeException(
+                'Base64::decode() only expects characters in the correct base64 alphabet'
+            );
+        }
+        return $dest;
+    }
+    // COPY ParagonIE_Sodium_Core_Base64_Common ENDING HERE
+
+    /**
+     * Uses bitwise operators instead of table-lookups to turn 6-bit integers
+     * into 8-bit integers.
+     *
+     * Base64 character set:
+     * [A-Z]      [a-z]      [0-9]      +     /
+     * 0x41-0x5a, 0x61-0x7a, 0x30-0x39, 0x2b, 0x2f
+     *
+     * @param int $src
+     * @return int
+     */
+    protected static function decode6Bits($src)
+    {
+        $ret = -1;
+
+        // if ($src > 0x40 && $src < 0x5b) $ret += $src - 0x41 + 1; // -64
+        $ret += (((0x40 - $src) & ($src - 0x5b)) >> 8) & ($src - 64);
+
+        // if ($src > 0x60 && $src < 0x7b) $ret += $src - 0x61 + 26 + 1; // -70
+        $ret += (((0x60 - $src) & ($src - 0x7b)) >> 8) & ($src - 70);
+
+        // if ($src > 0x2f && $src < 0x3a) $ret += $src - 0x30 + 52 + 1; // 5
+        $ret += (((0x2f - $src) & ($src - 0x3a)) >> 8) & ($src + 5);
+
+        // if ($src == 0x2b) $ret += 62 + 1;
+        $ret += (((0x2a - $src) & ($src - 0x2c)) >> 8) & 63;
+
+        // if ($src == 0x2f) ret += 63 + 1;
+        $ret += (((0x2e - $src) & ($src - 0x30)) >> 8) & 64;
+
+        return $ret;
+    }
+
+    /**
+     * Uses bitwise operators instead of table-lookups to turn 8-bit integers
+     * into 6-bit integers.
+     *
+     * @param int $src
+     * @return string
+     */
+    protected static function encode6Bits($src)
+    {
+        $diff = 0x41;
+
+        // if ($src > 25) $diff += 0x61 - 0x41 - 26; // 6
+        $diff += ((25 - $src) >> 8) & 6;
+
+        // if ($src > 51) $diff += 0x30 - 0x61 - 26; // -75
+        $diff -= ((51 - $src) >> 8) & 75;
+
+        // if ($src > 61) $diff += 0x2b - 0x30 - 10; // -15
+        $diff -= ((61 - $src) >> 8) & 15;
+
+        // if ($src > 62) $diff += 0x2f - 0x2b - 1; // 3
+        $diff += ((62 - $src) >> 8) & 3;
+
+        return pack('C', $src + $diff);
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core/Base64/UrlSafe.php b/vendor/paragonie/sodium_compat/src/Core/Base64/UrlSafe.php
new file mode 100644
index 0000000..64bf53b
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core/Base64/UrlSafe.php
@@ -0,0 +1,247 @@
+<?php
+
+/**
+ * Class ParagonIE_Sodium_Core_Base64UrlSafe
+ *
+ *  Copyright (c) 2016 - 2018 Paragon Initiative Enterprises.
+ *  Copyright (c) 2014 Steve "Sc00bz" Thomas (steve at tobtu dot com)
+ */
+class ParagonIE_Sodium_Core_Base64_UrlSafe
+{
+    // COPY ParagonIE_Sodium_Core_Base64_Common STARTING HERE
+    /**
+     * Encode into Base64
+     *
+     * Base64 character set "[A-Z][a-z][0-9]+/"
+     *
+     * @param string $src
+     * @return string
+     * @throws TypeError
+     */
+    public static function encode($src)
+    {
+        return self::doEncode($src, true);
+    }
+
+    /**
+     * Encode into Base64, no = padding
+     *
+     * Base64 character set "[A-Z][a-z][0-9]+/"
+     *
+     * @param string $src
+     * @return string
+     * @throws TypeError
+     */
+    public static function encodeUnpadded($src)
+    {
+        return self::doEncode($src, false);
+    }
+
+    /**
+     * @param string $src
+     * @param bool $pad   Include = padding?
+     * @return string
+     * @throws TypeError
+     */
+    protected static function doEncode($src, $pad = true)
+    {
+        $dest = '';
+        $srcLen = ParagonIE_Sodium_Core_Util::strlen($src);
+        // Main loop (no padding):
+        for ($i = 0; $i + 3 <= $srcLen; $i += 3) {
+            /** @var array<int, int> $chunk */
+            $chunk = unpack('C*', ParagonIE_Sodium_Core_Util::substr($src, $i, 3));
+            $b0 = $chunk[1];
+            $b1 = $chunk[2];
+            $b2 = $chunk[3];
+
+            $dest .=
+                self::encode6Bits(               $b0 >> 2       ) .
+                self::encode6Bits((($b0 << 4) | ($b1 >> 4)) & 63) .
+                self::encode6Bits((($b1 << 2) | ($b2 >> 6)) & 63) .
+                self::encode6Bits(  $b2                     & 63);
+        }
+        // The last chunk, which may have padding:
+        if ($i < $srcLen) {
+            /** @var array<int, int> $chunk */
+            $chunk = unpack('C*', ParagonIE_Sodium_Core_Util::substr($src, $i, $srcLen - $i));
+            $b0 = $chunk[1];
+            if ($i + 1 < $srcLen) {
+                $b1 = $chunk[2];
+                $dest .=
+                    self::encode6Bits($b0 >> 2) .
+                    self::encode6Bits((($b0 << 4) | ($b1 >> 4)) & 63) .
+                    self::encode6Bits(($b1 << 2) & 63);
+                if ($pad) {
+                    $dest .= '=';
+                }
+            } else {
+                $dest .=
+                    self::encode6Bits( $b0 >> 2) .
+                    self::encode6Bits(($b0 << 4) & 63);
+                if ($pad) {
+                    $dest .= '==';
+                }
+            }
+        }
+        return $dest;
+    }
+
+    /**
+     * decode from base64 into binary
+     *
+     * Base64 character set "./[A-Z][a-z][0-9]"
+     *
+     * @param string $src
+     * @param bool $strictPadding
+     * @return string
+     * @throws RangeException
+     * @throws TypeError
+     * @psalm-suppress RedundantCondition
+     */
+    public static function decode($src, $strictPadding = false)
+    {
+        // Remove padding
+        $srcLen = ParagonIE_Sodium_Core_Util::strlen($src);
+        if ($srcLen === 0) {
+            return '';
+        }
+
+        if ($strictPadding) {
+            if (($srcLen & 3) === 0) {
+                if ($src[$srcLen - 1] === '=') {
+                    $srcLen--;
+                    if ($src[$srcLen - 1] === '=') {
+                        $srcLen--;
+                    }
+                }
+            }
+            if (($srcLen & 3) === 1) {
+                throw new RangeException(
+                    'Incorrect padding'
+                );
+            }
+            if ($src[$srcLen - 1] === '=') {
+                throw new RangeException(
+                    'Incorrect padding'
+                );
+            }
+        } else {
+            $src = rtrim($src, '=');
+            $srcLen =  ParagonIE_Sodium_Core_Util::strlen($src);
+        }
+
+        $err = 0;
+        $dest = '';
+        // Main loop (no padding):
+        for ($i = 0; $i + 4 <= $srcLen; $i += 4) {
+            /** @var array<int, int> $chunk */
+            $chunk = unpack('C*', ParagonIE_Sodium_Core_Util::substr($src, $i, 4));
+            $c0 = self::decode6Bits($chunk[1]);
+            $c1 = self::decode6Bits($chunk[2]);
+            $c2 = self::decode6Bits($chunk[3]);
+            $c3 = self::decode6Bits($chunk[4]);
+
+            $dest .= pack(
+                'CCC',
+                ((($c0 << 2) | ($c1 >> 4)) & 0xff),
+                ((($c1 << 4) | ($c2 >> 2)) & 0xff),
+                ((($c2 << 6) | $c3) & 0xff)
+            );
+            $err |= ($c0 | $c1 | $c2 | $c3) >> 8;
+        }
+        // The last chunk, which may have padding:
+        if ($i < $srcLen) {
+            /** @var array<int, int> $chunk */
+            $chunk = unpack('C*', ParagonIE_Sodium_Core_Util::substr($src, $i, $srcLen - $i));
+            $c0 = self::decode6Bits($chunk[1]);
+
+            if ($i + 2 < $srcLen) {
+                $c1 = self::decode6Bits($chunk[2]);
+                $c2 = self::decode6Bits($chunk[3]);
+                $dest .= pack(
+                    'CC',
+                    ((($c0 << 2) | ($c1 >> 4)) & 0xff),
+                    ((($c1 << 4) | ($c2 >> 2)) & 0xff)
+                );
+                $err |= ($c0 | $c1 | $c2) >> 8;
+            } elseif ($i + 1 < $srcLen) {
+                $c1 = self::decode6Bits($chunk[2]);
+                $dest .= pack(
+                    'C',
+                    ((($c0 << 2) | ($c1 >> 4)) & 0xff)
+                );
+                $err |= ($c0 | $c1) >> 8;
+            } elseif ($i < $srcLen && $strictPadding) {
+                $err |= 1;
+            }
+        }
+        /** @var bool $check */
+        $check = ($err === 0);
+        if (!$check) {
+            throw new RangeException(
+                'Base64::decode() only expects characters in the correct base64 alphabet'
+            );
+        }
+        return $dest;
+    }
+    // COPY ParagonIE_Sodium_Core_Base64_Common ENDING HERE
+    /**
+     * Uses bitwise operators instead of table-lookups to turn 6-bit integers
+     * into 8-bit integers.
+     *
+     * Base64 character set:
+     * [A-Z]      [a-z]      [0-9]      +     /
+     * 0x41-0x5a, 0x61-0x7a, 0x30-0x39, 0x2b, 0x2f
+     *
+     * @param int $src
+     * @return int
+     */
+    protected static function decode6Bits($src)
+    {
+        $ret = -1;
+
+        // if ($src > 0x40 && $src < 0x5b) $ret += $src - 0x41 + 1; // -64
+        $ret += (((0x40 - $src) & ($src - 0x5b)) >> 8) & ($src - 64);
+
+        // if ($src > 0x60 && $src < 0x7b) $ret += $src - 0x61 + 26 + 1; // -70
+        $ret += (((0x60 - $src) & ($src - 0x7b)) >> 8) & ($src - 70);
+
+        // if ($src > 0x2f && $src < 0x3a) $ret += $src - 0x30 + 52 + 1; // 5
+        $ret += (((0x2f - $src) & ($src - 0x3a)) >> 8) & ($src + 5);
+
+        // if ($src == 0x2c) $ret += 62 + 1;
+        $ret += (((0x2c - $src) & ($src - 0x2e)) >> 8) & 63;
+
+        // if ($src == 0x5f) ret += 63 + 1;
+        $ret += (((0x5e - $src) & ($src - 0x60)) >> 8) & 64;
+
+        return $ret;
+    }
+
+    /**
+     * Uses bitwise operators instead of table-lookups to turn 8-bit integers
+     * into 6-bit integers.
+     *
+     * @param int $src
+     * @return string
+     */
+    protected static function encode6Bits($src)
+    {
+        $diff = 0x41;
+
+        // if ($src > 25) $diff += 0x61 - 0x41 - 26; // 6
+        $diff += ((25 - $src) >> 8) & 6;
+
+        // if ($src > 51) $diff += 0x30 - 0x61 - 26; // -75
+        $diff -= ((51 - $src) >> 8) & 75;
+
+        // if ($src > 61) $diff += 0x2d - 0x30 - 10; // -13
+        $diff -= ((61 - $src) >> 8) & 13;
+
+        // if ($src > 62) $diff += 0x5f - 0x2b - 1; // 3
+        $diff += ((62 - $src) >> 8) & 49;
+
+        return pack('C', $src + $diff);
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core/ChaCha20.php b/vendor/paragonie/sodium_compat/src/Core/ChaCha20.php
new file mode 100644
index 0000000..806010c
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core/ChaCha20.php
@@ -0,0 +1,395 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core_ChaCha20', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core_ChaCha20
+ */
+class ParagonIE_Sodium_Core_ChaCha20 extends ParagonIE_Sodium_Core_Util
+{
+    /**
+     * Bitwise left rotation
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param int $v
+     * @param int $n
+     * @return int
+     */
+    public static function rotate($v, $n)
+    {
+        $v &= 0xffffffff;
+        $n &= 31;
+        return (int) (
+            0xffffffff & (
+                ($v << $n)
+                    |
+                ($v >> (32 - $n))
+            )
+        );
+    }
+
+    /**
+     * The ChaCha20 quarter round function. Works on four 32-bit integers.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param int $a
+     * @param int $b
+     * @param int $c
+     * @param int $d
+     * @return array<int, int>
+     */
+    protected static function quarterRound($a, $b, $c, $d)
+    {
+        # a = PLUS(a,b); d = ROTATE(XOR(d,a),16);
+        /** @var int $a */
+        $a = ($a + $b) & 0xffffffff;
+        $d = self::rotate($d ^ $a, 16);
+
+        # c = PLUS(c,d); b = ROTATE(XOR(b,c),12);
+        /** @var int $c */
+        $c = ($c + $d) & 0xffffffff;
+        $b = self::rotate($b ^ $c, 12);
+
+        # a = PLUS(a,b); d = ROTATE(XOR(d,a), 8);
+        /** @var int $a */
+        $a = ($a + $b) & 0xffffffff;
+        $d = self::rotate($d ^ $a, 8);
+
+        # c = PLUS(c,d); b = ROTATE(XOR(b,c), 7);
+        /** @var int $c */
+        $c = ($c + $d) & 0xffffffff;
+        $b = self::rotate($b ^ $c, 7);
+        return array((int) $a, (int) $b, (int) $c, (int) $d);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_ChaCha20_Ctx $ctx
+     * @param string $message
+     *
+     * @return string
+     * @throws TypeError
+     * @throws SodiumException
+     */
+    public static function encryptBytes(
+        ParagonIE_Sodium_Core_ChaCha20_Ctx $ctx,
+        $message = ''
+    ) {
+        $bytes = self::strlen($message);
+
+        /*
+        j0 = ctx->input[0];
+        j1 = ctx->input[1];
+        j2 = ctx->input[2];
+        j3 = ctx->input[3];
+        j4 = ctx->input[4];
+        j5 = ctx->input[5];
+        j6 = ctx->input[6];
+        j7 = ctx->input[7];
+        j8 = ctx->input[8];
+        j9 = ctx->input[9];
+        j10 = ctx->input[10];
+        j11 = ctx->input[11];
+        j12 = ctx->input[12];
+        j13 = ctx->input[13];
+        j14 = ctx->input[14];
+        j15 = ctx->input[15];
+        */
+        $j0  = (int) $ctx[0];
+        $j1  = (int) $ctx[1];
+        $j2  = (int) $ctx[2];
+        $j3  = (int) $ctx[3];
+        $j4  = (int) $ctx[4];
+        $j5  = (int) $ctx[5];
+        $j6  = (int) $ctx[6];
+        $j7  = (int) $ctx[7];
+        $j8  = (int) $ctx[8];
+        $j9  = (int) $ctx[9];
+        $j10 = (int) $ctx[10];
+        $j11 = (int) $ctx[11];
+        $j12 = (int) $ctx[12];
+        $j13 = (int) $ctx[13];
+        $j14 = (int) $ctx[14];
+        $j15 = (int) $ctx[15];
+
+        $c = '';
+        for (;;) {
+            if ($bytes < 64) {
+                $message .= str_repeat("\x00", 64 - $bytes);
+            }
+
+            $x0 =  (int) $j0;
+            $x1 =  (int) $j1;
+            $x2 =  (int) $j2;
+            $x3 =  (int) $j3;
+            $x4 =  (int) $j4;
+            $x5 =  (int) $j5;
+            $x6 =  (int) $j6;
+            $x7 =  (int) $j7;
+            $x8 =  (int) $j8;
+            $x9 =  (int) $j9;
+            $x10 = (int) $j10;
+            $x11 = (int) $j11;
+            $x12 = (int) $j12;
+            $x13 = (int) $j13;
+            $x14 = (int) $j14;
+            $x15 = (int) $j15;
+
+            # for (i = 20; i > 0; i -= 2) {
+            for ($i = 20; $i > 0; $i -= 2) {
+                # QUARTERROUND( x0,  x4,  x8,  x12)
+                list($x0, $x4, $x8, $x12) = self::quarterRound($x0, $x4, $x8, $x12);
+
+                # QUARTERROUND( x1,  x5,  x9,  x13)
+                list($x1, $x5, $x9, $x13) = self::quarterRound($x1, $x5, $x9, $x13);
+
+                # QUARTERROUND( x2,  x6,  x10,  x14)
+                list($x2, $x6, $x10, $x14) = self::quarterRound($x2, $x6, $x10, $x14);
+
+                # QUARTERROUND( x3,  x7,  x11,  x15)
+                list($x3, $x7, $x11, $x15) = self::quarterRound($x3, $x7, $x11, $x15);
+
+                # QUARTERROUND( x0,  x5,  x10,  x15)
+                list($x0, $x5, $x10, $x15) = self::quarterRound($x0, $x5, $x10, $x15);
+
+                # QUARTERROUND( x1,  x6,  x11,  x12)
+                list($x1, $x6, $x11, $x12) = self::quarterRound($x1, $x6, $x11, $x12);
+
+                # QUARTERROUND( x2,  x7,  x8,  x13)
+                list($x2, $x7, $x8, $x13) = self::quarterRound($x2, $x7, $x8, $x13);
+
+                # QUARTERROUND( x3,  x4,  x9,  x14)
+                list($x3, $x4, $x9, $x14) = self::quarterRound($x3, $x4, $x9, $x14);
+            }
+            /*
+            x0 = PLUS(x0, j0);
+            x1 = PLUS(x1, j1);
+            x2 = PLUS(x2, j2);
+            x3 = PLUS(x3, j3);
+            x4 = PLUS(x4, j4);
+            x5 = PLUS(x5, j5);
+            x6 = PLUS(x6, j6);
+            x7 = PLUS(x7, j7);
+            x8 = PLUS(x8, j8);
+            x9 = PLUS(x9, j9);
+            x10 = PLUS(x10, j10);
+            x11 = PLUS(x11, j11);
+            x12 = PLUS(x12, j12);
+            x13 = PLUS(x13, j13);
+            x14 = PLUS(x14, j14);
+            x15 = PLUS(x15, j15);
+            */
+            /** @var int $x0 */
+            $x0  = ($x0 & 0xffffffff) + $j0;
+            /** @var int $x1 */
+            $x1  = ($x1 & 0xffffffff) + $j1;
+            /** @var int $x2 */
+            $x2  = ($x2 & 0xffffffff) + $j2;
+            /** @var int $x3 */
+            $x3  = ($x3 & 0xffffffff) + $j3;
+            /** @var int $x4 */
+            $x4  = ($x4 & 0xffffffff) + $j4;
+            /** @var int $x5 */
+            $x5  = ($x5 & 0xffffffff) + $j5;
+            /** @var int $x6 */
+            $x6  = ($x6 & 0xffffffff) + $j6;
+            /** @var int $x7 */
+            $x7  = ($x7 & 0xffffffff) + $j7;
+            /** @var int $x8 */
+            $x8  = ($x8 & 0xffffffff) + $j8;
+            /** @var int $x9 */
+            $x9  = ($x9 & 0xffffffff) + $j9;
+            /** @var int $x10 */
+            $x10 = ($x10 & 0xffffffff) + $j10;
+            /** @var int $x11 */
+            $x11 = ($x11 & 0xffffffff) + $j11;
+            /** @var int $x12 */
+            $x12 = ($x12 & 0xffffffff) + $j12;
+            /** @var int $x13 */
+            $x13 = ($x13 & 0xffffffff) + $j13;
+            /** @var int $x14 */
+            $x14 = ($x14 & 0xffffffff) + $j14;
+            /** @var int $x15 */
+            $x15 = ($x15 & 0xffffffff) + $j15;
+
+            /*
+            x0 = XOR(x0, LOAD32_LE(m + 0));
+            x1 = XOR(x1, LOAD32_LE(m + 4));
+            x2 = XOR(x2, LOAD32_LE(m + 8));
+            x3 = XOR(x3, LOAD32_LE(m + 12));
+            x4 = XOR(x4, LOAD32_LE(m + 16));
+            x5 = XOR(x5, LOAD32_LE(m + 20));
+            x6 = XOR(x6, LOAD32_LE(m + 24));
+            x7 = XOR(x7, LOAD32_LE(m + 28));
+            x8 = XOR(x8, LOAD32_LE(m + 32));
+            x9 = XOR(x9, LOAD32_LE(m + 36));
+            x10 = XOR(x10, LOAD32_LE(m + 40));
+            x11 = XOR(x11, LOAD32_LE(m + 44));
+            x12 = XOR(x12, LOAD32_LE(m + 48));
+            x13 = XOR(x13, LOAD32_LE(m + 52));
+            x14 = XOR(x14, LOAD32_LE(m + 56));
+            x15 = XOR(x15, LOAD32_LE(m + 60));
+            */
+            $x0  ^= self::load_4(self::substr($message, 0, 4));
+            $x1  ^= self::load_4(self::substr($message, 4, 4));
+            $x2  ^= self::load_4(self::substr($message, 8, 4));
+            $x3  ^= self::load_4(self::substr($message, 12, 4));
+            $x4  ^= self::load_4(self::substr($message, 16, 4));
+            $x5  ^= self::load_4(self::substr($message, 20, 4));
+            $x6  ^= self::load_4(self::substr($message, 24, 4));
+            $x7  ^= self::load_4(self::substr($message, 28, 4));
+            $x8  ^= self::load_4(self::substr($message, 32, 4));
+            $x9  ^= self::load_4(self::substr($message, 36, 4));
+            $x10 ^= self::load_4(self::substr($message, 40, 4));
+            $x11 ^= self::load_4(self::substr($message, 44, 4));
+            $x12 ^= self::load_4(self::substr($message, 48, 4));
+            $x13 ^= self::load_4(self::substr($message, 52, 4));
+            $x14 ^= self::load_4(self::substr($message, 56, 4));
+            $x15 ^= self::load_4(self::substr($message, 60, 4));
+
+            /*
+                j12 = PLUSONE(j12);
+                if (!j12) {
+                    j13 = PLUSONE(j13);
+                }
+             */
+            ++$j12;
+            if ($j12 & 0xf0000000) {
+                throw new SodiumException('Overflow');
+            }
+
+            /*
+            STORE32_LE(c + 0, x0);
+            STORE32_LE(c + 4, x1);
+            STORE32_LE(c + 8, x2);
+            STORE32_LE(c + 12, x3);
+            STORE32_LE(c + 16, x4);
+            STORE32_LE(c + 20, x5);
+            STORE32_LE(c + 24, x6);
+            STORE32_LE(c + 28, x7);
+            STORE32_LE(c + 32, x8);
+            STORE32_LE(c + 36, x9);
+            STORE32_LE(c + 40, x10);
+            STORE32_LE(c + 44, x11);
+            STORE32_LE(c + 48, x12);
+            STORE32_LE(c + 52, x13);
+            STORE32_LE(c + 56, x14);
+            STORE32_LE(c + 60, x15);
+            */
+            $block = self::store32_le((int) ($x0  & 0xffffffff)) .
+                 self::store32_le((int) ($x1  & 0xffffffff)) .
+                 self::store32_le((int) ($x2  & 0xffffffff)) .
+                 self::store32_le((int) ($x3  & 0xffffffff)) .
+                 self::store32_le((int) ($x4  & 0xffffffff)) .
+                 self::store32_le((int) ($x5  & 0xffffffff)) .
+                 self::store32_le((int) ($x6  & 0xffffffff)) .
+                 self::store32_le((int) ($x7  & 0xffffffff)) .
+                 self::store32_le((int) ($x8  & 0xffffffff)) .
+                 self::store32_le((int) ($x9  & 0xffffffff)) .
+                 self::store32_le((int) ($x10 & 0xffffffff)) .
+                 self::store32_le((int) ($x11 & 0xffffffff)) .
+                 self::store32_le((int) ($x12 & 0xffffffff)) .
+                 self::store32_le((int) ($x13 & 0xffffffff)) .
+                 self::store32_le((int) ($x14 & 0xffffffff)) .
+                 self::store32_le((int) ($x15 & 0xffffffff));
+
+            /* Partial block */
+            if ($bytes < 64) {
+                $c .= self::substr($block, 0, $bytes);
+                break;
+            }
+
+            /* Full block */
+            $c .= $block;
+            $bytes -= 64;
+            if ($bytes <= 0) {
+                break;
+            }
+            $message = self::substr($message, 64);
+        }
+        /* end for(;;) loop */
+
+        $ctx[12] = $j12;
+        $ctx[13] = $j13;
+        return $c;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param int $len
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function stream($len = 64, $nonce = '', $key = '')
+    {
+        return self::encryptBytes(
+            new ParagonIE_Sodium_Core_ChaCha20_Ctx($key, $nonce),
+            str_repeat("\x00", $len)
+        );
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param int $len
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function ietfStream($len, $nonce = '', $key = '')
+    {
+        return self::encryptBytes(
+            new ParagonIE_Sodium_Core_ChaCha20_IetfCtx($key, $nonce),
+            str_repeat("\x00", $len)
+        );
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $message
+     * @param string $nonce
+     * @param string $key
+     * @param string $ic
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function ietfStreamXorIc($message, $nonce = '', $key = '', $ic = '')
+    {
+        return self::encryptBytes(
+            new ParagonIE_Sodium_Core_ChaCha20_IetfCtx($key, $nonce, $ic),
+            $message
+        );
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $message
+     * @param string $nonce
+     * @param string $key
+     * @param string $ic
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function streamXorIc($message, $nonce = '', $key = '', $ic = '')
+    {
+        return self::encryptBytes(
+            new ParagonIE_Sodium_Core_ChaCha20_Ctx($key, $nonce, $ic),
+            $message
+        );
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core/ChaCha20/Ctx.php b/vendor/paragonie/sodium_compat/src/Core/ChaCha20/Ctx.php
new file mode 100644
index 0000000..47a42b7
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core/ChaCha20/Ctx.php
@@ -0,0 +1,119 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core_ChaCha20_Ctx', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core_ChaCha20_Ctx
+ */
+class ParagonIE_Sodium_Core_ChaCha20_Ctx extends ParagonIE_Sodium_Core_Util implements ArrayAccess
+{
+    /**
+     * @var SplFixedArray internally, <int, int>
+     */
+    protected $container;
+
+    /**
+     * ParagonIE_Sodium_Core_ChaCha20_Ctx constructor.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $key     ChaCha20 key.
+     * @param string $iv      Initialization Vector (a.k.a. nonce).
+     * @param string $counter The initial counter value.
+     *                        Defaults to 8 0x00 bytes.
+     * @throws InvalidArgumentException
+     * @throws TypeError
+     */
+    public function __construct($key = '', $iv = '', $counter = '')
+    {
+        if (self::strlen($key) !== 32) {
+            throw new InvalidArgumentException('ChaCha20 expects a 256-bit key.');
+        }
+        if (self::strlen($iv) !== 8) {
+            throw new InvalidArgumentException('ChaCha20 expects a 64-bit nonce.');
+        }
+        $this->container = new SplFixedArray(16);
+
+        /* "expand 32-byte k" as per ChaCha20 spec */
+        $this->container[0]  = 0x61707865;
+        $this->container[1]  = 0x3320646e;
+        $this->container[2]  = 0x79622d32;
+        $this->container[3]  = 0x6b206574;
+        $this->container[4]  = self::load_4(self::substr($key, 0, 4));
+        $this->container[5]  = self::load_4(self::substr($key, 4, 4));
+        $this->container[6]  = self::load_4(self::substr($key, 8, 4));
+        $this->container[7]  = self::load_4(self::substr($key, 12, 4));
+        $this->container[8]  = self::load_4(self::substr($key, 16, 4));
+        $this->container[9]  = self::load_4(self::substr($key, 20, 4));
+        $this->container[10] = self::load_4(self::substr($key, 24, 4));
+        $this->container[11] = self::load_4(self::substr($key, 28, 4));
+
+        if (empty($counter)) {
+            $this->container[12] = 0;
+            $this->container[13] = 0;
+        } else {
+            $this->container[12] = self::load_4(self::substr($counter, 0, 4));
+            $this->container[13] = self::load_4(self::substr($counter, 4, 4));
+        }
+        $this->container[14] = self::load_4(self::substr($iv, 0, 4));
+        $this->container[15] = self::load_4(self::substr($iv, 4, 4));
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param int $offset
+     * @param int $value
+     * @return void
+     * @psalm-suppress MixedArrayOffset
+     */
+    public function offsetSet($offset, $value)
+    {
+        if (!is_int($offset)) {
+            throw new InvalidArgumentException('Expected an integer');
+        }
+        if (!is_int($value)) {
+            throw new InvalidArgumentException('Expected an integer');
+        }
+        $this->container[$offset] = $value;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param int $offset
+     * @return bool
+     */
+    public function offsetExists($offset)
+    {
+        return isset($this->container[$offset]);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param int $offset
+     * @return void
+     * @psalm-suppress MixedArrayOffset
+     */
+    public function offsetUnset($offset)
+    {
+        unset($this->container[$offset]);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param int $offset
+     * @return mixed|null
+     * @psalm-suppress MixedArrayOffset
+     */
+    public function offsetGet($offset)
+    {
+        return isset($this->container[$offset])
+            ? $this->container[$offset]
+            : null;
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core/ChaCha20/IetfCtx.php b/vendor/paragonie/sodium_compat/src/Core/ChaCha20/IetfCtx.php
new file mode 100644
index 0000000..4d63b90
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core/ChaCha20/IetfCtx.php
@@ -0,0 +1,38 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core_ChaCha20_IetfCtx', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core_ChaCha20_IetfCtx
+ */
+class ParagonIE_Sodium_Core_ChaCha20_IetfCtx extends ParagonIE_Sodium_Core_ChaCha20_Ctx
+{
+    /**
+     * ParagonIE_Sodium_Core_ChaCha20_IetfCtx constructor.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $key     ChaCha20 key.
+     * @param string $iv      Initialization Vector (a.k.a. nonce).
+     * @param string $counter The initial counter value.
+     *                        Defaults to 4 0x00 bytes.
+     * @throws InvalidArgumentException
+     * @throws TypeError
+     */
+    public function __construct($key = '', $iv = '', $counter = '')
+    {
+        if (self::strlen($iv) !== 12) {
+            throw new InvalidArgumentException('ChaCha20 expects a 96-bit nonce in IETF mode.');
+        }
+        parent::__construct($key, self::substr($iv, 0, 8), $counter);
+
+        if (!empty($counter)) {
+            $this->container[12] = self::load_4(self::substr($counter, 0, 4));
+        }
+        $this->container[13] = self::load_4(self::substr($iv, 0, 4));
+        $this->container[14] = self::load_4(self::substr($iv, 4, 4));
+        $this->container[15] = self::load_4(self::substr($iv, 8, 4));
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core/Curve25519.php b/vendor/paragonie/sodium_compat/src/Core/Curve25519.php
new file mode 100644
index 0000000..f0b9c5f
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core/Curve25519.php
@@ -0,0 +1,4106 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core_Curve25519', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core_Curve25519
+ *
+ * Implements Curve25519 core functions
+ *
+ * Based on the ref10 curve25519 code provided by libsodium
+ *
+ * @ref https://github.com/jedisct1/libsodium/blob/master/src/libsodium/crypto_core/curve25519/ref10/curve25519_ref10.c
+ */
+abstract class ParagonIE_Sodium_Core_Curve25519 extends ParagonIE_Sodium_Core_Curve25519_H
+{
+    /**
+     * Get a field element of size 10 with a value of 0
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @return ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public static function fe_0()
+    {
+        return ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+            array(0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
+        );
+    }
+
+    /**
+     * Get a field element of size 10 with a value of 1
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @return ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public static function fe_1()
+    {
+        return ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+            array(1, 0, 0, 0, 0, 0, 0, 0, 0, 0)
+        );
+    }
+
+    /**
+     * Add two field elements.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $g
+     * @return ParagonIE_Sodium_Core_Curve25519_Fe
+     * @psalm-suppress MixedAssignment
+     * @psalm-suppress MixedOperand
+     */
+    public static function fe_add(
+        ParagonIE_Sodium_Core_Curve25519_Fe $f,
+        ParagonIE_Sodium_Core_Curve25519_Fe $g
+    ) {
+        /** @var array<int, int> $arr */
+        $arr = array();
+        for ($i = 0; $i < 10; ++$i) {
+            $arr[$i] = (int) ($f[$i] + $g[$i]);
+        }
+        return ParagonIE_Sodium_Core_Curve25519_Fe::fromArray($arr);
+    }
+
+    /**
+     * Constant-time conditional move.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $g
+     * @param int $b
+     * @return ParagonIE_Sodium_Core_Curve25519_Fe
+     * @psalm-suppress MixedAssignment
+     */
+    public static function fe_cmov(
+        ParagonIE_Sodium_Core_Curve25519_Fe $f,
+        ParagonIE_Sodium_Core_Curve25519_Fe $g,
+        $b = 0
+    ) {
+        /** @var array<int, int> $h */
+        $h = array();
+        $b *= -1;
+        for ($i = 0; $i < 10; ++$i) {
+            $x = (($f[$i] ^ $g[$i]) & $b);
+            $h[$i] = ($f[$i]) ^ $x;
+        }
+        return ParagonIE_Sodium_Core_Curve25519_Fe::fromArray($h);
+    }
+
+    /**
+     * Create a copy of a field element.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
+     * @return ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public static function fe_copy(ParagonIE_Sodium_Core_Curve25519_Fe $f)
+    {
+        $h = clone $f;
+        return $h;
+    }
+
+    /**
+     * Give: 32-byte string.
+     * Receive: A field element object to use for internal calculations.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $s
+     * @return ParagonIE_Sodium_Core_Curve25519_Fe
+     * @throws RangeException
+     * @throws TypeError
+     */
+    public static function fe_frombytes($s)
+    {
+        if (self::strlen($s) !== 32) {
+            throw new RangeException('Expected a 32-byte string.');
+        }
+        /** @var int $h0 */
+        $h0 = self::load_4($s);
+        /** @var int $h1 */
+        $h1 = self::load_3(self::substr($s, 4, 3)) << 6;
+        /** @var int $h2 */
+        $h2 = self::load_3(self::substr($s, 7, 3)) << 5;
+        /** @var int $h3 */
+        $h3 = self::load_3(self::substr($s, 10, 3)) << 3;
+        /** @var int $h4 */
+        $h4 = self::load_3(self::substr($s, 13, 3)) << 2;
+        /** @var int $h5 */
+        $h5 = self::load_4(self::substr($s, 16, 4));
+        /** @var int $h6 */
+        $h6 = self::load_3(self::substr($s, 20, 3)) << 7;
+        /** @var int $h7 */
+        $h7 = self::load_3(self::substr($s, 23, 3)) << 5;
+        /** @var int $h8 */
+        $h8 = self::load_3(self::substr($s, 26, 3)) << 4;
+        /** @var int $h9 */
+        $h9 = (self::load_3(self::substr($s, 29, 3)) & 8388607) << 2;
+
+        /** @var int $carry9 */
+        $carry9 = ($h9 + (1 << 24)) >> 25;
+        $h0 += self::mul($carry9, 19, 5);
+        $h9 -= $carry9 << 25;
+        /** @var int $carry1 */
+        $carry1 = ($h1 + (1 << 24)) >> 25;
+        $h2 += $carry1;
+        $h1 -= $carry1 << 25;
+        /** @var int $carry3 */
+        $carry3 = ($h3 + (1 << 24)) >> 25;
+        $h4 += $carry3;
+        $h3 -= $carry3 << 25;
+        /** @var int $carry5 */
+        $carry5 = ($h5 + (1 << 24)) >> 25;
+        $h6 += $carry5;
+        $h5 -= $carry5 << 25;
+        /** @var int $carry7 */
+        $carry7 = ($h7 + (1 << 24)) >> 25;
+        $h8 += $carry7;
+        $h7 -= $carry7 << 25;
+
+        /** @var int $carry0 */
+        $carry0 = ($h0 + (1 << 25)) >> 26;
+        $h1 += $carry0;
+        $h0 -= $carry0 << 26;
+        /** @var int $carry2 */
+        $carry2 = ($h2 + (1 << 25)) >> 26;
+        $h3 += $carry2;
+        $h2 -= $carry2 << 26;
+        /** @var int $carry4 */
+        $carry4 = ($h4 + (1 << 25)) >> 26;
+        $h5 += $carry4;
+        $h4 -= $carry4 << 26;
+        /** @var int $carry6 */
+        $carry6 = ($h6 + (1 << 25)) >> 26;
+        $h7 += $carry6;
+        $h6 -= $carry6 << 26;
+        /** @var int $carry8 */
+        $carry8 = ($h8 + (1 << 25)) >> 26;
+        $h9 += $carry8;
+        $h8 -= $carry8 << 26;
+
+        return ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+            array(
+                (int) $h0,
+                (int) $h1,
+                (int) $h2,
+                (int) $h3,
+                (int) $h4,
+                (int) $h5,
+                (int) $h6,
+                (int) $h7,
+                (int) $h8,
+                (int) $h9
+            )
+        );
+    }
+
+    /**
+     * Convert a field element to a byte string.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $h
+     * @return string
+     */
+    public static function fe_tobytes(ParagonIE_Sodium_Core_Curve25519_Fe $h)
+    {
+        /** @var int $h0 */
+        $h0 = (int) $h[0];
+        /** @var int $h1 */
+        $h1 = (int) $h[1];
+        /** @var int $h2 */
+        $h2 = (int) $h[2];
+        /** @var int $h3 */
+        $h3 = (int) $h[3];
+        /** @var int $h4 */
+        $h4 = (int) $h[4];
+        /** @var int $h5 */
+        $h5 = (int) $h[5];
+        /** @var int $h6 */
+        $h6 = (int) $h[6];
+        /** @var int $h7 */
+        $h7 = (int) $h[7];
+        /** @var int $h8 */
+        $h8 = (int) $h[8];
+        /** @var int $h9 */
+        $h9 = (int) $h[9];
+
+        /** @var int $q */
+        $q = (self::mul($h9, 19, 5) + (1 << 24)) >> 25;
+        /** @var int $q */
+        $q = ($h0 + $q) >> 26;
+        /** @var int $q */
+        $q = ($h1 + $q) >> 25;
+        /** @var int $q */
+        $q = ($h2 + $q) >> 26;
+        /** @var int $q */
+        $q = ($h3 + $q) >> 25;
+        /** @var int $q */
+        $q = ($h4 + $q) >> 26;
+        /** @var int $q */
+        $q = ($h5 + $q) >> 25;
+        /** @var int $q */
+        $q = ($h6 + $q) >> 26;
+        /** @var int $q */
+        $q = ($h7 + $q) >> 25;
+        /** @var int $q */
+        $q = ($h8 + $q) >> 26;
+        /** @var int $q */
+        $q = ($h9 + $q) >> 25;
+
+        $h0 += self::mul($q, 19, 5);
+
+        /** @var int $carry0 */
+        $carry0 = $h0 >> 26;
+        $h1 += $carry0;
+        $h0 -= $carry0 << 26;
+        /** @var int $carry1 */
+        $carry1 = $h1 >> 25;
+        $h2 += $carry1;
+        $h1 -= $carry1 << 25;
+        /** @var int $carry2 */
+        $carry2 = $h2 >> 26;
+        $h3 += $carry2;
+        $h2 -= $carry2 << 26;
+        /** @var int $carry3 */
+        $carry3 = $h3 >> 25;
+        $h4 += $carry3;
+        $h3 -= $carry3 << 25;
+        /** @var int $carry4 */
+        $carry4 = $h4 >> 26;
+        $h5 += $carry4;
+        $h4 -= $carry4 << 26;
+        /** @var int $carry5 */
+        $carry5 = $h5 >> 25;
+        $h6 += $carry5;
+        $h5 -= $carry5 << 25;
+        /** @var int $carry6 */
+        $carry6 = $h6 >> 26;
+        $h7 += $carry6;
+        $h6 -= $carry6 << 26;
+        /** @var int $carry7 */
+        $carry7 = $h7 >> 25;
+        $h8 += $carry7;
+        $h7 -= $carry7 << 25;
+        /** @var int $carry8 */
+        $carry8 = $h8 >> 26;
+        $h9 += $carry8;
+        $h8 -= $carry8 << 26;
+        /** @var int $carry9 */
+        $carry9 = $h9 >> 25;
+        $h9 -= $carry9 << 25;
+
+        /**
+         * @var array<int, int>
+         */
+        $s = array(
+            (int) (($h0 >> 0) & 0xff),
+            (int) (($h0 >> 8) & 0xff),
+            (int) (($h0 >> 16) & 0xff),
+            (int) ((($h0 >> 24) | ($h1 << 2)) & 0xff),
+            (int) (($h1 >> 6) & 0xff),
+            (int) (($h1 >> 14) & 0xff),
+            (int) ((($h1 >> 22) | ($h2 << 3)) & 0xff),
+            (int) (($h2 >> 5) & 0xff),
+            (int) (($h2 >> 13) & 0xff),
+            (int) ((($h2 >> 21) | ($h3 << 5)) & 0xff),
+            (int) (($h3 >> 3) & 0xff),
+            (int) (($h3 >> 11) & 0xff),
+            (int) ((($h3 >> 19) | ($h4 << 6)) & 0xff),
+            (int) (($h4 >> 2) & 0xff),
+            (int) (($h4 >> 10) & 0xff),
+            (int) (($h4 >> 18) & 0xff),
+            (int) (($h5 >> 0) & 0xff),
+            (int) (($h5 >> 8) & 0xff),
+            (int) (($h5 >> 16) & 0xff),
+            (int) ((($h5 >> 24) | ($h6 << 1)) & 0xff),
+            (int) (($h6 >> 7) & 0xff),
+            (int) (($h6 >> 15) & 0xff),
+            (int) ((($h6 >> 23) | ($h7 << 3)) & 0xff),
+            (int) (($h7 >> 5) & 0xff),
+            (int) (($h7 >> 13) & 0xff),
+            (int) ((($h7 >> 21) | ($h8 << 4)) & 0xff),
+            (int) (($h8 >> 4) & 0xff),
+            (int) (($h8 >> 12) & 0xff),
+            (int) ((($h8 >> 20) | ($h9 << 6)) & 0xff),
+            (int) (($h9 >> 2) & 0xff),
+            (int) (($h9 >> 10) & 0xff),
+            (int) (($h9 >> 18) & 0xff)
+        );
+        return self::intArrayToString($s);
+    }
+
+    /**
+     * Is a field element negative? (1 = yes, 0 = no. Used in calculations.)
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
+     * @return int
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function fe_isnegative(ParagonIE_Sodium_Core_Curve25519_Fe $f)
+    {
+        $str = self::fe_tobytes($f);
+        return (int) (self::chrToInt($str[0]) & 1);
+    }
+
+    /**
+     * Returns 0 if this field element results in all NUL bytes.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function fe_isnonzero(ParagonIE_Sodium_Core_Curve25519_Fe $f)
+    {
+        static $zero;
+        if ($zero === null) {
+            $zero = str_repeat("\x00", 32);
+        }
+        /** @var string $zero */
+        /** @var string $str */
+        $str = self::fe_tobytes($f);
+        return !self::verify_32($str, (string) $zero);
+    }
+
+    /**
+     * Multiply two field elements
+     *
+     * h = f * g
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @security Is multiplication a source of timing leaks? If so, can we do
+     *           anything to prevent that from happening?
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $g
+     * @return ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public static function fe_mul(
+        ParagonIE_Sodium_Core_Curve25519_Fe $f,
+        ParagonIE_Sodium_Core_Curve25519_Fe $g
+    ) {
+        /** @var int $f0 */
+        $f0 = $f[0];
+        /** @var int $f1 */
+        $f1 = $f[1];
+        /** @var int $f2 */
+        $f2 = $f[2];
+        /** @var int $f3 */
+        $f3 = $f[3];
+        /** @var int $f4 */
+        $f4 = $f[4];
+        /** @var int $f5 */
+        $f5 = $f[5];
+        /** @var int $f6 */
+        $f6 = $f[6];
+        /** @var int $f7 */
+        $f7 = $f[7];
+        /** @var int $f8 */
+        $f8 = $f[8];
+        /** @var int $f9 */
+        $f9 = $f[9];
+        /** @var int $g0 */
+        $g0 = $g[0];
+        /** @var int $g1 */
+        $g1 = $g[1];
+        /** @var int $g2 */
+        $g2 = $g[2];
+        /** @var int $g3 */
+        $g3 = $g[3];
+        /** @var int $g4 */
+        $g4 = $g[4];
+        /** @var int $g5 */
+        $g5 = $g[5];
+        /** @var int $g6 */
+        $g6 = $g[6];
+        /** @var int $g7 */
+        $g7 = $g[7];
+        /** @var int $g8 */
+        $g8 = $g[8];
+        /** @var int $g9 */
+        $g9 = $g[9];
+        $g1_19 = self::mul($g1, 19, 5);
+        $g2_19 = self::mul($g2, 19, 5);
+        $g3_19 = self::mul($g3, 19, 5);
+        $g4_19 = self::mul($g4, 19, 5);
+        $g5_19 = self::mul($g5, 19, 5);
+        $g6_19 = self::mul($g6, 19, 5);
+        $g7_19 = self::mul($g7, 19, 5);
+        $g8_19 = self::mul($g8, 19, 5);
+        $g9_19 = self::mul($g9, 19, 5);
+        /** @var int $f1_2 */
+        $f1_2 = $f1 << 1;
+        /** @var int $f3_2 */
+        $f3_2 = $f3 << 1;
+        /** @var int $f5_2 */
+        $f5_2 = $f5 << 1;
+        /** @var int $f7_2 */
+        $f7_2 = $f7 << 1;
+        /** @var int $f9_2 */
+        $f9_2 = $f9 << 1;
+        $f0g0    = self::mul($f0,    $g0, 26);
+        $f0g1    = self::mul($f0,    $g1, 25);
+        $f0g2    = self::mul($f0,    $g2, 26);
+        $f0g3    = self::mul($f0,    $g3, 25);
+        $f0g4    = self::mul($f0,    $g4, 26);
+        $f0g5    = self::mul($f0,    $g5, 25);
+        $f0g6    = self::mul($f0,    $g6, 26);
+        $f0g7    = self::mul($f0,    $g7, 25);
+        $f0g8    = self::mul($f0,    $g8, 26);
+        $f0g9    = self::mul($f0,    $g9, 26);
+        $f1g0    = self::mul($f1,    $g0, 26);
+        $f1g1_2  = self::mul($f1_2,  $g1, 25);
+        $f1g2    = self::mul($f1,    $g2, 26);
+        $f1g3_2  = self::mul($f1_2,  $g3, 25);
+        $f1g4    = self::mul($f1,    $g4, 26);
+        $f1g5_2  = self::mul($f1_2,  $g5, 25);
+        $f1g6    = self::mul($f1,    $g6, 26);
+        $f1g7_2  = self::mul($f1_2,  $g7, 25);
+        $f1g8    = self::mul($f1,    $g8, 26);
+        $f1g9_38 = self::mul($g9_19, $f1_2, 26);
+        $f2g0    = self::mul($f2,    $g0, 26);
+        $f2g1    = self::mul($f2,    $g1, 25);
+        $f2g2    = self::mul($f2,    $g2, 26);
+        $f2g3    = self::mul($f2,    $g3, 25);
+        $f2g4    = self::mul($f2,    $g4, 26);
+        $f2g5    = self::mul($f2,    $g5, 25);
+        $f2g6    = self::mul($f2,    $g6, 26);
+        $f2g7    = self::mul($f2,    $g7, 25);
+        $f2g8_19 = self::mul($g8_19, $f2, 26);
+        $f2g9_19 = self::mul($g9_19, $f2, 26);
+        $f3g0    = self::mul($f3,    $g0, 26);
+        $f3g1_2  = self::mul($f3_2,  $g1, 25);
+        $f3g2    = self::mul($f3,    $g2, 26);
+        $f3g3_2  = self::mul($f3_2,  $g3, 25);
+        $f3g4    = self::mul($f3,    $g4, 26);
+        $f3g5_2  = self::mul($f3_2,  $g5, 25);
+        $f3g6    = self::mul($f3,    $g6, 26);
+        $f3g7_38 = self::mul($g7_19, $f3_2, 26);
+        $f3g8_19 = self::mul($g8_19, $f3, 25);
+        $f3g9_38 = self::mul($g9_19, $f3_2, 26);
+        $f4g0    = self::mul($f4,    $g0, 26);
+        $f4g1    = self::mul($f4,    $g1, 25);
+        $f4g2    = self::mul($f4,    $g2, 26);
+        $f4g3    = self::mul($f4,    $g3, 25);
+        $f4g4    = self::mul($f4,    $g4, 26);
+        $f4g5    = self::mul($f4,    $g5, 25);
+        $f4g6_19 = self::mul($g6_19, $f4, 26);
+        $f4g7_19 = self::mul($g7_19, $f4, 26);
+        $f4g8_19 = self::mul($g8_19, $f4, 26);
+        $f4g9_19 = self::mul($g9_19, $f4, 26);
+        $f5g0    = self::mul($f5,    $g0, 26);
+        $f5g1_2  = self::mul($f5_2,  $g1, 25);
+        $f5g2    = self::mul($f5,    $g2, 26);
+        $f5g3_2  = self::mul($f5_2,  $g3, 25);
+        $f5g4    = self::mul($f5,    $g4, 26);
+        $f5g5_38 = self::mul($g5_19, $f5_2, 26);
+        $f5g6_19 = self::mul($g6_19, $f5, 25);
+        $f5g7_38 = self::mul($g7_19, $f5_2, 26);
+        $f5g8_19 = self::mul($g8_19, $f5, 25);
+        $f5g9_38 = self::mul($g9_19, $f5_2, 26);
+        $f6g0    = self::mul($f6,    $g0, 26);
+        $f6g1    = self::mul($f6,    $g1, 25);
+        $f6g2    = self::mul($f6,    $g2, 26);
+        $f6g3    = self::mul($f6,    $g3, 25);
+        $f6g4_19 = self::mul($g4_19, $f6, 26);
+        $f6g5_19 = self::mul($g5_19, $f6, 26);
+        $f6g6_19 = self::mul($g6_19, $f6, 26);
+        $f6g7_19 = self::mul($g7_19, $f6, 26);
+        $f6g8_19 = self::mul($g8_19, $f6, 26);
+        $f6g9_19 = self::mul($g9_19, $f6, 26);
+        $f7g0    = self::mul($f7,    $g0, 26);
+        $f7g1_2  = self::mul($f7_2,  $g1, 25);
+        $f7g2    = self::mul($f7,    $g2, 26);
+        $f7g3_38 = self::mul($g3_19, $f7_2, 26);
+        $f7g4_19 = self::mul($g4_19, $f7, 26);
+        $f7g5_38 = self::mul($g5_19, $f7_2, 26);
+        $f7g6_19 = self::mul($g6_19, $f7, 25);
+        $f7g7_38 = self::mul($g7_19, $f7_2, 26);
+        $f7g8_19 = self::mul($g8_19, $f7, 25);
+        $f7g9_38 = self::mul($g9_19,$f7_2, 26);
+        $f8g0    = self::mul($f8,    $g0, 26);
+        $f8g1    = self::mul($f8,    $g1, 25);
+        $f8g2_19 = self::mul($g2_19, $f8, 26);
+        $f8g3_19 = self::mul($g3_19, $f8, 26);
+        $f8g4_19 = self::mul($g4_19, $f8, 26);
+        $f8g5_19 = self::mul($g5_19, $f8, 26);
+        $f8g6_19 = self::mul($g6_19, $f8, 26);
+        $f8g7_19 = self::mul($g7_19, $f8, 26);
+        $f8g8_19 = self::mul($g8_19, $f8, 26);
+        $f8g9_19 = self::mul($g9_19, $f8, 26);
+        $f9g0    = self::mul($f9,    $g0, 26);
+        $f9g1_38 = self::mul($g1_19, $f9_2, 26);
+        $f9g2_19 = self::mul($g2_19, $f9, 25);
+        $f9g3_38 = self::mul($g3_19, $f9_2, 26);
+        $f9g4_19 = self::mul($g4_19, $f9, 25);
+        $f9g5_38 = self::mul($g5_19, $f9_2, 26);
+        $f9g6_19 = self::mul($g6_19, $f9, 25);
+        $f9g7_38 = self::mul($g7_19, $f9_2, 26);
+        $f9g8_19 = self::mul($g8_19, $f9, 25);
+        $f9g9_38 = self::mul($g9_19, $f9_2, 26);
+        $h0 = $f0g0 + $f1g9_38 + $f2g8_19 + $f3g7_38 + $f4g6_19 + $f5g5_38 + $f6g4_19 + $f7g3_38 + $f8g2_19 + $f9g1_38;
+        $h1 = $f0g1 + $f1g0    + $f2g9_19 + $f3g8_19 + $f4g7_19 + $f5g6_19 + $f6g5_19 + $f7g4_19 + $f8g3_19 + $f9g2_19;
+        $h2 = $f0g2 + $f1g1_2  + $f2g0    + $f3g9_38 + $f4g8_19 + $f5g7_38 + $f6g6_19 + $f7g5_38 + $f8g4_19 + $f9g3_38;
+        $h3 = $f0g3 + $f1g2    + $f2g1    + $f3g0    + $f4g9_19 + $f5g8_19 + $f6g7_19 + $f7g6_19 + $f8g5_19 + $f9g4_19;
+        $h4 = $f0g4 + $f1g3_2  + $f2g2    + $f3g1_2  + $f4g0    + $f5g9_38 + $f6g8_19 + $f7g7_38 + $f8g6_19 + $f9g5_38;
+        $h5 = $f0g5 + $f1g4    + $f2g3    + $f3g2    + $f4g1    + $f5g0    + $f6g9_19 + $f7g8_19 + $f8g7_19 + $f9g6_19;
+        $h6 = $f0g6 + $f1g5_2  + $f2g4    + $f3g3_2  + $f4g2    + $f5g1_2  + $f6g0    + $f7g9_38 + $f8g8_19 + $f9g7_38;
+        $h7 = $f0g7 + $f1g6    + $f2g5    + $f3g4    + $f4g3    + $f5g2    + $f6g1    + $f7g0    + $f8g9_19 + $f9g8_19;
+        $h8 = $f0g8 + $f1g7_2  + $f2g6    + $f3g5_2  + $f4g4    + $f5g3_2  + $f6g2    + $f7g1_2  + $f8g0    + $f9g9_38;
+        $h9 = $f0g9 + $f1g8    + $f2g7    + $f3g6    + $f4g5    + $f5g4    + $f6g3    + $f7g2    + $f8g1    + $f9g0   ;
+
+        /** @var int $carry0 */
+        $carry0 = ($h0 + (1 << 25)) >> 26;
+        $h1 += $carry0;
+        $h0 -= $carry0 << 26;
+        /** @var int $carry4 */
+        $carry4 = ($h4 + (1 << 25)) >> 26;
+        $h5 += $carry4;
+        $h4 -= $carry4 << 26;
+
+        /** @var int $carry1 */
+        $carry1 = ($h1 + (1 << 24)) >> 25;
+        $h2 += $carry1;
+        $h1 -= $carry1 << 25;
+        /** @var int $carry5 */
+        $carry5 = ($h5 + (1 << 24)) >> 25;
+        $h6 += $carry5;
+        $h5 -= $carry5 << 25;
+
+        /** @var int $carry2 */
+        $carry2 = ($h2 + (1 << 25)) >> 26;
+        $h3 += $carry2;
+        $h2 -= $carry2 << 26;
+        /** @var int $carry6 */
+        $carry6 = ($h6 + (1 << 25)) >> 26;
+        $h7 += $carry6;
+        $h6 -= $carry6 << 26;
+
+        /** @var int $carry3 */
+        $carry3 = ($h3 + (1 << 24)) >> 25;
+        $h4 += $carry3;
+        $h3 -= $carry3 << 25;
+        /** @var int $carry7 */
+        $carry7 = ($h7 + (1 << 24)) >> 25;
+        $h8 += $carry7;
+        $h7 -= $carry7 << 25;
+
+        /** @var int $carry4 */
+        $carry4 = ($h4 + (1 << 25)) >> 26;
+        $h5 += $carry4;
+        $h4 -= $carry4 << 26;
+        /** @var int $carry8 */
+        $carry8 = ($h8 + (1 << 25)) >> 26;
+        $h9 += $carry8;
+        $h8 -= $carry8 << 26;
+
+        /** @var int $carry9 */
+        $carry9 = ($h9 + (1 << 24)) >> 25;
+        $h0 += self::mul($carry9, 19, 5);
+        $h9 -= $carry9 << 25;
+
+        /** @var int $carry0 */
+        $carry0 = ($h0 + (1 << 25)) >> 26;
+        $h1 += $carry0;
+        $h0 -= $carry0 << 26;
+
+        return ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+            array(
+                (int) $h0,
+                (int) $h1,
+                (int) $h2,
+                (int) $h3,
+                (int) $h4,
+                (int) $h5,
+                (int) $h6,
+                (int) $h7,
+                (int) $h8,
+                (int) $h9
+            )
+        );
+    }
+
+    /**
+     * Get the negative values for each piece of the field element.
+     *
+     * h = -f
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
+     * @return ParagonIE_Sodium_Core_Curve25519_Fe
+     * @psalm-suppress MixedAssignment
+     */
+    public static function fe_neg(ParagonIE_Sodium_Core_Curve25519_Fe $f)
+    {
+        $h = new ParagonIE_Sodium_Core_Curve25519_Fe();
+        for ($i = 0; $i < 10; ++$i) {
+            $h[$i] = -$f[$i];
+        }
+        return $h;
+    }
+
+    /**
+     * Square a field element
+     *
+     * h = f * f
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
+     * @return ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public static function fe_sq(ParagonIE_Sodium_Core_Curve25519_Fe $f)
+    {
+        $f0 = (int) $f[0];
+        $f1 = (int) $f[1];
+        $f2 = (int) $f[2];
+        $f3 = (int) $f[3];
+        $f4 = (int) $f[4];
+        $f5 = (int) $f[5];
+        $f6 = (int) $f[6];
+        $f7 = (int) $f[7];
+        $f8 = (int) $f[8];
+        $f9 = (int) $f[9];
+
+        /** @var int $f0_2 */
+        $f0_2 = $f0 << 1;
+        /** @var int $f1_2 */
+        $f1_2 = $f1 << 1;
+        /** @var int $f2_2 */
+        $f2_2 = $f2 << 1;
+        /** @var int $f3_2 */
+        $f3_2 = $f3 << 1;
+        /** @var int $f4_2 */
+        $f4_2 = $f4 << 1;
+        /** @var int $f5_2 */
+        $f5_2 = $f5 << 1;
+        /** @var int $f6_2 */
+        $f6_2 = $f6 << 1;
+        /** @var int $f7_2 */
+        $f7_2 = $f7 << 1;
+        $f5_38 = self::mul($f5, 38, 6);
+        $f6_19 = self::mul($f6, 19, 5);
+        $f7_38 = self::mul($f7, 38, 6);
+        $f8_19 = self::mul($f8, 19, 5);
+        $f9_38 = self::mul($f9, 38, 6);
+        $f0f0    = self::mul($f0,    $f0,    25);
+        $f0f1_2  = self::mul($f0_2,  $f1,    24);
+        $f0f2_2  = self::mul($f0_2,  $f2,    26);
+        $f0f3_2  = self::mul($f0_2,  $f3,    24);
+        $f0f4_2  = self::mul($f0_2,  $f4,    25);
+        $f0f5_2  = self::mul($f0_2,  $f5,    25);
+        $f0f6_2  = self::mul($f0_2,  $f6,    25);
+        $f0f7_2  = self::mul($f0_2,  $f7,    24);
+        $f0f8_2  = self::mul($f0_2,  $f8,    25);
+        $f0f9_2  = self::mul($f0_2,  $f9,    25);
+        $f1f1_2  = self::mul($f1_2,  $f1,    24);
+        $f1f2_2  = self::mul($f1_2,  $f2,    26);
+        $f1f3_4  = self::mul($f1_2,  $f3_2,  25);
+        $f1f4_2  = self::mul($f1_2,  $f4,    25);
+        $f1f5_4  = self::mul($f1_2,  $f5_2,  26);
+        $f1f6_2  = self::mul($f1_2,  $f6,    25);
+        $f1f7_4  = self::mul($f1_2,  $f7_2,  25);
+        $f1f8_2  = self::mul($f1_2,  $f8,    25);
+        $f1f9_76 = self::mul($f9_38, $f1_2,  25);
+        $f2f2    = self::mul($f2,    $f2,    26);
+        $f2f3_2  = self::mul($f2_2,  $f3,    24);
+        $f2f4_2  = self::mul($f2_2,  $f4,    25);
+        $f2f5_2  = self::mul($f2_2,  $f5,    25);
+        $f2f6_2  = self::mul($f2_2,  $f6,    25);
+        $f2f7_2  = self::mul($f2_2,  $f7,    25);
+        $f2f8_38 = self::mul($f8_19, $f2_2,  27);
+        $f2f9_38 = self::mul($f9_38, $f2,    26);
+        $f3f3_2  = self::mul($f3_2,  $f3,    25);
+        $f3f4_2  = self::mul($f3_2,  $f4,    25);
+        $f3f5_4  = self::mul($f3_2,  $f5_2,  26);
+        $f3f6_2  = self::mul($f3_2,  $f6,    25);
+        $f3f7_76 = self::mul($f7_38, $f3_2,  25);
+        $f3f8_38 = self::mul($f8_19, $f3_2,  25);
+        $f3f9_76 = self::mul($f9_38, $f3_2,  25);
+        $f4f4    = self::mul($f4,    $f4,    25);
+        $f4f5_2  = self::mul($f4_2,  $f5,    25);
+        $f4f6_38 = self::mul($f6_19, $f4_2,  26);
+        $f4f7_38 = self::mul($f7_38, $f4,    25);
+        $f4f8_38 = self::mul($f8_19, $f4_2,  26);
+        $f4f9_38 = self::mul($f9_38, $f4,    25);
+        $f5f5_38 = self::mul($f5_38, $f5,    25);
+        $f5f6_38 = self::mul($f6_19, $f5_2,  26);
+        $f5f7_76 = self::mul($f7_38, $f5_2,  26);
+        $f5f8_38 = self::mul($f8_19, $f5_2,  26);
+        $f5f9_76 = self::mul($f9_38, $f5_2,  26);
+        $f6f6_19 = self::mul($f6_19, $f6,    25);
+        $f6f7_38 = self::mul($f7_38, $f6,    25);
+        $f6f8_38 = self::mul($f8_19, $f6_2,  26);
+        $f6f9_38 = self::mul($f9_38, $f6,    25);
+        $f7f7_38 = self::mul($f7_38, $f7,    24);
+        $f7f8_38 = self::mul($f8_19, $f7_2,  25);
+        $f7f9_76 = self::mul($f9_38, $f7_2,  25);
+        $f8f8_19 = self::mul($f8_19, $f8,    25);
+        $f8f9_38 = self::mul($f9_38, $f8,    25);
+        $f9f9_38 = self::mul($f9_38, $f9,    25);
+        $h0 = $f0f0   + $f1f9_76 + $f2f8_38 + $f3f7_76 + $f4f6_38 + $f5f5_38;
+        $h1 = $f0f1_2 + $f2f9_38 + $f3f8_38 + $f4f7_38 + $f5f6_38;
+        $h2 = $f0f2_2 + $f1f1_2  + $f3f9_76 + $f4f8_38 + $f5f7_76 + $f6f6_19;
+        $h3 = $f0f3_2 + $f1f2_2  + $f4f9_38 + $f5f8_38 + $f6f7_38;
+        $h4 = $f0f4_2 + $f1f3_4  + $f2f2    + $f5f9_76 + $f6f8_38 + $f7f7_38;
+        $h5 = $f0f5_2 + $f1f4_2  + $f2f3_2  + $f6f9_38 + $f7f8_38;
+        $h6 = $f0f6_2 + $f1f5_4  + $f2f4_2  + $f3f3_2  + $f7f9_76 + $f8f8_19;
+        $h7 = $f0f7_2 + $f1f6_2  + $f2f5_2  + $f3f4_2  + $f8f9_38;
+        $h8 = $f0f8_2 + $f1f7_4  + $f2f6_2  + $f3f5_4  + $f4f4    + $f9f9_38;
+        $h9 = $f0f9_2 + $f1f8_2  + $f2f7_2  + $f3f6_2  + $f4f5_2;
+
+        /** @var int $carry0 */
+        $carry0 = ($h0 + (1 << 25)) >> 26;
+        $h1 += $carry0;
+        $h0 -= $carry0 << 26;
+        /** @var int $carry4 */
+        $carry4 = ($h4 + (1 << 25)) >> 26;
+        $h5 += $carry4;
+        $h4 -= $carry4 << 26;
+
+        /** @var int $carry1 */
+        $carry1 = ($h1 + (1 << 24)) >> 25;
+        $h2 += $carry1;
+        $h1 -= $carry1 << 25;
+        /** @var int $carry5 */
+        $carry5 = ($h5 + (1 << 24)) >> 25;
+        $h6 += $carry5;
+        $h5 -= $carry5 << 25;
+
+        /** @var int $carry2 */
+        $carry2 = ($h2 + (1 << 25)) >> 26;
+        $h3 += $carry2;
+        $h2 -= $carry2 << 26;
+        /** @var int $carry6 */
+        $carry6 = ($h6 + (1 << 25)) >> 26;
+        $h7 += $carry6;
+        $h6 -= $carry6 << 26;
+
+        /** @var int $carry3 */
+        $carry3 = ($h3 + (1 << 24)) >> 25;
+        $h4 += $carry3;
+        $h3 -= $carry3 << 25;
+        /** @var int $carry7 */
+        $carry7 = ($h7 + (1 << 24)) >> 25;
+        $h8 += $carry7;
+        $h7 -= $carry7 << 25;
+
+        /** @var int $carry4 */
+        $carry4 = ($h4 + (1 << 25)) >> 26;
+        $h5 += $carry4;
+        $h4 -= $carry4 << 26;
+        /** @var int $carry8 */
+        $carry8 = ($h8 + (1 << 25)) >> 26;
+        $h9 += $carry8;
+        $h8 -= $carry8 << 26;
+
+        /** @var int $carry9 */
+        $carry9 = ($h9 + (1 << 24)) >> 25;
+        $h0 += self::mul($carry9, 19, 5);
+        $h9 -= $carry9 << 25;
+
+        /** @var int $carry0 */
+        $carry0 = ($h0 + (1 << 25)) >> 26;
+        $h1 += $carry0;
+        $h0 -= $carry0 << 26;
+
+        return ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+            array(
+                (int) $h0,
+                (int) $h1,
+                (int) $h2,
+                (int) $h3,
+                (int) $h4,
+                (int) $h5,
+                (int) $h6,
+                (int) $h7,
+                (int) $h8,
+                (int) $h9
+            )
+        );
+    }
+
+
+    /**
+     * Square and double a field element
+     *
+     * h = 2 * f * f
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
+     * @return ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public static function fe_sq2(ParagonIE_Sodium_Core_Curve25519_Fe $f)
+    {
+        $f0 = (int) $f[0];
+        $f1 = (int) $f[1];
+        $f2 = (int) $f[2];
+        $f3 = (int) $f[3];
+        $f4 = (int) $f[4];
+        $f5 = (int) $f[5];
+        $f6 = (int) $f[6];
+        $f7 = (int) $f[7];
+        $f8 = (int) $f[8];
+        $f9 = (int) $f[9];
+
+        /** @var int $f0_2 */
+        $f0_2 = $f0 << 1;
+        /** @var int $f1_2 */
+        $f1_2 = $f1 << 1;
+        /** @var int $f2_2 */
+        $f2_2 = $f2 << 1;
+        /** @var int $f3_2 */
+        $f3_2 = $f3 << 1;
+        /** @var int $f4_2 */
+        $f4_2 = $f4 << 1;
+        /** @var int $f5_2 */
+        $f5_2 = $f5 << 1;
+        /** @var int $f6_2 */
+        $f6_2 = $f6 << 1;
+        /** @var int $f7_2 */
+        $f7_2 = $f7 << 1;
+        $f5_38 = self::mul($f5, 38, 6); /* 1.959375*2^30 */
+        $f6_19 = self::mul($f6, 19, 5); /* 1.959375*2^30 */
+        $f7_38 = self::mul($f7, 38, 6); /* 1.959375*2^30 */
+        $f8_19 = self::mul($f8, 19, 5); /* 1.959375*2^30 */
+        $f9_38 = self::mul($f9, 38, 6); /* 1.959375*2^30 */
+        $f0f0 = self::mul($f0, $f0, 24);
+        $f0f1_2 = self::mul($f0_2, $f1, 24);
+        $f0f2_2 = self::mul($f0_2, $f2, 24);
+        $f0f3_2 = self::mul($f0_2, $f3, 24);
+        $f0f4_2 = self::mul($f0_2, $f4, 24);
+        $f0f5_2 = self::mul($f0_2, $f5, 24);
+        $f0f6_2 = self::mul($f0_2, $f6, 24);
+        $f0f7_2 = self::mul($f0_2, $f7, 24);
+        $f0f8_2 = self::mul($f0_2, $f8, 24);
+        $f0f9_2 = self::mul($f0_2, $f9, 24);
+        $f1f1_2 = self::mul($f1_2,  $f1, 24);
+        $f1f2_2 = self::mul($f1_2,  $f2, 24);
+        $f1f3_4 = self::mul($f1_2,  $f3_2, 24);
+        $f1f4_2 = self::mul($f1_2,  $f4, 24);
+        $f1f5_4 = self::mul($f1_2,  $f5_2, 24);
+        $f1f6_2 = self::mul($f1_2,  $f6, 24);
+        $f1f7_4 = self::mul($f1_2,  $f7_2, 24);
+        $f1f8_2 = self::mul($f1_2,  $f8, 24);
+        $f1f9_76 = self::mul($f9_38, $f1_2, 24);
+        $f2f2 = self::mul($f2,  $f2, 24);
+        $f2f3_2 = self::mul($f2_2,  $f3, 24);
+        $f2f4_2 = self::mul($f2_2,  $f4, 24);
+        $f2f5_2 = self::mul($f2_2,  $f5, 24);
+        $f2f6_2 = self::mul($f2_2,  $f6, 24);
+        $f2f7_2 = self::mul($f2_2,  $f7, 24);
+        $f2f8_38 = self::mul($f8_19, $f2_2, 25);
+        $f2f9_38 = self::mul($f9_38, $f2, 24);
+        $f3f3_2 = self::mul($f3_2,  $f3, 24);
+        $f3f4_2 = self::mul($f3_2,  $f4, 24);
+        $f3f5_4 = self::mul($f3_2,  $f5_2, 24);
+        $f3f6_2 = self::mul($f3_2,  $f6, 24);
+        $f3f7_76 = self::mul($f7_38, $f3_2, 24);
+        $f3f8_38 = self::mul($f8_19, $f3_2, 24);
+        $f3f9_76 = self::mul($f9_38, $f3_2, 24);
+        $f4f4 = self::mul($f4,  $f4, 24);
+        $f4f5_2 = self::mul($f4_2,  $f5, 24);
+        $f4f6_38 = self::mul($f6_19, $f4_2, 25);
+        $f4f7_38 = self::mul($f7_38, $f4, 24);
+        $f4f8_38 = self::mul($f8_19, $f4_2, 25);
+        $f4f9_38 = self::mul($f9_38, $f4, 24);
+        $f5f5_38 = self::mul($f5_38, $f5, 24);
+        $f5f6_38 = self::mul($f6_19, $f5_2, 24);
+        $f5f7_76 = self::mul($f7_38, $f5_2, 24);
+        $f5f8_38 = self::mul($f8_19, $f5_2, 24);
+        $f5f9_76 = self::mul($f9_38, $f5_2, 24);
+        $f6f6_19 = self::mul($f6_19, $f6, 24);
+        $f6f7_38 = self::mul($f7_38, $f6, 24);
+        $f6f8_38 = self::mul($f8_19, $f6_2, 25);
+        $f6f9_38 = self::mul($f9_38, $f6, 24);
+        $f7f7_38 = self::mul($f7_38, $f7, 24);
+        $f7f8_38 = self::mul($f8_19, $f7_2, 24);
+        $f7f9_76 = self::mul($f9_38, $f7_2, 24);
+        $f8f8_19 = self::mul($f8_19, $f8, 24);
+        $f8f9_38 = self::mul($f9_38, $f8, 24);
+        $f9f9_38 = self::mul($f9_38, $f9, 24);
+
+        /** @var int $h0 */
+        $h0 = (int) ($f0f0 + $f1f9_76 + $f2f8_38 + $f3f7_76 + $f4f6_38 + $f5f5_38) << 1;
+        /** @var int $h1 */
+        $h1 = (int) ($f0f1_2 + $f2f9_38 + $f3f8_38 + $f4f7_38 + $f5f6_38) << 1;
+        /** @var int $h2 */
+        $h2 = (int) ($f0f2_2 + $f1f1_2  + $f3f9_76 + $f4f8_38 + $f5f7_76 + $f6f6_19) << 1;
+        /** @var int $h3 */
+        $h3 = (int) ($f0f3_2 + $f1f2_2  + $f4f9_38 + $f5f8_38 + $f6f7_38) << 1;
+        /** @var int $h4 */
+        $h4 = (int) ($f0f4_2 + $f1f3_4  + $f2f2    + $f5f9_76 + $f6f8_38 + $f7f7_38) << 1;
+        /** @var int $h5 */
+        $h5 = (int) ($f0f5_2 + $f1f4_2  + $f2f3_2  + $f6f9_38 + $f7f8_38) << 1;
+        /** @var int $h6 */
+        $h6 = (int) ($f0f6_2 + $f1f5_4  + $f2f4_2  + $f3f3_2  + $f7f9_76 + $f8f8_19) << 1;
+        /** @var int $h7 */
+        $h7 = (int) ($f0f7_2 + $f1f6_2  + $f2f5_2  + $f3f4_2  + $f8f9_38) << 1;
+        /** @var int $h8 */
+        $h8 = (int) ($f0f8_2 + $f1f7_4  + $f2f6_2  + $f3f5_4  + $f4f4    + $f9f9_38) << 1;
+        /** @var int $h9 */
+        $h9 = (int) ($f0f9_2 + $f1f8_2  + $f2f7_2  + $f3f6_2  + $f4f5_2) << 1;
+
+        /** @var int $carry0 */
+        $carry0 = ($h0 + (1 << 25)) >> 26;
+        $h1 += $carry0;
+        $h0 -= $carry0 << 26;
+        /** @var int $carry4 */
+        $carry4 = ($h4 + (1 << 25)) >> 26;
+        $h5 += $carry4;
+        $h4 -= $carry4 << 26;
+
+        /** @var int $carry1 */
+        $carry1 = ($h1 + (1 << 24)) >> 25;
+        $h2 += $carry1;
+        $h1 -= $carry1 << 25;
+        /** @var int $carry5 */
+        $carry5 = ($h5 + (1 << 24)) >> 25;
+        $h6 += $carry5;
+        $h5 -= $carry5 << 25;
+
+        /** @var int $carry2 */
+        $carry2 = ($h2 + (1 << 25)) >> 26;
+        $h3 += $carry2;
+        $h2 -= $carry2 << 26;
+        /** @var int $carry6 */
+        $carry6 = ($h6 + (1 << 25)) >> 26;
+        $h7 += $carry6;
+        $h6 -= $carry6 << 26;
+
+        /** @var int $carry3 */
+        $carry3 = ($h3 + (1 << 24)) >> 25;
+        $h4 += $carry3;
+        $h3 -= $carry3 << 25;
+        /** @var int $carry7 */
+        $carry7 = ($h7 + (1 << 24)) >> 25;
+        $h8 += $carry7;
+        $h7 -= $carry7 << 25;
+
+        /** @var int $carry4 */
+        $carry4 = ($h4 + (1 << 25)) >> 26;
+        $h5 += $carry4;
+        $h4 -= $carry4 << 26;
+        /** @var int $carry8 */
+        $carry8 = ($h8 + (1 << 25)) >> 26;
+        $h9 += $carry8;
+        $h8 -= $carry8 << 26;
+
+        /** @var int $carry9 */
+        $carry9 = ($h9 + (1 << 24)) >> 25;
+        $h0 += self::mul($carry9, 19, 5);
+        $h9 -= $carry9 << 25;
+
+        /** @var int $carry0 */
+        $carry0 = ($h0 + (1 << 25)) >> 26;
+        $h1 += $carry0;
+        $h0 -= $carry0 << 26;
+
+        return ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+            array(
+                (int) $h0,
+                (int) $h1,
+                (int) $h2,
+                (int) $h3,
+                (int) $h4,
+                (int) $h5,
+                (int) $h6,
+                (int) $h7,
+                (int) $h8,
+                (int) $h9
+            )
+        );
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $Z
+     * @return ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public static function fe_invert(ParagonIE_Sodium_Core_Curve25519_Fe $Z)
+    {
+        $z = clone $Z;
+        $t0 = self::fe_sq($z);
+        $t1 = self::fe_sq($t0);
+        $t1 = self::fe_sq($t1);
+        $t1 = self::fe_mul($z, $t1);
+        $t0 = self::fe_mul($t0, $t1);
+        $t2 = self::fe_sq($t0);
+        $t1 = self::fe_mul($t1, $t2);
+        $t2 = self::fe_sq($t1);
+        for ($i = 1; $i < 5; ++$i) {
+            $t2 = self::fe_sq($t2);
+        }
+        $t1 = self::fe_mul($t2, $t1);
+        $t2 = self::fe_sq($t1);
+        for ($i = 1; $i < 10; ++$i) {
+            $t2 = self::fe_sq($t2);
+        }
+        $t2 = self::fe_mul($t2, $t1);
+        $t3 = self::fe_sq($t2);
+        for ($i = 1; $i < 20; ++$i) {
+            $t3 = self::fe_sq($t3);
+        }
+        $t2 = self::fe_mul($t3, $t2);
+        $t2 = self::fe_sq($t2);
+        for ($i = 1; $i < 10; ++$i) {
+            $t2 = self::fe_sq($t2);
+        }
+        $t1 = self::fe_mul($t2, $t1);
+        $t2 = self::fe_sq($t1);
+        for ($i = 1; $i < 50; ++$i) {
+            $t2 = self::fe_sq($t2);
+        }
+        $t2 = self::fe_mul($t2, $t1);
+        $t3 = self::fe_sq($t2);
+        for ($i = 1; $i < 100; ++$i) {
+            $t3 = self::fe_sq($t3);
+        }
+        $t2 = self::fe_mul($t3, $t2);
+        $t2 = self::fe_sq($t2);
+        for ($i = 1; $i < 50; ++$i) {
+            $t2 = self::fe_sq($t2);
+        }
+        $t1 = self::fe_mul($t2, $t1);
+        $t1 = self::fe_sq($t1);
+        for ($i = 1; $i < 5; ++$i) {
+            $t1 = self::fe_sq($t1);
+        }
+        return self::fe_mul($t1, $t0);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @ref https://github.com/jedisct1/libsodium/blob/68564326e1e9dc57ef03746f85734232d20ca6fb/src/libsodium/crypto_core/curve25519/ref10/curve25519_ref10.c#L1054-L1106
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $z
+     * @return ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public static function fe_pow22523(ParagonIE_Sodium_Core_Curve25519_Fe $z)
+    {
+        # fe_sq(t0, z);
+        # fe_sq(t1, t0);
+        # fe_sq(t1, t1);
+        # fe_mul(t1, z, t1);
+        # fe_mul(t0, t0, t1);
+        # fe_sq(t0, t0);
+        # fe_mul(t0, t1, t0);
+        # fe_sq(t1, t0);
+        $t0 = self::fe_sq($z);
+        $t1 = self::fe_sq($t0);
+        $t1 = self::fe_sq($t1);
+        $t1 = self::fe_mul($z, $t1);
+        $t0 = self::fe_mul($t0, $t1);
+        $t0 = self::fe_sq($t0);
+        $t0 = self::fe_mul($t1, $t0);
+        $t1 = self::fe_sq($t0);
+
+        # for (i = 1; i < 5; ++i) {
+        #     fe_sq(t1, t1);
+        # }
+        for ($i = 1; $i < 5; ++$i) {
+            $t1 = self::fe_sq($t1);
+        }
+
+        # fe_mul(t0, t1, t0);
+        # fe_sq(t1, t0);
+        $t0 = self::fe_mul($t1, $t0);
+        $t1 = self::fe_sq($t0);
+
+        # for (i = 1; i < 10; ++i) {
+        #     fe_sq(t1, t1);
+        # }
+        for ($i = 1; $i < 10; ++$i) {
+            $t1 = self::fe_sq($t1);
+        }
+
+        # fe_mul(t1, t1, t0);
+        # fe_sq(t2, t1);
+        $t1 = self::fe_mul($t1, $t0);
+        $t2 = self::fe_sq($t1);
+
+        # for (i = 1; i < 20; ++i) {
+        #     fe_sq(t2, t2);
+        # }
+        for ($i = 1; $i < 20; ++$i) {
+            $t2 = self::fe_sq($t2);
+        }
+
+        # fe_mul(t1, t2, t1);
+        # fe_sq(t1, t1);
+        $t1 = self::fe_mul($t2, $t1);
+        $t1 = self::fe_sq($t1);
+
+        # for (i = 1; i < 10; ++i) {
+        #     fe_sq(t1, t1);
+        # }
+        for ($i = 1; $i < 10; ++$i) {
+            $t1 = self::fe_sq($t1);
+        }
+
+        # fe_mul(t0, t1, t0);
+        # fe_sq(t1, t0);
+        $t0 = self::fe_mul($t1, $t0);
+        $t1 = self::fe_sq($t0);
+
+        # for (i = 1; i < 50; ++i) {
+        #     fe_sq(t1, t1);
+        # }
+        for ($i = 1; $i < 50; ++$i) {
+            $t1 = self::fe_sq($t1);
+        }
+
+        # fe_mul(t1, t1, t0);
+        # fe_sq(t2, t1);
+        $t1 = self::fe_mul($t1, $t0);
+        $t2 = self::fe_sq($t1);
+
+        # for (i = 1; i < 100; ++i) {
+        #     fe_sq(t2, t2);
+        # }
+        for ($i = 1; $i < 100; ++$i) {
+            $t2 = self::fe_sq($t2);
+        }
+
+        # fe_mul(t1, t2, t1);
+        # fe_sq(t1, t1);
+        $t1 = self::fe_mul($t2, $t1);
+        $t1 = self::fe_sq($t1);
+
+        # for (i = 1; i < 50; ++i) {
+        #     fe_sq(t1, t1);
+        # }
+        for ($i = 1; $i < 50; ++$i) {
+            $t1 = self::fe_sq($t1);
+        }
+
+        # fe_mul(t0, t1, t0);
+        # fe_sq(t0, t0);
+        # fe_sq(t0, t0);
+        # fe_mul(out, t0, z);
+        $t0 = self::fe_mul($t1, $t0);
+        $t0 = self::fe_sq($t0);
+        $t0 = self::fe_sq($t0);
+        return self::fe_mul($t0, $z);
+    }
+
+    /**
+     * Subtract two field elements.
+     *
+     * h = f - g
+     *
+     * Preconditions:
+     * |f| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
+     * |g| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
+     *
+     * Postconditions:
+     * |h| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $g
+     * @return ParagonIE_Sodium_Core_Curve25519_Fe
+     * @psalm-suppress MixedOperand
+     */
+    public static function fe_sub(ParagonIE_Sodium_Core_Curve25519_Fe $f, ParagonIE_Sodium_Core_Curve25519_Fe $g)
+    {
+        return ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+            array(
+                (int) ($f[0] - $g[0]),
+                (int) ($f[1] - $g[1]),
+                (int) ($f[2] - $g[2]),
+                (int) ($f[3] - $g[3]),
+                (int) ($f[4] - $g[4]),
+                (int) ($f[5] - $g[5]),
+                (int) ($f[6] - $g[6]),
+                (int) ($f[7] - $g[7]),
+                (int) ($f[8] - $g[8]),
+                (int) ($f[9] - $g[9])
+            )
+        );
+    }
+
+    /**
+     * Add two group elements.
+     *
+     * r = p + q
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_Cached $q
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P1p1
+     */
+    public static function ge_add(
+        ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p,
+        ParagonIE_Sodium_Core_Curve25519_Ge_Cached $q
+    ) {
+        $r = new ParagonIE_Sodium_Core_Curve25519_Ge_P1p1();
+        $r->X = self::fe_add($p->Y, $p->X);
+        $r->Y = self::fe_sub($p->Y, $p->X);
+        $r->Z = self::fe_mul($r->X, $q->YplusX);
+        $r->Y = self::fe_mul($r->Y, $q->YminusX);
+        $r->T = self::fe_mul($q->T2d, $p->T);
+        $r->X = self::fe_mul($p->Z, $q->Z);
+        $t0   = self::fe_add($r->X, $r->X);
+        $r->X = self::fe_sub($r->Z, $r->Y);
+        $r->Y = self::fe_add($r->Z, $r->Y);
+        $r->Z = self::fe_add($t0, $r->T);
+        $r->T = self::fe_sub($t0, $r->T);
+        return $r;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @ref https://github.com/jedisct1/libsodium/blob/157c4a80c13b117608aeae12178b2d38825f9f8f/src/libsodium/crypto_core/curve25519/ref10/curve25519_ref10.c#L1185-L1215
+     * @param string $a
+     * @return array<int, mixed>
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function slide($a)
+    {
+        if (self::strlen($a) < 256) {
+            if (self::strlen($a) < 16) {
+                $a = str_pad($a, 256, '0', STR_PAD_RIGHT);
+            }
+        }
+        /** @var array<int, int> $r */
+        $r = array();
+
+        /** @var int $i */
+        for ($i = 0; $i < 256; ++$i) {
+            $r[$i] = (int) (
+                1 & (
+                    self::chrToInt($a[(int) ($i >> 3)])
+                        >>
+                    ($i & 7)
+                )
+            );
+        }
+
+        for ($i = 0;$i < 256;++$i) {
+            if ($r[$i]) {
+                for ($b = 1;$b <= 6 && $i + $b < 256;++$b) {
+                    if ($r[$i + $b]) {
+                        if ($r[$i] + ($r[$i + $b] << $b) <= 15) {
+                            $r[$i] += $r[$i + $b] << $b;
+                            $r[$i + $b] = 0;
+                        } elseif ($r[$i] - ($r[$i + $b] << $b) >= -15) {
+                            $r[$i] -= $r[$i + $b] << $b;
+                            for ($k = $i + $b; $k < 256; ++$k) {
+                                if (!$r[$k]) {
+                                    $r[$k] = 1;
+                                    break;
+                                }
+                                $r[$k] = 0;
+                            }
+                        } else {
+                            break;
+                        }
+                    }
+                }
+            }
+        }
+        return $r;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $s
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P3
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function ge_frombytes_negate_vartime($s)
+    {
+        static $d = null;
+        if (!$d) {
+            $d = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$d);
+        }
+
+        # fe_frombytes(h->Y,s);
+        # fe_1(h->Z);
+        $h = new ParagonIE_Sodium_Core_Curve25519_Ge_P3(
+            self::fe_0(),
+            self::fe_frombytes($s),
+            self::fe_1()
+        );
+
+        # fe_sq(u,h->Y);
+        # fe_mul(v,u,d);
+        # fe_sub(u,u,h->Z);       /* u = y^2-1 */
+        # fe_add(v,v,h->Z);       /* v = dy^2+1 */
+        $u = self::fe_sq($h->Y);
+        /** @var ParagonIE_Sodium_Core_Curve25519_Fe $d */
+        $v = self::fe_mul($u, $d);
+        $u = self::fe_sub($u, $h->Z); /* u =  y^2 - 1 */
+        $v = self::fe_add($v, $h->Z); /* v = dy^2 + 1 */
+
+        # fe_sq(v3,v);
+        # fe_mul(v3,v3,v);        /* v3 = v^3 */
+        # fe_sq(h->X,v3);
+        # fe_mul(h->X,h->X,v);
+        # fe_mul(h->X,h->X,u);    /* x = uv^7 */
+        $v3 = self::fe_sq($v);
+        $v3 = self::fe_mul($v3, $v); /* v3 = v^3 */
+        $h->X = self::fe_sq($v3);
+        $h->X = self::fe_mul($h->X, $v);
+        $h->X = self::fe_mul($h->X, $u); /* x = uv^7 */
+
+        # fe_pow22523(h->X,h->X); /* x = (uv^7)^((q-5)/8) */
+        # fe_mul(h->X,h->X,v3);
+        # fe_mul(h->X,h->X,u);    /* x = uv^3(uv^7)^((q-5)/8) */
+        $h->X = self::fe_pow22523($h->X); /* x = (uv^7)^((q-5)/8) */
+        $h->X = self::fe_mul($h->X, $v3);
+        $h->X = self::fe_mul($h->X, $u); /* x = uv^3(uv^7)^((q-5)/8) */
+
+        # fe_sq(vxx,h->X);
+        # fe_mul(vxx,vxx,v);
+        # fe_sub(check,vxx,u);    /* vx^2-u */
+        $vxx = self::fe_sq($h->X);
+        $vxx = self::fe_mul($vxx, $v);
+        $check = self::fe_sub($vxx, $u); /* vx^2 - u */
+
+        # if (fe_isnonzero(check)) {
+        #     fe_add(check,vxx,u);  /* vx^2+u */
+        #     if (fe_isnonzero(check)) {
+        #         return -1;
+        #     }
+        #     fe_mul(h->X,h->X,sqrtm1);
+        # }
+        if (self::fe_isnonzero($check)) {
+            $check = self::fe_add($vxx, $u); /* vx^2 + u */
+            if (self::fe_isnonzero($check)) {
+                throw new RangeException('Internal check failed.');
+            }
+            $h->X = self::fe_mul(
+                $h->X,
+                ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$sqrtm1)
+            );
+        }
+
+        # if (fe_isnegative(h->X) == (s[31] >> 7)) {
+        #     fe_neg(h->X,h->X);
+        # }
+        $i = self::chrToInt($s[31]);
+        if (self::fe_isnegative($h->X) === ($i >> 7)) {
+            $h->X = self::fe_neg($h->X);
+        }
+
+        # fe_mul(h->T,h->X,h->Y);
+        $h->T = self::fe_mul($h->X, $h->Y);
+        return $h;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 $R
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_Precomp $q
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P1p1
+     */
+    public static function ge_madd(
+        ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 $R,
+        ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p,
+        ParagonIE_Sodium_Core_Curve25519_Ge_Precomp $q
+    ) {
+        $r = clone $R;
+        $r->X = self::fe_add($p->Y, $p->X);
+        $r->Y = self::fe_sub($p->Y, $p->X);
+        $r->Z = self::fe_mul($r->X, $q->yplusx);
+        $r->Y = self::fe_mul($r->Y, $q->yminusx);
+        $r->T = self::fe_mul($q->xy2d, $p->T);
+        $t0 = self::fe_add(clone $p->Z, clone $p->Z);
+        $r->X = self::fe_sub($r->Z, $r->Y);
+        $r->Y = self::fe_add($r->Z, $r->Y);
+        $r->Z = self::fe_add($t0, $r->T);
+        $r->T = self::fe_sub($t0, $r->T);
+
+        return $r;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 $R
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_Precomp $q
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P1p1
+     */
+    public static function ge_msub(
+        ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 $R,
+        ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p,
+        ParagonIE_Sodium_Core_Curve25519_Ge_Precomp $q
+    ) {
+        $r = clone $R;
+
+        $r->X = self::fe_add($p->Y, $p->X);
+        $r->Y = self::fe_sub($p->Y, $p->X);
+        $r->Z = self::fe_mul($r->X, $q->yminusx);
+        $r->Y = self::fe_mul($r->Y, $q->yplusx);
+        $r->T = self::fe_mul($q->xy2d, $p->T);
+        $t0 = self::fe_add($p->Z, $p->Z);
+        $r->X = self::fe_sub($r->Z, $r->Y);
+        $r->Y = self::fe_add($r->Z, $r->Y);
+        $r->Z = self::fe_sub($t0, $r->T);
+        $r->T = self::fe_add($t0, $r->T);
+
+        return $r;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 $p
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P2
+     */
+    public static function ge_p1p1_to_p2(ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 $p)
+    {
+        $r = new ParagonIE_Sodium_Core_Curve25519_Ge_P2();
+        $r->X = self::fe_mul($p->X, $p->T);
+        $r->Y = self::fe_mul($p->Y, $p->Z);
+        $r->Z = self::fe_mul($p->Z, $p->T);
+        return $r;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 $p
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P3
+     */
+    public static function ge_p1p1_to_p3(ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 $p)
+    {
+        $r = new ParagonIE_Sodium_Core_Curve25519_Ge_P3();
+        $r->X = self::fe_mul($p->X, $p->T);
+        $r->Y = self::fe_mul($p->Y, $p->Z);
+        $r->Z = self::fe_mul($p->Z, $p->T);
+        $r->T = self::fe_mul($p->X, $p->Y);
+        return $r;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P2
+     */
+    public static function ge_p2_0()
+    {
+        return new ParagonIE_Sodium_Core_Curve25519_Ge_P2(
+            self::fe_0(),
+            self::fe_1(),
+            self::fe_1()
+        );
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P2 $p
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P1p1
+     */
+    public static function ge_p2_dbl(ParagonIE_Sodium_Core_Curve25519_Ge_P2 $p)
+    {
+        $r = new ParagonIE_Sodium_Core_Curve25519_Ge_P1p1();
+
+        $r->X = self::fe_sq($p->X);
+        $r->Z = self::fe_sq($p->Y);
+        $r->T = self::fe_sq2($p->Z);
+        $r->Y = self::fe_add($p->X, $p->Y);
+        $t0   = self::fe_sq($r->Y);
+        $r->Y = self::fe_add($r->Z, $r->X);
+        $r->Z = self::fe_sub($r->Z, $r->X);
+        $r->X = self::fe_sub($t0, $r->Y);
+        $r->T = self::fe_sub($r->T, $r->Z);
+
+        return $r;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P3
+     */
+    public static function ge_p3_0()
+    {
+        return new ParagonIE_Sodium_Core_Curve25519_Ge_P3(
+            self::fe_0(),
+            self::fe_1(),
+            self::fe_1(),
+            self::fe_0()
+        );
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_Cached
+     */
+    public static function ge_p3_to_cached(ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p)
+    {
+        static $d2 = null;
+        if ($d2 === null) {
+            $d2 = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$d2);
+        }
+        /** @var ParagonIE_Sodium_Core_Curve25519_Fe $d2 */
+        $r = new ParagonIE_Sodium_Core_Curve25519_Ge_Cached();
+        $r->YplusX = self::fe_add($p->Y, $p->X);
+        $r->YminusX = self::fe_sub($p->Y, $p->X);
+        $r->Z = self::fe_copy($p->Z);
+        $r->T2d = self::fe_mul($p->T, $d2);
+        return $r;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P2
+     */
+    public static function ge_p3_to_p2(ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p)
+    {
+        return new ParagonIE_Sodium_Core_Curve25519_Ge_P2(
+            self::fe_copy($p->X),
+            self::fe_copy($p->Y),
+            self::fe_copy($p->Z)
+        );
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $h
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function ge_p3_tobytes(ParagonIE_Sodium_Core_Curve25519_Ge_P3 $h)
+    {
+        $recip = self::fe_invert($h->Z);
+        $x = self::fe_mul($h->X, $recip);
+        $y = self::fe_mul($h->Y, $recip);
+        $s = self::fe_tobytes($y);
+        $s[31] = self::intToChr(
+            self::chrToInt($s[31]) ^ (self::fe_isnegative($x) << 7)
+        );
+        return $s;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P1p1
+     */
+    public static function ge_p3_dbl(ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p)
+    {
+        $q = self::ge_p3_to_p2($p);
+        return self::ge_p2_dbl($q);
+    }
+
+    /**
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_Precomp
+     */
+    public static function ge_precomp_0()
+    {
+        return new ParagonIE_Sodium_Core_Curve25519_Ge_Precomp(
+            self::fe_1(),
+            self::fe_1(),
+            self::fe_0()
+        );
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param int $b
+     * @param int $c
+     * @return int
+     */
+    public static function equal($b, $c)
+    {
+        return (int) ((($b ^ $c) - 1) >> 31) & 1;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param int|string $char
+     * @return int (1 = yes, 0 = no)
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function negative($char)
+    {
+        if (is_int($char)) {
+            return ($char >> 63) & 1;
+        }
+        $x = self::chrToInt(self::substr($char, 0, 1));
+        return (int) ($x >> 63);
+    }
+
+    /**
+     * Conditional move
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_Precomp $t
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_Precomp $u
+     * @param int $b
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_Precomp
+     */
+    public static function cmov(
+        ParagonIE_Sodium_Core_Curve25519_Ge_Precomp $t,
+        ParagonIE_Sodium_Core_Curve25519_Ge_Precomp $u,
+        $b
+    ) {
+        if (!is_int($b)) {
+            throw new InvalidArgumentException('Expected an integer.');
+        }
+        return new ParagonIE_Sodium_Core_Curve25519_Ge_Precomp(
+            self::fe_cmov($t->yplusx,  $u->yplusx,  $b),
+            self::fe_cmov($t->yminusx, $u->yminusx, $b),
+            self::fe_cmov($t->xy2d,    $u->xy2d,    $b)
+        );
+    }
+
+    /**
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_Cached $t
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_Cached $u
+     * @param int $b
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_Cached
+     */
+    public static function ge_cmov_cached(
+        ParagonIE_Sodium_Core_Curve25519_Ge_Cached $t,
+        ParagonIE_Sodium_Core_Curve25519_Ge_Cached $u,
+        $b
+    ) {
+        $b &= 1;
+        $ret = new ParagonIE_Sodium_Core_Curve25519_Ge_Cached();
+        $ret->YplusX  = self::fe_cmov($t->YplusX,  $u->YplusX,  $b);
+        $ret->YminusX = self::fe_cmov($t->YminusX, $u->YminusX, $b);
+        $ret->Z       = self::fe_cmov($t->Z,       $u->Z,       $b);
+        $ret->T2d     = self::fe_cmov($t->T2d,     $u->T2d,     $b);
+        return $ret;
+    }
+
+    /**
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_Cached[] $cached
+     * @param int $b
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_Cached
+     * @throws SodiumException
+     */
+    public static function ge_cmov8_cached(array $cached, $b)
+    {
+        // const unsigned char bnegative = negative(b);
+        // const unsigned char babs      = b - (((-bnegative) & b) * ((signed char) 1 << 1));
+        $bnegative = self::negative($b);
+        $babs = $b - (((-$bnegative) & $b) << 1);
+
+        // ge25519_cached_0(t);
+        $t = new ParagonIE_Sodium_Core_Curve25519_Ge_Cached(
+            self::fe_1(),
+            self::fe_1(),
+            self::fe_1(),
+            self::fe_0()
+        );
+
+        // ge25519_cmov_cached(t, &cached[0], equal(babs, 1));
+        // ge25519_cmov_cached(t, &cached[1], equal(babs, 2));
+        // ge25519_cmov_cached(t, &cached[2], equal(babs, 3));
+        // ge25519_cmov_cached(t, &cached[3], equal(babs, 4));
+        // ge25519_cmov_cached(t, &cached[4], equal(babs, 5));
+        // ge25519_cmov_cached(t, &cached[5], equal(babs, 6));
+        // ge25519_cmov_cached(t, &cached[6], equal(babs, 7));
+        // ge25519_cmov_cached(t, &cached[7], equal(babs, 8));
+        for ($x = 0; $x < 8; ++$x) {
+            $t = self::ge_cmov_cached($t, $cached[$x], self::equal($babs, $x + 1));
+        }
+
+        // fe25519_copy(minust.YplusX, t->YminusX);
+        // fe25519_copy(minust.YminusX, t->YplusX);
+        // fe25519_copy(minust.Z, t->Z);
+        // fe25519_neg(minust.T2d, t->T2d);
+        $minust = new ParagonIE_Sodium_Core_Curve25519_Ge_Cached(
+            self::fe_copy($t->YminusX),
+            self::fe_copy($t->YplusX),
+            self::fe_copy($t->Z),
+            self::fe_neg($t->T2d)
+        );
+        return self::ge_cmov_cached($t, $minust, $bnegative);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param int $pos
+     * @param int $b
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_Precomp
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     * @psalm-suppress MixedArrayAccess
+     * @psalm-suppress MixedArrayOffset
+     */
+    public static function ge_select($pos = 0, $b = 0)
+    {
+        static $base = null;
+        if ($base === null) {
+            $base = array();
+            /** @var int $i */
+            foreach (self::$base as $i => $bas) {
+                for ($j = 0; $j < 8; ++$j) {
+                    $base[$i][$j] = new ParagonIE_Sodium_Core_Curve25519_Ge_Precomp(
+                        ParagonIE_Sodium_Core_Curve25519_Fe::fromArray($bas[$j][0]),
+                        ParagonIE_Sodium_Core_Curve25519_Fe::fromArray($bas[$j][1]),
+                        ParagonIE_Sodium_Core_Curve25519_Fe::fromArray($bas[$j][2])
+                    );
+                }
+            }
+        }
+        /** @var array<int, array<int, ParagonIE_Sodium_Core_Curve25519_Ge_Precomp>> $base */
+        if (!is_int($pos)) {
+            throw new InvalidArgumentException('Position must be an integer');
+        }
+        if ($pos < 0 || $pos > 31) {
+            throw new RangeException('Position is out of range [0, 31]');
+        }
+
+        /** @var int $bnegative */
+        $bnegative = self::negative($b);
+        /** @var int $babs */
+        $babs = $b - (((-$bnegative) & $b) << 1);
+
+        $t = self::ge_precomp_0();
+        for ($i = 0; $i < 8; ++$i) {
+            $t = self::cmov(
+                $t,
+                $base[$pos][$i],
+                self::equal($babs, $i + 1)
+            );
+        }
+        $minusT = new ParagonIE_Sodium_Core_Curve25519_Ge_Precomp(
+            self::fe_copy($t->yminusx),
+            self::fe_copy($t->yplusx),
+            self::fe_neg($t->xy2d)
+        );
+        return self::cmov($t, $minusT, $bnegative);
+    }
+
+    /**
+     * Subtract two group elements.
+     *
+     * r = p - q
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_Cached $q
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P1p1
+     */
+    public static function ge_sub(
+        ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p,
+        ParagonIE_Sodium_Core_Curve25519_Ge_Cached $q
+    ) {
+        $r = new ParagonIE_Sodium_Core_Curve25519_Ge_P1p1();
+
+        $r->X = self::fe_add($p->Y, $p->X);
+        $r->Y = self::fe_sub($p->Y, $p->X);
+        $r->Z = self::fe_mul($r->X, $q->YminusX);
+        $r->Y = self::fe_mul($r->Y, $q->YplusX);
+        $r->T = self::fe_mul($q->T2d, $p->T);
+        $r->X = self::fe_mul($p->Z, $q->Z);
+        $t0 = self::fe_add($r->X, $r->X);
+        $r->X = self::fe_sub($r->Z, $r->Y);
+        $r->Y = self::fe_add($r->Z, $r->Y);
+        $r->Z = self::fe_sub($t0, $r->T);
+        $r->T = self::fe_add($t0, $r->T);
+
+        return $r;
+    }
+
+    /**
+     * Convert a group element to a byte string.
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P2 $h
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function ge_tobytes(ParagonIE_Sodium_Core_Curve25519_Ge_P2 $h)
+    {
+        $recip = self::fe_invert($h->Z);
+        $x = self::fe_mul($h->X, $recip);
+        $y = self::fe_mul($h->Y, $recip);
+        $s = self::fe_tobytes($y);
+        $s[31] = self::intToChr(
+            self::chrToInt($s[31]) ^ (self::fe_isnegative($x) << 7)
+        );
+        return $s;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $a
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $A
+     * @param string $b
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P2
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     * @psalm-suppress MixedArrayAccess
+     */
+    public static function ge_double_scalarmult_vartime(
+        $a,
+        ParagonIE_Sodium_Core_Curve25519_Ge_P3 $A,
+        $b
+    ) {
+        /** @var array<int, ParagonIE_Sodium_Core_Curve25519_Ge_Cached> $Ai */
+        $Ai = array();
+
+        /** @var array<int, ParagonIE_Sodium_Core_Curve25519_Ge_Precomp> $Bi */
+        static $Bi = array();
+        if (!$Bi) {
+            for ($i = 0; $i < 8; ++$i) {
+                $Bi[$i] = new ParagonIE_Sodium_Core_Curve25519_Ge_Precomp(
+                    ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$base2[$i][0]),
+                    ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$base2[$i][1]),
+                    ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$base2[$i][2])
+                );
+            }
+        }
+        for ($i = 0; $i < 8; ++$i) {
+            $Ai[$i] = new ParagonIE_Sodium_Core_Curve25519_Ge_Cached(
+                self::fe_0(),
+                self::fe_0(),
+                self::fe_0(),
+                self::fe_0()
+            );
+        }
+
+        # slide(aslide,a);
+        # slide(bslide,b);
+        /** @var array<int, int> $aslide */
+        $aslide = self::slide($a);
+        /** @var array<int, int> $bslide */
+        $bslide = self::slide($b);
+
+        # ge_p3_to_cached(&Ai[0],A);
+        # ge_p3_dbl(&t,A); ge_p1p1_to_p3(&A2,&t);
+        $Ai[0] = self::ge_p3_to_cached($A);
+        $t = self::ge_p3_dbl($A);
+        $A2 = self::ge_p1p1_to_p3($t);
+
+        # ge_add(&t,&A2,&Ai[0]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[1],&u);
+        # ge_add(&t,&A2,&Ai[1]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[2],&u);
+        # ge_add(&t,&A2,&Ai[2]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[3],&u);
+        # ge_add(&t,&A2,&Ai[3]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[4],&u);
+        # ge_add(&t,&A2,&Ai[4]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[5],&u);
+        # ge_add(&t,&A2,&Ai[5]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[6],&u);
+        # ge_add(&t,&A2,&Ai[6]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[7],&u);
+        for ($i = 0; $i < 7; ++$i) {
+            $t = self::ge_add($A2, $Ai[$i]);
+            $u = self::ge_p1p1_to_p3($t);
+            $Ai[$i + 1] = self::ge_p3_to_cached($u);
+        }
+
+        # ge_p2_0(r);
+        $r = self::ge_p2_0();
+
+        # for (i = 255;i >= 0;--i) {
+        #     if (aslide[i] || bslide[i]) break;
+        # }
+        $i = 255;
+        for (; $i >= 0; --$i) {
+            if ($aslide[$i] || $bslide[$i]) {
+                break;
+            }
+        }
+
+        # for (;i >= 0;--i) {
+        for (; $i >= 0; --$i) {
+            # ge_p2_dbl(&t,r);
+            $t = self::ge_p2_dbl($r);
+
+            # if (aslide[i] > 0) {
+            if ($aslide[$i] > 0) {
+                # ge_p1p1_to_p3(&u,&t);
+                # ge_add(&t,&u,&Ai[aslide[i]/2]);
+                $u = self::ge_p1p1_to_p3($t);
+                $t = self::ge_add(
+                    $u,
+                    $Ai[(int) floor($aslide[$i] / 2)]
+                );
+            # } else if (aslide[i] < 0) {
+            } elseif ($aslide[$i] < 0) {
+                # ge_p1p1_to_p3(&u,&t);
+                # ge_sub(&t,&u,&Ai[(-aslide[i])/2]);
+                $u = self::ge_p1p1_to_p3($t);
+                $t = self::ge_sub(
+                    $u,
+                    $Ai[(int) floor(-$aslide[$i] / 2)]
+                );
+            }
+
+            # if (bslide[i] > 0) {
+            if ($bslide[$i] > 0) {
+                /** @var int $index */
+                $index = (int) floor($bslide[$i] / 2);
+                # ge_p1p1_to_p3(&u,&t);
+                # ge_madd(&t,&u,&Bi[bslide[i]/2]);
+                $u = self::ge_p1p1_to_p3($t);
+                $t = self::ge_madd($t, $u, $Bi[$index]);
+            # } else if (bslide[i] < 0) {
+            } elseif ($bslide[$i] < 0) {
+                /** @var int $index */
+                $index = (int) floor(-$bslide[$i] / 2);
+                # ge_p1p1_to_p3(&u,&t);
+                # ge_msub(&t,&u,&Bi[(-bslide[i])/2]);
+                $u = self::ge_p1p1_to_p3($t);
+                $t = self::ge_msub($t, $u, $Bi[$index]);
+            }
+            # ge_p1p1_to_p2(r,&t);
+            $r = self::ge_p1p1_to_p2($t);
+        }
+        return $r;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $a
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P3
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedAssignment
+     * @psalm-suppress MixedOperand
+     */
+    public static function ge_scalarmult($a, $p)
+    {
+        $e = array_fill(0, 64, 0);
+
+        /** @var ParagonIE_Sodium_Core_Curve25519_Ge_Cached[] $pi */
+        $pi = array();
+
+        //        ge25519_p3_to_cached(&pi[1 - 1], p);   /* p */
+        $pi[0] = self::ge_p3_to_cached($p);
+
+        //        ge25519_p3_dbl(&t2, p);
+        //        ge25519_p1p1_to_p3(&p2, &t2);
+        //        ge25519_p3_to_cached(&pi[2 - 1], &p2); /* 2p = 2*p */
+        $t2 = self::ge_p3_dbl($p);
+        $p2 = self::ge_p1p1_to_p3($t2);
+        $pi[1] = self::ge_p3_to_cached($p2);
+
+        //        ge25519_add_cached(&t3, p, &pi[2 - 1]);
+        //        ge25519_p1p1_to_p3(&p3, &t3);
+        //        ge25519_p3_to_cached(&pi[3 - 1], &p3); /* 3p = 2p+p */
+        $t3 = self::ge_add($p, $pi[1]);
+        $p3 = self::ge_p1p1_to_p3($t3);
+        $pi[2] = self::ge_p3_to_cached($p3);
+
+        //        ge25519_p3_dbl(&t4, &p2);
+        //        ge25519_p1p1_to_p3(&p4, &t4);
+        //        ge25519_p3_to_cached(&pi[4 - 1], &p4); /* 4p = 2*2p */
+        $t4 = self::ge_p3_dbl($p2);
+        $p4 = self::ge_p1p1_to_p3($t4);
+        $pi[3] = self::ge_p3_to_cached($p4);
+
+        //        ge25519_add_cached(&t5, p, &pi[4 - 1]);
+        //        ge25519_p1p1_to_p3(&p5, &t5);
+        //        ge25519_p3_to_cached(&pi[5 - 1], &p5); /* 5p = 4p+p */
+        $t5 = self::ge_add($p, $pi[3]);
+        $p5 = self::ge_p1p1_to_p3($t5);
+        $pi[4] = self::ge_p3_to_cached($p5);
+
+        //        ge25519_p3_dbl(&t6, &p3);
+        //        ge25519_p1p1_to_p3(&p6, &t6);
+        //        ge25519_p3_to_cached(&pi[6 - 1], &p6); /* 6p = 2*3p */
+        $t6 = self::ge_p3_dbl($p3);
+        $p6 = self::ge_p1p1_to_p3($t6);
+        $pi[5] = self::ge_p3_to_cached($p6);
+
+        //        ge25519_add_cached(&t7, p, &pi[6 - 1]);
+        //        ge25519_p1p1_to_p3(&p7, &t7);
+        //        ge25519_p3_to_cached(&pi[7 - 1], &p7); /* 7p = 6p+p */
+        $t7 = self::ge_add($p, $pi[5]);
+        $p7 = self::ge_p1p1_to_p3($t7);
+        $pi[6] = self::ge_p3_to_cached($p7);
+
+        //        ge25519_p3_dbl(&t8, &p4);
+        //        ge25519_p1p1_to_p3(&p8, &t8);
+        //        ge25519_p3_to_cached(&pi[8 - 1], &p8); /* 8p = 2*4p */
+        $t8 = self::ge_p3_dbl($p4);
+        $p8 = self::ge_p1p1_to_p3($t8);
+        $pi[7] = self::ge_p3_to_cached($p8);
+
+
+        //        for (i = 0; i < 32; ++i) {
+        //            e[2 * i + 0] = (a[i] >> 0) & 15;
+        //            e[2 * i + 1] = (a[i] >> 4) & 15;
+        //        }
+        for ($i = 0; $i < 32; ++$i) {
+            $e[($i << 1)    ] =  self::chrToInt($a[$i]) & 15;
+            $e[($i << 1) + 1] = (self::chrToInt($a[$i]) >> 4) & 15;
+        }
+        //        /* each e[i] is between 0 and 15 */
+        //        /* e[63] is between 0 and 7 */
+
+        //        carry = 0;
+        //        for (i = 0; i < 63; ++i) {
+        //            e[i] += carry;
+        //            carry = e[i] + 8;
+        //            carry >>= 4;
+        //            e[i] -= carry * ((signed char) 1 << 4);
+        //        }
+        $carry = 0;
+        for ($i = 0; $i < 64; ++$i) {
+            $e[$i] += $carry;
+            $carry = $e[$i] + 8;
+            $carry >>= 4;
+            $e[$i] -= $carry << 4;
+        }
+        //        e[63] += carry;
+        //        /* each e[i] is between -8 and 8 */
+        $e[63] += $carry;
+
+        //        ge25519_p3_0(h);
+        $h = self::ge_p3_0();
+
+        //        for (i = 63; i != 0; i--) {
+        for ($i = 63; $i != 0; --$i) {
+            // ge25519_cmov8_cached(&t, pi, e[i]);
+            $t = self::ge_cmov8_cached($pi, $e[$i]);
+            // ge25519_add_cached(&r, h, &t);
+            $r = self::ge_add($h, $t);
+
+            // ge25519_p1p1_to_p2(&s, &r);
+            // ge25519_p2_dbl(&r, &s);
+            // ge25519_p1p1_to_p2(&s, &r);
+            // ge25519_p2_dbl(&r, &s);
+            // ge25519_p1p1_to_p2(&s, &r);
+            // ge25519_p2_dbl(&r, &s);
+            // ge25519_p1p1_to_p2(&s, &r);
+            // ge25519_p2_dbl(&r, &s);
+            $s = self::ge_p1p1_to_p2($r);
+            $r = self::ge_p2_dbl($s);
+            $s = self::ge_p1p1_to_p2($r);
+            $r = self::ge_p2_dbl($s);
+            $s = self::ge_p1p1_to_p2($r);
+            $r = self::ge_p2_dbl($s);
+            $s = self::ge_p1p1_to_p2($r);
+            $r = self::ge_p2_dbl($s);
+
+            // ge25519_p1p1_to_p3(h, &r);  /* *16 */
+            $h = self::ge_p1p1_to_p3($r); /* *16 */
+        }
+
+        //        ge25519_cmov8_cached(&t, pi, e[i]);
+        //        ge25519_add_cached(&r, h, &t);
+        //        ge25519_p1p1_to_p3(h, &r);
+        $t = self::ge_cmov8_cached($pi, $e[0]);
+        $r = self::ge_add($h, $t);
+        return self::ge_p1p1_to_p3($r);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $a
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P3
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedAssignment
+     * @psalm-suppress MixedOperand
+     */
+    public static function ge_scalarmult_base($a)
+    {
+        /** @var array<int, int> $e */
+        $e = array();
+        $r = new ParagonIE_Sodium_Core_Curve25519_Ge_P1p1();
+
+        for ($i = 0; $i < 32; ++$i) {
+            /** @var int $dbl */
+            $dbl = (int) $i << 1;
+            $e[$dbl] = (int) self::chrToInt($a[$i]) & 15;
+            $e[$dbl + 1] = (int) (self::chrToInt($a[$i]) >> 4) & 15;
+        }
+
+        /** @var int $carry */
+        $carry = 0;
+        for ($i = 0; $i < 63; ++$i) {
+            $e[$i] += $carry;
+            /** @var int $carry */
+            $carry = $e[$i] + 8;
+            /** @var int $carry */
+            $carry >>= 4;
+            $e[$i] -= $carry << 4;
+        }
+        /** @var array<int, int> $e */
+        $e[63] += (int) $carry;
+
+        $h = self::ge_p3_0();
+
+        for ($i = 1; $i < 64; $i += 2) {
+            $t = self::ge_select((int) floor($i / 2), (int) $e[$i]);
+            $r = self::ge_madd($r, $h, $t);
+            $h = self::ge_p1p1_to_p3($r);
+        }
+
+        $r = self::ge_p3_dbl($h);
+
+        $s = self::ge_p1p1_to_p2($r);
+        $r = self::ge_p2_dbl($s);
+        $s = self::ge_p1p1_to_p2($r);
+        $r = self::ge_p2_dbl($s);
+        $s = self::ge_p1p1_to_p2($r);
+        $r = self::ge_p2_dbl($s);
+
+        $h = self::ge_p1p1_to_p3($r);
+
+        for ($i = 0; $i < 64; $i += 2) {
+            $t = self::ge_select($i >> 1, (int) $e[$i]);
+            $r = self::ge_madd($r, $h, $t);
+            $h = self::ge_p1p1_to_p3($r);
+        }
+        return $h;
+    }
+
+    /**
+     * Calculates (ab + c) mod l
+     * where l = 2^252 + 27742317777372353535851937790883648493
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $a
+     * @param string $b
+     * @param string $c
+     * @return string
+     * @throws TypeError
+     */
+    public static function sc_muladd($a, $b, $c)
+    {
+        /** @var int $a0 */
+        $a0 = 2097151 & self::load_3(self::substr($a, 0, 3));
+        /** @var int $a1 */
+        $a1 = 2097151 & (self::load_4(self::substr($a, 2, 4)) >> 5);
+        /** @var int $a2 */
+        $a2 = 2097151 & (self::load_3(self::substr($a, 5, 3)) >> 2);
+        /** @var int $a3 */
+        $a3 = 2097151 & (self::load_4(self::substr($a, 7, 4)) >> 7);
+        /** @var int $a4 */
+        $a4 = 2097151 & (self::load_4(self::substr($a, 10, 4)) >> 4);
+        /** @var int $a5 */
+        $a5 = 2097151 & (self::load_3(self::substr($a, 13, 3)) >> 1);
+        /** @var int $a6 */
+        $a6 = 2097151 & (self::load_4(self::substr($a, 15, 4)) >> 6);
+        /** @var int $a7 */
+        $a7 = 2097151 & (self::load_3(self::substr($a, 18, 3)) >> 3);
+        /** @var int $a8 */
+        $a8 = 2097151 & self::load_3(self::substr($a, 21, 3));
+        /** @var int $a9 */
+        $a9 = 2097151 & (self::load_4(self::substr($a, 23, 4)) >> 5);
+        /** @var int $a10 */
+        $a10 = 2097151 & (self::load_3(self::substr($a, 26, 3)) >> 2);
+        /** @var int $a11 */
+        $a11 = (self::load_4(self::substr($a, 28, 4)) >> 7);
+
+        /** @var int $b0 */
+        $b0 = 2097151 & self::load_3(self::substr($b, 0, 3));
+        /** @var int $b1 */
+        $b1 = 2097151 & (self::load_4(self::substr($b, 2, 4)) >> 5);
+        /** @var int $b2 */
+        $b2 = 2097151 & (self::load_3(self::substr($b, 5, 3)) >> 2);
+        /** @var int $b3 */
+        $b3 = 2097151 & (self::load_4(self::substr($b, 7, 4)) >> 7);
+        /** @var int $b4 */
+        $b4 = 2097151 & (self::load_4(self::substr($b, 10, 4)) >> 4);
+        /** @var int $b5 */
+        $b5 = 2097151 & (self::load_3(self::substr($b, 13, 3)) >> 1);
+        /** @var int $b6 */
+        $b6 = 2097151 & (self::load_4(self::substr($b, 15, 4)) >> 6);
+        /** @var int $b7 */
+        $b7 = 2097151 & (self::load_3(self::substr($b, 18, 3)) >> 3);
+        /** @var int $b8 */
+        $b8 = 2097151 & self::load_3(self::substr($b, 21, 3));
+        /** @var int $b9 */
+        $b9 = 2097151 & (self::load_4(self::substr($b, 23, 4)) >> 5);
+        /** @var int $b10 */
+        $b10 = 2097151 & (self::load_3(self::substr($b, 26, 3)) >> 2);
+        /** @var int $b11 */
+        $b11 = (self::load_4(self::substr($b, 28, 4)) >> 7);
+
+        /** @var int $c0 */
+        $c0 = 2097151 & self::load_3(self::substr($c, 0, 3));
+        /** @var int $c1 */
+        $c1 = 2097151 & (self::load_4(self::substr($c, 2, 4)) >> 5);
+        /** @var int $c2 */
+        $c2 = 2097151 & (self::load_3(self::substr($c, 5, 3)) >> 2);
+        /** @var int $c3 */
+        $c3 = 2097151 & (self::load_4(self::substr($c, 7, 4)) >> 7);
+        /** @var int $c4 */
+        $c4 = 2097151 & (self::load_4(self::substr($c, 10, 4)) >> 4);
+        /** @var int $c5 */
+        $c5 = 2097151 & (self::load_3(self::substr($c, 13, 3)) >> 1);
+        /** @var int $c6 */
+        $c6 = 2097151 & (self::load_4(self::substr($c, 15, 4)) >> 6);
+        /** @var int $c7 */
+        $c7 = 2097151 & (self::load_3(self::substr($c, 18, 3)) >> 3);
+        /** @var int $c8 */
+        $c8 = 2097151 & self::load_3(self::substr($c, 21, 3));
+        /** @var int $c9 */
+        $c9 = 2097151 & (self::load_4(self::substr($c, 23, 4)) >> 5);
+        /** @var int $c10 */
+        $c10 = 2097151 & (self::load_3(self::substr($c, 26, 3)) >> 2);
+        /** @var int $c11 */
+        $c11 = (self::load_4(self::substr($c, 28, 4)) >> 7);
+
+        /* Can't really avoid the pyramid here: */
+        $s0 = $c0 + self::mul($a0, $b0, 24);
+        $s1 = $c1 + self::mul($a0, $b1, 24) + self::mul($a1, $b0, 24);
+        $s2 = $c2 + self::mul($a0, $b2, 24) + self::mul($a1, $b1, 24) + self::mul($a2, $b0, 24);
+        $s3 = $c3 + self::mul($a0, $b3, 24) + self::mul($a1, $b2, 24) + self::mul($a2, $b1, 24) + self::mul($a3, $b0, 24);
+        $s4 = $c4 + self::mul($a0, $b4, 24) + self::mul($a1, $b3, 24) + self::mul($a2, $b2, 24) + self::mul($a3, $b1, 24) +
+               self::mul($a4, $b0, 24);
+        $s5 = $c5 + self::mul($a0, $b5, 24) + self::mul($a1, $b4, 24) + self::mul($a2, $b3, 24) + self::mul($a3, $b2, 24) +
+               self::mul($a4, $b1, 24) + self::mul($a5, $b0, 24);
+        $s6 = $c6 + self::mul($a0, $b6, 24) + self::mul($a1, $b5, 24) + self::mul($a2, $b4, 24) + self::mul($a3, $b3, 24) +
+               self::mul($a4, $b2, 24) + self::mul($a5, $b1, 24) + self::mul($a6, $b0, 24);
+        $s7 = $c7 + self::mul($a0, $b7, 24) + self::mul($a1, $b6, 24) + self::mul($a2, $b5, 24) + self::mul($a3, $b4, 24) +
+               self::mul($a4, $b3, 24) + self::mul($a5, $b2, 24) + self::mul($a6, $b1, 24) + self::mul($a7, $b0, 24);
+        $s8 = $c8 + self::mul($a0, $b8, 24) + self::mul($a1, $b7, 24) + self::mul($a2, $b6, 24) + self::mul($a3, $b5, 24) +
+               self::mul($a4, $b4, 24) + self::mul($a5, $b3, 24) + self::mul($a6, $b2, 24) + self::mul($a7, $b1, 24) +
+               self::mul($a8, $b0, 24);
+        $s9 = $c9 + self::mul($a0, $b9, 24) + self::mul($a1, $b8, 24) + self::mul($a2, $b7, 24) + self::mul($a3, $b6, 24) +
+               self::mul($a4, $b5, 24) + self::mul($a5, $b4, 24) + self::mul($a6, $b3, 24) + self::mul($a7, $b2, 24) +
+               self::mul($a8, $b1, 24) + self::mul($a9, $b0, 24);
+        $s10 = $c10 + self::mul($a0, $b10, 24) + self::mul($a1, $b9, 24) + self::mul($a2, $b8, 24) + self::mul($a3, $b7, 24) +
+               self::mul($a4, $b6, 24) + self::mul($a5, $b5, 24) + self::mul($a6, $b4, 24) + self::mul($a7, $b3, 24) +
+               self::mul($a8, $b2, 24) + self::mul($a9, $b1, 24) + self::mul($a10, $b0, 24);
+        $s11 = $c11 + self::mul($a0, $b11, 24) + self::mul($a1, $b10, 24) + self::mul($a2, $b9, 24) + self::mul($a3, $b8, 24) +
+               self::mul($a4, $b7, 24) + self::mul($a5, $b6, 24) + self::mul($a6, $b5, 24) + self::mul($a7, $b4, 24) +
+               self::mul($a8, $b3, 24) + self::mul($a9, $b2, 24) + self::mul($a10, $b1, 24) + self::mul($a11, $b0, 24);
+        $s12 = self::mul($a1, $b11, 24) + self::mul($a2, $b10, 24) + self::mul($a3, $b9, 24) + self::mul($a4, $b8, 24) +
+               self::mul($a5, $b7, 24) + self::mul($a6, $b6, 24) + self::mul($a7, $b5, 24) + self::mul($a8, $b4, 24) +
+               self::mul($a9, $b3, 24) + self::mul($a10, $b2, 24) + self::mul($a11, $b1, 24);
+        $s13 = self::mul($a2, $b11, 24) + self::mul($a3, $b10, 24) + self::mul($a4, $b9, 24) + self::mul($a5, $b8, 24) +
+               self::mul($a6, $b7, 24) + self::mul($a7, $b6, 24) + self::mul($a8, $b5, 24) + self::mul($a9, $b4, 24) +
+               self::mul($a10, $b3, 24) + self::mul($a11, $b2, 24);
+        $s14 = self::mul($a3, $b11, 24) + self::mul($a4, $b10, 24) + self::mul($a5, $b9, 24) + self::mul($a6, $b8, 24) +
+               self::mul($a7, $b7, 24) + self::mul($a8, $b6, 24) + self::mul($a9, $b5, 24) + self::mul($a10, $b4, 24) +
+               self::mul($a11, $b3, 24);
+        $s15 = self::mul($a4, $b11, 24) + self::mul($a5, $b10, 24) + self::mul($a6, $b9, 24) + self::mul($a7, $b8, 24) +
+               self::mul($a8, $b7, 24) + self::mul($a9, $b6, 24) + self::mul($a10, $b5, 24) + self::mul($a11, $b4, 24);
+        $s16 = self::mul($a5, $b11, 24) + self::mul($a6, $b10, 24) + self::mul($a7, $b9, 24) + self::mul($a8, $b8, 24) +
+               self::mul($a9, $b7, 24) + self::mul($a10, $b6, 24) + self::mul($a11, $b5, 24);
+        $s17 = self::mul($a6, $b11, 24) + self::mul($a7, $b10, 24) + self::mul($a8, $b9, 24) + self::mul($a9, $b8, 24) +
+               self::mul($a10, $b7, 24) + self::mul($a11, $b6, 24);
+        $s18 = self::mul($a7, $b11, 24) + self::mul($a8, $b10, 24) + self::mul($a9, $b9, 24) + self::mul($a10, $b8, 24) +
+               self::mul($a11, $b7, 24);
+        $s19 = self::mul($a8, $b11, 24) + self::mul($a9, $b10, 24) + self::mul($a10, $b9, 24) + self::mul($a11, $b8, 24);
+        $s20 = self::mul($a9, $b11, 24) + self::mul($a10, $b10, 24) + self::mul($a11, $b9, 24);
+        $s21 = self::mul($a10, $b11, 24) + self::mul($a11, $b10, 24);
+        $s22 = self::mul($a11, $b11, 24);
+        $s23 = 0;
+
+        /** @var int $carry0 */
+        $carry0 = ($s0 + (1 << 20)) >> 21;
+        $s1 += $carry0;
+        $s0 -= $carry0 << 21;
+        /** @var int $carry2 */
+        $carry2 = ($s2 + (1 << 20)) >> 21;
+        $s3 += $carry2;
+        $s2 -= $carry2 << 21;
+        /** @var int $carry4 */
+        $carry4 = ($s4 + (1 << 20)) >> 21;
+        $s5 += $carry4;
+        $s4 -= $carry4 << 21;
+        /** @var int $carry6 */
+        $carry6 = ($s6 + (1 << 20)) >> 21;
+        $s7 += $carry6;
+        $s6 -= $carry6 << 21;
+        /** @var int $carry8 */
+        $carry8 = ($s8 + (1 << 20)) >> 21;
+        $s9 += $carry8;
+        $s8 -= $carry8 << 21;
+        /** @var int $carry10 */
+        $carry10 = ($s10 + (1 << 20)) >> 21;
+        $s11 += $carry10;
+        $s10 -= $carry10 << 21;
+        /** @var int $carry12 */
+        $carry12 = ($s12 + (1 << 20)) >> 21;
+        $s13 += $carry12;
+        $s12 -= $carry12 << 21;
+        /** @var int $carry14 */
+        $carry14 = ($s14 + (1 << 20)) >> 21;
+        $s15 += $carry14;
+        $s14 -= $carry14 << 21;
+        /** @var int $carry16 */
+        $carry16 = ($s16 + (1 << 20)) >> 21;
+        $s17 += $carry16;
+        $s16 -= $carry16 << 21;
+        /** @var int $carry18 */
+        $carry18 = ($s18 + (1 << 20)) >> 21;
+        $s19 += $carry18;
+        $s18 -= $carry18 << 21;
+        /** @var int $carry20 */
+        $carry20 = ($s20 + (1 << 20)) >> 21;
+        $s21 += $carry20;
+        $s20 -= $carry20 << 21;
+        /** @var int $carry22 */
+        $carry22 = ($s22 + (1 << 20)) >> 21;
+        $s23 += $carry22;
+        $s22 -= $carry22 << 21;
+
+        /** @var int $carry1 */
+        $carry1 = ($s1 + (1 << 20)) >> 21;
+        $s2 += $carry1;
+        $s1 -= $carry1 << 21;
+        /** @var int $carry3 */
+        $carry3 = ($s3 + (1 << 20)) >> 21;
+        $s4 += $carry3;
+        $s3 -= $carry3 << 21;
+        /** @var int $carry5 */
+        $carry5 = ($s5 + (1 << 20)) >> 21;
+        $s6 += $carry5;
+        $s5 -= $carry5 << 21;
+        /** @var int $carry7 */
+        $carry7 = ($s7 + (1 << 20)) >> 21;
+        $s8 += $carry7;
+        $s7 -= $carry7 << 21;
+        /** @var int $carry9 */
+        $carry9 = ($s9 + (1 << 20)) >> 21;
+        $s10 += $carry9;
+        $s9 -= $carry9 << 21;
+        /** @var int $carry11 */
+        $carry11 = ($s11 + (1 << 20)) >> 21;
+        $s12 += $carry11;
+        $s11 -= $carry11 << 21;
+        /** @var int $carry13 */
+        $carry13 = ($s13 + (1 << 20)) >> 21;
+        $s14 += $carry13;
+        $s13 -= $carry13 << 21;
+        /** @var int $carry15 */
+        $carry15 = ($s15 + (1 << 20)) >> 21;
+        $s16 += $carry15;
+        $s15 -= $carry15 << 21;
+        /** @var int $carry17 */
+        $carry17 = ($s17 + (1 << 20)) >> 21;
+        $s18 += $carry17;
+        $s17 -= $carry17 << 21;
+        /** @var int $carry19 */
+        $carry19 = ($s19 + (1 << 20)) >> 21;
+        $s20 += $carry19;
+        $s19 -= $carry19 << 21;
+        /** @var int $carry21 */
+        $carry21 = ($s21 + (1 << 20)) >> 21;
+        $s22 += $carry21;
+        $s21 -= $carry21 << 21;
+
+        $s11 += self::mul($s23, 666643, 20);
+        $s12 += self::mul($s23, 470296, 19);
+        $s13 += self::mul($s23, 654183, 20);
+        $s14 -= self::mul($s23, 997805, 20);
+        $s15 += self::mul($s23, 136657, 18);
+        $s16 -= self::mul($s23, 683901, 20);
+
+        $s10 += self::mul($s22, 666643, 20);
+        $s11 += self::mul($s22, 470296, 19);
+        $s12 += self::mul($s22, 654183, 20);
+        $s13 -= self::mul($s22, 997805, 20);
+        $s14 += self::mul($s22, 136657, 18);
+        $s15 -= self::mul($s22, 683901, 20);
+
+        $s9  += self::mul($s21,  666643, 20);
+        $s10 += self::mul($s21,  470296, 19);
+        $s11 += self::mul($s21,  654183, 20);
+        $s12 -= self::mul($s21,  997805, 20);
+        $s13 += self::mul($s21,  136657, 18);
+        $s14 -= self::mul($s21,  683901, 20);
+
+        $s8  += self::mul($s20,  666643, 20);
+        $s9  += self::mul($s20,  470296, 19);
+        $s10 += self::mul($s20,  654183, 20);
+        $s11 -= self::mul($s20,  997805, 20);
+        $s12 += self::mul($s20,  136657, 18);
+        $s13 -= self::mul($s20,  683901, 20);
+
+        $s7  += self::mul($s19,  666643, 20);
+        $s8  += self::mul($s19,  470296, 19);
+        $s9  += self::mul($s19,  654183, 20);
+        $s10 -= self::mul($s19,  997805, 20);
+        $s11 += self::mul($s19,  136657, 18);
+        $s12 -= self::mul($s19,  683901, 20);
+
+        $s6  += self::mul($s18,  666643, 20);
+        $s7  += self::mul($s18,  470296, 19);
+        $s8  += self::mul($s18,  654183, 20);
+        $s9  -= self::mul($s18,  997805, 20);
+        $s10 += self::mul($s18,  136657, 18);
+        $s11 -= self::mul($s18,  683901, 20);
+
+        /** @var int $carry6 */
+        $carry6 = ($s6 + (1 << 20)) >> 21;
+        $s7 += $carry6;
+        $s6 -= $carry6 << 21;
+        /** @var int $carry8 */
+        $carry8 = ($s8 + (1 << 20)) >> 21;
+        $s9 += $carry8;
+        $s8 -= $carry8 << 21;
+        /** @var int $carry10 */
+        $carry10 = ($s10 + (1 << 20)) >> 21;
+        $s11 += $carry10;
+        $s10 -= $carry10 << 21;
+        /** @var int $carry12 */
+        $carry12 = ($s12 + (1 << 20)) >> 21;
+        $s13 += $carry12;
+        $s12 -= $carry12 << 21;
+        /** @var int $carry14 */
+        $carry14 = ($s14 + (1 << 20)) >> 21;
+        $s15 += $carry14;
+        $s14 -= $carry14 << 21;
+        /** @var int $carry16 */
+        $carry16 = ($s16 + (1 << 20)) >> 21;
+        $s17 += $carry16;
+        $s16 -= $carry16 << 21;
+
+        /** @var int $carry7 */
+        $carry7 = ($s7 + (1 << 20)) >> 21;
+        $s8 += $carry7;
+        $s7 -= $carry7 << 21;
+        /** @var int $carry9 */
+        $carry9 = ($s9 + (1 << 20)) >> 21;
+        $s10 += $carry9;
+        $s9 -= $carry9 << 21;
+        /** @var int $carry11 */
+        $carry11 = ($s11 + (1 << 20)) >> 21;
+        $s12 += $carry11;
+        $s11 -= $carry11 << 21;
+        /** @var int $carry13 */
+        $carry13 = ($s13 + (1 << 20)) >> 21;
+        $s14 += $carry13;
+        $s13 -= $carry13 << 21;
+        /** @var int $carry15 */
+        $carry15 = ($s15 + (1 << 20)) >> 21;
+        $s16 += $carry15;
+        $s15 -= $carry15 << 21;
+
+        $s5  += self::mul($s17,  666643, 20);
+        $s6  += self::mul($s17,  470296, 19);
+        $s7  += self::mul($s17,  654183, 20);
+        $s8  -= self::mul($s17,  997805, 20);
+        $s9  += self::mul($s17,  136657, 18);
+        $s10 -= self::mul($s17,  683901, 20);
+
+        $s4 += self::mul($s16,  666643, 20);
+        $s5 += self::mul($s16,  470296, 19);
+        $s6 += self::mul($s16,  654183, 20);
+        $s7 -= self::mul($s16,  997805, 20);
+        $s8 += self::mul($s16,  136657, 18);
+        $s9 -= self::mul($s16,  683901, 20);
+
+        $s3 += self::mul($s15,  666643, 20);
+        $s4 += self::mul($s15,  470296, 19);
+        $s5 += self::mul($s15,  654183, 20);
+        $s6 -= self::mul($s15,  997805, 20);
+        $s7 += self::mul($s15,  136657, 18);
+        $s8 -= self::mul($s15,  683901, 20);
+
+        $s2 += self::mul($s14,  666643, 20);
+        $s3 += self::mul($s14,  470296, 19);
+        $s4 += self::mul($s14,  654183, 20);
+        $s5 -= self::mul($s14,  997805, 20);
+        $s6 += self::mul($s14,  136657, 18);
+        $s7 -= self::mul($s14,  683901, 20);
+
+        $s1 += self::mul($s13,  666643, 20);
+        $s2 += self::mul($s13,  470296, 19);
+        $s3 += self::mul($s13,  654183, 20);
+        $s4 -= self::mul($s13,  997805, 20);
+        $s5 += self::mul($s13,  136657, 18);
+        $s6 -= self::mul($s13,  683901, 20);
+
+        $s0 += self::mul($s12,  666643, 20);
+        $s1 += self::mul($s12,  470296, 19);
+        $s2 += self::mul($s12,  654183, 20);
+        $s3 -= self::mul($s12,  997805, 20);
+        $s4 += self::mul($s12,  136657, 18);
+        $s5 -= self::mul($s12,  683901, 20);
+        $s12 = 0;
+
+        /** @var int $carry0 */
+        $carry0 = ($s0 + (1 << 20)) >> 21;
+        $s1 += $carry0;
+        $s0 -= $carry0 << 21;
+        /** @var int $carry2 */
+        $carry2 = ($s2 + (1 << 20)) >> 21;
+        $s3 += $carry2;
+        $s2 -= $carry2 << 21;
+        /** @var int $carry4 */
+        $carry4 = ($s4 + (1 << 20)) >> 21;
+        $s5 += $carry4;
+        $s4 -= $carry4 << 21;
+        /** @var int $carry6 */
+        $carry6 = ($s6 + (1 << 20)) >> 21;
+        $s7 += $carry6;
+        $s6 -= $carry6 << 21;
+        /** @var int $carry8 */
+        $carry8 = ($s8 + (1 << 20)) >> 21;
+        $s9 += $carry8;
+        $s8 -= $carry8 << 21;
+        /** @var int $carry10 */
+        $carry10 = ($s10 + (1 << 20)) >> 21;
+        $s11 += $carry10;
+        $s10 -= $carry10 << 21;
+
+        /** @var int $carry1 */
+        $carry1 = ($s1 + (1 << 20)) >> 21;
+        $s2 += $carry1;
+        $s1 -= $carry1 << 21;
+        /** @var int $carry3 */
+        $carry3 = ($s3 + (1 << 20)) >> 21;
+        $s4 += $carry3;
+        $s3 -= $carry3 << 21;
+        /** @var int $carry5 */
+        $carry5 = ($s5 + (1 << 20)) >> 21;
+        $s6 += $carry5;
+        $s5 -= $carry5 << 21;
+        /** @var int $carry7 */
+        $carry7 = ($s7 + (1 << 20)) >> 21;
+        $s8 += $carry7;
+        $s7 -= $carry7 << 21;
+        /** @var int $carry9 */
+        $carry9 = ($s9 + (1 << 20)) >> 21;
+        $s10 += $carry9;
+        $s9 -= $carry9 << 21;
+        /** @var int $carry11 */
+        $carry11 = ($s11 + (1 << 20)) >> 21;
+        $s12 += $carry11;
+        $s11 -= $carry11 << 21;
+
+        $s0 += self::mul($s12,  666643, 20);
+        $s1 += self::mul($s12,  470296, 19);
+        $s2 += self::mul($s12,  654183, 20);
+        $s3 -= self::mul($s12,  997805, 20);
+        $s4 += self::mul($s12,  136657, 18);
+        $s5 -= self::mul($s12,  683901, 20);
+        $s12 = 0;
+
+        /** @var int $carry0 */
+        $carry0 = $s0 >> 21;
+        $s1 += $carry0;
+        $s0 -= $carry0 << 21;
+        /** @var int $carry1 */
+        $carry1 = $s1 >> 21;
+        $s2 += $carry1;
+        $s1 -= $carry1 << 21;
+        /** @var int $carry2 */
+        $carry2 = $s2 >> 21;
+        $s3 += $carry2;
+        $s2 -= $carry2 << 21;
+        /** @var int $carry3 */
+        $carry3 = $s3 >> 21;
+        $s4 += $carry3;
+        $s3 -= $carry3 << 21;
+        /** @var int $carry4 */
+        $carry4 = $s4 >> 21;
+        $s5 += $carry4;
+        $s4 -= $carry4 << 21;
+        /** @var int $carry5 */
+        $carry5 = $s5 >> 21;
+        $s6 += $carry5;
+        $s5 -= $carry5 << 21;
+        /** @var int $carry6 */
+        $carry6 = $s6 >> 21;
+        $s7 += $carry6;
+        $s6 -= $carry6 << 21;
+        /** @var int $carry7 */
+        $carry7 = $s7 >> 21;
+        $s8 += $carry7;
+        $s7 -= $carry7 << 21;
+        /** @var int $carry8 */
+        $carry8 = $s8 >> 21;
+        $s9 += $carry8;
+        $s8 -= $carry8 << 21;
+        /** @var int $carry9 */
+        $carry9 = $s9 >> 21;
+        $s10 += $carry9;
+        $s9 -= $carry9 << 21;
+        /** @var int $carry10 */
+        $carry10 = $s10 >> 21;
+        $s11 += $carry10;
+        $s10 -= $carry10 << 21;
+        /** @var int $carry11 */
+        $carry11 = $s11 >> 21;
+        $s12 += $carry11;
+        $s11 -= $carry11 << 21;
+
+        $s0 += self::mul($s12,  666643, 20);
+        $s1 += self::mul($s12,  470296, 19);
+        $s2 += self::mul($s12,  654183, 20);
+        $s3 -= self::mul($s12,  997805, 20);
+        $s4 += self::mul($s12,  136657, 18);
+        $s5 -= self::mul($s12,  683901, 20);
+
+        /** @var int $carry0 */
+        $carry0 = $s0 >> 21;
+        $s1 += $carry0;
+        $s0 -= $carry0 << 21;
+        /** @var int $carry1 */
+        $carry1 = $s1 >> 21;
+        $s2 += $carry1;
+        $s1 -= $carry1 << 21;
+        /** @var int $carry2 */
+        $carry2 = $s2 >> 21;
+        $s3 += $carry2;
+        $s2 -= $carry2 << 21;
+        /** @var int $carry3 */
+        $carry3 = $s3 >> 21;
+        $s4 += $carry3;
+        $s3 -= $carry3 << 21;
+        /** @var int $carry4 */
+        $carry4 = $s4 >> 21;
+        $s5 += $carry4;
+        $s4 -= $carry4 << 21;
+        /** @var int $carry5 */
+        $carry5 = $s5 >> 21;
+        $s6 += $carry5;
+        $s5 -= $carry5 << 21;
+        /** @var int $carry6 */
+        $carry6 = $s6 >> 21;
+        $s7 += $carry6;
+        $s6 -= $carry6 << 21;
+        /** @var int $carry7 */
+        $carry7 = $s7 >> 21;
+        $s8 += $carry7;
+        $s7 -= $carry7 << 21;
+        /** @var int $carry8 */
+        $carry8 = $s8 >> 21;
+        $s9 += $carry8;
+        $s8 -= $carry8 << 21;
+        /** @var int $carry9 */
+        $carry9 = $s9 >> 21;
+        $s10 += $carry9;
+        $s9 -= $carry9 << 21;
+        /** @var int $carry10 */
+        $carry10 = $s10 >> 21;
+        $s11 += $carry10;
+        $s10 -= $carry10 << 21;
+
+        /**
+         * @var array<int, int>
+         */
+        $arr = array(
+            (int) (0xff & ($s0 >> 0)),
+            (int) (0xff & ($s0 >> 8)),
+            (int) (0xff & (($s0 >> 16) | $s1 << 5)),
+            (int) (0xff & ($s1 >> 3)),
+            (int) (0xff & ($s1 >> 11)),
+            (int) (0xff & (($s1 >> 19) | $s2 << 2)),
+            (int) (0xff & ($s2 >> 6)),
+            (int) (0xff & (($s2 >> 14) | $s3 << 7)),
+            (int) (0xff & ($s3 >> 1)),
+            (int) (0xff & ($s3 >> 9)),
+            (int) (0xff & (($s3 >> 17) | $s4 << 4)),
+            (int) (0xff & ($s4 >> 4)),
+            (int) (0xff & ($s4 >> 12)),
+            (int) (0xff & (($s4 >> 20) | $s5 << 1)),
+            (int) (0xff & ($s5 >> 7)),
+            (int) (0xff & (($s5 >> 15) | $s6 << 6)),
+            (int) (0xff & ($s6 >> 2)),
+            (int) (0xff & ($s6 >> 10)),
+            (int) (0xff & (($s6 >> 18) | $s7 << 3)),
+            (int) (0xff & ($s7 >> 5)),
+            (int) (0xff & ($s7 >> 13)),
+            (int) (0xff & ($s8 >> 0)),
+            (int) (0xff & ($s8 >> 8)),
+            (int) (0xff & (($s8 >> 16) | $s9 << 5)),
+            (int) (0xff & ($s9 >> 3)),
+            (int) (0xff & ($s9 >> 11)),
+            (int) (0xff & (($s9 >> 19) | $s10 << 2)),
+            (int) (0xff & ($s10 >> 6)),
+            (int) (0xff & (($s10 >> 14) | $s11 << 7)),
+            (int) (0xff & ($s11 >> 1)),
+            (int) (0xff & ($s11 >> 9)),
+            0xff & ($s11 >> 17)
+        );
+        return self::intArrayToString($arr);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $s
+     * @return string
+     * @throws TypeError
+     */
+    public static function sc_reduce($s)
+    {
+        /** @var int $s0 */
+        $s0 = 2097151 & self::load_3(self::substr($s, 0, 3));
+        /** @var int $s1 */
+        $s1 = 2097151 & (self::load_4(self::substr($s, 2, 4)) >> 5);
+        /** @var int $s2 */
+        $s2 = 2097151 & (self::load_3(self::substr($s, 5, 3)) >> 2);
+        /** @var int $s3 */
+        $s3 = 2097151 & (self::load_4(self::substr($s, 7, 4)) >> 7);
+        /** @var int $s4 */
+        $s4 = 2097151 & (self::load_4(self::substr($s, 10, 4)) >> 4);
+        /** @var int $s5 */
+        $s5 = 2097151 & (self::load_3(self::substr($s, 13, 3)) >> 1);
+        /** @var int $s6 */
+        $s6 = 2097151 & (self::load_4(self::substr($s, 15, 4)) >> 6);
+        /** @var int $s7 */
+        $s7 = 2097151 & (self::load_3(self::substr($s, 18, 4)) >> 3);
+        /** @var int $s8 */
+        $s8 = 2097151 & self::load_3(self::substr($s, 21, 3));
+        /** @var int $s9 */
+        $s9 = 2097151 & (self::load_4(self::substr($s, 23, 4)) >> 5);
+        /** @var int $s10 */
+        $s10 = 2097151 & (self::load_3(self::substr($s, 26, 3)) >> 2);
+        /** @var int $s11 */
+        $s11 = 2097151 & (self::load_4(self::substr($s, 28, 4)) >> 7);
+        /** @var int $s12 */
+        $s12 = 2097151 & (self::load_4(self::substr($s, 31, 4)) >> 4);
+        /** @var int $s13 */
+        $s13 = 2097151 & (self::load_3(self::substr($s, 34, 3)) >> 1);
+        /** @var int $s14 */
+        $s14 = 2097151 & (self::load_4(self::substr($s, 36, 4)) >> 6);
+        /** @var int $s15 */
+        $s15 = 2097151 & (self::load_3(self::substr($s, 39, 4)) >> 3);
+        /** @var int $s16 */
+        $s16 = 2097151 & self::load_3(self::substr($s, 42, 3));
+        /** @var int $s17 */
+        $s17 = 2097151 & (self::load_4(self::substr($s, 44, 4)) >> 5);
+        /** @var int $s18 */
+        $s18 = 2097151 & (self::load_3(self::substr($s, 47, 3)) >> 2);
+        /** @var int $s19 */
+        $s19 = 2097151 & (self::load_4(self::substr($s, 49, 4)) >> 7);
+        /** @var int $s20 */
+        $s20 = 2097151 & (self::load_4(self::substr($s, 52, 4)) >> 4);
+        /** @var int $s21 */
+        $s21 = 2097151 & (self::load_3(self::substr($s, 55, 3)) >> 1);
+        /** @var int $s22 */
+        $s22 = 2097151 & (self::load_4(self::substr($s, 57, 4)) >> 6);
+        /** @var int $s23 */
+        $s23 = (self::load_4(self::substr($s, 60, 4)) >> 3);
+
+        $s11 += self::mul($s23,  666643, 20);
+        $s12 += self::mul($s23,  470296, 19);
+        $s13 += self::mul($s23,  654183, 20);
+        $s14 -= self::mul($s23,  997805, 20);
+        $s15 += self::mul($s23,  136657, 18);
+        $s16 -= self::mul($s23,  683901, 20);
+
+        $s10 += self::mul($s22,  666643, 20);
+        $s11 += self::mul($s22,  470296, 19);
+        $s12 += self::mul($s22,  654183, 20);
+        $s13 -= self::mul($s22,  997805, 20);
+        $s14 += self::mul($s22,  136657, 18);
+        $s15 -= self::mul($s22,  683901, 20);
+
+        $s9  += self::mul($s21,  666643, 20);
+        $s10 += self::mul($s21,  470296, 19);
+        $s11 += self::mul($s21,  654183, 20);
+        $s12 -= self::mul($s21,  997805, 20);
+        $s13 += self::mul($s21,  136657, 18);
+        $s14 -= self::mul($s21,  683901, 20);
+
+        $s8  += self::mul($s20,  666643, 20);
+        $s9  += self::mul($s20,  470296, 19);
+        $s10 += self::mul($s20,  654183, 20);
+        $s11 -= self::mul($s20,  997805, 20);
+        $s12 += self::mul($s20,  136657, 18);
+        $s13 -= self::mul($s20,  683901, 20);
+
+        $s7  += self::mul($s19,  666643, 20);
+        $s8  += self::mul($s19,  470296, 19);
+        $s9  += self::mul($s19,  654183, 20);
+        $s10 -= self::mul($s19,  997805, 20);
+        $s11 += self::mul($s19,  136657, 18);
+        $s12 -= self::mul($s19,  683901, 20);
+
+        $s6  += self::mul($s18,  666643, 20);
+        $s7  += self::mul($s18,  470296, 19);
+        $s8  += self::mul($s18,  654183, 20);
+        $s9  -= self::mul($s18,  997805, 20);
+        $s10 += self::mul($s18,  136657, 18);
+        $s11 -= self::mul($s18,  683901, 20);
+
+        /** @var int $carry6 */
+        $carry6 = ($s6 + (1 << 20)) >> 21;
+        $s7 += $carry6;
+        $s6 -= $carry6 << 21;
+        /** @var int $carry8 */
+        $carry8 = ($s8 + (1 << 20)) >> 21;
+        $s9 += $carry8;
+        $s8 -= $carry8 << 21;
+        /** @var int $carry10 */
+        $carry10 = ($s10 + (1 << 20)) >> 21;
+        $s11 += $carry10;
+        $s10 -= $carry10 << 21;
+        /** @var int $carry12 */
+        $carry12 = ($s12 + (1 << 20)) >> 21;
+        $s13 += $carry12;
+        $s12 -= $carry12 << 21;
+        /** @var int $carry14 */
+        $carry14 = ($s14 + (1 << 20)) >> 21;
+        $s15 += $carry14;
+        $s14 -= $carry14 << 21;
+        /** @var int $carry16 */
+        $carry16 = ($s16 + (1 << 20)) >> 21;
+        $s17 += $carry16;
+        $s16 -= $carry16 << 21;
+
+        /** @var int $carry7 */
+        $carry7 = ($s7 + (1 << 20)) >> 21;
+        $s8 += $carry7;
+        $s7 -= $carry7 << 21;
+        /** @var int $carry9 */
+        $carry9 = ($s9 + (1 << 20)) >> 21;
+        $s10 += $carry9;
+        $s9 -= $carry9 << 21;
+        /** @var int $carry11 */
+        $carry11 = ($s11 + (1 << 20)) >> 21;
+        $s12 += $carry11;
+        $s11 -= $carry11 << 21;
+        /** @var int $carry13 */
+        $carry13 = ($s13 + (1 << 20)) >> 21;
+        $s14 += $carry13;
+        $s13 -= $carry13 << 21;
+        /** @var int $carry15 */
+        $carry15 = ($s15 + (1 << 20)) >> 21;
+        $s16 += $carry15;
+        $s15 -= $carry15 << 21;
+
+        $s5  += self::mul($s17,  666643, 20);
+        $s6  += self::mul($s17,  470296, 19);
+        $s7  += self::mul($s17,  654183, 20);
+        $s8  -= self::mul($s17,  997805, 20);
+        $s9  += self::mul($s17,  136657, 18);
+        $s10 -= self::mul($s17,  683901, 20);
+
+        $s4 += self::mul($s16,  666643, 20);
+        $s5 += self::mul($s16,  470296, 19);
+        $s6 += self::mul($s16,  654183, 20);
+        $s7 -= self::mul($s16,  997805, 20);
+        $s8 += self::mul($s16,  136657, 18);
+        $s9 -= self::mul($s16,  683901, 20);
+
+        $s3 += self::mul($s15,  666643, 20);
+        $s4 += self::mul($s15,  470296, 19);
+        $s5 += self::mul($s15,  654183, 20);
+        $s6 -= self::mul($s15,  997805, 20);
+        $s7 += self::mul($s15,  136657, 18);
+        $s8 -= self::mul($s15,  683901, 20);
+
+        $s2 += self::mul($s14,  666643, 20);
+        $s3 += self::mul($s14,  470296, 19);
+        $s4 += self::mul($s14,  654183, 20);
+        $s5 -= self::mul($s14,  997805, 20);
+        $s6 += self::mul($s14,  136657, 18);
+        $s7 -= self::mul($s14,  683901, 20);
+
+        $s1 += self::mul($s13,  666643, 20);
+        $s2 += self::mul($s13,  470296, 19);
+        $s3 += self::mul($s13,  654183, 20);
+        $s4 -= self::mul($s13,  997805, 20);
+        $s5 += self::mul($s13,  136657, 18);
+        $s6 -= self::mul($s13,  683901, 20);
+
+        $s0 += self::mul($s12,  666643, 20);
+        $s1 += self::mul($s12,  470296, 19);
+        $s2 += self::mul($s12,  654183, 20);
+        $s3 -= self::mul($s12,  997805, 20);
+        $s4 += self::mul($s12,  136657, 18);
+        $s5 -= self::mul($s12,  683901, 20);
+        $s12 = 0;
+
+        /** @var int $carry0 */
+        $carry0 = ($s0 + (1 << 20)) >> 21;
+        $s1 += $carry0;
+        $s0 -= $carry0 << 21;
+        /** @var int $carry2 */
+        $carry2 = ($s2 + (1 << 20)) >> 21;
+        $s3 += $carry2;
+        $s2 -= $carry2 << 21;
+        /** @var int $carry4 */
+        $carry4 = ($s4 + (1 << 20)) >> 21;
+        $s5 += $carry4;
+        $s4 -= $carry4 << 21;
+        /** @var int $carry6 */
+        $carry6 = ($s6 + (1 << 20)) >> 21;
+        $s7 += $carry6;
+        $s6 -= $carry6 << 21;
+        /** @var int $carry8 */
+        $carry8 = ($s8 + (1 << 20)) >> 21;
+        $s9 += $carry8;
+        $s8 -= $carry8 << 21;
+        /** @var int $carry10 */
+        $carry10 = ($s10 + (1 << 20)) >> 21;
+        $s11 += $carry10;
+        $s10 -= $carry10 << 21;
+
+        /** @var int $carry1 */
+        $carry1 = ($s1 + (1 << 20)) >> 21;
+        $s2 += $carry1;
+        $s1 -= $carry1 << 21;
+        /** @var int $carry3 */
+        $carry3 = ($s3 + (1 << 20)) >> 21;
+        $s4 += $carry3;
+        $s3 -= $carry3 << 21;
+        /** @var int $carry5 */
+        $carry5 = ($s5 + (1 << 20)) >> 21;
+        $s6 += $carry5;
+        $s5 -= $carry5 << 21;
+        /** @var int $carry7 */
+        $carry7 = ($s7 + (1 << 20)) >> 21;
+        $s8 += $carry7;
+        $s7 -= $carry7 << 21;
+        /** @var int $carry9 */
+        $carry9 = ($s9 + (1 << 20)) >> 21;
+        $s10 += $carry9;
+        $s9 -= $carry9 << 21;
+        /** @var int $carry11 */
+        $carry11 = ($s11 + (1 << 20)) >> 21;
+        $s12 += $carry11;
+        $s11 -= $carry11 << 21;
+
+        $s0 += self::mul($s12,  666643, 20);
+        $s1 += self::mul($s12,  470296, 19);
+        $s2 += self::mul($s12,  654183, 20);
+        $s3 -= self::mul($s12,  997805, 20);
+        $s4 += self::mul($s12,  136657, 18);
+        $s5 -= self::mul($s12,  683901, 20);
+        $s12 = 0;
+
+        /** @var int $carry0 */
+        $carry0 = $s0 >> 21;
+        $s1 += $carry0;
+        $s0 -= $carry0 << 21;
+        /** @var int $carry1 */
+        $carry1 = $s1 >> 21;
+        $s2 += $carry1;
+        $s1 -= $carry1 << 21;
+        /** @var int $carry2 */
+        $carry2 = $s2 >> 21;
+        $s3 += $carry2;
+        $s2 -= $carry2 << 21;
+        /** @var int $carry3 */
+        $carry3 = $s3 >> 21;
+        $s4 += $carry3;
+        $s3 -= $carry3 << 21;
+        /** @var int $carry4 */
+        $carry4 = $s4 >> 21;
+        $s5 += $carry4;
+        $s4 -= $carry4 << 21;
+        /** @var int $carry5 */
+        $carry5 = $s5 >> 21;
+        $s6 += $carry5;
+        $s5 -= $carry5 << 21;
+        /** @var int $carry6 */
+        $carry6 = $s6 >> 21;
+        $s7 += $carry6;
+        $s6 -= $carry6 << 21;
+        /** @var int $carry7 */
+        $carry7 = $s7 >> 21;
+        $s8 += $carry7;
+        $s7 -= $carry7 << 21;
+        /** @var int $carry8 */
+        $carry8 = $s8 >> 21;
+        $s9 += $carry8;
+        $s8 -= $carry8 << 21;
+        /** @var int $carry9 */
+        $carry9 = $s9 >> 21;
+        $s10 += $carry9;
+        $s9 -= $carry9 << 21;
+        /** @var int $carry10 */
+        $carry10 = $s10 >> 21;
+        $s11 += $carry10;
+        $s10 -= $carry10 << 21;
+        /** @var int $carry11 */
+        $carry11 = $s11 >> 21;
+        $s12 += $carry11;
+        $s11 -= $carry11 << 21;
+
+        $s0 += self::mul($s12,  666643, 20);
+        $s1 += self::mul($s12,  470296, 19);
+        $s2 += self::mul($s12,  654183, 20);
+        $s3 -= self::mul($s12,  997805, 20);
+        $s4 += self::mul($s12,  136657, 18);
+        $s5 -= self::mul($s12,  683901, 20);
+
+        /** @var int $carry0 */
+        $carry0 = $s0 >> 21;
+        $s1 += $carry0;
+        $s0 -= $carry0 << 21;
+        /** @var int $carry1 */
+        $carry1 = $s1 >> 21;
+        $s2 += $carry1;
+        $s1 -= $carry1 << 21;
+        /** @var int $carry2 */
+        $carry2 = $s2 >> 21;
+        $s3 += $carry2;
+        $s2 -= $carry2 << 21;
+        /** @var int $carry3 */
+        $carry3 = $s3 >> 21;
+        $s4 += $carry3;
+        $s3 -= $carry3 << 21;
+        /** @var int $carry4 */
+        $carry4 = $s4 >> 21;
+        $s5 += $carry4;
+        $s4 -= $carry4 << 21;
+        /** @var int $carry5 */
+        $carry5 = $s5 >> 21;
+        $s6 += $carry5;
+        $s5 -= $carry5 << 21;
+        /** @var int $carry6 */
+        $carry6 = $s6 >> 21;
+        $s7 += $carry6;
+        $s6 -= $carry6 << 21;
+        /** @var int $carry7 */
+        $carry7 = $s7 >> 21;
+        $s8 += $carry7;
+        $s7 -= $carry7 << 21;
+        /** @var int $carry8 */
+        $carry8 = $s8 >> 21;
+        $s9 += $carry8;
+        $s8 -= $carry8 << 21;
+        /** @var int $carry9 */
+        $carry9 = $s9 >> 21;
+        $s10 += $carry9;
+        $s9 -= $carry9 << 21;
+        /** @var int $carry10 */
+        $carry10 = $s10 >> 21;
+        $s11 += $carry10;
+        $s10 -= $carry10 << 21;
+
+        /**
+         * @var array<int, int>
+         */
+        $arr = array(
+            (int) ($s0 >> 0),
+            (int) ($s0 >> 8),
+            (int) (($s0 >> 16) | $s1 << 5),
+            (int) ($s1 >> 3),
+            (int) ($s1 >> 11),
+            (int) (($s1 >> 19) | $s2 << 2),
+            (int) ($s2 >> 6),
+            (int) (($s2 >> 14) | $s3 << 7),
+            (int) ($s3 >> 1),
+            (int) ($s3 >> 9),
+            (int) (($s3 >> 17) | $s4 << 4),
+            (int) ($s4 >> 4),
+            (int) ($s4 >> 12),
+            (int) (($s4 >> 20) | $s5 << 1),
+            (int) ($s5 >> 7),
+            (int) (($s5 >> 15) | $s6 << 6),
+            (int) ($s6 >> 2),
+            (int) ($s6 >> 10),
+            (int) (($s6 >> 18) | $s7 << 3),
+            (int) ($s7 >> 5),
+            (int) ($s7 >> 13),
+            (int) ($s8 >> 0),
+            (int) ($s8 >> 8),
+            (int) (($s8 >> 16) | $s9 << 5),
+            (int) ($s9 >> 3),
+            (int) ($s9 >> 11),
+            (int) (($s9 >> 19) | $s10 << 2),
+            (int) ($s10 >> 6),
+            (int) (($s10 >> 14) | $s11 << 7),
+            (int) ($s11 >> 1),
+            (int) ($s11 >> 9),
+            (int) $s11 >> 17
+        );
+        return self::intArrayToString($arr);
+    }
+
+    /**
+     * multiply by the order of the main subgroup l = 2^252+27742317777372353535851937790883648493
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $A
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P3
+     */
+    public static function ge_mul_l(ParagonIE_Sodium_Core_Curve25519_Ge_P3 $A)
+    {
+        /** @var array<int, int> $aslide */
+        $aslide = array(
+            13, 0, 0, 0, 0, -1, 0, 0, 0, 0, -11, 0, 0, 0, 0, 0, 0, -5, 0, 0, 0,
+            0, 0, 0, -3, 0, 0, 0, 0, -13, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 3, 0,
+            0, 0, 0, -13, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 0, 11, 0, 0, 0,
+            0, 0, 11, 0, 0, 0, 0, -13, 0, 0, 0, 0, 0, 0, -3, 0, 0, 0, 0, 0, -1,
+            0, 0, 0, 0, 3, 0, 0, 0, 0, -11, 0, 0, 0, 0, 0, 0, 0, 15, 0, 0, 0,
+            0, 0, -1, 0, 0, 0, 0, -1, 0, 0, 0, 0, 7, 0, 0, 0, 0, 5, 0, 0, 0, 0,
+            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
+        );
+
+        /** @var array<int, ParagonIE_Sodium_Core_Curve25519_Ge_Cached> $Ai size 8 */
+        $Ai = array();
+
+        # ge_p3_to_cached(&Ai[0], A);
+        $Ai[0] = self::ge_p3_to_cached($A);
+        # ge_p3_dbl(&t, A);
+        $t = self::ge_p3_dbl($A);
+        # ge_p1p1_to_p3(&A2, &t);
+        $A2 = self::ge_p1p1_to_p3($t);
+
+        for ($i = 1; $i < 8; ++$i) {
+            # ge_add(&t, &A2, &Ai[0]);
+            $t = self::ge_add($A2, $Ai[$i - 1]);
+            # ge_p1p1_to_p3(&u, &t);
+            $u = self::ge_p1p1_to_p3($t);
+            # ge_p3_to_cached(&Ai[i], &u);
+            $Ai[$i] = self::ge_p3_to_cached($u);
+        }
+
+        $r = self::ge_p3_0();
+        for ($i = 252; $i >= 0; --$i) {
+            $t = self::ge_p3_dbl($r);
+            if ($aslide[$i] > 0) {
+                # ge_p1p1_to_p3(&u, &t);
+                $u = self::ge_p1p1_to_p3($t);
+                # ge_add(&t, &u, &Ai[aslide[i] / 2]);
+                $t = self::ge_add($u, $Ai[(int)($aslide[$i] / 2)]);
+            } elseif ($aslide[$i] < 0) {
+                # ge_p1p1_to_p3(&u, &t);
+                $u = self::ge_p1p1_to_p3($t);
+                # ge_sub(&t, &u, &Ai[(-aslide[i]) / 2]);
+                $t = self::ge_sub($u, $Ai[(int)(-$aslide[$i] / 2)]);
+            }
+        }
+
+        # ge_p1p1_to_p3(r, &t);
+        return self::ge_p1p1_to_p3($t);
+    }
+
+    /**
+     * @param string $a
+     * @param string $b
+     * @return string
+     */
+    public static function sc25519_mul($a, $b)
+    {
+        //    int64_t a0  = 2097151 & load_3(a);
+        //    int64_t a1  = 2097151 & (load_4(a + 2) >> 5);
+        //    int64_t a2  = 2097151 & (load_3(a + 5) >> 2);
+        //    int64_t a3  = 2097151 & (load_4(a + 7) >> 7);
+        //    int64_t a4  = 2097151 & (load_4(a + 10) >> 4);
+        //    int64_t a5  = 2097151 & (load_3(a + 13) >> 1);
+        //    int64_t a6  = 2097151 & (load_4(a + 15) >> 6);
+        //    int64_t a7  = 2097151 & (load_3(a + 18) >> 3);
+        //    int64_t a8  = 2097151 & load_3(a + 21);
+        //    int64_t a9  = 2097151 & (load_4(a + 23) >> 5);
+        //    int64_t a10 = 2097151 & (load_3(a + 26) >> 2);
+        //    int64_t a11 = (load_4(a + 28) >> 7);
+        $a0  = 2097151 &  self::load_3(self::substr($a, 0, 3));
+        $a1  = 2097151 & (self::load_4(self::substr($a, 2, 4)) >> 5);
+        $a2  = 2097151 & (self::load_3(self::substr($a, 5, 3)) >> 2);
+        $a3  = 2097151 & (self::load_4(self::substr($a, 7, 4)) >> 7);
+        $a4  = 2097151 & (self::load_4(self::substr($a, 10, 4)) >> 4);
+        $a5  = 2097151 & (self::load_3(self::substr($a, 13, 3)) >> 1);
+        $a6  = 2097151 & (self::load_4(self::substr($a, 15, 4)) >> 6);
+        $a7  = 2097151 & (self::load_3(self::substr($a, 18, 3)) >> 3);
+        $a8  = 2097151 &  self::load_3(self::substr($a, 21, 3));
+        $a9  = 2097151 & (self::load_4(self::substr($a, 23, 4)) >> 5);
+        $a10 = 2097151 & (self::load_3(self::substr($a, 26, 3)) >> 2);
+        $a11 = (self::load_4(self::substr($a, 28, 4)) >> 7);
+
+        //    int64_t b0  = 2097151 & load_3(b);
+        //    int64_t b1  = 2097151 & (load_4(b + 2) >> 5);
+        //    int64_t b2  = 2097151 & (load_3(b + 5) >> 2);
+        //    int64_t b3  = 2097151 & (load_4(b + 7) >> 7);
+        //    int64_t b4  = 2097151 & (load_4(b + 10) >> 4);
+        //    int64_t b5  = 2097151 & (load_3(b + 13) >> 1);
+        //    int64_t b6  = 2097151 & (load_4(b + 15) >> 6);
+        //    int64_t b7  = 2097151 & (load_3(b + 18) >> 3);
+        //    int64_t b8  = 2097151 & load_3(b + 21);
+        //    int64_t b9  = 2097151 & (load_4(b + 23) >> 5);
+        //    int64_t b10 = 2097151 & (load_3(b + 26) >> 2);
+        //    int64_t b11 = (load_4(b + 28) >> 7);
+        $b0  = 2097151 &  self::load_3(self::substr($b, 0, 3));
+        $b1  = 2097151 & (self::load_4(self::substr($b, 2, 4)) >> 5);
+        $b2  = 2097151 & (self::load_3(self::substr($b, 5, 3)) >> 2);
+        $b3  = 2097151 & (self::load_4(self::substr($b, 7, 4)) >> 7);
+        $b4  = 2097151 & (self::load_4(self::substr($b, 10, 4)) >> 4);
+        $b5  = 2097151 & (self::load_3(self::substr($b, 13, 3)) >> 1);
+        $b6  = 2097151 & (self::load_4(self::substr($b, 15, 4)) >> 6);
+        $b7  = 2097151 & (self::load_3(self::substr($b, 18, 3)) >> 3);
+        $b8  = 2097151 &  self::load_3(self::substr($b, 21, 3));
+        $b9  = 2097151 & (self::load_4(self::substr($b, 23, 4)) >> 5);
+        $b10 = 2097151 & (self::load_3(self::substr($b, 26, 3)) >> 2);
+        $b11 = (self::load_4(self::substr($b, 28, 4)) >> 7);
+
+        //    s0 = a0 * b0;
+        //    s1 = a0 * b1 + a1 * b0;
+        //    s2 = a0 * b2 + a1 * b1 + a2 * b0;
+        //    s3 = a0 * b3 + a1 * b2 + a2 * b1 + a3 * b0;
+        //    s4 = a0 * b4 + a1 * b3 + a2 * b2 + a3 * b1 + a4 * b0;
+        //    s5 = a0 * b5 + a1 * b4 + a2 * b3 + a3 * b2 + a4 * b1 + a5 * b0;
+        //    s6 = a0 * b6 + a1 * b5 + a2 * b4 + a3 * b3 + a4 * b2 + a5 * b1 + a6 * b0;
+        //    s7 = a0 * b7 + a1 * b6 + a2 * b5 + a3 * b4 + a4 * b3 + a5 * b2 +
+        //        a6 * b1 + a7 * b0;
+        //    s8 = a0 * b8 + a1 * b7 + a2 * b6 + a3 * b5 + a4 * b4 + a5 * b3 +
+        //        a6 * b2 + a7 * b1 + a8 * b0;
+        //    s9 = a0 * b9 + a1 * b8 + a2 * b7 + a3 * b6 + a4 * b5 + a5 * b4 +
+        //        a6 * b3 + a7 * b2 + a8 * b1 + a9 * b0;
+        //    s10 = a0 * b10 + a1 * b9 + a2 * b8 + a3 * b7 + a4 * b6 + a5 * b5 +
+        //        a6 * b4 + a7 * b3 + a8 * b2 + a9 * b1 + a10 * b0;
+        //    s11 = a0 * b11 + a1 * b10 + a2 * b9 + a3 * b8 + a4 * b7 + a5 * b6 +
+        //        a6 * b5 + a7 * b4 + a8 * b3 + a9 * b2 + a10 * b1 + a11 * b0;
+        //    s12 = a1 * b11 + a2 * b10 + a3 * b9 + a4 * b8 + a5 * b7 + a6 * b6 +
+        //        a7 * b5 + a8 * b4 + a9 * b3 + a10 * b2 + a11 * b1;
+        //    s13 = a2 * b11 + a3 * b10 + a4 * b9 + a5 * b8 + a6 * b7 + a7 * b6 +
+        //        a8 * b5 + a9 * b4 + a10 * b3 + a11 * b2;
+        //    s14 = a3 * b11 + a4 * b10 + a5 * b9 + a6 * b8 + a7 * b7 + a8 * b6 +
+        //        a9 * b5 + a10 * b4 + a11 * b3;
+        //    s15 = a4 * b11 + a5 * b10 + a6 * b9 + a7 * b8 + a8 * b7 + a9 * b6 +
+        //        a10 * b5 + a11 * b4;
+        //    s16 =
+        //        a5 * b11 + a6 * b10 + a7 * b9 + a8 * b8 + a9 * b7 + a10 * b6 + a11 * b5;
+        //    s17 = a6 * b11 + a7 * b10 + a8 * b9 + a9 * b8 + a10 * b7 + a11 * b6;
+        //    s18 = a7 * b11 + a8 * b10 + a9 * b9 + a10 * b8 + a11 * b7;
+        //    s19 = a8 * b11 + a9 * b10 + a10 * b9 + a11 * b8;
+        //    s20 = a9 * b11 + a10 * b10 + a11 * b9;
+        //    s21 = a10 * b11 + a11 * b10;
+        //    s22 = a11 * b11;
+        //    s23 = 0;
+        $s0 = self::mul($a0, $b0, 22);
+        $s1 = self::mul($a0, $b1, 22) + self::mul($a1, $b0, 22);
+        $s2 = self::mul($a0, $b2, 22) + self::mul($a1, $b1, 22) + self::mul($a2, $b0, 22);
+        $s3 = self::mul($a0, $b3, 22) + self::mul($a1, $b2, 22) + self::mul($a2, $b1, 22) + self::mul($a3, $b0, 22);
+        $s4 = self::mul($a0, $b4, 22) + self::mul($a1, $b3, 22) + self::mul($a2, $b2, 22) + self::mul($a3, $b1, 22) +
+            self::mul($a4, $b0, 22);
+        $s5 = self::mul($a0, $b5, 22) + self::mul($a1, $b4, 22) + self::mul($a2, $b3, 22) + self::mul($a3, $b2, 22) +
+            self::mul($a4, $b1, 22) + self::mul($a5, $b0, 22);
+        $s6 = self::mul($a0, $b6, 22) + self::mul($a1, $b5, 22) + self::mul($a2, $b4, 22) + self::mul($a3, $b3, 22) +
+            self::mul($a4, $b2, 22) + self::mul($a5, $b1, 22) + self::mul($a6, $b0, 22);
+        $s7 = self::mul($a0, $b7, 22) + self::mul($a1, $b6, 22) + self::mul($a2, $b5, 22) + self::mul($a3, $b4, 22) +
+            self::mul($a4, $b3, 22) + self::mul($a5, $b2, 22) + self::mul($a6, $b1, 22) + self::mul($a7, $b0, 22);
+        $s8 = self::mul($a0, $b8, 22) + self::mul($a1, $b7, 22) + self::mul($a2, $b6, 22) + self::mul($a3, $b5, 22) +
+            self::mul($a4, $b4, 22) + self::mul($a5, $b3, 22) + self::mul($a6, $b2, 22) + self::mul($a7, $b1, 22) +
+            self::mul($a8, $b0, 22);
+        $s9 = self::mul($a0, $b9, 22) + self::mul($a1, $b8, 22) + self::mul($a2, $b7, 22) + self::mul($a3, $b6, 22) +
+            self::mul($a4, $b5, 22) + self::mul($a5, $b4, 22) + self::mul($a6, $b3, 22) + self::mul($a7, $b2, 22) +
+            self::mul($a8, $b1, 22) + self::mul($a9, $b0, 22);
+        $s10 = self::mul($a0, $b10, 22) + self::mul($a1, $b9, 22) + self::mul($a2, $b8, 22) + self::mul($a3, $b7, 22) +
+            self::mul($a4, $b6, 22) + self::mul($a5, $b5, 22) + self::mul($a6, $b4, 22) + self::mul($a7, $b3, 22) +
+            self::mul($a8, $b2, 22) + self::mul($a9, $b1, 22) + self::mul($a10, $b0, 22);
+        $s11 = self::mul($a0, $b11, 22) + self::mul($a1, $b10, 22) + self::mul($a2, $b9, 22) + self::mul($a3, $b8, 22) +
+            self::mul($a4, $b7, 22) + self::mul($a5, $b6, 22) + self::mul($a6, $b5, 22) + self::mul($a7, $b4, 22) +
+            self::mul($a8, $b3, 22) + self::mul($a9, $b2, 22) + self::mul($a10, $b1, 22) + self::mul($a11, $b0, 22);
+        $s12 = self::mul($a1, $b11, 22) + self::mul($a2, $b10, 22) + self::mul($a3, $b9, 22) + self::mul($a4, $b8, 22) +
+            self::mul($a5, $b7, 22) + self::mul($a6, $b6, 22) + self::mul($a7, $b5, 22) + self::mul($a8, $b4, 22) +
+            self::mul($a9, $b3, 22) + self::mul($a10, $b2, 22) + self::mul($a11, $b1, 22);
+        $s13 = self::mul($a2, $b11, 22) + self::mul($a3, $b10, 22) + self::mul($a4, $b9, 22) + self::mul($a5, $b8, 22) +
+            self::mul($a6, $b7, 22) + self::mul($a7, $b6, 22) + self::mul($a8, $b5, 22) + self::mul($a9, $b4, 22) +
+            self::mul($a10, $b3, 22) + self::mul($a11, $b2, 22);
+        $s14 = self::mul($a3, $b11, 22) + self::mul($a4, $b10, 22) + self::mul($a5, $b9, 22) + self::mul($a6, $b8, 22) +
+            self::mul($a7, $b7, 22) + self::mul($a8, $b6, 22) + self::mul($a9, $b5, 22) + self::mul($a10, $b4, 22) +
+            self::mul($a11, $b3, 22);
+        $s15 = self::mul($a4, $b11, 22) + self::mul($a5, $b10, 22) + self::mul($a6, $b9, 22) + self::mul($a7, $b8, 22) +
+            self::mul($a8, $b7, 22) + self::mul($a9, $b6, 22) + self::mul($a10, $b5, 22) + self::mul($a11, $b4, 22);
+        $s16 =
+            self::mul($a5, $b11, 22) + self::mul($a6, $b10, 22) + self::mul($a7, $b9, 22) + self::mul($a8, $b8, 22) +
+            self::mul($a9, $b7, 22) + self::mul($a10, $b6, 22) + self::mul($a11, $b5, 22);
+        $s17 = self::mul($a6, $b11, 22) + self::mul($a7, $b10, 22) + self::mul($a8, $b9, 22) + self::mul($a9, $b8, 22) +
+            self::mul($a10, $b7, 22) + self::mul($a11, $b6, 22);
+        $s18 = self::mul($a7, $b11, 22) + self::mul($a8, $b10, 22) + self::mul($a9, $b9, 22) + self::mul($a10, $b8, 22)
+            + self::mul($a11, $b7, 22);
+        $s19 = self::mul($a8, $b11, 22) + self::mul($a9, $b10, 22) + self::mul($a10, $b9, 22) +
+            self::mul($a11, $b8, 22);
+        $s20 = self::mul($a9, $b11, 22) + self::mul($a10, $b10, 22) + self::mul($a11, $b9, 22);
+        $s21 = self::mul($a10, $b11, 22) + self::mul($a11, $b10, 22);
+        $s22 = self::mul($a11, $b11, 22);
+        $s23 = 0;
+
+        //    carry0 = (s0 + (int64_t) (1L << 20)) >> 21;
+        //    s1 += carry0;
+        //    s0 -= carry0 * ((uint64_t) 1L << 21);
+        $carry0 = ($s0 + (1 << 20)) >> 21;
+        $s1 += $carry0;
+        $s0 -= $carry0 << 21;
+        //    carry2 = (s2 + (int64_t) (1L << 20)) >> 21;
+        //    s3 += carry2;
+        //    s2 -= carry2 * ((uint64_t) 1L << 21);
+        $carry2 = ($s2 + (1 << 20)) >> 21;
+        $s3 += $carry2;
+        $s2 -= $carry2 << 21;
+        //    carry4 = (s4 + (int64_t) (1L << 20)) >> 21;
+        //    s5 += carry4;
+        //    s4 -= carry4 * ((uint64_t) 1L << 21);
+        $carry4 = ($s4 + (1 << 20)) >> 21;
+        $s5 += $carry4;
+        $s4 -= $carry4 << 21;
+        //    carry6 = (s6 + (int64_t) (1L << 20)) >> 21;
+        //    s7 += carry6;
+        //    s6 -= carry6 * ((uint64_t) 1L << 21);
+        $carry6 = ($s6 + (1 << 20)) >> 21;
+        $s7 += $carry6;
+        $s6 -= $carry6 << 21;
+        //    carry8 = (s8 + (int64_t) (1L << 20)) >> 21;
+        //    s9 += carry8;
+        //    s8 -= carry8 * ((uint64_t) 1L << 21);
+        $carry8 = ($s8 + (1 << 20)) >> 21;
+        $s9 += $carry8;
+        $s8 -= $carry8 << 21;
+        //    carry10 = (s10 + (int64_t) (1L << 20)) >> 21;
+        //    s11 += carry10;
+        //    s10 -= carry10 * ((uint64_t) 1L << 21);
+        $carry10 = ($s10 + (1 << 20)) >> 21;
+        $s11 += $carry10;
+        $s10 -= $carry10 << 21;
+        //    carry12 = (s12 + (int64_t) (1L << 20)) >> 21;
+        //    s13 += carry12;
+        //    s12 -= carry12 * ((uint64_t) 1L << 21);
+        $carry12 = ($s12 + (1 << 20)) >> 21;
+        $s13 += $carry12;
+        $s12 -= $carry12 << 21;
+        //    carry14 = (s14 + (int64_t) (1L << 20)) >> 21;
+        //    s15 += carry14;
+        //    s14 -= carry14 * ((uint64_t) 1L << 21);
+        $carry14 = ($s14 + (1 << 20)) >> 21;
+        $s15 += $carry14;
+        $s14 -= $carry14 << 21;
+        //    carry16 = (s16 + (int64_t) (1L << 20)) >> 21;
+        //    s17 += carry16;
+        //    s16 -= carry16 * ((uint64_t) 1L << 21);
+        $carry16 = ($s16 + (1 << 20)) >> 21;
+        $s17 += $carry16;
+        $s16 -= $carry16 << 21;
+        //    carry18 = (s18 + (int64_t) (1L << 20)) >> 21;
+        //    s19 += carry18;
+        //    s18 -= carry18 * ((uint64_t) 1L << 21);
+        $carry18 = ($s18 + (1 << 20)) >> 21;
+        $s19 += $carry18;
+        $s18 -= $carry18 << 21;
+        //    carry20 = (s20 + (int64_t) (1L << 20)) >> 21;
+        //    s21 += carry20;
+        //    s20 -= carry20 * ((uint64_t) 1L << 21);
+        $carry20 = ($s20 + (1 << 20)) >> 21;
+        $s21 += $carry20;
+        $s20 -= $carry20 << 21;
+        //    carry22 = (s22 + (int64_t) (1L << 20)) >> 21;
+        //    s23 += carry22;
+        //    s22 -= carry22 * ((uint64_t) 1L << 21);
+        $carry22 = ($s22 + (1 << 20)) >> 21;
+        $s23 += $carry22;
+        $s22 -= $carry22 << 21;
+
+        //    carry1 = (s1 + (int64_t) (1L << 20)) >> 21;
+        //    s2 += carry1;
+        //    s1 -= carry1 * ((uint64_t) 1L << 21);
+        $carry1 = ($s1 + (1 << 20)) >> 21;
+        $s2 += $carry1;
+        $s1 -= $carry1 << 21;
+        //    carry3 = (s3 + (int64_t) (1L << 20)) >> 21;
+        //    s4 += carry3;
+        //    s3 -= carry3 * ((uint64_t) 1L << 21);
+        $carry3 = ($s3 + (1 << 20)) >> 21;
+        $s4 += $carry3;
+        $s3 -= $carry3 << 21;
+        //    carry5 = (s5 + (int64_t) (1L << 20)) >> 21;
+        //    s6 += carry5;
+        //    s5 -= carry5 * ((uint64_t) 1L << 21);
+        $carry5 = ($s5 + (1 << 20)) >> 21;
+        $s6 += $carry5;
+        $s5 -= $carry5 << 21;
+        //    carry7 = (s7 + (int64_t) (1L << 20)) >> 21;
+        //    s8 += carry7;
+        //    s7 -= carry7 * ((uint64_t) 1L << 21);
+        $carry7 = ($s7 + (1 << 20)) >> 21;
+        $s8 += $carry7;
+        $s7 -= $carry7 << 21;
+        //    carry9 = (s9 + (int64_t) (1L << 20)) >> 21;
+        //    s10 += carry9;
+        //    s9 -= carry9 * ((uint64_t) 1L << 21);
+        $carry9 = ($s9 + (1 << 20)) >> 21;
+        $s10 += $carry9;
+        $s9 -= $carry9 << 21;
+        //    carry11 = (s11 + (int64_t) (1L << 20)) >> 21;
+        //    s12 += carry11;
+        //    s11 -= carry11 * ((uint64_t) 1L << 21);
+        $carry11 = ($s11 + (1 << 20)) >> 21;
+        $s12 += $carry11;
+        $s11 -= $carry11 << 21;
+        //    carry13 = (s13 + (int64_t) (1L << 20)) >> 21;
+        //    s14 += carry13;
+        //    s13 -= carry13 * ((uint64_t) 1L << 21);
+        $carry13 = ($s13 + (1 << 20)) >> 21;
+        $s14 += $carry13;
+        $s13 -= $carry13 << 21;
+        //    carry15 = (s15 + (int64_t) (1L << 20)) >> 21;
+        //    s16 += carry15;
+        //    s15 -= carry15 * ((uint64_t) 1L << 21);
+        $carry15 = ($s15 + (1 << 20)) >> 21;
+        $s16 += $carry15;
+        $s15 -= $carry15 << 21;
+        //    carry17 = (s17 + (int64_t) (1L << 20)) >> 21;
+        //    s18 += carry17;
+        //    s17 -= carry17 * ((uint64_t) 1L << 21);
+        $carry17 = ($s17 + (1 << 20)) >> 21;
+        $s18 += $carry17;
+        $s17 -= $carry17 << 21;
+        //    carry19 = (s19 + (int64_t) (1L << 20)) >> 21;
+        //    s20 += carry19;
+        //    s19 -= carry19 * ((uint64_t) 1L << 21);
+        $carry19 = ($s19 + (1 << 20)) >> 21;
+        $s20 += $carry19;
+        $s19 -= $carry19 << 21;
+        //    carry21 = (s21 + (int64_t) (1L << 20)) >> 21;
+        //    s22 += carry21;
+        //    s21 -= carry21 * ((uint64_t) 1L << 21);
+        $carry21 = ($s21 + (1 << 20)) >> 21;
+        $s22 += $carry21;
+        $s21 -= $carry21 << 21;
+
+        //    s11 += s23 * 666643;
+        //    s12 += s23 * 470296;
+        //    s13 += s23 * 654183;
+        //    s14 -= s23 * 997805;
+        //    s15 += s23 * 136657;
+        //    s16 -= s23 * 683901;
+        $s11 += self::mul($s23, 666643, 20);
+        $s12 += self::mul($s23, 470296, 19);
+        $s13 += self::mul($s23, 654183, 20);
+        $s14 -= self::mul($s23, 997805, 20);
+        $s15 += self::mul($s23, 136657, 18);
+        $s16 -= self::mul($s23, 683901, 20);
+
+        //    s10 += s22 * 666643;
+        //    s11 += s22 * 470296;
+        //    s12 += s22 * 654183;
+        //    s13 -= s22 * 997805;
+        //    s14 += s22 * 136657;
+        //    s15 -= s22 * 683901;
+        $s10 += self::mul($s22, 666643, 20);
+        $s11 += self::mul($s22, 470296, 19);
+        $s12 += self::mul($s22, 654183, 20);
+        $s13 -= self::mul($s22, 997805, 20);
+        $s14 += self::mul($s22, 136657, 18);
+        $s15 -= self::mul($s22, 683901, 20);
+
+        //    s9 += s21 * 666643;
+        //    s10 += s21 * 470296;
+        //    s11 += s21 * 654183;
+        //    s12 -= s21 * 997805;
+        //    s13 += s21 * 136657;
+        //    s14 -= s21 * 683901;
+        $s9 += self::mul($s21, 666643, 20);
+        $s10 += self::mul($s21, 470296, 19);
+        $s11 += self::mul($s21, 654183, 20);
+        $s12 -= self::mul($s21, 997805, 20);
+        $s13 += self::mul($s21, 136657, 18);
+        $s14 -= self::mul($s21, 683901, 20);
+
+        //    s8 += s20 * 666643;
+        //    s9 += s20 * 470296;
+        //    s10 += s20 * 654183;
+        //    s11 -= s20 * 997805;
+        //    s12 += s20 * 136657;
+        //    s13 -= s20 * 683901;
+        $s8 += self::mul($s20, 666643, 20);
+        $s9 += self::mul($s20, 470296, 19);
+        $s10 += self::mul($s20, 654183, 20);
+        $s11 -= self::mul($s20, 997805, 20);
+        $s12 += self::mul($s20, 136657, 18);
+        $s13 -= self::mul($s20, 683901, 20);
+
+        //    s7 += s19 * 666643;
+        //    s8 += s19 * 470296;
+        //    s9 += s19 * 654183;
+        //    s10 -= s19 * 997805;
+        //    s11 += s19 * 136657;
+        //    s12 -= s19 * 683901;
+        $s7 += self::mul($s19, 666643, 20);
+        $s8 += self::mul($s19, 470296, 19);
+        $s9 += self::mul($s19, 654183, 20);
+        $s10 -= self::mul($s19, 997805, 20);
+        $s11 += self::mul($s19, 136657, 18);
+        $s12 -= self::mul($s19, 683901, 20);
+
+        //    s6 += s18 * 666643;
+        //    s7 += s18 * 470296;
+        //    s8 += s18 * 654183;
+        //    s9 -= s18 * 997805;
+        //    s10 += s18 * 136657;
+        //    s11 -= s18 * 683901;
+        $s6 += self::mul($s18, 666643, 20);
+        $s7 += self::mul($s18, 470296, 19);
+        $s8 += self::mul($s18, 654183, 20);
+        $s9 -= self::mul($s18, 997805, 20);
+        $s10 += self::mul($s18, 136657, 18);
+        $s11 -= self::mul($s18, 683901, 20);
+
+        //    carry6 = (s6 + (int64_t) (1L << 20)) >> 21;
+        //    s7 += carry6;
+        //    s6 -= carry6 * ((uint64_t) 1L << 21);
+        $carry6 = ($s6 + (1 << 20)) >> 21;
+        $s7 += $carry6;
+        $s6 -= $carry6 << 21;
+        //    carry8 = (s8 + (int64_t) (1L << 20)) >> 21;
+        //    s9 += carry8;
+        //    s8 -= carry8 * ((uint64_t) 1L << 21);
+        $carry8 = ($s8 + (1 << 20)) >> 21;
+        $s9 += $carry8;
+        $s8 -= $carry8 << 21;
+        //    carry10 = (s10 + (int64_t) (1L << 20)) >> 21;
+        //    s11 += carry10;
+        //    s10 -= carry10 * ((uint64_t) 1L << 21);
+        $carry10 = ($s10 + (1 << 20)) >> 21;
+        $s11 += $carry10;
+        $s10 -= $carry10 << 21;
+        //    carry12 = (s12 + (int64_t) (1L << 20)) >> 21;
+        //    s13 += carry12;
+        //    s12 -= carry12 * ((uint64_t) 1L << 21);
+        $carry12 = ($s12 + (1 << 20)) >> 21;
+        $s13 += $carry12;
+        $s12 -= $carry12 << 21;
+        //    carry14 = (s14 + (int64_t) (1L << 20)) >> 21;
+        //    s15 += carry14;
+        //    s14 -= carry14 * ((uint64_t) 1L << 21);
+        $carry14 = ($s14 + (1 << 20)) >> 21;
+        $s15 += $carry14;
+        $s14 -= $carry14 << 21;
+        //    carry16 = (s16 + (int64_t) (1L << 20)) >> 21;
+        //    s17 += carry16;
+        //    s16 -= carry16 * ((uint64_t) 1L << 21);
+        $carry16 = ($s16 + (1 << 20)) >> 21;
+        $s17 += $carry16;
+        $s16 -= $carry16 << 21;
+
+        //    carry7 = (s7 + (int64_t) (1L << 20)) >> 21;
+        //    s8 += carry7;
+        //    s7 -= carry7 * ((uint64_t) 1L << 21);
+        $carry7 = ($s7 + (1 << 20)) >> 21;
+        $s8 += $carry7;
+        $s7 -= $carry7 << 21;
+        //    carry9 = (s9 + (int64_t) (1L << 20)) >> 21;
+        //    s10 += carry9;
+        //    s9 -= carry9 * ((uint64_t) 1L << 21);
+        $carry9 = ($s9 + (1 << 20)) >> 21;
+        $s10 += $carry9;
+        $s9 -= $carry9 << 21;
+        //    carry11 = (s11 + (int64_t) (1L << 20)) >> 21;
+        //    s12 += carry11;
+        //    s11 -= carry11 * ((uint64_t) 1L << 21);
+        $carry11 = ($s11 + (1 << 20)) >> 21;
+        $s12 += $carry11;
+        $s11 -= $carry11 << 21;
+        //    carry13 = (s13 + (int64_t) (1L << 20)) >> 21;
+        //    s14 += carry13;
+        //    s13 -= carry13 * ((uint64_t) 1L << 21);
+        $carry13 = ($s13 + (1 << 20)) >> 21;
+        $s14 += $carry13;
+        $s13 -= $carry13 << 21;
+        //    carry15 = (s15 + (int64_t) (1L << 20)) >> 21;
+        //    s16 += carry15;
+        //    s15 -= carry15 * ((uint64_t) 1L << 21);
+        $carry15 = ($s15 + (1 << 20)) >> 21;
+        $s16 += $carry15;
+        $s15 -= $carry15 << 21;
+
+        //    s5 += s17 * 666643;
+        //    s6 += s17 * 470296;
+        //    s7 += s17 * 654183;
+        //    s8 -= s17 * 997805;
+        //    s9 += s17 * 136657;
+        //    s10 -= s17 * 683901;
+        $s5 += self::mul($s17, 666643, 20);
+        $s6 += self::mul($s17, 470296, 19);
+        $s7 += self::mul($s17, 654183, 20);
+        $s8 -= self::mul($s17, 997805, 20);
+        $s9 += self::mul($s17, 136657, 18);
+        $s10 -= self::mul($s17, 683901, 20);
+
+        //    s4 += s16 * 666643;
+        //    s5 += s16 * 470296;
+        //    s6 += s16 * 654183;
+        //    s7 -= s16 * 997805;
+        //    s8 += s16 * 136657;
+        //    s9 -= s16 * 683901;
+        $s4 += self::mul($s16, 666643, 20);
+        $s5 += self::mul($s16, 470296, 19);
+        $s6 += self::mul($s16, 654183, 20);
+        $s7 -= self::mul($s16, 997805, 20);
+        $s8 += self::mul($s16, 136657, 18);
+        $s9 -= self::mul($s16, 683901, 20);
+
+        //    s3 += s15 * 666643;
+        //    s4 += s15 * 470296;
+        //    s5 += s15 * 654183;
+        //    s6 -= s15 * 997805;
+        //    s7 += s15 * 136657;
+        //    s8 -= s15 * 683901;
+        $s3 += self::mul($s15, 666643, 20);
+        $s4 += self::mul($s15, 470296, 19);
+        $s5 += self::mul($s15, 654183, 20);
+        $s6 -= self::mul($s15, 997805, 20);
+        $s7 += self::mul($s15, 136657, 18);
+        $s8 -= self::mul($s15, 683901, 20);
+
+        //    s2 += s14 * 666643;
+        //    s3 += s14 * 470296;
+        //    s4 += s14 * 654183;
+        //    s5 -= s14 * 997805;
+        //    s6 += s14 * 136657;
+        //    s7 -= s14 * 683901;
+        $s2 += self::mul($s14, 666643, 20);
+        $s3 += self::mul($s14, 470296, 19);
+        $s4 += self::mul($s14, 654183, 20);
+        $s5 -= self::mul($s14, 997805, 20);
+        $s6 += self::mul($s14, 136657, 18);
+        $s7 -= self::mul($s14, 683901, 20);
+
+        //    s1 += s13 * 666643;
+        //    s2 += s13 * 470296;
+        //    s3 += s13 * 654183;
+        //    s4 -= s13 * 997805;
+        //    s5 += s13 * 136657;
+        //    s6 -= s13 * 683901;
+        $s1 += self::mul($s13, 666643, 20);
+        $s2 += self::mul($s13, 470296, 19);
+        $s3 += self::mul($s13, 654183, 20);
+        $s4 -= self::mul($s13, 997805, 20);
+        $s5 += self::mul($s13, 136657, 18);
+        $s6 -= self::mul($s13, 683901, 20);
+
+        //    s0 += s12 * 666643;
+        //    s1 += s12 * 470296;
+        //    s2 += s12 * 654183;
+        //    s3 -= s12 * 997805;
+        //    s4 += s12 * 136657;
+        //    s5 -= s12 * 683901;
+        //    s12 = 0;
+        $s0 += self::mul($s12, 666643, 20);
+        $s1 += self::mul($s12, 470296, 19);
+        $s2 += self::mul($s12, 654183, 20);
+        $s3 -= self::mul($s12, 997805, 20);
+        $s4 += self::mul($s12, 136657, 18);
+        $s5 -= self::mul($s12, 683901, 20);
+        $s12 = 0;
+
+        //    carry0 = (s0 + (int64_t) (1L << 20)) >> 21;
+        //    s1 += carry0;
+        //    s0 -= carry0 * ((uint64_t) 1L << 21);
+        $carry0 = ($s0 + (1 << 20)) >> 21;
+        $s1 += $carry0;
+        $s0 -= $carry0 << 21;
+        //    carry2 = (s2 + (int64_t) (1L << 20)) >> 21;
+        //    s3 += carry2;
+        //    s2 -= carry2 * ((uint64_t) 1L << 21);
+        $carry2 = ($s2 + (1 << 20)) >> 21;
+        $s3 += $carry2;
+        $s2 -= $carry2 << 21;
+        //    carry4 = (s4 + (int64_t) (1L << 20)) >> 21;
+        //    s5 += carry4;
+        //    s4 -= carry4 * ((uint64_t) 1L << 21);
+        $carry4 = ($s4 + (1 << 20)) >> 21;
+        $s5 += $carry4;
+        $s4 -= $carry4 << 21;
+        //    carry6 = (s6 + (int64_t) (1L << 20)) >> 21;
+        //    s7 += carry6;
+        //    s6 -= carry6 * ((uint64_t) 1L << 21);
+        $carry6 = ($s6 + (1 << 20)) >> 21;
+        $s7 += $carry6;
+        $s6 -= $carry6 << 21;
+        //    carry8 = (s8 + (int64_t) (1L << 20)) >> 21;
+        //    s9 += carry8;
+        //    s8 -= carry8 * ((uint64_t) 1L << 21);
+        $carry8 = ($s8 + (1 << 20)) >> 21;
+        $s9 += $carry8;
+        $s8 -= $carry8 << 21;
+        //    carry10 = (s10 + (int64_t) (1L << 20)) >> 21;
+        //    s11 += carry10;
+        //    s10 -= carry10 * ((uint64_t) 1L << 21);
+        $carry10 = ($s10 + (1 << 20)) >> 21;
+        $s11 += $carry10;
+        $s10 -= $carry10 << 21;
+
+        //    carry1 = (s1 + (int64_t) (1L << 20)) >> 21;
+        //    s2 += carry1;
+        //    s1 -= carry1 * ((uint64_t) 1L << 21);
+        $carry1 = ($s1 + (1 << 20)) >> 21;
+        $s2 += $carry1;
+        $s1 -= $carry1 << 21;
+        //    carry3 = (s3 + (int64_t) (1L << 20)) >> 21;
+        //    s4 += carry3;
+        //    s3 -= carry3 * ((uint64_t) 1L << 21);
+        $carry3 = ($s3 + (1 << 20)) >> 21;
+        $s4 += $carry3;
+        $s3 -= $carry3 << 21;
+        //    carry5 = (s5 + (int64_t) (1L << 20)) >> 21;
+        //    s6 += carry5;
+        //    s5 -= carry5 * ((uint64_t) 1L << 21);
+        $carry5 = ($s5 + (1 << 20)) >> 21;
+        $s6 += $carry5;
+        $s5 -= $carry5 << 21;
+        //    carry7 = (s7 + (int64_t) (1L << 20)) >> 21;
+        //    s8 += carry7;
+        //    s7 -= carry7 * ((uint64_t) 1L << 21);
+        $carry7 = ($s7 + (1 << 20)) >> 21;
+        $s8 += $carry7;
+        $s7 -= $carry7 << 21;
+        //    carry9 = (s9 + (int64_t) (1L << 20)) >> 21;
+        //    s10 += carry9;
+        //    s9 -= carry9 * ((uint64_t) 1L << 21);
+        $carry9 = ($s9 + (1 << 20)) >> 21;
+        $s10 += $carry9;
+        $s9 -= $carry9 << 21;
+        //    carry11 = (s11 + (int64_t) (1L << 20)) >> 21;
+        //    s12 += carry11;
+        //    s11 -= carry11 * ((uint64_t) 1L << 21);
+        $carry11 = ($s11 + (1 << 20)) >> 21;
+        $s12 += $carry11;
+        $s11 -= $carry11 << 21;
+
+        //    s0 += s12 * 666643;
+        //    s1 += s12 * 470296;
+        //    s2 += s12 * 654183;
+        //    s3 -= s12 * 997805;
+        //    s4 += s12 * 136657;
+        //    s5 -= s12 * 683901;
+        //    s12 = 0;
+        $s0 += self::mul($s12, 666643, 20);
+        $s1 += self::mul($s12, 470296, 19);
+        $s2 += self::mul($s12, 654183, 20);
+        $s3 -= self::mul($s12, 997805, 20);
+        $s4 += self::mul($s12, 136657, 18);
+        $s5 -= self::mul($s12, 683901, 20);
+        $s12 = 0;
+
+        //    carry0 = s0 >> 21;
+        //    s1 += carry0;
+        //    s0 -= carry0 * ((uint64_t) 1L << 21);
+        $carry0 = $s0 >> 21;
+        $s1 += $carry0;
+        $s0 -= $carry0 << 21;
+        //    carry1 = s1 >> 21;
+        //    s2 += carry1;
+        //    s1 -= carry1 * ((uint64_t) 1L << 21);
+        $carry1 = $s1 >> 21;
+        $s2 += $carry1;
+        $s1 -= $carry1 << 21;
+        //    carry2 = s2 >> 21;
+        //    s3 += carry2;
+        //    s2 -= carry2 * ((uint64_t) 1L << 21);
+        $carry2 = $s2 >> 21;
+        $s3 += $carry2;
+        $s2 -= $carry2 << 21;
+        //    carry3 = s3 >> 21;
+        //    s4 += carry3;
+        //    s3 -= carry3 * ((uint64_t) 1L << 21);
+        $carry3 = $s3 >> 21;
+        $s4 += $carry3;
+        $s3 -= $carry3 << 21;
+        //    carry4 = s4 >> 21;
+        //    s5 += carry4;
+        //    s4 -= carry4 * ((uint64_t) 1L << 21);
+        $carry4 = $s4 >> 21;
+        $s5 += $carry4;
+        $s4 -= $carry4 << 21;
+        //    carry5 = s5 >> 21;
+        //    s6 += carry5;
+        //    s5 -= carry5 * ((uint64_t) 1L << 21);
+        $carry5 = $s5 >> 21;
+        $s6 += $carry5;
+        $s5 -= $carry5 << 21;
+        //    carry6 = s6 >> 21;
+        //    s7 += carry6;
+        //    s6 -= carry6 * ((uint64_t) 1L << 21);
+        $carry6 = $s6 >> 21;
+        $s7 += $carry6;
+        $s6 -= $carry6 << 21;
+        //    carry7 = s7 >> 21;
+        //    s8 += carry7;
+        //    s7 -= carry7 * ((uint64_t) 1L << 21);
+        $carry7 = $s7 >> 21;
+        $s8 += $carry7;
+        $s7 -= $carry7 << 21;
+        //    carry8 = s8 >> 21;
+        //    s9 += carry8;
+        //    s8 -= carry8 * ((uint64_t) 1L << 21);
+        $carry8 = $s8 >> 21;
+        $s9 += $carry8;
+        $s8 -= $carry8 << 21;
+        //    carry9 = s9 >> 21;
+        //    s10 += carry9;
+        //    s9 -= carry9 * ((uint64_t) 1L << 21);
+        $carry9 = $s9 >> 21;
+        $s10 += $carry9;
+        $s9 -= $carry9 << 21;
+        //    carry10 = s10 >> 21;
+        //    s11 += carry10;
+        //    s10 -= carry10 * ((uint64_t) 1L << 21);
+        $carry10 = $s10 >> 21;
+        $s11 += $carry10;
+        $s10 -= $carry10 << 21;
+        //    carry11 = s11 >> 21;
+        //    s12 += carry11;
+        //    s11 -= carry11 * ((uint64_t) 1L << 21);
+        $carry11 = $s11 >> 21;
+        $s12 += $carry11;
+        $s11 -= $carry11 << 21;
+
+        //    s0 += s12 * 666643;
+        //    s1 += s12 * 470296;
+        //    s2 += s12 * 654183;
+        //    s3 -= s12 * 997805;
+        //    s4 += s12 * 136657;
+        //    s5 -= s12 * 683901;
+        $s0 += self::mul($s12, 666643, 20);
+        $s1 += self::mul($s12, 470296, 19);
+        $s2 += self::mul($s12, 654183, 20);
+        $s3 -= self::mul($s12, 997805, 20);
+        $s4 += self::mul($s12, 136657, 18);
+        $s5 -= self::mul($s12, 683901, 20);
+
+        //    carry0 = s0 >> 21;
+        //    s1 += carry0;
+        //    s0 -= carry0 * ((uint64_t) 1L << 21);
+        $carry0 = $s0 >> 21;
+        $s1 += $carry0;
+        $s0 -= $carry0 << 21;
+        //    carry1 = s1 >> 21;
+        //    s2 += carry1;
+        //    s1 -= carry1 * ((uint64_t) 1L << 21);
+        $carry1 = $s1 >> 21;
+        $s2 += $carry1;
+        $s1 -= $carry1 << 21;
+        //    carry2 = s2 >> 21;
+        //    s3 += carry2;
+        //    s2 -= carry2 * ((uint64_t) 1L << 21);
+        $carry2 = $s2 >> 21;
+        $s3 += $carry2;
+        $s2 -= $carry2 << 21;
+        //    carry3 = s3 >> 21;
+        //    s4 += carry3;
+        //    s3 -= carry3 * ((uint64_t) 1L << 21);
+        $carry3 = $s3 >> 21;
+        $s4 += $carry3;
+        $s3 -= $carry3 << 21;
+        //    carry4 = s4 >> 21;
+        //    s5 += carry4;
+        //    s4 -= carry4 * ((uint64_t) 1L << 21);
+        $carry4 = $s4 >> 21;
+        $s5 += $carry4;
+        $s4 -= $carry4 << 21;
+        //    carry5 = s5 >> 21;
+        //    s6 += carry5;
+        //    s5 -= carry5 * ((uint64_t) 1L << 21);
+        $carry5 = $s5 >> 21;
+        $s6 += $carry5;
+        $s5 -= $carry5 << 21;
+        //    carry6 = s6 >> 21;
+        //    s7 += carry6;
+        //    s6 -= carry6 * ((uint64_t) 1L << 21);
+        $carry6 = $s6 >> 21;
+        $s7 += $carry6;
+        $s6 -= $carry6 << 21;
+        //    carry7 = s7 >> 21;
+        //    s8 += carry7;
+        //    s7 -= carry7 * ((uint64_t) 1L << 21);
+        $carry7 = $s7 >> 21;
+        $s8 += $carry7;
+        $s7 -= $carry7 << 21;
+        //    carry8 = s8 >> 21;
+        //    s9 += carry8;
+        //    s8 -= carry8 * ((uint64_t) 1L << 21);
+        $carry8 = $s8 >> 21;
+        $s9 += $carry8;
+        $s8 -= $carry8 << 21;
+        //    carry9 = s9 >> 21;
+        //    s10 += carry9;
+        //    s9 -= carry9 * ((uint64_t) 1L << 21);
+        $carry9 = $s9 >> 21;
+        $s10 += $carry9;
+        $s9 -= $carry9 << 21;
+        //    carry10 = s10 >> 21;
+        //    s11 += carry10;
+        //    s10 -= carry10 * ((uint64_t) 1L << 21);
+        $carry10 = $s10 >> 21;
+        $s11 += $carry10;
+        $s10 -= $carry10 << 21;
+
+        $s = array_fill(0, 32, 0);
+        // s[0]  = s0 >> 0;
+        $s[0]  = $s0 >> 0;
+        // s[1]  = s0 >> 8;
+        $s[1]  = $s0 >> 8;
+        // s[2]  = (s0 >> 16) | (s1 * ((uint64_t) 1 << 5));
+        $s[2]  = ($s0 >> 16) | ($s1 << 5);
+        // s[3]  = s1 >> 3;
+        $s[3]  = $s1 >> 3;
+        // s[4]  = s1 >> 11;
+        $s[4]  = $s1 >> 11;
+        // s[5]  = (s1 >> 19) | (s2 * ((uint64_t) 1 << 2));
+        $s[5]  = ($s1 >> 19) | ($s2 << 2);
+        // s[6]  = s2 >> 6;
+        $s[6]  = $s2 >> 6;
+        // s[7]  = (s2 >> 14) | (s3 * ((uint64_t) 1 << 7));
+        $s[7]  = ($s2 >> 14) | ($s3 << 7);
+        // s[8]  = s3 >> 1;
+        $s[8]  = $s3 >> 1;
+        // s[9]  = s3 >> 9;
+        $s[9]  = $s3 >> 9;
+        // s[10] = (s3 >> 17) | (s4 * ((uint64_t) 1 << 4));
+        $s[10] = ($s3 >> 17) | ($s4 << 4);
+        // s[11] = s4 >> 4;
+        $s[11] = $s4 >> 4;
+        // s[12] = s4 >> 12;
+        $s[12] = $s4 >> 12;
+        // s[13] = (s4 >> 20) | (s5 * ((uint64_t) 1 << 1));
+        $s[13] = ($s4 >> 20) | ($s5 << 1);
+        // s[14] = s5 >> 7;
+        $s[14] = $s5 >> 7;
+        // s[15] = (s5 >> 15) | (s6 * ((uint64_t) 1 << 6));
+        $s[15] = ($s5 >> 15) | ($s6 << 6);
+        // s[16] = s6 >> 2;
+        $s[16] = $s6 >> 2;
+        // s[17] = s6 >> 10;
+        $s[17] = $s6 >> 10;
+        // s[18] = (s6 >> 18) | (s7 * ((uint64_t) 1 << 3));
+        $s[18] = ($s6 >> 18) | ($s7 << 3);
+        // s[19] = s7 >> 5;
+        $s[19] = $s7 >> 5;
+        // s[20] = s7 >> 13;
+        $s[20] = $s7 >> 13;
+        // s[21] = s8 >> 0;
+        $s[21] = $s8 >> 0;
+        // s[22] = s8 >> 8;
+        $s[22] = $s8 >> 8;
+        // s[23] = (s8 >> 16) | (s9 * ((uint64_t) 1 << 5));
+        $s[23] = ($s8 >> 16) | ($s9 << 5);
+        // s[24] = s9 >> 3;
+        $s[24] = $s9 >> 3;
+        // s[25] = s9 >> 11;
+        $s[25] = $s9 >> 11;
+        // s[26] = (s9 >> 19) | (s10 * ((uint64_t) 1 << 2));
+        $s[26] = ($s9 >> 19) | ($s10 << 2);
+        // s[27] = s10 >> 6;
+        $s[27] = $s10 >> 6;
+        // s[28] = (s10 >> 14) | (s11 * ((uint64_t) 1 << 7));
+        $s[28] = ($s10 >> 14) | ($s11 << 7);
+        // s[29] = s11 >> 1;
+        $s[29] = $s11 >> 1;
+        // s[30] = s11 >> 9;
+        $s[30] = $s11 >> 9;
+        // s[31] = s11 >> 17;
+        $s[31] = $s11 >> 17;
+        return self::intArrayToString($s);
+    }
+
+    /**
+     * @param string $s
+     * @return string
+     */
+    public static function sc25519_sq($s)
+    {
+        return self::sc25519_mul($s, $s);
+    }
+
+    /**
+     * @param string $s
+     * @param int $n
+     * @param string $a
+     * @return string
+     */
+    public static function sc25519_sqmul($s, $n, $a)
+    {
+        for ($i = 0; $i < $n; ++$i) {
+            $s = self::sc25519_sq($s);
+        }
+        return self::sc25519_mul($s, $a);
+    }
+
+    /**
+     * @param string $s
+     * @return string
+     */
+    public static function sc25519_invert($s)
+    {
+        $_10 = self::sc25519_sq($s);
+        $_11 = self::sc25519_mul($s, $_10);
+        $_100 = self::sc25519_mul($s, $_11);
+        $_1000 = self::sc25519_sq($_100);
+        $_1010 = self::sc25519_mul($_10, $_1000);
+        $_1011 = self::sc25519_mul($s, $_1010);
+        $_10000 = self::sc25519_sq($_1000);
+        $_10110 = self::sc25519_sq($_1011);
+        $_100000 = self::sc25519_mul($_1010, $_10110);
+        $_100110 = self::sc25519_mul($_10000, $_10110);
+        $_1000000 = self::sc25519_sq($_100000);
+        $_1010000 = self::sc25519_mul($_10000, $_1000000);
+        $_1010011 = self::sc25519_mul($_11, $_1010000);
+        $_1100011 = self::sc25519_mul($_10000, $_1010011);
+        $_1100111 = self::sc25519_mul($_100, $_1100011);
+        $_1101011 = self::sc25519_mul($_100, $_1100111);
+        $_10010011 = self::sc25519_mul($_1000000, $_1010011);
+        $_10010111 = self::sc25519_mul($_100, $_10010011);
+        $_10111101 = self::sc25519_mul($_100110, $_10010111);
+        $_11010011 = self::sc25519_mul($_10110, $_10111101);
+        $_11100111 = self::sc25519_mul($_1010000, $_10010111);
+        $_11101011 = self::sc25519_mul($_100, $_11100111);
+        $_11110101 = self::sc25519_mul($_1010, $_11101011);
+
+        $recip = self::sc25519_mul($_1011, $_11110101);
+        $recip = self::sc25519_sqmul($recip, 126, $_1010011);
+        $recip = self::sc25519_sqmul($recip, 9, $_10);
+        $recip = self::sc25519_mul($recip, $_11110101);
+        $recip = self::sc25519_sqmul($recip, 7, $_1100111);
+        $recip = self::sc25519_sqmul($recip, 9, $_11110101);
+        $recip = self::sc25519_sqmul($recip, 11, $_10111101);
+        $recip = self::sc25519_sqmul($recip, 8, $_11100111);
+        $recip = self::sc25519_sqmul($recip, 9, $_1101011);
+        $recip = self::sc25519_sqmul($recip, 6, $_1011);
+        $recip = self::sc25519_sqmul($recip, 14, $_10010011);
+        $recip = self::sc25519_sqmul($recip, 10, $_1100011);
+        $recip = self::sc25519_sqmul($recip, 9, $_10010111);
+        $recip = self::sc25519_sqmul($recip, 10, $_11110101);
+        $recip = self::sc25519_sqmul($recip, 8, $_11010011);
+        return self::sc25519_sqmul($recip, 8, $_11101011);
+    }
+
+    /**
+     * @param string $s
+     * @return string
+     */
+    public static function clamp($s)
+    {
+        $s_ = self::stringToIntArray($s);
+        $s_[0] &= 248;
+        $s_[31] |= 64;
+        $s_[31] &= 128;
+        return self::intArrayToString($s_);
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core/Curve25519/Fe.php b/vendor/paragonie/sodium_compat/src/Core/Curve25519/Fe.php
new file mode 100644
index 0000000..64c489a
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core/Curve25519/Fe.php
@@ -0,0 +1,123 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core_Curve25519_Fe', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core_Curve25519_Fe
+ *
+ * This represents a Field Element
+ */
+class ParagonIE_Sodium_Core_Curve25519_Fe implements ArrayAccess
+{
+    /**
+     * @var array<int, int>
+     */
+    protected $container = array();
+
+    /**
+     * @var int
+     */
+    protected $size = 10;
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param array<int, int> $array
+     * @param bool $save_indexes
+     * @return self
+     */
+    public static function fromArray($array, $save_indexes = null)
+    {
+        $count = count($array);
+        if ($save_indexes) {
+            $keys = array_keys($array);
+        } else {
+            $keys = range(0, $count - 1);
+        }
+        $array = array_values($array);
+        /** @var array<int, int> $keys */
+
+        $obj = new ParagonIE_Sodium_Core_Curve25519_Fe();
+        if ($save_indexes) {
+            for ($i = 0; $i < $count; ++$i) {
+                $obj->offsetSet($keys[$i], $array[$i]);
+            }
+        } else {
+            for ($i = 0; $i < $count; ++$i) {
+                $obj->offsetSet($i, $array[$i]);
+            }
+        }
+        return $obj;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param int|null $offset
+     * @param int $value
+     * @return void
+     * @psalm-suppress MixedArrayOffset
+     */
+    public function offsetSet($offset, $value)
+    {
+        if (!is_int($value)) {
+            throw new InvalidArgumentException('Expected an integer');
+        }
+        if (is_null($offset)) {
+            $this->container[] = $value;
+        } else {
+            $this->container[$offset] = $value;
+        }
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param int $offset
+     * @return bool
+     * @psalm-suppress MixedArrayOffset
+     */
+    public function offsetExists($offset)
+    {
+        return isset($this->container[$offset]);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param int $offset
+     * @return void
+     * @psalm-suppress MixedArrayOffset
+     */
+    public function offsetUnset($offset)
+    {
+        unset($this->container[$offset]);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param int $offset
+     * @return int
+     * @psalm-suppress MixedArrayOffset
+     */
+    public function offsetGet($offset)
+    {
+        if (!isset($this->container[$offset])) {
+            $this->container[$offset] = 0;
+        }
+        return (int) ($this->container[$offset]);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @return array
+     */
+    public function __debugInfo()
+    {
+        return array(implode(', ', $this->container));
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core/Curve25519/Ge/Cached.php b/vendor/paragonie/sodium_compat/src/Core/Curve25519/Ge/Cached.php
new file mode 100644
index 0000000..39bf897
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core/Curve25519/Ge/Cached.php
@@ -0,0 +1,65 @@
+<?php
+
+
+if (class_exists('ParagonIE_Sodium_Core_Curve25519_Ge_Cached', false)) {
+    return;
+}
+/**
+ * Class ParagonIE_Sodium_Core_Curve25519_Ge_Cached
+ */
+class ParagonIE_Sodium_Core_Curve25519_Ge_Cached
+{
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $YplusX;
+
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $YminusX;
+
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $Z;
+
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $T2d;
+
+    /**
+     * ParagonIE_Sodium_Core_Curve25519_Ge_Cached constructor.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $YplusX
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $YminusX
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $Z
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $T2d
+     */
+    public function __construct(
+        ParagonIE_Sodium_Core_Curve25519_Fe $YplusX = null,
+        ParagonIE_Sodium_Core_Curve25519_Fe $YminusX = null,
+        ParagonIE_Sodium_Core_Curve25519_Fe $Z = null,
+        ParagonIE_Sodium_Core_Curve25519_Fe $T2d = null
+    ) {
+        if ($YplusX === null) {
+            $YplusX = new ParagonIE_Sodium_Core_Curve25519_Fe();
+        }
+        $this->YplusX = $YplusX;
+        if ($YminusX === null) {
+            $YminusX = new ParagonIE_Sodium_Core_Curve25519_Fe();
+        }
+        $this->YminusX = $YminusX;
+        if ($Z === null) {
+            $Z = new ParagonIE_Sodium_Core_Curve25519_Fe();
+        }
+        $this->Z = $Z;
+        if ($T2d === null) {
+            $T2d = new ParagonIE_Sodium_Core_Curve25519_Fe();
+        }
+        $this->T2d = $T2d;
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core/Curve25519/Ge/P1p1.php b/vendor/paragonie/sodium_compat/src/Core/Curve25519/Ge/P1p1.php
new file mode 100644
index 0000000..a63d6ab
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core/Curve25519/Ge/P1p1.php
@@ -0,0 +1,64 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core_Curve25519_Ge_P1p1', false)) {
+    return;
+}
+/**
+ * Class ParagonIE_Sodium_Core_Curve25519_Ge_P1p1
+ */
+class ParagonIE_Sodium_Core_Curve25519_Ge_P1p1
+{
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $X;
+
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $Y;
+
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $Z;
+
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $T;
+
+    /**
+     * ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 constructor.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $x
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $y
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $z
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $t
+     */
+    public function __construct(
+        ParagonIE_Sodium_Core_Curve25519_Fe $x = null,
+        ParagonIE_Sodium_Core_Curve25519_Fe $y = null,
+        ParagonIE_Sodium_Core_Curve25519_Fe $z = null,
+        ParagonIE_Sodium_Core_Curve25519_Fe $t = null
+    ) {
+        if ($x === null) {
+            $x = new ParagonIE_Sodium_Core_Curve25519_Fe();
+        }
+        $this->X = $x;
+        if ($y === null) {
+            $y = new ParagonIE_Sodium_Core_Curve25519_Fe();
+        }
+        $this->Y = $y;
+        if ($z === null) {
+            $z = new ParagonIE_Sodium_Core_Curve25519_Fe();
+        }
+        $this->Z = $z;
+        if ($t === null) {
+            $t = new ParagonIE_Sodium_Core_Curve25519_Fe();
+        }
+        $this->T = $t;
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core/Curve25519/Ge/P2.php b/vendor/paragonie/sodium_compat/src/Core/Curve25519/Ge/P2.php
new file mode 100644
index 0000000..aee4000
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core/Curve25519/Ge/P2.php
@@ -0,0 +1,54 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core_Curve25519_Ge_P2', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core_Curve25519_Ge_P2
+ */
+class ParagonIE_Sodium_Core_Curve25519_Ge_P2
+{
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $X;
+
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $Y;
+
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $Z;
+
+    /**
+     * ParagonIE_Sodium_Core_Curve25519_Ge_P2 constructor.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $x
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $y
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $z
+     */
+    public function __construct(
+        ParagonIE_Sodium_Core_Curve25519_Fe $x = null,
+        ParagonIE_Sodium_Core_Curve25519_Fe $y = null,
+        ParagonIE_Sodium_Core_Curve25519_Fe $z = null
+    ) {
+        if ($x === null) {
+            $x = new ParagonIE_Sodium_Core_Curve25519_Fe();
+        }
+        $this->X = $x;
+        if ($y === null) {
+            $y = new ParagonIE_Sodium_Core_Curve25519_Fe();
+        }
+        $this->Y = $y;
+        if ($z === null) {
+            $z = new ParagonIE_Sodium_Core_Curve25519_Fe();
+        }
+        $this->Z = $z;
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core/Curve25519/Ge/P3.php b/vendor/paragonie/sodium_compat/src/Core/Curve25519/Ge/P3.php
new file mode 100644
index 0000000..00f5b27
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core/Curve25519/Ge/P3.php
@@ -0,0 +1,65 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core_Curve25519_Ge_P3', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core_Curve25519_Ge_P3
+ */
+class ParagonIE_Sodium_Core_Curve25519_Ge_P3
+{
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $X;
+
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $Y;
+
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $Z;
+
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $T;
+
+    /**
+     * ParagonIE_Sodium_Core_Curve25519_Ge_P3 constructor.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $x
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $y
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $z
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $t
+     */
+    public function __construct(
+        ParagonIE_Sodium_Core_Curve25519_Fe $x = null,
+        ParagonIE_Sodium_Core_Curve25519_Fe $y = null,
+        ParagonIE_Sodium_Core_Curve25519_Fe $z = null,
+        ParagonIE_Sodium_Core_Curve25519_Fe $t = null
+    ) {
+        if ($x === null) {
+            $x = new ParagonIE_Sodium_Core_Curve25519_Fe();
+        }
+        $this->X = $x;
+        if ($y === null) {
+            $y = new ParagonIE_Sodium_Core_Curve25519_Fe();
+        }
+        $this->Y = $y;
+        if ($z === null) {
+            $z = new ParagonIE_Sodium_Core_Curve25519_Fe();
+        }
+        $this->Z = $z;
+        if ($t === null) {
+            $t = new ParagonIE_Sodium_Core_Curve25519_Fe();
+        }
+        $this->T = $t;
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core/Curve25519/Ge/Precomp.php b/vendor/paragonie/sodium_compat/src/Core/Curve25519/Ge/Precomp.php
new file mode 100644
index 0000000..59611c1
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core/Curve25519/Ge/Precomp.php
@@ -0,0 +1,54 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core_Curve25519_Ge_Precomp', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core_Curve25519_Ge_Precomp
+ */
+class ParagonIE_Sodium_Core_Curve25519_Ge_Precomp
+{
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $yplusx;
+
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $yminusx;
+
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $xy2d;
+
+    /**
+     * ParagonIE_Sodium_Core_Curve25519_Ge_Precomp constructor.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $yplusx
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $yminusx
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $xy2d
+     */
+    public function __construct(
+        ParagonIE_Sodium_Core_Curve25519_Fe $yplusx = null,
+        ParagonIE_Sodium_Core_Curve25519_Fe $yminusx = null,
+        ParagonIE_Sodium_Core_Curve25519_Fe $xy2d = null
+    ) {
+        if ($yplusx === null) {
+            $yplusx = new ParagonIE_Sodium_Core_Curve25519_Fe();
+        }
+        $this->yplusx = $yplusx;
+        if ($yminusx === null) {
+            $yminusx = new ParagonIE_Sodium_Core_Curve25519_Fe();
+        }
+        $this->yminusx = $yminusx;
+        if ($xy2d === null) {
+            $xy2d = new ParagonIE_Sodium_Core_Curve25519_Fe();
+        }
+        $this->xy2d = $xy2d;
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core/Curve25519/H.php b/vendor/paragonie/sodium_compat/src/Core/Curve25519/H.php
new file mode 100644
index 0000000..adab63e
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core/Curve25519/H.php
@@ -0,0 +1,1549 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core_Curve25519_H', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core_Curve25519_H
+ *
+ * This just contains the constants in the ref10/base.h file
+ */
+class ParagonIE_Sodium_Core_Curve25519_H extends ParagonIE_Sodium_Core_Util
+{
+    /**
+     * See: libsodium's crypto_core/curve25519/ref10/base.h
+     *
+     * @var array<int, array<int, array<int, array<int, int>>>> Basically, int[32][8][3][10]
+     */
+    protected static $base = array(
+        array(
+            array(
+                array(25967493, -14356035, 29566456, 3660896, -12694345, 4014787, 27544626, -11754271, -6079156, 2047605),
+                array(-12545711, 934262, -2722910, 3049990, -727428, 9406986, 12720692, 5043384, 19500929, -15469378),
+                array(-8738181, 4489570, 9688441, -14785194, 10184609, -12363380, 29287919, 11864899, -24514362, -4438546),
+            ),
+            array(
+                array(-12815894, -12976347, -21581243, 11784320, -25355658, -2750717, -11717903, -3814571, -358445, -10211303),
+                array(-21703237, 6903825, 27185491, 6451973, -29577724, -9554005, -15616551, 11189268, -26829678, -5319081),
+                array(26966642, 11152617, 32442495, 15396054, 14353839, -12752335, -3128826, -9541118, -15472047, -4166697),
+            ),
+            array(
+                array(15636291, -9688557, 24204773, -7912398, 616977, -16685262, 27787600, -14772189, 28944400, -1550024),
+                array(16568933, 4717097, -11556148, -1102322, 15682896, -11807043, 16354577, -11775962, 7689662, 11199574),
+                array(30464156, -5976125, -11779434, -15670865, 23220365, 15915852, 7512774, 10017326, -17749093, -9920357),
+            ),
+            array(
+                array(-17036878, 13921892, 10945806, -6033431, 27105052, -16084379, -28926210, 15006023, 3284568, -6276540),
+                array(23599295, -8306047, -11193664, -7687416, 13236774, 10506355, 7464579, 9656445, 13059162, 10374397),
+                array(7798556, 16710257, 3033922, 2874086, 28997861, 2835604, 32406664, -3839045, -641708, -101325),
+            ),
+            array(
+                array(10861363, 11473154, 27284546, 1981175, -30064349, 12577861, 32867885, 14515107, -15438304, 10819380),
+                array(4708026, 6336745, 20377586, 9066809, -11272109, 6594696, -25653668, 12483688, -12668491, 5581306),
+                array(19563160, 16186464, -29386857, 4097519, 10237984, -4348115, 28542350, 13850243, -23678021, -15815942),
+            ),
+            array(
+                array(-15371964, -12862754, 32573250, 4720197, -26436522, 5875511, -19188627, -15224819, -9818940, -12085777),
+                array(-8549212, 109983, 15149363, 2178705, 22900618, 4543417, 3044240, -15689887, 1762328, 14866737),
+                array(-18199695, -15951423, -10473290, 1707278, -17185920, 3916101, -28236412, 3959421, 27914454, 4383652),
+            ),
+            array(
+                array(5153746, 9909285, 1723747, -2777874, 30523605, 5516873, 19480852, 5230134, -23952439, -15175766),
+                array(-30269007, -3463509, 7665486, 10083793, 28475525, 1649722, 20654025, 16520125, 30598449, 7715701),
+                array(28881845, 14381568, 9657904, 3680757, -20181635, 7843316, -31400660, 1370708, 29794553, -1409300),
+            ),
+            array(
+                array(14499471, -2729599, -33191113, -4254652, 28494862, 14271267, 30290735, 10876454, -33154098, 2381726),
+                array(-7195431, -2655363, -14730155, 462251, -27724326, 3941372, -6236617, 3696005, -32300832, 15351955),
+                array(27431194, 8222322, 16448760, -3907995, -18707002, 11938355, -32961401, -2970515, 29551813, 10109425),
+            ),
+        ),
+        array(
+            array(
+                array(-13657040, -13155431, -31283750, 11777098, 21447386, 6519384, -2378284, -1627556, 10092783, -4764171),
+                array(27939166, 14210322, 4677035, 16277044, -22964462, -12398139, -32508754, 12005538, -17810127, 12803510),
+                array(17228999, -15661624, -1233527, 300140, -1224870, -11714777, 30364213, -9038194, 18016357, 4397660),
+            ),
+            array(
+                array(-10958843, -7690207, 4776341, -14954238, 27850028, -15602212, -26619106, 14544525, -17477504, 982639),
+                array(29253598, 15796703, -2863982, -9908884, 10057023, 3163536, 7332899, -4120128, -21047696, 9934963),
+                array(5793303, 16271923, -24131614, -10116404, 29188560, 1206517, -14747930, 4559895, -30123922, -10897950),
+            ),
+            array(
+                array(-27643952, -11493006, 16282657, -11036493, 28414021, -15012264, 24191034, 4541697, -13338309, 5500568),
+                array(12650548, -1497113, 9052871, 11355358, -17680037, -8400164, -17430592, 12264343, 10874051, 13524335),
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+            ),
+            array(
+                array(-25493081, -6962928, 32500200, -9419051, -23038724, -2302222, 14898637, 3848455, 20969334, -5157516),
+                array(-20384450, -14347713, -18336405, 13884722, -33039454, 2842114, -21610826, -3649888, 11177095, 14989547),
+                array(-24496721, -11716016, 16959896, 2278463, 12066309, 10137771, 13515641, 2581286, -28487508, 9930240),
+            ),
+            array(
+                array(-17751622, -2097826, 16544300, -13009300, -15914807, -14949081, 18345767, -13403753, 16291481, -5314038),
+                array(-33229194, 2553288, 32678213, 9875984, 8534129, 6889387, -9676774, 6957617, 4368891, 9788741),
+                array(16660756, 7281060, -10830758, 12911820, 20108584, -8101676, -21722536, -8613148, 16250552, -11111103),
+            ),
+            array(
+                array(-19765507, 2390526, -16551031, 14161980, 1905286, 6414907, 4689584, 10604807, -30190403, 4782747),
+                array(-1354539, 14736941, -7367442, -13292886, 7710542, -14155590, -9981571, 4383045, 22546403, 437323),
+                array(31665577, -12180464, -16186830, 1491339, -18368625, 3294682, 27343084, 2786261, -30633590, -14097016),
+            ),
+            array(
+                array(-14467279, -683715, -33374107, 7448552, 19294360, 14334329, -19690631, 2355319, -19284671, -6114373),
+                array(15121312, -15796162, 6377020, -6031361, -10798111, -12957845, 18952177, 15496498, -29380133, 11754228),
+                array(-2637277, -13483075, 8488727, -14303896, 12728761, -1622493, 7141596, 11724556, 22761615, -10134141),
+            ),
+            array(
+                array(16918416, 11729663, -18083579, 3022987, -31015732, -13339659, -28741185, -12227393, 32851222, 11717399),
+                array(11166634, 7338049, -6722523, 4531520, -29468672, -7302055, 31474879, 3483633, -1193175, -4030831),
+                array(-185635, 9921305, 31456609, -13536438, -12013818, 13348923, 33142652, 6546660, -19985279, -3948376),
+            ),
+            array(
+                array(-32460596, 11266712, -11197107, -7899103, 31703694, 3855903, -8537131, -12833048, -30772034, -15486313),
+                array(-18006477, 12709068, 3991746, -6479188, -21491523, -10550425, -31135347, -16049879, 10928917, 3011958),
+                array(-6957757, -15594337, 31696059, 334240, 29576716, 14796075, -30831056, -12805180, 18008031, 10258577),
+            ),
+            array(
+                array(-22448644, 15655569, 7018479, -4410003, -30314266, -1201591, -1853465, 1367120, 25127874, 6671743),
+                array(29701166, -14373934, -10878120, 9279288, -17568, 13127210, 21382910, 11042292, 25838796, 4642684),
+                array(-20430234, 14955537, -24126347, 8124619, -5369288, -5990470, 30468147, -13900640, 18423289, 4177476),
+            ),
+        )
+    );
+
+    /**
+     * See: libsodium's crypto_core/curve25519/ref10/base2.h
+     *
+     * @var array basically int[8][3]
+     */
+    protected static $base2 = array(
+        array(
+            array(25967493, -14356035, 29566456, 3660896, -12694345, 4014787, 27544626, -11754271, -6079156, 2047605),
+            array(-12545711, 934262, -2722910, 3049990, -727428, 9406986, 12720692, 5043384, 19500929, -15469378),
+            array(-8738181, 4489570, 9688441, -14785194, 10184609, -12363380, 29287919, 11864899, -24514362, -4438546),
+        ),
+        array(
+            array(15636291, -9688557, 24204773, -7912398, 616977, -16685262, 27787600, -14772189, 28944400, -1550024),
+            array(16568933, 4717097, -11556148, -1102322, 15682896, -11807043, 16354577, -11775962, 7689662, 11199574),
+            array(30464156, -5976125, -11779434, -15670865, 23220365, 15915852, 7512774, 10017326, -17749093, -9920357),
+        ),
+        array(
+            array(10861363, 11473154, 27284546, 1981175, -30064349, 12577861, 32867885, 14515107, -15438304, 10819380),
+            array(4708026, 6336745, 20377586, 9066809, -11272109, 6594696, -25653668, 12483688, -12668491, 5581306),
+            array(19563160, 16186464, -29386857, 4097519, 10237984, -4348115, 28542350, 13850243, -23678021, -15815942),
+        ),
+        array(
+            array(5153746, 9909285, 1723747, -2777874, 30523605, 5516873, 19480852, 5230134, -23952439, -15175766),
+            array(-30269007, -3463509, 7665486, 10083793, 28475525, 1649722, 20654025, 16520125, 30598449, 7715701),
+            array(28881845, 14381568, 9657904, 3680757, -20181635, 7843316, -31400660, 1370708, 29794553, -1409300),
+        ),
+        array(
+            array(-22518993, -6692182, 14201702, -8745502, -23510406, 8844726, 18474211, -1361450, -13062696, 13821877),
+            array(-6455177, -7839871, 3374702, -4740862, -27098617, -10571707, 31655028, -7212327, 18853322, -14220951),
+            array(4566830, -12963868, -28974889, -12240689, -7602672, -2830569, -8514358, -10431137, 2207753, -3209784),
+        ),
+        array(
+            array(-25154831, -4185821, 29681144, 7868801, -6854661, -9423865, -12437364, -663000, -31111463, -16132436),
+            array(25576264, -2703214, 7349804, -11814844, 16472782, 9300885, 3844789, 15725684, 171356, 6466918),
+            array(23103977, 13316479, 9739013, -16149481, 817875, -15038942, 8965339, -14088058, -30714912, 16193877),
+        ),
+        array(
+            array(-33521811, 3180713, -2394130, 14003687, -16903474, -16270840, 17238398, 4729455, -18074513, 9256800),
+            array(-25182317, -4174131, 32336398, 5036987, -21236817, 11360617, 22616405, 9761698, -19827198, 630305),
+            array(-13720693, 2639453, -24237460, -7406481, 9494427, -5774029, -6554551, -15960994, -2449256, -14291300),
+        ),
+        array(
+            array(-3151181, -5046075, 9282714, 6866145, -31907062, -863023, -18940575, 15033784, 25105118, -7894876),
+            array(-24326370, 15950226, -31801215, -14592823, -11662737, -5090925, 1573892, -2625887, 2198790, -15804619),
+            array(-3099351, 10324967, -2241613, 7453183, -5446979, -2735503, -13812022, -16236442, -32461234, -12290683),
+        )
+    );
+
+    /**
+     * 37095705934669439343138083508754565189542113879843219016388785533085940283555
+     *
+     * @var array<int, int>
+     */
+    protected static $d = array(
+        -10913610,
+        13857413,
+        -15372611,
+        6949391,
+        114729,
+        -8787816,
+        -6275908,
+        -3247719,
+        -18696448,
+        -12055116
+    );
+
+    /**
+     * 2 * d = 16295367250680780974490674513165176452449235426866156013048779062215315747161
+     *
+     * @var array<int, int>
+     */
+    protected static $d2 = array(
+        -21827239,
+        -5839606,
+        -30745221,
+        13898782,
+        229458,
+        15978800,
+        -12551817,
+        -6495438,
+        29715968,
+        9444199
+    );
+
+    /**
+     * sqrt(-1)
+     *
+     * @var array<int, int>
+     */
+    protected static $sqrtm1 = array(
+        -32595792,
+        -7943725,
+        9377950,
+        3500415,
+        12389472,
+        -272473,
+        -25146209,
+        -2005654,
+        326686,
+        11406482
+    );
+
+    /**
+     * 1 / sqrt(a - d)
+     *
+     * @var array<int, int>
+     */
+    protected static $invsqrtamd = array(
+        6111485,
+        4156064,
+        -27798727,
+        12243468,
+        -25904040,
+        120897,
+        20826367,
+        -7060776,
+        6093568,
+        -1986012
+    );
+
+    /**
+     *  sqrt(ad - 1) with a = -1 (mod p)
+     *
+     * @var array<int, int>
+     */
+    protected static $sqrtadm1 = array(
+        24849947,
+        -153582,
+        -23613485,
+        6347715,
+        -21072328,
+        -667138,
+        -25271143,
+        -15367704,
+        -870347,
+        14525639
+    );
+
+    /**
+     * 1 - d ^ 2
+     *
+     * @var array<int, int>
+     */
+    protected static $onemsqd = array(
+        6275446,
+        -16617371,
+        -22938544,
+        -3773710,
+        11667077,
+        7397348,
+        -27922721,
+        1766195,
+        -24433858,
+        672203
+    );
+
+    /**
+     * (d - 1) ^ 2
+     * @var array<int, int>
+     */
+    protected static $sqdmone = array(
+        15551795,
+        -11097455,
+        -13425098,
+        -10125071,
+        -11896535,
+        10178284,
+        -26634327,
+        4729244,
+        -5282110,
+        -10116402
+    );
+
+
+    /*
+     *  2^252+27742317777372353535851937790883648493
+        static const unsigned char L[] = {
+            0xed, 0xd3, 0xf5, 0x5c, 0x1a, 0x63, 0x12, 0x58, 0xd6, 0x9c, 0xf7,
+            0xa2, 0xde, 0xf9, 0xde, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10
+        };
+    */
+    const L = "\xed\xd3\xf5\x5c\x1a\x63\x12\x58\xd6\x9c\xf7\xa2\xde\xf9\xde\x14\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x10";
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core/Curve25519/README.md b/vendor/paragonie/sodium_compat/src/Core/Curve25519/README.md
new file mode 100644
index 0000000..e8097fa
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core/Curve25519/README.md
@@ -0,0 +1,3 @@
+# Curve25519 Data Structures
+
+These are PHP implementation of the [structs used in the ref10 curve25519 code](https://github.com/jedisct1/libsodium/blob/master/src/libsodium/include/sodium/private/curve25519_ref10.h).
diff --git a/vendor/paragonie/sodium_compat/src/Core/Ed25519.php b/vendor/paragonie/sodium_compat/src/Core/Ed25519.php
new file mode 100644
index 0000000..c29f493
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core/Ed25519.php
@@ -0,0 +1,551 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core_Ed25519', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core_Ed25519
+ */
+abstract class ParagonIE_Sodium_Core_Ed25519 extends ParagonIE_Sodium_Core_Curve25519
+{
+    const KEYPAIR_BYTES = 96;
+    const SEED_BYTES = 32;
+    const SCALAR_BYTES = 32;
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @return string (96 bytes)
+     * @throws Exception
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function keypair()
+    {
+        $seed = random_bytes(self::SEED_BYTES);
+        $pk = '';
+        $sk = '';
+        self::seed_keypair($pk, $sk, $seed);
+        return $sk . $pk;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $pk
+     * @param string $sk
+     * @param string $seed
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function seed_keypair(&$pk, &$sk, $seed)
+    {
+        if (self::strlen($seed) !== self::SEED_BYTES) {
+            throw new RangeException('crypto_sign keypair seed must be 32 bytes long');
+        }
+
+        /** @var string $pk */
+        $pk = self::publickey_from_secretkey($seed);
+        $sk = $seed . $pk;
+        return $sk;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $keypair
+     * @return string
+     * @throws TypeError
+     */
+    public static function secretkey($keypair)
+    {
+        if (self::strlen($keypair) !== self::KEYPAIR_BYTES) {
+            throw new RangeException('crypto_sign keypair must be 96 bytes long');
+        }
+        return self::substr($keypair, 0, 64);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $keypair
+     * @return string
+     * @throws TypeError
+     */
+    public static function publickey($keypair)
+    {
+        if (self::strlen($keypair) !== self::KEYPAIR_BYTES) {
+            throw new RangeException('crypto_sign keypair must be 96 bytes long');
+        }
+        return self::substr($keypair, 64, 32);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $sk
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function publickey_from_secretkey($sk)
+    {
+        /** @var string $sk */
+        $sk = hash('sha512', self::substr($sk, 0, 32), true);
+        $sk[0] = self::intToChr(
+            self::chrToInt($sk[0]) & 248
+        );
+        $sk[31] = self::intToChr(
+            (self::chrToInt($sk[31]) & 63) | 64
+        );
+        return self::sk_to_pk($sk);
+    }
+
+    /**
+     * @param string $pk
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function pk_to_curve25519($pk)
+    {
+        if (self::small_order($pk)) {
+            throw new SodiumException('Public key is on a small order');
+        }
+        $A = self::ge_frombytes_negate_vartime(self::substr($pk, 0, 32));
+        $p1 = self::ge_mul_l($A);
+        if (!self::fe_isnonzero($p1->X)) {
+            throw new SodiumException('Unexpected zero result');
+        }
+
+        # fe_1(one_minus_y);
+        # fe_sub(one_minus_y, one_minus_y, A.Y);
+        # fe_invert(one_minus_y, one_minus_y);
+        $one_minux_y = self::fe_invert(
+            self::fe_sub(
+                self::fe_1(),
+                $A->Y
+            )
+        );
+
+        # fe_1(x);
+        # fe_add(x, x, A.Y);
+        # fe_mul(x, x, one_minus_y);
+        $x = self::fe_mul(
+            self::fe_add(self::fe_1(), $A->Y),
+            $one_minux_y
+        );
+
+        # fe_tobytes(curve25519_pk, x);
+        return self::fe_tobytes($x);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $sk
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function sk_to_pk($sk)
+    {
+        return self::ge_p3_tobytes(
+            self::ge_scalarmult_base(
+                self::substr($sk, 0, 32)
+            )
+        );
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $message
+     * @param string $sk
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function sign($message, $sk)
+    {
+        /** @var string $signature */
+        $signature = self::sign_detached($message, $sk);
+        return $signature . $message;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $message A signed message
+     * @param string $pk      Public key
+     * @return string         Message (without signature)
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function sign_open($message, $pk)
+    {
+        /** @var string $signature */
+        $signature = self::substr($message, 0, 64);
+
+        /** @var string $message */
+        $message = self::substr($message, 64);
+
+        if (self::verify_detached($signature, $message, $pk)) {
+            return $message;
+        }
+        throw new SodiumException('Invalid signature');
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $message
+     * @param string $sk
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function sign_detached($message, $sk)
+    {
+        # crypto_hash_sha512(az, sk, 32);
+        $az =  hash('sha512', self::substr($sk, 0, 32), true);
+
+        # az[0] &= 248;
+        # az[31] &= 63;
+        # az[31] |= 64;
+        $az[0] = self::intToChr(self::chrToInt($az[0]) & 248);
+        $az[31] = self::intToChr((self::chrToInt($az[31]) & 63) | 64);
+
+        # crypto_hash_sha512_init(&hs);
+        # crypto_hash_sha512_update(&hs, az + 32, 32);
+        # crypto_hash_sha512_update(&hs, m, mlen);
+        # crypto_hash_sha512_final(&hs, nonce);
+        $hs = hash_init('sha512');
+        hash_update($hs, self::substr($az, 32, 32));
+        hash_update($hs, $message);
+        $nonceHash = hash_final($hs, true);
+
+        # memmove(sig + 32, sk + 32, 32);
+        $pk = self::substr($sk, 32, 32);
+
+        # sc_reduce(nonce);
+        # ge_scalarmult_base(&R, nonce);
+        # ge_p3_tobytes(sig, &R);
+        $nonce = self::sc_reduce($nonceHash) . self::substr($nonceHash, 32);
+        $sig = self::ge_p3_tobytes(
+            self::ge_scalarmult_base($nonce)
+        );
+
+        # crypto_hash_sha512_init(&hs);
+        # crypto_hash_sha512_update(&hs, sig, 64);
+        # crypto_hash_sha512_update(&hs, m, mlen);
+        # crypto_hash_sha512_final(&hs, hram);
+        $hs = hash_init('sha512');
+        hash_update($hs, self::substr($sig, 0, 32));
+        hash_update($hs, self::substr($pk, 0, 32));
+        hash_update($hs, $message);
+        $hramHash = hash_final($hs, true);
+
+        # sc_reduce(hram);
+        # sc_muladd(sig + 32, hram, az, nonce);
+        $hram = self::sc_reduce($hramHash);
+        $sigAfter = self::sc_muladd($hram, $az, $nonce);
+        $sig = self::substr($sig, 0, 32) . self::substr($sigAfter, 0, 32);
+
+        try {
+            ParagonIE_Sodium_Compat::memzero($az);
+        } catch (SodiumException $ex) {
+            $az = null;
+        }
+        return $sig;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $sig
+     * @param string $message
+     * @param string $pk
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function verify_detached($sig, $message, $pk)
+    {
+        if (self::strlen($sig) < 64) {
+            throw new SodiumException('Signature is too short');
+        }
+        if ((self::chrToInt($sig[63]) & 240) && self::check_S_lt_L(self::substr($sig, 32, 32))) {
+            throw new SodiumException('S < L - Invalid signature');
+        }
+        if (self::small_order($sig)) {
+            throw new SodiumException('Signature is on too small of an order');
+        }
+        if ((self::chrToInt($sig[63]) & 224) !== 0) {
+            throw new SodiumException('Invalid signature');
+        }
+        $d = 0;
+        for ($i = 0; $i < 32; ++$i) {
+            $d |= self::chrToInt($pk[$i]);
+        }
+        if ($d === 0) {
+            throw new SodiumException('All zero public key');
+        }
+
+        /** @var bool The original value of ParagonIE_Sodium_Compat::$fastMult */
+        $orig = ParagonIE_Sodium_Compat::$fastMult;
+
+        // Set ParagonIE_Sodium_Compat::$fastMult to true to speed up verification.
+        ParagonIE_Sodium_Compat::$fastMult = true;
+
+        /** @var ParagonIE_Sodium_Core_Curve25519_Ge_P3 $A */
+        $A = self::ge_frombytes_negate_vartime($pk);
+
+        /** @var string $hDigest */
+        $hDigest = hash(
+            'sha512',
+            self::substr($sig, 0, 32) .
+                self::substr($pk, 0, 32) .
+                $message,
+            true
+        );
+
+        /** @var string $h */
+        $h = self::sc_reduce($hDigest) . self::substr($hDigest, 32);
+
+        /** @var ParagonIE_Sodium_Core_Curve25519_Ge_P2 $R */
+        $R = self::ge_double_scalarmult_vartime(
+            $h,
+            $A,
+            self::substr($sig, 32)
+        );
+
+        /** @var string $rcheck */
+        $rcheck = self::ge_tobytes($R);
+
+        // Reset ParagonIE_Sodium_Compat::$fastMult to what it was before.
+        ParagonIE_Sodium_Compat::$fastMult = $orig;
+
+        return self::verify_32($rcheck, self::substr($sig, 0, 32));
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $S
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function check_S_lt_L($S)
+    {
+        if (self::strlen($S) < 32) {
+            throw new SodiumException('Signature must be 32 bytes');
+        }
+        $L = array(
+            0xed, 0xd3, 0xf5, 0x5c, 0x1a, 0x63, 0x12, 0x58,
+            0xd6, 0x9c, 0xf7, 0xa2, 0xde, 0xf9, 0xde, 0x14,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10
+        );
+        $c = 0;
+        $n = 1;
+        $i = 32;
+
+        /** @var array<int, int> $L */
+        do {
+            --$i;
+            $x = self::chrToInt($S[$i]);
+            $c |= (
+                (($x - $L[$i]) >> 8) & $n
+            );
+            $n &= (
+                (($x ^ $L[$i]) - 1) >> 8
+            );
+        } while ($i !== 0);
+
+        return $c === 0;
+    }
+
+    /**
+     * @param string $R
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function small_order($R)
+    {
+        /** @var array<int, array<int, int>> $blocklist */
+        $blocklist = array(
+            /* 0 (order 4) */
+            array(
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+            ),
+            /* 1 (order 1) */
+            array(
+                0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+            ),
+            /* 2707385501144840649318225287225658788936804267575313519463743609750303402022 (order 8) */
+            array(
+                0x26, 0xe8, 0x95, 0x8f, 0xc2, 0xb2, 0x27, 0xb0,
+                0x45, 0xc3, 0xf4, 0x89, 0xf2, 0xef, 0x98, 0xf0,
+                0xd5, 0xdf, 0xac, 0x05, 0xd3, 0xc6, 0x33, 0x39,
+                0xb1, 0x38, 0x02, 0x88, 0x6d, 0x53, 0xfc, 0x05
+            ),
+            /* 55188659117513257062467267217118295137698188065244968500265048394206261417927 (order 8) */
+            array(
+                0xc7, 0x17, 0x6a, 0x70, 0x3d, 0x4d, 0xd8, 0x4f,
+                0xba, 0x3c, 0x0b, 0x76, 0x0d, 0x10, 0x67, 0x0f,
+                0x2a, 0x20, 0x53, 0xfa, 0x2c, 0x39, 0xcc, 0xc6,
+                0x4e, 0xc7, 0xfd, 0x77, 0x92, 0xac, 0x03, 0x7a
+            ),
+            /* p-1 (order 2) */
+            array(
+                0x13, 0xe8, 0x95, 0x8f, 0xc2, 0xb2, 0x27, 0xb0,
+                0x45, 0xc3, 0xf4, 0x89, 0xf2, 0xef, 0x98, 0xf0,
+                0xd5, 0xdf, 0xac, 0x05, 0xd3, 0xc6, 0x33, 0x39,
+                0xb1, 0x38, 0x02, 0x88, 0x6d, 0x53, 0xfc, 0x85
+            ),
+            /* p (order 4) */
+            array(
+                0xb4, 0x17, 0x6a, 0x70, 0x3d, 0x4d, 0xd8, 0x4f,
+                0xba, 0x3c, 0x0b, 0x76, 0x0d, 0x10, 0x67, 0x0f,
+                0x2a, 0x20, 0x53, 0xfa, 0x2c, 0x39, 0xcc, 0xc6,
+                0x4e, 0xc7, 0xfd, 0x77, 0x92, 0xac, 0x03, 0xfa
+            ),
+            /* p+1 (order 1) */
+            array(
+                0xec, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f
+            ),
+            /* p+2707385501144840649318225287225658788936804267575313519463743609750303402022 (order 8) */
+            array(
+                0xed, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f
+            ),
+            /* p+55188659117513257062467267217118295137698188065244968500265048394206261417927 (order 8) */
+            array(
+                0xee, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f
+            ),
+            /* 2p-1 (order 2) */
+            array(
+                0xd9, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
+            ),
+            /* 2p (order 4) */
+            array(
+                0xda, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
+            ),
+            /* 2p+1 (order 1) */
+            array(
+                0xdb, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
+            )
+        );
+        /** @var int $countBlocklist */
+        $countBlocklist = count($blocklist);
+
+        for ($i = 0; $i < $countBlocklist; ++$i) {
+            $c = 0;
+            for ($j = 0; $j < 32; ++$j) {
+                $c |= self::chrToInt($R[$j]) ^ (int) $blocklist[$i][$j];
+            }
+            if ($c === 0) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * @param string $s
+     * @return string
+     * @throws SodiumException
+     */
+    public static function scalar_complement($s)
+    {
+        $t_ = self::L . str_repeat("\x00", 32);
+        sodium_increment($t_);
+        $s_ = $s . str_repeat("\x00", 32);
+        ParagonIE_Sodium_Compat::sub($t_, $s_);
+        return self::sc_reduce($t_);
+    }
+
+    /**
+     * @return string
+     * @throws SodiumException
+     */
+    public static function scalar_random()
+    {
+        do {
+            $r = ParagonIE_Sodium_Compat::randombytes_buf(self::SCALAR_BYTES);
+            $r[self::SCALAR_BYTES - 1] = self::intToChr(
+                self::chrToInt($r[self::SCALAR_BYTES - 1]) & 0x1f
+            );
+        } while (
+            !self::check_S_lt_L($r) || ParagonIE_Sodium_Compat::is_zero($r)
+        );
+        return $r;
+    }
+
+    /**
+     * @param string $s
+     * @return string
+     * @throws SodiumException
+     */
+    public static function scalar_negate($s)
+    {
+        $t_ = self::L . str_repeat("\x00", 32) ;
+        $s_ = $s . str_repeat("\x00", 32) ;
+        ParagonIE_Sodium_Compat::sub($t_, $s_);
+        return self::sc_reduce($t_);
+    }
+
+    /**
+     * @param string $a
+     * @param string $b
+     * @return string
+     * @throws SodiumException
+     */
+    public static function scalar_add($a, $b)
+    {
+        $a_ = $a . str_repeat("\x00", 32);
+        $b_ = $b . str_repeat("\x00", 32);
+        ParagonIE_Sodium_Compat::add($a_, $b_);
+        return self::sc_reduce($a_);
+    }
+
+    /**
+     * @param string $x
+     * @param string $y
+     * @return string
+     * @throws SodiumException
+     */
+    public static function scalar_sub($x, $y)
+    {
+        $yn = self::scalar_negate($y);
+        return self::scalar_add($x, $yn);
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core/HChaCha20.php b/vendor/paragonie/sodium_compat/src/Core/HChaCha20.php
new file mode 100644
index 0000000..947df10
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core/HChaCha20.php
@@ -0,0 +1,108 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core_HChaCha20', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core_HChaCha20
+ */
+class ParagonIE_Sodium_Core_HChaCha20 extends ParagonIE_Sodium_Core_ChaCha20
+{
+    /**
+     * @param string $in
+     * @param string $key
+     * @param string|null $c
+     * @return string
+     * @throws TypeError
+     */
+    public static function hChaCha20($in = '', $key = '', $c = null)
+    {
+        $ctx = array();
+
+        if ($c === null) {
+            $ctx[0] = 0x61707865;
+            $ctx[1] = 0x3320646e;
+            $ctx[2] = 0x79622d32;
+            $ctx[3] = 0x6b206574;
+        } else {
+            $ctx[0] = self::load_4(self::substr($c,  0, 4));
+            $ctx[1] = self::load_4(self::substr($c,  4, 4));
+            $ctx[2] = self::load_4(self::substr($c,  8, 4));
+            $ctx[3] = self::load_4(self::substr($c, 12, 4));
+        }
+        $ctx[4]  = self::load_4(self::substr($key,  0, 4));
+        $ctx[5]  = self::load_4(self::substr($key,  4, 4));
+        $ctx[6]  = self::load_4(self::substr($key,  8, 4));
+        $ctx[7]  = self::load_4(self::substr($key, 12, 4));
+        $ctx[8]  = self::load_4(self::substr($key, 16, 4));
+        $ctx[9]  = self::load_4(self::substr($key, 20, 4));
+        $ctx[10] = self::load_4(self::substr($key, 24, 4));
+        $ctx[11] = self::load_4(self::substr($key, 28, 4));
+        $ctx[12] = self::load_4(self::substr($in,   0, 4));
+        $ctx[13] = self::load_4(self::substr($in,   4, 4));
+        $ctx[14] = self::load_4(self::substr($in,   8, 4));
+        $ctx[15] = self::load_4(self::substr($in,  12, 4));
+        return self::hChaCha20Bytes($ctx);
+    }
+
+    /**
+     * @param array $ctx
+     * @return string
+     * @throws TypeError
+     */
+    protected static function hChaCha20Bytes(array $ctx)
+    {
+        $x0  = (int) $ctx[0];
+        $x1  = (int) $ctx[1];
+        $x2  = (int) $ctx[2];
+        $x3  = (int) $ctx[3];
+        $x4  = (int) $ctx[4];
+        $x5  = (int) $ctx[5];
+        $x6  = (int) $ctx[6];
+        $x7  = (int) $ctx[7];
+        $x8  = (int) $ctx[8];
+        $x9  = (int) $ctx[9];
+        $x10 = (int) $ctx[10];
+        $x11 = (int) $ctx[11];
+        $x12 = (int) $ctx[12];
+        $x13 = (int) $ctx[13];
+        $x14 = (int) $ctx[14];
+        $x15 = (int) $ctx[15];
+
+        for ($i = 0; $i < 10; ++$i) {
+            # QUARTERROUND( x0,  x4,  x8,  x12)
+            list($x0, $x4, $x8, $x12) = self::quarterRound($x0, $x4, $x8, $x12);
+
+            # QUARTERROUND( x1,  x5,  x9,  x13)
+            list($x1, $x5, $x9, $x13) = self::quarterRound($x1, $x5, $x9, $x13);
+
+            # QUARTERROUND( x2,  x6,  x10,  x14)
+            list($x2, $x6, $x10, $x14) = self::quarterRound($x2, $x6, $x10, $x14);
+
+            # QUARTERROUND( x3,  x7,  x11,  x15)
+            list($x3, $x7, $x11, $x15) = self::quarterRound($x3, $x7, $x11, $x15);
+
+            # QUARTERROUND( x0,  x5,  x10,  x15)
+            list($x0, $x5, $x10, $x15) = self::quarterRound($x0, $x5, $x10, $x15);
+
+            # QUARTERROUND( x1,  x6,  x11,  x12)
+            list($x1, $x6, $x11, $x12) = self::quarterRound($x1, $x6, $x11, $x12);
+
+            # QUARTERROUND( x2,  x7,  x8,  x13)
+            list($x2, $x7, $x8, $x13) = self::quarterRound($x2, $x7, $x8, $x13);
+
+            # QUARTERROUND( x3,  x4,  x9,  x14)
+            list($x3, $x4, $x9, $x14) = self::quarterRound($x3, $x4, $x9, $x14);
+        }
+
+        return self::store32_le((int) ($x0  & 0xffffffff)) .
+            self::store32_le((int) ($x1  & 0xffffffff)) .
+            self::store32_le((int) ($x2  & 0xffffffff)) .
+            self::store32_le((int) ($x3  & 0xffffffff)) .
+            self::store32_le((int) ($x12 & 0xffffffff)) .
+            self::store32_le((int) ($x13 & 0xffffffff)) .
+            self::store32_le((int) ($x14 & 0xffffffff)) .
+            self::store32_le((int) ($x15 & 0xffffffff));
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core/HSalsa20.php b/vendor/paragonie/sodium_compat/src/Core/HSalsa20.php
new file mode 100644
index 0000000..35ee79e
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core/HSalsa20.php
@@ -0,0 +1,96 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core_HSalsa20', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core_HSalsa20
+ */
+abstract class ParagonIE_Sodium_Core_HSalsa20 extends ParagonIE_Sodium_Core_Salsa20
+{
+    /**
+     * Calculate an hsalsa20 hash of a single block
+     *
+     * HSalsa20 doesn't have a counter and will never be used for more than
+     * one block (used to derive a subkey for xsalsa20).
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $in
+     * @param string $k
+     * @param string|null $c
+     * @return string
+     * @throws TypeError
+     */
+    public static function hsalsa20($in, $k, $c = null)
+    {
+        if ($c === null) {
+            $x0  = 0x61707865;
+            $x5  = 0x3320646e;
+            $x10 = 0x79622d32;
+            $x15 = 0x6b206574;
+        } else {
+            $x0  = self::load_4(self::substr($c, 0, 4));
+            $x5  = self::load_4(self::substr($c, 4, 4));
+            $x10 = self::load_4(self::substr($c, 8, 4));
+            $x15 = self::load_4(self::substr($c, 12, 4));
+        }
+        $x1  = self::load_4(self::substr($k, 0, 4));
+        $x2  = self::load_4(self::substr($k, 4, 4));
+        $x3  = self::load_4(self::substr($k, 8, 4));
+        $x4  = self::load_4(self::substr($k, 12, 4));
+        $x11 = self::load_4(self::substr($k, 16, 4));
+        $x12 = self::load_4(self::substr($k, 20, 4));
+        $x13 = self::load_4(self::substr($k, 24, 4));
+        $x14 = self::load_4(self::substr($k, 28, 4));
+        $x6  = self::load_4(self::substr($in, 0, 4));
+        $x7  = self::load_4(self::substr($in, 4, 4));
+        $x8  = self::load_4(self::substr($in, 8, 4));
+        $x9  = self::load_4(self::substr($in, 12, 4));
+
+        for ($i = self::ROUNDS; $i > 0; $i -= 2) {
+            $x4 ^= self::rotate($x0 + $x12, 7);
+            $x8 ^= self::rotate($x4 + $x0, 9);
+            $x12 ^= self::rotate($x8 + $x4, 13);
+            $x0 ^= self::rotate($x12 + $x8, 18);
+            $x9 ^= self::rotate($x5 + $x1, 7);
+            $x13 ^= self::rotate($x9 + $x5, 9);
+            $x1 ^= self::rotate($x13 + $x9, 13);
+            $x5 ^= self::rotate($x1 + $x13, 18);
+            $x14 ^= self::rotate($x10 + $x6, 7);
+            $x2 ^= self::rotate($x14 + $x10, 9);
+            $x6 ^= self::rotate($x2 + $x14, 13);
+            $x10 ^= self::rotate($x6 + $x2, 18);
+            $x3 ^= self::rotate($x15 + $x11, 7);
+            $x7 ^= self::rotate($x3 + $x15, 9);
+            $x11 ^= self::rotate($x7 + $x3, 13);
+            $x15 ^= self::rotate($x11 + $x7, 18);
+            $x1 ^= self::rotate($x0 + $x3, 7);
+            $x2 ^= self::rotate($x1 + $x0, 9);
+            $x3 ^= self::rotate($x2 + $x1, 13);
+            $x0 ^= self::rotate($x3 + $x2, 18);
+            $x6 ^= self::rotate($x5 + $x4, 7);
+            $x7 ^= self::rotate($x6 + $x5, 9);
+            $x4 ^= self::rotate($x7 + $x6, 13);
+            $x5 ^= self::rotate($x4 + $x7, 18);
+            $x11 ^= self::rotate($x10 + $x9, 7);
+            $x8 ^= self::rotate($x11 + $x10, 9);
+            $x9 ^= self::rotate($x8 + $x11, 13);
+            $x10 ^= self::rotate($x9 + $x8, 18);
+            $x12 ^= self::rotate($x15 + $x14, 7);
+            $x13 ^= self::rotate($x12 + $x15, 9);
+            $x14 ^= self::rotate($x13 + $x12, 13);
+            $x15 ^= self::rotate($x14 + $x13, 18);
+        }
+
+        return self::store32_le($x0) .
+            self::store32_le($x5) .
+            self::store32_le($x10) .
+            self::store32_le($x15) .
+            self::store32_le($x6) .
+            self::store32_le($x7) .
+            self::store32_le($x8) .
+            self::store32_le($x9);
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core/Poly1305.php b/vendor/paragonie/sodium_compat/src/Core/Poly1305.php
new file mode 100644
index 0000000..3301821
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core/Poly1305.php
@@ -0,0 +1,63 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core_Poly1305', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core_Poly1305
+ */
+abstract class ParagonIE_Sodium_Core_Poly1305 extends ParagonIE_Sodium_Core_Util
+{
+    const BLOCK_SIZE = 16;
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $m
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function onetimeauth($m, $key)
+    {
+        if (self::strlen($key) < 32) {
+            throw new InvalidArgumentException(
+                'Key must be 32 bytes long.'
+            );
+        }
+        $state = new ParagonIE_Sodium_Core_Poly1305_State(
+            self::substr($key, 0, 32)
+        );
+        return $state
+            ->update($m)
+            ->finish();
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $mac
+     * @param string $m
+     * @param string $key
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function onetimeauth_verify($mac, $m, $key)
+    {
+        if (self::strlen($key) < 32) {
+            throw new InvalidArgumentException(
+                'Key must be 32 bytes long.'
+            );
+        }
+        $state = new ParagonIE_Sodium_Core_Poly1305_State(
+            self::substr($key, 0, 32)
+        );
+        $calc = $state
+            ->update($m)
+            ->finish();
+        return self::verify_16($calc, $mac);
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core/Poly1305/State.php b/vendor/paragonie/sodium_compat/src/Core/Poly1305/State.php
new file mode 100644
index 0000000..4b64e04
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core/Poly1305/State.php
@@ -0,0 +1,445 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core_Poly1305_State', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core_Poly1305_State
+ */
+class ParagonIE_Sodium_Core_Poly1305_State extends ParagonIE_Sodium_Core_Util
+{
+    /**
+     * @var array<int, int>
+     */
+    protected $buffer = array();
+
+    /**
+     * @var bool
+     */
+    protected $final = false;
+
+    /**
+     * @var array<int, int>
+     */
+    public $h;
+
+    /**
+     * @var int
+     */
+    protected $leftover = 0;
+
+    /**
+     * @var int[]
+     */
+    public $r;
+
+    /**
+     * @var int[]
+     */
+    public $pad;
+
+    /**
+     * ParagonIE_Sodium_Core_Poly1305_State constructor.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $key
+     * @throws InvalidArgumentException
+     * @throws TypeError
+     */
+    public function __construct($key = '')
+    {
+        if (self::strlen($key) < 32) {
+            throw new InvalidArgumentException(
+                'Poly1305 requires a 32-byte key'
+            );
+        }
+        /* r &= 0xffffffc0ffffffc0ffffffc0fffffff */
+        $this->r = array(
+            (int) ((self::load_4(self::substr($key, 0, 4))) & 0x3ffffff),
+            (int) ((self::load_4(self::substr($key, 3, 4)) >> 2) & 0x3ffff03),
+            (int) ((self::load_4(self::substr($key, 6, 4)) >> 4) & 0x3ffc0ff),
+            (int) ((self::load_4(self::substr($key, 9, 4)) >> 6) & 0x3f03fff),
+            (int) ((self::load_4(self::substr($key, 12, 4)) >> 8) & 0x00fffff)
+        );
+
+        /* h = 0 */
+        $this->h = array(0, 0, 0, 0, 0);
+
+        /* save pad for later */
+        $this->pad = array(
+            self::load_4(self::substr($key, 16, 4)),
+            self::load_4(self::substr($key, 20, 4)),
+            self::load_4(self::substr($key, 24, 4)),
+            self::load_4(self::substr($key, 28, 4)),
+        );
+
+        $this->leftover = 0;
+        $this->final = false;
+    }
+
+    /**
+     * Zero internal buffer upon destruction
+     */
+    public function __destruct()
+    {
+        $this->r[0] ^= $this->r[0];
+        $this->r[1] ^= $this->r[1];
+        $this->r[2] ^= $this->r[2];
+        $this->r[3] ^= $this->r[3];
+        $this->r[4] ^= $this->r[4];
+        $this->h[0] ^= $this->h[0];
+        $this->h[1] ^= $this->h[1];
+        $this->h[2] ^= $this->h[2];
+        $this->h[3] ^= $this->h[3];
+        $this->h[4] ^= $this->h[4];
+        $this->pad[0] ^= $this->pad[0];
+        $this->pad[1] ^= $this->pad[1];
+        $this->pad[2] ^= $this->pad[2];
+        $this->pad[3] ^= $this->pad[3];
+        $this->leftover = 0;
+        $this->final = true;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $message
+     * @return self
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public function update($message = '')
+    {
+        $bytes = self::strlen($message);
+        if ($bytes < 1) {
+            return $this;
+        }
+
+        /* handle leftover */
+        if ($this->leftover) {
+            $want = ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE - $this->leftover;
+            if ($want > $bytes) {
+                $want = $bytes;
+            }
+            for ($i = 0; $i < $want; ++$i) {
+                $mi = self::chrToInt($message[$i]);
+                $this->buffer[$this->leftover + $i] = $mi;
+            }
+            // We snip off the leftmost bytes.
+            $message = self::substr($message, $want);
+            $bytes = self::strlen($message);
+            $this->leftover += $want;
+            if ($this->leftover < ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE) {
+                // We still don't have enough to run $this->blocks()
+                return $this;
+            }
+
+            $this->blocks(
+                self::intArrayToString($this->buffer),
+                ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE
+            );
+            $this->leftover = 0;
+        }
+
+        /* process full blocks */
+        if ($bytes >= ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE) {
+            /** @var int $want */
+            $want = $bytes & ~(ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE - 1);
+            if ($want >= ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE) {
+                $block = self::substr($message, 0, $want);
+                if (self::strlen($block) >= ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE) {
+                    $this->blocks($block, $want);
+                    $message = self::substr($message, $want);
+                    $bytes = self::strlen($message);
+                }
+            }
+        }
+
+        /* store leftover */
+        if ($bytes) {
+            for ($i = 0; $i < $bytes; ++$i) {
+                $mi = self::chrToInt($message[$i]);
+                $this->buffer[$this->leftover + $i] = $mi;
+            }
+            $this->leftover = (int) $this->leftover + $bytes;
+        }
+        return $this;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $message
+     * @param int $bytes
+     * @return self
+     * @throws TypeError
+     */
+    public function blocks($message, $bytes)
+    {
+        if (self::strlen($message) < 16) {
+            $message = str_pad($message, 16, "\x00", STR_PAD_RIGHT);
+        }
+        /** @var int $hibit */
+        $hibit = $this->final ? 0 : 1 << 24; /* 1 << 128 */
+        $r0 = (int) $this->r[0];
+        $r1 = (int) $this->r[1];
+        $r2 = (int) $this->r[2];
+        $r3 = (int) $this->r[3];
+        $r4 = (int) $this->r[4];
+
+        $s1 = self::mul($r1, 5, 3);
+        $s2 = self::mul($r2, 5, 3);
+        $s3 = self::mul($r3, 5, 3);
+        $s4 = self::mul($r4, 5, 3);
+
+        $h0 = $this->h[0];
+        $h1 = $this->h[1];
+        $h2 = $this->h[2];
+        $h3 = $this->h[3];
+        $h4 = $this->h[4];
+
+        while ($bytes >= ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE) {
+            /* h += m[i] */
+            $h0 +=  self::load_4(self::substr($message, 0, 4))       & 0x3ffffff;
+            $h1 += (self::load_4(self::substr($message, 3, 4)) >> 2) & 0x3ffffff;
+            $h2 += (self::load_4(self::substr($message, 6, 4)) >> 4) & 0x3ffffff;
+            $h3 += (self::load_4(self::substr($message, 9, 4)) >> 6) & 0x3ffffff;
+            $h4 += (self::load_4(self::substr($message, 12, 4)) >> 8) | $hibit;
+
+            /* h *= r */
+            $d0 = (
+                self::mul($h0, $r0, 25) +
+                self::mul($s4, $h1, 26) +
+                self::mul($s3, $h2, 26) +
+                self::mul($s2, $h3, 26) +
+                self::mul($s1, $h4, 26)
+            );
+
+            $d1 = (
+                self::mul($h0, $r1, 25) +
+                self::mul($h1, $r0, 25) +
+                self::mul($s4, $h2, 26) +
+                self::mul($s3, $h3, 26) +
+                self::mul($s2, $h4, 26)
+            );
+
+            $d2 = (
+                self::mul($h0, $r2, 25) +
+                self::mul($h1, $r1, 25) +
+                self::mul($h2, $r0, 25) +
+                self::mul($s4, $h3, 26) +
+                self::mul($s3, $h4, 26)
+            );
+
+            $d3 = (
+                self::mul($h0, $r3, 25) +
+                self::mul($h1, $r2, 25) +
+                self::mul($h2, $r1, 25) +
+                self::mul($h3, $r0, 25) +
+                self::mul($s4, $h4, 26)
+            );
+
+            $d4 = (
+                self::mul($h0, $r4, 25) +
+                self::mul($h1, $r3, 25) +
+                self::mul($h2, $r2, 25) +
+                self::mul($h3, $r1, 25) +
+                self::mul($h4, $r0, 25)
+            );
+
+            /* (partial) h %= p */
+            /** @var int $c */
+            $c = $d0 >> 26;
+            /** @var int $h0 */
+            $h0 = $d0 & 0x3ffffff;
+            $d1 += $c;
+
+            /** @var int $c */
+            $c = $d1 >> 26;
+            /** @var int $h1 */
+            $h1 = $d1 & 0x3ffffff;
+            $d2 += $c;
+
+            /** @var int $c */
+            $c = $d2 >> 26;
+            /** @var int $h2  */
+            $h2 = $d2 & 0x3ffffff;
+            $d3 += $c;
+
+            /** @var int $c */
+            $c = $d3 >> 26;
+            /** @var int $h3 */
+            $h3 = $d3 & 0x3ffffff;
+            $d4 += $c;
+
+            /** @var int $c */
+            $c = $d4 >> 26;
+            /** @var int $h4 */
+            $h4 = $d4 & 0x3ffffff;
+            $h0 += (int) self::mul($c, 5, 3);
+
+            /** @var int $c */
+            $c = $h0 >> 26;
+            /** @var int $h0 */
+            $h0 &= 0x3ffffff;
+            $h1 += $c;
+
+            // Chop off the left 32 bytes.
+            $message = self::substr(
+                $message,
+                ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE
+            );
+            $bytes -= ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE;
+        }
+
+        $this->h = array(
+            (int) ($h0 & 0xffffffff),
+            (int) ($h1 & 0xffffffff),
+            (int) ($h2 & 0xffffffff),
+            (int) ($h3 & 0xffffffff),
+            (int) ($h4 & 0xffffffff)
+        );
+        return $this;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @return string
+     * @throws TypeError
+     */
+    public function finish()
+    {
+        /* process the remaining block */
+        if ($this->leftover) {
+            $i = $this->leftover;
+            $this->buffer[$i++] = 1;
+            for (; $i < ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE; ++$i) {
+                $this->buffer[$i] = 0;
+            }
+            $this->final = true;
+            $this->blocks(
+                self::substr(
+                    self::intArrayToString($this->buffer),
+                    0,
+                    ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE
+                ),
+                ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE
+            );
+        }
+
+        $h0 = (int) $this->h[0];
+        $h1 = (int) $this->h[1];
+        $h2 = (int) $this->h[2];
+        $h3 = (int) $this->h[3];
+        $h4 = (int) $this->h[4];
+
+        /** @var int $c */
+        $c = $h1 >> 26;
+        /** @var int $h1 */
+        $h1 &= 0x3ffffff;
+        /** @var int $h2 */
+        $h2 += $c;
+        /** @var int $c */
+        $c = $h2 >> 26;
+        /** @var int $h2 */
+        $h2 &= 0x3ffffff;
+        $h3 += $c;
+        /** @var int $c */
+        $c = $h3 >> 26;
+        $h3 &= 0x3ffffff;
+        $h4 += $c;
+        /** @var int $c */
+        $c = $h4 >> 26;
+        $h4 &= 0x3ffffff;
+        /** @var int $h0 */
+        $h0 += self::mul($c, 5, 3);
+        /** @var int $c */
+        $c = $h0 >> 26;
+        /** @var int $h0 */
+        $h0 &= 0x3ffffff;
+        /** @var int $h1 */
+        $h1 += $c;
+
+        /* compute h + -p */
+        /** @var int $g0 */
+        $g0 = $h0 + 5;
+        /** @var int $c */
+        $c = $g0 >> 26;
+        /** @var int $g0 */
+        $g0 &= 0x3ffffff;
+
+        /** @var int $g1 */
+        $g1 = $h1 + $c;
+        /** @var int $c */
+        $c = $g1 >> 26;
+        $g1 &= 0x3ffffff;
+
+        /** @var int $g2 */
+        $g2 = $h2 + $c;
+        /** @var int $c */
+        $c = $g2 >> 26;
+        /** @var int $g2 */
+        $g2 &= 0x3ffffff;
+
+        /** @var int $g3 */
+        $g3 = $h3 + $c;
+        /** @var int $c */
+        $c = $g3 >> 26;
+        /** @var int $g3 */
+        $g3 &= 0x3ffffff;
+
+        /** @var int $g4 */
+        $g4 = ($h4 + $c - (1 << 26)) & 0xffffffff;
+
+        /* select h if h < p, or h + -p if h >= p */
+        /** @var int $mask */
+        $mask = ($g4 >> 31) - 1;
+
+        $g0 &= $mask;
+        $g1 &= $mask;
+        $g2 &= $mask;
+        $g3 &= $mask;
+        $g4 &= $mask;
+
+        /** @var int $mask */
+        $mask = ~$mask & 0xffffffff;
+        /** @var int $h0 */
+        $h0 = ($h0 & $mask) | $g0;
+        /** @var int $h1 */
+        $h1 = ($h1 & $mask) | $g1;
+        /** @var int $h2 */
+        $h2 = ($h2 & $mask) | $g2;
+        /** @var int $h3 */
+        $h3 = ($h3 & $mask) | $g3;
+        /** @var int $h4 */
+        $h4 = ($h4 & $mask) | $g4;
+
+        /* h = h % (2^128) */
+        /** @var int $h0 */
+        $h0 = (($h0) | ($h1 << 26)) & 0xffffffff;
+        /** @var int $h1 */
+        $h1 = (($h1 >>  6) | ($h2 << 20)) & 0xffffffff;
+        /** @var int $h2 */
+        $h2 = (($h2 >> 12) | ($h3 << 14)) & 0xffffffff;
+        /** @var int $h3 */
+        $h3 = (($h3 >> 18) | ($h4 <<  8)) & 0xffffffff;
+
+        /* mac = (h + pad) % (2^128) */
+        $f = (int) ($h0 + $this->pad[0]);
+        $h0 = (int) $f;
+        $f = (int) ($h1 + $this->pad[1] + ($f >> 32));
+        $h1 = (int) $f;
+        $f = (int) ($h2 + $this->pad[2] + ($f >> 32));
+        $h2 = (int) $f;
+        $f = (int) ($h3 + $this->pad[3] + ($f >> 32));
+        $h3 = (int) $f;
+
+        return self::store32_le($h0 & 0xffffffff) .
+            self::store32_le($h1 & 0xffffffff) .
+            self::store32_le($h2 & 0xffffffff) .
+            self::store32_le($h3 & 0xffffffff);
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core/Ristretto255.php b/vendor/paragonie/sodium_compat/src/Core/Ristretto255.php
new file mode 100644
index 0000000..27dbbaa
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core/Ristretto255.php
@@ -0,0 +1,707 @@
+<?php
+
+/**
+ * Class ParagonIE_Sodium_Core_Ristretto255
+ */
+class ParagonIE_Sodium_Core_Ristretto255 extends ParagonIE_Sodium_Core_Ed25519
+{
+    const crypto_core_ristretto255_HASHBYTES = 64;
+    const HASH_SC_L = 48;
+    const CORE_H2C_SHA256 = 1;
+    const CORE_H2C_SHA512 = 2;
+
+    /**
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
+     * @param int $b
+     * @return ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public static function fe_cneg(ParagonIE_Sodium_Core_Curve25519_Fe $f, $b)
+    {
+        $negf = self::fe_neg($f);
+        return self::fe_cmov($f, $negf, $b);
+    }
+
+    /**
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
+     * @return ParagonIE_Sodium_Core_Curve25519_Fe
+     * @throws SodiumException
+     */
+    public static function fe_abs(ParagonIE_Sodium_Core_Curve25519_Fe $f)
+    {
+        return self::fe_cneg($f, self::fe_isnegative($f));
+    }
+
+    /**
+     * Returns 0 if this field element results in all NUL bytes.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
+     * @return int
+     * @throws SodiumException
+     */
+    public static function fe_iszero(ParagonIE_Sodium_Core_Curve25519_Fe $f)
+    {
+        static $zero;
+        if ($zero === null) {
+            $zero = str_repeat("\x00", 32);
+        }
+        /** @var string $zero */
+        $str = self::fe_tobytes($f);
+
+        $d = 0;
+        for ($i = 0; $i < 32; ++$i) {
+            $d |= self::chrToInt($str[$i]);
+        }
+        return (($d - 1) >> 31) & 1;
+    }
+
+
+    /**
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $u
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $v
+     * @return array{x: ParagonIE_Sodium_Core_Curve25519_Fe, nonsquare: int}
+     *
+     * @throws SodiumException
+     */
+    public static function ristretto255_sqrt_ratio_m1(
+        ParagonIE_Sodium_Core_Curve25519_Fe $u,
+        ParagonIE_Sodium_Core_Curve25519_Fe $v
+    ) {
+        $sqrtm1 = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$sqrtm1);
+
+        $v3 = self::fe_mul(
+            self::fe_sq($v),
+            $v
+        ); /* v3 = v^3 */
+        $x = self::fe_mul(
+            self::fe_mul(
+                self::fe_sq($v3),
+                $u
+            ),
+            $v
+        ); /* x = uv^7 */
+
+        $x = self::fe_mul(
+            self::fe_mul(
+                self::fe_pow22523($x), /* x = (uv^7)^((q-5)/8) */
+                $v3
+            ),
+            $u
+        ); /* x = uv^3(uv^7)^((q-5)/8) */
+
+        $vxx = self::fe_mul(
+            self::fe_sq($x),
+            $v
+        ); /* vx^2 */
+
+        $m_root_check = self::fe_sub($vxx, $u); /* vx^2-u */
+        $p_root_check = self::fe_add($vxx, $u); /* vx^2+u */
+        $f_root_check = self::fe_mul($u, $sqrtm1); /* u*sqrt(-1) */
+        $f_root_check = self::fe_add($vxx, $f_root_check); /* vx^2+u*sqrt(-1) */
+
+        $has_m_root = self::fe_iszero($m_root_check);
+        $has_p_root = self::fe_iszero($p_root_check);
+        $has_f_root = self::fe_iszero($f_root_check);
+
+        $x_sqrtm1 = self::fe_mul($x, $sqrtm1); /* x*sqrt(-1) */
+
+        $x = self::fe_abs(
+            self::fe_cmov($x, $x_sqrtm1, $has_p_root | $has_f_root)
+        );
+        return array(
+            'x' => $x,
+            'nonsquare' => $has_m_root | $has_p_root
+        );
+    }
+
+    /**
+     * @param string $s
+     * @return int
+     * @throws SodiumException
+     */
+    public static function ristretto255_point_is_canonical($s)
+    {
+        $c = (self::chrToInt($s[31]) & 0x7f) ^ 0x7f;
+        for ($i = 30; $i > 0; --$i) {
+            $c |= self::chrToInt($s[$i]) ^ 0xff;
+        }
+        $c = ($c - 1) >> 8;
+        $d = (0xed - 1 - self::chrToInt($s[0])) >> 8;
+        $e = self::chrToInt($s[31]) >> 7;
+
+        return 1 - ((($c & $d) | $e | self::chrToInt($s[0])) & 1);
+    }
+
+    /**
+     * @param string $s
+     * @param bool $skipCanonicalCheck
+     * @return array{h: ParagonIE_Sodium_Core_Curve25519_Ge_P3, res: int}
+     * @throws SodiumException
+     */
+    public static function ristretto255_frombytes($s, $skipCanonicalCheck = false)
+    {
+        if (!$skipCanonicalCheck) {
+            if (!self::ristretto255_point_is_canonical($s)) {
+                throw new SodiumException('S is not canonical');
+            }
+        }
+
+        $s_ = self::fe_frombytes($s);
+        $ss = self::fe_sq($s_); /* ss = s^2 */
+
+        $u1 = self::fe_sub(self::fe_1(), $ss); /* u1 = 1-ss */
+        $u1u1 = self::fe_sq($u1); /* u1u1 = u1^2 */
+
+        $u2 = self::fe_add(self::fe_1(), $ss); /* u2 = 1+ss */
+        $u2u2 = self::fe_sq($u2); /* u2u2 = u2^2 */
+
+        $v = self::fe_mul(
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$d),
+            $u1u1
+        ); /* v = d*u1^2 */
+        $v = self::fe_neg($v); /* v = -d*u1^2 */
+        $v = self::fe_sub($v, $u2u2); /* v = -(d*u1^2)-u2^2 */
+        $v_u2u2 = self::fe_mul($v, $u2u2); /* v_u2u2 = v*u2^2 */
+
+        // fe25519_1(one);
+        // notsquare = ristretto255_sqrt_ratio_m1(inv_sqrt, one, v_u2u2);
+        $one = self::fe_1();
+        $result = self::ristretto255_sqrt_ratio_m1($one, $v_u2u2);
+        $inv_sqrt = $result['x'];
+        $notsquare = $result['nonsquare'];
+
+        $h = new ParagonIE_Sodium_Core_Curve25519_Ge_P3();
+
+        $h->X = self::fe_mul($inv_sqrt, $u2);
+        $h->Y = self::fe_mul(self::fe_mul($inv_sqrt, $h->X), $v);
+
+        $h->X = self::fe_mul($h->X, $s_);
+        $h->X = self::fe_abs(
+            self::fe_add($h->X, $h->X)
+        );
+        $h->Y = self::fe_mul($u1, $h->Y);
+        $h->Z = self::fe_1();
+        $h->T = self::fe_mul($h->X, $h->Y);
+
+        $res = - ((1 - $notsquare) | self::fe_isnegative($h->T) | self::fe_iszero($h->Y));
+        return array('h' => $h, 'res' => $res);
+    }
+
+    /**
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $h
+     * @return string
+     * @throws SodiumException
+     */
+    public static function ristretto255_p3_tobytes(ParagonIE_Sodium_Core_Curve25519_Ge_P3 $h)
+    {
+        $sqrtm1 = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$sqrtm1);
+        $invsqrtamd = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$invsqrtamd);
+
+        $u1 = self::fe_add($h->Z, $h->Y); /* u1 = Z+Y */
+        $zmy = self::fe_sub($h->Z, $h->Y); /* zmy = Z-Y */
+        $u1 = self::fe_mul($u1, $zmy); /* u1 = (Z+Y)*(Z-Y) */
+        $u2 = self::fe_mul($h->X, $h->Y); /* u2 = X*Y */
+
+        $u1_u2u2 = self::fe_mul(self::fe_sq($u2), $u1); /* u1_u2u2 = u1*u2^2 */
+        $one = self::fe_1();
+
+        // fe25519_1(one);
+        // (void) ristretto255_sqrt_ratio_m1(inv_sqrt, one, u1_u2u2);
+        $result = self::ristretto255_sqrt_ratio_m1($one, $u1_u2u2);
+        $inv_sqrt = $result['x'];
+
+        $den1 = self::fe_mul($inv_sqrt, $u1); /* den1 = inv_sqrt*u1 */
+        $den2 = self::fe_mul($inv_sqrt, $u2); /* den2 = inv_sqrt*u2 */
+        $z_inv = self::fe_mul($h->T, self::fe_mul($den1, $den2)); /* z_inv = den1*den2*T */
+
+        $ix = self::fe_mul($h->X, $sqrtm1); /* ix = X*sqrt(-1) */
+        $iy = self::fe_mul($h->Y, $sqrtm1); /* iy = Y*sqrt(-1) */
+        $eden = self::fe_mul($den1, $invsqrtamd);
+
+        $t_z_inv =  self::fe_mul($h->T, $z_inv); /* t_z_inv = T*z_inv */
+        $rotate = self::fe_isnegative($t_z_inv);
+
+        $x_ = self::fe_copy($h->X);
+        $y_ = self::fe_copy($h->Y);
+        $den_inv = self::fe_copy($den2);
+
+        $x_ = self::fe_cmov($x_, $iy, $rotate);
+        $y_ = self::fe_cmov($y_, $ix, $rotate);
+        $den_inv = self::fe_cmov($den_inv, $eden, $rotate);
+
+        $x_z_inv = self::fe_mul($x_, $z_inv);
+        $y_ = self::fe_cneg($y_, self::fe_isnegative($x_z_inv));
+
+
+        // fe25519_sub(s_, h->Z, y_);
+        // fe25519_mul(s_, den_inv, s_);
+        // fe25519_abs(s_, s_);
+        // fe25519_tobytes(s, s_);
+        return self::fe_tobytes(
+            self::fe_abs(
+                self::fe_mul(
+                    $den_inv,
+                    self::fe_sub($h->Z, $y_)
+                )
+            )
+        );
+    }
+
+    /**
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $t
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P3
+     *
+     * @throws SodiumException
+     */
+    public static function ristretto255_elligator(ParagonIE_Sodium_Core_Curve25519_Fe $t)
+    {
+        $sqrtm1   = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$sqrtm1);
+        $onemsqd  = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$onemsqd);
+        $d        = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$d);
+        $sqdmone  = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$sqdmone);
+        $sqrtadm1 = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$sqrtadm1);
+
+        $one = self::fe_1();
+        $r   = self::fe_mul($sqrtm1, self::fe_sq($t));         /* r = sqrt(-1)*t^2 */
+        $u   = self::fe_mul(self::fe_add($r, $one), $onemsqd); /* u = (r+1)*(1-d^2) */
+        $c   = self::fe_neg(self::fe_1());                     /* c = -1 */
+        $rpd = self::fe_add($r, $d);                           /* rpd = r+d */
+
+        $v = self::fe_mul(
+            self::fe_sub(
+                $c,
+                self::fe_mul($r, $d)
+            ),
+            $rpd
+        ); /* v = (c-r*d)*(r+d) */
+
+        $result = self::ristretto255_sqrt_ratio_m1($u, $v);
+        $s = $result['x'];
+        $wasnt_square = 1 - $result['nonsquare'];
+
+        $s_prime = self::fe_neg(
+            self::fe_abs(
+                self::fe_mul($s, $t)
+            )
+        ); /* s_prime = -|s*t| */
+        $s = self::fe_cmov($s, $s_prime, $wasnt_square);
+        $c = self::fe_cmov($c, $r, $wasnt_square);
+
+        // fe25519_sub(n, r, one);            /* n = r-1 */
+        // fe25519_mul(n, n, c);              /* n = c*(r-1) */
+        // fe25519_mul(n, n, ed25519_sqdmone); /* n = c*(r-1)*(d-1)^2 */
+        // fe25519_sub(n, n, v);              /* n =  c*(r-1)*(d-1)^2-v */
+        $n = self::fe_sub(
+            self::fe_mul(
+                self::fe_mul(
+                    self::fe_sub($r, $one),
+                    $c
+                ),
+                $sqdmone
+            ),
+            $v
+        ); /* n =  c*(r-1)*(d-1)^2-v */
+
+        $w0 = self::fe_mul(
+            self::fe_add($s, $s),
+            $v
+        ); /* w0 = 2s*v */
+
+        $w1 = self::fe_mul($n, $sqrtadm1); /* w1 = n*sqrt(ad-1) */
+        $ss = self::fe_sq($s); /* ss = s^2 */
+        $w2 = self::fe_sub($one, $ss); /* w2 = 1-s^2 */
+        $w3 = self::fe_add($one, $ss); /* w3 = 1+s^2 */
+
+        return new ParagonIE_Sodium_Core_Curve25519_Ge_P3(
+            self::fe_mul($w0, $w3),
+            self::fe_mul($w2, $w1),
+            self::fe_mul($w1, $w3),
+            self::fe_mul($w0, $w2)
+        );
+    }
+
+    /**
+     * @param string $h
+     * @return string
+     * @throws SodiumException
+     */
+    public static function ristretto255_from_hash($h)
+    {
+        if (self::strlen($h) !== 64) {
+            throw new SodiumException('Hash must be 64 bytes');
+        }
+        //fe25519_frombytes(r0, h);
+        //fe25519_frombytes(r1, h + 32);
+        $r0 = self::fe_frombytes(self::substr($h, 0, 32));
+        $r1 = self::fe_frombytes(self::substr($h, 32, 32));
+
+        //ristretto255_elligator(&p0, r0);
+        //ristretto255_elligator(&p1, r1);
+        $p0 = self::ristretto255_elligator($r0);
+        $p1 = self::ristretto255_elligator($r1);
+
+        //ge25519_p3_to_cached(&p1_cached, &p1);
+        //ge25519_add_cached(&p_p1p1, &p0, &p1_cached);
+        $p_p1p1 = self::ge_add(
+            $p0,
+            self::ge_p3_to_cached($p1)
+        );
+
+        //ge25519_p1p1_to_p3(&p, &p_p1p1);
+        //ristretto255_p3_tobytes(s, &p);
+        return self::ristretto255_p3_tobytes(
+            self::ge_p1p1_to_p3($p_p1p1)
+        );
+    }
+
+    /**
+     * @param string $p
+     * @return int
+     * @throws SodiumException
+     */
+    public static function is_valid_point($p)
+    {
+        $result = self::ristretto255_frombytes($p);
+        if ($result['res'] !== 0) {
+            return 0;
+        }
+        return 1;
+    }
+
+    /**
+     * @param string $p
+     * @param string $q
+     * @return string
+     * @throws SodiumException
+     */
+    public static function ristretto255_add($p, $q)
+    {
+        $p_res = self::ristretto255_frombytes($p);
+        $q_res = self::ristretto255_frombytes($q);
+        if ($p_res['res'] !== 0 || $q_res['res'] !== 0) {
+            throw new SodiumException('Could not add points');
+        }
+        $p_p3 = $p_res['h'];
+        $q_p3 = $q_res['h'];
+        $q_cached = self::ge_p3_to_cached($q_p3);
+        $r_p1p1 = self::ge_add($p_p3, $q_cached);
+        $r_p3 = self::ge_p1p1_to_p3($r_p1p1);
+        return self::ristretto255_p3_tobytes($r_p3);
+    }
+
+    /**
+     * @param string $p
+     * @param string $q
+     * @return string
+     * @throws SodiumException
+     */
+    public static function ristretto255_sub($p, $q)
+    {
+        $p_res = self::ristretto255_frombytes($p);
+        $q_res = self::ristretto255_frombytes($q);
+        if ($p_res['res'] !== 0 || $q_res['res'] !== 0) {
+            throw new SodiumException('Could not add points');
+        }
+        $p_p3 = $p_res['h'];
+        $q_p3 = $q_res['h'];
+        $q_cached = self::ge_p3_to_cached($q_p3);
+        $r_p1p1 = self::ge_sub($p_p3, $q_cached);
+        $r_p3 = self::ge_p1p1_to_p3($r_p1p1);
+        return self::ristretto255_p3_tobytes($r_p3);
+    }
+
+
+    /**
+     * @param int $hLen
+     * @param ?string $ctx
+     * @param string $msg
+     * @return string
+     * @throws SodiumException
+     * @psalm-suppress PossiblyInvalidArgument hash API
+     */
+    protected static function h2c_string_to_hash_sha256($hLen, $ctx, $msg)
+    {
+        $h = array_fill(0, $hLen, 0);
+        $ctx_len = !is_null($ctx) ? self::strlen($ctx) : 0;
+        if ($hLen > 0xff) {
+            throw new SodiumException('Hash must be less than 256 bytes');
+        }
+
+        if ($ctx_len > 0xff) {
+            $st = hash_init('sha256');
+            self::hash_update($st, "H2C-OVERSIZE-DST-");
+            self::hash_update($st, $ctx);
+            $ctx = hash_final($st, true);
+            $ctx_len = 32;
+        }
+        $t = array(0, $hLen, 0);
+        $ux = str_repeat("\0", 64);
+        $st = hash_init('sha256');
+        self::hash_update($st, $ux);
+        self::hash_update($st, $msg);
+        self::hash_update($st, self::intArrayToString($t));
+        self::hash_update($st, $ctx);
+        self::hash_update($st, self::intToChr($ctx_len));
+        $u0 = hash_final($st, true);
+
+        for ($i = 0; $i < $hLen; $i += 64) {
+            $ux = self::xorStrings($ux, $u0);
+            ++$t[2];
+            $st = hash_init('sha256');
+            self::hash_update($st, $ux);
+            self::hash_update($st, self::intToChr($t[2]));
+            self::hash_update($st, $ctx);
+            self::hash_update($st, self::intToChr($ctx_len));
+            $ux = hash_final($st, true);
+            $amount = min($hLen - $i, 64);
+            for ($j = 0; $j < $amount; ++$j) {
+                $h[$i + $j] = self::chrToInt($ux[$i]);
+            }
+        }
+        return self::intArrayToString(array_slice($h, 0, $hLen));
+    }
+
+    /**
+     * @param int $hLen
+     * @param ?string $ctx
+     * @param string $msg
+     * @return string
+     * @throws SodiumException
+     * @psalm-suppress PossiblyInvalidArgument hash API
+     */
+    protected static function h2c_string_to_hash_sha512($hLen, $ctx, $msg)
+    {
+        $h = array_fill(0, $hLen, 0);
+        $ctx_len = !is_null($ctx) ? self::strlen($ctx) : 0;
+        if ($hLen > 0xff) {
+            throw new SodiumException('Hash must be less than 256 bytes');
+        }
+
+        if ($ctx_len > 0xff) {
+            $st = hash_init('sha256');
+            self::hash_update($st, "H2C-OVERSIZE-DST-");
+            self::hash_update($st, $ctx);
+            $ctx = hash_final($st, true);
+            $ctx_len = 32;
+        }
+        $t = array(0, $hLen, 0);
+        $ux = str_repeat("\0", 128);
+        $st = hash_init('sha512');
+        self::hash_update($st, $ux);
+        self::hash_update($st, $msg);
+        self::hash_update($st, self::intArrayToString($t));
+        self::hash_update($st, $ctx);
+        self::hash_update($st, self::intToChr($ctx_len));
+        $u0 = hash_final($st, true);
+
+        for ($i = 0; $i < $hLen; $i += 128) {
+            $ux = self::xorStrings($ux, $u0);
+            ++$t[2];
+            $st = hash_init('sha512');
+            self::hash_update($st, $ux);
+            self::hash_update($st, self::intToChr($t[2]));
+            self::hash_update($st, $ctx);
+            self::hash_update($st, self::intToChr($ctx_len));
+            $ux = hash_final($st, true);
+            $amount = min($hLen - $i, 128);
+            for ($j = 0; $j < $amount; ++$j) {
+                $h[$i + $j] = self::chrToInt($ux[$i]);
+            }
+        }
+        return self::intArrayToString(array_slice($h, 0, $hLen));
+    }
+
+    /**
+     * @param int $hLen
+     * @param ?string $ctx
+     * @param string $msg
+     * @param int $hash_alg
+     * @return string
+     * @throws SodiumException
+     */
+    public static function h2c_string_to_hash($hLen, $ctx, $msg, $hash_alg)
+    {
+        switch ($hash_alg) {
+            case self::CORE_H2C_SHA256:
+                return self::h2c_string_to_hash_sha256($hLen, $ctx, $msg);
+            case self::CORE_H2C_SHA512:
+                return self::h2c_string_to_hash_sha512($hLen, $ctx, $msg);
+            default:
+                throw new SodiumException('Invalid H2C hash algorithm');
+        }
+    }
+
+    /**
+     * @param ?string $ctx
+     * @param string $msg
+     * @param int $hash_alg
+     * @return string
+     * @throws SodiumException
+     */
+    protected static function _string_to_element($ctx, $msg, $hash_alg)
+    {
+        return self::ristretto255_from_hash(
+            self::h2c_string_to_hash(self::crypto_core_ristretto255_HASHBYTES, $ctx, $msg, $hash_alg)
+        );
+    }
+
+    /**
+     * @return string
+     * @throws SodiumException
+     * @throws Exception
+     */
+    public static function ristretto255_random()
+    {
+        return self::ristretto255_from_hash(
+            ParagonIE_Sodium_Compat::randombytes_buf(self::crypto_core_ristretto255_HASHBYTES)
+        );
+    }
+
+    /**
+     * @return string
+     * @throws SodiumException
+     */
+    public static function ristretto255_scalar_random()
+    {
+        return self::scalar_random();
+    }
+
+    /**
+     * @param string $s
+     * @return string
+     * @throws SodiumException
+     */
+    public static function ristretto255_scalar_complement($s)
+    {
+        return self::scalar_complement($s);
+    }
+
+
+    /**
+     * @param string $s
+     * @return string
+     */
+    public static function ristretto255_scalar_invert($s)
+    {
+        return self::sc25519_invert($s);
+    }
+
+    /**
+     * @param string $s
+     * @return string
+     * @throws SodiumException
+     */
+    public static function ristretto255_scalar_negate($s)
+    {
+        return self::scalar_negate($s);
+    }
+
+    /**
+     * @param string $x
+     * @param string $y
+     * @return string
+     */
+    public static function ristretto255_scalar_add($x, $y)
+    {
+        return self::scalar_add($x, $y);
+    }
+
+    /**
+     * @param string $x
+     * @param string $y
+     * @return string
+     */
+    public static function ristretto255_scalar_sub($x, $y)
+    {
+        return self::scalar_sub($x, $y);
+    }
+
+    /**
+     * @param string $x
+     * @param string $y
+     * @return string
+     */
+    public static function ristretto255_scalar_mul($x, $y)
+    {
+        return self::sc25519_mul($x, $y);
+    }
+
+    /**
+     * @param string $ctx
+     * @param string $msg
+     * @param int $hash_alg
+     * @return string
+     * @throws SodiumException
+     */
+    public static function ristretto255_scalar_from_string($ctx, $msg, $hash_alg)
+    {
+        $h = array_fill(0, 64, 0);
+        $h_be = self::stringToIntArray(
+            self::h2c_string_to_hash(
+                self::HASH_SC_L, $ctx, $msg, $hash_alg
+            )
+        );
+
+        for ($i = 0; $i < self::HASH_SC_L; ++$i) {
+            $h[$i] = $h_be[self::HASH_SC_L - 1 - $i];
+        }
+        return self::ristretto255_scalar_reduce(self::intArrayToString($h));
+    }
+
+    /**
+     * @param string $s
+     * @return string
+     */
+    public static function ristretto255_scalar_reduce($s)
+    {
+        return self::sc_reduce($s);
+    }
+
+    /**
+     * @param string $n
+     * @param string $p
+     * @return string
+     * @throws SodiumException
+     */
+    public static function scalarmult_ristretto255($n, $p)
+    {
+        if (self::strlen($n) !== 32) {
+            throw new SodiumException('Scalar must be 32 bytes, ' . self::strlen($p) . ' given.');
+        }
+        if (self::strlen($p) !== 32) {
+            throw new SodiumException('Point must be 32 bytes, ' . self::strlen($p) . ' given.');
+        }
+        $result = self::ristretto255_frombytes($p);
+        if ($result['res'] !== 0) {
+            throw new SodiumException('Could not multiply points');
+        }
+        $P = $result['h'];
+
+        $t = self::stringToIntArray($n);
+        $t[31] &= 0x7f;
+        $Q = self::ge_scalarmult(self::intArrayToString($t), $P);
+        $q = self::ristretto255_p3_tobytes($Q);
+        if (ParagonIE_Sodium_Compat::is_zero($q)) {
+            throw new SodiumException('An unknown error has occurred');
+        }
+        return $q;
+    }
+
+    /**
+     * @param string $n
+     * @return string
+     * @throws SodiumException
+     */
+    public static function scalarmult_ristretto255_base($n)
+    {
+        $t = self::stringToIntArray($n);
+        $t[31] &= 0x7f;
+        $Q = self::ge_scalarmult_base(self::intArrayToString($t));
+        $q = self::ristretto255_p3_tobytes($Q);
+        if (ParagonIE_Sodium_Compat::is_zero($q)) {
+            throw new SodiumException('An unknown error has occurred');
+        }
+        return $q;
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core/Salsa20.php b/vendor/paragonie/sodium_compat/src/Core/Salsa20.php
new file mode 100644
index 0000000..515ccad
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core/Salsa20.php
@@ -0,0 +1,273 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core_Salsa20', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core_Salsa20
+ */
+abstract class ParagonIE_Sodium_Core_Salsa20 extends ParagonIE_Sodium_Core_Util
+{
+    const ROUNDS = 20;
+
+    /**
+     * Calculate an salsa20 hash of a single block
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $in
+     * @param string $k
+     * @param string|null $c
+     * @return string
+     * @throws TypeError
+     */
+    public static function core_salsa20($in, $k, $c = null)
+    {
+        if (self::strlen($k) < 32) {
+            throw new RangeException('Key must be 32 bytes long');
+        }
+        if ($c === null) {
+            $j0  = $x0  = 0x61707865;
+            $j5  = $x5  = 0x3320646e;
+            $j10 = $x10 = 0x79622d32;
+            $j15 = $x15 = 0x6b206574;
+        } else {
+            $j0  = $x0  = self::load_4(self::substr($c, 0, 4));
+            $j5  = $x5  = self::load_4(self::substr($c, 4, 4));
+            $j10 = $x10 = self::load_4(self::substr($c, 8, 4));
+            $j15 = $x15 = self::load_4(self::substr($c, 12, 4));
+        }
+        $j1  = $x1  = self::load_4(self::substr($k, 0, 4));
+        $j2  = $x2  = self::load_4(self::substr($k, 4, 4));
+        $j3  = $x3  = self::load_4(self::substr($k, 8, 4));
+        $j4  = $x4  = self::load_4(self::substr($k, 12, 4));
+        $j6  = $x6  = self::load_4(self::substr($in, 0, 4));
+        $j7  = $x7  = self::load_4(self::substr($in, 4, 4));
+        $j8  = $x8  = self::load_4(self::substr($in, 8, 4));
+        $j9  = $x9  = self::load_4(self::substr($in, 12, 4));
+        $j11 = $x11 = self::load_4(self::substr($k, 16, 4));
+        $j12 = $x12 = self::load_4(self::substr($k, 20, 4));
+        $j13 = $x13 = self::load_4(self::substr($k, 24, 4));
+        $j14 = $x14 = self::load_4(self::substr($k, 28, 4));
+
+        for ($i = self::ROUNDS; $i > 0; $i -= 2) {
+            $x4 ^= self::rotate($x0 + $x12, 7);
+            $x8 ^= self::rotate($x4 + $x0, 9);
+            $x12 ^= self::rotate($x8 + $x4, 13);
+            $x0 ^= self::rotate($x12 + $x8, 18);
+
+            $x9 ^= self::rotate($x5 + $x1, 7);
+            $x13 ^= self::rotate($x9 + $x5, 9);
+            $x1 ^= self::rotate($x13 + $x9, 13);
+            $x5 ^= self::rotate($x1 + $x13, 18);
+
+            $x14 ^= self::rotate($x10 + $x6, 7);
+            $x2 ^= self::rotate($x14 + $x10, 9);
+            $x6 ^= self::rotate($x2 + $x14, 13);
+            $x10 ^= self::rotate($x6 + $x2, 18);
+
+            $x3 ^= self::rotate($x15 + $x11, 7);
+            $x7 ^= self::rotate($x3 + $x15, 9);
+            $x11 ^= self::rotate($x7 + $x3, 13);
+            $x15 ^= self::rotate($x11 + $x7, 18);
+
+            $x1 ^= self::rotate($x0 + $x3, 7);
+            $x2 ^= self::rotate($x1 + $x0, 9);
+            $x3 ^= self::rotate($x2 + $x1, 13);
+            $x0 ^= self::rotate($x3 + $x2, 18);
+
+            $x6 ^= self::rotate($x5 + $x4, 7);
+            $x7 ^= self::rotate($x6 + $x5, 9);
+            $x4 ^= self::rotate($x7 + $x6, 13);
+            $x5 ^= self::rotate($x4 + $x7, 18);
+
+            $x11 ^= self::rotate($x10 + $x9, 7);
+            $x8 ^= self::rotate($x11 + $x10, 9);
+            $x9 ^= self::rotate($x8 + $x11, 13);
+            $x10 ^= self::rotate($x9 + $x8, 18);
+
+            $x12 ^= self::rotate($x15 + $x14, 7);
+            $x13 ^= self::rotate($x12 + $x15, 9);
+            $x14 ^= self::rotate($x13 + $x12, 13);
+            $x15 ^= self::rotate($x14 + $x13, 18);
+        }
+
+        $x0  += $j0;
+        $x1  += $j1;
+        $x2  += $j2;
+        $x3  += $j3;
+        $x4  += $j4;
+        $x5  += $j5;
+        $x6  += $j6;
+        $x7  += $j7;
+        $x8  += $j8;
+        $x9  += $j9;
+        $x10 += $j10;
+        $x11 += $j11;
+        $x12 += $j12;
+        $x13 += $j13;
+        $x14 += $j14;
+        $x15 += $j15;
+
+        return self::store32_le($x0) .
+            self::store32_le($x1) .
+            self::store32_le($x2) .
+            self::store32_le($x3) .
+            self::store32_le($x4) .
+            self::store32_le($x5) .
+            self::store32_le($x6) .
+            self::store32_le($x7) .
+            self::store32_le($x8) .
+            self::store32_le($x9) .
+            self::store32_le($x10) .
+            self::store32_le($x11) .
+            self::store32_le($x12) .
+            self::store32_le($x13) .
+            self::store32_le($x14) .
+            self::store32_le($x15);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param int $len
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function salsa20($len, $nonce, $key)
+    {
+        if (self::strlen($key) !== 32) {
+            throw new RangeException('Key must be 32 bytes long');
+        }
+        $kcopy = '' . $key;
+        $in = self::substr($nonce, 0, 8) . str_repeat("\0", 8);
+        $c = '';
+        while ($len >= 64) {
+            $c .= self::core_salsa20($in, $kcopy, null);
+            $u = 1;
+            // Internal counter.
+            for ($i = 8; $i < 16; ++$i) {
+                $u += self::chrToInt($in[$i]);
+                $in[$i] = self::intToChr($u & 0xff);
+                $u >>= 8;
+            }
+            $len -= 64;
+        }
+        if ($len > 0) {
+            $c .= self::substr(
+                self::core_salsa20($in, $kcopy, null),
+                0,
+                $len
+            );
+        }
+        try {
+            ParagonIE_Sodium_Compat::memzero($kcopy);
+        } catch (SodiumException $ex) {
+            $kcopy = null;
+        }
+        return $c;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $m
+     * @param string $n
+     * @param int $ic
+     * @param string $k
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function salsa20_xor_ic($m, $n, $ic, $k)
+    {
+        $mlen = self::strlen($m);
+        if ($mlen < 1) {
+            return '';
+        }
+        $kcopy = self::substr($k, 0, 32);
+        $in = self::substr($n, 0, 8);
+        // Initialize the counter
+        $in .= ParagonIE_Sodium_Core_Util::store64_le($ic);
+
+        $c = '';
+        while ($mlen >= 64) {
+            $block = self::core_salsa20($in, $kcopy, null);
+            $c .= self::xorStrings(
+                self::substr($m, 0, 64),
+                self::substr($block, 0, 64)
+            );
+            $u = 1;
+            for ($i = 8; $i < 16; ++$i) {
+                $u += self::chrToInt($in[$i]);
+                $in[$i] = self::intToChr($u & 0xff);
+                $u >>= 8;
+            }
+
+            $mlen -= 64;
+            $m = self::substr($m, 64);
+        }
+
+        if ($mlen) {
+            $block = self::core_salsa20($in, $kcopy, null);
+            $c .= self::xorStrings(
+                self::substr($m, 0, $mlen),
+                self::substr($block, 0, $mlen)
+            );
+        }
+        try {
+            ParagonIE_Sodium_Compat::memzero($block);
+            ParagonIE_Sodium_Compat::memzero($kcopy);
+        } catch (SodiumException $ex) {
+            $block = null;
+            $kcopy = null;
+        }
+
+        return $c;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $message
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function salsa20_xor($message, $nonce, $key)
+    {
+        return self::xorStrings(
+            $message,
+            self::salsa20(
+                self::strlen($message),
+                $nonce,
+                $key
+            )
+        );
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param int $u
+     * @param int $c
+     * @return int
+     */
+    public static function rotate($u, $c)
+    {
+        $u &= 0xffffffff;
+        $c %= 32;
+        return (int) (0xffffffff & (
+                ($u << $c)
+                    |
+                ($u >> (32 - $c))
+            )
+        );
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core/SecretStream/State.php b/vendor/paragonie/sodium_compat/src/Core/SecretStream/State.php
new file mode 100644
index 0000000..2412f65
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core/SecretStream/State.php
@@ -0,0 +1,163 @@
+<?php
+
+/**
+ * Class ParagonIE_Sodium_Core_SecretStream_State
+ */
+class ParagonIE_Sodium_Core_SecretStream_State
+{
+    /** @var string $key */
+    protected $key;
+
+    /** @var int $counter */
+    protected $counter;
+
+    /** @var string $nonce */
+    protected $nonce;
+
+    /** @var string $_pad */
+    protected $_pad;
+
+    /**
+     * ParagonIE_Sodium_Core_SecretStream_State constructor.
+     * @param string $key
+     * @param string|null $nonce
+     */
+    public function __construct($key, $nonce = null)
+    {
+        $this->key = $key;
+        $this->counter = 1;
+        if (is_null($nonce)) {
+            $nonce = str_repeat("\0", 12);
+        }
+        $this->nonce = str_pad($nonce, 12, "\0", STR_PAD_RIGHT);;
+        $this->_pad = str_repeat("\0", 4);
+    }
+
+    /**
+     * @return self
+     */
+    public function counterReset()
+    {
+        $this->counter = 1;
+        $this->_pad = str_repeat("\0", 4);
+        return $this;
+    }
+
+    /**
+     * @return string
+     */
+    public function getKey()
+    {
+        return $this->key;
+    }
+
+    /**
+     * @return string
+     */
+    public function getCounter()
+    {
+        return ParagonIE_Sodium_Core_Util::store32_le($this->counter);
+    }
+
+    /**
+     * @return string
+     */
+    public function getNonce()
+    {
+        if (!is_string($this->nonce)) {
+            $this->nonce = str_repeat("\0", 12);
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($this->nonce) !== 12) {
+            $this->nonce = str_pad($this->nonce, 12, "\0", STR_PAD_RIGHT);
+        }
+        return $this->nonce;
+    }
+
+    /**
+     * @return string
+     */
+    public function getCombinedNonce()
+    {
+        return $this->getCounter() .
+            ParagonIE_Sodium_Core_Util::substr($this->getNonce(), 0, 8);
+    }
+
+    /**
+     * @return self
+     */
+    public function incrementCounter()
+    {
+        ++$this->counter;
+        return $this;
+    }
+
+    /**
+     * @return bool
+     */
+    public function needsRekey()
+    {
+        return ($this->counter & 0xffff) === 0;
+    }
+
+    /**
+     * @param string $newKeyAndNonce
+     * @return self
+     */
+    public function rekey($newKeyAndNonce)
+    {
+        $this->key = ParagonIE_Sodium_Core_Util::substr($newKeyAndNonce, 0, 32);
+        $this->nonce = str_pad(
+            ParagonIE_Sodium_Core_Util::substr($newKeyAndNonce, 32),
+            12,
+            "\0",
+            STR_PAD_RIGHT
+        );
+        return $this;
+    }
+
+    /**
+     * @param string $str
+     * @return self
+     */
+    public function xorNonce($str)
+    {
+        $this->nonce = ParagonIE_Sodium_Core_Util::xorStrings(
+            $this->getNonce(),
+            str_pad(
+                ParagonIE_Sodium_Core_Util::substr($str, 0, 8),
+                12,
+                "\0",
+                STR_PAD_RIGHT
+            )
+        );
+        return $this;
+    }
+
+    /**
+     * @param string $string
+     * @return self
+     */
+    public static function fromString($string)
+    {
+        $state = new ParagonIE_Sodium_Core_SecretStream_State(
+            ParagonIE_Sodium_Core_Util::substr($string, 0, 32)
+        );
+        $state->counter = ParagonIE_Sodium_Core_Util::load_4(
+            ParagonIE_Sodium_Core_Util::substr($string, 32, 4)
+        );
+        $state->nonce = ParagonIE_Sodium_Core_Util::substr($string, 36, 12);
+        $state->_pad = ParagonIE_Sodium_Core_Util::substr($string, 48, 8);
+        return $state;
+    }
+
+    /**
+     * @return string
+     */
+    public function toString()
+    {
+        return $this->key .
+            $this->getCounter() .
+            $this->nonce .
+            $this->_pad;
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core/SipHash.php b/vendor/paragonie/sodium_compat/src/Core/SipHash.php
new file mode 100644
index 0000000..7667527
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core/SipHash.php
@@ -0,0 +1,306 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core_SipHash', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_SodiumCompat_Core_SipHash
+ *
+ * Only uses 32-bit arithmetic, while the original SipHash used 64-bit integers
+ */
+class ParagonIE_Sodium_Core_SipHash extends ParagonIE_Sodium_Core_Util
+{
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param int[] $v
+     * @return int[]
+     *
+     */
+    public static function sipRound(array $v)
+    {
+        # v0 += v1;
+        list($v[0], $v[1]) = self::add(
+            array($v[0], $v[1]),
+            array($v[2], $v[3])
+        );
+
+        #  v1=ROTL(v1,13);
+        list($v[2], $v[3]) = self::rotl_64((int) $v[2], (int) $v[3], 13);
+
+        #  v1 ^= v0;
+        $v[2] = (int) $v[2] ^ (int) $v[0];
+        $v[3] = (int) $v[3] ^ (int) $v[1];
+
+        #  v0=ROTL(v0,32);
+        list($v[0], $v[1]) = self::rotl_64((int) $v[0], (int) $v[1], 32);
+
+        # v2 += v3;
+        list($v[4], $v[5]) = self::add(
+            array((int) $v[4], (int) $v[5]),
+            array((int) $v[6], (int) $v[7])
+        );
+
+        # v3=ROTL(v3,16);
+        list($v[6], $v[7]) = self::rotl_64((int) $v[6], (int) $v[7], 16);
+
+        #  v3 ^= v2;
+        $v[6] = (int) $v[6] ^ (int) $v[4];
+        $v[7] = (int) $v[7] ^ (int) $v[5];
+
+        # v0 += v3;
+        list($v[0], $v[1]) = self::add(
+            array((int) $v[0], (int) $v[1]),
+            array((int) $v[6], (int) $v[7])
+        );
+
+        # v3=ROTL(v3,21);
+        list($v[6], $v[7]) = self::rotl_64((int) $v[6], (int) $v[7], 21);
+
+        # v3 ^= v0;
+        $v[6] = (int) $v[6] ^ (int) $v[0];
+        $v[7] = (int) $v[7] ^ (int) $v[1];
+
+        # v2 += v1;
+        list($v[4], $v[5]) = self::add(
+            array((int) $v[4], (int) $v[5]),
+            array((int) $v[2], (int) $v[3])
+        );
+
+        # v1=ROTL(v1,17);
+        list($v[2], $v[3]) = self::rotl_64((int) $v[2], (int) $v[3], 17);
+
+        #  v1 ^= v2;;
+        $v[2] = (int) $v[2] ^ (int) $v[4];
+        $v[3] = (int) $v[3] ^ (int) $v[5];
+
+        # v2=ROTL(v2,32)
+        list($v[4], $v[5]) = self::rotl_64((int) $v[4], (int) $v[5], 32);
+
+        return $v;
+    }
+
+    /**
+     * Add two 32 bit integers representing a 64-bit integer.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param int[] $a
+     * @param int[] $b
+     * @return array<int, mixed>
+     */
+    public static function add(array $a, array $b)
+    {
+        /** @var int $x1 */
+        $x1 = $a[1] + $b[1];
+        /** @var int $c */
+        $c = $x1 >> 32; // Carry if ($a + $b) > 0xffffffff
+        /** @var int $x0 */
+        $x0 = $a[0] + $b[0] + $c;
+        return array(
+            $x0 & 0xffffffff,
+            $x1 & 0xffffffff
+        );
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param int $int0
+     * @param int $int1
+     * @param int $c
+     * @return array<int, mixed>
+     */
+    public static function rotl_64($int0, $int1, $c)
+    {
+        $int0 &= 0xffffffff;
+        $int1 &= 0xffffffff;
+        $c &= 63;
+        if ($c === 32) {
+            return array($int1, $int0);
+        }
+        if ($c > 31) {
+            $tmp = $int1;
+            $int1 = $int0;
+            $int0 = $tmp;
+            $c &= 31;
+        }
+        if ($c === 0) {
+            return array($int0, $int1);
+        }
+        return array(
+            0xffffffff & (
+                ($int0 << $c)
+                    |
+                ($int1 >> (32 - $c))
+            ),
+            0xffffffff & (
+                ($int1 << $c)
+                    |
+                ($int0 >> (32 - $c))
+            ),
+        );
+    }
+
+    /**
+     * Implements Siphash-2-4 using only 32-bit numbers.
+     *
+     * When we split an int into two, the higher bits go to the lower index.
+     * e.g. 0xDEADBEEFAB10C92D becomes [
+     *     0 => 0xDEADBEEF,
+     *     1 => 0xAB10C92D
+     * ].
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $in
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function sipHash24($in, $key)
+    {
+        $inlen = self::strlen($in);
+
+        # /* "somepseudorandomlygeneratedbytes" */
+        # u64 v0 = 0x736f6d6570736575ULL;
+        # u64 v1 = 0x646f72616e646f6dULL;
+        # u64 v2 = 0x6c7967656e657261ULL;
+        # u64 v3 = 0x7465646279746573ULL;
+        $v = array(
+            0x736f6d65, // 0
+            0x70736575, // 1
+            0x646f7261, // 2
+            0x6e646f6d, // 3
+            0x6c796765, // 4
+            0x6e657261, // 5
+            0x74656462, // 6
+            0x79746573  // 7
+        );
+        // v0 => $v[0], $v[1]
+        // v1 => $v[2], $v[3]
+        // v2 => $v[4], $v[5]
+        // v3 => $v[6], $v[7]
+
+        # u64 k0 = LOAD64_LE( k );
+        # u64 k1 = LOAD64_LE( k + 8 );
+        $k = array(
+            self::load_4(self::substr($key, 4, 4)),
+            self::load_4(self::substr($key, 0, 4)),
+            self::load_4(self::substr($key, 12, 4)),
+            self::load_4(self::substr($key, 8, 4))
+        );
+        // k0 => $k[0], $k[1]
+        // k1 => $k[2], $k[3]
+
+        # b = ( ( u64 )inlen ) << 56;
+        $b = array(
+            $inlen << 24,
+            0
+        );
+        // See docblock for why the 0th index gets the higher bits.
+
+        # v3 ^= k1;
+        $v[6] ^= $k[2];
+        $v[7] ^= $k[3];
+        # v2 ^= k0;
+        $v[4] ^= $k[0];
+        $v[5] ^= $k[1];
+        # v1 ^= k1;
+        $v[2] ^= $k[2];
+        $v[3] ^= $k[3];
+        # v0 ^= k0;
+        $v[0] ^= $k[0];
+        $v[1] ^= $k[1];
+
+        $left = $inlen;
+        # for ( ; in != end; in += 8 )
+        while ($left >= 8) {
+            # m = LOAD64_LE( in );
+            $m = array(
+                self::load_4(self::substr($in, 4, 4)),
+                self::load_4(self::substr($in, 0, 4))
+            );
+
+            # v3 ^= m;
+            $v[6] ^= $m[0];
+            $v[7] ^= $m[1];
+
+            # SIPROUND;
+            # SIPROUND;
+            $v = self::sipRound($v);
+            $v = self::sipRound($v);
+
+            # v0 ^= m;
+            $v[0] ^= $m[0];
+            $v[1] ^= $m[1];
+
+            $in = self::substr($in, 8);
+            $left -= 8;
+        }
+
+        # switch( left )
+        #  {
+        #     case 7: b |= ( ( u64 )in[ 6] )  << 48;
+        #     case 6: b |= ( ( u64 )in[ 5] )  << 40;
+        #     case 5: b |= ( ( u64 )in[ 4] )  << 32;
+        #     case 4: b |= ( ( u64 )in[ 3] )  << 24;
+        #     case 3: b |= ( ( u64 )in[ 2] )  << 16;
+        #     case 2: b |= ( ( u64 )in[ 1] )  <<  8;
+        #     case 1: b |= ( ( u64 )in[ 0] ); break;
+        #     case 0: break;
+        # }
+        switch ($left) {
+            case 7:
+                $b[0] |= self::chrToInt($in[6]) << 16;
+            case 6:
+                $b[0] |= self::chrToInt($in[5]) << 8;
+            case 5:
+                $b[0] |= self::chrToInt($in[4]);
+            case 4:
+                $b[1] |= self::chrToInt($in[3]) << 24;
+            case 3:
+                $b[1] |= self::chrToInt($in[2]) << 16;
+            case 2:
+                $b[1] |= self::chrToInt($in[1]) << 8;
+            case 1:
+                $b[1] |= self::chrToInt($in[0]);
+            case 0:
+                break;
+        }
+        // See docblock for why the 0th index gets the higher bits.
+
+        # v3 ^= b;
+        $v[6] ^= $b[0];
+        $v[7] ^= $b[1];
+
+        # SIPROUND;
+        # SIPROUND;
+        $v = self::sipRound($v);
+        $v = self::sipRound($v);
+
+        # v0 ^= b;
+        $v[0] ^= $b[0];
+        $v[1] ^= $b[1];
+
+        // Flip the lower 8 bits of v2 which is ($v[4], $v[5]) in our implementation
+        # v2 ^= 0xff;
+        $v[5] ^= 0xff;
+
+        # SIPROUND;
+        # SIPROUND;
+        # SIPROUND;
+        # SIPROUND;
+        $v = self::sipRound($v);
+        $v = self::sipRound($v);
+        $v = self::sipRound($v);
+        $v = self::sipRound($v);
+
+        # b = v0 ^ v1 ^ v2 ^ v3;
+        # STORE64_LE( out, b );
+        return  self::store32_le($v[1] ^ $v[3] ^ $v[5] ^ $v[7]) .
+            self::store32_le($v[0] ^ $v[2] ^ $v[4] ^ $v[6]);
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core/Util.php b/vendor/paragonie/sodium_compat/src/Core/Util.php
new file mode 100644
index 0000000..865f544
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core/Util.php
@@ -0,0 +1,942 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core_Util', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core_Util
+ */
+abstract class ParagonIE_Sodium_Core_Util
+{
+    /**
+     * @param int $integer
+     * @param int $size (16, 32, 64)
+     * @return int
+     */
+    public static function abs($integer, $size = 0)
+    {
+        /** @var int $realSize */
+        $realSize = (PHP_INT_SIZE << 3) - 1;
+        if ($size) {
+            --$size;
+        } else {
+            /** @var int $size */
+            $size = $realSize;
+        }
+
+        $negative = -(($integer >> $size) & 1);
+        return (int) (
+            ($integer ^ $negative)
+                +
+            (($negative >> $realSize) & 1)
+        );
+    }
+
+    /**
+     * Convert a binary string into a hexadecimal string without cache-timing
+     * leaks
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $binaryString (raw binary)
+     * @return string
+     * @throws TypeError
+     */
+    public static function bin2hex($binaryString)
+    {
+        /* Type checks: */
+        if (!is_string($binaryString)) {
+            throw new TypeError('Argument 1 must be a string, ' . gettype($binaryString) . ' given.');
+        }
+
+        $hex = '';
+        $len = self::strlen($binaryString);
+        for ($i = 0; $i < $len; ++$i) {
+            /** @var array<int, int> $chunk */
+            $chunk = unpack('C', $binaryString[$i]);
+            /** @var int $c */
+            $c = $chunk[1] & 0xf;
+            /** @var int $b */
+            $b = $chunk[1] >> 4;
+            $hex .= pack(
+                'CC',
+                (87 + $b + ((($b - 10) >> 8) & ~38)),
+                (87 + $c + ((($c - 10) >> 8) & ~38))
+            );
+        }
+        return $hex;
+    }
+
+    /**
+     * Convert a binary string into a hexadecimal string without cache-timing
+     * leaks, returning uppercase letters (as per RFC 4648)
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $bin_string (raw binary)
+     * @return string
+     * @throws TypeError
+     */
+    public static function bin2hexUpper($bin_string)
+    {
+        $hex = '';
+        $len = self::strlen($bin_string);
+        for ($i = 0; $i < $len; ++$i) {
+            /** @var array<int, int> $chunk */
+            $chunk = unpack('C', $bin_string[$i]);
+            /**
+             * Lower 16 bits
+             *
+             * @var int $c
+             */
+            $c = $chunk[1] & 0xf;
+
+            /**
+             * Upper 16 bits
+             * @var int $b
+             */
+            $b = $chunk[1] >> 4;
+
+            /**
+             * Use pack() and binary operators to turn the two integers
+             * into hexadecimal characters. We don't use chr() here, because
+             * it uses a lookup table internally and we want to avoid
+             * cache-timing side-channels.
+             */
+            $hex .= pack(
+                'CC',
+                (55 + $b + ((($b - 10) >> 8) & ~6)),
+                (55 + $c + ((($c - 10) >> 8) & ~6))
+            );
+        }
+        return $hex;
+    }
+
+    /**
+     * Cache-timing-safe variant of ord()
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $chr
+     * @return int
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function chrToInt($chr)
+    {
+        /* Type checks: */
+        if (!is_string($chr)) {
+            throw new TypeError('Argument 1 must be a string, ' . gettype($chr) . ' given.');
+        }
+        if (self::strlen($chr) !== 1) {
+            throw new SodiumException('chrToInt() expects a string that is exactly 1 character long');
+        }
+        /** @var array<int, int> $chunk */
+        $chunk = unpack('C', $chr);
+        return (int) ($chunk[1]);
+    }
+
+    /**
+     * Compares two strings.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $left
+     * @param string $right
+     * @param int $len
+     * @return int
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function compare($left, $right, $len = null)
+    {
+        $leftLen = self::strlen($left);
+        $rightLen = self::strlen($right);
+        if ($len === null) {
+            $len = max($leftLen, $rightLen);
+            $left = str_pad($left, $len, "\x00", STR_PAD_RIGHT);
+            $right = str_pad($right, $len, "\x00", STR_PAD_RIGHT);
+        }
+
+        $gt = 0;
+        $eq = 1;
+        $i = $len;
+        while ($i !== 0) {
+            --$i;
+            $gt |= ((self::chrToInt($right[$i]) - self::chrToInt($left[$i])) >> 8) & $eq;
+            $eq &= ((self::chrToInt($right[$i]) ^ self::chrToInt($left[$i])) - 1) >> 8;
+        }
+        return ($gt + $gt + $eq) - 1;
+    }
+
+    /**
+     * If a variable does not match a given type, throw a TypeError.
+     *
+     * @param mixed $mixedVar
+     * @param string $type
+     * @param int $argumentIndex
+     * @throws TypeError
+     * @throws SodiumException
+     * @return void
+     */
+    public static function declareScalarType(&$mixedVar = null, $type = 'void', $argumentIndex = 0)
+    {
+        if (func_num_args() === 0) {
+            /* Tautology, by default */
+            return;
+        }
+        if (func_num_args() === 1) {
+            throw new TypeError('Declared void, but passed a variable');
+        }
+        $realType = strtolower(gettype($mixedVar));
+        $type = strtolower($type);
+        switch ($type) {
+            case 'null':
+                if ($mixedVar !== null) {
+                    throw new TypeError('Argument ' . $argumentIndex . ' must be null, ' . $realType . ' given.');
+                }
+                break;
+            case 'integer':
+            case 'int':
+                $allow = array('int', 'integer');
+                if (!in_array($type, $allow)) {
+                    throw new TypeError('Argument ' . $argumentIndex . ' must be an integer, ' . $realType . ' given.');
+                }
+                $mixedVar = (int) $mixedVar;
+                break;
+            case 'boolean':
+            case 'bool':
+                $allow = array('bool', 'boolean');
+                if (!in_array($type, $allow)) {
+                    throw new TypeError('Argument ' . $argumentIndex . ' must be a boolean, ' . $realType . ' given.');
+                }
+                $mixedVar = (bool) $mixedVar;
+                break;
+            case 'string':
+                if (!is_string($mixedVar)) {
+                    throw new TypeError('Argument ' . $argumentIndex . ' must be a string, ' . $realType . ' given.');
+                }
+                $mixedVar = (string) $mixedVar;
+                break;
+            case 'decimal':
+            case 'double':
+            case 'float':
+                $allow = array('decimal', 'double', 'float');
+                if (!in_array($type, $allow)) {
+                    throw new TypeError('Argument ' . $argumentIndex . ' must be a float, ' . $realType . ' given.');
+                }
+                $mixedVar = (float) $mixedVar;
+                break;
+            case 'object':
+                if (!is_object($mixedVar)) {
+                    throw new TypeError('Argument ' . $argumentIndex . ' must be an object, ' . $realType . ' given.');
+                }
+                break;
+            case 'array':
+                if (!is_array($mixedVar)) {
+                    if (is_object($mixedVar)) {
+                        if ($mixedVar instanceof ArrayAccess) {
+                            return;
+                        }
+                    }
+                    throw new TypeError('Argument ' . $argumentIndex . ' must be an array, ' . $realType . ' given.');
+                }
+                break;
+            default:
+                throw new SodiumException('Unknown type (' . $realType .') does not match expect type (' . $type . ')');
+        }
+    }
+
+    /**
+     * Evaluate whether or not two strings are equal (in constant-time)
+     *
+     * @param string $left
+     * @param string $right
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function hashEquals($left, $right)
+    {
+        /* Type checks: */
+        if (!is_string($left)) {
+            throw new TypeError('Argument 1 must be a string, ' . gettype($left) . ' given.');
+        }
+        if (!is_string($right)) {
+            throw new TypeError('Argument 2 must be a string, ' . gettype($right) . ' given.');
+        }
+
+        if (is_callable('hash_equals')) {
+            return hash_equals($left, $right);
+        }
+        $d = 0;
+        /** @var int $len */
+        $len = self::strlen($left);
+        if ($len !== self::strlen($right)) {
+            return false;
+        }
+        for ($i = 0; $i < $len; ++$i) {
+            $d |= self::chrToInt($left[$i]) ^ self::chrToInt($right[$i]);
+        }
+
+        if ($d !== 0) {
+            return false;
+        }
+        return $left === $right;
+    }
+
+    /**
+     * Catch hash_update() failures and throw instead of silently proceding
+     *
+     * @param HashContext|resource &$hs
+     * @param string $data
+     * @return void
+     * @throws SodiumException
+     * @psalm-suppress PossiblyInvalidArgument
+     */
+    protected static function hash_update(&$hs, $data)
+    {
+        if (!hash_update($hs, $data)) {
+            throw new SodiumException('hash_update() failed');
+        }
+    }
+
+    /**
+     * Convert a hexadecimal string into a binary string without cache-timing
+     * leaks
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $hexString
+     * @param bool $strictPadding
+     * @return string (raw binary)
+     * @throws RangeException
+     * @throws TypeError
+     */
+    public static function hex2bin($hexString, $strictPadding = false)
+    {
+        /* Type checks: */
+        if (!is_string($hexString)) {
+            throw new TypeError('Argument 1 must be a string, ' . gettype($hexString) . ' given.');
+        }
+
+        /** @var int $hex_pos */
+        $hex_pos = 0;
+        /** @var string $bin */
+        $bin = '';
+        /** @var int $c_acc */
+        $c_acc = 0;
+        /** @var int $hex_len */
+        $hex_len = self::strlen($hexString);
+        /** @var int $state */
+        $state = 0;
+        if (($hex_len & 1) !== 0) {
+            if ($strictPadding) {
+                throw new RangeException(
+                    'Expected an even number of hexadecimal characters'
+                );
+            } else {
+                $hexString = '0' . $hexString;
+                ++$hex_len;
+            }
+        }
+
+        $chunk = unpack('C*', $hexString);
+        while ($hex_pos < $hex_len) {
+            ++$hex_pos;
+            /** @var int $c */
+            $c = $chunk[$hex_pos];
+            /** @var int $c_num */
+            $c_num = $c ^ 48;
+            /** @var int $c_num0 */
+            $c_num0 = ($c_num - 10) >> 8;
+            /** @var int $c_alpha */
+            $c_alpha = ($c & ~32) - 55;
+            /** @var int $c_alpha0 */
+            $c_alpha0 = (($c_alpha - 10) ^ ($c_alpha - 16)) >> 8;
+            if (($c_num0 | $c_alpha0) === 0) {
+                throw new RangeException(
+                    'hex2bin() only expects hexadecimal characters'
+                );
+            }
+            /** @var int $c_val */
+            $c_val = ($c_num0 & $c_num) | ($c_alpha & $c_alpha0);
+            if ($state === 0) {
+                $c_acc = $c_val * 16;
+            } else {
+                $bin .= pack('C', $c_acc | $c_val);
+            }
+            $state ^= 1;
+        }
+        return $bin;
+    }
+
+    /**
+     * Turn an array of integers into a string
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param array<int, int> $ints
+     * @return string
+     */
+    public static function intArrayToString(array $ints)
+    {
+        /** @var array<int, int> $args */
+        $args = $ints;
+        foreach ($args as $i => $v) {
+            $args[$i] = (int) ($v & 0xff);
+        }
+        array_unshift($args, str_repeat('C', count($ints)));
+        return (string) (call_user_func_array('pack', $args));
+    }
+
+    /**
+     * Cache-timing-safe variant of ord()
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param int $int
+     * @return string
+     * @throws TypeError
+     */
+    public static function intToChr($int)
+    {
+        return pack('C', $int);
+    }
+
+    /**
+     * Load a 3 character substring into an integer
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $string
+     * @return int
+     * @throws RangeException
+     * @throws TypeError
+     */
+    public static function load_3($string)
+    {
+        /* Type checks: */
+        if (!is_string($string)) {
+            throw new TypeError('Argument 1 must be a string, ' . gettype($string) . ' given.');
+        }
+
+        /* Input validation: */
+        if (self::strlen($string) < 3) {
+            throw new RangeException(
+                'String must be 3 bytes or more; ' . self::strlen($string) . ' given.'
+            );
+        }
+        /** @var array<int, int> $unpacked */
+        $unpacked = unpack('V', $string . "\0");
+        return (int) ($unpacked[1] & 0xffffff);
+    }
+
+    /**
+     * Load a 4 character substring into an integer
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $string
+     * @return int
+     * @throws RangeException
+     * @throws TypeError
+     */
+    public static function load_4($string)
+    {
+        /* Type checks: */
+        if (!is_string($string)) {
+            throw new TypeError('Argument 1 must be a string, ' . gettype($string) . ' given.');
+        }
+
+        /* Input validation: */
+        if (self::strlen($string) < 4) {
+            throw new RangeException(
+                'String must be 4 bytes or more; ' . self::strlen($string) . ' given.'
+            );
+        }
+        /** @var array<int, int> $unpacked */
+        $unpacked = unpack('V', $string);
+        return (int) ($unpacked[1] & 0xffffffff);
+    }
+
+    /**
+     * Load a 8 character substring into an integer
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $string
+     * @return int
+     * @throws RangeException
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function load64_le($string)
+    {
+        /* Type checks: */
+        if (!is_string($string)) {
+            throw new TypeError('Argument 1 must be a string, ' . gettype($string) . ' given.');
+        }
+
+        /* Input validation: */
+        if (self::strlen($string) < 4) {
+            throw new RangeException(
+                'String must be 4 bytes or more; ' . self::strlen($string) . ' given.'
+            );
+        }
+        if (PHP_VERSION_ID >= 50603 && PHP_INT_SIZE === 8) {
+            /** @var array<int, int> $unpacked */
+            $unpacked = unpack('P', $string);
+            return (int) $unpacked[1];
+        }
+
+        /** @var int $result */
+        $result  = (self::chrToInt($string[0]) & 0xff);
+        $result |= (self::chrToInt($string[1]) & 0xff) <<  8;
+        $result |= (self::chrToInt($string[2]) & 0xff) << 16;
+        $result |= (self::chrToInt($string[3]) & 0xff) << 24;
+        $result |= (self::chrToInt($string[4]) & 0xff) << 32;
+        $result |= (self::chrToInt($string[5]) & 0xff) << 40;
+        $result |= (self::chrToInt($string[6]) & 0xff) << 48;
+        $result |= (self::chrToInt($string[7]) & 0xff) << 56;
+        return (int) $result;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $left
+     * @param string $right
+     * @return int
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function memcmp($left, $right)
+    {
+        if (self::hashEquals($left, $right)) {
+            return 0;
+        }
+        return -1;
+    }
+
+    /**
+     * Multiply two integers in constant-time
+     *
+     * Micro-architecture timing side-channels caused by how your CPU
+     * implements multiplication are best prevented by never using the
+     * multiplication operators and ensuring that our code always takes
+     * the same number of operations to complete, regardless of the values
+     * of $a and $b.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param int $a
+     * @param int $b
+     * @param int $size Limits the number of operations (useful for small,
+     *                  constant operands)
+     * @return int
+     */
+    public static function mul($a, $b, $size = 0)
+    {
+        if (ParagonIE_Sodium_Compat::$fastMult) {
+            return (int) ($a * $b);
+        }
+
+        static $defaultSize = null;
+        /** @var int $defaultSize */
+        if (!$defaultSize) {
+            /** @var int $defaultSize */
+            $defaultSize = (PHP_INT_SIZE << 3) - 1;
+        }
+        if ($size < 1) {
+            /** @var int $size */
+            $size = $defaultSize;
+        }
+        /** @var int $size */
+
+        $c = 0;
+
+        /**
+         * Mask is either -1 or 0.
+         *
+         * -1 in binary looks like 0x1111 ... 1111
+         *  0 in binary looks like 0x0000 ... 0000
+         *
+         * @var int
+         */
+        $mask = -(($b >> ((int) $defaultSize)) & 1);
+
+        /**
+         * Ensure $b is a positive integer, without creating
+         * a branching side-channel
+         *
+         * @var int $b
+         */
+        $b = ($b & ~$mask) | ($mask & -$b);
+
+        /**
+         * Unless $size is provided:
+         *
+         * This loop always runs 32 times when PHP_INT_SIZE is 4.
+         * This loop always runs 64 times when PHP_INT_SIZE is 8.
+         */
+        for ($i = $size; $i >= 0; --$i) {
+            $c += (int) ($a & -($b & 1));
+            $a <<= 1;
+            $b >>= 1;
+        }
+
+        /**
+         * If $b was negative, we then apply the same value to $c here.
+         * It doesn't matter much if $a was negative; the $c += above would
+         * have produced a negative integer to begin with. But a negative $b
+         * makes $b >>= 1 never return 0, so we would end up with incorrect
+         * results.
+         *
+         * The end result is what we'd expect from integer multiplication.
+         */
+        return (int) (($c & ~$mask) | ($mask & -$c));
+    }
+
+    /**
+     * Convert any arbitrary numbers into two 32-bit integers that represent
+     * a 64-bit integer.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param int|float $num
+     * @return array<int, int>
+     */
+    public static function numericTo64BitInteger($num)
+    {
+        $high = 0;
+        /** @var int $low */
+        $low = $num & 0xffffffff;
+
+        if ((+(abs($num))) >= 1) {
+            if ($num > 0) {
+                /** @var int $high */
+                $high = min((+(floor($num/4294967296))), 4294967295);
+            } else {
+                /** @var int $high */
+                $high = ~~((+(ceil(($num - (+((~~($num)))))/4294967296))));
+            }
+        }
+        return array((int) $high, (int) $low);
+    }
+
+    /**
+     * Store a 24-bit integer into a string, treating it as big-endian.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param int $int
+     * @return string
+     * @throws TypeError
+     */
+    public static function store_3($int)
+    {
+        /* Type checks: */
+        if (!is_int($int)) {
+            if (is_numeric($int)) {
+                $int = (int) $int;
+            } else {
+                throw new TypeError('Argument 1 must be an integer, ' . gettype($int) . ' given.');
+            }
+        }
+        /** @var string $packed */
+        $packed = pack('N', $int);
+        return self::substr($packed, 1, 3);
+    }
+
+    /**
+     * Store a 32-bit integer into a string, treating it as little-endian.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param int $int
+     * @return string
+     * @throws TypeError
+     */
+    public static function store32_le($int)
+    {
+        /* Type checks: */
+        if (!is_int($int)) {
+            if (is_numeric($int)) {
+                $int = (int) $int;
+            } else {
+                throw new TypeError('Argument 1 must be an integer, ' . gettype($int) . ' given.');
+            }
+        }
+
+        /** @var string $packed */
+        $packed = pack('V', $int);
+        return $packed;
+    }
+
+    /**
+     * Store a 32-bit integer into a string, treating it as big-endian.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param int $int
+     * @return string
+     * @throws TypeError
+     */
+    public static function store_4($int)
+    {
+        /* Type checks: */
+        if (!is_int($int)) {
+            if (is_numeric($int)) {
+                $int = (int) $int;
+            } else {
+                throw new TypeError('Argument 1 must be an integer, ' . gettype($int) . ' given.');
+            }
+        }
+
+        /** @var string $packed */
+        $packed = pack('N', $int);
+        return $packed;
+    }
+
+    /**
+     * Stores a 64-bit integer as an string, treating it as little-endian.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param int $int
+     * @return string
+     * @throws TypeError
+     */
+    public static function store64_le($int)
+    {
+        /* Type checks: */
+        if (!is_int($int)) {
+            if (is_numeric($int)) {
+                $int = (int) $int;
+            } else {
+                throw new TypeError('Argument 1 must be an integer, ' . gettype($int) . ' given.');
+            }
+        }
+
+        if (PHP_INT_SIZE === 8) {
+            if (PHP_VERSION_ID >= 50603) {
+                /** @var string $packed */
+                $packed = pack('P', $int);
+                return $packed;
+            }
+            return self::intToChr($int & 0xff) .
+                self::intToChr(($int >>  8) & 0xff) .
+                self::intToChr(($int >> 16) & 0xff) .
+                self::intToChr(($int >> 24) & 0xff) .
+                self::intToChr(($int >> 32) & 0xff) .
+                self::intToChr(($int >> 40) & 0xff) .
+                self::intToChr(($int >> 48) & 0xff) .
+                self::intToChr(($int >> 56) & 0xff);
+        }
+        if ($int > PHP_INT_MAX) {
+            list($hiB, $int) = self::numericTo64BitInteger($int);
+        } else {
+            $hiB = 0;
+        }
+        return
+            self::intToChr(($int      ) & 0xff) .
+            self::intToChr(($int >>  8) & 0xff) .
+            self::intToChr(($int >> 16) & 0xff) .
+            self::intToChr(($int >> 24) & 0xff) .
+            self::intToChr($hiB & 0xff) .
+            self::intToChr(($hiB >>  8) & 0xff) .
+            self::intToChr(($hiB >> 16) & 0xff) .
+            self::intToChr(($hiB >> 24) & 0xff);
+    }
+
+    /**
+     * Safe string length
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @ref mbstring.func_overload
+     *
+     * @param string $str
+     * @return int
+     * @throws TypeError
+     */
+    public static function strlen($str)
+    {
+        /* Type checks: */
+        if (!is_string($str)) {
+            throw new TypeError('String expected');
+        }
+
+        return (int) (
+        self::isMbStringOverride()
+            ? mb_strlen($str, '8bit')
+            : strlen($str)
+        );
+    }
+
+    /**
+     * Turn a string into an array of integers
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $string
+     * @return array<int, int>
+     * @throws TypeError
+     */
+    public static function stringToIntArray($string)
+    {
+        if (!is_string($string)) {
+            throw new TypeError('String expected');
+        }
+        /**
+         * @var array<int, int>
+         */
+        $values = array_values(
+            unpack('C*', $string)
+        );
+        return $values;
+    }
+
+    /**
+     * Safe substring
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @ref mbstring.func_overload
+     *
+     * @param string $str
+     * @param int $start
+     * @param int $length
+     * @return string
+     * @throws TypeError
+     */
+    public static function substr($str, $start = 0, $length = null)
+    {
+        /* Type checks: */
+        if (!is_string($str)) {
+            throw new TypeError('String expected');
+        }
+
+        if ($length === 0) {
+            return '';
+        }
+
+        if (self::isMbStringOverride()) {
+            if (PHP_VERSION_ID < 50400 && $length === null) {
+                $length = self::strlen($str);
+            }
+            $sub = (string) mb_substr($str, $start, $length, '8bit');
+        } elseif ($length === null) {
+            $sub = (string) substr($str, $start);
+        } else {
+            $sub = (string) substr($str, $start, $length);
+        }
+        if ($sub !== '') {
+            return $sub;
+        }
+        return '';
+    }
+
+    /**
+     * Compare a 16-character byte string in constant time.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $a
+     * @param string $b
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function verify_16($a, $b)
+    {
+        /* Type checks: */
+        if (!is_string($a)) {
+            throw new TypeError('String expected');
+        }
+        if (!is_string($b)) {
+            throw new TypeError('String expected');
+        }
+        return self::hashEquals(
+            self::substr($a, 0, 16),
+            self::substr($b, 0, 16)
+        );
+    }
+
+    /**
+     * Compare a 32-character byte string in constant time.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $a
+     * @param string $b
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function verify_32($a, $b)
+    {
+        /* Type checks: */
+        if (!is_string($a)) {
+            throw new TypeError('String expected');
+        }
+        if (!is_string($b)) {
+            throw new TypeError('String expected');
+        }
+        return self::hashEquals(
+            self::substr($a, 0, 32),
+            self::substr($b, 0, 32)
+        );
+    }
+
+    /**
+     * Calculate $a ^ $b for two strings.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $a
+     * @param string $b
+     * @return string
+     * @throws TypeError
+     */
+    public static function xorStrings($a, $b)
+    {
+        /* Type checks: */
+        if (!is_string($a)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (!is_string($b)) {
+            throw new TypeError('Argument 2 must be a string');
+        }
+
+        return (string) ($a ^ $b);
+    }
+
+    /**
+     * Returns whether or not mbstring.func_overload is in effect.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * Note: MB_OVERLOAD_STRING === 2, but we don't reference the constant
+     * (for nuisance-free PHP 8 support)
+     *
+     * @return bool
+     */
+    protected static function isMbStringOverride()
+    {
+        static $mbstring = null;
+
+        if ($mbstring === null) {
+            $mbstring = extension_loaded('mbstring')
+                && defined('MB_OVERLOAD_STRING')
+                &&
+            ((int) (ini_get('mbstring.func_overload')) & 2);
+            // MB_OVERLOAD_STRING === 2
+        }
+        /** @var bool $mbstring */
+
+        return $mbstring;
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core/X25519.php b/vendor/paragonie/sodium_compat/src/Core/X25519.php
new file mode 100644
index 0000000..732bb65
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core/X25519.php
@@ -0,0 +1,327 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core_X25519', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core_X25519
+ */
+abstract class ParagonIE_Sodium_Core_X25519 extends ParagonIE_Sodium_Core_Curve25519
+{
+    /**
+     * Alters the objects passed to this method in place.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $g
+     * @param int $b
+     * @return void
+     * @psalm-suppress MixedAssignment
+     */
+    public static function fe_cswap(
+        ParagonIE_Sodium_Core_Curve25519_Fe $f,
+        ParagonIE_Sodium_Core_Curve25519_Fe $g,
+        $b = 0
+    ) {
+        $f0 = (int) $f[0];
+        $f1 = (int) $f[1];
+        $f2 = (int) $f[2];
+        $f3 = (int) $f[3];
+        $f4 = (int) $f[4];
+        $f5 = (int) $f[5];
+        $f6 = (int) $f[6];
+        $f7 = (int) $f[7];
+        $f8 = (int) $f[8];
+        $f9 = (int) $f[9];
+        $g0 = (int) $g[0];
+        $g1 = (int) $g[1];
+        $g2 = (int) $g[2];
+        $g3 = (int) $g[3];
+        $g4 = (int) $g[4];
+        $g5 = (int) $g[5];
+        $g6 = (int) $g[6];
+        $g7 = (int) $g[7];
+        $g8 = (int) $g[8];
+        $g9 = (int) $g[9];
+        $b = -$b;
+        $x0 = ($f0 ^ $g0) & $b;
+        $x1 = ($f1 ^ $g1) & $b;
+        $x2 = ($f2 ^ $g2) & $b;
+        $x3 = ($f3 ^ $g3) & $b;
+        $x4 = ($f4 ^ $g4) & $b;
+        $x5 = ($f5 ^ $g5) & $b;
+        $x6 = ($f6 ^ $g6) & $b;
+        $x7 = ($f7 ^ $g7) & $b;
+        $x8 = ($f8 ^ $g8) & $b;
+        $x9 = ($f9 ^ $g9) & $b;
+        $f[0] = $f0 ^ $x0;
+        $f[1] = $f1 ^ $x1;
+        $f[2] = $f2 ^ $x2;
+        $f[3] = $f3 ^ $x3;
+        $f[4] = $f4 ^ $x4;
+        $f[5] = $f5 ^ $x5;
+        $f[6] = $f6 ^ $x6;
+        $f[7] = $f7 ^ $x7;
+        $f[8] = $f8 ^ $x8;
+        $f[9] = $f9 ^ $x9;
+        $g[0] = $g0 ^ $x0;
+        $g[1] = $g1 ^ $x1;
+        $g[2] = $g2 ^ $x2;
+        $g[3] = $g3 ^ $x3;
+        $g[4] = $g4 ^ $x4;
+        $g[5] = $g5 ^ $x5;
+        $g[6] = $g6 ^ $x6;
+        $g[7] = $g7 ^ $x7;
+        $g[8] = $g8 ^ $x8;
+        $g[9] = $g9 ^ $x9;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
+     * @return ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public static function fe_mul121666(ParagonIE_Sodium_Core_Curve25519_Fe $f)
+    {
+        $h = array(
+            self::mul((int) $f[0], 121666, 17),
+            self::mul((int) $f[1], 121666, 17),
+            self::mul((int) $f[2], 121666, 17),
+            self::mul((int) $f[3], 121666, 17),
+            self::mul((int) $f[4], 121666, 17),
+            self::mul((int) $f[5], 121666, 17),
+            self::mul((int) $f[6], 121666, 17),
+            self::mul((int) $f[7], 121666, 17),
+            self::mul((int) $f[8], 121666, 17),
+            self::mul((int) $f[9], 121666, 17)
+        );
+
+        /** @var int $carry9 */
+        $carry9 = ($h[9] + (1 << 24)) >> 25;
+        $h[0] += self::mul($carry9, 19, 5);
+        $h[9] -= $carry9 << 25;
+        /** @var int $carry1 */
+        $carry1 = ($h[1] + (1 << 24)) >> 25;
+        $h[2] += $carry1;
+        $h[1] -= $carry1 << 25;
+        /** @var int $carry3 */
+        $carry3 = ($h[3] + (1 << 24)) >> 25;
+        $h[4] += $carry3;
+        $h[3] -= $carry3 << 25;
+        /** @var int $carry5 */
+        $carry5 = ($h[5] + (1 << 24)) >> 25;
+        $h[6] += $carry5;
+        $h[5] -= $carry5 << 25;
+        /** @var int $carry7 */
+        $carry7 = ($h[7] + (1 << 24)) >> 25;
+        $h[8] += $carry7;
+        $h[7] -= $carry7 << 25;
+
+        /** @var int $carry0 */
+        $carry0 = ($h[0] + (1 << 25)) >> 26;
+        $h[1] += $carry0;
+        $h[0] -= $carry0 << 26;
+        /** @var int $carry2 */
+        $carry2 = ($h[2] + (1 << 25)) >> 26;
+        $h[3] += $carry2;
+        $h[2] -= $carry2 << 26;
+        /** @var int $carry4 */
+        $carry4 = ($h[4] + (1 << 25)) >> 26;
+        $h[5] += $carry4;
+        $h[4] -= $carry4 << 26;
+        /** @var int $carry6 */
+        $carry6 = ($h[6] + (1 << 25)) >> 26;
+        $h[7] += $carry6;
+        $h[6] -= $carry6 << 26;
+        /** @var int $carry8 */
+        $carry8 = ($h[8] + (1 << 25)) >> 26;
+        $h[9] += $carry8;
+        $h[8] -= $carry8 << 26;
+
+        foreach ($h as $i => $value) {
+            $h[$i] = (int) $value;
+        }
+        return ParagonIE_Sodium_Core_Curve25519_Fe::fromArray($h);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * Inline comments preceded by # are from libsodium's ref10 code.
+     *
+     * @param string $n
+     * @param string $p
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function crypto_scalarmult_curve25519_ref10($n, $p)
+    {
+        # for (i = 0;i < 32;++i) e[i] = n[i];
+        $e = '' . $n;
+        # e[0] &= 248;
+        $e[0] = self::intToChr(
+            self::chrToInt($e[0]) & 248
+        );
+        # e[31] &= 127;
+        # e[31] |= 64;
+        $e[31] = self::intToChr(
+            (self::chrToInt($e[31]) & 127) | 64
+        );
+        # fe_frombytes(x1,p);
+        $x1 = self::fe_frombytes($p);
+        # fe_1(x2);
+        $x2 = self::fe_1();
+        # fe_0(z2);
+        $z2 = self::fe_0();
+        # fe_copy(x3,x1);
+        $x3 = self::fe_copy($x1);
+        # fe_1(z3);
+        $z3 = self::fe_1();
+
+        # swap = 0;
+        /** @var int $swap */
+        $swap = 0;
+
+        # for (pos = 254;pos >= 0;--pos) {
+        for ($pos = 254; $pos >= 0; --$pos) {
+            # b = e[pos / 8] >> (pos & 7);
+            /** @var int $b */
+            $b = self::chrToInt(
+                    $e[(int) floor($pos / 8)]
+                ) >> ($pos & 7);
+            # b &= 1;
+            $b &= 1;
+            # swap ^= b;
+            $swap ^= $b;
+            # fe_cswap(x2,x3,swap);
+            self::fe_cswap($x2, $x3, $swap);
+            # fe_cswap(z2,z3,swap);
+            self::fe_cswap($z2, $z3, $swap);
+            # swap = b;
+            $swap = $b;
+            # fe_sub(tmp0,x3,z3);
+            $tmp0 = self::fe_sub($x3, $z3);
+            # fe_sub(tmp1,x2,z2);
+            $tmp1 = self::fe_sub($x2, $z2);
+
+            # fe_add(x2,x2,z2);
+            $x2 = self::fe_add($x2, $z2);
+
+            # fe_add(z2,x3,z3);
+            $z2 = self::fe_add($x3, $z3);
+
+            # fe_mul(z3,tmp0,x2);
+            $z3 = self::fe_mul($tmp0, $x2);
+
+            # fe_mul(z2,z2,tmp1);
+            $z2 = self::fe_mul($z2, $tmp1);
+
+            # fe_sq(tmp0,tmp1);
+            $tmp0 = self::fe_sq($tmp1);
+
+            # fe_sq(tmp1,x2);
+            $tmp1 = self::fe_sq($x2);
+
+            # fe_add(x3,z3,z2);
+            $x3 = self::fe_add($z3, $z2);
+
+            # fe_sub(z2,z3,z2);
+            $z2 = self::fe_sub($z3, $z2);
+
+            # fe_mul(x2,tmp1,tmp0);
+            $x2 = self::fe_mul($tmp1, $tmp0);
+
+            # fe_sub(tmp1,tmp1,tmp0);
+            $tmp1 = self::fe_sub($tmp1, $tmp0);
+
+            # fe_sq(z2,z2);
+            $z2 = self::fe_sq($z2);
+
+            # fe_mul121666(z3,tmp1);
+            $z3 = self::fe_mul121666($tmp1);
+
+            # fe_sq(x3,x3);
+            $x3 = self::fe_sq($x3);
+
+            # fe_add(tmp0,tmp0,z3);
+            $tmp0 = self::fe_add($tmp0, $z3);
+
+            # fe_mul(z3,x1,z2);
+            $z3 = self::fe_mul($x1, $z2);
+
+            # fe_mul(z2,tmp1,tmp0);
+            $z2 = self::fe_mul($tmp1, $tmp0);
+        }
+
+        # fe_cswap(x2,x3,swap);
+        self::fe_cswap($x2, $x3, $swap);
+
+        # fe_cswap(z2,z3,swap);
+        self::fe_cswap($z2, $z3, $swap);
+
+        # fe_invert(z2,z2);
+        $z2 = self::fe_invert($z2);
+
+        # fe_mul(x2,x2,z2);
+        $x2 = self::fe_mul($x2, $z2);
+        # fe_tobytes(q,x2);
+        return self::fe_tobytes($x2);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $edwardsY
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $edwardsZ
+     * @return ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public static function edwards_to_montgomery(
+        ParagonIE_Sodium_Core_Curve25519_Fe $edwardsY,
+        ParagonIE_Sodium_Core_Curve25519_Fe $edwardsZ
+    ) {
+        $tempX = self::fe_add($edwardsZ, $edwardsY);
+        $tempZ = self::fe_sub($edwardsZ, $edwardsY);
+        $tempZ = self::fe_invert($tempZ);
+        return self::fe_mul($tempX, $tempZ);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $n
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function crypto_scalarmult_curve25519_ref10_base($n)
+    {
+        # for (i = 0;i < 32;++i) e[i] = n[i];
+        $e = '' . $n;
+
+        # e[0] &= 248;
+        $e[0] = self::intToChr(
+            self::chrToInt($e[0]) & 248
+        );
+
+        # e[31] &= 127;
+        # e[31] |= 64;
+        $e[31] = self::intToChr(
+            (self::chrToInt($e[31]) & 127) | 64
+        );
+
+        $A = self::ge_scalarmult_base($e);
+        if (
+            !($A->Y instanceof ParagonIE_Sodium_Core_Curve25519_Fe)
+                ||
+            !($A->Z instanceof ParagonIE_Sodium_Core_Curve25519_Fe)
+        ) {
+            throw new TypeError('Null points encountered');
+        }
+        $pk = self::edwards_to_montgomery($A->Y, $A->Z);
+        return self::fe_tobytes($pk);
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core/XChaCha20.php b/vendor/paragonie/sodium_compat/src/Core/XChaCha20.php
new file mode 100644
index 0000000..39e717b
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core/XChaCha20.php
@@ -0,0 +1,117 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core_XChaCha20', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core_XChaCha20
+ */
+class ParagonIE_Sodium_Core_XChaCha20 extends ParagonIE_Sodium_Core_HChaCha20
+{
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param int $len
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function stream($len = 64, $nonce = '', $key = '')
+    {
+        if (self::strlen($nonce) !== 24) {
+            throw new SodiumException('Nonce must be 24 bytes long');
+        }
+        return self::encryptBytes(
+            new ParagonIE_Sodium_Core_ChaCha20_Ctx(
+                self::hChaCha20(
+                    self::substr($nonce, 0, 16),
+                    $key
+                ),
+                self::substr($nonce, 16, 8)
+            ),
+            str_repeat("\x00", $len)
+        );
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param int $len
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function ietfStream($len = 64, $nonce = '', $key = '')
+    {
+        if (self::strlen($nonce) !== 24) {
+            throw new SodiumException('Nonce must be 24 bytes long');
+        }
+        return self::encryptBytes(
+            new ParagonIE_Sodium_Core_ChaCha20_IetfCtx(
+                self::hChaCha20(
+                    self::substr($nonce, 0, 16),
+                    $key
+                ),
+                "\x00\x00\x00\x00" . self::substr($nonce, 16, 8)
+            ),
+            str_repeat("\x00", $len)
+        );
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $message
+     * @param string $nonce
+     * @param string $key
+     * @param string $ic
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function streamXorIc($message, $nonce = '', $key = '', $ic = '')
+    {
+        if (self::strlen($nonce) !== 24) {
+            throw new SodiumException('Nonce must be 24 bytes long');
+        }
+        return self::encryptBytes(
+            new ParagonIE_Sodium_Core_ChaCha20_Ctx(
+                self::hChaCha20(self::substr($nonce, 0, 16), $key),
+                self::substr($nonce, 16, 8),
+                $ic
+            ),
+            $message
+        );
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $message
+     * @param string $nonce
+     * @param string $key
+     * @param string $ic
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function ietfStreamXorIc($message, $nonce = '', $key = '', $ic = '')
+    {
+        if (self::strlen($nonce) !== 24) {
+            throw new SodiumException('Nonce must be 24 bytes long');
+        }
+        return self::encryptBytes(
+            new ParagonIE_Sodium_Core_ChaCha20_IetfCtx(
+                self::hChaCha20(self::substr($nonce, 0, 16), $key),
+                "\x00\x00\x00\x00" . self::substr($nonce, 16, 8),
+                $ic
+            ),
+            $message
+        );
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core/XSalsa20.php b/vendor/paragonie/sodium_compat/src/Core/XSalsa20.php
new file mode 100644
index 0000000..9ef989e
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core/XSalsa20.php
@@ -0,0 +1,57 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core_XSalsa20', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core_XSalsa20
+ */
+abstract class ParagonIE_Sodium_Core_XSalsa20 extends ParagonIE_Sodium_Core_HSalsa20
+{
+    /**
+     * Expand a key and nonce into an xsalsa20 keystream.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param int $len
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function xsalsa20($len, $nonce, $key)
+    {
+        $ret = self::salsa20(
+            $len,
+            self::substr($nonce, 16, 8),
+            self::hsalsa20($nonce, $key)
+        );
+        return $ret;
+    }
+
+    /**
+     * Encrypt a string with XSalsa20. Doesn't provide integrity.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $message
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function xsalsa20_xor($message, $nonce, $key)
+    {
+        return self::xorStrings(
+            $message,
+            self::xsalsa20(
+                self::strlen($message),
+                $nonce,
+                $key
+            )
+        );
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core32/BLAKE2b.php b/vendor/paragonie/sodium_compat/src/Core32/BLAKE2b.php
new file mode 100644
index 0000000..cda1a2c
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core32/BLAKE2b.php
@@ -0,0 +1,719 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core_BLAKE2b', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core_BLAKE2b
+ *
+ * Based on the work of Devi Mandiri in devi/salt.
+ */
+abstract class ParagonIE_Sodium_Core32_BLAKE2b extends ParagonIE_Sodium_Core_Util
+{
+    /**
+     * @var SplFixedArray
+     */
+    public static $iv;
+
+    /**
+     * @var array<int, array<int, int>>
+     */
+    public static $sigma = array(
+        array(  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15),
+        array( 14, 10,  4,  8,  9, 15, 13,  6,  1, 12,  0,  2, 11,  7,  5,  3),
+        array( 11,  8, 12,  0,  5,  2, 15, 13, 10, 14,  3,  6,  7,  1,  9,  4),
+        array(  7,  9,  3,  1, 13, 12, 11, 14,  2,  6,  5, 10,  4,  0, 15,  8),
+        array(  9,  0,  5,  7,  2,  4, 10, 15, 14,  1, 11, 12,  6,  8,  3, 13),
+        array(  2, 12,  6, 10,  0, 11,  8,  3,  4, 13,  7,  5, 15, 14,  1,  9),
+        array( 12,  5,  1, 15, 14, 13,  4, 10,  0,  7,  6,  3,  9,  2,  8, 11),
+        array( 13, 11,  7, 14, 12,  1,  3,  9,  5,  0, 15,  4,  8,  6,  2, 10),
+        array(  6, 15, 14,  9, 11,  3,  0,  8, 12,  2, 13,  7,  1,  4, 10,  5),
+        array( 10,  2,  8,  4,  7,  6,  1,  5, 15, 11,  9, 14,  3, 12, 13 , 0),
+        array(  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15),
+        array( 14, 10,  4,  8,  9, 15, 13,  6,  1, 12,  0,  2, 11,  7,  5,  3)
+    );
+
+    const BLOCKBYTES = 128;
+    const OUTBYTES   = 64;
+    const KEYBYTES   = 64;
+
+    /**
+     * Turn two 32-bit integers into a fixed array representing a 64-bit integer.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param int $high
+     * @param int $low
+     * @return ParagonIE_Sodium_Core32_Int64
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function new64($high, $low)
+    {
+        return ParagonIE_Sodium_Core32_Int64::fromInts($low, $high);
+    }
+
+    /**
+     * Convert an arbitrary number into an SplFixedArray of two 32-bit integers
+     * that represents a 64-bit integer.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param int $num
+     * @return ParagonIE_Sodium_Core32_Int64
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    protected static function to64($num)
+    {
+        list($hi, $lo) = self::numericTo64BitInteger($num);
+        return self::new64($hi, $lo);
+    }
+
+    /**
+     * Adds two 64-bit integers together, returning their sum as a SplFixedArray
+     * containing two 32-bit integers (representing a 64-bit integer).
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Int64 $x
+     * @param ParagonIE_Sodium_Core32_Int64 $y
+     * @return ParagonIE_Sodium_Core32_Int64
+     */
+    protected static function add64($x, $y)
+    {
+        return $x->addInt64($y);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Int64 $x
+     * @param ParagonIE_Sodium_Core32_Int64 $y
+     * @param ParagonIE_Sodium_Core32_Int64 $z
+     * @return ParagonIE_Sodium_Core32_Int64
+     */
+    public static function add364($x, $y, $z)
+    {
+        return $x->addInt64($y)->addInt64($z);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Int64 $x
+     * @param ParagonIE_Sodium_Core32_Int64 $y
+     * @return ParagonIE_Sodium_Core32_Int64
+     * @throws TypeError
+     */
+    public static function xor64(ParagonIE_Sodium_Core32_Int64 $x, ParagonIE_Sodium_Core32_Int64 $y)
+    {
+        return $x->xorInt64($y);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Int64 $x
+     * @param int $c
+     * @return ParagonIE_Sodium_Core32_Int64
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function rotr64(ParagonIE_Sodium_Core32_Int64 $x, $c)
+    {
+        return $x->rotateRight($c);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param SplFixedArray $x
+     * @param int $i
+     * @return ParagonIE_Sodium_Core32_Int64
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function load64($x, $i)
+    {
+        /** @var int $l */
+        $l = (int) ($x[$i])
+             | ((int) ($x[$i+1]) << 8)
+             | ((int) ($x[$i+2]) << 16)
+             | ((int) ($x[$i+3]) << 24);
+        /** @var int $h */
+        $h = (int) ($x[$i+4])
+             | ((int) ($x[$i+5]) << 8)
+             | ((int) ($x[$i+6]) << 16)
+             | ((int) ($x[$i+7]) << 24);
+        return self::new64($h, $l);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param SplFixedArray $x
+     * @param int $i
+     * @param ParagonIE_Sodium_Core32_Int64 $u
+     * @return void
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     * @psalm-suppress MixedAssignment
+     * @psalm-suppress MixedArrayAccess
+     * @psalm-suppress MixedArrayAssignment
+     * @psalm-suppress MixedArrayOffset
+     */
+    public static function store64(SplFixedArray $x, $i, ParagonIE_Sodium_Core32_Int64 $u)
+    {
+        $v = clone $u;
+        $maxLength = $x->getSize() - 1;
+        for ($j = 0; $j < 8; ++$j) {
+            $k = 3 - ($j >> 1);
+            $x[$i] = $v->limbs[$k] & 0xff;
+            if (++$i > $maxLength) {
+                return;
+            }
+            $v->limbs[$k] >>= 8;
+        }
+    }
+
+    /**
+     * This just sets the $iv static variable.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @return void
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function pseudoConstructor()
+    {
+        static $called = false;
+        if ($called) {
+            return;
+        }
+        self::$iv = new SplFixedArray(8);
+        self::$iv[0] = self::new64(0x6a09e667, 0xf3bcc908);
+        self::$iv[1] = self::new64(0xbb67ae85, 0x84caa73b);
+        self::$iv[2] = self::new64(0x3c6ef372, 0xfe94f82b);
+        self::$iv[3] = self::new64(0xa54ff53a, 0x5f1d36f1);
+        self::$iv[4] = self::new64(0x510e527f, 0xade682d1);
+        self::$iv[5] = self::new64(0x9b05688c, 0x2b3e6c1f);
+        self::$iv[6] = self::new64(0x1f83d9ab, 0xfb41bd6b);
+        self::$iv[7] = self::new64(0x5be0cd19, 0x137e2179);
+
+        $called = true;
+    }
+
+    /**
+     * Returns a fresh BLAKE2 context.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @return SplFixedArray
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     * @psalm-suppress MixedAssignment
+     * @psalm-suppress MixedArrayAccess
+     * @psalm-suppress MixedArrayAssignment
+     * @psalm-suppress MixedArrayOffset
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    protected static function context()
+    {
+        $ctx    = new SplFixedArray(6);
+        $ctx[0] = new SplFixedArray(8);   // h
+        $ctx[1] = new SplFixedArray(2);   // t
+        $ctx[2] = new SplFixedArray(2);   // f
+        $ctx[3] = new SplFixedArray(256); // buf
+        $ctx[4] = 0;                      // buflen
+        $ctx[5] = 0;                      // last_node (uint8_t)
+
+        for ($i = 8; $i--;) {
+            $ctx[0][$i] = self::$iv[$i];
+        }
+        for ($i = 256; $i--;) {
+            $ctx[3][$i] = 0;
+        }
+
+        $zero = self::new64(0, 0);
+        $ctx[1][0] = $zero;
+        $ctx[1][1] = $zero;
+        $ctx[2][0] = $zero;
+        $ctx[2][1] = $zero;
+
+        return $ctx;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param SplFixedArray $ctx
+     * @param SplFixedArray $buf
+     * @return void
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     * @psalm-suppress MixedArrayAccess
+     * @psalm-suppress MixedArrayAssignment
+     * @psalm-suppress MixedAssignment
+     */
+    protected static function compress(SplFixedArray $ctx, SplFixedArray $buf)
+    {
+        $m = new SplFixedArray(16);
+        $v = new SplFixedArray(16);
+
+        for ($i = 16; $i--;) {
+            $m[$i] = self::load64($buf, $i << 3);
+        }
+
+        for ($i = 8; $i--;) {
+            $v[$i] = $ctx[0][$i];
+        }
+
+        $v[ 8] = self::$iv[0];
+        $v[ 9] = self::$iv[1];
+        $v[10] = self::$iv[2];
+        $v[11] = self::$iv[3];
+
+        $v[12] = self::xor64($ctx[1][0], self::$iv[4]);
+        $v[13] = self::xor64($ctx[1][1], self::$iv[5]);
+        $v[14] = self::xor64($ctx[2][0], self::$iv[6]);
+        $v[15] = self::xor64($ctx[2][1], self::$iv[7]);
+
+        for ($r = 0; $r < 12; ++$r) {
+            $v = self::G($r, 0, 0, 4, 8, 12, $v, $m);
+            $v = self::G($r, 1, 1, 5, 9, 13, $v, $m);
+            $v = self::G($r, 2, 2, 6, 10, 14, $v, $m);
+            $v = self::G($r, 3, 3, 7, 11, 15, $v, $m);
+            $v = self::G($r, 4, 0, 5, 10, 15, $v, $m);
+            $v = self::G($r, 5, 1, 6, 11, 12, $v, $m);
+            $v = self::G($r, 6, 2, 7, 8, 13, $v, $m);
+            $v = self::G($r, 7, 3, 4, 9, 14, $v, $m);
+        }
+
+        for ($i = 8; $i--;) {
+            $ctx[0][$i] = self::xor64(
+                $ctx[0][$i], self::xor64($v[$i], $v[$i+8])
+            );
+        }
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param int $r
+     * @param int $i
+     * @param int $a
+     * @param int $b
+     * @param int $c
+     * @param int $d
+     * @param SplFixedArray $v
+     * @param SplFixedArray $m
+     * @return SplFixedArray
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     * @psalm-suppress MixedArrayOffset
+     */
+    public static function G($r, $i, $a, $b, $c, $d, SplFixedArray $v, SplFixedArray $m)
+    {
+        $v[$a] = self::add364($v[$a], $v[$b], $m[self::$sigma[$r][$i << 1]]);
+        $v[$d] = self::rotr64(self::xor64($v[$d], $v[$a]), 32);
+        $v[$c] = self::add64($v[$c], $v[$d]);
+        $v[$b] = self::rotr64(self::xor64($v[$b], $v[$c]), 24);
+        $v[$a] = self::add364($v[$a], $v[$b], $m[self::$sigma[$r][($i << 1) + 1]]);
+        $v[$d] = self::rotr64(self::xor64($v[$d], $v[$a]), 16);
+        $v[$c] = self::add64($v[$c], $v[$d]);
+        $v[$b] = self::rotr64(self::xor64($v[$b], $v[$c]), 63);
+        return $v;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param SplFixedArray $ctx
+     * @param int $inc
+     * @return void
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     * @psalm-suppress MixedArrayAccess
+     * @psalm-suppress MixedArrayAssignment
+     */
+    public static function increment_counter($ctx, $inc)
+    {
+        if ($inc < 0) {
+            throw new SodiumException('Increasing by a negative number makes no sense.');
+        }
+        $t = self::to64($inc);
+        # S->t is $ctx[1] in our implementation
+
+        # S->t[0] = ( uint64_t )( t >> 0 );
+        $ctx[1][0] = self::add64($ctx[1][0], $t);
+
+        # S->t[1] += ( S->t[0] < inc );
+        if (!($ctx[1][0] instanceof ParagonIE_Sodium_Core32_Int64)) {
+            throw new TypeError('Not an int64');
+        }
+        /** @var ParagonIE_Sodium_Core32_Int64 $c*/
+        $c = $ctx[1][0];
+        if ($c->isLessThanInt($inc)) {
+            $ctx[1][1] = self::add64($ctx[1][1], self::to64(1));
+        }
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param SplFixedArray $ctx
+     * @param SplFixedArray $p
+     * @param int $plen
+     * @return void
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     * @psalm-suppress MixedAssignment
+     * @psalm-suppress MixedArrayAccess
+     * @psalm-suppress MixedArrayAssignment
+     * @psalm-suppress MixedArrayOffset
+     * @psalm-suppress MixedMethodCall
+     * @psalm-suppress MixedOperand
+     */
+    public static function update(SplFixedArray $ctx, SplFixedArray $p, $plen)
+    {
+        self::pseudoConstructor();
+
+        $offset = 0;
+        while ($plen > 0) {
+            $left = $ctx[4];
+            $fill = 256 - $left;
+
+            if ($plen > $fill) {
+                # memcpy( S->buf + left, in, fill ); /* Fill buffer */
+                for ($i = $fill; $i--;) {
+                    $ctx[3][$i + $left] = $p[$i + $offset];
+                }
+
+                # S->buflen += fill;
+                $ctx[4] += $fill;
+
+                # blake2b_increment_counter( S, BLAKE2B_BLOCKBYTES );
+                self::increment_counter($ctx, 128);
+
+                # blake2b_compress( S, S->buf ); /* Compress */
+                self::compress($ctx, $ctx[3]);
+
+                # memcpy( S->buf, S->buf + BLAKE2B_BLOCKBYTES, BLAKE2B_BLOCKBYTES ); /* Shift buffer left */
+                for ($i = 128; $i--;) {
+                    $ctx[3][$i] = $ctx[3][$i + 128];
+                }
+
+                # S->buflen -= BLAKE2B_BLOCKBYTES;
+                $ctx[4] -= 128;
+
+                # in += fill;
+                $offset += $fill;
+
+                # inlen -= fill;
+                $plen -= $fill;
+            } else {
+                for ($i = $plen; $i--;) {
+                    $ctx[3][$i + $left] = $p[$i + $offset];
+                }
+                $ctx[4] += $plen;
+                $offset += $plen;
+                $plen -= $plen;
+            }
+        }
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param SplFixedArray $ctx
+     * @param SplFixedArray $out
+     * @return SplFixedArray
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     * @psalm-suppress MixedAssignment
+     * @psalm-suppress MixedArrayAccess
+     * @psalm-suppress MixedArrayAssignment
+     * @psalm-suppress MixedArrayOffset
+     * @psalm-suppress MixedMethodCall
+     * @psalm-suppress MixedOperand
+     */
+    public static function finish(SplFixedArray $ctx, SplFixedArray $out)
+    {
+        self::pseudoConstructor();
+        if ($ctx[4] > 128) {
+            self::increment_counter($ctx, 128);
+            self::compress($ctx, $ctx[3]);
+            $ctx[4] -= 128;
+            if ($ctx[4] > 128) {
+                throw new SodiumException('Failed to assert that buflen <= 128 bytes');
+            }
+            for ($i = $ctx[4]; $i--;) {
+                $ctx[3][$i] = $ctx[3][$i + 128];
+            }
+        }
+
+        self::increment_counter($ctx, $ctx[4]);
+        $ctx[2][0] = self::new64(0xffffffff, 0xffffffff);
+
+        for ($i = 256 - $ctx[4]; $i--;) {
+            /** @var int $i */
+            $ctx[3][$i + $ctx[4]] = 0;
+        }
+
+        self::compress($ctx, $ctx[3]);
+
+        $i = (int) (($out->getSize() - 1) / 8);
+        for (; $i >= 0; --$i) {
+            self::store64($out, $i << 3, $ctx[0][$i]);
+        }
+        return $out;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param SplFixedArray|null $key
+     * @param int $outlen
+     * @param SplFixedArray|null $salt
+     * @param SplFixedArray|null $personal
+     * @return SplFixedArray
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     * @psalm-suppress MixedAssignment
+     * @psalm-suppress MixedArrayAccess
+     * @psalm-suppress MixedArrayAssignment
+     * @psalm-suppress MixedMethodCall
+     */
+    public static function init(
+        $key = null,
+        $outlen = 64,
+        $salt = null,
+        $personal = null
+    ) {
+        self::pseudoConstructor();
+        $klen = 0;
+
+        if ($key !== null) {
+            if (count($key) > 64) {
+                throw new SodiumException('Invalid key size');
+            }
+            $klen = count($key);
+        }
+
+        if ($outlen > 64) {
+            throw new SodiumException('Invalid output size');
+        }
+
+        $ctx = self::context();
+
+        $p = new SplFixedArray(64);
+        // Zero our param buffer...
+        for ($i = 64; --$i;) {
+            $p[$i] = 0;
+        }
+
+        $p[0] = $outlen; // digest_length
+        $p[1] = $klen;   // key_length
+        $p[2] = 1;       // fanout
+        $p[3] = 1;       // depth
+
+        if ($salt instanceof SplFixedArray) {
+            // salt: [32] through [47]
+            for ($i = 0; $i < 16; ++$i) {
+                $p[32 + $i] = (int) $salt[$i];
+            }
+        }
+        if ($personal instanceof SplFixedArray) {
+            // personal: [48] through [63]
+            for ($i = 0; $i < 16; ++$i) {
+                $p[48 + $i] = (int) $personal[$i];
+            }
+        }
+
+        $ctx[0][0] = self::xor64(
+            $ctx[0][0],
+            self::load64($p, 0)
+        );
+
+        if ($salt instanceof SplFixedArray || $personal instanceof SplFixedArray) {
+            // We need to do what blake2b_init_param() does:
+            for ($i = 1; $i < 8; ++$i) {
+                $ctx[0][$i] = self::xor64(
+                    $ctx[0][$i],
+                    self::load64($p, $i << 3)
+                );
+            }
+        }
+
+        if ($klen > 0 && $key instanceof SplFixedArray) {
+            $block = new SplFixedArray(128);
+            for ($i = 128; $i--;) {
+                $block[$i] = 0;
+            }
+            for ($i = $klen; $i--;) {
+                $block[$i] = $key[$i];
+            }
+            self::update($ctx, $block, 128);
+            $ctx[4] = 128;
+        }
+
+        return $ctx;
+    }
+
+    /**
+     * Convert a string into an SplFixedArray of integers
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $str
+     * @return SplFixedArray
+     * @psalm-suppress MixedArgumentTypeCoercion
+     */
+    public static function stringToSplFixedArray($str = '')
+    {
+        $values = unpack('C*', $str);
+        return SplFixedArray::fromArray(array_values($values));
+    }
+
+    /**
+     * Convert an SplFixedArray of integers into a string
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param SplFixedArray $a
+     * @return string
+     */
+    public static function SplFixedArrayToString(SplFixedArray $a)
+    {
+        /**
+         * @var array<int, string|int>
+         */
+        $arr = $a->toArray();
+        $c = $a->count();
+        array_unshift($arr, str_repeat('C', $c));
+        return (string) (call_user_func_array('pack', $arr));
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param SplFixedArray $ctx
+     * @return string
+     * @throws TypeError
+     * @psalm-suppress MixedArgument
+     * @psalm-suppress MixedArrayAccess
+     * @psalm-suppress MixedArrayAssignment
+     * @psalm-suppress MixedMethodCall
+     */
+    public static function contextToString(SplFixedArray $ctx)
+    {
+        $str = '';
+        /** @var array<int, ParagonIE_Sodium_Core32_Int64> $ctxA */
+        $ctxA = $ctx[0]->toArray();
+
+        # uint64_t h[8];
+        for ($i = 0; $i < 8; ++$i) {
+            if (!($ctxA[$i] instanceof ParagonIE_Sodium_Core32_Int64)) {
+                throw new TypeError('Not an instance of Int64');
+            }
+            /** @var ParagonIE_Sodium_Core32_Int64 $ctxAi */
+            $ctxAi = $ctxA[$i];
+            $str .= $ctxAi->toReverseString();
+        }
+
+        # uint64_t t[2];
+        # uint64_t f[2];
+        for ($i = 1; $i < 3; ++$i) {
+            /** @var array<int, ParagonIE_Sodium_Core32_Int64> $ctxA */
+            $ctxA = $ctx[$i]->toArray();
+            /** @var ParagonIE_Sodium_Core32_Int64 $ctxA1 */
+            $ctxA1 = $ctxA[0];
+            /** @var ParagonIE_Sodium_Core32_Int64 $ctxA2 */
+            $ctxA2 = $ctxA[1];
+
+            $str .= $ctxA1->toReverseString();
+            $str .= $ctxA2->toReverseString();
+        }
+
+        # uint8_t buf[2 * 128];
+        $str .= self::SplFixedArrayToString($ctx[3]);
+
+        /** @var int $ctx4 */
+        $ctx4 = $ctx[4];
+
+        # size_t buflen;
+        $str .= implode('', array(
+            self::intToChr($ctx4 & 0xff),
+            self::intToChr(($ctx4 >> 8) & 0xff),
+            self::intToChr(($ctx4 >> 16) & 0xff),
+            self::intToChr(($ctx4 >> 24) & 0xff),
+            "\x00\x00\x00\x00"
+            /*
+            self::intToChr(($ctx4 >> 32) & 0xff),
+            self::intToChr(($ctx4 >> 40) & 0xff),
+            self::intToChr(($ctx4 >> 48) & 0xff),
+            self::intToChr(($ctx4 >> 56) & 0xff)
+            */
+        ));
+        # uint8_t last_node;
+        return $str . self::intToChr($ctx[5]) . str_repeat("\x00", 23);
+    }
+
+    /**
+     * Creates an SplFixedArray containing other SplFixedArray elements, from
+     * a string (compatible with \Sodium\crypto_generichash_{init, update, final})
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $string
+     * @return SplFixedArray
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArrayAccess
+     * @psalm-suppress MixedArrayAssignment
+     */
+    public static function stringToContext($string)
+    {
+        $ctx = self::context();
+
+        # uint64_t h[8];
+        for ($i = 0; $i < 8; ++$i) {
+            $ctx[0][$i] = ParagonIE_Sodium_Core32_Int64::fromReverseString(
+                self::substr($string, (($i << 3) + 0), 8)
+            );
+        }
+
+        # uint64_t t[2];
+        # uint64_t f[2];
+        for ($i = 1; $i < 3; ++$i) {
+            $ctx[$i][1] = ParagonIE_Sodium_Core32_Int64::fromReverseString(
+                self::substr($string, 72 + (($i - 1) << 4), 8)
+            );
+            $ctx[$i][0] = ParagonIE_Sodium_Core32_Int64::fromReverseString(
+                self::substr($string, 64 + (($i - 1) << 4), 8)
+            );
+        }
+
+        # uint8_t buf[2 * 128];
+        $ctx[3] = self::stringToSplFixedArray(self::substr($string, 96, 256));
+
+        # uint8_t buf[2 * 128];
+        $int = 0;
+        for ($i = 0; $i < 8; ++$i) {
+            $int |= self::chrToInt($string[352 + $i]) << ($i << 3);
+        }
+        $ctx[4] = $int;
+
+        return $ctx;
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core32/ChaCha20.php b/vendor/paragonie/sodium_compat/src/Core32/ChaCha20.php
new file mode 100644
index 0000000..6f8c0bf
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core32/ChaCha20.php
@@ -0,0 +1,400 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core32_ChaCha20', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core32_ChaCha20
+ */
+class ParagonIE_Sodium_Core32_ChaCha20 extends ParagonIE_Sodium_Core32_Util
+{
+    /**
+     * The ChaCha20 quarter round function. Works on four 32-bit integers.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Int32 $a
+     * @param ParagonIE_Sodium_Core32_Int32 $b
+     * @param ParagonIE_Sodium_Core32_Int32 $c
+     * @param ParagonIE_Sodium_Core32_Int32 $d
+     * @return array<int, ParagonIE_Sodium_Core32_Int32>
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    protected static function quarterRound(
+        ParagonIE_Sodium_Core32_Int32 $a,
+        ParagonIE_Sodium_Core32_Int32 $b,
+        ParagonIE_Sodium_Core32_Int32 $c,
+        ParagonIE_Sodium_Core32_Int32 $d
+    ) {
+        /** @var ParagonIE_Sodium_Core32_Int32 $a */
+        /** @var ParagonIE_Sodium_Core32_Int32 $b */
+        /** @var ParagonIE_Sodium_Core32_Int32 $c */
+        /** @var ParagonIE_Sodium_Core32_Int32 $d */
+
+        # a = PLUS(a,b); d = ROTATE(XOR(d,a),16);
+        $a = $a->addInt32($b);
+        $d = $d->xorInt32($a)->rotateLeft(16);
+
+        # c = PLUS(c,d); b = ROTATE(XOR(b,c),12);
+        $c = $c->addInt32($d);
+        $b = $b->xorInt32($c)->rotateLeft(12);
+
+        # a = PLUS(a,b); d = ROTATE(XOR(d,a), 8);
+        $a = $a->addInt32($b);
+        $d = $d->xorInt32($a)->rotateLeft(8);
+
+        # c = PLUS(c,d); b = ROTATE(XOR(b,c), 7);
+        $c = $c->addInt32($d);
+        $b = $b->xorInt32($c)->rotateLeft(7);
+
+        return array($a, $b, $c, $d);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_ChaCha20_Ctx $ctx
+     * @param string $message
+     *
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function encryptBytes(
+        ParagonIE_Sodium_Core32_ChaCha20_Ctx $ctx,
+        $message = ''
+    ) {
+        $bytes = self::strlen($message);
+
+        /** @var ParagonIE_Sodium_Core32_Int32 $x0 */
+        /** @var ParagonIE_Sodium_Core32_Int32 $x1 */
+        /** @var ParagonIE_Sodium_Core32_Int32 $x2 */
+        /** @var ParagonIE_Sodium_Core32_Int32 $x3 */
+        /** @var ParagonIE_Sodium_Core32_Int32 $x4 */
+        /** @var ParagonIE_Sodium_Core32_Int32 $x5 */
+        /** @var ParagonIE_Sodium_Core32_Int32 $x6 */
+        /** @var ParagonIE_Sodium_Core32_Int32 $x7 */
+        /** @var ParagonIE_Sodium_Core32_Int32 $x8 */
+        /** @var ParagonIE_Sodium_Core32_Int32 $x9 */
+        /** @var ParagonIE_Sodium_Core32_Int32 $x10 */
+        /** @var ParagonIE_Sodium_Core32_Int32 $x11 */
+        /** @var ParagonIE_Sodium_Core32_Int32 $x12 */
+        /** @var ParagonIE_Sodium_Core32_Int32 $x13 */
+        /** @var ParagonIE_Sodium_Core32_Int32 $x14 */
+        /** @var ParagonIE_Sodium_Core32_Int32 $x15 */
+
+        /*
+        j0 = ctx->input[0];
+        j1 = ctx->input[1];
+        j2 = ctx->input[2];
+        j3 = ctx->input[3];
+        j4 = ctx->input[4];
+        j5 = ctx->input[5];
+        j6 = ctx->input[6];
+        j7 = ctx->input[7];
+        j8 = ctx->input[8];
+        j9 = ctx->input[9];
+        j10 = ctx->input[10];
+        j11 = ctx->input[11];
+        j12 = ctx->input[12];
+        j13 = ctx->input[13];
+        j14 = ctx->input[14];
+        j15 = ctx->input[15];
+        */
+        /** @var ParagonIE_Sodium_Core32_Int32 $j0 */
+        $j0  = $ctx[0];
+        /** @var ParagonIE_Sodium_Core32_Int32 $j1 */
+        $j1  = $ctx[1];
+        /** @var ParagonIE_Sodium_Core32_Int32 $j2 */
+        $j2  = $ctx[2];
+        /** @var ParagonIE_Sodium_Core32_Int32 $j3 */
+        $j3  = $ctx[3];
+        /** @var ParagonIE_Sodium_Core32_Int32 $j4 */
+        $j4  = $ctx[4];
+        /** @var ParagonIE_Sodium_Core32_Int32 $j5 */
+        $j5  = $ctx[5];
+        /** @var ParagonIE_Sodium_Core32_Int32 $j6 */
+        $j6  = $ctx[6];
+        /** @var ParagonIE_Sodium_Core32_Int32 $j7 */
+        $j7  = $ctx[7];
+        /** @var ParagonIE_Sodium_Core32_Int32 $j8 */
+        $j8  = $ctx[8];
+        /** @var ParagonIE_Sodium_Core32_Int32 $j9 */
+        $j9  = $ctx[9];
+        /** @var ParagonIE_Sodium_Core32_Int32 $j10 */
+        $j10 = $ctx[10];
+        /** @var ParagonIE_Sodium_Core32_Int32 $j11 */
+        $j11 = $ctx[11];
+        /** @var ParagonIE_Sodium_Core32_Int32 $j12 */
+        $j12 = $ctx[12];
+        /** @var ParagonIE_Sodium_Core32_Int32 $j13 */
+        $j13 = $ctx[13];
+        /** @var ParagonIE_Sodium_Core32_Int32 $j14 */
+        $j14 = $ctx[14];
+        /** @var ParagonIE_Sodium_Core32_Int32 $j15 */
+        $j15 = $ctx[15];
+
+        $c = '';
+        for (;;) {
+            if ($bytes < 64) {
+                $message .= str_repeat("\x00", 64 - $bytes);
+            }
+
+            $x0 =  clone $j0;
+            $x1 =  clone $j1;
+            $x2 =  clone $j2;
+            $x3 =  clone $j3;
+            $x4 =  clone $j4;
+            $x5 =  clone $j5;
+            $x6 =  clone $j6;
+            $x7 =  clone $j7;
+            $x8 =  clone $j8;
+            $x9 =  clone $j9;
+            $x10 = clone $j10;
+            $x11 = clone $j11;
+            $x12 = clone $j12;
+            $x13 = clone $j13;
+            $x14 = clone $j14;
+            $x15 = clone $j15;
+
+            # for (i = 20; i > 0; i -= 2) {
+            for ($i = 20; $i > 0; $i -= 2) {
+                # QUARTERROUND( x0,  x4,  x8,  x12)
+                list($x0, $x4, $x8, $x12) = self::quarterRound($x0, $x4, $x8, $x12);
+
+                # QUARTERROUND( x1,  x5,  x9,  x13)
+                list($x1, $x5, $x9, $x13) = self::quarterRound($x1, $x5, $x9, $x13);
+
+                # QUARTERROUND( x2,  x6,  x10,  x14)
+                list($x2, $x6, $x10, $x14) = self::quarterRound($x2, $x6, $x10, $x14);
+
+                # QUARTERROUND( x3,  x7,  x11,  x15)
+                list($x3, $x7, $x11, $x15) = self::quarterRound($x3, $x7, $x11, $x15);
+
+                # QUARTERROUND( x0,  x5,  x10,  x15)
+                list($x0, $x5, $x10, $x15) = self::quarterRound($x0, $x5, $x10, $x15);
+
+                # QUARTERROUND( x1,  x6,  x11,  x12)
+                list($x1, $x6, $x11, $x12) = self::quarterRound($x1, $x6, $x11, $x12);
+
+                # QUARTERROUND( x2,  x7,  x8,  x13)
+                list($x2, $x7, $x8, $x13) = self::quarterRound($x2, $x7, $x8, $x13);
+
+                # QUARTERROUND( x3,  x4,  x9,  x14)
+                list($x3, $x4, $x9, $x14) = self::quarterRound($x3, $x4, $x9, $x14);
+            }
+            /*
+            x0 = PLUS(x0, j0);
+            x1 = PLUS(x1, j1);
+            x2 = PLUS(x2, j2);
+            x3 = PLUS(x3, j3);
+            x4 = PLUS(x4, j4);
+            x5 = PLUS(x5, j5);
+            x6 = PLUS(x6, j6);
+            x7 = PLUS(x7, j7);
+            x8 = PLUS(x8, j8);
+            x9 = PLUS(x9, j9);
+            x10 = PLUS(x10, j10);
+            x11 = PLUS(x11, j11);
+            x12 = PLUS(x12, j12);
+            x13 = PLUS(x13, j13);
+            x14 = PLUS(x14, j14);
+            x15 = PLUS(x15, j15);
+            */
+            $x0 = $x0->addInt32($j0);
+            $x1 = $x1->addInt32($j1);
+            $x2 = $x2->addInt32($j2);
+            $x3 = $x3->addInt32($j3);
+            $x4 = $x4->addInt32($j4);
+            $x5 = $x5->addInt32($j5);
+            $x6 = $x6->addInt32($j6);
+            $x7 = $x7->addInt32($j7);
+            $x8 = $x8->addInt32($j8);
+            $x9 = $x9->addInt32($j9);
+            $x10 = $x10->addInt32($j10);
+            $x11 = $x11->addInt32($j11);
+            $x12 = $x12->addInt32($j12);
+            $x13 = $x13->addInt32($j13);
+            $x14 = $x14->addInt32($j14);
+            $x15 = $x15->addInt32($j15);
+
+            /*
+            x0 = XOR(x0, LOAD32_LE(m + 0));
+            x1 = XOR(x1, LOAD32_LE(m + 4));
+            x2 = XOR(x2, LOAD32_LE(m + 8));
+            x3 = XOR(x3, LOAD32_LE(m + 12));
+            x4 = XOR(x4, LOAD32_LE(m + 16));
+            x5 = XOR(x5, LOAD32_LE(m + 20));
+            x6 = XOR(x6, LOAD32_LE(m + 24));
+            x7 = XOR(x7, LOAD32_LE(m + 28));
+            x8 = XOR(x8, LOAD32_LE(m + 32));
+            x9 = XOR(x9, LOAD32_LE(m + 36));
+            x10 = XOR(x10, LOAD32_LE(m + 40));
+            x11 = XOR(x11, LOAD32_LE(m + 44));
+            x12 = XOR(x12, LOAD32_LE(m + 48));
+            x13 = XOR(x13, LOAD32_LE(m + 52));
+            x14 = XOR(x14, LOAD32_LE(m + 56));
+            x15 = XOR(x15, LOAD32_LE(m + 60));
+            */
+            $x0  =  $x0->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message,  0, 4)));
+            $x1  =  $x1->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message,  4, 4)));
+            $x2  =  $x2->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message,  8, 4)));
+            $x3  =  $x3->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 12, 4)));
+            $x4  =  $x4->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 16, 4)));
+            $x5  =  $x5->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 20, 4)));
+            $x6  =  $x6->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 24, 4)));
+            $x7  =  $x7->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 28, 4)));
+            $x8  =  $x8->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 32, 4)));
+            $x9  =  $x9->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 36, 4)));
+            $x10 = $x10->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 40, 4)));
+            $x11 = $x11->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 44, 4)));
+            $x12 = $x12->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 48, 4)));
+            $x13 = $x13->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 52, 4)));
+            $x14 = $x14->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 56, 4)));
+            $x15 = $x15->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 60, 4)));
+
+            /*
+                j12 = PLUSONE(j12);
+                if (!j12) {
+                    j13 = PLUSONE(j13);
+                }
+             */
+            /** @var ParagonIE_Sodium_Core32_Int32 $j12 */
+            $j12 = $j12->addInt(1);
+            if ($j12->limbs[0] === 0 && $j12->limbs[1] === 0) {
+                $j13 = $j13->addInt(1);
+            }
+
+            /*
+            STORE32_LE(c + 0, x0);
+            STORE32_LE(c + 4, x1);
+            STORE32_LE(c + 8, x2);
+            STORE32_LE(c + 12, x3);
+            STORE32_LE(c + 16, x4);
+            STORE32_LE(c + 20, x5);
+            STORE32_LE(c + 24, x6);
+            STORE32_LE(c + 28, x7);
+            STORE32_LE(c + 32, x8);
+            STORE32_LE(c + 36, x9);
+            STORE32_LE(c + 40, x10);
+            STORE32_LE(c + 44, x11);
+            STORE32_LE(c + 48, x12);
+            STORE32_LE(c + 52, x13);
+            STORE32_LE(c + 56, x14);
+            STORE32_LE(c + 60, x15);
+            */
+
+            $block = $x0->toReverseString() .
+                $x1->toReverseString() .
+                $x2->toReverseString() .
+                $x3->toReverseString() .
+                $x4->toReverseString() .
+                $x5->toReverseString() .
+                $x6->toReverseString() .
+                $x7->toReverseString() .
+                $x8->toReverseString() .
+                $x9->toReverseString() .
+                $x10->toReverseString() .
+                $x11->toReverseString() .
+                $x12->toReverseString() .
+                $x13->toReverseString() .
+                $x14->toReverseString() .
+                $x15->toReverseString();
+
+            /* Partial block */
+            if ($bytes < 64) {
+                $c .= self::substr($block, 0, $bytes);
+                break;
+            }
+
+            /* Full block */
+            $c .= $block;
+            $bytes -= 64;
+            if ($bytes <= 0) {
+                break;
+            }
+            $message = self::substr($message, 64);
+        }
+        /* end for(;;) loop */
+
+        $ctx[12] = $j12;
+        $ctx[13] = $j13;
+        return $c;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param int $len
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function stream($len = 64, $nonce = '', $key = '')
+    {
+        return self::encryptBytes(
+            new ParagonIE_Sodium_Core32_ChaCha20_Ctx($key, $nonce),
+            str_repeat("\x00", $len)
+        );
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param int $len
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function ietfStream($len, $nonce = '', $key = '')
+    {
+        return self::encryptBytes(
+            new ParagonIE_Sodium_Core32_ChaCha20_IetfCtx($key, $nonce),
+            str_repeat("\x00", $len)
+        );
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $message
+     * @param string $nonce
+     * @param string $key
+     * @param string $ic
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function ietfStreamXorIc($message, $nonce = '', $key = '', $ic = '')
+    {
+        return self::encryptBytes(
+            new ParagonIE_Sodium_Core32_ChaCha20_IetfCtx($key, $nonce, $ic),
+            $message
+        );
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $message
+     * @param string $nonce
+     * @param string $key
+     * @param string $ic
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function streamXorIc($message, $nonce = '', $key = '', $ic = '')
+    {
+        return self::encryptBytes(
+            new ParagonIE_Sodium_Core32_ChaCha20_Ctx($key, $nonce, $ic),
+            $message
+        );
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core32/ChaCha20/Ctx.php b/vendor/paragonie/sodium_compat/src/Core32/ChaCha20/Ctx.php
new file mode 100644
index 0000000..3f47d03
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core32/ChaCha20/Ctx.php
@@ -0,0 +1,126 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core_ChaCha20_Ctx', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core32_ChaCha20_Ctx
+ */
+class ParagonIE_Sodium_Core32_ChaCha20_Ctx extends ParagonIE_Sodium_Core32_Util implements ArrayAccess
+{
+    /**
+     * @var SplFixedArray internally, <int, ParagonIE_Sodium_Core32_Int32>
+     */
+    protected $container;
+
+    /**
+     * ParagonIE_Sodium_Core_ChaCha20_Ctx constructor.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $key     ChaCha20 key.
+     * @param string $iv      Initialization Vector (a.k.a. nonce).
+     * @param string $counter The initial counter value.
+     *                        Defaults to 8 0x00 bytes.
+     * @throws InvalidArgumentException
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public function __construct($key = '', $iv = '', $counter = '')
+    {
+        if (self::strlen($key) !== 32) {
+            throw new InvalidArgumentException('ChaCha20 expects a 256-bit key.');
+        }
+        if (self::strlen($iv) !== 8) {
+            throw new InvalidArgumentException('ChaCha20 expects a 64-bit nonce.');
+        }
+        $this->container = new SplFixedArray(16);
+
+        /* "expand 32-byte k" as per ChaCha20 spec */
+        $this->container[0]  = new ParagonIE_Sodium_Core32_Int32(array(0x6170, 0x7865));
+        $this->container[1]  = new ParagonIE_Sodium_Core32_Int32(array(0x3320, 0x646e));
+        $this->container[2]  = new ParagonIE_Sodium_Core32_Int32(array(0x7962, 0x2d32));
+        $this->container[3]  = new ParagonIE_Sodium_Core32_Int32(array(0x6b20, 0x6574));
+
+        $this->container[4]  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 0, 4));
+        $this->container[5]  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 4, 4));
+        $this->container[6]  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 8, 4));
+        $this->container[7]  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 12, 4));
+        $this->container[8]  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 16, 4));
+        $this->container[9]  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 20, 4));
+        $this->container[10] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 24, 4));
+        $this->container[11] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 28, 4));
+
+        if (empty($counter)) {
+            $this->container[12] = new ParagonIE_Sodium_Core32_Int32();
+            $this->container[13] = new ParagonIE_Sodium_Core32_Int32();
+        } else {
+            $this->container[12] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($counter, 0, 4));
+            $this->container[13] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($counter, 4, 4));
+        }
+        $this->container[14] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($iv, 0, 4));
+        $this->container[15] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($iv, 4, 4));
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param int $offset
+     * @param int|ParagonIE_Sodium_Core32_Int32 $value
+     * @return void
+     */
+    public function offsetSet($offset, $value)
+    {
+        if (!is_int($offset)) {
+            throw new InvalidArgumentException('Expected an integer');
+        }
+        if ($value instanceof ParagonIE_Sodium_Core32_Int32) {
+            /*
+        } elseif (is_int($value)) {
+            $value = ParagonIE_Sodium_Core32_Int32::fromInt($value);
+            */
+        } else {
+            throw new InvalidArgumentException('Expected an integer');
+        }
+        $this->container[$offset] = $value;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param int $offset
+     * @return bool
+     * @psalm-suppress MixedArrayOffset
+     */
+    public function offsetExists($offset)
+    {
+        return isset($this->container[$offset]);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param int $offset
+     * @return void
+     * @psalm-suppress MixedArrayOffset
+     */
+    public function offsetUnset($offset)
+    {
+        unset($this->container[$offset]);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param int $offset
+     * @return mixed|null
+     * @psalm-suppress MixedArrayOffset
+     */
+    public function offsetGet($offset)
+    {
+        return isset($this->container[$offset])
+            ? $this->container[$offset]
+            : null;
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core32/ChaCha20/IetfCtx.php b/vendor/paragonie/sodium_compat/src/Core32/ChaCha20/IetfCtx.php
new file mode 100644
index 0000000..eea08de
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core32/ChaCha20/IetfCtx.php
@@ -0,0 +1,39 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core_ChaCha20_IetfCtx', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core32_ChaCha20_IetfCtx
+ */
+class ParagonIE_Sodium_Core32_ChaCha20_IetfCtx extends ParagonIE_Sodium_Core32_ChaCha20_Ctx
+{
+    /**
+     * ParagonIE_Sodium_Core_ChaCha20_IetfCtx constructor.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $key     ChaCha20 key.
+     * @param string $iv      Initialization Vector (a.k.a. nonce).
+     * @param string $counter The initial counter value.
+     *                        Defaults to 4 0x00 bytes.
+     * @throws InvalidArgumentException
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public function __construct($key = '', $iv = '', $counter = '')
+    {
+        if (self::strlen($iv) !== 12) {
+            throw new InvalidArgumentException('ChaCha20 expects a 96-bit nonce in IETF mode.');
+        }
+        parent::__construct($key, self::substr($iv, 0, 8), $counter);
+
+        if (!empty($counter)) {
+            $this->container[12] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($counter, 0, 4));
+        }
+        $this->container[13] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($iv, 0, 4));
+        $this->container[14] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($iv, 4, 4));
+        $this->container[15] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($iv, 8, 4));
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core32/Curve25519.php b/vendor/paragonie/sodium_compat/src/Core32/Curve25519.php
new file mode 100644
index 0000000..d6d700e
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core32/Curve25519.php
@@ -0,0 +1,3196 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core32_Curve25519', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core32_Curve25519
+ *
+ * Implements Curve25519 core functions
+ *
+ * Based on the ref10 curve25519 code provided by libsodium
+ *
+ * @ref https://github.com/jedisct1/libsodium/blob/master/src/libsodium/crypto_core/curve25519/ref10/curve25519_ref10.c
+ */
+abstract class ParagonIE_Sodium_Core32_Curve25519 extends ParagonIE_Sodium_Core32_Curve25519_H
+{
+    /**
+     * Get a field element of size 10 with a value of 0
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @return ParagonIE_Sodium_Core32_Curve25519_Fe
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function fe_0()
+    {
+        return ParagonIE_Sodium_Core32_Curve25519_Fe::fromArray(
+            array(
+                new ParagonIE_Sodium_Core32_Int32(),
+                new ParagonIE_Sodium_Core32_Int32(),
+                new ParagonIE_Sodium_Core32_Int32(),
+                new ParagonIE_Sodium_Core32_Int32(),
+                new ParagonIE_Sodium_Core32_Int32(),
+                new ParagonIE_Sodium_Core32_Int32(),
+                new ParagonIE_Sodium_Core32_Int32(),
+                new ParagonIE_Sodium_Core32_Int32(),
+                new ParagonIE_Sodium_Core32_Int32(),
+                new ParagonIE_Sodium_Core32_Int32()
+            )
+        );
+    }
+
+    /**
+     * Get a field element of size 10 with a value of 1
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @return ParagonIE_Sodium_Core32_Curve25519_Fe
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function fe_1()
+    {
+        return ParagonIE_Sodium_Core32_Curve25519_Fe::fromArray(
+            array(
+                ParagonIE_Sodium_Core32_Int32::fromInt(1),
+                new ParagonIE_Sodium_Core32_Int32(),
+                new ParagonIE_Sodium_Core32_Int32(),
+                new ParagonIE_Sodium_Core32_Int32(),
+                new ParagonIE_Sodium_Core32_Int32(),
+                new ParagonIE_Sodium_Core32_Int32(),
+                new ParagonIE_Sodium_Core32_Int32(),
+                new ParagonIE_Sodium_Core32_Int32(),
+                new ParagonIE_Sodium_Core32_Int32(),
+                new ParagonIE_Sodium_Core32_Int32()
+            )
+        );
+    }
+
+    /**
+     * Add two field elements.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe $f
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe $g
+     * @return ParagonIE_Sodium_Core32_Curve25519_Fe
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedAssignment
+     * @psalm-suppress MixedMethodCall
+     */
+    public static function fe_add(
+        ParagonIE_Sodium_Core32_Curve25519_Fe $f,
+        ParagonIE_Sodium_Core32_Curve25519_Fe $g
+    ) {
+        $arr = array();
+        for ($i = 0; $i < 10; ++$i) {
+            $arr[$i] = $f[$i]->addInt32($g[$i]);
+        }
+        /** @var array<int, ParagonIE_Sodium_Core32_Int32> $arr */
+        return ParagonIE_Sodium_Core32_Curve25519_Fe::fromArray($arr);
+    }
+
+    /**
+     * Constant-time conditional move.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe $f
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe $g
+     * @param int $b
+     * @return ParagonIE_Sodium_Core32_Curve25519_Fe
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedAssignment
+     * @psalm-suppress MixedMethodCall
+     */
+    public static function fe_cmov(
+        ParagonIE_Sodium_Core32_Curve25519_Fe $f,
+        ParagonIE_Sodium_Core32_Curve25519_Fe $g,
+        $b = 0
+    ) {
+        /** @var array<int, ParagonIE_Sodium_Core32_Int32> $h */
+        $h = array();
+        for ($i = 0; $i < 10; ++$i) {
+            if (!($f[$i] instanceof ParagonIE_Sodium_Core32_Int32)) {
+                throw new TypeError('Expected Int32');
+            }
+            if (!($g[$i] instanceof ParagonIE_Sodium_Core32_Int32)) {
+                throw new TypeError('Expected Int32');
+            }
+            $h[$i] = $f[$i]->xorInt32(
+                $f[$i]->xorInt32($g[$i])->mask($b)
+            );
+        }
+        /** @var array<int, ParagonIE_Sodium_Core32_Int32> $h */
+        return ParagonIE_Sodium_Core32_Curve25519_Fe::fromArray($h);
+    }
+
+    /**
+     * Create a copy of a field element.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe $f
+     * @return ParagonIE_Sodium_Core32_Curve25519_Fe
+     */
+    public static function fe_copy(ParagonIE_Sodium_Core32_Curve25519_Fe $f)
+    {
+        $h = clone $f;
+        return $h;
+    }
+
+    /**
+     * Give: 32-byte string.
+     * Receive: A field element object to use for internal calculations.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $s
+     * @return ParagonIE_Sodium_Core32_Curve25519_Fe
+     * @throws RangeException
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedMethodCall
+     */
+    public static function fe_frombytes($s)
+    {
+        if (self::strlen($s) !== 32) {
+            throw new RangeException('Expected a 32-byte string.');
+        }
+        /** @var ParagonIE_Sodium_Core32_Int32 $h0 */
+        $h0 = ParagonIE_Sodium_Core32_Int32::fromInt(
+            self::load_4($s)
+        );
+        /** @var ParagonIE_Sodium_Core32_Int32 $h1 */
+        $h1 = ParagonIE_Sodium_Core32_Int32::fromInt(
+            self::load_3(self::substr($s, 4, 3)) << 6
+        );
+        /** @var ParagonIE_Sodium_Core32_Int32 $h2 */
+        $h2 = ParagonIE_Sodium_Core32_Int32::fromInt(
+            self::load_3(self::substr($s, 7, 3)) << 5
+        );
+        /** @var ParagonIE_Sodium_Core32_Int32 $h3 */
+        $h3 = ParagonIE_Sodium_Core32_Int32::fromInt(
+            self::load_3(self::substr($s, 10, 3)) << 3
+        );
+        /** @var ParagonIE_Sodium_Core32_Int32 $h4 */
+        $h4 = ParagonIE_Sodium_Core32_Int32::fromInt(
+            self::load_3(self::substr($s, 13, 3)) << 2
+        );
+        /** @var ParagonIE_Sodium_Core32_Int32 $h5 */
+        $h5 = ParagonIE_Sodium_Core32_Int32::fromInt(
+            self::load_4(self::substr($s, 16, 4))
+        );
+        /** @var ParagonIE_Sodium_Core32_Int32 $h6 */
+        $h6 = ParagonIE_Sodium_Core32_Int32::fromInt(
+            self::load_3(self::substr($s, 20, 3)) << 7
+        );
+        /** @var ParagonIE_Sodium_Core32_Int32 $h7 */
+        $h7 = ParagonIE_Sodium_Core32_Int32::fromInt(
+            self::load_3(self::substr($s, 23, 3)) << 5
+        );
+        /** @var ParagonIE_Sodium_Core32_Int32 $h8 */
+        $h8 = ParagonIE_Sodium_Core32_Int32::fromInt(
+            self::load_3(self::substr($s, 26, 3)) << 4
+        );
+        /** @var ParagonIE_Sodium_Core32_Int32 $h9 */
+        $h9 = ParagonIE_Sodium_Core32_Int32::fromInt(
+            (self::load_3(self::substr($s, 29, 3)) & 8388607) << 2
+        );
+
+        $carry9 = $h9->addInt(1 << 24)->shiftRight(25);
+        $h0 = $h0->addInt32($carry9->mulInt(19, 5));
+        $h9 = $h9->subInt32($carry9->shiftLeft(25));
+
+        $carry1 = $h1->addInt(1 << 24)->shiftRight(25);
+        $h2 = $h2->addInt32($carry1);
+        $h1 = $h1->subInt32($carry1->shiftLeft(25));
+
+        $carry3 = $h3->addInt(1 << 24)->shiftRight(25);
+        $h4 = $h4->addInt32($carry3);
+        $h3 = $h3->subInt32($carry3->shiftLeft(25));
+
+        $carry5 = $h5->addInt(1 << 24)->shiftRight(25);
+        $h6 = $h6->addInt32($carry5);
+        $h5 = $h5->subInt32($carry5->shiftLeft(25));
+
+        $carry7 = $h7->addInt(1 << 24)->shiftRight(25);
+        $h8 = $h8->addInt32($carry7);
+        $h7 = $h7->subInt32($carry7->shiftLeft(25));
+
+        $carry0 = $h0->addInt(1 << 25)->shiftRight(26);
+        $h1 = $h1->addInt32($carry0);
+        $h0 = $h0->subInt32($carry0->shiftLeft(26));
+
+        $carry2 = $h2->addInt(1 << 25)->shiftRight(26);
+        $h3 = $h3->addInt32($carry2);
+        $h2 = $h2->subInt32($carry2->shiftLeft(26));
+
+        $carry4 = $h4->addInt(1 << 25)->shiftRight(26);
+        $h5 = $h5->addInt32($carry4);
+        $h4 = $h4->subInt32($carry4->shiftLeft(26));
+
+        $carry6 = $h6->addInt(1 << 25)->shiftRight(26);
+        $h7 = $h7->addInt32($carry6);
+        $h6 = $h6->subInt32($carry6->shiftLeft(26));
+
+        $carry8 = $h8->addInt(1 << 25)->shiftRight(26);
+        $h9 = $h9->addInt32($carry8);
+        $h8 = $h8->subInt32($carry8->shiftLeft(26));
+
+        return ParagonIE_Sodium_Core32_Curve25519_Fe::fromArray(
+            array($h0, $h1, $h2,$h3, $h4, $h5, $h6, $h7, $h8, $h9)
+        );
+    }
+
+    /**
+     * Convert a field element to a byte string.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe $h
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedAssignment
+     * @psalm-suppress MixedMethodCall
+     */
+    public static function fe_tobytes(ParagonIE_Sodium_Core32_Curve25519_Fe $h)
+    {
+        /**
+         * @var ParagonIE_Sodium_Core32_Int64[] $f
+         * @var ParagonIE_Sodium_Core32_Int64 $q
+         */
+        $f = array();
+
+        for ($i = 0; $i < 10; ++$i) {
+            $f[$i] = $h[$i]->toInt64();
+        }
+
+        $q = $f[9]->mulInt(19, 5)->addInt(1 << 14)->shiftRight(25)
+            ->addInt64($f[0])->shiftRight(26)
+            ->addInt64($f[1])->shiftRight(25)
+            ->addInt64($f[2])->shiftRight(26)
+            ->addInt64($f[3])->shiftRight(25)
+            ->addInt64($f[4])->shiftRight(26)
+            ->addInt64($f[5])->shiftRight(25)
+            ->addInt64($f[6])->shiftRight(26)
+            ->addInt64($f[7])->shiftRight(25)
+            ->addInt64($f[8])->shiftRight(26)
+            ->addInt64($f[9])->shiftRight(25);
+
+        $f[0] = $f[0]->addInt64($q->mulInt(19, 5));
+
+        $carry0 = $f[0]->shiftRight(26);
+        $f[1] = $f[1]->addInt64($carry0);
+        $f[0] = $f[0]->subInt64($carry0->shiftLeft(26));
+
+        $carry1 = $f[1]->shiftRight(25);
+        $f[2] = $f[2]->addInt64($carry1);
+        $f[1] = $f[1]->subInt64($carry1->shiftLeft(25));
+
+        $carry2 = $f[2]->shiftRight(26);
+        $f[3] = $f[3]->addInt64($carry2);
+        $f[2] = $f[2]->subInt64($carry2->shiftLeft(26));
+
+        $carry3 = $f[3]->shiftRight(25);
+        $f[4] = $f[4]->addInt64($carry3);
+        $f[3] = $f[3]->subInt64($carry3->shiftLeft(25));
+
+        $carry4 = $f[4]->shiftRight(26);
+        $f[5] = $f[5]->addInt64($carry4);
+        $f[4] = $f[4]->subInt64($carry4->shiftLeft(26));
+
+        $carry5 = $f[5]->shiftRight(25);
+        $f[6] = $f[6]->addInt64($carry5);
+        $f[5] = $f[5]->subInt64($carry5->shiftLeft(25));
+
+        $carry6 = $f[6]->shiftRight(26);
+        $f[7] = $f[7]->addInt64($carry6);
+        $f[6] = $f[6]->subInt64($carry6->shiftLeft(26));
+
+        $carry7 = $f[7]->shiftRight(25);
+        $f[8] = $f[8]->addInt64($carry7);
+        $f[7] = $f[7]->subInt64($carry7->shiftLeft(25));
+
+        $carry8 = $f[8]->shiftRight(26);
+        $f[9] = $f[9]->addInt64($carry8);
+        $f[8] = $f[8]->subInt64($carry8->shiftLeft(26));
+
+        $carry9 = $f[9]->shiftRight(25);
+        $f[9] = $f[9]->subInt64($carry9->shiftLeft(25));
+
+        /** @var int $h0 */
+        $h0 = $f[0]->toInt32()->toInt();
+        /** @var int $h1 */
+        $h1 = $f[1]->toInt32()->toInt();
+        /** @var int $h2 */
+        $h2 = $f[2]->toInt32()->toInt();
+        /** @var int $h3 */
+        $h3 = $f[3]->toInt32()->toInt();
+        /** @var int $h4 */
+        $h4 = $f[4]->toInt32()->toInt();
+        /** @var int $h5 */
+        $h5 = $f[5]->toInt32()->toInt();
+        /** @var int $h6 */
+        $h6 = $f[6]->toInt32()->toInt();
+        /** @var int $h7 */
+        $h7 = $f[7]->toInt32()->toInt();
+        /** @var int $h8 */
+        $h8 = $f[8]->toInt32()->toInt();
+        /** @var int $h9 */
+        $h9 = $f[9]->toInt32()->toInt();
+
+        /**
+         * @var array<int, int>
+         */
+        $s = array(
+            (int) (($h0 >> 0) & 0xff),
+            (int) (($h0 >> 8) & 0xff),
+            (int) (($h0 >> 16) & 0xff),
+            (int) ((($h0 >> 24) | ($h1 << 2)) & 0xff),
+            (int) (($h1 >> 6) & 0xff),
+            (int) (($h1 >> 14) & 0xff),
+            (int) ((($h1 >> 22) | ($h2 << 3)) & 0xff),
+            (int) (($h2 >> 5) & 0xff),
+            (int) (($h2 >> 13) & 0xff),
+            (int) ((($h2 >> 21) | ($h3 << 5)) & 0xff),
+            (int) (($h3 >> 3) & 0xff),
+            (int) (($h3 >> 11) & 0xff),
+            (int) ((($h3 >> 19) | ($h4 << 6)) & 0xff),
+            (int) (($h4 >> 2) & 0xff),
+            (int) (($h4 >> 10) & 0xff),
+            (int) (($h4 >> 18) & 0xff),
+            (int) (($h5 >> 0) & 0xff),
+            (int) (($h5 >> 8) & 0xff),
+            (int) (($h5 >> 16) & 0xff),
+            (int) ((($h5 >> 24) | ($h6 << 1)) & 0xff),
+            (int) (($h6 >> 7) & 0xff),
+            (int) (($h6 >> 15) & 0xff),
+            (int) ((($h6 >> 23) | ($h7 << 3)) & 0xff),
+            (int) (($h7 >> 5) & 0xff),
+            (int) (($h7 >> 13) & 0xff),
+            (int) ((($h7 >> 21) | ($h8 << 4)) & 0xff),
+            (int) (($h8 >> 4) & 0xff),
+            (int) (($h8 >> 12) & 0xff),
+            (int) ((($h8 >> 20) | ($h9 << 6)) & 0xff),
+            (int) (($h9 >> 2) & 0xff),
+            (int) (($h9 >> 10) & 0xff),
+            (int) (($h9 >> 18) & 0xff)
+        );
+        return self::intArrayToString($s);
+    }
+
+    /**
+     * Is a field element negative? (1 = yes, 0 = no. Used in calculations.)
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe $f
+     * @return int
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function fe_isnegative(ParagonIE_Sodium_Core32_Curve25519_Fe $f)
+    {
+        $str = self::fe_tobytes($f);
+        return (int) (self::chrToInt($str[0]) & 1);
+    }
+
+    /**
+     * Returns 0 if this field element results in all NUL bytes.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe $f
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function fe_isnonzero(ParagonIE_Sodium_Core32_Curve25519_Fe $f)
+    {
+        static $zero;
+        if ($zero === null) {
+            $zero = str_repeat("\x00", 32);
+        }
+        /** @var string $str */
+        $str = self::fe_tobytes($f);
+        /** @var string $zero */
+        return !self::verify_32($str, $zero);
+    }
+
+    /**
+     * Multiply two field elements
+     *
+     * h = f * g
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @security Is multiplication a source of timing leaks? If so, can we do
+     *           anything to prevent that from happening?
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe $f
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe $g
+     * @return ParagonIE_Sodium_Core32_Curve25519_Fe
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function fe_mul(
+        ParagonIE_Sodium_Core32_Curve25519_Fe $f,
+        ParagonIE_Sodium_Core32_Curve25519_Fe $g
+    ) {
+        /**
+         * @var ParagonIE_Sodium_Core32_Int32[] $f
+         * @var ParagonIE_Sodium_Core32_Int32[] $g
+         * @var ParagonIE_Sodium_Core32_Int64 $f0
+         * @var ParagonIE_Sodium_Core32_Int64 $f1
+         * @var ParagonIE_Sodium_Core32_Int64 $f2
+         * @var ParagonIE_Sodium_Core32_Int64 $f3
+         * @var ParagonIE_Sodium_Core32_Int64 $f4
+         * @var ParagonIE_Sodium_Core32_Int64 $f5
+         * @var ParagonIE_Sodium_Core32_Int64 $f6
+         * @var ParagonIE_Sodium_Core32_Int64 $f7
+         * @var ParagonIE_Sodium_Core32_Int64 $f8
+         * @var ParagonIE_Sodium_Core32_Int64 $f9
+         * @var ParagonIE_Sodium_Core32_Int64 $g0
+         * @var ParagonIE_Sodium_Core32_Int64 $g1
+         * @var ParagonIE_Sodium_Core32_Int64 $g2
+         * @var ParagonIE_Sodium_Core32_Int64 $g3
+         * @var ParagonIE_Sodium_Core32_Int64 $g4
+         * @var ParagonIE_Sodium_Core32_Int64 $g5
+         * @var ParagonIE_Sodium_Core32_Int64 $g6
+         * @var ParagonIE_Sodium_Core32_Int64 $g7
+         * @var ParagonIE_Sodium_Core32_Int64 $g8
+         * @var ParagonIE_Sodium_Core32_Int64 $g9
+         */
+        $f0 = $f[0]->toInt64();
+        $f1 = $f[1]->toInt64();
+        $f2 = $f[2]->toInt64();
+        $f3 = $f[3]->toInt64();
+        $f4 = $f[4]->toInt64();
+        $f5 = $f[5]->toInt64();
+        $f6 = $f[6]->toInt64();
+        $f7 = $f[7]->toInt64();
+        $f8 = $f[8]->toInt64();
+        $f9 = $f[9]->toInt64();
+        $g0 = $g[0]->toInt64();
+        $g1 = $g[1]->toInt64();
+        $g2 = $g[2]->toInt64();
+        $g3 = $g[3]->toInt64();
+        $g4 = $g[4]->toInt64();
+        $g5 = $g[5]->toInt64();
+        $g6 = $g[6]->toInt64();
+        $g7 = $g[7]->toInt64();
+        $g8 = $g[8]->toInt64();
+        $g9 = $g[9]->toInt64();
+        $g1_19 = $g1->mulInt(19, 5); /* 2^4 <= 19 <= 2^5, but we only want 5 bits */
+        $g2_19 = $g2->mulInt(19, 5);
+        $g3_19 = $g3->mulInt(19, 5);
+        $g4_19 = $g4->mulInt(19, 5);
+        $g5_19 = $g5->mulInt(19, 5);
+        $g6_19 = $g6->mulInt(19, 5);
+        $g7_19 = $g7->mulInt(19, 5);
+        $g8_19 = $g8->mulInt(19, 5);
+        $g9_19 = $g9->mulInt(19, 5);
+        /** @var ParagonIE_Sodium_Core32_Int64 $f1_2 */
+        $f1_2 = $f1->shiftLeft(1);
+        /** @var ParagonIE_Sodium_Core32_Int64 $f3_2 */
+        $f3_2 = $f3->shiftLeft(1);
+        /** @var ParagonIE_Sodium_Core32_Int64 $f5_2 */
+        $f5_2 = $f5->shiftLeft(1);
+        /** @var ParagonIE_Sodium_Core32_Int64 $f7_2 */
+        $f7_2 = $f7->shiftLeft(1);
+        /** @var ParagonIE_Sodium_Core32_Int64 $f9_2 */
+        $f9_2 = $f9->shiftLeft(1);
+        $f0g0    = $f0->mulInt64($g0, 27);
+        $f0g1    = $f0->mulInt64($g1, 27);
+        $f0g2    = $f0->mulInt64($g2, 27);
+        $f0g3    = $f0->mulInt64($g3, 27);
+        $f0g4    = $f0->mulInt64($g4, 27);
+        $f0g5    = $f0->mulInt64($g5, 27);
+        $f0g6    = $f0->mulInt64($g6, 27);
+        $f0g7    = $f0->mulInt64($g7, 27);
+        $f0g8    = $f0->mulInt64($g8, 27);
+        $f0g9    = $f0->mulInt64($g9, 27);
+        $f1g0    = $f1->mulInt64($g0, 27);
+        $f1g1_2  = $f1_2->mulInt64($g1, 27);
+        $f1g2    = $f1->mulInt64($g2, 27);
+        $f1g3_2  = $f1_2->mulInt64($g3, 27);
+        $f1g4    = $f1->mulInt64($g4, 30);
+        $f1g5_2  = $f1_2->mulInt64($g5, 30);
+        $f1g6    = $f1->mulInt64($g6, 30);
+        $f1g7_2  = $f1_2->mulInt64($g7, 30);
+        $f1g8    = $f1->mulInt64($g8, 30);
+        $f1g9_38 = $g9_19->mulInt64($f1_2, 30);
+        $f2g0    = $f2->mulInt64($g0, 30);
+        $f2g1    = $f2->mulInt64($g1, 29);
+        $f2g2    = $f2->mulInt64($g2, 30);
+        $f2g3    = $f2->mulInt64($g3, 29);
+        $f2g4    = $f2->mulInt64($g4, 30);
+        $f2g5    = $f2->mulInt64($g5, 29);
+        $f2g6    = $f2->mulInt64($g6, 30);
+        $f2g7    = $f2->mulInt64($g7, 29);
+        $f2g8_19 = $g8_19->mulInt64($f2, 30);
+        $f2g9_19 = $g9_19->mulInt64($f2, 30);
+        $f3g0    = $f3->mulInt64($g0, 30);
+        $f3g1_2  = $f3_2->mulInt64($g1, 30);
+        $f3g2    = $f3->mulInt64($g2, 30);
+        $f3g3_2  = $f3_2->mulInt64($g3, 30);
+        $f3g4    = $f3->mulInt64($g4, 30);
+        $f3g5_2  = $f3_2->mulInt64($g5, 30);
+        $f3g6    = $f3->mulInt64($g6, 30);
+        $f3g7_38 = $g7_19->mulInt64($f3_2, 30);
+        $f3g8_19 = $g8_19->mulInt64($f3, 30);
+        $f3g9_38 = $g9_19->mulInt64($f3_2, 30);
+        $f4g0    = $f4->mulInt64($g0, 30);
+        $f4g1    = $f4->mulInt64($g1, 30);
+        $f4g2    = $f4->mulInt64($g2, 30);
+        $f4g3    = $f4->mulInt64($g3, 30);
+        $f4g4    = $f4->mulInt64($g4, 30);
+        $f4g5    = $f4->mulInt64($g5, 30);
+        $f4g6_19 = $g6_19->mulInt64($f4, 30);
+        $f4g7_19 = $g7_19->mulInt64($f4, 30);
+        $f4g8_19 = $g8_19->mulInt64($f4, 30);
+        $f4g9_19 = $g9_19->mulInt64($f4, 30);
+        $f5g0    = $f5->mulInt64($g0, 30);
+        $f5g1_2  = $f5_2->mulInt64($g1, 30);
+        $f5g2    = $f5->mulInt64($g2, 30);
+        $f5g3_2  = $f5_2->mulInt64($g3, 30);
+        $f5g4    = $f5->mulInt64($g4, 30);
+        $f5g5_38 = $g5_19->mulInt64($f5_2, 30);
+        $f5g6_19 = $g6_19->mulInt64($f5, 30);
+        $f5g7_38 = $g7_19->mulInt64($f5_2, 30);
+        $f5g8_19 = $g8_19->mulInt64($f5, 30);
+        $f5g9_38 = $g9_19->mulInt64($f5_2, 30);
+        $f6g0    = $f6->mulInt64($g0, 30);
+        $f6g1    = $f6->mulInt64($g1, 30);
+        $f6g2    = $f6->mulInt64($g2, 30);
+        $f6g3    = $f6->mulInt64($g3, 30);
+        $f6g4_19 = $g4_19->mulInt64($f6, 30);
+        $f6g5_19 = $g5_19->mulInt64($f6, 30);
+        $f6g6_19 = $g6_19->mulInt64($f6, 30);
+        $f6g7_19 = $g7_19->mulInt64($f6, 30);
+        $f6g8_19 = $g8_19->mulInt64($f6, 30);
+        $f6g9_19 = $g9_19->mulInt64($f6, 30);
+        $f7g0    = $f7->mulInt64($g0, 30);
+        $f7g1_2  = $g1->mulInt64($f7_2, 30);
+        $f7g2    = $f7->mulInt64($g2, 30);
+        $f7g3_38 = $g3_19->mulInt64($f7_2, 30);
+        $f7g4_19 = $g4_19->mulInt64($f7, 30);
+        $f7g5_38 = $g5_19->mulInt64($f7_2, 30);
+        $f7g6_19 = $g6_19->mulInt64($f7, 30);
+        $f7g7_38 = $g7_19->mulInt64($f7_2, 30);
+        $f7g8_19 = $g8_19->mulInt64($f7, 30);
+        $f7g9_38 = $g9_19->mulInt64($f7_2, 30);
+        $f8g0    = $f8->mulInt64($g0, 30);
+        $f8g1    = $f8->mulInt64($g1, 29);
+        $f8g2_19 = $g2_19->mulInt64($f8, 30);
+        $f8g3_19 = $g3_19->mulInt64($f8, 30);
+        $f8g4_19 = $g4_19->mulInt64($f8, 30);
+        $f8g5_19 = $g5_19->mulInt64($f8, 30);
+        $f8g6_19 = $g6_19->mulInt64($f8, 30);
+        $f8g7_19 = $g7_19->mulInt64($f8, 30);
+        $f8g8_19 = $g8_19->mulInt64($f8, 30);
+        $f8g9_19 = $g9_19->mulInt64($f8, 30);
+        $f9g0    = $f9->mulInt64($g0, 30);
+        $f9g1_38 = $g1_19->mulInt64($f9_2, 30);
+        $f9g2_19 = $g2_19->mulInt64($f9, 30);
+        $f9g3_38 = $g3_19->mulInt64($f9_2, 30);
+        $f9g4_19 = $g4_19->mulInt64($f9, 30);
+        $f9g5_38 = $g5_19->mulInt64($f9_2, 30);
+        $f9g6_19 = $g6_19->mulInt64($f9, 30);
+        $f9g7_38 = $g7_19->mulInt64($f9_2, 30);
+        $f9g8_19 = $g8_19->mulInt64($f9, 30);
+        $f9g9_38 = $g9_19->mulInt64($f9_2, 30);
+
+        // $h0 = $f0g0 + $f1g9_38 + $f2g8_19 + $f3g7_38 + $f4g6_19 + $f5g5_38 + $f6g4_19 + $f7g3_38 + $f8g2_19 + $f9g1_38;
+        $h0 = $f0g0->addInt64($f1g9_38)->addInt64($f2g8_19)->addInt64($f3g7_38)
+            ->addInt64($f4g6_19)->addInt64($f5g5_38)->addInt64($f6g4_19)
+            ->addInt64($f7g3_38)->addInt64($f8g2_19)->addInt64($f9g1_38);
+
+        // $h1 = $f0g1 + $f1g0    + $f2g9_19 + $f3g8_19 + $f4g7_19 + $f5g6_19 + $f6g5_19 + $f7g4_19 + $f8g3_19 + $f9g2_19;
+        $h1 = $f0g1->addInt64($f1g0)->addInt64($f2g9_19)->addInt64($f3g8_19)
+            ->addInt64($f4g7_19)->addInt64($f5g6_19)->addInt64($f6g5_19)
+            ->addInt64($f7g4_19)->addInt64($f8g3_19)->addInt64($f9g2_19);
+
+        // $h2 = $f0g2 + $f1g1_2  + $f2g0    + $f3g9_38 + $f4g8_19 + $f5g7_38 + $f6g6_19 + $f7g5_38 + $f8g4_19 + $f9g3_38;
+        $h2 = $f0g2->addInt64($f1g1_2)->addInt64($f2g0)->addInt64($f3g9_38)
+            ->addInt64($f4g8_19)->addInt64($f5g7_38)->addInt64($f6g6_19)
+            ->addInt64($f7g5_38)->addInt64($f8g4_19)->addInt64($f9g3_38);
+
+        // $h3 = $f0g3 + $f1g2    + $f2g1    + $f3g0    + $f4g9_19 + $f5g8_19 + $f6g7_19 + $f7g6_19 + $f8g5_19 + $f9g4_19;
+        $h3 = $f0g3->addInt64($f1g2)->addInt64($f2g1)->addInt64($f3g0)
+            ->addInt64($f4g9_19)->addInt64($f5g8_19)->addInt64($f6g7_19)
+            ->addInt64($f7g6_19)->addInt64($f8g5_19)->addInt64($f9g4_19);
+
+        // $h4 = $f0g4 + $f1g3_2  + $f2g2    + $f3g1_2  + $f4g0    + $f5g9_38 + $f6g8_19 + $f7g7_38 + $f8g6_19 + $f9g5_38;
+        $h4 = $f0g4->addInt64($f1g3_2)->addInt64($f2g2)->addInt64($f3g1_2)
+            ->addInt64($f4g0)->addInt64($f5g9_38)->addInt64($f6g8_19)
+            ->addInt64($f7g7_38)->addInt64($f8g6_19)->addInt64($f9g5_38);
+
+        // $h5 = $f0g5 + $f1g4    + $f2g3    + $f3g2    + $f4g1    + $f5g0    + $f6g9_19 + $f7g8_19 + $f8g7_19 + $f9g6_19;
+        $h5 = $f0g5->addInt64($f1g4)->addInt64($f2g3)->addInt64($f3g2)
+            ->addInt64($f4g1)->addInt64($f5g0)->addInt64($f6g9_19)
+            ->addInt64($f7g8_19)->addInt64($f8g7_19)->addInt64($f9g6_19);
+
+        // $h6 = $f0g6 + $f1g5_2  + $f2g4    + $f3g3_2  + $f4g2    + $f5g1_2  + $f6g0    + $f7g9_38 + $f8g8_19 + $f9g7_38;
+        $h6 = $f0g6->addInt64($f1g5_2)->addInt64($f2g4)->addInt64($f3g3_2)
+            ->addInt64($f4g2)->addInt64($f5g1_2)->addInt64($f6g0)
+            ->addInt64($f7g9_38)->addInt64($f8g8_19)->addInt64($f9g7_38);
+
+        // $h7 = $f0g7 + $f1g6    + $f2g5    + $f3g4    + $f4g3    + $f5g2    + $f6g1    + $f7g0    + $f8g9_19 + $f9g8_19;
+        $h7 = $f0g7->addInt64($f1g6)->addInt64($f2g5)->addInt64($f3g4)
+            ->addInt64($f4g3)->addInt64($f5g2)->addInt64($f6g1)
+            ->addInt64($f7g0)->addInt64($f8g9_19)->addInt64($f9g8_19);
+
+        // $h8 = $f0g8 + $f1g7_2  + $f2g6    + $f3g5_2  + $f4g4    + $f5g3_2  + $f6g2    + $f7g1_2  + $f8g0    + $f9g9_38;
+        $h8 = $f0g8->addInt64($f1g7_2)->addInt64($f2g6)->addInt64($f3g5_2)
+            ->addInt64($f4g4)->addInt64($f5g3_2)->addInt64($f6g2)
+            ->addInt64($f7g1_2)->addInt64($f8g0)->addInt64($f9g9_38);
+
+        // $h9 = $f0g9 + $f1g8    + $f2g7    + $f3g6    + $f4g5    + $f5g4    + $f6g3    + $f7g2    + $f8g1    + $f9g0   ;
+        $h9 = $f0g9->addInt64($f1g8)->addInt64($f2g7)->addInt64($f3g6)
+            ->addInt64($f4g5)->addInt64($f5g4)->addInt64($f6g3)
+            ->addInt64($f7g2)->addInt64($f8g1)->addInt64($f9g0);
+
+        /**
+         * @var ParagonIE_Sodium_Core32_Int64 $h0
+         * @var ParagonIE_Sodium_Core32_Int64 $h1
+         * @var ParagonIE_Sodium_Core32_Int64 $h2
+         * @var ParagonIE_Sodium_Core32_Int64 $h3
+         * @var ParagonIE_Sodium_Core32_Int64 $h4
+         * @var ParagonIE_Sodium_Core32_Int64 $h5
+         * @var ParagonIE_Sodium_Core32_Int64 $h6
+         * @var ParagonIE_Sodium_Core32_Int64 $h7
+         * @var ParagonIE_Sodium_Core32_Int64 $h8
+         * @var ParagonIE_Sodium_Core32_Int64 $h9
+         * @var ParagonIE_Sodium_Core32_Int64 $carry0
+         * @var ParagonIE_Sodium_Core32_Int64 $carry1
+         * @var ParagonIE_Sodium_Core32_Int64 $carry2
+         * @var ParagonIE_Sodium_Core32_Int64 $carry3
+         * @var ParagonIE_Sodium_Core32_Int64 $carry4
+         * @var ParagonIE_Sodium_Core32_Int64 $carry5
+         * @var ParagonIE_Sodium_Core32_Int64 $carry6
+         * @var ParagonIE_Sodium_Core32_Int64 $carry7
+         * @var ParagonIE_Sodium_Core32_Int64 $carry8
+         * @var ParagonIE_Sodium_Core32_Int64 $carry9
+         */
+        $carry0 = $h0->addInt(1 << 25)->shiftRight(26);
+        $h1 = $h1->addInt64($carry0);
+        $h0 = $h0->subInt64($carry0->shiftLeft(26));
+        $carry4 = $h4->addInt(1 << 25)->shiftRight(26);
+        $h5 = $h5->addInt64($carry4);
+        $h4 = $h4->subInt64($carry4->shiftLeft(26));
+
+        $carry1 = $h1->addInt(1 << 24)->shiftRight(25);
+        $h2 = $h2->addInt64($carry1);
+        $h1 = $h1->subInt64($carry1->shiftLeft(25));
+        $carry5 = $h5->addInt(1 << 24)->shiftRight(25);
+        $h6 = $h6->addInt64($carry5);
+        $h5 = $h5->subInt64($carry5->shiftLeft(25));
+
+        $carry2 = $h2->addInt(1 << 25)->shiftRight(26);
+        $h3 = $h3->addInt64($carry2);
+        $h2 = $h2->subInt64($carry2->shiftLeft(26));
+        $carry6 = $h6->addInt(1 << 25)->shiftRight(26);
+        $h7 = $h7->addInt64($carry6);
+        $h6 = $h6->subInt64($carry6->shiftLeft(26));
+
+        $carry3 = $h3->addInt(1 << 24)->shiftRight(25);
+        $h4 = $h4->addInt64($carry3);
+        $h3 = $h3->subInt64($carry3->shiftLeft(25));
+        $carry7 = $h7->addInt(1 << 24)->shiftRight(25);
+        $h8 = $h8->addInt64($carry7);
+        $h7 = $h7->subInt64($carry7->shiftLeft(25));
+
+        $carry4 = $h4->addInt(1 << 25)->shiftRight(26);
+        $h5 = $h5->addInt64($carry4);
+        $h4 = $h4->subInt64($carry4->shiftLeft(26));
+        $carry8 = $h8->addInt(1 << 25)->shiftRight(26);
+        $h9 = $h9->addInt64($carry8);
+        $h8 = $h8->subInt64($carry8->shiftLeft(26));
+
+        $carry9 = $h9->addInt(1 << 24)->shiftRight(25);
+        $h0 = $h0->addInt64($carry9->mulInt(19, 5));
+        $h9 = $h9->subInt64($carry9->shiftLeft(25));
+
+        $carry0 = $h0->addInt(1 << 25)->shiftRight(26);
+        $h1 = $h1->addInt64($carry0);
+        $h0 = $h0->subInt64($carry0->shiftLeft(26));
+
+        return ParagonIE_Sodium_Core32_Curve25519_Fe::fromArray(
+            array(
+                $h0->toInt32(),
+                $h1->toInt32(),
+                $h2->toInt32(),
+                $h3->toInt32(),
+                $h4->toInt32(),
+                $h5->toInt32(),
+                $h6->toInt32(),
+                $h7->toInt32(),
+                $h8->toInt32(),
+                $h9->toInt32()
+            )
+        );
+    }
+
+    /**
+     * Get the negative values for each piece of the field element.
+     *
+     * h = -f
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe $f
+     * @return ParagonIE_Sodium_Core32_Curve25519_Fe
+     * @psalm-suppress MixedAssignment
+     * @psalm-suppress MixedMethodCall
+     */
+    public static function fe_neg(ParagonIE_Sodium_Core32_Curve25519_Fe $f)
+    {
+        $h = new ParagonIE_Sodium_Core32_Curve25519_Fe();
+        for ($i = 0; $i < 10; ++$i) {
+            $h[$i] = $h[$i]->subInt32($f[$i]);
+        }
+        return $h;
+    }
+
+    /**
+     * Square a field element
+     *
+     * h = f * f
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe $f
+     * @return ParagonIE_Sodium_Core32_Curve25519_Fe
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedMethodCall
+     */
+    public static function fe_sq(ParagonIE_Sodium_Core32_Curve25519_Fe $f)
+    {
+        /** @var ParagonIE_Sodium_Core32_Int64 $f0 */
+        $f0 = $f[0]->toInt64();
+        /** @var ParagonIE_Sodium_Core32_Int64 $f1 */
+        $f1 = $f[1]->toInt64();
+        /** @var ParagonIE_Sodium_Core32_Int64 $f2 */
+        $f2 = $f[2]->toInt64();
+        /** @var ParagonIE_Sodium_Core32_Int64 $f3 */
+        $f3 = $f[3]->toInt64();
+        /** @var ParagonIE_Sodium_Core32_Int64 $f4 */
+        $f4 = $f[4]->toInt64();
+        /** @var ParagonIE_Sodium_Core32_Int64 $f5 */
+        $f5 = $f[5]->toInt64();
+        /** @var ParagonIE_Sodium_Core32_Int64 $f6 */
+        $f6 = $f[6]->toInt64();
+        /** @var ParagonIE_Sodium_Core32_Int64 $f7 */
+        $f7 = $f[7]->toInt64();
+        /** @var ParagonIE_Sodium_Core32_Int64 $f8 */
+        $f8 = $f[8]->toInt64();
+        /** @var ParagonIE_Sodium_Core32_Int64 $f9 */
+        $f9 = $f[9]->toInt64();
+
+        /** @var ParagonIE_Sodium_Core32_Int64 $f0_2 */
+        $f0_2 = $f0->shiftLeft(1);
+        $f1_2 = $f1->shiftLeft(1);
+        $f2_2 = $f2->shiftLeft(1);
+        $f3_2 = $f3->shiftLeft(1);
+        $f4_2 = $f4->shiftLeft(1);
+        $f5_2 = $f5->shiftLeft(1);
+        $f6_2 = $f6->shiftLeft(1);
+        $f7_2 = $f7->shiftLeft(1);
+        $f5_38 = $f5->mulInt(38, 6);
+        $f6_19 = $f6->mulInt(19, 5);
+        $f7_38 = $f7->mulInt(38, 6);
+        $f8_19 = $f8->mulInt(19, 5);
+        $f9_38 = $f9->mulInt(38, 6);
+        /** @var ParagonIE_Sodium_Core32_Int64 $f0f0*/
+        $f0f0    = $f0->mulInt64($f0, 28);
+        $f0f1_2  = $f0_2->mulInt64($f1, 28);
+        $f0f2_2 =  $f0_2->mulInt64($f2, 28);
+        $f0f3_2 =  $f0_2->mulInt64($f3, 28);
+        $f0f4_2 =  $f0_2->mulInt64($f4, 28);
+        $f0f5_2 =  $f0_2->mulInt64($f5, 28);
+        $f0f6_2 =  $f0_2->mulInt64($f6, 28);
+        $f0f7_2 =  $f0_2->mulInt64($f7, 28);
+        $f0f8_2 =  $f0_2->mulInt64($f8, 28);
+        $f0f9_2 =  $f0_2->mulInt64($f9, 28);
+
+        $f1f1_2 = $f1_2->mulInt64($f1, 28);
+        $f1f2_2 = $f1_2->mulInt64($f2, 28);
+        $f1f3_4 = $f1_2->mulInt64($f3_2, 28);
+        $f1f4_2 = $f1_2->mulInt64($f4, 28);
+        $f1f5_4 = $f1_2->mulInt64($f5_2, 30);
+        $f1f6_2 = $f1_2->mulInt64($f6, 28);
+        $f1f7_4 = $f1_2->mulInt64($f7_2, 28);
+        $f1f8_2 = $f1_2->mulInt64($f8, 28);
+        $f1f9_76 = $f9_38->mulInt64($f1_2, 30);
+
+        $f2f2 = $f2->mulInt64($f2, 28);
+        $f2f3_2 = $f2_2->mulInt64($f3, 28);
+        $f2f4_2 = $f2_2->mulInt64($f4, 28);
+        $f2f5_2 = $f2_2->mulInt64($f5, 28);
+        $f2f6_2 = $f2_2->mulInt64($f6, 28);
+        $f2f7_2 = $f2_2->mulInt64($f7, 28);
+        $f2f8_38 = $f8_19->mulInt64($f2_2, 30);
+        $f2f9_38 = $f9_38->mulInt64($f2, 30);
+
+        $f3f3_2 = $f3_2->mulInt64($f3, 28);
+        $f3f4_2 = $f3_2->mulInt64($f4, 28);
+        $f3f5_4 = $f3_2->mulInt64($f5_2, 30);
+        $f3f6_2 = $f3_2->mulInt64($f6, 28);
+        $f3f7_76 = $f7_38->mulInt64($f3_2, 30);
+        $f3f8_38 = $f8_19->mulInt64($f3_2, 30);
+        $f3f9_76 = $f9_38->mulInt64($f3_2, 30);
+
+        $f4f4 = $f4->mulInt64($f4, 28);
+        $f4f5_2 = $f4_2->mulInt64($f5, 28);
+        $f4f6_38 = $f6_19->mulInt64($f4_2, 30);
+        $f4f7_38 = $f7_38->mulInt64($f4, 30);
+        $f4f8_38 = $f8_19->mulInt64($f4_2, 30);
+        $f4f9_38 = $f9_38->mulInt64($f4, 30);
+
+        $f5f5_38 = $f5_38->mulInt64($f5, 30);
+        $f5f6_38 = $f6_19->mulInt64($f5_2, 30);
+        $f5f7_76 = $f7_38->mulInt64($f5_2, 30);
+        $f5f8_38 = $f8_19->mulInt64($f5_2, 30);
+        $f5f9_76 = $f9_38->mulInt64($f5_2, 30);
+
+        $f6f6_19 = $f6_19->mulInt64($f6, 30);
+        $f6f7_38 = $f7_38->mulInt64($f6, 30);
+        $f6f8_38 = $f8_19->mulInt64($f6_2, 30);
+        $f6f9_38 = $f9_38->mulInt64($f6, 30);
+
+        $f7f7_38 = $f7_38->mulInt64($f7, 28);
+        $f7f8_38 = $f8_19->mulInt64($f7_2, 30);
+        $f7f9_76 = $f9_38->mulInt64($f7_2, 30);
+
+        $f8f8_19 = $f8_19->mulInt64($f8, 30);
+        $f8f9_38 = $f9_38->mulInt64($f8, 30);
+
+        $f9f9_38 = $f9_38->mulInt64($f9, 28);
+
+        $h0 = $f0f0->addInt64($f1f9_76)->addInt64($f2f8_38)->addInt64($f3f7_76)->addInt64($f4f6_38)->addInt64($f5f5_38);
+        $h1 = $f0f1_2->addInt64($f2f9_38)->addInt64($f3f8_38)->addInt64($f4f7_38)->addInt64($f5f6_38);
+        $h2 = $f0f2_2->addInt64($f1f1_2)->addInt64($f3f9_76)->addInt64($f4f8_38)->addInt64($f5f7_76)->addInt64($f6f6_19);
+        $h3 = $f0f3_2->addInt64($f1f2_2)->addInt64($f4f9_38)->addInt64($f5f8_38)->addInt64($f6f7_38);
+        $h4 = $f0f4_2->addInt64($f1f3_4)->addInt64($f2f2)->addInt64($f5f9_76)->addInt64($f6f8_38)->addInt64($f7f7_38);
+        $h5 = $f0f5_2->addInt64($f1f4_2)->addInt64($f2f3_2)->addInt64($f6f9_38)->addInt64($f7f8_38);
+        $h6 = $f0f6_2->addInt64($f1f5_4)->addInt64($f2f4_2)->addInt64($f3f3_2)->addInt64($f7f9_76)->addInt64($f8f8_19);
+        $h7 = $f0f7_2->addInt64($f1f6_2)->addInt64($f2f5_2)->addInt64($f3f4_2)->addInt64($f8f9_38);
+        $h8 = $f0f8_2->addInt64($f1f7_4)->addInt64($f2f6_2)->addInt64($f3f5_4)->addInt64($f4f4)->addInt64($f9f9_38);
+        $h9 = $f0f9_2->addInt64($f1f8_2)->addInt64($f2f7_2)->addInt64($f3f6_2)->addInt64($f4f5_2);
+
+        /**
+         * @var ParagonIE_Sodium_Core32_Int64 $h0
+         * @var ParagonIE_Sodium_Core32_Int64 $h1
+         * @var ParagonIE_Sodium_Core32_Int64 $h2
+         * @var ParagonIE_Sodium_Core32_Int64 $h3
+         * @var ParagonIE_Sodium_Core32_Int64 $h4
+         * @var ParagonIE_Sodium_Core32_Int64 $h5
+         * @var ParagonIE_Sodium_Core32_Int64 $h6
+         * @var ParagonIE_Sodium_Core32_Int64 $h7
+         * @var ParagonIE_Sodium_Core32_Int64 $h8
+         * @var ParagonIE_Sodium_Core32_Int64 $h9
+         */
+
+        $carry0 = $h0->addInt(1 << 25)->shiftRight(26);
+        $h1 = $h1->addInt64($carry0);
+        $h0 = $h0->subInt64($carry0->shiftLeft(26));
+
+        $carry4 = $h4->addInt(1 << 25)->shiftRight(26);
+        $h5 = $h5->addInt64($carry4);
+        $h4 = $h4->subInt64($carry4->shiftLeft(26));
+
+        $carry1 = $h1->addInt(1 << 24)->shiftRight(25);
+        $h2 = $h2->addInt64($carry1);
+        $h1 = $h1->subInt64($carry1->shiftLeft(25));
+
+        $carry5 = $h5->addInt(1 << 24)->shiftRight(25);
+        $h6 = $h6->addInt64($carry5);
+        $h5 = $h5->subInt64($carry5->shiftLeft(25));
+
+        $carry2 = $h2->addInt(1 << 25)->shiftRight(26);
+        $h3 = $h3->addInt64($carry2);
+        $h2 = $h2->subInt64($carry2->shiftLeft(26));
+
+        $carry6 = $h6->addInt(1 << 25)->shiftRight(26);
+        $h7 = $h7->addInt64($carry6);
+        $h6 = $h6->subInt64($carry6->shiftLeft(26));
+
+        $carry3 = $h3->addInt(1 << 24)->shiftRight(25);
+        $h4 = $h4->addInt64($carry3);
+        $h3 = $h3->subInt64($carry3->shiftLeft(25));
+
+        $carry7 = $h7->addInt(1 << 24)->shiftRight(25);
+        $h8 = $h8->addInt64($carry7);
+        $h7 = $h7->subInt64($carry7->shiftLeft(25));
+
+        $carry4 = $h4->addInt(1 << 25)->shiftRight(26);
+        $h5 = $h5->addInt64($carry4);
+        $h4 = $h4->subInt64($carry4->shiftLeft(26));
+
+        $carry8 = $h8->addInt(1 << 25)->shiftRight(26);
+        $h9 = $h9->addInt64($carry8);
+        $h8 = $h8->subInt64($carry8->shiftLeft(26));
+
+        $carry9 = $h9->addInt(1 << 24)->shiftRight(25);
+        $h0 = $h0->addInt64($carry9->mulInt(19, 5));
+        $h9 = $h9->subInt64($carry9->shiftLeft(25));
+
+        $carry0 = $h0->addInt(1 << 25)->shiftRight(26);
+        $h1 = $h1->addInt64($carry0);
+        $h0 = $h0->subInt64($carry0->shiftLeft(26));
+
+        return ParagonIE_Sodium_Core32_Curve25519_Fe::fromArray(
+            array(
+                $h0->toInt32(),
+                $h1->toInt32(),
+                $h2->toInt32(),
+                $h3->toInt32(),
+                $h4->toInt32(),
+                $h5->toInt32(),
+                $h6->toInt32(),
+                $h7->toInt32(),
+                $h8->toInt32(),
+                $h9->toInt32()
+            )
+        );
+    }
+
+    /**
+     * Square and double a field element
+     *
+     * h = 2 * f * f
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe $f
+     * @return ParagonIE_Sodium_Core32_Curve25519_Fe
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedMethodCall
+     */
+    public static function fe_sq2(ParagonIE_Sodium_Core32_Curve25519_Fe $f)
+    {
+        /** @var ParagonIE_Sodium_Core32_Int64 $f0 */
+        $f0 = $f[0]->toInt64();
+        /** @var ParagonIE_Sodium_Core32_Int64 $f1 */
+        $f1 = $f[1]->toInt64();
+        /** @var ParagonIE_Sodium_Core32_Int64 $f2 */
+        $f2 = $f[2]->toInt64();
+        /** @var ParagonIE_Sodium_Core32_Int64 $f3 */
+        $f3 = $f[3]->toInt64();
+        /** @var ParagonIE_Sodium_Core32_Int64 $f4 */
+        $f4 = $f[4]->toInt64();
+        /** @var ParagonIE_Sodium_Core32_Int64 $f5 */
+        $f5 = $f[5]->toInt64();
+        /** @var ParagonIE_Sodium_Core32_Int64 $f6 */
+        $f6 = $f[6]->toInt64();
+        /** @var ParagonIE_Sodium_Core32_Int64 $f7 */
+        $f7 = $f[7]->toInt64();
+        /** @var ParagonIE_Sodium_Core32_Int64 $f8 */
+        $f8 = $f[8]->toInt64();
+        /** @var ParagonIE_Sodium_Core32_Int64 $f9 */
+        $f9 = $f[9]->toInt64();
+
+        $f0_2 = $f0->shiftLeft(1);
+        $f1_2 = $f1->shiftLeft(1);
+        $f2_2 = $f2->shiftLeft(1);
+        $f3_2 = $f3->shiftLeft(1);
+        $f4_2 = $f4->shiftLeft(1);
+        $f5_2 = $f5->shiftLeft(1);
+        $f6_2 = $f6->shiftLeft(1);
+        $f7_2 = $f7->shiftLeft(1);
+        $f5_38 = $f5->mulInt(38, 6); /* 1.959375*2^30 */
+        $f6_19 = $f6->mulInt(19, 5); /* 1.959375*2^30 */
+        $f7_38 = $f7->mulInt(38, 6); /* 1.959375*2^30 */
+        $f8_19 = $f8->mulInt(19, 5); /* 1.959375*2^30 */
+        $f9_38 = $f9->mulInt(38, 6); /* 1.959375*2^30 */
+        $f0f0 = $f0->mulInt64($f0, 28);
+        $f0f1_2 = $f0_2->mulInt64($f1, 28);
+        $f0f2_2 = $f0_2->mulInt64($f2, 28);
+        $f0f3_2 = $f0_2->mulInt64($f3, 28);
+        $f0f4_2 = $f0_2->mulInt64($f4, 28);
+        $f0f5_2 = $f0_2->mulInt64($f5, 28);
+        $f0f6_2 = $f0_2->mulInt64($f6, 28);
+        $f0f7_2 = $f0_2->mulInt64($f7, 28);
+        $f0f8_2 = $f0_2->mulInt64($f8, 28);
+        $f0f9_2 = $f0_2->mulInt64($f9, 28);
+        $f1f1_2 = $f1_2->mulInt64($f1, 28);
+        $f1f2_2 = $f1_2->mulInt64($f2, 28);
+        $f1f3_4 = $f1_2->mulInt64($f3_2, 29);
+        $f1f4_2 = $f1_2->mulInt64($f4, 28);
+        $f1f5_4 = $f1_2->mulInt64($f5_2, 29);
+        $f1f6_2 = $f1_2->mulInt64($f6, 28);
+        $f1f7_4 = $f1_2->mulInt64($f7_2, 29);
+        $f1f8_2 = $f1_2->mulInt64($f8, 28);
+        $f1f9_76 = $f9_38->mulInt64($f1_2, 29);
+        $f2f2 = $f2->mulInt64($f2, 28);
+        $f2f3_2 = $f2_2->mulInt64($f3, 28);
+        $f2f4_2 = $f2_2->mulInt64($f4, 28);
+        $f2f5_2 = $f2_2->mulInt64($f5, 28);
+        $f2f6_2 = $f2_2->mulInt64($f6, 28);
+        $f2f7_2 = $f2_2->mulInt64($f7, 28);
+        $f2f8_38 = $f8_19->mulInt64($f2_2, 29);
+        $f2f9_38 = $f9_38->mulInt64($f2, 29);
+        $f3f3_2 = $f3_2->mulInt64($f3, 28);
+        $f3f4_2 = $f3_2->mulInt64($f4, 28);
+        $f3f5_4 = $f3_2->mulInt64($f5_2, 28);
+        $f3f6_2 = $f3_2->mulInt64($f6, 28);
+        $f3f7_76 = $f7_38->mulInt64($f3_2, 29);
+        $f3f8_38 = $f8_19->mulInt64($f3_2, 29);
+        $f3f9_76 = $f9_38->mulInt64($f3_2, 29);
+        $f4f4 = $f4->mulInt64($f4, 28);
+        $f4f5_2 = $f4_2->mulInt64($f5, 28);
+        $f4f6_38 = $f6_19->mulInt64($f4_2, 29);
+        $f4f7_38 = $f7_38->mulInt64($f4, 29);
+        $f4f8_38 = $f8_19->mulInt64($f4_2, 29);
+        $f4f9_38 = $f9_38->mulInt64($f4, 29);
+        $f5f5_38 = $f5_38->mulInt64($f5, 29);
+        $f5f6_38 = $f6_19->mulInt64($f5_2, 29);
+        $f5f7_76 = $f7_38->mulInt64($f5_2, 29);
+        $f5f8_38 = $f8_19->mulInt64($f5_2, 29);
+        $f5f9_76 = $f9_38->mulInt64($f5_2, 29);
+        $f6f6_19 = $f6_19->mulInt64($f6, 29);
+        $f6f7_38 = $f7_38->mulInt64($f6, 29);
+        $f6f8_38 = $f8_19->mulInt64($f6_2, 29);
+        $f6f9_38 = $f9_38->mulInt64($f6, 29);
+        $f7f7_38 = $f7_38->mulInt64($f7, 29);
+        $f7f8_38 = $f8_19->mulInt64($f7_2, 29);
+        $f7f9_76 = $f9_38->mulInt64($f7_2, 29);
+        $f8f8_19 = $f8_19->mulInt64($f8, 29);
+        $f8f9_38 = $f9_38->mulInt64($f8, 29);
+        $f9f9_38 = $f9_38->mulInt64($f9, 29);
+
+        $h0 = $f0f0->addInt64($f1f9_76)->addInt64($f2f8_38)->addInt64($f3f7_76)->addInt64($f4f6_38)->addInt64($f5f5_38);
+        $h1 = $f0f1_2->addInt64($f2f9_38)->addInt64($f3f8_38)->addInt64($f4f7_38)->addInt64($f5f6_38);
+        $h2 = $f0f2_2->addInt64($f1f1_2)->addInt64($f3f9_76)->addInt64($f4f8_38)->addInt64($f5f7_76)->addInt64($f6f6_19);
+        $h3 = $f0f3_2->addInt64($f1f2_2)->addInt64($f4f9_38)->addInt64($f5f8_38)->addInt64($f6f7_38);
+        $h4 = $f0f4_2->addInt64($f1f3_4)->addInt64($f2f2)->addInt64($f5f9_76)->addInt64($f6f8_38)->addInt64($f7f7_38);
+        $h5 = $f0f5_2->addInt64($f1f4_2)->addInt64($f2f3_2)->addInt64($f6f9_38)->addInt64($f7f8_38);
+        $h6 = $f0f6_2->addInt64($f1f5_4)->addInt64($f2f4_2)->addInt64($f3f3_2)->addInt64($f7f9_76)->addInt64($f8f8_19);
+        $h7 = $f0f7_2->addInt64($f1f6_2)->addInt64($f2f5_2)->addInt64($f3f4_2)->addInt64($f8f9_38);
+        $h8 = $f0f8_2->addInt64($f1f7_4)->addInt64($f2f6_2)->addInt64($f3f5_4)->addInt64($f4f4)->addInt64($f9f9_38);
+        $h9 = $f0f9_2->addInt64($f1f8_2)->addInt64($f2f7_2)->addInt64($f3f6_2)->addInt64($f4f5_2);
+
+        /**
+         * @var ParagonIE_Sodium_Core32_Int64 $h0
+         * @var ParagonIE_Sodium_Core32_Int64 $h1
+         * @var ParagonIE_Sodium_Core32_Int64 $h2
+         * @var ParagonIE_Sodium_Core32_Int64 $h3
+         * @var ParagonIE_Sodium_Core32_Int64 $h4
+         * @var ParagonIE_Sodium_Core32_Int64 $h5
+         * @var ParagonIE_Sodium_Core32_Int64 $h6
+         * @var ParagonIE_Sodium_Core32_Int64 $h7
+         * @var ParagonIE_Sodium_Core32_Int64 $h8
+         * @var ParagonIE_Sodium_Core32_Int64 $h9
+         */
+        $h0 = $h0->shiftLeft(1);
+        $h1 = $h1->shiftLeft(1);
+        $h2 = $h2->shiftLeft(1);
+        $h3 = $h3->shiftLeft(1);
+        $h4 = $h4->shiftLeft(1);
+        $h5 = $h5->shiftLeft(1);
+        $h6 = $h6->shiftLeft(1);
+        $h7 = $h7->shiftLeft(1);
+        $h8 = $h8->shiftLeft(1);
+        $h9 = $h9->shiftLeft(1);
+
+        $carry0 = $h0->addInt(1 << 25)->shiftRight(26);
+        $h1 = $h1->addInt64($carry0);
+        $h0 = $h0->subInt64($carry0->shiftLeft(26));
+        $carry4 = $h4->addInt(1 << 25)->shiftRight(26);
+        $h5 = $h5->addInt64($carry4);
+        $h4 = $h4->subInt64($carry4->shiftLeft(26));
+
+        $carry1 = $h1->addInt(1 << 24)->shiftRight(25);
+        $h2 = $h2->addInt64($carry1);
+        $h1 = $h1->subInt64($carry1->shiftLeft(25));
+        $carry5 = $h5->addInt(1 << 24)->shiftRight(25);
+        $h6 = $h6->addInt64($carry5);
+        $h5 = $h5->subInt64($carry5->shiftLeft(25));
+
+        $carry2 = $h2->addInt(1 << 25)->shiftRight(26);
+        $h3 = $h3->addInt64($carry2);
+        $h2 = $h2->subInt64($carry2->shiftLeft(26));
+        $carry6 = $h6->addInt(1 << 25)->shiftRight(26);
+        $h7 = $h7->addInt64($carry6);
+        $h6 = $h6->subInt64($carry6->shiftLeft(26));
+
+        $carry3 = $h3->addInt(1 << 24)->shiftRight(25);
+        $h4 = $h4->addInt64($carry3);
+        $h3 = $h3->subInt64($carry3->shiftLeft(25));
+        $carry7 = $h7->addInt(1 << 24)->shiftRight(25);
+        $h8 = $h8->addInt64($carry7);
+        $h7 = $h7->subInt64($carry7->shiftLeft(25));
+
+        $carry4 = $h4->addInt(1 << 25)->shiftRight(26);
+        $h5 = $h5->addInt64($carry4);
+        $h4 = $h4->subInt64($carry4->shiftLeft(26));
+        $carry8 = $h8->addInt(1 << 25)->shiftRight(26);
+        $h9 = $h9->addInt64($carry8);
+        $h8 = $h8->subInt64($carry8->shiftLeft(26));
+
+        $carry9 = $h9->addInt(1 << 24)->shiftRight(25);
+        $h0 = $h0->addInt64($carry9->mulInt(19, 5));
+        $h9 = $h9->subInt64($carry9->shiftLeft(25));
+
+        $carry0 = $h0->addInt(1 << 25)->shiftRight(26);
+        $h1 = $h1->addInt64($carry0);
+        $h0 = $h0->subInt64($carry0->shiftLeft(26));
+
+        return ParagonIE_Sodium_Core32_Curve25519_Fe::fromArray(
+            array(
+                $h0->toInt32(),
+                $h1->toInt32(),
+                $h2->toInt32(),
+                $h3->toInt32(),
+                $h4->toInt32(),
+                $h5->toInt32(),
+                $h6->toInt32(),
+                $h7->toInt32(),
+                $h8->toInt32(),
+                $h9->toInt32()
+            )
+        );
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe $Z
+     * @return ParagonIE_Sodium_Core32_Curve25519_Fe
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function fe_invert(ParagonIE_Sodium_Core32_Curve25519_Fe $Z)
+    {
+        $z = clone $Z;
+        $t0 = self::fe_sq($z);
+        $t1 = self::fe_sq($t0);
+        $t1 = self::fe_sq($t1);
+        $t1 = self::fe_mul($z, $t1);
+        $t0 = self::fe_mul($t0, $t1);
+        $t2 = self::fe_sq($t0);
+        $t1 = self::fe_mul($t1, $t2);
+        $t2 = self::fe_sq($t1);
+        for ($i = 1; $i < 5; ++$i) {
+            $t2 = self::fe_sq($t2);
+        }
+        $t1 = self::fe_mul($t2, $t1);
+        $t2 = self::fe_sq($t1);
+        for ($i = 1; $i < 10; ++$i) {
+            $t2 = self::fe_sq($t2);
+        }
+        $t2 = self::fe_mul($t2, $t1);
+        $t3 = self::fe_sq($t2);
+        for ($i = 1; $i < 20; ++$i) {
+            $t3 = self::fe_sq($t3);
+        }
+        $t2 = self::fe_mul($t3, $t2);
+        $t2 = self::fe_sq($t2);
+        for ($i = 1; $i < 10; ++$i) {
+            $t2 = self::fe_sq($t2);
+        }
+        $t1 = self::fe_mul($t2, $t1);
+        $t2 = self::fe_sq($t1);
+        for ($i = 1; $i < 50; ++$i) {
+            $t2 = self::fe_sq($t2);
+        }
+        $t2 = self::fe_mul($t2, $t1);
+        $t3 = self::fe_sq($t2);
+        for ($i = 1; $i < 100; ++$i) {
+            $t3 = self::fe_sq($t3);
+        }
+        $t2 = self::fe_mul($t3, $t2);
+        $t2 = self::fe_sq($t2);
+        for ($i = 1; $i < 50; ++$i) {
+            $t2 = self::fe_sq($t2);
+        }
+        $t1 = self::fe_mul($t2, $t1);
+        $t1 = self::fe_sq($t1);
+        for ($i = 1; $i < 5; ++$i) {
+            $t1 = self::fe_sq($t1);
+        }
+        return self::fe_mul($t1, $t0);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @ref https://github.com/jedisct1/libsodium/blob/68564326e1e9dc57ef03746f85734232d20ca6fb/src/libsodium/crypto_core/curve25519/ref10/curve25519_ref10.c#L1054-L1106
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe $z
+     * @return ParagonIE_Sodium_Core32_Curve25519_Fe
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function fe_pow22523(ParagonIE_Sodium_Core32_Curve25519_Fe $z)
+    {
+        # fe_sq(t0, z);
+        # fe_sq(t1, t0);
+        # fe_sq(t1, t1);
+        # fe_mul(t1, z, t1);
+        # fe_mul(t0, t0, t1);
+        # fe_sq(t0, t0);
+        # fe_mul(t0, t1, t0);
+        # fe_sq(t1, t0);
+        $t0 = self::fe_sq($z);
+        $t1 = self::fe_sq($t0);
+        $t1 = self::fe_sq($t1);
+        $t1 = self::fe_mul($z, $t1);
+        $t0 = self::fe_mul($t0, $t1);
+        $t0 = self::fe_sq($t0);
+        $t0 = self::fe_mul($t1, $t0);
+        $t1 = self::fe_sq($t0);
+
+        # for (i = 1; i < 5; ++i) {
+        #     fe_sq(t1, t1);
+        # }
+        for ($i = 1; $i < 5; ++$i) {
+            $t1 = self::fe_sq($t1);
+        }
+
+        # fe_mul(t0, t1, t0);
+        # fe_sq(t1, t0);
+        $t0 = self::fe_mul($t1, $t0);
+        $t1 = self::fe_sq($t0);
+
+        # for (i = 1; i < 10; ++i) {
+        #     fe_sq(t1, t1);
+        # }
+        for ($i = 1; $i < 10; ++$i) {
+            $t1 = self::fe_sq($t1);
+        }
+
+        # fe_mul(t1, t1, t0);
+        # fe_sq(t2, t1);
+        $t1 = self::fe_mul($t1, $t0);
+        $t2 = self::fe_sq($t1);
+
+        # for (i = 1; i < 20; ++i) {
+        #     fe_sq(t2, t2);
+        # }
+        for ($i = 1; $i < 20; ++$i) {
+            $t2 = self::fe_sq($t2);
+        }
+
+        # fe_mul(t1, t2, t1);
+        # fe_sq(t1, t1);
+        $t1 = self::fe_mul($t2, $t1);
+        $t1 = self::fe_sq($t1);
+
+        # for (i = 1; i < 10; ++i) {
+        #     fe_sq(t1, t1);
+        # }
+        for ($i = 1; $i < 10; ++$i) {
+            $t1 = self::fe_sq($t1);
+        }
+
+        # fe_mul(t0, t1, t0);
+        # fe_sq(t1, t0);
+        $t0 = self::fe_mul($t1, $t0);
+        $t1 = self::fe_sq($t0);
+
+        # for (i = 1; i < 50; ++i) {
+        #     fe_sq(t1, t1);
+        # }
+        for ($i = 1; $i < 50; ++$i) {
+            $t1 = self::fe_sq($t1);
+        }
+
+        # fe_mul(t1, t1, t0);
+        # fe_sq(t2, t1);
+        $t1 = self::fe_mul($t1, $t0);
+        $t2 = self::fe_sq($t1);
+
+        # for (i = 1; i < 100; ++i) {
+        #     fe_sq(t2, t2);
+        # }
+        for ($i = 1; $i < 100; ++$i) {
+            $t2 = self::fe_sq($t2);
+        }
+
+        # fe_mul(t1, t2, t1);
+        # fe_sq(t1, t1);
+        $t1 = self::fe_mul($t2, $t1);
+        $t1 = self::fe_sq($t1);
+
+        # for (i = 1; i < 50; ++i) {
+        #     fe_sq(t1, t1);
+        # }
+        for ($i = 1; $i < 50; ++$i) {
+            $t1 = self::fe_sq($t1);
+        }
+
+        # fe_mul(t0, t1, t0);
+        # fe_sq(t0, t0);
+        # fe_sq(t0, t0);
+        # fe_mul(out, t0, z);
+        $t0 = self::fe_mul($t1, $t0);
+        $t0 = self::fe_sq($t0);
+        $t0 = self::fe_sq($t0);
+        return self::fe_mul($t0, $z);
+    }
+
+    /**
+     * Subtract two field elements.
+     *
+     * h = f - g
+     *
+     * Preconditions:
+     * |f| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
+     * |g| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
+     *
+     * Postconditions:
+     * |h| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe $f
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe $g
+     * @return ParagonIE_Sodium_Core32_Curve25519_Fe
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedMethodCall
+     * @psalm-suppress MixedTypeCoercion
+     */
+    public static function fe_sub(ParagonIE_Sodium_Core32_Curve25519_Fe $f, ParagonIE_Sodium_Core32_Curve25519_Fe $g)
+    {
+        return ParagonIE_Sodium_Core32_Curve25519_Fe::fromArray(
+            array(
+                $f[0]->subInt32($g[0]),
+                $f[1]->subInt32($g[1]),
+                $f[2]->subInt32($g[2]),
+                $f[3]->subInt32($g[3]),
+                $f[4]->subInt32($g[4]),
+                $f[5]->subInt32($g[5]),
+                $f[6]->subInt32($g[6]),
+                $f[7]->subInt32($g[7]),
+                $f[8]->subInt32($g[8]),
+                $f[9]->subInt32($g[9])
+            )
+        );
+    }
+
+    /**
+     * Add two group elements.
+     *
+     * r = p + q
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Ge_P3 $p
+     * @param ParagonIE_Sodium_Core32_Curve25519_Ge_Cached $q
+     * @return ParagonIE_Sodium_Core32_Curve25519_Ge_P1p1
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function ge_add(
+        ParagonIE_Sodium_Core32_Curve25519_Ge_P3 $p,
+        ParagonIE_Sodium_Core32_Curve25519_Ge_Cached $q
+    ) {
+        $r = new ParagonIE_Sodium_Core32_Curve25519_Ge_P1p1();
+        $r->X = self::fe_add($p->Y, $p->X);
+        $r->Y = self::fe_sub($p->Y, $p->X);
+        $r->Z = self::fe_mul($r->X, $q->YplusX);
+        $r->Y = self::fe_mul($r->Y, $q->YminusX);
+        $r->T = self::fe_mul($q->T2d, $p->T);
+        $r->X = self::fe_mul($p->Z, $q->Z);
+        $t0   = self::fe_add($r->X, $r->X);
+        $r->X = self::fe_sub($r->Z, $r->Y);
+        $r->Y = self::fe_add($r->Z, $r->Y);
+        $r->Z = self::fe_add($t0, $r->T);
+        $r->T = self::fe_sub($t0, $r->T);
+        return $r;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @ref https://github.com/jedisct1/libsodium/blob/157c4a80c13b117608aeae12178b2d38825f9f8f/src/libsodium/crypto_core/curve25519/ref10/curve25519_ref10.c#L1185-L1215
+     * @param string $a
+     * @return array<int, mixed>
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArrayOffset
+     */
+    public static function slide($a)
+    {
+        if (self::strlen($a) < 256) {
+            if (self::strlen($a) < 16) {
+                $a = str_pad($a, 256, '0', STR_PAD_RIGHT);
+            }
+        }
+        /** @var array<int, int> $r */
+        $r = array();
+        for ($i = 0; $i < 256; ++$i) {
+            $r[$i] = (int) (1 &
+                (
+                    self::chrToInt($a[$i >> 3])
+                        >>
+                    ($i & 7)
+                )
+            );
+        }
+
+        for ($i = 0;$i < 256;++$i) {
+            if ($r[$i]) {
+                for ($b = 1;$b <= 6 && $i + $b < 256;++$b) {
+                    if ($r[$i + $b]) {
+                        if ($r[$i] + ($r[$i + $b] << $b) <= 15) {
+                            $r[$i] += $r[$i + $b] << $b;
+                            $r[$i + $b] = 0;
+                        } elseif ($r[$i] - ($r[$i + $b] << $b) >= -15) {
+                            $r[$i] -= $r[$i + $b] << $b;
+                            for ($k = $i + $b; $k < 256; ++$k) {
+                                if (!$r[$k]) {
+                                    $r[$k] = 1;
+                                    break;
+                                }
+                                $r[$k] = 0;
+                            }
+                        } else {
+                            break;
+                        }
+                    }
+                }
+            }
+        }
+        return $r;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $s
+     * @return ParagonIE_Sodium_Core32_Curve25519_Ge_P3
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function ge_frombytes_negate_vartime($s)
+    {
+        static $d = null;
+        if (!$d) {
+            /** @var ParagonIE_Sodium_Core32_Curve25519_Fe $d */
+            $d = ParagonIE_Sodium_Core32_Curve25519_Fe::fromArray(
+                array(
+                    ParagonIE_Sodium_Core32_Int32::fromInt(self::$d[0]),
+                    ParagonIE_Sodium_Core32_Int32::fromInt(self::$d[1]),
+                    ParagonIE_Sodium_Core32_Int32::fromInt(self::$d[2]),
+                    ParagonIE_Sodium_Core32_Int32::fromInt(self::$d[3]),
+                    ParagonIE_Sodium_Core32_Int32::fromInt(self::$d[4]),
+                    ParagonIE_Sodium_Core32_Int32::fromInt(self::$d[5]),
+                    ParagonIE_Sodium_Core32_Int32::fromInt(self::$d[6]),
+                    ParagonIE_Sodium_Core32_Int32::fromInt(self::$d[7]),
+                    ParagonIE_Sodium_Core32_Int32::fromInt(self::$d[8]),
+                    ParagonIE_Sodium_Core32_Int32::fromInt(self::$d[9])
+                )
+            );
+        }
+
+        # fe_frombytes(h->Y,s);
+        # fe_1(h->Z);
+        $h = new ParagonIE_Sodium_Core32_Curve25519_Ge_P3(
+            self::fe_0(),
+            self::fe_frombytes($s),
+            self::fe_1()
+        );
+
+        # fe_sq(u,h->Y);
+        # fe_mul(v,u,d);
+        # fe_sub(u,u,h->Z);       /* u = y^2-1 */
+        # fe_add(v,v,h->Z);       /* v = dy^2+1 */
+        $u = self::fe_sq($h->Y);
+        /** @var ParagonIE_Sodium_Core32_Curve25519_Fe $d */
+        $v = self::fe_mul($u, $d);
+        $u = self::fe_sub($u, $h->Z); /* u =  y^2 - 1 */
+        $v = self::fe_add($v, $h->Z); /* v = dy^2 + 1 */
+
+        # fe_sq(v3,v);
+        # fe_mul(v3,v3,v);        /* v3 = v^3 */
+        # fe_sq(h->X,v3);
+        # fe_mul(h->X,h->X,v);
+        # fe_mul(h->X,h->X,u);    /* x = uv^7 */
+        $v3 = self::fe_sq($v);
+        $v3 = self::fe_mul($v3, $v); /* v3 = v^3 */
+        $h->X = self::fe_sq($v3);
+        $h->X = self::fe_mul($h->X, $v);
+        $h->X = self::fe_mul($h->X, $u); /* x = uv^7 */
+
+        # fe_pow22523(h->X,h->X); /* x = (uv^7)^((q-5)/8) */
+        # fe_mul(h->X,h->X,v3);
+        # fe_mul(h->X,h->X,u);    /* x = uv^3(uv^7)^((q-5)/8) */
+        $h->X = self::fe_pow22523($h->X); /* x = (uv^7)^((q-5)/8) */
+        $h->X = self::fe_mul($h->X, $v3);
+        $h->X = self::fe_mul($h->X, $u); /* x = uv^3(uv^7)^((q-5)/8) */
+
+        # fe_sq(vxx,h->X);
+        # fe_mul(vxx,vxx,v);
+        # fe_sub(check,vxx,u);    /* vx^2-u */
+        $vxx = self::fe_sq($h->X);
+        $vxx = self::fe_mul($vxx, $v);
+        $check = self::fe_sub($vxx, $u); /* vx^2 - u */
+
+        # if (fe_isnonzero(check)) {
+        #     fe_add(check,vxx,u);  /* vx^2+u */
+        #     if (fe_isnonzero(check)) {
+        #         return -1;
+        #     }
+        #     fe_mul(h->X,h->X,sqrtm1);
+        # }
+        if (self::fe_isnonzero($check)) {
+            $check = self::fe_add($vxx, $u); /* vx^2 + u */
+            if (self::fe_isnonzero($check)) {
+                throw new RangeException('Internal check failed.');
+            }
+            $h->X = self::fe_mul(
+                $h->X,
+                ParagonIE_Sodium_Core32_Curve25519_Fe::fromIntArray(self::$sqrtm1)
+            );
+        }
+
+        # if (fe_isnegative(h->X) == (s[31] >> 7)) {
+        #     fe_neg(h->X,h->X);
+        # }
+        $i = self::chrToInt($s[31]);
+        if (self::fe_isnegative($h->X) === ($i >> 7)) {
+            $h->X = self::fe_neg($h->X);
+        }
+
+        # fe_mul(h->T,h->X,h->Y);
+        $h->T = self::fe_mul($h->X, $h->Y);
+        return $h;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Ge_P1p1 $R
+     * @param ParagonIE_Sodium_Core32_Curve25519_Ge_P3 $p
+     * @param ParagonIE_Sodium_Core32_Curve25519_Ge_Precomp $q
+     * @return ParagonIE_Sodium_Core32_Curve25519_Ge_P1p1
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function ge_madd(
+        ParagonIE_Sodium_Core32_Curve25519_Ge_P1p1 $R,
+        ParagonIE_Sodium_Core32_Curve25519_Ge_P3 $p,
+        ParagonIE_Sodium_Core32_Curve25519_Ge_Precomp $q
+    ) {
+        $r = clone $R;
+        $r->X = self::fe_add($p->Y, $p->X);
+        $r->Y = self::fe_sub($p->Y, $p->X);
+        $r->Z = self::fe_mul($r->X, $q->yplusx);
+        $r->Y = self::fe_mul($r->Y, $q->yminusx);
+        $r->T = self::fe_mul($q->xy2d, $p->T);
+        $t0 = self::fe_add(clone $p->Z, clone $p->Z);
+        $r->X = self::fe_sub($r->Z, $r->Y);
+        $r->Y = self::fe_add($r->Z, $r->Y);
+        $r->Z = self::fe_add($t0, $r->T);
+        $r->T = self::fe_sub($t0, $r->T);
+
+        return $r;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Ge_P1p1 $R
+     * @param ParagonIE_Sodium_Core32_Curve25519_Ge_P3 $p
+     * @param ParagonIE_Sodium_Core32_Curve25519_Ge_Precomp $q
+     * @return ParagonIE_Sodium_Core32_Curve25519_Ge_P1p1
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function ge_msub(
+        ParagonIE_Sodium_Core32_Curve25519_Ge_P1p1 $R,
+        ParagonIE_Sodium_Core32_Curve25519_Ge_P3 $p,
+        ParagonIE_Sodium_Core32_Curve25519_Ge_Precomp $q
+    ) {
+        $r = clone $R;
+
+        $r->X = self::fe_add($p->Y, $p->X);
+        $r->Y = self::fe_sub($p->Y, $p->X);
+        $r->Z = self::fe_mul($r->X, $q->yminusx);
+        $r->Y = self::fe_mul($r->Y, $q->yplusx);
+        $r->T = self::fe_mul($q->xy2d, $p->T);
+        $t0 = self::fe_add($p->Z, $p->Z);
+        $r->X = self::fe_sub($r->Z, $r->Y);
+        $r->Y = self::fe_add($r->Z, $r->Y);
+        $r->Z = self::fe_sub($t0, $r->T);
+        $r->T = self::fe_add($t0, $r->T);
+
+        return $r;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Ge_P1p1 $p
+     * @return ParagonIE_Sodium_Core32_Curve25519_Ge_P2
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function ge_p1p1_to_p2(ParagonIE_Sodium_Core32_Curve25519_Ge_P1p1 $p)
+    {
+        $r = new ParagonIE_Sodium_Core32_Curve25519_Ge_P2();
+        $r->X = self::fe_mul($p->X, $p->T);
+        $r->Y = self::fe_mul($p->Y, $p->Z);
+        $r->Z = self::fe_mul($p->Z, $p->T);
+        return $r;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Ge_P1p1 $p
+     * @return ParagonIE_Sodium_Core32_Curve25519_Ge_P3
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function ge_p1p1_to_p3(ParagonIE_Sodium_Core32_Curve25519_Ge_P1p1 $p)
+    {
+        $r = new ParagonIE_Sodium_Core32_Curve25519_Ge_P3();
+        $r->X = self::fe_mul($p->X, $p->T);
+        $r->Y = self::fe_mul($p->Y, $p->Z);
+        $r->Z = self::fe_mul($p->Z, $p->T);
+        $r->T = self::fe_mul($p->X, $p->Y);
+        return $r;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @return ParagonIE_Sodium_Core32_Curve25519_Ge_P2
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function ge_p2_0()
+    {
+        return new ParagonIE_Sodium_Core32_Curve25519_Ge_P2(
+            self::fe_0(),
+            self::fe_1(),
+            self::fe_1()
+        );
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Ge_P2 $p
+     * @return ParagonIE_Sodium_Core32_Curve25519_Ge_P1p1
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function ge_p2_dbl(ParagonIE_Sodium_Core32_Curve25519_Ge_P2 $p)
+    {
+        $r = new ParagonIE_Sodium_Core32_Curve25519_Ge_P1p1();
+
+        $r->X = self::fe_sq($p->X);
+        $r->Z = self::fe_sq($p->Y);
+        $r->T = self::fe_sq2($p->Z);
+        $r->Y = self::fe_add($p->X, $p->Y);
+        $t0   = self::fe_sq($r->Y);
+        $r->Y = self::fe_add($r->Z, $r->X);
+        $r->Z = self::fe_sub($r->Z, $r->X);
+        $r->X = self::fe_sub($t0, $r->Y);
+        $r->T = self::fe_sub($r->T, $r->Z);
+
+        return $r;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @return ParagonIE_Sodium_Core32_Curve25519_Ge_P3
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function ge_p3_0()
+    {
+        return new ParagonIE_Sodium_Core32_Curve25519_Ge_P3(
+            self::fe_0(),
+            self::fe_1(),
+            self::fe_1(),
+            self::fe_0()
+        );
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Ge_P3 $p
+     * @return ParagonIE_Sodium_Core32_Curve25519_Ge_Cached
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function ge_p3_to_cached(ParagonIE_Sodium_Core32_Curve25519_Ge_P3 $p)
+    {
+        static $d2 = null;
+        if ($d2 === null) {
+            $d2 = ParagonIE_Sodium_Core32_Curve25519_Fe::fromArray(
+                array(
+                    ParagonIE_Sodium_Core32_Int32::fromInt(self::$d2[0]),
+                    ParagonIE_Sodium_Core32_Int32::fromInt(self::$d2[1]),
+                    ParagonIE_Sodium_Core32_Int32::fromInt(self::$d2[2]),
+                    ParagonIE_Sodium_Core32_Int32::fromInt(self::$d2[3]),
+                    ParagonIE_Sodium_Core32_Int32::fromInt(self::$d2[4]),
+                    ParagonIE_Sodium_Core32_Int32::fromInt(self::$d2[5]),
+                    ParagonIE_Sodium_Core32_Int32::fromInt(self::$d2[6]),
+                    ParagonIE_Sodium_Core32_Int32::fromInt(self::$d2[7]),
+                    ParagonIE_Sodium_Core32_Int32::fromInt(self::$d2[8]),
+                    ParagonIE_Sodium_Core32_Int32::fromInt(self::$d2[9])
+                )
+            );
+        }
+        /** @var ParagonIE_Sodium_Core32_Curve25519_Fe $d2 */
+        $r = new ParagonIE_Sodium_Core32_Curve25519_Ge_Cached();
+        $r->YplusX = self::fe_add($p->Y, $p->X);
+        $r->YminusX = self::fe_sub($p->Y, $p->X);
+        $r->Z = self::fe_copy($p->Z);
+        $r->T2d = self::fe_mul($p->T, $d2);
+        return $r;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Ge_P3 $p
+     * @return ParagonIE_Sodium_Core32_Curve25519_Ge_P2
+     */
+    public static function ge_p3_to_p2(ParagonIE_Sodium_Core32_Curve25519_Ge_P3 $p)
+    {
+        return new ParagonIE_Sodium_Core32_Curve25519_Ge_P2(
+            $p->X,
+            $p->Y,
+            $p->Z
+        );
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Ge_P3 $h
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function ge_p3_tobytes(ParagonIE_Sodium_Core32_Curve25519_Ge_P3 $h)
+    {
+        $recip = self::fe_invert($h->Z);
+        $x = self::fe_mul($h->X, $recip);
+        $y = self::fe_mul($h->Y, $recip);
+        $s = self::fe_tobytes($y);
+        $s[31] = self::intToChr(
+            self::chrToInt($s[31]) ^ (self::fe_isnegative($x) << 7)
+        );
+        return $s;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Ge_P3 $p
+     * @return ParagonIE_Sodium_Core32_Curve25519_Ge_P1p1
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function ge_p3_dbl(ParagonIE_Sodium_Core32_Curve25519_Ge_P3 $p)
+    {
+        $q = self::ge_p3_to_p2($p);
+        return self::ge_p2_dbl($q);
+    }
+
+    /**
+     * @return ParagonIE_Sodium_Core32_Curve25519_Ge_Precomp
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function ge_precomp_0()
+    {
+        return new ParagonIE_Sodium_Core32_Curve25519_Ge_Precomp(
+            self::fe_1(),
+            self::fe_1(),
+            self::fe_0()
+        );
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param int $b
+     * @param int $c
+     * @return int
+     * @psalm-suppress MixedReturnStatement
+     */
+    public static function equal($b, $c)
+    {
+        return (int) ((($b ^ $c) - 1 & 0xffffffff) >> 31);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string|int $char
+     * @return int (1 = yes, 0 = no)
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function negative($char)
+    {
+        if (is_int($char)) {
+            return $char < 0 ? 1 : 0;
+        }
+        /** @var string $char */
+        /** @var int $x */
+        $x = self::chrToInt(self::substr($char, 0, 1));
+        return (int) ($x >> 31);
+    }
+
+    /**
+     * Conditional move
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Ge_Precomp $t
+     * @param ParagonIE_Sodium_Core32_Curve25519_Ge_Precomp $u
+     * @param int $b
+     * @return ParagonIE_Sodium_Core32_Curve25519_Ge_Precomp
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function cmov(
+        ParagonIE_Sodium_Core32_Curve25519_Ge_Precomp $t,
+        ParagonIE_Sodium_Core32_Curve25519_Ge_Precomp $u,
+        $b
+    ) {
+        if (!is_int($b)) {
+            throw new InvalidArgumentException('Expected an integer.');
+        }
+        return new ParagonIE_Sodium_Core32_Curve25519_Ge_Precomp(
+            self::fe_cmov($t->yplusx, $u->yplusx, $b),
+            self::fe_cmov($t->yminusx, $u->yminusx, $b),
+            self::fe_cmov($t->xy2d, $u->xy2d, $b)
+        );
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param int $pos
+     * @param int $b
+     * @return ParagonIE_Sodium_Core32_Curve25519_Ge_Precomp
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArrayAccess
+     * @psalm-suppress MixedArrayOffset
+     * @psalm-suppress MixedArgument
+     */
+    public static function ge_select($pos = 0, $b = 0)
+    {
+        static $base = null;
+        if ($base === null) {
+            $base = array();
+            foreach (self::$base as $i => $bas) {
+                for ($j = 0; $j < 8; ++$j) {
+                    $base[$i][$j] = new ParagonIE_Sodium_Core32_Curve25519_Ge_Precomp(
+                        ParagonIE_Sodium_Core32_Curve25519_Fe::fromArray(
+                            array(
+                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][0][0]),
+                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][0][1]),
+                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][0][2]),
+                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][0][3]),
+                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][0][4]),
+                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][0][5]),
+                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][0][6]),
+                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][0][7]),
+                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][0][8]),
+                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][0][9])
+                            )
+                        ),
+                        ParagonIE_Sodium_Core32_Curve25519_Fe::fromArray(
+                            array(
+                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][1][0]),
+                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][1][1]),
+                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][1][2]),
+                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][1][3]),
+                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][1][4]),
+                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][1][5]),
+                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][1][6]),
+                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][1][7]),
+                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][1][8]),
+                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][1][9])
+                            )
+                        ),
+                        ParagonIE_Sodium_Core32_Curve25519_Fe::fromArray(
+                            array(
+                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][2][0]),
+                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][2][1]),
+                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][2][2]),
+                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][2][3]),
+                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][2][4]),
+                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][2][5]),
+                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][2][6]),
+                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][2][7]),
+                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][2][8]),
+                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][2][9])
+                            )
+                        )
+                    );
+                }
+            }
+        }
+        if (!is_int($pos)) {
+            throw new InvalidArgumentException('Position must be an integer');
+        }
+        if ($pos < 0 || $pos > 31) {
+            throw new RangeException('Position is out of range [0, 31]');
+        }
+
+        $bnegative = self::negative($b);
+        /** @var int $babs */
+        $babs = $b - (((-$bnegative) & $b) << 1);
+
+        $t = self::ge_precomp_0();
+        for ($i = 0; $i < 8; ++$i) {
+            $t = self::cmov(
+                $t,
+                $base[$pos][$i],
+                self::equal($babs, $i + 1)
+            );
+        }
+        $minusT = new ParagonIE_Sodium_Core32_Curve25519_Ge_Precomp(
+            self::fe_copy($t->yminusx),
+            self::fe_copy($t->yplusx),
+            self::fe_neg($t->xy2d)
+        );
+        return self::cmov($t, $minusT, -$bnegative);
+    }
+
+    /**
+     * Subtract two group elements.
+     *
+     * r = p - q
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Ge_P3 $p
+     * @param ParagonIE_Sodium_Core32_Curve25519_Ge_Cached $q
+     * @return ParagonIE_Sodium_Core32_Curve25519_Ge_P1p1
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function ge_sub(
+        ParagonIE_Sodium_Core32_Curve25519_Ge_P3 $p,
+        ParagonIE_Sodium_Core32_Curve25519_Ge_Cached $q
+    ) {
+        $r = new ParagonIE_Sodium_Core32_Curve25519_Ge_P1p1();
+
+        $r->X = self::fe_add($p->Y, $p->X);
+        $r->Y = self::fe_sub($p->Y, $p->X);
+        $r->Z = self::fe_mul($r->X, $q->YminusX);
+        $r->Y = self::fe_mul($r->Y, $q->YplusX);
+        $r->T = self::fe_mul($q->T2d, $p->T);
+        $r->X = self::fe_mul($p->Z, $q->Z);
+        $t0 = self::fe_add($r->X, $r->X);
+        $r->X = self::fe_sub($r->Z, $r->Y);
+        $r->Y = self::fe_add($r->Z, $r->Y);
+        $r->Z = self::fe_sub($t0, $r->T);
+        $r->T = self::fe_add($t0, $r->T);
+
+        return $r;
+    }
+
+    /**
+     * Convert a group element to a byte string.
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Ge_P2 $h
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function ge_tobytes(ParagonIE_Sodium_Core32_Curve25519_Ge_P2 $h)
+    {
+        $recip = self::fe_invert($h->Z);
+        $x = self::fe_mul($h->X, $recip);
+        $y = self::fe_mul($h->Y, $recip);
+        $s = self::fe_tobytes($y);
+        $s[31] = self::intToChr(
+            self::chrToInt($s[31]) ^ (self::fe_isnegative($x) << 7)
+        );
+        return $s;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $a
+     * @param ParagonIE_Sodium_Core32_Curve25519_Ge_P3 $A
+     * @param string $b
+     * @return ParagonIE_Sodium_Core32_Curve25519_Ge_P2
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArrayAccess
+     */
+    public static function ge_double_scalarmult_vartime(
+        $a,
+        ParagonIE_Sodium_Core32_Curve25519_Ge_P3 $A,
+        $b
+    ) {
+        /** @var array<int, ParagonIE_Sodium_Core32_Curve25519_Ge_Cached> $Ai */
+        $Ai = array();
+
+        static $Bi = array();
+        /** @var array<int, ParagonIE_Sodium_Core32_Curve25519_Ge_Precomp> $Bi */
+        if (!$Bi) {
+            for ($i = 0; $i < 8; ++$i) {
+                $Bi[$i] = new ParagonIE_Sodium_Core32_Curve25519_Ge_Precomp(
+                    ParagonIE_Sodium_Core32_Curve25519_Fe::fromArray(
+                        array(
+                            ParagonIE_Sodium_Core32_Int32::fromInt(self::$base2[$i][0][0]),
+                            ParagonIE_Sodium_Core32_Int32::fromInt(self::$base2[$i][0][1]),
+                            ParagonIE_Sodium_Core32_Int32::fromInt(self::$base2[$i][0][2]),
+                            ParagonIE_Sodium_Core32_Int32::fromInt(self::$base2[$i][0][3]),
+                            ParagonIE_Sodium_Core32_Int32::fromInt(self::$base2[$i][0][4]),
+                            ParagonIE_Sodium_Core32_Int32::fromInt(self::$base2[$i][0][5]),
+                            ParagonIE_Sodium_Core32_Int32::fromInt(self::$base2[$i][0][6]),
+                            ParagonIE_Sodium_Core32_Int32::fromInt(self::$base2[$i][0][7]),
+                            ParagonIE_Sodium_Core32_Int32::fromInt(self::$base2[$i][0][8]),
+                            ParagonIE_Sodium_Core32_Int32::fromInt(self::$base2[$i][0][9])
+                        )
+                    ),
+                    ParagonIE_Sodium_Core32_Curve25519_Fe::fromArray(
+                        array(
+                            ParagonIE_Sodium_Core32_Int32::fromInt(self::$base2[$i][1][0]),
+                            ParagonIE_Sodium_Core32_Int32::fromInt(self::$base2[$i][1][1]),
+                            ParagonIE_Sodium_Core32_Int32::fromInt(self::$base2[$i][1][2]),
+                            ParagonIE_Sodium_Core32_Int32::fromInt(self::$base2[$i][1][3]),
+                            ParagonIE_Sodium_Core32_Int32::fromInt(self::$base2[$i][1][4]),
+                            ParagonIE_Sodium_Core32_Int32::fromInt(self::$base2[$i][1][5]),
+                            ParagonIE_Sodium_Core32_Int32::fromInt(self::$base2[$i][1][6]),
+                            ParagonIE_Sodium_Core32_Int32::fromInt(self::$base2[$i][1][7]),
+                            ParagonIE_Sodium_Core32_Int32::fromInt(self::$base2[$i][1][8]),
+                            ParagonIE_Sodium_Core32_Int32::fromInt(self::$base2[$i][1][9])
+                        )
+                    ),
+                    ParagonIE_Sodium_Core32_Curve25519_Fe::fromArray(
+                        array(
+                            ParagonIE_Sodium_Core32_Int32::fromInt(self::$base2[$i][2][0]),
+                            ParagonIE_Sodium_Core32_Int32::fromInt(self::$base2[$i][2][1]),
+                            ParagonIE_Sodium_Core32_Int32::fromInt(self::$base2[$i][2][2]),
+                            ParagonIE_Sodium_Core32_Int32::fromInt(self::$base2[$i][2][3]),
+                            ParagonIE_Sodium_Core32_Int32::fromInt(self::$base2[$i][2][4]),
+                            ParagonIE_Sodium_Core32_Int32::fromInt(self::$base2[$i][2][5]),
+                            ParagonIE_Sodium_Core32_Int32::fromInt(self::$base2[$i][2][6]),
+                            ParagonIE_Sodium_Core32_Int32::fromInt(self::$base2[$i][2][7]),
+                            ParagonIE_Sodium_Core32_Int32::fromInt(self::$base2[$i][2][8]),
+                            ParagonIE_Sodium_Core32_Int32::fromInt(self::$base2[$i][2][9])
+                        )
+                    )
+                );
+            }
+        }
+
+        for ($i = 0; $i < 8; ++$i) {
+            $Ai[$i] = new ParagonIE_Sodium_Core32_Curve25519_Ge_Cached(
+                self::fe_0(),
+                self::fe_0(),
+                self::fe_0(),
+                self::fe_0()
+            );
+        }
+        /** @var array<int, ParagonIE_Sodium_Core32_Curve25519_Ge_Cached> $Ai */
+
+        # slide(aslide,a);
+        # slide(bslide,b);
+        /** @var array<int, int> $aslide */
+        $aslide = self::slide($a);
+        /** @var array<int, int> $bslide */
+        $bslide = self::slide($b);
+
+        # ge_p3_to_cached(&Ai[0],A);
+        # ge_p3_dbl(&t,A); ge_p1p1_to_p3(&A2,&t);
+        $Ai[0] = self::ge_p3_to_cached($A);
+        $t = self::ge_p3_dbl($A);
+        $A2 = self::ge_p1p1_to_p3($t);
+
+        # ge_add(&t,&A2,&Ai[0]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[1],&u);
+        # ge_add(&t,&A2,&Ai[1]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[2],&u);
+        # ge_add(&t,&A2,&Ai[2]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[3],&u);
+        # ge_add(&t,&A2,&Ai[3]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[4],&u);
+        # ge_add(&t,&A2,&Ai[4]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[5],&u);
+        # ge_add(&t,&A2,&Ai[5]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[6],&u);
+        # ge_add(&t,&A2,&Ai[6]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[7],&u);
+        for ($i = 0; $i < 7; ++$i) {
+            $t = self::ge_add($A2, $Ai[$i]);
+            $u = self::ge_p1p1_to_p3($t);
+            $Ai[$i + 1] = self::ge_p3_to_cached($u);
+        }
+
+        # ge_p2_0(r);
+        $r = self::ge_p2_0();
+
+        # for (i = 255;i >= 0;--i) {
+        #     if (aslide[i] || bslide[i]) break;
+        # }
+        $i = 255;
+        for (; $i >= 0; --$i) {
+            if ($aslide[$i] || $bslide[$i]) {
+                break;
+            }
+        }
+
+        # for (;i >= 0;--i) {
+        for (; $i >= 0; --$i) {
+            # ge_p2_dbl(&t,r);
+            $t = self::ge_p2_dbl($r);
+
+            # if (aslide[i] > 0) {
+            if ($aslide[$i] > 0) {
+                # ge_p1p1_to_p3(&u,&t);
+                # ge_add(&t,&u,&Ai[aslide[i]/2]);
+                $u = self::ge_p1p1_to_p3($t);
+                $t = self::ge_add(
+                    $u,
+                    $Ai[(int) floor($aslide[$i] / 2)]
+                );
+                # } else if (aslide[i] < 0) {
+            } elseif ($aslide[$i] < 0) {
+                # ge_p1p1_to_p3(&u,&t);
+                # ge_sub(&t,&u,&Ai[(-aslide[i])/2]);
+                $u = self::ge_p1p1_to_p3($t);
+                $t = self::ge_sub(
+                    $u,
+                    $Ai[(int) floor(-$aslide[$i] / 2)]
+                );
+            }
+            /** @var array<int, ParagonIE_Sodium_Core32_Curve25519_Ge_Precomp> $Bi */
+
+            # if (bslide[i] > 0) {
+            if ($bslide[$i] > 0) {
+                # ge_p1p1_to_p3(&u,&t);
+                # ge_madd(&t,&u,&Bi[bslide[i]/2]);
+                $u = self::ge_p1p1_to_p3($t);
+                /** @var int $index */
+                $index = (int) floor($bslide[$i] / 2);
+                /** @var ParagonIE_Sodium_Core32_Curve25519_Ge_Precomp $thisB */
+                $thisB = $Bi[$index];
+                $t = self::ge_madd($t, $u, $thisB);
+                # } else if (bslide[i] < 0) {
+            } elseif ($bslide[$i] < 0) {
+                # ge_p1p1_to_p3(&u,&t);
+                # ge_msub(&t,&u,&Bi[(-bslide[i])/2]);
+                $u = self::ge_p1p1_to_p3($t);
+
+                /** @var int $index */
+                $index = (int) floor(-$bslide[$i] / 2);
+
+                /** @var ParagonIE_Sodium_Core32_Curve25519_Ge_Precomp $thisB */
+                $thisB = $Bi[$index];
+                $t = self::ge_msub($t, $u, $thisB);
+            }
+            # ge_p1p1_to_p2(r,&t);
+            $r = self::ge_p1p1_to_p2($t);
+        }
+        return $r;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $a
+     * @return ParagonIE_Sodium_Core32_Curve25519_Ge_P3
+     * @psalm-suppress MixedAssignment
+     * @psalm-suppress MixedOperand
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function ge_scalarmult_base($a)
+    {
+        /** @var array<int, int> $e */
+        $e = array();
+        $r = new ParagonIE_Sodium_Core32_Curve25519_Ge_P1p1();
+
+        for ($i = 0; $i < 32; ++$i) {
+            /** @var int $dbl */
+            $dbl = (int) $i << 1;
+            $e[$dbl] = (int) self::chrToInt($a[$i]) & 15;
+            $e[$dbl + 1] = (int) (self::chrToInt($a[$i]) >> 4) & 15;
+        }
+
+        /** @var int $carry */
+        $carry = 0;
+        for ($i = 0; $i < 63; ++$i) {
+            $e[$i] += $carry;
+            /** @var int $carry */
+            $carry = $e[$i] + 8;
+            /** @var int $carry */
+            $carry >>= 4;
+            $e[$i] -= $carry << 4;
+        }
+
+        /** @var array<int, int> $e */
+        $e[63] += (int) $carry;
+
+        $h = self::ge_p3_0();
+
+        for ($i = 1; $i < 64; $i += 2) {
+            $t = self::ge_select((int) floor($i / 2), (int) $e[$i]);
+            $r = self::ge_madd($r, $h, $t);
+            $h = self::ge_p1p1_to_p3($r);
+        }
+
+        $r = self::ge_p3_dbl($h);
+
+        $s = self::ge_p1p1_to_p2($r);
+        $r = self::ge_p2_dbl($s);
+        $s = self::ge_p1p1_to_p2($r);
+        $r = self::ge_p2_dbl($s);
+        $s = self::ge_p1p1_to_p2($r);
+        $r = self::ge_p2_dbl($s);
+
+        $h = self::ge_p1p1_to_p3($r);
+
+        for ($i = 0; $i < 64; $i += 2) {
+            $t = self::ge_select($i >> 1, (int) $e[$i]);
+            $r = self::ge_madd($r, $h, $t);
+            $h = self::ge_p1p1_to_p3($r);
+        }
+        return $h;
+    }
+
+    /**
+     * Calculates (ab + c) mod l
+     * where l = 2^252 + 27742317777372353535851937790883648493
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $a
+     * @param string $b
+     * @param string $c
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function sc_muladd($a, $b, $c)
+    {
+        $a0 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & self::load_3(self::substr($a, 0, 3)));
+        $a1 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_4(self::substr($a, 2, 4)) >> 5));
+        $a2 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_3(self::substr($a, 5, 3)) >> 2));
+        $a3 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_4(self::substr($a, 7, 4)) >> 7));
+        $a4 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_4(self::substr($a, 10, 4)) >> 4));
+        $a5 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_3(self::substr($a, 13, 3)) >> 1));
+        $a6 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_4(self::substr($a, 15, 4)) >> 6));
+        $a7 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_3(self::substr($a, 18, 3)) >> 3));
+        $a8 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & self::load_3(self::substr($a, 21, 3)));
+        $a9 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_4(self::substr($a, 23, 4)) >> 5));
+        $a10 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_3(self::substr($a, 26, 3)) >> 2));
+        $a11 = ParagonIE_Sodium_Core32_Int64::fromInt(0x1fffffff & (self::load_4(self::substr($a, 28, 4)) >> 7));
+        $b0 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & self::load_3(self::substr($b, 0, 3)));
+        $b1 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_4(self::substr($b, 2, 4)) >> 5));
+        $b2 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_3(self::substr($b, 5, 3)) >> 2));
+        $b3 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_4(self::substr($b, 7, 4)) >> 7));
+        $b4 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_4(self::substr($b, 10, 4)) >> 4));
+        $b5 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_3(self::substr($b, 13, 3)) >> 1));
+        $b6 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_4(self::substr($b, 15, 4)) >> 6));
+        $b7 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_3(self::substr($b, 18, 3)) >> 3));
+        $b8 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & self::load_3(self::substr($b, 21, 3)));
+        $b9 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_4(self::substr($b, 23, 4)) >> 5));
+        $b10 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_3(self::substr($b, 26, 3)) >> 2));
+        $b11 = ParagonIE_Sodium_Core32_Int64::fromInt(0x1fffffff & (self::load_4(self::substr($b, 28, 4)) >> 7));
+        $c0 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & self::load_3(self::substr($c, 0, 3)));
+        $c1 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_4(self::substr($c, 2, 4)) >> 5));
+        $c2 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_3(self::substr($c, 5, 3)) >> 2));
+        $c3 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_4(self::substr($c, 7, 4)) >> 7));
+        $c4 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_4(self::substr($c, 10, 4)) >> 4));
+        $c5 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_3(self::substr($c, 13, 3)) >> 1));
+        $c6 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_4(self::substr($c, 15, 4)) >> 6));
+        $c7 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_3(self::substr($c, 18, 3)) >> 3));
+        $c8 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & self::load_3(self::substr($c, 21, 3)));
+        $c9 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_4(self::substr($c, 23, 4)) >> 5));
+        $c10 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_3(self::substr($c, 26, 3)) >> 2));
+        $c11 = ParagonIE_Sodium_Core32_Int64::fromInt(0x1fffffff & (self::load_4(self::substr($c, 28, 4)) >> 7));
+
+        /* Can't really avoid the pyramid here: */
+        /**
+         * @var ParagonIE_Sodium_Core32_Int64 $s0
+         * @var ParagonIE_Sodium_Core32_Int64 $s1
+         * @var ParagonIE_Sodium_Core32_Int64 $s2
+         * @var ParagonIE_Sodium_Core32_Int64 $s3
+         * @var ParagonIE_Sodium_Core32_Int64 $s4
+         * @var ParagonIE_Sodium_Core32_Int64 $s5
+         * @var ParagonIE_Sodium_Core32_Int64 $s6
+         * @var ParagonIE_Sodium_Core32_Int64 $s7
+         * @var ParagonIE_Sodium_Core32_Int64 $s8
+         * @var ParagonIE_Sodium_Core32_Int64 $s9
+         * @var ParagonIE_Sodium_Core32_Int64 $s10
+         * @var ParagonIE_Sodium_Core32_Int64 $s11
+         * @var ParagonIE_Sodium_Core32_Int64 $s12
+         * @var ParagonIE_Sodium_Core32_Int64 $s13
+         * @var ParagonIE_Sodium_Core32_Int64 $s14
+         * @var ParagonIE_Sodium_Core32_Int64 $s15
+         * @var ParagonIE_Sodium_Core32_Int64 $s16
+         * @var ParagonIE_Sodium_Core32_Int64 $s17
+         * @var ParagonIE_Sodium_Core32_Int64 $s18
+         * @var ParagonIE_Sodium_Core32_Int64 $s19
+         * @var ParagonIE_Sodium_Core32_Int64 $s20
+         * @var ParagonIE_Sodium_Core32_Int64 $s21
+         * @var ParagonIE_Sodium_Core32_Int64 $s22
+         * @var ParagonIE_Sodium_Core32_Int64 $s23
+         */
+
+        $s0 = $c0->addInt64($a0->mulInt64($b0, 24));
+        $s1 = $c1->addInt64($a0->mulInt64($b1, 24))->addInt64($a1->mulInt64($b0, 24));
+        $s2 = $c2->addInt64($a0->mulInt64($b2, 24))->addInt64($a1->mulInt64($b1, 24))->addInt64($a2->mulInt64($b0, 24));
+        $s3 = $c3->addInt64($a0->mulInt64($b3, 24))->addInt64($a1->mulInt64($b2, 24))->addInt64($a2->mulInt64($b1, 24))
+                 ->addInt64($a3->mulInt64($b0, 24));
+        $s4 = $c4->addInt64($a0->mulInt64($b4, 24))->addInt64($a1->mulInt64($b3, 24))->addInt64($a2->mulInt64($b2, 24))
+                 ->addInt64($a3->mulInt64($b1, 24))->addInt64($a4->mulInt64($b0, 24));
+        $s5 = $c5->addInt64($a0->mulInt64($b5, 24))->addInt64($a1->mulInt64($b4, 24))->addInt64($a2->mulInt64($b3, 24))
+                 ->addInt64($a3->mulInt64($b2, 24))->addInt64($a4->mulInt64($b1, 24))->addInt64($a5->mulInt64($b0, 24));
+        $s6 = $c6->addInt64($a0->mulInt64($b6, 24))->addInt64($a1->mulInt64($b5, 24))->addInt64($a2->mulInt64($b4, 24))
+                 ->addInt64($a3->mulInt64($b3, 24))->addInt64($a4->mulInt64($b2, 24))->addInt64($a5->mulInt64($b1, 24))
+                 ->addInt64($a6->mulInt64($b0, 24));
+        $s7 = $c7->addInt64($a0->mulInt64($b7, 24))->addInt64($a1->mulInt64($b6, 24))->addInt64($a2->mulInt64($b5, 24))
+                 ->addInt64($a3->mulInt64($b4, 24))->addInt64($a4->mulInt64($b3, 24))->addInt64($a5->mulInt64($b2, 24))
+                 ->addInt64($a6->mulInt64($b1, 24))->addInt64($a7->mulInt64($b0, 24));
+        $s8 = $c8->addInt64($a0->mulInt64($b8, 24))->addInt64($a1->mulInt64($b7, 24))->addInt64($a2->mulInt64($b6, 24))
+                 ->addInt64($a3->mulInt64($b5, 24))->addInt64($a4->mulInt64($b4, 24))->addInt64($a5->mulInt64($b3, 24))
+                 ->addInt64($a6->mulInt64($b2, 24))->addInt64($a7->mulInt64($b1, 24))->addInt64($a8->mulInt64($b0, 24));
+        $s9 = $c9->addInt64($a0->mulInt64($b9, 24))->addInt64($a1->mulInt64($b8, 24))->addInt64($a2->mulInt64($b7, 24))
+                 ->addInt64($a3->mulInt64($b6, 24))->addInt64($a4->mulInt64($b5, 24))->addInt64($a5->mulInt64($b4, 24))
+                 ->addInt64($a6->mulInt64($b3, 24))->addInt64($a7->mulInt64($b2, 24))->addInt64($a8->mulInt64($b1, 24))
+                 ->addInt64($a9->mulInt64($b0, 24));
+        $s10 = $c10->addInt64($a0->mulInt64($b10, 24))->addInt64($a1->mulInt64($b9, 24))->addInt64($a2->mulInt64($b8, 24))
+                   ->addInt64($a3->mulInt64($b7, 24))->addInt64($a4->mulInt64($b6, 24))->addInt64($a5->mulInt64($b5, 24))
+                   ->addInt64($a6->mulInt64($b4, 24))->addInt64($a7->mulInt64($b3, 24))->addInt64($a8->mulInt64($b2, 24))
+                   ->addInt64($a9->mulInt64($b1, 24))->addInt64($a10->mulInt64($b0, 24));
+        $s11 = $c11->addInt64($a0->mulInt64($b11, 24))->addInt64($a1->mulInt64($b10, 24))->addInt64($a2->mulInt64($b9, 24))
+                   ->addInt64($a3->mulInt64($b8, 24))->addInt64($a4->mulInt64($b7, 24))->addInt64($a5->mulInt64($b6, 24))
+                   ->addInt64($a6->mulInt64($b5, 24))->addInt64($a7->mulInt64($b4, 24))->addInt64($a8->mulInt64($b3, 24))
+                   ->addInt64($a9->mulInt64($b2, 24))->addInt64($a10->mulInt64($b1, 24))->addInt64($a11->mulInt64($b0, 24));
+        $s12 = $a1->mulInt64($b11, 24)->addInt64($a2->mulInt64($b10, 24))->addInt64($a3->mulInt64($b9, 24))
+                  ->addInt64($a4->mulInt64($b8, 24))->addInt64($a5->mulInt64($b7, 24))->addInt64($a6->mulInt64($b6, 24))
+                  ->addInt64($a7->mulInt64($b5, 24))->addInt64($a8->mulInt64($b4, 24))->addInt64($a9->mulInt64($b3, 24))
+                  ->addInt64($a10->mulInt64($b2, 24))->addInt64($a11->mulInt64($b1, 24));
+        $s13 = $a2->mulInt64($b11, 24)->addInt64($a3->mulInt64($b10, 24))->addInt64($a4->mulInt64($b9, 24))
+                  ->addInt64($a5->mulInt64($b8, 24))->addInt64($a6->mulInt64($b7, 24))->addInt64($a7->mulInt64($b6, 24))
+                  ->addInt64($a8->mulInt64($b5, 24))->addInt64($a9->mulInt64($b4, 24))->addInt64($a10->mulInt64($b3, 24))
+                  ->addInt64($a11->mulInt64($b2, 24));
+        $s14 = $a3->mulInt64($b11, 24)->addInt64($a4->mulInt64($b10, 24))->addInt64($a5->mulInt64($b9, 24))
+                  ->addInt64($a6->mulInt64($b8, 24))->addInt64($a7->mulInt64($b7, 24))->addInt64($a8->mulInt64($b6, 24))
+                  ->addInt64($a9->mulInt64($b5, 24))->addInt64($a10->mulInt64($b4, 24))->addInt64($a11->mulInt64($b3, 24));
+        $s15 = $a4->mulInt64($b11, 24)->addInt64($a5->mulInt64($b10, 24))->addInt64($a6->mulInt64($b9, 24))
+                  ->addInt64($a7->mulInt64($b8, 24))->addInt64($a8->mulInt64($b7, 24))->addInt64($a9->mulInt64($b6, 24))
+                  ->addInt64($a10->mulInt64($b5, 24))->addInt64($a11->mulInt64($b4, 24));
+        $s16 = $a5->mulInt64($b11, 24)->addInt64($a6->mulInt64($b10, 24))->addInt64($a7->mulInt64($b9, 24))
+                  ->addInt64($a8->mulInt64($b8, 24))->addInt64($a9->mulInt64($b7, 24))->addInt64($a10->mulInt64($b6, 24))
+                  ->addInt64($a11->mulInt64($b5, 24));
+        $s17 = $a6->mulInt64($b11, 24)->addInt64($a7->mulInt64($b10, 24))->addInt64($a8->mulInt64($b9, 24))
+                  ->addInt64($a9->mulInt64($b8, 24))->addInt64($a10->mulInt64($b7, 24))->addInt64($a11->mulInt64($b6, 24));
+        $s18 = $a7->mulInt64($b11, 24)->addInt64($a8->mulInt64($b10, 24))->addInt64($a9->mulInt64($b9, 24))
+                  ->addInt64($a10->mulInt64($b8, 24))->addInt64($a11->mulInt64($b7, 24));
+        $s19 = $a8->mulInt64($b11, 24)->addInt64($a9->mulInt64($b10, 24))->addInt64($a10->mulInt64($b9, 24))
+                  ->addInt64($a11->mulInt64($b8, 24));
+        $s20 = $a9->mulInt64($b11, 24)->addInt64($a10->mulInt64($b10, 24))->addInt64($a11->mulInt64($b9, 24));
+        $s21 = $a10->mulInt64($b11, 24)->addInt64($a11->mulInt64($b10, 24));
+        $s22 = $a11->mulInt64($b11, 24);
+        $s23 = new ParagonIE_Sodium_Core32_Int64();
+
+        $carry0 = $s0->addInt(1 << 20)->shiftRight(21);
+        $s1 = $s1->addInt64($carry0);
+        $s0 = $s0->subInt64($carry0->shiftLeft(21));
+        $carry2 = $s2->addInt(1 << 20)->shiftRight(21);
+        $s3 = $s3->addInt64($carry2);
+        $s2 = $s2->subInt64($carry2->shiftLeft(21));
+        $carry4 = $s4->addInt(1 << 20)->shiftRight(21);
+        $s5 = $s5->addInt64($carry4);
+        $s4 = $s4->subInt64($carry4->shiftLeft(21));
+        $carry6 = $s6->addInt(1 << 20)->shiftRight(21);
+        $s7 = $s7->addInt64($carry6);
+        $s6 = $s6->subInt64($carry6->shiftLeft(21));
+        $carry8 = $s8->addInt(1 << 20)->shiftRight(21);
+        $s9 = $s9->addInt64($carry8);
+        $s8 = $s8->subInt64($carry8->shiftLeft(21));
+        $carry10 = $s10->addInt(1 << 20)->shiftRight(21);
+        $s11 = $s11->addInt64($carry10);
+        $s10 = $s10->subInt64($carry10->shiftLeft(21));
+        $carry12 = $s12->addInt(1 << 20)->shiftRight(21);
+        $s13 = $s13->addInt64($carry12);
+        $s12 = $s12->subInt64($carry12->shiftLeft(21));
+        $carry14 = $s14->addInt(1 << 20)->shiftRight(21);
+        $s15 = $s15->addInt64($carry14);
+        $s14 = $s14->subInt64($carry14->shiftLeft(21));
+        $carry16 = $s16->addInt(1 << 20)->shiftRight(21);
+        $s17 = $s17->addInt64($carry16);
+        $s16 = $s16->subInt64($carry16->shiftLeft(21));
+        $carry18 = $s18->addInt(1 << 20)->shiftRight(21);
+        $s19 = $s19->addInt64($carry18);
+        $s18 = $s18->subInt64($carry18->shiftLeft(21));
+        $carry20 = $s20->addInt(1 << 20)->shiftRight(21);
+        $s21 = $s21->addInt64($carry20);
+        $s20 = $s20->subInt64($carry20->shiftLeft(21));
+        $carry22 = $s22->addInt(1 << 20)->shiftRight(21);
+        $s23 = $s23->addInt64($carry22);
+        $s22 = $s22->subInt64($carry22->shiftLeft(21));
+
+        $carry1 = $s1->addInt(1 << 20)->shiftRight(21);
+        $s2 = $s2->addInt64($carry1);
+        $s1 = $s1->subInt64($carry1->shiftLeft(21));
+        $carry3 = $s3->addInt(1 << 20)->shiftRight(21);
+        $s4 = $s4->addInt64($carry3);
+        $s3 = $s3->subInt64($carry3->shiftLeft(21));
+        $carry5 = $s5->addInt(1 << 20)->shiftRight(21);
+        $s6 = $s6->addInt64($carry5);
+        $s5 = $s5->subInt64($carry5->shiftLeft(21));
+        $carry7 = $s7->addInt(1 << 20)->shiftRight(21);
+        $s8 = $s8->addInt64($carry7);
+        $s7 = $s7->subInt64($carry7->shiftLeft(21));
+        $carry9 = $s9->addInt(1 << 20)->shiftRight(21);
+        $s10 = $s10->addInt64($carry9);
+        $s9 = $s9->subInt64($carry9->shiftLeft(21));
+        $carry11 = $s11->addInt(1 << 20)->shiftRight(21);
+        $s12 = $s12->addInt64($carry11);
+        $s11 = $s11->subInt64($carry11->shiftLeft(21));
+        $carry13 = $s13->addInt(1 << 20)->shiftRight(21);
+        $s14 = $s14->addInt64($carry13);
+        $s13 = $s13->subInt64($carry13->shiftLeft(21));
+        $carry15 = $s15->addInt(1 << 20)->shiftRight(21);
+        $s16 = $s16->addInt64($carry15);
+        $s15 = $s15->subInt64($carry15->shiftLeft(21));
+        $carry17 = $s17->addInt(1 << 20)->shiftRight(21);
+        $s18 = $s18->addInt64($carry17);
+        $s17 = $s17->subInt64($carry17->shiftLeft(21));
+        $carry19 = $s19->addInt(1 << 20)->shiftRight(21);
+        $s20 = $s20->addInt64($carry19);
+        $s19 = $s19->subInt64($carry19->shiftLeft(21));
+        $carry21 = $s21->addInt(1 << 20)->shiftRight(21);
+        $s22 = $s22->addInt64($carry21);
+        $s21 = $s21->subInt64($carry21->shiftLeft(21));
+
+        $s11 = $s11->addInt64($s23->mulInt(666643, 20));
+        $s12 = $s12->addInt64($s23->mulInt(470296, 19));
+        $s13 = $s13->addInt64($s23->mulInt(654183, 20));
+        $s14 = $s14->subInt64($s23->mulInt(997805, 20));
+        $s15 = $s15->addInt64($s23->mulInt(136657, 18));
+        $s16 = $s16->subInt64($s23->mulInt(683901, 20));
+
+        $s10 = $s10->addInt64($s22->mulInt(666643, 20));
+        $s11 = $s11->addInt64($s22->mulInt(470296, 19));
+        $s12 = $s12->addInt64($s22->mulInt(654183, 20));
+        $s13 = $s13->subInt64($s22->mulInt(997805, 20));
+        $s14 = $s14->addInt64($s22->mulInt(136657, 18));
+        $s15 = $s15->subInt64($s22->mulInt(683901, 20));
+
+        $s9  =  $s9->addInt64($s21->mulInt(666643, 20));
+        $s10 = $s10->addInt64($s21->mulInt(470296, 19));
+        $s11 = $s11->addInt64($s21->mulInt(654183, 20));
+        $s12 = $s12->subInt64($s21->mulInt(997805, 20));
+        $s13 = $s13->addInt64($s21->mulInt(136657, 18));
+        $s14 = $s14->subInt64($s21->mulInt(683901, 20));
+
+        $s8  =  $s8->addInt64($s20->mulInt(666643, 20));
+        $s9  =  $s9->addInt64($s20->mulInt(470296, 19));
+        $s10 = $s10->addInt64($s20->mulInt(654183, 20));
+        $s11 = $s11->subInt64($s20->mulInt(997805, 20));
+        $s12 = $s12->addInt64($s20->mulInt(136657, 18));
+        $s13 = $s13->subInt64($s20->mulInt(683901, 20));
+
+        $s7  =  $s7->addInt64($s19->mulInt(666643, 20));
+        $s8  =  $s8->addInt64($s19->mulInt(470296, 19));
+        $s9  =  $s9->addInt64($s19->mulInt(654183, 20));
+        $s10 = $s10->subInt64($s19->mulInt(997805, 20));
+        $s11 = $s11->addInt64($s19->mulInt(136657, 18));
+        $s12 = $s12->subInt64($s19->mulInt(683901, 20));
+
+        $s6  =  $s6->addInt64($s18->mulInt(666643, 20));
+        $s7  =  $s7->addInt64($s18->mulInt(470296, 19));
+        $s8  =  $s8->addInt64($s18->mulInt(654183, 20));
+        $s9  =  $s9->subInt64($s18->mulInt(997805, 20));
+        $s10 = $s10->addInt64($s18->mulInt(136657, 18));
+        $s11 = $s11->subInt64($s18->mulInt(683901, 20));
+
+        $carry6 = $s6->addInt(1 << 20)->shiftRight(21);
+        $s7 = $s7->addInt64($carry6);
+        $s6 = $s6->subInt64($carry6->shiftLeft(21));
+        $carry8 = $s8->addInt(1 << 20)->shiftRight(21);
+        $s9 = $s9->addInt64($carry8);
+        $s8 = $s8->subInt64($carry8->shiftLeft(21));
+        $carry10 = $s10->addInt(1 << 20)->shiftRight(21);
+        $s11 = $s11->addInt64($carry10);
+        $s10 = $s10->subInt64($carry10->shiftLeft(21));
+        $carry12 = $s12->addInt(1 << 20)->shiftRight(21);
+        $s13 = $s13->addInt64($carry12);
+        $s12 = $s12->subInt64($carry12->shiftLeft(21));
+        $carry14 = $s14->addInt(1 << 20)->shiftRight(21);
+        $s15 = $s15->addInt64($carry14);
+        $s14 = $s14->subInt64($carry14->shiftLeft(21));
+        $carry16 = $s16->addInt(1 << 20)->shiftRight(21);
+        $s17 = $s17->addInt64($carry16);
+        $s16 = $s16->subInt64($carry16->shiftLeft(21));
+
+        $carry7 = $s7->addInt(1 << 20)->shiftRight(21);
+        $s8 = $s8->addInt64($carry7);
+        $s7 = $s7->subInt64($carry7->shiftLeft(21));
+        $carry9 = $s9->addInt(1 << 20)->shiftRight(21);
+        $s10 = $s10->addInt64($carry9);
+        $s9 = $s9->subInt64($carry9->shiftLeft(21));
+        $carry11 = $s11->addInt(1 << 20)->shiftRight(21);
+        $s12 = $s12->addInt64($carry11);
+        $s11 = $s11->subInt64($carry11->shiftLeft(21));
+        $carry13 = $s13->addInt(1 << 20)->shiftRight(21);
+        $s14 = $s14->addInt64($carry13);
+        $s13 = $s13->subInt64($carry13->shiftLeft(21));
+        $carry15 = $s15->addInt(1 << 20)->shiftRight(21);
+        $s16 = $s16->addInt64($carry15);
+        $s15 = $s15->subInt64($carry15->shiftLeft(21));
+
+        $s5  =  $s5->addInt64($s17->mulInt(666643, 20));
+        $s6  =  $s6->addInt64($s17->mulInt(470296, 19));
+        $s7  =  $s7->addInt64($s17->mulInt(654183, 20));
+        $s8  =  $s8->subInt64($s17->mulInt(997805, 20));
+        $s9  =  $s9->addInt64($s17->mulInt(136657, 18));
+        $s10 = $s10->subInt64($s17->mulInt(683901, 20));
+
+        $s4  =  $s4->addInt64($s16->mulInt(666643, 20));
+        $s5  =  $s5->addInt64($s16->mulInt(470296, 19));
+        $s6  =  $s6->addInt64($s16->mulInt(654183, 20));
+        $s7  =  $s7->subInt64($s16->mulInt(997805, 20));
+        $s8  =  $s8->addInt64($s16->mulInt(136657, 18));
+        $s9  =  $s9->subInt64($s16->mulInt(683901, 20));
+
+        $s3  =  $s3->addInt64($s15->mulInt(666643, 20));
+        $s4  =  $s4->addInt64($s15->mulInt(470296, 19));
+        $s5  =  $s5->addInt64($s15->mulInt(654183, 20));
+        $s6  =  $s6->subInt64($s15->mulInt(997805, 20));
+        $s7  =  $s7->addInt64($s15->mulInt(136657, 18));
+        $s8  =  $s8->subInt64($s15->mulInt(683901, 20));
+
+        $s2  =  $s2->addInt64($s14->mulInt(666643, 20));
+        $s3  =  $s3->addInt64($s14->mulInt(470296, 19));
+        $s4  =  $s4->addInt64($s14->mulInt(654183, 20));
+        $s5  =  $s5->subInt64($s14->mulInt(997805, 20));
+        $s6  =  $s6->addInt64($s14->mulInt(136657, 18));
+        $s7  =  $s7->subInt64($s14->mulInt(683901, 20));
+
+        $s1  =  $s1->addInt64($s13->mulInt(666643, 20));
+        $s2  =  $s2->addInt64($s13->mulInt(470296, 19));
+        $s3  =  $s3->addInt64($s13->mulInt(654183, 20));
+        $s4  =  $s4->subInt64($s13->mulInt(997805, 20));
+        $s5  =  $s5->addInt64($s13->mulInt(136657, 18));
+        $s6  =  $s6->subInt64($s13->mulInt(683901, 20));
+
+        $s0  =  $s0->addInt64($s12->mulInt(666643, 20));
+        $s1  =  $s1->addInt64($s12->mulInt(470296, 19));
+        $s2  =  $s2->addInt64($s12->mulInt(654183, 20));
+        $s3  =  $s3->subInt64($s12->mulInt(997805, 20));
+        $s4  =  $s4->addInt64($s12->mulInt(136657, 18));
+        $s5  =  $s5->subInt64($s12->mulInt(683901, 20));
+        $s12 = new ParagonIE_Sodium_Core32_Int64();
+
+        $carry0 = $s0->addInt(1 << 20)->shiftRight(21);
+        $s1 = $s1->addInt64($carry0);
+        $s0 = $s0->subInt64($carry0->shiftLeft(21));
+        $carry2 = $s2->addInt(1 << 20)->shiftRight(21);
+        $s3 = $s3->addInt64($carry2);
+        $s2 = $s2->subInt64($carry2->shiftLeft(21));
+        $carry4 = $s4->addInt(1 << 20)->shiftRight(21);
+        $s5 = $s5->addInt64($carry4);
+        $s4 = $s4->subInt64($carry4->shiftLeft(21));
+        $carry6 = $s6->addInt(1 << 20)->shiftRight(21);
+        $s7 = $s7->addInt64($carry6);
+        $s6 = $s6->subInt64($carry6->shiftLeft(21));
+        $carry8 = $s8->addInt(1 << 20)->shiftRight(21);
+        $s9 = $s9->addInt64($carry8);
+        $s8 = $s8->subInt64($carry8->shiftLeft(21));
+        $carry10 = $s10->addInt(1 << 20)->shiftRight(21);
+        $s11 = $s11->addInt64($carry10);
+        $s10 = $s10->subInt64($carry10->shiftLeft(21));
+
+        $carry1 = $s1->addInt(1 << 20)->shiftRight(21);
+        $s2 = $s2->addInt64($carry1);
+        $s1 = $s1->subInt64($carry1->shiftLeft(21));
+        $carry3 = $s3->addInt(1 << 20)->shiftRight(21);
+        $s4 = $s4->addInt64($carry3);
+        $s3 = $s3->subInt64($carry3->shiftLeft(21));
+        $carry5 = $s5->addInt(1 << 20)->shiftRight(21);
+        $s6 = $s6->addInt64($carry5);
+        $s5 = $s5->subInt64($carry5->shiftLeft(21));
+        $carry7 = $s7->addInt(1 << 20)->shiftRight(21);
+        $s8 = $s8->addInt64($carry7);
+        $s7 = $s7->subInt64($carry7->shiftLeft(21));
+        $carry9 = $s9->addInt(1 << 20)->shiftRight(21);
+        $s10 = $s10->addInt64($carry9);
+        $s9 = $s9->subInt64($carry9->shiftLeft(21));
+        $carry11 = $s11->addInt(1 << 20)->shiftRight(21);
+        $s12 = $s12->addInt64($carry11);
+        $s11 = $s11->subInt64($carry11->shiftLeft(21));
+
+        $s0  =  $s0->addInt64($s12->mulInt(666643, 20));
+        $s1  =  $s1->addInt64($s12->mulInt(470296, 19));
+        $s2  =  $s2->addInt64($s12->mulInt(654183, 20));
+        $s3  =  $s3->subInt64($s12->mulInt(997805, 20));
+        $s4  =  $s4->addInt64($s12->mulInt(136657, 18));
+        $s5  =  $s5->subInt64($s12->mulInt(683901, 20));
+        $s12 = new ParagonIE_Sodium_Core32_Int64();
+
+        $carry0 = $s0->shiftRight(21);
+        $s1 = $s1->addInt64($carry0);
+        $s0 = $s0->subInt64($carry0->shiftLeft(21));
+        $carry1 = $s1->shiftRight(21);
+        $s2 = $s2->addInt64($carry1);
+        $s1 = $s1->subInt64($carry1->shiftLeft(21));
+        $carry2 = $s2->shiftRight(21);
+        $s3 = $s3->addInt64($carry2);
+        $s2 = $s2->subInt64($carry2->shiftLeft(21));
+        $carry3 = $s3->shiftRight(21);
+        $s4 = $s4->addInt64($carry3);
+        $s3 = $s3->subInt64($carry3->shiftLeft(21));
+        $carry4 = $s4->shiftRight(21);
+        $s5 = $s5->addInt64($carry4);
+        $s4 = $s4->subInt64($carry4->shiftLeft(21));
+        $carry5 = $s5->shiftRight(21);
+        $s6 = $s6->addInt64($carry5);
+        $s5 = $s5->subInt64($carry5->shiftLeft(21));
+        $carry6 = $s6->shiftRight(21);
+        $s7 = $s7->addInt64($carry6);
+        $s6 = $s6->subInt64($carry6->shiftLeft(21));
+        $carry7 = $s7->shiftRight(21);
+        $s8 = $s8->addInt64($carry7);
+        $s7 = $s7->subInt64($carry7->shiftLeft(21));
+        $carry8 = $s8->shiftRight(21);
+        $s9 = $s9->addInt64($carry8);
+        $s8 = $s8->subInt64($carry8->shiftLeft(21));
+        $carry9 = $s9->shiftRight(21);
+        $s10 = $s10->addInt64($carry9);
+        $s9 = $s9->subInt64($carry9->shiftLeft(21));
+        $carry10 = $s10->shiftRight(21);
+        $s11 = $s11->addInt64($carry10);
+        $s10 = $s10->subInt64($carry10->shiftLeft(21));
+        $carry11 = $s11->shiftRight(21);
+        $s12 = $s12->addInt64($carry11);
+        $s11 = $s11->subInt64($carry11->shiftLeft(21));
+
+        $s0  =  $s0->addInt64($s12->mulInt(666643, 20));
+        $s1  =  $s1->addInt64($s12->mulInt(470296, 19));
+        $s2  =  $s2->addInt64($s12->mulInt(654183, 20));
+        $s3  =  $s3->subInt64($s12->mulInt(997805, 20));
+        $s4  =  $s4->addInt64($s12->mulInt(136657, 18));
+        $s5  =  $s5->subInt64($s12->mulInt(683901, 20));
+
+        $carry0 = $s0->shiftRight(21);
+        $s1 = $s1->addInt64($carry0);
+        $s0 = $s0->subInt64($carry0->shiftLeft(21));
+        $carry1 = $s1->shiftRight(21);
+        $s2 = $s2->addInt64($carry1);
+        $s1 = $s1->subInt64($carry1->shiftLeft(21));
+        $carry2 = $s2->shiftRight(21);
+        $s3 = $s3->addInt64($carry2);
+        $s2 = $s2->subInt64($carry2->shiftLeft(21));
+        $carry3 = $s3->shiftRight(21);
+        $s4 = $s4->addInt64($carry3);
+        $s3 = $s3->subInt64($carry3->shiftLeft(21));
+        $carry4 = $s4->shiftRight(21);
+        $s5 = $s5->addInt64($carry4);
+        $s4 = $s4->subInt64($carry4->shiftLeft(21));
+        $carry5 = $s5->shiftRight(21);
+        $s6 = $s6->addInt64($carry5);
+        $s5 = $s5->subInt64($carry5->shiftLeft(21));
+        $carry6 = $s6->shiftRight(21);
+        $s7 = $s7->addInt64($carry6);
+        $s6 = $s6->subInt64($carry6->shiftLeft(21));
+        $carry7 = $s7->shiftRight(21);
+        $s8 = $s8->addInt64($carry7);
+        $s7 = $s7->subInt64($carry7->shiftLeft(21));
+        $carry8 = $s10->shiftRight(21);
+        $s9 = $s9->addInt64($carry8);
+        $s8 = $s8->subInt64($carry8->shiftLeft(21));
+        $carry9 = $s9->shiftRight(21);
+        $s10 = $s10->addInt64($carry9);
+        $s9 = $s9->subInt64($carry9->shiftLeft(21));
+        $carry10 = $s10->shiftRight(21);
+        $s11 = $s11->addInt64($carry10);
+        $s10 = $s10->subInt64($carry10->shiftLeft(21));
+
+        $S0  =  $s0->toInt();
+        $S1  =  $s1->toInt();
+        $S2  =  $s2->toInt();
+        $S3  =  $s3->toInt();
+        $S4  =  $s4->toInt();
+        $S5  =  $s5->toInt();
+        $S6  =  $s6->toInt();
+        $S7  =  $s7->toInt();
+        $S8  =  $s8->toInt();
+        $S9  =  $s9->toInt();
+        $S10 = $s10->toInt();
+        $S11 = $s11->toInt();
+
+        /**
+         * @var array<int, int>
+         */
+        $arr = array(
+            (int) (0xff & ($S0 >> 0)),
+            (int) (0xff & ($S0 >> 8)),
+            (int) (0xff & (($S0 >> 16) | ($S1 << 5))),
+            (int) (0xff & ($S1 >> 3)),
+            (int) (0xff & ($S1 >> 11)),
+            (int) (0xff & (($S1 >> 19) | ($S2 << 2))),
+            (int) (0xff & ($S2 >> 6)),
+            (int) (0xff & (($S2 >> 14) | ($S3 << 7))),
+            (int) (0xff & ($S3 >> 1)),
+            (int) (0xff & ($S3 >> 9)),
+            (int) (0xff & (($S3 >> 17) | ($S4 << 4))),
+            (int) (0xff & ($S4 >> 4)),
+            (int) (0xff & ($S4 >> 12)),
+            (int) (0xff & (($S4 >> 20) | ($S5 << 1))),
+            (int) (0xff & ($S5 >> 7)),
+            (int) (0xff & (($S5 >> 15) | ($S6 << 6))),
+            (int) (0xff & ($S6 >> 2)),
+            (int) (0xff & ($S6 >> 10)),
+            (int) (0xff & (($S6 >> 18) | ($S7 << 3))),
+            (int) (0xff & ($S7 >> 5)),
+            (int) (0xff & ($S7 >> 13)),
+            (int) (0xff & ($S8 >> 0)),
+            (int) (0xff & ($S8 >> 8)),
+            (int) (0xff & (($S8 >> 16) | ($S9 << 5))),
+            (int) (0xff & ($S9 >> 3)),
+            (int) (0xff & ($S9 >> 11)),
+            (int) (0xff & (($S9 >> 19) | ($S10 << 2))),
+            (int) (0xff & ($S10 >> 6)),
+            (int) (0xff & (($S10 >> 14) | ($S11 << 7))),
+            (int) (0xff & ($S11 >> 1)),
+            (int) (0xff & ($S11 >> 9)),
+            (int) (0xff & ($S11 >> 17))
+        );
+        return self::intArrayToString($arr);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $s
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function sc_reduce($s)
+    {
+        /**
+         * @var ParagonIE_Sodium_Core32_Int64 $s0
+         * @var ParagonIE_Sodium_Core32_Int64 $s1
+         * @var ParagonIE_Sodium_Core32_Int64 $s2
+         * @var ParagonIE_Sodium_Core32_Int64 $s3
+         * @var ParagonIE_Sodium_Core32_Int64 $s4
+         * @var ParagonIE_Sodium_Core32_Int64 $s5
+         * @var ParagonIE_Sodium_Core32_Int64 $s6
+         * @var ParagonIE_Sodium_Core32_Int64 $s7
+         * @var ParagonIE_Sodium_Core32_Int64 $s8
+         * @var ParagonIE_Sodium_Core32_Int64 $s9
+         * @var ParagonIE_Sodium_Core32_Int64 $s10
+         * @var ParagonIE_Sodium_Core32_Int64 $s11
+         * @var ParagonIE_Sodium_Core32_Int64 $s12
+         * @var ParagonIE_Sodium_Core32_Int64 $s13
+         * @var ParagonIE_Sodium_Core32_Int64 $s14
+         * @var ParagonIE_Sodium_Core32_Int64 $s15
+         * @var ParagonIE_Sodium_Core32_Int64 $s16
+         * @var ParagonIE_Sodium_Core32_Int64 $s17
+         * @var ParagonIE_Sodium_Core32_Int64 $s18
+         * @var ParagonIE_Sodium_Core32_Int64 $s19
+         * @var ParagonIE_Sodium_Core32_Int64 $s20
+         * @var ParagonIE_Sodium_Core32_Int64 $s21
+         * @var ParagonIE_Sodium_Core32_Int64 $s22
+         * @var ParagonIE_Sodium_Core32_Int64 $s23
+         */
+        $s0 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & self::load_3(self::substr($s, 0, 3)));
+        $s1 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_4(self::substr($s, 2, 4)) >> 5));
+        $s2 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_3(self::substr($s, 5, 3)) >> 2));
+        $s3 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_4(self::substr($s, 7, 4)) >> 7));
+        $s4 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_4(self::substr($s, 10, 4)) >> 4));
+        $s5 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_3(self::substr($s, 13, 3)) >> 1));
+        $s6 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_4(self::substr($s, 15, 4)) >> 6));
+        $s7 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_3(self::substr($s, 18, 4)) >> 3));
+        $s8 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & self::load_3(self::substr($s, 21, 3)));
+        $s9 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_4(self::substr($s, 23, 4)) >> 5));
+        $s10 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_3(self::substr($s, 26, 3)) >> 2));
+        $s11 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_4(self::substr($s, 28, 4)) >> 7));
+        $s12 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_4(self::substr($s, 31, 4)) >> 4));
+        $s13 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_3(self::substr($s, 34, 3)) >> 1));
+        $s14 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_4(self::substr($s, 36, 4)) >> 6));
+        $s15 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_3(self::substr($s, 39, 4)) >> 3));
+        $s16 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & self::load_3(self::substr($s, 42, 3)));
+        $s17 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_4(self::substr($s, 44, 4)) >> 5));
+        $s18 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_3(self::substr($s, 47, 3)) >> 2));
+        $s19 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_4(self::substr($s, 49, 4)) >> 7));
+        $s20 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_4(self::substr($s, 52, 4)) >> 4));
+        $s21 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_3(self::substr($s, 55, 3)) >> 1));
+        $s22 = ParagonIE_Sodium_Core32_Int64::fromInt(2097151 & (self::load_4(self::substr($s, 57, 4)) >> 6));
+        $s23 = ParagonIE_Sodium_Core32_Int64::fromInt(0x1fffffff & (self::load_4(self::substr($s, 60, 4)) >> 3));
+
+        $s11 = $s11->addInt64($s23->mulInt(666643, 20));
+        $s12 = $s12->addInt64($s23->mulInt(470296, 19));
+        $s13 = $s13->addInt64($s23->mulInt(654183, 20));
+        $s14 = $s14->subInt64($s23->mulInt(997805, 20));
+        $s15 = $s15->addInt64($s23->mulInt(136657, 18));
+        $s16 = $s16->subInt64($s23->mulInt(683901, 20));
+
+        $s10 = $s10->addInt64($s22->mulInt(666643, 20));
+        $s11 = $s11->addInt64($s22->mulInt(470296, 19));
+        $s12 = $s12->addInt64($s22->mulInt(654183, 20));
+        $s13 = $s13->subInt64($s22->mulInt(997805, 20));
+        $s14 = $s14->addInt64($s22->mulInt(136657, 18));
+        $s15 = $s15->subInt64($s22->mulInt(683901, 20));
+
+        $s9  =  $s9->addInt64($s21->mulInt(666643, 20));
+        $s10 = $s10->addInt64($s21->mulInt(470296, 19));
+        $s11 = $s11->addInt64($s21->mulInt(654183, 20));
+        $s12 = $s12->subInt64($s21->mulInt(997805, 20));
+        $s13 = $s13->addInt64($s21->mulInt(136657, 18));
+        $s14 = $s14->subInt64($s21->mulInt(683901, 20));
+
+        $s8  =  $s8->addInt64($s20->mulInt(666643, 20));
+        $s9  =  $s9->addInt64($s20->mulInt(470296, 19));
+        $s10 = $s10->addInt64($s20->mulInt(654183, 20));
+        $s11 = $s11->subInt64($s20->mulInt(997805, 20));
+        $s12 = $s12->addInt64($s20->mulInt(136657, 18));
+        $s13 = $s13->subInt64($s20->mulInt(683901, 20));
+
+        $s7  =  $s7->addInt64($s19->mulInt(666643, 20));
+        $s8  =  $s8->addInt64($s19->mulInt(470296, 19));
+        $s9  =  $s9->addInt64($s19->mulInt(654183, 20));
+        $s10 = $s10->subInt64($s19->mulInt(997805, 20));
+        $s11 = $s11->addInt64($s19->mulInt(136657, 18));
+        $s12 = $s12->subInt64($s19->mulInt(683901, 20));
+
+        $s6  =  $s6->addInt64($s18->mulInt(666643, 20));
+        $s7  =  $s7->addInt64($s18->mulInt(470296, 19));
+        $s8  =  $s8->addInt64($s18->mulInt(654183, 20));
+        $s9  =  $s9->subInt64($s18->mulInt(997805, 20));
+        $s10 = $s10->addInt64($s18->mulInt(136657, 18));
+        $s11 = $s11->subInt64($s18->mulInt(683901, 20));
+
+        $carry6 = $s6->addInt(1 << 20)->shiftRight(21);
+        $s7 = $s7->addInt64($carry6);
+        $s6 = $s6->subInt64($carry6->shiftLeft(21));
+        $carry8 = $s8->addInt(1 << 20)->shiftRight(21);
+        $s9 = $s9->addInt64($carry8);
+        $s8 = $s8->subInt64($carry8->shiftLeft(21));
+        $carry10 = $s10->addInt(1 << 20)->shiftRight(21);
+        $s11 = $s11->addInt64($carry10);
+        $s10 = $s10->subInt64($carry10->shiftLeft(21));
+        $carry12 = $s12->addInt(1 << 20)->shiftRight(21);
+        $s13 = $s13->addInt64($carry12);
+        $s12 = $s12->subInt64($carry12->shiftLeft(21));
+        $carry14 = $s14->addInt(1 << 20)->shiftRight(21);
+        $s15 = $s15->addInt64($carry14);
+        $s14 = $s14->subInt64($carry14->shiftLeft(21));
+        $carry16 = $s16->addInt(1 << 20)->shiftRight(21);
+        $s17 = $s17->addInt64($carry16);
+        $s16 = $s16->subInt64($carry16->shiftLeft(21));
+
+        $carry7 = $s7->addInt(1 << 20)->shiftRight(21);
+        $s8 = $s8->addInt64($carry7);
+        $s7 = $s7->subInt64($carry7->shiftLeft(21));
+        $carry9 = $s9->addInt(1 << 20)->shiftRight(21);
+        $s10 = $s10->addInt64($carry9);
+        $s9 = $s9->subInt64($carry9->shiftLeft(21));
+        $carry11 = $s11->addInt(1 << 20)->shiftRight(21);
+        $s12 = $s12->addInt64($carry11);
+        $s11 = $s11->subInt64($carry11->shiftLeft(21));
+        $carry13 = $s13->addInt(1 << 20)->shiftRight(21);
+        $s14 = $s14->addInt64($carry13);
+        $s13 = $s13->subInt64($carry13->shiftLeft(21));
+        $carry15 = $s15->addInt(1 << 20)->shiftRight(21);
+        $s16 = $s16->addInt64($carry15);
+        $s15 = $s15->subInt64($carry15->shiftLeft(21));
+
+        $s5  =  $s5->addInt64($s17->mulInt(666643, 20));
+        $s6  =  $s6->addInt64($s17->mulInt(470296, 19));
+        $s7  =  $s7->addInt64($s17->mulInt(654183, 20));
+        $s8  =  $s8->subInt64($s17->mulInt(997805, 20));
+        $s9  =  $s9->addInt64($s17->mulInt(136657, 18));
+        $s10 = $s10->subInt64($s17->mulInt(683901, 20));
+
+        $s4  =  $s4->addInt64($s16->mulInt(666643, 20));
+        $s5  =  $s5->addInt64($s16->mulInt(470296, 19));
+        $s6  =  $s6->addInt64($s16->mulInt(654183, 20));
+        $s7  =  $s7->subInt64($s16->mulInt(997805, 20));
+        $s8  =  $s8->addInt64($s16->mulInt(136657, 18));
+        $s9  =  $s9->subInt64($s16->mulInt(683901, 20));
+
+        $s3  =  $s3->addInt64($s15->mulInt(666643, 20));
+        $s4  =  $s4->addInt64($s15->mulInt(470296, 19));
+        $s5  =  $s5->addInt64($s15->mulInt(654183, 20));
+        $s6  =  $s6->subInt64($s15->mulInt(997805, 20));
+        $s7  =  $s7->addInt64($s15->mulInt(136657, 18));
+        $s8  =  $s8->subInt64($s15->mulInt(683901, 20));
+
+        $s2  =  $s2->addInt64($s14->mulInt(666643, 20));
+        $s3  =  $s3->addInt64($s14->mulInt(470296, 19));
+        $s4  =  $s4->addInt64($s14->mulInt(654183, 20));
+        $s5  =  $s5->subInt64($s14->mulInt(997805, 20));
+        $s6  =  $s6->addInt64($s14->mulInt(136657, 18));
+        $s7  =  $s7->subInt64($s14->mulInt(683901, 20));
+
+        $s1  =  $s1->addInt64($s13->mulInt(666643, 20));
+        $s2  =  $s2->addInt64($s13->mulInt(470296, 19));
+        $s3  =  $s3->addInt64($s13->mulInt(654183, 20));
+        $s4  =  $s4->subInt64($s13->mulInt(997805, 20));
+        $s5  =  $s5->addInt64($s13->mulInt(136657, 18));
+        $s6  =  $s6->subInt64($s13->mulInt(683901, 20));
+
+        $s0  =  $s0->addInt64($s12->mulInt(666643, 20));
+        $s1  =  $s1->addInt64($s12->mulInt(470296, 19));
+        $s2  =  $s2->addInt64($s12->mulInt(654183, 20));
+        $s3  =  $s3->subInt64($s12->mulInt(997805, 20));
+        $s4  =  $s4->addInt64($s12->mulInt(136657, 18));
+        $s5  =  $s5->subInt64($s12->mulInt(683901, 20));
+        $s12 = new ParagonIE_Sodium_Core32_Int64();
+
+        $carry0 = $s0->addInt(1 << 20)->shiftRight(21);
+        $s1 = $s1->addInt64($carry0);
+        $s0 = $s0->subInt64($carry0->shiftLeft(21));
+        $carry2 = $s2->addInt(1 << 20)->shiftRight(21);
+        $s3 = $s3->addInt64($carry2);
+        $s2 = $s2->subInt64($carry2->shiftLeft(21));
+        $carry4 = $s4->addInt(1 << 20)->shiftRight(21);
+        $s5 = $s5->addInt64($carry4);
+        $s4 = $s4->subInt64($carry4->shiftLeft(21));
+        $carry6 = $s6->addInt(1 << 20)->shiftRight(21);
+        $s7 = $s7->addInt64($carry6);
+        $s6 = $s6->subInt64($carry6->shiftLeft(21));
+        $carry8 = $s8->addInt(1 << 20)->shiftRight(21);
+        $s9 = $s9->addInt64($carry8);
+        $s8 = $s8->subInt64($carry8->shiftLeft(21));
+        $carry10 = $s10->addInt(1 << 20)->shiftRight(21);
+        $s11 = $s11->addInt64($carry10);
+        $s10 = $s10->subInt64($carry10->shiftLeft(21));
+        $carry1 = $s1->addInt(1 << 20)->shiftRight(21);
+        $s2 = $s2->addInt64($carry1);
+        $s1 = $s1->subInt64($carry1->shiftLeft(21));
+        $carry3 = $s3->addInt(1 << 20)->shiftRight(21);
+        $s4 = $s4->addInt64($carry3);
+        $s3 = $s3->subInt64($carry3->shiftLeft(21));
+        $carry5 = $s5->addInt(1 << 20)->shiftRight(21);
+        $s6 = $s6->addInt64($carry5);
+        $s5 = $s5->subInt64($carry5->shiftLeft(21));
+        $carry7 = $s7->addInt(1 << 20)->shiftRight(21);
+        $s8 = $s8->addInt64($carry7);
+        $s7 = $s7->subInt64($carry7->shiftLeft(21));
+        $carry9 = $s9->addInt(1 << 20)->shiftRight(21);
+        $s10 = $s10->addInt64($carry9);
+        $s9 = $s9->subInt64($carry9->shiftLeft(21));
+        $carry11 = $s11->addInt(1 << 20)->shiftRight(21);
+        $s12 = $s12->addInt64($carry11);
+        $s11 = $s11->subInt64($carry11->shiftLeft(21));
+
+        $s0  =  $s0->addInt64($s12->mulInt(666643, 20));
+        $s1  =  $s1->addInt64($s12->mulInt(470296, 19));
+        $s2  =  $s2->addInt64($s12->mulInt(654183, 20));
+        $s3  =  $s3->subInt64($s12->mulInt(997805, 20));
+        $s4  =  $s4->addInt64($s12->mulInt(136657, 18));
+        $s5  =  $s5->subInt64($s12->mulInt(683901, 20));
+        $s12 = new ParagonIE_Sodium_Core32_Int64();
+
+        $carry0 = $s0->shiftRight(21);
+        $s1 = $s1->addInt64($carry0);
+        $s0 = $s0->subInt64($carry0->shiftLeft(21));
+        $carry1 = $s1->shiftRight(21);
+        $s2 = $s2->addInt64($carry1);
+        $s1 = $s1->subInt64($carry1->shiftLeft(21));
+        $carry2 = $s2->shiftRight(21);
+        $s3 = $s3->addInt64($carry2);
+        $s2 = $s2->subInt64($carry2->shiftLeft(21));
+        $carry3 = $s3->shiftRight(21);
+        $s4 = $s4->addInt64($carry3);
+        $s3 = $s3->subInt64($carry3->shiftLeft(21));
+        $carry4 = $s4->shiftRight(21);
+        $s5 = $s5->addInt64($carry4);
+        $s4 = $s4->subInt64($carry4->shiftLeft(21));
+        $carry5 = $s5->shiftRight(21);
+        $s6 = $s6->addInt64($carry5);
+        $s5 = $s5->subInt64($carry5->shiftLeft(21));
+        $carry6 = $s6->shiftRight(21);
+        $s7 = $s7->addInt64($carry6);
+        $s6 = $s6->subInt64($carry6->shiftLeft(21));
+        $carry7 = $s7->shiftRight(21);
+        $s8 = $s8->addInt64($carry7);
+        $s7 = $s7->subInt64($carry7->shiftLeft(21));
+        $carry8 = $s8->shiftRight(21);
+        $s9 = $s9->addInt64($carry8);
+        $s8 = $s8->subInt64($carry8->shiftLeft(21));
+        $carry9 = $s9->shiftRight(21);
+        $s10 = $s10->addInt64($carry9);
+        $s9 = $s9->subInt64($carry9->shiftLeft(21));
+        $carry10 = $s10->shiftRight(21);
+        $s11 = $s11->addInt64($carry10);
+        $s10 = $s10->subInt64($carry10->shiftLeft(21));
+        $carry11 = $s11->shiftRight(21);
+        $s12 = $s12->addInt64($carry11);
+        $s11 = $s11->subInt64($carry11->shiftLeft(21));
+
+        $s0  =  $s0->addInt64($s12->mulInt(666643, 20));
+        $s1  =  $s1->addInt64($s12->mulInt(470296, 19));
+        $s2  =  $s2->addInt64($s12->mulInt(654183, 20));
+        $s3  =  $s3->subInt64($s12->mulInt(997805, 20));
+        $s4  =  $s4->addInt64($s12->mulInt(136657, 18));
+        $s5  =  $s5->subInt64($s12->mulInt(683901, 20));
+
+        $carry0 = $s0->shiftRight(21);
+        $s1 = $s1->addInt64($carry0);
+        $s0 = $s0->subInt64($carry0->shiftLeft(21));
+        $carry1 = $s1->shiftRight(21);
+        $s2 = $s2->addInt64($carry1);
+        $s1 = $s1->subInt64($carry1->shiftLeft(21));
+        $carry2 = $s2->shiftRight(21);
+        $s3 = $s3->addInt64($carry2);
+        $s2 = $s2->subInt64($carry2->shiftLeft(21));
+        $carry3 = $s3->shiftRight(21);
+        $s4 = $s4->addInt64($carry3);
+        $s3 = $s3->subInt64($carry3->shiftLeft(21));
+        $carry4 = $s4->shiftRight(21);
+        $s5 = $s5->addInt64($carry4);
+        $s4 = $s4->subInt64($carry4->shiftLeft(21));
+        $carry5 = $s5->shiftRight(21);
+        $s6 = $s6->addInt64($carry5);
+        $s5 = $s5->subInt64($carry5->shiftLeft(21));
+        $carry6 = $s6->shiftRight(21);
+        $s7 = $s7->addInt64($carry6);
+        $s6 = $s6->subInt64($carry6->shiftLeft(21));
+        $carry7 = $s7->shiftRight(21);
+        $s8 = $s8->addInt64($carry7);
+        $s7 = $s7->subInt64($carry7->shiftLeft(21));
+        $carry8 = $s8->shiftRight(21);
+        $s9 = $s9->addInt64($carry8);
+        $s8 = $s8->subInt64($carry8->shiftLeft(21));
+        $carry9 = $s9->shiftRight(21);
+        $s10 = $s10->addInt64($carry9);
+        $s9 = $s9->subInt64($carry9->shiftLeft(21));
+        $carry10 = $s10->shiftRight(21);
+        $s11 = $s11->addInt64($carry10);
+        $s10 = $s10->subInt64($carry10->shiftLeft(21));
+
+        $S0 = $s0->toInt32()->toInt();
+        $S1 = $s1->toInt32()->toInt();
+        $S2 = $s2->toInt32()->toInt();
+        $S3 = $s3->toInt32()->toInt();
+        $S4 = $s4->toInt32()->toInt();
+        $S5 = $s5->toInt32()->toInt();
+        $S6 = $s6->toInt32()->toInt();
+        $S7 = $s7->toInt32()->toInt();
+        $S8 = $s8->toInt32()->toInt();
+        $S9 = $s9->toInt32()->toInt();
+        $S10 = $s10->toInt32()->toInt();
+        $S11 = $s11->toInt32()->toInt();
+
+        /**
+         * @var array<int, int>
+         */
+        $arr = array(
+            (int) ($S0 >> 0),
+            (int) ($S0 >> 8),
+            (int) (($S0 >> 16) | ($S1 << 5)),
+            (int) ($S1 >> 3),
+            (int) ($S1 >> 11),
+            (int) (($S1 >> 19) | ($S2 << 2)),
+            (int) ($S2 >> 6),
+            (int) (($S2 >> 14) | ($S3 << 7)),
+            (int) ($S3 >> 1),
+            (int) ($S3 >> 9),
+            (int) (($S3 >> 17) | ($S4 << 4)),
+            (int) ($S4 >> 4),
+            (int) ($S4 >> 12),
+            (int) (($S4 >> 20) | ($S5 << 1)),
+            (int) ($S5 >> 7),
+            (int) (($S5 >> 15) | ($S6 << 6)),
+            (int) ($S6 >> 2),
+            (int) ($S6 >> 10),
+            (int) (($S6 >> 18) | ($S7 << 3)),
+            (int) ($S7 >> 5),
+            (int) ($S7 >> 13),
+            (int) ($S8 >> 0),
+            (int) ($S8 >> 8),
+            (int) (($S8 >> 16) | ($S9 << 5)),
+            (int) ($S9 >> 3),
+            (int) ($S9 >> 11),
+            (int) (($S9 >> 19) | ($S10 << 2)),
+            (int) ($S10 >> 6),
+            (int) (($S10 >> 14) | ($S11 << 7)),
+            (int) ($S11 >> 1),
+            (int) ($S11 >> 9),
+            (int) $S11 >> 17
+        );
+        return self::intArrayToString($arr);
+    }
+
+    /**
+     * multiply by the order of the main subgroup l = 2^252+27742317777372353535851937790883648493
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Ge_P3 $A
+     * @return ParagonIE_Sodium_Core32_Curve25519_Ge_P3
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function ge_mul_l(ParagonIE_Sodium_Core32_Curve25519_Ge_P3 $A)
+    {
+        /** @var array<int, int> $aslide */
+        $aslide = array(
+            13, 0, 0, 0, 0, -1, 0, 0, 0, 0, -11, 0, 0, 0, 0, 0, 0, -5, 0, 0, 0,
+            0, 0, 0, -3, 0, 0, 0, 0, -13, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 3, 0,
+            0, 0, 0, -13, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 0, 11, 0, 0, 0,
+            0, 0, 11, 0, 0, 0, 0, -13, 0, 0, 0, 0, 0, 0, -3, 0, 0, 0, 0, 0, -1,
+            0, 0, 0, 0, 3, 0, 0, 0, 0, -11, 0, 0, 0, 0, 0, 0, 0, 15, 0, 0, 0,
+            0, 0, -1, 0, 0, 0, 0, -1, 0, 0, 0, 0, 7, 0, 0, 0, 0, 5, 0, 0, 0, 0,
+            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
+        );
+
+        /** @var array<int, ParagonIE_Sodium_Core32_Curve25519_Ge_Cached> $Ai size 8 */
+        $Ai = array();
+
+        # ge_p3_to_cached(&Ai[0], A);
+        $Ai[0] = self::ge_p3_to_cached($A);
+        # ge_p3_dbl(&t, A);
+        $t = self::ge_p3_dbl($A);
+        # ge_p1p1_to_p3(&A2, &t);
+        $A2 = self::ge_p1p1_to_p3($t);
+
+        for ($i = 1; $i < 8; ++$i) {
+            # ge_add(&t, &A2, &Ai[0]);
+            $t = self::ge_add($A2, $Ai[$i - 1]);
+            # ge_p1p1_to_p3(&u, &t);
+            $u = self::ge_p1p1_to_p3($t);
+            # ge_p3_to_cached(&Ai[i], &u);
+            $Ai[$i] = self::ge_p3_to_cached($u);
+        }
+
+        $r = self::ge_p3_0();
+        for ($i = 252; $i >= 0; --$i) {
+            $t = self::ge_p3_dbl($r);
+            if ($aslide[$i] > 0) {
+                # ge_p1p1_to_p3(&u, &t);
+                $u = self::ge_p1p1_to_p3($t);
+                # ge_add(&t, &u, &Ai[aslide[i] / 2]);
+                $t = self::ge_add($u, $Ai[(int)($aslide[$i] / 2)]);
+            } elseif ($aslide[$i] < 0) {
+                # ge_p1p1_to_p3(&u, &t);
+                $u = self::ge_p1p1_to_p3($t);
+                # ge_sub(&t, &u, &Ai[(-aslide[i]) / 2]);
+                $t = self::ge_sub($u, $Ai[(int)(-$aslide[$i] / 2)]);
+            }
+        }
+        # ge_p1p1_to_p3(r, &t);
+        return self::ge_p1p1_to_p3($t);
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core32/Curve25519/Fe.php b/vendor/paragonie/sodium_compat/src/Core32/Curve25519/Fe.php
new file mode 100644
index 0000000..5fe10f7
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core32/Curve25519/Fe.php
@@ -0,0 +1,185 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core32_Curve25519_Fe', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core32_Curve25519_Fe
+ *
+ * This represents a Field Element
+ */
+class ParagonIE_Sodium_Core32_Curve25519_Fe implements ArrayAccess
+{
+    /**
+     * @var array<int, ParagonIE_Sodium_Core32_Int32>
+     */
+    protected $container = array();
+
+    /**
+     * @var int
+     */
+    protected $size = 10;
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param array<int, ParagonIE_Sodium_Core32_Int32> $array
+     * @param bool $save_indexes
+     * @return self
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function fromArray($array, $save_indexes = null)
+    {
+        $count = count($array);
+        if ($save_indexes) {
+            $keys = array_keys($array);
+        } else {
+            $keys = range(0, $count - 1);
+        }
+        $array = array_values($array);
+
+        $obj = new ParagonIE_Sodium_Core32_Curve25519_Fe();
+        if ($save_indexes) {
+            for ($i = 0; $i < $count; ++$i) {
+                $array[$i]->overflow = 0;
+                $obj->offsetSet($keys[$i], $array[$i]);
+            }
+        } else {
+            for ($i = 0; $i < $count; ++$i) {
+                $array[$i]->overflow = 0;
+                $obj->offsetSet($i, $array[$i]);
+            }
+        }
+        return $obj;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param array<int, int> $array
+     * @param bool $save_indexes
+     * @return self
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function fromIntArray($array, $save_indexes = null)
+    {
+        $count = count($array);
+        if ($save_indexes) {
+            $keys = array_keys($array);
+        } else {
+            $keys = range(0, $count - 1);
+        }
+        $array = array_values($array);
+        $set = array();
+        /** @var int $i */
+        /** @var int $v */
+        foreach ($array as $i => $v) {
+            $set[$i] = ParagonIE_Sodium_Core32_Int32::fromInt($v);
+        }
+
+        $obj = new ParagonIE_Sodium_Core32_Curve25519_Fe();
+        if ($save_indexes) {
+            for ($i = 0; $i < $count; ++$i) {
+                $set[$i]->overflow = 0;
+                $obj->offsetSet($keys[$i], $set[$i]);
+            }
+        } else {
+            for ($i = 0; $i < $count; ++$i) {
+                $set[$i]->overflow = 0;
+                $obj->offsetSet($i, $set[$i]);
+            }
+        }
+        return $obj;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param mixed $offset
+     * @param mixed $value
+     * @return void
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public function offsetSet($offset, $value)
+    {
+        if (!($value instanceof ParagonIE_Sodium_Core32_Int32)) {
+            throw new InvalidArgumentException('Expected an instance of ParagonIE_Sodium_Core32_Int32');
+        }
+        if (is_null($offset)) {
+            $this->container[] = $value;
+        } else {
+            ParagonIE_Sodium_Core32_Util::declareScalarType($offset, 'int', 1);
+            $this->container[(int) $offset] = $value;
+        }
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param mixed $offset
+     * @return bool
+     * @psalm-suppress MixedArrayOffset
+     */
+    public function offsetExists($offset)
+    {
+        return isset($this->container[$offset]);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param mixed $offset
+     * @return void
+     * @psalm-suppress MixedArrayOffset
+     */
+    public function offsetUnset($offset)
+    {
+        unset($this->container[$offset]);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param mixed $offset
+     * @return ParagonIE_Sodium_Core32_Int32
+     * @psalm-suppress MixedArrayOffset
+     */
+    public function offsetGet($offset)
+    {
+        if (!isset($this->container[$offset])) {
+            $this->container[(int) $offset] = new ParagonIE_Sodium_Core32_Int32();
+        }
+        /** @var ParagonIE_Sodium_Core32_Int32 $get */
+        $get = $this->container[$offset];
+        return $get;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @return array
+     */
+    public function __debugInfo()
+    {
+        if (empty($this->container)) {
+            return array();
+        }
+        $c = array(
+            (int) ($this->container[0]->toInt()),
+            (int) ($this->container[1]->toInt()),
+            (int) ($this->container[2]->toInt()),
+            (int) ($this->container[3]->toInt()),
+            (int) ($this->container[4]->toInt()),
+            (int) ($this->container[5]->toInt()),
+            (int) ($this->container[6]->toInt()),
+            (int) ($this->container[7]->toInt()),
+            (int) ($this->container[8]->toInt()),
+            (int) ($this->container[9]->toInt())
+        );
+        return array(implode(', ', $c));
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core32/Curve25519/Ge/Cached.php b/vendor/paragonie/sodium_compat/src/Core32/Curve25519/Ge/Cached.php
new file mode 100644
index 0000000..970481f
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core32/Curve25519/Ge/Cached.php
@@ -0,0 +1,65 @@
+<?php
+
+
+if (class_exists('ParagonIE_Sodium_Core32_Curve25519_Ge_Cached', false)) {
+    return;
+}
+/**
+ * Class ParagonIE_Sodium_Core32_Curve25519_Ge_Cached
+ */
+class ParagonIE_Sodium_Core32_Curve25519_Ge_Cached
+{
+    /**
+     * @var ParagonIE_Sodium_Core32_Curve25519_Fe
+     */
+    public $YplusX;
+
+    /**
+     * @var ParagonIE_Sodium_Core32_Curve25519_Fe
+     */
+    public $YminusX;
+
+    /**
+     * @var ParagonIE_Sodium_Core32_Curve25519_Fe
+     */
+    public $Z;
+
+    /**
+     * @var ParagonIE_Sodium_Core32_Curve25519_Fe
+     */
+    public $T2d;
+
+    /**
+     * ParagonIE_Sodium_Core32_Curve25519_Ge_Cached constructor.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe|null $YplusX
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe|null $YminusX
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe|null $Z
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe|null $T2d
+     */
+    public function __construct(
+        ParagonIE_Sodium_Core32_Curve25519_Fe $YplusX = null,
+        ParagonIE_Sodium_Core32_Curve25519_Fe $YminusX = null,
+        ParagonIE_Sodium_Core32_Curve25519_Fe $Z = null,
+        ParagonIE_Sodium_Core32_Curve25519_Fe $T2d = null
+    ) {
+        if ($YplusX === null) {
+            $YplusX = new ParagonIE_Sodium_Core32_Curve25519_Fe();
+        }
+        $this->YplusX = $YplusX;
+        if ($YminusX === null) {
+            $YminusX = new ParagonIE_Sodium_Core32_Curve25519_Fe();
+        }
+        $this->YminusX = $YminusX;
+        if ($Z === null) {
+            $Z = new ParagonIE_Sodium_Core32_Curve25519_Fe();
+        }
+        $this->Z = $Z;
+        if ($T2d === null) {
+            $T2d = new ParagonIE_Sodium_Core32_Curve25519_Fe();
+        }
+        $this->T2d = $T2d;
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core32/Curve25519/Ge/P1p1.php b/vendor/paragonie/sodium_compat/src/Core32/Curve25519/Ge/P1p1.php
new file mode 100644
index 0000000..ff10b1d
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core32/Curve25519/Ge/P1p1.php
@@ -0,0 +1,67 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core32_Curve25519_Ge_P1p1', false)) {
+    return;
+}
+/**
+ * Class ParagonIE_Sodium_Core32_Curve25519_Ge_P1p1
+ */
+class ParagonIE_Sodium_Core32_Curve25519_Ge_P1p1
+{
+    /**
+     * @var ParagonIE_Sodium_Core32_Curve25519_Fe
+     */
+    public $X;
+
+    /**
+     * @var ParagonIE_Sodium_Core32_Curve25519_Fe
+     */
+    public $Y;
+
+    /**
+     * @var ParagonIE_Sodium_Core32_Curve25519_Fe
+     */
+    public $Z;
+
+    /**
+     * @var ParagonIE_Sodium_Core32_Curve25519_Fe
+     */
+    public $T;
+
+    /**
+     * ParagonIE_Sodium_Core32_Curve25519_Ge_P1p1 constructor.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe|null $x
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe|null $y
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe|null $z
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe|null $t
+     *
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public function __construct(
+        ParagonIE_Sodium_Core32_Curve25519_Fe $x = null,
+        ParagonIE_Sodium_Core32_Curve25519_Fe $y = null,
+        ParagonIE_Sodium_Core32_Curve25519_Fe $z = null,
+        ParagonIE_Sodium_Core32_Curve25519_Fe $t = null
+    ) {
+        if ($x === null) {
+            $x = ParagonIE_Sodium_Core32_Curve25519::fe_0();
+        }
+        $this->X = $x;
+        if ($y === null) {
+            $y = ParagonIE_Sodium_Core32_Curve25519::fe_0();
+        }
+        $this->Y = $y;
+        if ($z === null) {
+            $z = ParagonIE_Sodium_Core32_Curve25519::fe_0();
+        }
+        $this->Z = $z;
+        if ($t === null) {
+            $t = ParagonIE_Sodium_Core32_Curve25519::fe_0();
+        }
+        $this->T = $t;
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core32/Curve25519/Ge/P2.php b/vendor/paragonie/sodium_compat/src/Core32/Curve25519/Ge/P2.php
new file mode 100644
index 0000000..8a45a91
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core32/Curve25519/Ge/P2.php
@@ -0,0 +1,54 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core32_Curve25519_Ge_P2', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core32_Curve25519_Ge_P2
+ */
+class ParagonIE_Sodium_Core32_Curve25519_Ge_P2
+{
+    /**
+     * @var ParagonIE_Sodium_Core32_Curve25519_Fe
+     */
+    public $X;
+
+    /**
+     * @var ParagonIE_Sodium_Core32_Curve25519_Fe
+     */
+    public $Y;
+
+    /**
+     * @var ParagonIE_Sodium_Core32_Curve25519_Fe
+     */
+    public $Z;
+
+    /**
+     * ParagonIE_Sodium_Core32_Curve25519_Ge_P2 constructor.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe|null $x
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe|null $y
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe|null $z
+     */
+    public function __construct(
+        ParagonIE_Sodium_Core32_Curve25519_Fe $x = null,
+        ParagonIE_Sodium_Core32_Curve25519_Fe $y = null,
+        ParagonIE_Sodium_Core32_Curve25519_Fe $z = null
+    ) {
+        if ($x === null) {
+            $x = new ParagonIE_Sodium_Core32_Curve25519_Fe();
+        }
+        $this->X = $x;
+        if ($y === null) {
+            $y = new ParagonIE_Sodium_Core32_Curve25519_Fe();
+        }
+        $this->Y = $y;
+        if ($z === null) {
+            $z = new ParagonIE_Sodium_Core32_Curve25519_Fe();
+        }
+        $this->Z = $z;
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core32/Curve25519/Ge/P3.php b/vendor/paragonie/sodium_compat/src/Core32/Curve25519/Ge/P3.php
new file mode 100644
index 0000000..c9e4b16
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core32/Curve25519/Ge/P3.php
@@ -0,0 +1,65 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core32_Curve25519_Ge_P3', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core32_Curve25519_Ge_P3
+ */
+class ParagonIE_Sodium_Core32_Curve25519_Ge_P3
+{
+    /**
+     * @var ParagonIE_Sodium_Core32_Curve25519_Fe
+     */
+    public $X;
+
+    /**
+     * @var ParagonIE_Sodium_Core32_Curve25519_Fe
+     */
+    public $Y;
+
+    /**
+     * @var ParagonIE_Sodium_Core32_Curve25519_Fe
+     */
+    public $Z;
+
+    /**
+     * @var ParagonIE_Sodium_Core32_Curve25519_Fe
+     */
+    public $T;
+
+    /**
+     * ParagonIE_Sodium_Core32_Curve25519_Ge_P3 constructor.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe|null $x
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe|null $y
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe|null $z
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe|null $t
+     */
+    public function __construct(
+        ParagonIE_Sodium_Core32_Curve25519_Fe $x = null,
+        ParagonIE_Sodium_Core32_Curve25519_Fe $y = null,
+        ParagonIE_Sodium_Core32_Curve25519_Fe $z = null,
+        ParagonIE_Sodium_Core32_Curve25519_Fe $t = null
+    ) {
+        if ($x === null) {
+            $x = new ParagonIE_Sodium_Core32_Curve25519_Fe();
+        }
+        $this->X = $x;
+        if ($y === null) {
+            $y = new ParagonIE_Sodium_Core32_Curve25519_Fe();
+        }
+        $this->Y = $y;
+        if ($z === null) {
+            $z = new ParagonIE_Sodium_Core32_Curve25519_Fe();
+        }
+        $this->Z = $z;
+        if ($t === null) {
+            $t = new ParagonIE_Sodium_Core32_Curve25519_Fe();
+        }
+        $this->T = $t;
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core32/Curve25519/Ge/Precomp.php b/vendor/paragonie/sodium_compat/src/Core32/Curve25519/Ge/Precomp.php
new file mode 100644
index 0000000..b590b75
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core32/Curve25519/Ge/Precomp.php
@@ -0,0 +1,56 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core32_Curve25519_Ge_Precomp', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core32_Curve25519_Ge_Precomp
+ */
+class ParagonIE_Sodium_Core32_Curve25519_Ge_Precomp
+{
+    /**
+     * @var ParagonIE_Sodium_Core32_Curve25519_Fe
+     */
+    public $yplusx;
+
+    /**
+     * @var ParagonIE_Sodium_Core32_Curve25519_Fe
+     */
+    public $yminusx;
+
+    /**
+     * @var ParagonIE_Sodium_Core32_Curve25519_Fe
+     */
+    public $xy2d;
+
+    /**
+     * ParagonIE_Sodium_Core32_Curve25519_Ge_Precomp constructor.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe $yplusx
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe $yminusx
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe $xy2d
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public function __construct(
+        ParagonIE_Sodium_Core32_Curve25519_Fe $yplusx = null,
+        ParagonIE_Sodium_Core32_Curve25519_Fe $yminusx = null,
+        ParagonIE_Sodium_Core32_Curve25519_Fe $xy2d = null
+    ) {
+        if ($yplusx === null) {
+            $yplusx = ParagonIE_Sodium_Core32_Curve25519::fe_0();
+        }
+        $this->yplusx = $yplusx;
+        if ($yminusx === null) {
+            $yminusx = ParagonIE_Sodium_Core32_Curve25519::fe_0();
+        }
+        $this->yminusx = $yminusx;
+        if ($xy2d === null) {
+            $xy2d = ParagonIE_Sodium_Core32_Curve25519::fe_0();
+        }
+        $this->xy2d = $xy2d;
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core32/Curve25519/H.php b/vendor/paragonie/sodium_compat/src/Core32/Curve25519/H.php
new file mode 100644
index 0000000..48c999a
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core32/Curve25519/H.php
@@ -0,0 +1,1467 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core32_Curve25519_H', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core32_Curve25519_H
+ *
+ * This just contains the constants in the ref10/base.h file
+ */
+class ParagonIE_Sodium_Core32_Curve25519_H extends ParagonIE_Sodium_Core32_Util
+{
+    /**
+     * See: libsodium's crypto_core/curve25519/ref10/base.h
+     *
+     * @var array<int, array<int, array<int, array<int, int>>>> Basically, int[32][8][3][10]
+     */
+    protected static $base = array(
+        array(
+            array(
+                array(25967493, -14356035, 29566456, 3660896, -12694345, 4014787, 27544626, -11754271, -6079156, 2047605),
+                array(-12545711, 934262, -2722910, 3049990, -727428, 9406986, 12720692, 5043384, 19500929, -15469378),
+                array(-8738181, 4489570, 9688441, -14785194, 10184609, -12363380, 29287919, 11864899, -24514362, -4438546),
+            ),
+            array(
+                array(-12815894, -12976347, -21581243, 11784320, -25355658, -2750717, -11717903, -3814571, -358445, -10211303),
+                array(-21703237, 6903825, 27185491, 6451973, -29577724, -9554005, -15616551, 11189268, -26829678, -5319081),
+                array(26966642, 11152617, 32442495, 15396054, 14353839, -12752335, -3128826, -9541118, -15472047, -4166697),
+            ),
+            array(
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+            ),
+            array(
+                array(-21433588, -12421821, 8119782, 7219913, -21830522, -9016134, -6679750, -12670638, 24350578, -13450001),
+                array(-4116307, -11271533, -23886186, 4843615, -30088339, 690623, -31536088, -10406836, 8317860, 12352766),
+                array(18200138, -14475911, -33087759, -2696619, -23702521, -9102511, -23552096, -2287550, 20712163, 6719373),
+            ),
+            array(
+                array(26656208, 6075253, -7858556, 1886072, -28344043, 4262326, 11117530, -3763210, 26224235, -3297458),
+                array(-17168938, -14854097, -3395676, -16369877, -19954045, 14050420, 21728352, 9493610, 18620611, -16428628),
+                array(-13323321, 13325349, 11432106, 5964811, 18609221, 6062965, -5269471, -9725556, -30701573, -16479657),
+            ),
+            array(
+                array(-23860538, -11233159, 26961357, 1640861, -32413112, -16737940, 12248509, -5240639, 13735342, 1934062),
+                array(25089769, 6742589, 17081145, -13406266, 21909293, -16067981, -15136294, -3765346, -21277997, 5473616),
+                array(31883677, -7961101, 1083432, -11572403, 22828471, 13290673, -7125085, 12469656, 29111212, -5451014),
+            ),
+            array(
+                array(24244947, -15050407, -26262976, 2791540, -14997599, 16666678, 24367466, 6388839, -10295587, 452383),
+                array(-25640782, -3417841, 5217916, 16224624, 19987036, -4082269, -24236251, -5915248, 15766062, 8407814),
+                array(-20406999, 13990231, 15495425, 16395525, 5377168, 15166495, -8917023, -4388953, -8067909, 2276718),
+            ),
+            array(
+                array(30157918, 12924066, -17712050, 9245753, 19895028, 3368142, -23827587, 5096219, 22740376, -7303417),
+                array(2041139, -14256350, 7783687, 13876377, -25946985, -13352459, 24051124, 13742383, -15637599, 13295222),
+                array(33338237, -8505733, 12532113, 7977527, 9106186, -1715251, -17720195, -4612972, -4451357, -14669444),
+            ),
+            array(
+                array(-20045281, 5454097, -14346548, 6447146, 28862071, 1883651, -2469266, -4141880, 7770569, 9620597),
+                array(23208068, 7979712, 33071466, 8149229, 1758231, -10834995, 30945528, -1694323, -33502340, -14767970),
+                array(1439958, -16270480, -1079989, -793782, 4625402, 10647766, -5043801, 1220118, 30494170, -11440799),
+            ),
+            array(
+                array(-5037580, -13028295, -2970559, -3061767, 15640974, -6701666, -26739026, 926050, -1684339, -13333647),
+                array(13908495, -3549272, 30919928, -6273825, -21521863, 7989039, 9021034, 9078865, 3353509, 4033511),
+                array(-29663431, -15113610, 32259991, -344482, 24295849, -12912123, 23161163, 8839127, 27485041, 7356032),
+            ),
+        ),
+        array(
+            array(
+                array(9661027, 705443, 11980065, -5370154, -1628543, 14661173, -6346142, 2625015, 28431036, -16771834),
+                array(-23839233, -8311415, -25945511, 7480958, -17681669, -8354183, -22545972, 14150565, 15970762, 4099461),
+                array(29262576, 16756590, 26350592, -8793563, 8529671, -11208050, 13617293, -9937143, 11465739, 8317062),
+            ),
+            array(
+                array(-25493081, -6962928, 32500200, -9419051, -23038724, -2302222, 14898637, 3848455, 20969334, -5157516),
+                array(-20384450, -14347713, -18336405, 13884722, -33039454, 2842114, -21610826, -3649888, 11177095, 14989547),
+                array(-24496721, -11716016, 16959896, 2278463, 12066309, 10137771, 13515641, 2581286, -28487508, 9930240),
+            ),
+            array(
+                array(-17751622, -2097826, 16544300, -13009300, -15914807, -14949081, 18345767, -13403753, 16291481, -5314038),
+                array(-33229194, 2553288, 32678213, 9875984, 8534129, 6889387, -9676774, 6957617, 4368891, 9788741),
+                array(16660756, 7281060, -10830758, 12911820, 20108584, -8101676, -21722536, -8613148, 16250552, -11111103),
+            ),
+            array(
+                array(-19765507, 2390526, -16551031, 14161980, 1905286, 6414907, 4689584, 10604807, -30190403, 4782747),
+                array(-1354539, 14736941, -7367442, -13292886, 7710542, -14155590, -9981571, 4383045, 22546403, 437323),
+                array(31665577, -12180464, -16186830, 1491339, -18368625, 3294682, 27343084, 2786261, -30633590, -14097016),
+            ),
+            array(
+                array(-14467279, -683715, -33374107, 7448552, 19294360, 14334329, -19690631, 2355319, -19284671, -6114373),
+                array(15121312, -15796162, 6377020, -6031361, -10798111, -12957845, 18952177, 15496498, -29380133, 11754228),
+                array(-2637277, -13483075, 8488727, -14303896, 12728761, -1622493, 7141596, 11724556, 22761615, -10134141),
+            ),
+            array(
+                array(16918416, 11729663, -18083579, 3022987, -31015732, -13339659, -28741185, -12227393, 32851222, 11717399),
+                array(11166634, 7338049, -6722523, 4531520, -29468672, -7302055, 31474879, 3483633, -1193175, -4030831),
+                array(-185635, 9921305, 31456609, -13536438, -12013818, 13348923, 33142652, 6546660, -19985279, -3948376),
+            ),
+            array(
+                array(-32460596, 11266712, -11197107, -7899103, 31703694, 3855903, -8537131, -12833048, -30772034, -15486313),
+                array(-18006477, 12709068, 3991746, -6479188, -21491523, -10550425, -31135347, -16049879, 10928917, 3011958),
+                array(-6957757, -15594337, 31696059, 334240, 29576716, 14796075, -30831056, -12805180, 18008031, 10258577),
+            ),
+            array(
+                array(-22448644, 15655569, 7018479, -4410003, -30314266, -1201591, -1853465, 1367120, 25127874, 6671743),
+                array(29701166, -14373934, -10878120, 9279288, -17568, 13127210, 21382910, 11042292, 25838796, 4642684),
+                array(-20430234, 14955537, -24126347, 8124619, -5369288, -5990470, 30468147, -13900640, 18423289, 4177476),
+            ),
+        )
+    );
+
+    /**
+     * See: libsodium's crypto_core/curve25519/ref10/base2.h
+     *
+     * @var array<int, array<int, array<int, int>>> basically int[8][3]
+     */
+    protected static $base2 = array(
+        array(
+            array(25967493, -14356035, 29566456, 3660896, -12694345, 4014787, 27544626, -11754271, -6079156, 2047605),
+            array(-12545711, 934262, -2722910, 3049990, -727428, 9406986, 12720692, 5043384, 19500929, -15469378),
+            array(-8738181, 4489570, 9688441, -14785194, 10184609, -12363380, 29287919, 11864899, -24514362, -4438546),
+        ),
+        array(
+            array(15636291, -9688557, 24204773, -7912398, 616977, -16685262, 27787600, -14772189, 28944400, -1550024),
+            array(16568933, 4717097, -11556148, -1102322, 15682896, -11807043, 16354577, -11775962, 7689662, 11199574),
+            array(30464156, -5976125, -11779434, -15670865, 23220365, 15915852, 7512774, 10017326, -17749093, -9920357),
+        ),
+        array(
+            array(10861363, 11473154, 27284546, 1981175, -30064349, 12577861, 32867885, 14515107, -15438304, 10819380),
+            array(4708026, 6336745, 20377586, 9066809, -11272109, 6594696, -25653668, 12483688, -12668491, 5581306),
+            array(19563160, 16186464, -29386857, 4097519, 10237984, -4348115, 28542350, 13850243, -23678021, -15815942),
+        ),
+        array(
+            array(5153746, 9909285, 1723747, -2777874, 30523605, 5516873, 19480852, 5230134, -23952439, -15175766),
+            array(-30269007, -3463509, 7665486, 10083793, 28475525, 1649722, 20654025, 16520125, 30598449, 7715701),
+            array(28881845, 14381568, 9657904, 3680757, -20181635, 7843316, -31400660, 1370708, 29794553, -1409300),
+        ),
+        array(
+            array(-22518993, -6692182, 14201702, -8745502, -23510406, 8844726, 18474211, -1361450, -13062696, 13821877),
+            array(-6455177, -7839871, 3374702, -4740862, -27098617, -10571707, 31655028, -7212327, 18853322, -14220951),
+            array(4566830, -12963868, -28974889, -12240689, -7602672, -2830569, -8514358, -10431137, 2207753, -3209784),
+        ),
+        array(
+            array(-25154831, -4185821, 29681144, 7868801, -6854661, -9423865, -12437364, -663000, -31111463, -16132436),
+            array(25576264, -2703214, 7349804, -11814844, 16472782, 9300885, 3844789, 15725684, 171356, 6466918),
+            array(23103977, 13316479, 9739013, -16149481, 817875, -15038942, 8965339, -14088058, -30714912, 16193877),
+        ),
+        array(
+            array(-33521811, 3180713, -2394130, 14003687, -16903474, -16270840, 17238398, 4729455, -18074513, 9256800),
+            array(-25182317, -4174131, 32336398, 5036987, -21236817, 11360617, 22616405, 9761698, -19827198, 630305),
+            array(-13720693, 2639453, -24237460, -7406481, 9494427, -5774029, -6554551, -15960994, -2449256, -14291300),
+        ),
+        array(
+            array(-3151181, -5046075, 9282714, 6866145, -31907062, -863023, -18940575, 15033784, 25105118, -7894876),
+            array(-24326370, 15950226, -31801215, -14592823, -11662737, -5090925, 1573892, -2625887, 2198790, -15804619),
+            array(-3099351, 10324967, -2241613, 7453183, -5446979, -2735503, -13812022, -16236442, -32461234, -12290683),
+        )
+    );
+
+    /**
+     * 37095705934669439343138083508754565189542113879843219016388785533085940283555
+     *
+     * @var array<int, int>
+     */
+    protected static $d = array(
+        -10913610,
+        13857413,
+        -15372611,
+        6949391,
+        114729,
+        -8787816,
+        -6275908,
+        -3247719,
+        -18696448,
+        -12055116
+    );
+
+    /**
+     * 2 * d = 16295367250680780974490674513165176452449235426866156013048779062215315747161
+     *
+     * @var array<int, int>
+     */
+    protected static $d2 = array(
+        -21827239,
+        -5839606,
+        -30745221,
+        13898782,
+        229458,
+        15978800,
+        -12551817,
+        -6495438,
+        29715968,
+        9444199
+    );
+
+    /**
+     * sqrt(-1)
+     *
+     * @var array<int, int>
+     */
+    protected static $sqrtm1 = array(
+        -32595792,
+        -7943725,
+        9377950,
+        3500415,
+        12389472,
+        -272473,
+        -25146209,
+        -2005654,
+        326686,
+        11406482
+    );
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core32/Curve25519/README.md b/vendor/paragonie/sodium_compat/src/Core32/Curve25519/README.md
new file mode 100644
index 0000000..e8097fa
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core32/Curve25519/README.md
@@ -0,0 +1,3 @@
+# Curve25519 Data Structures
+
+These are PHP implementation of the [structs used in the ref10 curve25519 code](https://github.com/jedisct1/libsodium/blob/master/src/libsodium/include/sodium/private/curve25519_ref10.h).
diff --git a/vendor/paragonie/sodium_compat/src/Core32/Ed25519.php b/vendor/paragonie/sodium_compat/src/Core32/Ed25519.php
new file mode 100644
index 0000000..284ff14
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core32/Ed25519.php
@@ -0,0 +1,482 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core32_Ed25519', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core32_Ed25519
+ */
+abstract class ParagonIE_Sodium_Core32_Ed25519 extends ParagonIE_Sodium_Core32_Curve25519
+{
+    const KEYPAIR_BYTES = 96;
+    const SEED_BYTES = 32;
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @return string (96 bytes)
+     * @throws Exception
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function keypair()
+    {
+        $seed = random_bytes(self::SEED_BYTES);
+        $pk = '';
+        $sk = '';
+        self::seed_keypair($pk, $sk, $seed);
+        return $sk . $pk;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $pk
+     * @param string $sk
+     * @param string $seed
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function seed_keypair(&$pk, &$sk, $seed)
+    {
+        if (self::strlen($seed) !== self::SEED_BYTES) {
+            throw new RangeException('crypto_sign keypair seed must be 32 bytes long');
+        }
+
+        /** @var string $pk */
+        $pk = self::publickey_from_secretkey($seed);
+        $sk = $seed . $pk;
+        return $sk;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $keypair
+     * @return string
+     * @throws TypeError
+     */
+    public static function secretkey($keypair)
+    {
+        if (self::strlen($keypair) !== self::KEYPAIR_BYTES) {
+            throw new RangeException('crypto_sign keypair must be 96 bytes long');
+        }
+        return self::substr($keypair, 0, 64);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $keypair
+     * @return string
+     * @throws RangeException
+     * @throws TypeError
+     */
+    public static function publickey($keypair)
+    {
+        if (self::strlen($keypair) !== self::KEYPAIR_BYTES) {
+            throw new RangeException('crypto_sign keypair must be 96 bytes long');
+        }
+        return self::substr($keypair, 64, 32);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $sk
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function publickey_from_secretkey($sk)
+    {
+        /** @var string $sk */
+        $sk = hash('sha512', self::substr($sk, 0, 32), true);
+        $sk[0] = self::intToChr(
+            self::chrToInt($sk[0]) & 248
+        );
+        $sk[31] = self::intToChr(
+            (self::chrToInt($sk[31]) & 63) | 64
+        );
+        return self::sk_to_pk($sk);
+    }
+
+    /**
+     * @param string $pk
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function pk_to_curve25519($pk)
+    {
+        if (self::small_order($pk)) {
+            throw new SodiumException('Public key is on a small order');
+        }
+        $A = self::ge_frombytes_negate_vartime($pk);
+        $p1 = self::ge_mul_l($A);
+        if (!self::fe_isnonzero($p1->X)) {
+            throw new SodiumException('Unexpected zero result');
+        }
+
+        # fe_1(one_minus_y);
+        # fe_sub(one_minus_y, one_minus_y, A.Y);
+        # fe_invert(one_minus_y, one_minus_y);
+        $one_minux_y = self::fe_invert(
+            self::fe_sub(
+                self::fe_1(),
+                $A->Y
+            )
+        );
+
+
+        # fe_1(x);
+        # fe_add(x, x, A.Y);
+        # fe_mul(x, x, one_minus_y);
+        $x = self::fe_mul(
+            self::fe_add(self::fe_1(), $A->Y),
+            $one_minux_y
+        );
+
+        # fe_tobytes(curve25519_pk, x);
+        return self::fe_tobytes($x);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $sk
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function sk_to_pk($sk)
+    {
+        return self::ge_p3_tobytes(
+            self::ge_scalarmult_base(
+                self::substr($sk, 0, 32)
+            )
+        );
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $message
+     * @param string $sk
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function sign($message, $sk)
+    {
+        /** @var string $signature */
+        $signature = self::sign_detached($message, $sk);
+        return $signature . $message;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $message A signed message
+     * @param string $pk      Public key
+     * @return string         Message (without signature)
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function sign_open($message, $pk)
+    {
+        /** @var string $signature */
+        $signature = self::substr($message, 0, 64);
+
+        /** @var string $message */
+        $message = self::substr($message, 64);
+
+        if (self::verify_detached($signature, $message, $pk)) {
+            return $message;
+        }
+        throw new SodiumException('Invalid signature');
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $message
+     * @param string $sk
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress PossiblyInvalidArgument
+     */
+    public static function sign_detached($message, $sk)
+    {
+        # crypto_hash_sha512(az, sk, 32);
+        $az =  hash('sha512', self::substr($sk, 0, 32), true);
+
+        # az[0] &= 248;
+        # az[31] &= 63;
+        # az[31] |= 64;
+        $az[0] = self::intToChr(self::chrToInt($az[0]) & 248);
+        $az[31] = self::intToChr((self::chrToInt($az[31]) & 63) | 64);
+
+        # crypto_hash_sha512_init(&hs);
+        # crypto_hash_sha512_update(&hs, az + 32, 32);
+        # crypto_hash_sha512_update(&hs, m, mlen);
+        # crypto_hash_sha512_final(&hs, nonce);
+        $hs = hash_init('sha512');
+        self::hash_update($hs, self::substr($az, 32, 32));
+        self::hash_update($hs, $message);
+        $nonceHash = hash_final($hs, true);
+
+        # memmove(sig + 32, sk + 32, 32);
+        $pk = self::substr($sk, 32, 32);
+
+        # sc_reduce(nonce);
+        # ge_scalarmult_base(&R, nonce);
+        # ge_p3_tobytes(sig, &R);
+        $nonce = self::sc_reduce($nonceHash) . self::substr($nonceHash, 32);
+        $sig = self::ge_p3_tobytes(
+            self::ge_scalarmult_base($nonce)
+        );
+
+        # crypto_hash_sha512_init(&hs);
+        # crypto_hash_sha512_update(&hs, sig, 64);
+        # crypto_hash_sha512_update(&hs, m, mlen);
+        # crypto_hash_sha512_final(&hs, hram);
+        $hs = hash_init('sha512');
+        self::hash_update($hs, self::substr($sig, 0, 32));
+        self::hash_update($hs, self::substr($pk, 0, 32));
+        self::hash_update($hs, $message);
+        $hramHash = hash_final($hs, true);
+
+        # sc_reduce(hram);
+        # sc_muladd(sig + 32, hram, az, nonce);
+        $hram = self::sc_reduce($hramHash);
+        $sigAfter = self::sc_muladd($hram, $az, $nonce);
+        $sig = self::substr($sig, 0, 32) . self::substr($sigAfter, 0, 32);
+
+        try {
+            ParagonIE_Sodium_Compat::memzero($az);
+        } catch (SodiumException $ex) {
+            $az = null;
+        }
+        return $sig;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $sig
+     * @param string $message
+     * @param string $pk
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function verify_detached($sig, $message, $pk)
+    {
+        if (self::strlen($sig) < 64) {
+            throw new SodiumException('Signature is too short');
+        }
+        if ((self::chrToInt($sig[63]) & 240) && self::check_S_lt_L(self::substr($sig, 32, 32))) {
+            throw new SodiumException('S < L - Invalid signature');
+        }
+        if (self::small_order($sig)) {
+            throw new SodiumException('Signature is on too small of an order');
+        }
+        if ((self::chrToInt($sig[63]) & 224) !== 0) {
+            throw new SodiumException('Invalid signature');
+        }
+        $d = 0;
+        for ($i = 0; $i < 32; ++$i) {
+            $d |= self::chrToInt($pk[$i]);
+        }
+        if ($d === 0) {
+            throw new SodiumException('All zero public key');
+        }
+
+        /** @var bool The original value of ParagonIE_Sodium_Compat::$fastMult */
+        $orig = ParagonIE_Sodium_Compat::$fastMult;
+
+        // Set ParagonIE_Sodium_Compat::$fastMult to true to speed up verification.
+        ParagonIE_Sodium_Compat::$fastMult = true;
+
+        /** @var ParagonIE_Sodium_Core32_Curve25519_Ge_P3 $A */
+        $A = self::ge_frombytes_negate_vartime($pk);
+
+        /** @var string $hDigest */
+        $hDigest = hash(
+            'sha512',
+            self::substr($sig, 0, 32) .
+            self::substr($pk, 0, 32) .
+            $message,
+            true
+        );
+
+        /** @var string $h */
+        $h = self::sc_reduce($hDigest) . self::substr($hDigest, 32);
+
+        /** @var ParagonIE_Sodium_Core32_Curve25519_Ge_P2 $R */
+        $R = self::ge_double_scalarmult_vartime(
+            $h,
+            $A,
+            self::substr($sig, 32)
+        );
+
+        /** @var string $rcheck */
+        $rcheck = self::ge_tobytes($R);
+
+        // Reset ParagonIE_Sodium_Compat::$fastMult to what it was before.
+        ParagonIE_Sodium_Compat::$fastMult = $orig;
+
+        return self::verify_32($rcheck, self::substr($sig, 0, 32));
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $S
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function check_S_lt_L($S)
+    {
+        if (self::strlen($S) < 32) {
+            throw new SodiumException('Signature must be 32 bytes');
+        }
+        static $L = array(
+            0xed, 0xd3, 0xf5, 0x5c, 0x1a, 0x63, 0x12, 0x58,
+            0xd6, 0x9c, 0xf7, 0xa2, 0xde, 0xf9, 0xde, 0x14,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10
+        );
+        /** @var array<int, int> $L */
+        $c = 0;
+        $n = 1;
+        $i = 32;
+
+        do {
+            --$i;
+            $x = self::chrToInt($S[$i]);
+            $c |= (
+                (($x - $L[$i]) >> 8) & $n
+            );
+            $n &= (
+                (($x ^ $L[$i]) - 1) >> 8
+            );
+        } while ($i !== 0);
+
+        return $c === 0;
+    }
+
+    /**
+     * @param string $R
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function small_order($R)
+    {
+        static $blocklist = array(
+            /* 0 (order 4) */
+            array(
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+            ),
+            /* 1 (order 1) */
+            array(
+                0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+            ),
+            /* 2707385501144840649318225287225658788936804267575313519463743609750303402022 (order 8) */
+            array(
+                0x26, 0xe8, 0x95, 0x8f, 0xc2, 0xb2, 0x27, 0xb0,
+                0x45, 0xc3, 0xf4, 0x89, 0xf2, 0xef, 0x98, 0xf0,
+                0xd5, 0xdf, 0xac, 0x05, 0xd3, 0xc6, 0x33, 0x39,
+                0xb1, 0x38, 0x02, 0x88, 0x6d, 0x53, 0xfc, 0x05
+            ),
+            /* 55188659117513257062467267217118295137698188065244968500265048394206261417927 (order 8) */
+            array(
+                0xc7, 0x17, 0x6a, 0x70, 0x3d, 0x4d, 0xd8, 0x4f,
+                0xba, 0x3c, 0x0b, 0x76, 0x0d, 0x10, 0x67, 0x0f,
+                0x2a, 0x20, 0x53, 0xfa, 0x2c, 0x39, 0xcc, 0xc6,
+                0x4e, 0xc7, 0xfd, 0x77, 0x92, 0xac, 0x03, 0x7a
+            ),
+            /* p-1 (order 2) */
+            array(
+                0x13, 0xe8, 0x95, 0x8f, 0xc2, 0xb2, 0x27, 0xb0,
+                0x45, 0xc3, 0xf4, 0x89, 0xf2, 0xef, 0x98, 0xf0,
+                0xd5, 0xdf, 0xac, 0x05, 0xd3, 0xc6, 0x33, 0x39,
+                0xb1, 0x38, 0x02, 0x88, 0x6d, 0x53, 0xfc, 0x85
+            ),
+            /* p (order 4) */
+            array(
+                0xb4, 0x17, 0x6a, 0x70, 0x3d, 0x4d, 0xd8, 0x4f,
+                0xba, 0x3c, 0x0b, 0x76, 0x0d, 0x10, 0x67, 0x0f,
+                0x2a, 0x20, 0x53, 0xfa, 0x2c, 0x39, 0xcc, 0xc6,
+                0x4e, 0xc7, 0xfd, 0x77, 0x92, 0xac, 0x03, 0xfa
+            ),
+            /* p+1 (order 1) */
+            array(
+                0xec, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f
+            ),
+            /* p+2707385501144840649318225287225658788936804267575313519463743609750303402022 (order 8) */
+            array(
+                0xed, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f
+            ),
+            /* p+55188659117513257062467267217118295137698188065244968500265048394206261417927 (order 8) */
+            array(
+                0xee, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f
+            ),
+            /* 2p-1 (order 2) */
+            array(
+                0xd9, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
+            ),
+            /* 2p (order 4) */
+            array(
+                0xda, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
+            ),
+            /* 2p+1 (order 1) */
+            array(
+                0xdb, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
+            )
+        );
+        /** @var array<int, array<int, int>> $blocklist */
+        $countBlocklist = count($blocklist);
+
+        for ($i = 0; $i < $countBlocklist; ++$i) {
+            $c = 0;
+            for ($j = 0; $j < 32; ++$j) {
+                $c |= self::chrToInt($R[$j]) ^ $blocklist[$i][$j];
+            }
+            if ($c === 0) {
+                return true;
+            }
+        }
+        return false;
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core32/HChaCha20.php b/vendor/paragonie/sodium_compat/src/Core32/HChaCha20.php
new file mode 100644
index 0000000..551d995
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core32/HChaCha20.php
@@ -0,0 +1,127 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core32_HChaCha20', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core_HChaCha20
+ */
+class ParagonIE_Sodium_Core32_HChaCha20 extends ParagonIE_Sodium_Core32_ChaCha20
+{
+    /**
+     * @param string $in
+     * @param string $key
+     * @param string|null $c
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function hChaCha20($in = '', $key = '', $c = null)
+    {
+        $ctx = array();
+
+        if ($c === null) {
+            $ctx[0] = new ParagonIE_Sodium_Core32_Int32(array(0x6170, 0x7865));
+            $ctx[1] = new ParagonIE_Sodium_Core32_Int32(array(0x3320, 0x646e));
+            $ctx[2] = new ParagonIE_Sodium_Core32_Int32(array(0x7962, 0x2d32));
+            $ctx[3] = new ParagonIE_Sodium_Core32_Int32(array(0x6b20, 0x6574));
+        } else {
+            $ctx[0] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($c, 0, 4));
+            $ctx[1] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($c, 4, 4));
+            $ctx[2] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($c, 8, 4));
+            $ctx[3] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($c, 12, 4));
+        }
+        $ctx[4]  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 0, 4));
+        $ctx[5]  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 4, 4));
+        $ctx[6]  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 8, 4));
+        $ctx[7]  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 12, 4));
+        $ctx[8]  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 16, 4));
+        $ctx[9]  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 20, 4));
+        $ctx[10] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 24, 4));
+        $ctx[11] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 28, 4));
+        $ctx[12] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($in, 0, 4));
+        $ctx[13] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($in, 4, 4));
+        $ctx[14] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($in, 8, 4));
+        $ctx[15] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($in, 12, 4));
+
+        return self::hChaCha20Bytes($ctx);
+    }
+
+    /**
+     * @param array $ctx
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    protected static function hChaCha20Bytes(array $ctx)
+    {
+        /** @var ParagonIE_Sodium_Core32_Int32 $x0 */
+        $x0  = $ctx[0];
+        /** @var ParagonIE_Sodium_Core32_Int32 $x1 */
+        $x1  = $ctx[1];
+        /** @var ParagonIE_Sodium_Core32_Int32 $x2 */
+        $x2  = $ctx[2];
+        /** @var ParagonIE_Sodium_Core32_Int32 $x3 */
+        $x3  = $ctx[3];
+        /** @var ParagonIE_Sodium_Core32_Int32 $x4 */
+        $x4  = $ctx[4];
+        /** @var ParagonIE_Sodium_Core32_Int32 $x5 */
+        $x5  = $ctx[5];
+        /** @var ParagonIE_Sodium_Core32_Int32 $x6 */
+        $x6  = $ctx[6];
+        /** @var ParagonIE_Sodium_Core32_Int32 $x7 */
+        $x7  = $ctx[7];
+        /** @var ParagonIE_Sodium_Core32_Int32 $x8 */
+        $x8  = $ctx[8];
+        /** @var ParagonIE_Sodium_Core32_Int32 $x9 */
+        $x9  = $ctx[9];
+        /** @var ParagonIE_Sodium_Core32_Int32 $x10 */
+        $x10 = $ctx[10];
+        /** @var ParagonIE_Sodium_Core32_Int32 $x11 */
+        $x11 = $ctx[11];
+        /** @var ParagonIE_Sodium_Core32_Int32 $x12 */
+        $x12 = $ctx[12];
+        /** @var ParagonIE_Sodium_Core32_Int32 $x13 */
+        $x13 = $ctx[13];
+        /** @var ParagonIE_Sodium_Core32_Int32 $x14 */
+        $x14 = $ctx[14];
+        /** @var ParagonIE_Sodium_Core32_Int32 $x15 */
+        $x15 = $ctx[15];
+
+        for ($i = 0; $i < 10; ++$i) {
+            # QUARTERROUND( x0,  x4,  x8,  x12)
+            list($x0, $x4, $x8, $x12) = self::quarterRound($x0, $x4, $x8, $x12);
+
+            # QUARTERROUND( x1,  x5,  x9,  x13)
+            list($x1, $x5, $x9, $x13) = self::quarterRound($x1, $x5, $x9, $x13);
+
+            # QUARTERROUND( x2,  x6,  x10,  x14)
+            list($x2, $x6, $x10, $x14) = self::quarterRound($x2, $x6, $x10, $x14);
+
+            # QUARTERROUND( x3,  x7,  x11,  x15)
+            list($x3, $x7, $x11, $x15) = self::quarterRound($x3, $x7, $x11, $x15);
+
+            # QUARTERROUND( x0,  x5,  x10,  x15)
+            list($x0, $x5, $x10, $x15) = self::quarterRound($x0, $x5, $x10, $x15);
+
+            # QUARTERROUND( x1,  x6,  x11,  x12)
+            list($x1, $x6, $x11, $x12) = self::quarterRound($x1, $x6, $x11, $x12);
+
+            # QUARTERROUND( x2,  x7,  x8,  x13)
+            list($x2, $x7, $x8, $x13) = self::quarterRound($x2, $x7, $x8, $x13);
+
+            # QUARTERROUND( x3,  x4,  x9,  x14)
+            list($x3, $x4, $x9, $x14) = self::quarterRound($x3, $x4, $x9, $x14);
+        }
+
+        return $x0->toReverseString() .
+            $x1->toReverseString() .
+            $x2->toReverseString() .
+            $x3->toReverseString() .
+            $x12->toReverseString() .
+            $x13->toReverseString() .
+            $x14->toReverseString() .
+            $x15->toReverseString();
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core32/HSalsa20.php b/vendor/paragonie/sodium_compat/src/Core32/HSalsa20.php
new file mode 100644
index 0000000..39287f2
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core32/HSalsa20.php
@@ -0,0 +1,141 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core32_HSalsa20', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core32_HSalsa20
+ */
+abstract class ParagonIE_Sodium_Core32_HSalsa20 extends ParagonIE_Sodium_Core32_Salsa20
+{
+    /**
+     * Calculate an hsalsa20 hash of a single block
+     *
+     * HSalsa20 doesn't have a counter and will never be used for more than
+     * one block (used to derive a subkey for xsalsa20).
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $in
+     * @param string $k
+     * @param string|null $c
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function hsalsa20($in, $k, $c = null)
+    {
+        /**
+         * @var ParagonIE_Sodium_Core32_Int32 $x0
+         * @var ParagonIE_Sodium_Core32_Int32 $x1
+         * @var ParagonIE_Sodium_Core32_Int32 $x2
+         * @var ParagonIE_Sodium_Core32_Int32 $x3
+         * @var ParagonIE_Sodium_Core32_Int32 $x4
+         * @var ParagonIE_Sodium_Core32_Int32 $x5
+         * @var ParagonIE_Sodium_Core32_Int32 $x6
+         * @var ParagonIE_Sodium_Core32_Int32 $x7
+         * @var ParagonIE_Sodium_Core32_Int32 $x8
+         * @var ParagonIE_Sodium_Core32_Int32 $x9
+         * @var ParagonIE_Sodium_Core32_Int32 $x10
+         * @var ParagonIE_Sodium_Core32_Int32 $x11
+         * @var ParagonIE_Sodium_Core32_Int32 $x12
+         * @var ParagonIE_Sodium_Core32_Int32 $x13
+         * @var ParagonIE_Sodium_Core32_Int32 $x14
+         * @var ParagonIE_Sodium_Core32_Int32 $x15
+         * @var ParagonIE_Sodium_Core32_Int32 $j0
+         * @var ParagonIE_Sodium_Core32_Int32 $j1
+         * @var ParagonIE_Sodium_Core32_Int32 $j2
+         * @var ParagonIE_Sodium_Core32_Int32 $j3
+         * @var ParagonIE_Sodium_Core32_Int32 $j4
+         * @var ParagonIE_Sodium_Core32_Int32 $j5
+         * @var ParagonIE_Sodium_Core32_Int32 $j6
+         * @var ParagonIE_Sodium_Core32_Int32 $j7
+         * @var ParagonIE_Sodium_Core32_Int32 $j8
+         * @var ParagonIE_Sodium_Core32_Int32 $j9
+         * @var ParagonIE_Sodium_Core32_Int32 $j10
+         * @var ParagonIE_Sodium_Core32_Int32 $j11
+         * @var ParagonIE_Sodium_Core32_Int32 $j12
+         * @var ParagonIE_Sodium_Core32_Int32 $j13
+         * @var ParagonIE_Sodium_Core32_Int32 $j14
+         * @var ParagonIE_Sodium_Core32_Int32 $j15
+         */
+        if (self::strlen($k) < 32) {
+            throw new RangeException('Key must be 32 bytes long');
+        }
+        if ($c === null) {
+            $x0  = new ParagonIE_Sodium_Core32_Int32(array(0x6170, 0x7865));
+            $x5  = new ParagonIE_Sodium_Core32_Int32(array(0x3320, 0x646e));
+            $x10 = new ParagonIE_Sodium_Core32_Int32(array(0x7962, 0x2d32));
+            $x15 = new ParagonIE_Sodium_Core32_Int32(array(0x6b20, 0x6574));
+        } else {
+            $x0  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($c, 0, 4));
+            $x5  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($c, 4, 4));
+            $x10 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($c, 8, 4));
+            $x15 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($c, 12, 4));
+        }
+        $x1  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($k, 0, 4));
+        $x2  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($k, 4, 4));
+        $x3  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($k, 8, 4));
+        $x4  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($k, 12, 4));
+        $x6  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($in, 0, 4));
+        $x7  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($in, 4, 4));
+        $x8  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($in, 8, 4));
+        $x9  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($in, 12, 4));
+        $x11 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($k, 16, 4));
+        $x12 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($k, 20, 4));
+        $x13 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($k, 24, 4));
+        $x14 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($k, 28, 4));
+
+        for ($i = self::ROUNDS; $i > 0; $i -= 2) {
+            $x4  = $x4->xorInt32($x0->addInt32($x12)->rotateLeft(7));
+            $x8  = $x8->xorInt32($x4->addInt32($x0)->rotateLeft(9));
+            $x12 = $x12->xorInt32($x8->addInt32($x4)->rotateLeft(13));
+            $x0  = $x0->xorInt32($x12->addInt32($x8)->rotateLeft(18));
+
+            $x9  = $x9->xorInt32($x5->addInt32($x1)->rotateLeft(7));
+            $x13 = $x13->xorInt32($x9->addInt32($x5)->rotateLeft(9));
+            $x1  = $x1->xorInt32($x13->addInt32($x9)->rotateLeft(13));
+            $x5  = $x5->xorInt32($x1->addInt32($x13)->rotateLeft(18));
+
+            $x14 = $x14->xorInt32($x10->addInt32($x6)->rotateLeft(7));
+            $x2  = $x2->xorInt32($x14->addInt32($x10)->rotateLeft(9));
+            $x6  = $x6->xorInt32($x2->addInt32($x14)->rotateLeft(13));
+            $x10 = $x10->xorInt32($x6->addInt32($x2)->rotateLeft(18));
+
+            $x3  = $x3->xorInt32($x15->addInt32($x11)->rotateLeft(7));
+            $x7  = $x7->xorInt32($x3->addInt32($x15)->rotateLeft(9));
+            $x11 = $x11->xorInt32($x7->addInt32($x3)->rotateLeft(13));
+            $x15 = $x15->xorInt32($x11->addInt32($x7)->rotateLeft(18));
+
+            $x1  = $x1->xorInt32($x0->addInt32($x3)->rotateLeft(7));
+            $x2  = $x2->xorInt32($x1->addInt32($x0)->rotateLeft(9));
+            $x3  = $x3->xorInt32($x2->addInt32($x1)->rotateLeft(13));
+            $x0  = $x0->xorInt32($x3->addInt32($x2)->rotateLeft(18));
+
+            $x6  = $x6->xorInt32($x5->addInt32($x4)->rotateLeft(7));
+            $x7  = $x7->xorInt32($x6->addInt32($x5)->rotateLeft(9));
+            $x4  = $x4->xorInt32($x7->addInt32($x6)->rotateLeft(13));
+            $x5  = $x5->xorInt32($x4->addInt32($x7)->rotateLeft(18));
+
+            $x11 = $x11->xorInt32($x10->addInt32($x9)->rotateLeft(7));
+            $x8  = $x8->xorInt32($x11->addInt32($x10)->rotateLeft(9));
+            $x9  = $x9->xorInt32($x8->addInt32($x11)->rotateLeft(13));
+            $x10 = $x10->xorInt32($x9->addInt32($x8)->rotateLeft(18));
+
+            $x12 = $x12->xorInt32($x15->addInt32($x14)->rotateLeft(7));
+            $x13 = $x13->xorInt32($x12->addInt32($x15)->rotateLeft(9));
+            $x14 = $x14->xorInt32($x13->addInt32($x12)->rotateLeft(13));
+            $x15 = $x15->xorInt32($x14->addInt32($x13)->rotateLeft(18));
+        }
+
+        return $x0->toReverseString() .
+            $x5->toReverseString() .
+            $x10->toReverseString() .
+            $x15->toReverseString() .
+            $x6->toReverseString() .
+            $x7->toReverseString() .
+            $x8->toReverseString() .
+            $x9->toReverseString();
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core32/Int32.php b/vendor/paragonie/sodium_compat/src/Core32/Int32.php
new file mode 100644
index 0000000..c3a1790
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core32/Int32.php
@@ -0,0 +1,871 @@
+<?php
+
+/**
+ * Class ParagonIE_Sodium_Core32_Int32
+ *
+ * Encapsulates a 32-bit integer.
+ *
+ * These are immutable. It always returns a new instance.
+ */
+class ParagonIE_Sodium_Core32_Int32
+{
+    /**
+     * @var array<int, int> - two 16-bit integers
+     *
+     * 0 is the higher 16 bits
+     * 1 is the lower 16 bits
+     */
+    public $limbs = array(0, 0);
+
+    /**
+     * @var int
+     */
+    public $overflow = 0;
+
+    /**
+     * @var bool
+     */
+    public $unsignedInt = false;
+
+    /**
+     * ParagonIE_Sodium_Core32_Int32 constructor.
+     * @param array $array
+     * @param bool $unsignedInt
+     */
+    public function __construct($array = array(0, 0), $unsignedInt = false)
+    {
+        $this->limbs = array(
+            (int) $array[0],
+            (int) $array[1]
+        );
+        $this->overflow = 0;
+        $this->unsignedInt = $unsignedInt;
+    }
+
+    /**
+     * Adds two int32 objects
+     *
+     * @param ParagonIE_Sodium_Core32_Int32 $addend
+     * @return ParagonIE_Sodium_Core32_Int32
+     */
+    public function addInt32(ParagonIE_Sodium_Core32_Int32 $addend)
+    {
+        $i0 = $this->limbs[0];
+        $i1 = $this->limbs[1];
+        $j0 = $addend->limbs[0];
+        $j1 = $addend->limbs[1];
+
+        $r1 = $i1 + ($j1 & 0xffff);
+        $carry = $r1 >> 16;
+
+        $r0 = $i0 + ($j0 & 0xffff) + $carry;
+        $carry = $r0 >> 16;
+
+        $r0 &= 0xffff;
+        $r1 &= 0xffff;
+
+        $return = new ParagonIE_Sodium_Core32_Int32(
+            array($r0, $r1)
+        );
+        $return->overflow = $carry;
+        $return->unsignedInt = $this->unsignedInt;
+        return $return;
+    }
+
+    /**
+     * Adds a normal integer to an int32 object
+     *
+     * @param int $int
+     * @return ParagonIE_Sodium_Core32_Int32
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public function addInt($int)
+    {
+        ParagonIE_Sodium_Core32_Util::declareScalarType($int, 'int', 1);
+        /** @var int $int */
+        $int = (int) $int;
+
+        $int = (int) $int;
+
+        $i0 = $this->limbs[0];
+        $i1 = $this->limbs[1];
+
+        $r1 = $i1 + ($int & 0xffff);
+        $carry = $r1 >> 16;
+
+        $r0 = $i0 + (($int >> 16) & 0xffff) + $carry;
+        $carry = $r0 >> 16;
+        $r0 &= 0xffff;
+        $r1 &= 0xffff;
+        $return = new ParagonIE_Sodium_Core32_Int32(
+            array($r0, $r1)
+        );
+        $return->overflow = $carry;
+        $return->unsignedInt = $this->unsignedInt;
+        return $return;
+    }
+
+    /**
+     * @param int $b
+     * @return int
+     */
+    public function compareInt($b = 0)
+    {
+        $gt = 0;
+        $eq = 1;
+
+        $i = 2;
+        $j = 0;
+        while ($i > 0) {
+            --$i;
+            /** @var int $x1 */
+            $x1 = $this->limbs[$i];
+            /** @var int $x2 */
+            $x2 = ($b >> ($j << 4)) & 0xffff;
+            /** @var int $gt */
+            $gt |= (($x2 - $x1) >> 8) & $eq;
+            /** @var int $eq */
+            $eq &= (($x2 ^ $x1) - 1) >> 8;
+        }
+        return ($gt + $gt - $eq) + 1;
+    }
+
+    /**
+     * @param int $m
+     * @return ParagonIE_Sodium_Core32_Int32
+     */
+    public function mask($m = 0)
+    {
+        /** @var int $hi */
+        $hi = ($m >> 16) & 0xffff;
+        /** @var int $lo */
+        $lo = ($m & 0xffff);
+        return new ParagonIE_Sodium_Core32_Int32(
+            array(
+                (int) ($this->limbs[0] & $hi),
+                (int) ($this->limbs[1] & $lo)
+            ),
+            $this->unsignedInt
+        );
+    }
+
+    /**
+     * @param array<int, int> $a
+     * @param array<int, int> $b
+     * @param int $baseLog2
+     * @return array<int, int>
+     */
+    public function multiplyLong(array $a, array $b, $baseLog2 = 16)
+    {
+        $a_l = count($a);
+        $b_l = count($b);
+        /** @var array<int, int> $r */
+        $r = array_fill(0, $a_l + $b_l + 1, 0);
+        $base = 1 << $baseLog2;
+        for ($i = 0; $i < $a_l; ++$i) {
+            $a_i = $a[$i];
+            for ($j = 0; $j < $a_l; ++$j) {
+                $b_j = $b[$j];
+                $product = ($a_i * $b_j) + $r[$i + $j];
+                $carry = ($product >> $baseLog2 & 0xffff);
+                $r[$i + $j] = ($product - (int) ($carry * $base)) & 0xffff;
+                $r[$i + $j + 1] += $carry;
+            }
+        }
+        return array_slice($r, 0, 5);
+    }
+
+    /**
+     * @param int $int
+     * @return ParagonIE_Sodium_Core32_Int32
+     */
+    public function mulIntFast($int)
+    {
+        // Handle negative numbers
+        $aNeg = ($this->limbs[0] >> 15) & 1;
+        $bNeg = ($int >> 31) & 1;
+        $a = array_reverse($this->limbs);
+        $b = array(
+            $int & 0xffff,
+            ($int >> 16) & 0xffff
+        );
+        if ($aNeg) {
+            for ($i = 0; $i < 2; ++$i) {
+                $a[$i] = ($a[$i] ^ 0xffff) & 0xffff;
+            }
+            ++$a[0];
+        }
+        if ($bNeg) {
+            for ($i = 0; $i < 2; ++$i) {
+                $b[$i] = ($b[$i] ^ 0xffff) & 0xffff;
+            }
+            ++$b[0];
+        }
+        // Multiply
+        $res = $this->multiplyLong($a, $b);
+
+        // Re-apply negation to results
+        if ($aNeg !== $bNeg) {
+            for ($i = 0; $i < 2; ++$i) {
+                $res[$i] = (0xffff ^ $res[$i]) & 0xffff;
+            }
+            // Handle integer overflow
+            $c = 1;
+            for ($i = 0; $i < 2; ++$i) {
+                $res[$i] += $c;
+                $c = $res[$i] >> 16;
+                $res[$i] &= 0xffff;
+            }
+        }
+
+        // Return our values
+        $return = new ParagonIE_Sodium_Core32_Int32();
+        $return->limbs = array(
+            $res[1] & 0xffff,
+            $res[0] & 0xffff
+        );
+        if (count($res) > 2) {
+            $return->overflow = $res[2] & 0xffff;
+        }
+        $return->unsignedInt = $this->unsignedInt;
+        return $return;
+    }
+
+    /**
+     * @param ParagonIE_Sodium_Core32_Int32 $right
+     * @return ParagonIE_Sodium_Core32_Int32
+     */
+    public function mulInt32Fast(ParagonIE_Sodium_Core32_Int32 $right)
+    {
+        $aNeg = ($this->limbs[0] >> 15) & 1;
+        $bNeg = ($right->limbs[0] >> 15) & 1;
+
+        $a = array_reverse($this->limbs);
+        $b = array_reverse($right->limbs);
+        if ($aNeg) {
+            for ($i = 0; $i < 2; ++$i) {
+                $a[$i] = ($a[$i] ^ 0xffff) & 0xffff;
+            }
+            ++$a[0];
+        }
+        if ($bNeg) {
+            for ($i = 0; $i < 2; ++$i) {
+                $b[$i] = ($b[$i] ^ 0xffff) & 0xffff;
+            }
+            ++$b[0];
+        }
+        $res = $this->multiplyLong($a, $b);
+        if ($aNeg !== $bNeg) {
+            if ($aNeg !== $bNeg) {
+                for ($i = 0; $i < 2; ++$i) {
+                    $res[$i] = ($res[$i] ^ 0xffff) & 0xffff;
+                }
+                $c = 1;
+                for ($i = 0; $i < 2; ++$i) {
+                    $res[$i] += $c;
+                    $c = $res[$i] >> 16;
+                    $res[$i] &= 0xffff;
+                }
+            }
+        }
+        $return = new ParagonIE_Sodium_Core32_Int32();
+        $return->limbs = array(
+            $res[1] & 0xffff,
+            $res[0] & 0xffff
+        );
+        if (count($res) > 2) {
+            $return->overflow = $res[2];
+        }
+        return $return;
+    }
+
+    /**
+     * @param int $int
+     * @param int $size
+     * @return ParagonIE_Sodium_Core32_Int32
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public function mulInt($int = 0, $size = 0)
+    {
+        ParagonIE_Sodium_Core32_Util::declareScalarType($int, 'int', 1);
+        ParagonIE_Sodium_Core32_Util::declareScalarType($size, 'int', 2);
+        if (ParagonIE_Sodium_Compat::$fastMult) {
+            return $this->mulIntFast((int) $int);
+        }
+        /** @var int $int */
+        $int = (int) $int;
+        /** @var int $size */
+        $size = (int) $size;
+
+        if (!$size) {
+            $size = 31;
+        }
+        /** @var int $size */
+
+        $a = clone $this;
+        $return = new ParagonIE_Sodium_Core32_Int32();
+        $return->unsignedInt = $this->unsignedInt;
+
+        // Initialize:
+        $ret0 = 0;
+        $ret1 = 0;
+        $a0 = $a->limbs[0];
+        $a1 = $a->limbs[1];
+
+        /** @var int $size */
+        /** @var int $i */
+        for ($i = $size; $i >= 0; --$i) {
+            $m = (int) (-($int & 1));
+            $x0 = $a0 & $m;
+            $x1 = $a1 & $m;
+
+            $ret1 += $x1;
+            $c = $ret1 >> 16;
+
+            $ret0 += $x0 + $c;
+
+            $ret0 &= 0xffff;
+            $ret1 &= 0xffff;
+
+            $a1 = ($a1 << 1);
+            $x1 = $a1 >> 16;
+            $a0 = ($a0 << 1) | $x1;
+            $a0 &= 0xffff;
+            $a1 &= 0xffff;
+            $int >>= 1;
+        }
+        $return->limbs[0] = $ret0;
+        $return->limbs[1] = $ret1;
+        return $return;
+    }
+
+    /**
+     * @param ParagonIE_Sodium_Core32_Int32 $int
+     * @param int $size
+     * @return ParagonIE_Sodium_Core32_Int32
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public function mulInt32(ParagonIE_Sodium_Core32_Int32 $int, $size = 0)
+    {
+        ParagonIE_Sodium_Core32_Util::declareScalarType($size, 'int', 2);
+        if (ParagonIE_Sodium_Compat::$fastMult) {
+            return $this->mulInt32Fast($int);
+        }
+        if (!$size) {
+            $size = 31;
+        }
+        /** @var int $size */
+
+        $a = clone $this;
+        $b = clone $int;
+        $return = new ParagonIE_Sodium_Core32_Int32();
+        $return->unsignedInt = $this->unsignedInt;
+
+        // Initialize:
+        $ret0 = 0;
+        $ret1 = 0;
+        $a0 = $a->limbs[0];
+        $a1 = $a->limbs[1];
+        $b0 = $b->limbs[0];
+        $b1 = $b->limbs[1];
+
+        /** @var int $size */
+        /** @var int $i */
+        for ($i = $size; $i >= 0; --$i) {
+            $m = (int) (-($b1 & 1));
+            $x0 = $a0 & $m;
+            $x1 = $a1 & $m;
+
+            $ret1 += $x1;
+            $c = $ret1 >> 16;
+
+            $ret0 += $x0 + $c;
+
+            $ret0 &= 0xffff;
+            $ret1 &= 0xffff;
+
+            $a1 = ($a1 << 1);
+            $x1 = $a1 >> 16;
+            $a0 = ($a0 << 1) | $x1;
+            $a0 &= 0xffff;
+            $a1 &= 0xffff;
+
+            $x0 = ($b0 & 1) << 16;
+            $b0 = ($b0 >> 1);
+            $b1 = (($b1 | $x0) >> 1);
+
+            $b0 &= 0xffff;
+            $b1 &= 0xffff;
+
+        }
+        $return->limbs[0] = $ret0;
+        $return->limbs[1] = $ret1;
+
+        return $return;
+    }
+
+    /**
+     * OR this 32-bit integer with another.
+     *
+     * @param ParagonIE_Sodium_Core32_Int32 $b
+     * @return ParagonIE_Sodium_Core32_Int32
+     */
+    public function orInt32(ParagonIE_Sodium_Core32_Int32 $b)
+    {
+        $return = new ParagonIE_Sodium_Core32_Int32();
+        $return->unsignedInt = $this->unsignedInt;
+        $return->limbs = array(
+            (int) ($this->limbs[0] | $b->limbs[0]),
+            (int) ($this->limbs[1] | $b->limbs[1])
+        );
+        /** @var int overflow */
+        $return->overflow = $this->overflow | $b->overflow;
+        return $return;
+    }
+
+    /**
+     * @param int $b
+     * @return bool
+     */
+    public function isGreaterThan($b = 0)
+    {
+        return $this->compareInt($b) > 0;
+    }
+
+    /**
+     * @param int $b
+     * @return bool
+     */
+    public function isLessThanInt($b = 0)
+    {
+        return $this->compareInt($b) < 0;
+    }
+
+    /**
+     * @param int $c
+     * @return ParagonIE_Sodium_Core32_Int32
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArrayAccess
+     */
+    public function rotateLeft($c = 0)
+    {
+        ParagonIE_Sodium_Core32_Util::declareScalarType($c, 'int', 1);
+        /** @var int $c */
+        $c = (int) $c;
+
+        $return = new ParagonIE_Sodium_Core32_Int32();
+        $return->unsignedInt = $this->unsignedInt;
+        $c &= 31;
+        if ($c === 0) {
+            // NOP, but we want a copy.
+            $return->limbs = $this->limbs;
+        } else {
+            /** @var int $c */
+
+            /** @var int $idx_shift */
+            $idx_shift = ($c >> 4) & 1;
+
+            /** @var int $sub_shift */
+            $sub_shift = $c & 15;
+
+            /** @var array<int, int> $limbs */
+            $limbs =& $return->limbs;
+
+            /** @var array<int, int> $myLimbs */
+            $myLimbs =& $this->limbs;
+
+            for ($i = 1; $i >= 0; --$i) {
+                /** @var int $j */
+                $j = ($i + $idx_shift) & 1;
+                /** @var int $k */
+                $k = ($i + $idx_shift + 1) & 1;
+                $limbs[$i] = (int) (
+                    (
+                        ((int) ($myLimbs[$j]) << $sub_shift)
+                            |
+                        ((int) ($myLimbs[$k]) >> (16 - $sub_shift))
+                    ) & 0xffff
+                );
+            }
+        }
+        return $return;
+    }
+
+    /**
+     * Rotate to the right
+     *
+     * @param int $c
+     * @return ParagonIE_Sodium_Core32_Int32
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArrayAccess
+     */
+    public function rotateRight($c = 0)
+    {
+        ParagonIE_Sodium_Core32_Util::declareScalarType($c, 'int', 1);
+        /** @var int $c */
+        $c = (int) $c;
+
+        $return = new ParagonIE_Sodium_Core32_Int32();
+        $return->unsignedInt = $this->unsignedInt;
+        $c &= 31;
+        /** @var int $c */
+        if ($c === 0) {
+            // NOP, but we want a copy.
+            $return->limbs = $this->limbs;
+        } else {
+            /** @var int $c */
+
+            /** @var int $idx_shift */
+            $idx_shift = ($c >> 4) & 1;
+
+            /** @var int $sub_shift */
+            $sub_shift = $c & 15;
+
+            /** @var array<int, int> $limbs */
+            $limbs =& $return->limbs;
+
+            /** @var array<int, int> $myLimbs */
+            $myLimbs =& $this->limbs;
+
+            for ($i = 1; $i >= 0; --$i) {
+                /** @var int $j */
+                $j = ($i - $idx_shift) & 1;
+                /** @var int $k */
+                $k = ($i - $idx_shift - 1) & 1;
+                $limbs[$i] = (int) (
+                    (
+                        ((int) ($myLimbs[$j]) >> (int) ($sub_shift))
+                            |
+                        ((int) ($myLimbs[$k]) << (16 - (int) ($sub_shift)))
+                    ) & 0xffff
+                );
+            }
+        }
+        return $return;
+    }
+
+    /**
+     * @param bool $bool
+     * @return self
+     */
+    public function setUnsignedInt($bool = false)
+    {
+        $this->unsignedInt = !empty($bool);
+        return $this;
+    }
+
+    /**
+     * @param int $c
+     * @return ParagonIE_Sodium_Core32_Int32
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public function shiftLeft($c = 0)
+    {
+        ParagonIE_Sodium_Core32_Util::declareScalarType($c, 'int', 1);
+        /** @var int $c */
+        $c = (int) $c;
+
+        $return = new ParagonIE_Sodium_Core32_Int32();
+        $return->unsignedInt = $this->unsignedInt;
+        $c &= 63;
+        /** @var int $c */
+        if ($c === 0) {
+            $return->limbs = $this->limbs;
+        } elseif ($c < 0) {
+            /** @var int $c */
+            return $this->shiftRight(-$c);
+        } else {
+            /** @var int $c */
+            /** @var int $tmp */
+            $tmp = $this->limbs[1] << $c;
+            $return->limbs[1] = (int)($tmp & 0xffff);
+            /** @var int $carry */
+            $carry = $tmp >> 16;
+
+            /** @var int $tmp */
+            $tmp = ($this->limbs[0] << $c) | ($carry & 0xffff);
+            $return->limbs[0] = (int) ($tmp & 0xffff);
+        }
+        return $return;
+    }
+
+    /**
+     * @param int $c
+     * @return ParagonIE_Sodium_Core32_Int32
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedAssignment
+     * @psalm-suppress MixedOperand
+     */
+    public function shiftRight($c = 0)
+    {
+        ParagonIE_Sodium_Core32_Util::declareScalarType($c, 'int', 1);
+        /** @var int $c */
+        $c = (int) $c;
+
+        $return = new ParagonIE_Sodium_Core32_Int32();
+        $return->unsignedInt = $this->unsignedInt;
+        $c &= 63;
+        /** @var int $c */
+        if ($c >= 16) {
+            $return->limbs = array(
+                (int) ($this->overflow & 0xffff),
+                (int) ($this->limbs[0])
+            );
+            $return->overflow = $this->overflow >> 16;
+            return $return->shiftRight($c & 15);
+        }
+        if ($c === 0) {
+            $return->limbs = $this->limbs;
+        } elseif ($c < 0) {
+            /** @var int $c */
+            return $this->shiftLeft(-$c);
+        } else {
+            if (!is_int($c)) {
+                throw new TypeError();
+            }
+            /** @var int $c */
+            // $return->limbs[0] = (int) (($this->limbs[0] >> $c) & 0xffff);
+            $carryLeft = (int) ($this->overflow & ((1 << ($c + 1)) - 1));
+            $return->limbs[0] = (int) ((($this->limbs[0] >> $c) | ($carryLeft << (16 - $c))) & 0xffff);
+            $carryRight = (int) ($this->limbs[0] & ((1 << ($c + 1)) - 1));
+            $return->limbs[1] = (int) ((($this->limbs[1] >> $c) | ($carryRight << (16 - $c))) & 0xffff);
+            $return->overflow >>= $c;
+        }
+        return $return;
+    }
+
+    /**
+     * Subtract a normal integer from an int32 object.
+     *
+     * @param int $int
+     * @return ParagonIE_Sodium_Core32_Int32
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public function subInt($int)
+    {
+        ParagonIE_Sodium_Core32_Util::declareScalarType($int, 'int', 1);
+        /** @var int $int */
+        $int = (int) $int;
+
+        $return = new ParagonIE_Sodium_Core32_Int32();
+        $return->unsignedInt = $this->unsignedInt;
+
+        /** @var int $tmp */
+        $tmp = $this->limbs[1] - ($int & 0xffff);
+        /** @var int $carry */
+        $carry = $tmp >> 16;
+        $return->limbs[1] = (int) ($tmp & 0xffff);
+
+        /** @var int $tmp */
+        $tmp = $this->limbs[0] - (($int >> 16) & 0xffff) + $carry;
+        $return->limbs[0] = (int) ($tmp & 0xffff);
+        return $return;
+    }
+
+    /**
+     * Subtract two int32 objects from each other
+     *
+     * @param ParagonIE_Sodium_Core32_Int32 $b
+     * @return ParagonIE_Sodium_Core32_Int32
+     */
+    public function subInt32(ParagonIE_Sodium_Core32_Int32 $b)
+    {
+        $return = new ParagonIE_Sodium_Core32_Int32();
+        $return->unsignedInt = $this->unsignedInt;
+
+        /** @var int $tmp */
+        $tmp = $this->limbs[1] - ($b->limbs[1] & 0xffff);
+        /** @var int $carry */
+        $carry = $tmp >> 16;
+        $return->limbs[1] = (int) ($tmp & 0xffff);
+
+        /** @var int $tmp */
+        $tmp = $this->limbs[0] - ($b->limbs[0] & 0xffff) + $carry;
+        $return->limbs[0] = (int) ($tmp & 0xffff);
+        return $return;
+    }
+
+    /**
+     * XOR this 32-bit integer with another.
+     *
+     * @param ParagonIE_Sodium_Core32_Int32 $b
+     * @return ParagonIE_Sodium_Core32_Int32
+     */
+    public function xorInt32(ParagonIE_Sodium_Core32_Int32 $b)
+    {
+        $return = new ParagonIE_Sodium_Core32_Int32();
+        $return->unsignedInt = $this->unsignedInt;
+        $return->limbs = array(
+            (int) ($this->limbs[0] ^ $b->limbs[0]),
+            (int) ($this->limbs[1] ^ $b->limbs[1])
+        );
+        return $return;
+    }
+
+    /**
+     * @param int $signed
+     * @return self
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function fromInt($signed)
+    {
+        ParagonIE_Sodium_Core32_Util::declareScalarType($signed, 'int', 1);;
+        /** @var int $signed */
+        $signed = (int) $signed;
+
+        return new ParagonIE_Sodium_Core32_Int32(
+            array(
+                (int) (($signed >> 16) & 0xffff),
+                (int) ($signed & 0xffff)
+            )
+        );
+    }
+
+    /**
+     * @param string $string
+     * @return self
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function fromString($string)
+    {
+        ParagonIE_Sodium_Core32_Util::declareScalarType($string, 'string', 1);
+        $string = (string) $string;
+        if (ParagonIE_Sodium_Core32_Util::strlen($string) !== 4) {
+            throw new RangeException(
+                'String must be 4 bytes; ' . ParagonIE_Sodium_Core32_Util::strlen($string) . ' given.'
+            );
+        }
+        $return = new ParagonIE_Sodium_Core32_Int32();
+
+        $return->limbs[0]  = (int) ((ParagonIE_Sodium_Core32_Util::chrToInt($string[0]) & 0xff) << 8);
+        $return->limbs[0] |= (ParagonIE_Sodium_Core32_Util::chrToInt($string[1]) & 0xff);
+        $return->limbs[1]  = (int) ((ParagonIE_Sodium_Core32_Util::chrToInt($string[2]) & 0xff) << 8);
+        $return->limbs[1] |= (ParagonIE_Sodium_Core32_Util::chrToInt($string[3]) & 0xff);
+        return $return;
+    }
+
+    /**
+     * @param string $string
+     * @return self
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function fromReverseString($string)
+    {
+        ParagonIE_Sodium_Core32_Util::declareScalarType($string, 'string', 1);
+        $string = (string) $string;
+        if (ParagonIE_Sodium_Core32_Util::strlen($string) !== 4) {
+            throw new RangeException(
+                'String must be 4 bytes; ' . ParagonIE_Sodium_Core32_Util::strlen($string) . ' given.'
+            );
+        }
+        $return = new ParagonIE_Sodium_Core32_Int32();
+
+        $return->limbs[0]  = (int) ((ParagonIE_Sodium_Core32_Util::chrToInt($string[3]) & 0xff) << 8);
+        $return->limbs[0] |= (ParagonIE_Sodium_Core32_Util::chrToInt($string[2]) & 0xff);
+        $return->limbs[1]  = (int) ((ParagonIE_Sodium_Core32_Util::chrToInt($string[1]) & 0xff) << 8);
+        $return->limbs[1] |= (ParagonIE_Sodium_Core32_Util::chrToInt($string[0]) & 0xff);
+        return $return;
+    }
+
+    /**
+     * @return array<int, int>
+     */
+    public function toArray()
+    {
+        return array((int) ($this->limbs[0] << 16 | $this->limbs[1]));
+    }
+
+    /**
+     * @return string
+     * @throws TypeError
+     */
+    public function toString()
+    {
+        return
+            ParagonIE_Sodium_Core32_Util::intToChr(($this->limbs[0] >> 8) & 0xff) .
+            ParagonIE_Sodium_Core32_Util::intToChr($this->limbs[0] & 0xff) .
+            ParagonIE_Sodium_Core32_Util::intToChr(($this->limbs[1] >> 8) & 0xff) .
+            ParagonIE_Sodium_Core32_Util::intToChr($this->limbs[1] & 0xff);
+    }
+
+    /**
+     * @return int
+     */
+    public function toInt()
+    {
+        return (int) (
+            (($this->limbs[0] & 0xffff) << 16)
+                |
+            ($this->limbs[1] & 0xffff)
+        );
+    }
+
+    /**
+     * @return ParagonIE_Sodium_Core32_Int32
+     */
+    public function toInt32()
+    {
+        $return = new ParagonIE_Sodium_Core32_Int32();
+        $return->limbs[0] = (int) ($this->limbs[0] & 0xffff);
+        $return->limbs[1] = (int) ($this->limbs[1] & 0xffff);
+        $return->unsignedInt = $this->unsignedInt;
+        $return->overflow = (int) ($this->overflow & 0x7fffffff);
+        return $return;
+    }
+
+    /**
+     * @return ParagonIE_Sodium_Core32_Int64
+     */
+    public function toInt64()
+    {
+        $return = new ParagonIE_Sodium_Core32_Int64();
+        $return->unsignedInt = $this->unsignedInt;
+        if ($this->unsignedInt) {
+            $return->limbs[0] += (($this->overflow >> 16) & 0xffff);
+            $return->limbs[1] += (($this->overflow) & 0xffff);
+        } else {
+            $neg = -(($this->limbs[0] >> 15) & 1);
+            $return->limbs[0] = (int)($neg & 0xffff);
+            $return->limbs[1] = (int)($neg & 0xffff);
+        }
+        $return->limbs[2] = (int) ($this->limbs[0] & 0xffff);
+        $return->limbs[3] = (int) ($this->limbs[1] & 0xffff);
+        return $return;
+    }
+
+    /**
+     * @return string
+     * @throws TypeError
+     */
+    public function toReverseString()
+    {
+        return ParagonIE_Sodium_Core32_Util::intToChr($this->limbs[1] & 0xff) .
+            ParagonIE_Sodium_Core32_Util::intToChr(($this->limbs[1] >> 8) & 0xff) .
+            ParagonIE_Sodium_Core32_Util::intToChr($this->limbs[0] & 0xff) .
+            ParagonIE_Sodium_Core32_Util::intToChr(($this->limbs[0] >> 8) & 0xff);
+    }
+
+    /**
+     * @return string
+     */
+    public function __toString()
+    {
+        try {
+            return $this->toString();
+        } catch (TypeError $ex) {
+            // PHP engine can't handle exceptions from __toString()
+            return '';
+        }
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core32/Int64.php b/vendor/paragonie/sodium_compat/src/Core32/Int64.php
new file mode 100644
index 0000000..dd06a3f
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core32/Int64.php
@@ -0,0 +1,1066 @@
+<?php
+
+/**
+ * Class ParagonIE_Sodium_Core32_Int64
+ *
+ * Encapsulates a 64-bit integer.
+ *
+ * These are immutable. It always returns a new instance.
+ */
+class ParagonIE_Sodium_Core32_Int64
+{
+    /**
+     * @var array<int, int> - four 16-bit integers
+     */
+    public $limbs = array(0, 0, 0, 0);
+
+    /**
+     * @var int
+     */
+    public $overflow = 0;
+
+    /**
+     * @var bool
+     */
+    public $unsignedInt = false;
+
+    /**
+     * ParagonIE_Sodium_Core32_Int64 constructor.
+     * @param array $array
+     * @param bool $unsignedInt
+     */
+    public function __construct($array = array(0, 0, 0, 0), $unsignedInt = false)
+    {
+        $this->limbs = array(
+            (int) $array[0],
+            (int) $array[1],
+            (int) $array[2],
+            (int) $array[3]
+        );
+        $this->overflow = 0;
+        $this->unsignedInt = $unsignedInt;
+    }
+
+    /**
+     * Adds two int64 objects
+     *
+     * @param ParagonIE_Sodium_Core32_Int64 $addend
+     * @return ParagonIE_Sodium_Core32_Int64
+     */
+    public function addInt64(ParagonIE_Sodium_Core32_Int64 $addend)
+    {
+        $i0 = $this->limbs[0];
+        $i1 = $this->limbs[1];
+        $i2 = $this->limbs[2];
+        $i3 = $this->limbs[3];
+        $j0 = $addend->limbs[0];
+        $j1 = $addend->limbs[1];
+        $j2 = $addend->limbs[2];
+        $j3 = $addend->limbs[3];
+
+        $r3 = $i3 + ($j3 & 0xffff);
+        $carry = $r3 >> 16;
+
+        $r2 = $i2 + ($j2 & 0xffff) + $carry;
+        $carry = $r2 >> 16;
+
+        $r1 = $i1 + ($j1 & 0xffff) + $carry;
+        $carry = $r1 >> 16;
+
+        $r0 = $i0 + ($j0 & 0xffff) + $carry;
+        $carry = $r0 >> 16;
+
+        $r0 &= 0xffff;
+        $r1 &= 0xffff;
+        $r2 &= 0xffff;
+        $r3 &= 0xffff;
+
+        $return = new ParagonIE_Sodium_Core32_Int64(
+            array($r0, $r1, $r2, $r3)
+        );
+        $return->overflow = $carry;
+        $return->unsignedInt = $this->unsignedInt;
+        return $return;
+    }
+
+    /**
+     * Adds a normal integer to an int64 object
+     *
+     * @param int $int
+     * @return ParagonIE_Sodium_Core32_Int64
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public function addInt($int)
+    {
+        ParagonIE_Sodium_Core32_Util::declareScalarType($int, 'int', 1);
+        /** @var int $int */
+        $int = (int) $int;
+
+        $i0 = $this->limbs[0];
+        $i1 = $this->limbs[1];
+        $i2 = $this->limbs[2];
+        $i3 = $this->limbs[3];
+
+        $r3 = $i3 + ($int & 0xffff);
+        $carry = $r3 >> 16;
+
+        $r2 = $i2 + (($int >> 16) & 0xffff) + $carry;
+        $carry = $r2 >> 16;
+
+        $r1 = $i1 + $carry;
+        $carry = $r1 >> 16;
+
+        $r0 = $i0 + $carry;
+        $carry = $r0 >> 16;
+
+        $r0 &= 0xffff;
+        $r1 &= 0xffff;
+        $r2 &= 0xffff;
+        $r3 &= 0xffff;
+        $return = new ParagonIE_Sodium_Core32_Int64(
+            array($r0, $r1, $r2, $r3)
+        );
+        $return->overflow = $carry;
+        $return->unsignedInt = $this->unsignedInt;
+        return $return;
+    }
+
+    /**
+     * @param int $b
+     * @return int
+     */
+    public function compareInt($b = 0)
+    {
+        $gt = 0;
+        $eq = 1;
+
+        $i = 4;
+        $j = 0;
+        while ($i > 0) {
+            --$i;
+            /** @var int $x1 */
+            $x1 = $this->limbs[$i];
+            /** @var int $x2 */
+            $x2 = ($b >> ($j << 4)) & 0xffff;
+            /** int */
+            $gt |= (($x2 - $x1) >> 8) & $eq;
+            /** int */
+            $eq &= (($x2 ^ $x1) - 1) >> 8;
+        }
+        return ($gt + $gt - $eq) + 1;
+    }
+
+    /**
+     * @param int $b
+     * @return bool
+     */
+    public function isGreaterThan($b = 0)
+    {
+        return $this->compareInt($b) > 0;
+    }
+
+    /**
+     * @param int $b
+     * @return bool
+     */
+    public function isLessThanInt($b = 0)
+    {
+        return $this->compareInt($b) < 0;
+    }
+
+    /**
+     * @param int $hi
+     * @param int $lo
+     * @return ParagonIE_Sodium_Core32_Int64
+     */
+    public function mask64($hi = 0, $lo = 0)
+    {
+        /** @var int $a */
+        $a = ($hi >> 16) & 0xffff;
+        /** @var int $b */
+        $b = ($hi) & 0xffff;
+        /** @var int $c */
+        $c = ($lo >> 16) & 0xffff;
+        /** @var int $d */
+        $d = ($lo & 0xffff);
+        return new ParagonIE_Sodium_Core32_Int64(
+            array(
+                $this->limbs[0] & $a,
+                $this->limbs[1] & $b,
+                $this->limbs[2] & $c,
+                $this->limbs[3] & $d
+            ),
+            $this->unsignedInt
+        );
+    }
+
+    /**
+     * @param int $int
+     * @param int $size
+     * @return ParagonIE_Sodium_Core32_Int64
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedAssignment
+     */
+    public function mulInt($int = 0, $size = 0)
+    {
+        if (ParagonIE_Sodium_Compat::$fastMult) {
+            return $this->mulIntFast($int);
+        }
+        ParagonIE_Sodium_Core32_Util::declareScalarType($int, 'int', 1);
+        ParagonIE_Sodium_Core32_Util::declareScalarType($size, 'int', 2);
+        /** @var int $int */
+        $int = (int) $int;
+        /** @var int $size */
+        $size = (int) $size;
+
+        if (!$size) {
+            $size = 63;
+        }
+
+        $a = clone $this;
+        $return = new ParagonIE_Sodium_Core32_Int64();
+        $return->unsignedInt = $this->unsignedInt;
+
+        // Initialize:
+        $ret0 = 0;
+        $ret1 = 0;
+        $ret2 = 0;
+        $ret3 = 0;
+        $a0 = $a->limbs[0];
+        $a1 = $a->limbs[1];
+        $a2 = $a->limbs[2];
+        $a3 = $a->limbs[3];
+
+        /** @var int $size */
+        /** @var int $i */
+        for ($i = $size; $i >= 0; --$i) {
+            $mask = -($int & 1);
+            $x0 = $a0 & $mask;
+            $x1 = $a1 & $mask;
+            $x2 = $a2 & $mask;
+            $x3 = $a3 & $mask;
+
+            $ret3 += $x3;
+            $c = $ret3 >> 16;
+
+            $ret2 += $x2 + $c;
+            $c = $ret2 >> 16;
+
+            $ret1 += $x1 + $c;
+            $c = $ret1 >> 16;
+
+            $ret0 += $x0 + $c;
+
+            $ret0 &= 0xffff;
+            $ret1 &= 0xffff;
+            $ret2 &= 0xffff;
+            $ret3 &= 0xffff;
+
+            $a3 = $a3 << 1;
+            $x3 = $a3 >> 16;
+            $a2 = ($a2 << 1) | $x3;
+            $x2 = $a2 >> 16;
+            $a1 = ($a1 << 1) | $x2;
+            $x1 = $a1 >> 16;
+            $a0 = ($a0 << 1) | $x1;
+            $a0 &= 0xffff;
+            $a1 &= 0xffff;
+            $a2 &= 0xffff;
+            $a3 &= 0xffff;
+
+            $int >>= 1;
+        }
+        $return->limbs[0] = $ret0;
+        $return->limbs[1] = $ret1;
+        $return->limbs[2] = $ret2;
+        $return->limbs[3] = $ret3;
+        return $return;
+    }
+
+    /**
+     * @param ParagonIE_Sodium_Core32_Int64 $A
+     * @param ParagonIE_Sodium_Core32_Int64 $B
+     * @return array<int, ParagonIE_Sodium_Core32_Int64>
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedInferredReturnType
+     */
+    public static function ctSelect(
+        ParagonIE_Sodium_Core32_Int64 $A,
+        ParagonIE_Sodium_Core32_Int64 $B
+    ) {
+        $a = clone $A;
+        $b = clone $B;
+        /** @var int $aNeg */
+        $aNeg = ($a->limbs[0] >> 15) & 1;
+        /** @var int $bNeg */
+        $bNeg = ($b->limbs[0] >> 15) & 1;
+        /** @var int $m */
+        $m = (-($aNeg & $bNeg)) | 1;
+        /** @var int $swap */
+        $swap = $bNeg & ~$aNeg;
+        /** @var int $d */
+        $d = -$swap;
+
+        /*
+        if ($bNeg && !$aNeg) {
+            $a = clone $int;
+            $b = clone $this;
+        } elseif($bNeg && $aNeg) {
+            $a = $this->mulInt(-1);
+            $b = $int->mulInt(-1);
+        }
+         */
+        $x = $a->xorInt64($b)->mask64($d, $d);
+        return array(
+            $a->xorInt64($x)->mulInt($m),
+            $b->xorInt64($x)->mulInt($m)
+        );
+    }
+
+    /**
+     * @param array<int, int> $a
+     * @param array<int, int> $b
+     * @param int $baseLog2
+     * @return array<int, int>
+     */
+    public function multiplyLong(array $a, array $b, $baseLog2 = 16)
+    {
+        $a_l = count($a);
+        $b_l = count($b);
+        /** @var array<int, int> $r */
+        $r = array_fill(0, $a_l + $b_l + 1, 0);
+        $base = 1 << $baseLog2;
+        for ($i = 0; $i < $a_l; ++$i) {
+            $a_i = $a[$i];
+            for ($j = 0; $j < $a_l; ++$j) {
+                $b_j = $b[$j];
+                $product = ($a_i * $b_j) + $r[$i + $j];
+                $carry = ($product >> $baseLog2 & 0xffff);
+                $r[$i + $j] = ($product - (int) ($carry * $base)) & 0xffff;
+                $r[$i + $j + 1] += $carry;
+            }
+        }
+        return array_slice($r, 0, 5);
+    }
+
+    /**
+     * @param int $int
+     * @return ParagonIE_Sodium_Core32_Int64
+     */
+    public function mulIntFast($int)
+    {
+        // Handle negative numbers
+        $aNeg = ($this->limbs[0] >> 15) & 1;
+        $bNeg = ($int >> 31) & 1;
+        $a = array_reverse($this->limbs);
+        $b = array(
+            $int & 0xffff,
+            ($int >> 16) & 0xffff,
+            -$bNeg & 0xffff,
+            -$bNeg & 0xffff
+        );
+        if ($aNeg) {
+            for ($i = 0; $i < 4; ++$i) {
+                $a[$i] = ($a[$i] ^ 0xffff) & 0xffff;
+            }
+            ++$a[0];
+        }
+        if ($bNeg) {
+            for ($i = 0; $i < 4; ++$i) {
+                $b[$i] = ($b[$i] ^ 0xffff) & 0xffff;
+            }
+            ++$b[0];
+        }
+        // Multiply
+        $res = $this->multiplyLong($a, $b);
+
+        // Re-apply negation to results
+        if ($aNeg !== $bNeg) {
+            for ($i = 0; $i < 4; ++$i) {
+                $res[$i] = (0xffff ^ $res[$i]) & 0xffff;
+            }
+            // Handle integer overflow
+            $c = 1;
+            for ($i = 0; $i < 4; ++$i) {
+                $res[$i] += $c;
+                $c = $res[$i] >> 16;
+                $res[$i] &= 0xffff;
+            }
+        }
+
+        // Return our values
+        $return = new ParagonIE_Sodium_Core32_Int64();
+        $return->limbs = array(
+            $res[3] & 0xffff,
+            $res[2] & 0xffff,
+            $res[1] & 0xffff,
+            $res[0] & 0xffff
+        );
+        if (count($res) > 4) {
+            $return->overflow = $res[4] & 0xffff;
+        }
+        $return->unsignedInt = $this->unsignedInt;
+        return $return;
+    }
+
+    /**
+     * @param ParagonIE_Sodium_Core32_Int64 $right
+     * @return ParagonIE_Sodium_Core32_Int64
+     */
+    public function mulInt64Fast(ParagonIE_Sodium_Core32_Int64 $right)
+    {
+        $aNeg = ($this->limbs[0] >> 15) & 1;
+        $bNeg = ($right->limbs[0] >> 15) & 1;
+
+        $a = array_reverse($this->limbs);
+        $b = array_reverse($right->limbs);
+        if ($aNeg) {
+            for ($i = 0; $i < 4; ++$i) {
+                $a[$i] = ($a[$i] ^ 0xffff) & 0xffff;
+            }
+            ++$a[0];
+        }
+        if ($bNeg) {
+            for ($i = 0; $i < 4; ++$i) {
+                $b[$i] = ($b[$i] ^ 0xffff) & 0xffff;
+            }
+            ++$b[0];
+        }
+        $res = $this->multiplyLong($a, $b);
+        if ($aNeg !== $bNeg) {
+            if ($aNeg !== $bNeg) {
+                for ($i = 0; $i < 4; ++$i) {
+                    $res[$i] = ($res[$i] ^ 0xffff) & 0xffff;
+                }
+                $c = 1;
+                for ($i = 0; $i < 4; ++$i) {
+                    $res[$i] += $c;
+                    $c = $res[$i] >> 16;
+                    $res[$i] &= 0xffff;
+                }
+            }
+        }
+        $return = new ParagonIE_Sodium_Core32_Int64();
+        $return->limbs = array(
+            $res[3] & 0xffff,
+            $res[2] & 0xffff,
+            $res[1] & 0xffff,
+            $res[0] & 0xffff
+        );
+        if (count($res) > 4) {
+            $return->overflow = $res[4];
+        }
+        return $return;
+    }
+
+    /**
+     * @param ParagonIE_Sodium_Core32_Int64 $int
+     * @param int $size
+     * @return ParagonIE_Sodium_Core32_Int64
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedAssignment
+     */
+    public function mulInt64(ParagonIE_Sodium_Core32_Int64 $int, $size = 0)
+    {
+        if (ParagonIE_Sodium_Compat::$fastMult) {
+            return $this->mulInt64Fast($int);
+        }
+        ParagonIE_Sodium_Core32_Util::declareScalarType($size, 'int', 2);
+        if (!$size) {
+            $size = 63;
+        }
+        list($a, $b) = self::ctSelect($this, $int);
+
+        $return = new ParagonIE_Sodium_Core32_Int64();
+        $return->unsignedInt = $this->unsignedInt;
+
+        // Initialize:
+        $ret0 = 0;
+        $ret1 = 0;
+        $ret2 = 0;
+        $ret3 = 0;
+        $a0 = $a->limbs[0];
+        $a1 = $a->limbs[1];
+        $a2 = $a->limbs[2];
+        $a3 = $a->limbs[3];
+        $b0 = $b->limbs[0];
+        $b1 = $b->limbs[1];
+        $b2 = $b->limbs[2];
+        $b3 = $b->limbs[3];
+
+        /** @var int $size */
+        /** @var int $i */
+        for ($i = (int) $size; $i >= 0; --$i) {
+            $mask = -($b3 & 1);
+            $x0 = $a0 & $mask;
+            $x1 = $a1 & $mask;
+            $x2 = $a2 & $mask;
+            $x3 = $a3 & $mask;
+
+            $ret3 += $x3;
+            $c = $ret3 >> 16;
+
+            $ret2 += $x2 + $c;
+            $c = $ret2 >> 16;
+
+            $ret1 += $x1 + $c;
+            $c = $ret1 >> 16;
+
+            $ret0 += $x0 + $c;
+
+            $ret0 &= 0xffff;
+            $ret1 &= 0xffff;
+            $ret2 &= 0xffff;
+            $ret3 &= 0xffff;
+
+            $a3 = $a3 << 1;
+            $x3 = $a3 >> 16;
+            $a2 = ($a2 << 1) | $x3;
+            $x2 = $a2 >> 16;
+            $a1 = ($a1 << 1) | $x2;
+            $x1 = $a1 >> 16;
+            $a0 = ($a0 << 1) | $x1;
+            $a0 &= 0xffff;
+            $a1 &= 0xffff;
+            $a2 &= 0xffff;
+            $a3 &= 0xffff;
+
+            $x0 = ($b0 & 1) << 16;
+            $x1 = ($b1 & 1) << 16;
+            $x2 = ($b2 & 1) << 16;
+
+            $b0 = ($b0 >> 1);
+            $b1 = (($b1 | $x0) >> 1);
+            $b2 = (($b2 | $x1) >> 1);
+            $b3 = (($b3 | $x2) >> 1);
+
+            $b0 &= 0xffff;
+            $b1 &= 0xffff;
+            $b2 &= 0xffff;
+            $b3 &= 0xffff;
+
+        }
+        $return->limbs[0] = $ret0;
+        $return->limbs[1] = $ret1;
+        $return->limbs[2] = $ret2;
+        $return->limbs[3] = $ret3;
+
+        return $return;
+    }
+
+    /**
+     * OR this 64-bit integer with another.
+     *
+     * @param ParagonIE_Sodium_Core32_Int64 $b
+     * @return ParagonIE_Sodium_Core32_Int64
+     */
+    public function orInt64(ParagonIE_Sodium_Core32_Int64 $b)
+    {
+        $return = new ParagonIE_Sodium_Core32_Int64();
+        $return->unsignedInt = $this->unsignedInt;
+        $return->limbs = array(
+            (int) ($this->limbs[0] | $b->limbs[0]),
+            (int) ($this->limbs[1] | $b->limbs[1]),
+            (int) ($this->limbs[2] | $b->limbs[2]),
+            (int) ($this->limbs[3] | $b->limbs[3])
+        );
+        return $return;
+    }
+
+    /**
+     * @param int $c
+     * @return ParagonIE_Sodium_Core32_Int64
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArrayAccess
+     */
+    public function rotateLeft($c = 0)
+    {
+        ParagonIE_Sodium_Core32_Util::declareScalarType($c, 'int', 1);
+        /** @var int $c */
+        $c = (int) $c;
+
+        $return = new ParagonIE_Sodium_Core32_Int64();
+        $return->unsignedInt = $this->unsignedInt;
+        $c &= 63;
+        if ($c === 0) {
+            // NOP, but we want a copy.
+            $return->limbs = $this->limbs;
+        } else {
+            /** @var array<int, int> $limbs */
+            $limbs =& $return->limbs;
+
+            /** @var array<int, int> $myLimbs */
+            $myLimbs =& $this->limbs;
+
+            /** @var int $idx_shift */
+            $idx_shift = ($c >> 4) & 3;
+            /** @var int $sub_shift */
+            $sub_shift = $c & 15;
+
+            for ($i = 3; $i >= 0; --$i) {
+                /** @var int $j */
+                $j = ($i + $idx_shift) & 3;
+                /** @var int $k */
+                $k = ($i + $idx_shift + 1) & 3;
+                $limbs[$i] = (int) (
+                    (
+                        ((int) ($myLimbs[$j]) << $sub_shift)
+                            |
+                        ((int) ($myLimbs[$k]) >> (16 - $sub_shift))
+                    ) & 0xffff
+                );
+            }
+        }
+        return $return;
+    }
+
+    /**
+     * Rotate to the right
+     *
+     * @param int $c
+     * @return ParagonIE_Sodium_Core32_Int64
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedArrayAccess
+     */
+    public function rotateRight($c = 0)
+    {
+        ParagonIE_Sodium_Core32_Util::declareScalarType($c, 'int', 1);
+        /** @var int $c */
+        $c = (int) $c;
+
+        /** @var ParagonIE_Sodium_Core32_Int64 $return */
+        $return = new ParagonIE_Sodium_Core32_Int64();
+        $return->unsignedInt = $this->unsignedInt;
+        $c &= 63;
+        /** @var int $c */
+        if ($c === 0) {
+            // NOP, but we want a copy.
+            $return->limbs = $this->limbs;
+        } else {
+            /** @var array<int, int> $limbs */
+            $limbs =& $return->limbs;
+
+            /** @var array<int, int> $myLimbs */
+            $myLimbs =& $this->limbs;
+
+            /** @var int $idx_shift */
+            $idx_shift = ($c >> 4) & 3;
+            /** @var int $sub_shift */
+            $sub_shift = $c & 15;
+
+            for ($i = 3; $i >= 0; --$i) {
+                /** @var int $j */
+                $j = ($i - $idx_shift) & 3;
+                /** @var int $k */
+                $k = ($i - $idx_shift - 1) & 3;
+                $limbs[$i] = (int) (
+                    (
+                        ((int) ($myLimbs[$j]) >> (int) ($sub_shift))
+                            |
+                        ((int) ($myLimbs[$k]) << (16 - (int) ($sub_shift)))
+                    ) & 0xffff
+                );
+            }
+        }
+        return $return;
+    }
+    /**
+     * @param int $c
+     * @return ParagonIE_Sodium_Core32_Int64
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public function shiftLeft($c = 0)
+    {
+        ParagonIE_Sodium_Core32_Util::declareScalarType($c, 'int', 1);
+        /** @var int $c */
+        $c = (int) $c;
+
+        $return = new ParagonIE_Sodium_Core32_Int64();
+        $return->unsignedInt = $this->unsignedInt;
+        $c &= 63;
+
+        if ($c >= 16) {
+            if ($c >= 48) {
+                $return->limbs = array(
+                    $this->limbs[3], 0, 0, 0
+                );
+            } elseif ($c >= 32) {
+                $return->limbs = array(
+                    $this->limbs[2], $this->limbs[3], 0, 0
+                );
+            } else {
+                $return->limbs = array(
+                    $this->limbs[1], $this->limbs[2], $this->limbs[3], 0
+                );
+            }
+            return $return->shiftLeft($c & 15);
+        }
+        if ($c === 0) {
+            $return->limbs = $this->limbs;
+        } elseif ($c < 0) {
+            /** @var int $c */
+            return $this->shiftRight(-$c);
+        } else {
+            if (!is_int($c)) {
+                throw new TypeError();
+            }
+            /** @var int $carry */
+            $carry = 0;
+            for ($i = 3; $i >= 0; --$i) {
+                /** @var int $tmp */
+                $tmp = ($this->limbs[$i] << $c) | ($carry & 0xffff);
+                $return->limbs[$i] = (int) ($tmp & 0xffff);
+                /** @var int $carry */
+                $carry = $tmp >> 16;
+            }
+        }
+        return $return;
+    }
+
+    /**
+     * @param int $c
+     * @return ParagonIE_Sodium_Core32_Int64
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public function shiftRight($c = 0)
+    {
+        ParagonIE_Sodium_Core32_Util::declareScalarType($c, 'int', 1);
+        $c = (int) $c;
+        /** @var int $c */
+        $return = new ParagonIE_Sodium_Core32_Int64();
+        $return->unsignedInt = $this->unsignedInt;
+        $c &= 63;
+
+        $negative = -(($this->limbs[0] >> 15) & 1);
+        if ($c >= 16) {
+            if ($c >= 48) {
+                $return->limbs = array(
+                    (int) ($negative & 0xffff),
+                    (int) ($negative & 0xffff),
+                    (int) ($negative & 0xffff),
+                    (int) $this->limbs[0]
+                );
+            } elseif ($c >= 32) {
+                $return->limbs = array(
+                    (int) ($negative & 0xffff),
+                    (int) ($negative & 0xffff),
+                    (int) $this->limbs[0],
+                    (int) $this->limbs[1]
+                );
+            } else {
+                $return->limbs = array(
+                    (int) ($negative & 0xffff),
+                    (int) $this->limbs[0],
+                    (int) $this->limbs[1],
+                    (int) $this->limbs[2]
+                );
+            }
+            return $return->shiftRight($c & 15);
+        }
+
+        if ($c === 0) {
+            $return->limbs = $this->limbs;
+        } elseif ($c < 0) {
+            return $this->shiftLeft(-$c);
+        } else {
+            if (!is_int($c)) {
+                throw new TypeError();
+            }
+            /** @var int $carryRight */
+            $carryRight = ($negative & 0xffff);
+            $mask = (int) (((1 << ($c + 1)) - 1) & 0xffff);
+            for ($i = 0; $i < 4; ++$i) {
+                $return->limbs[$i] = (int) (
+                    (($this->limbs[$i] >> $c) | ($carryRight << (16 - $c))) & 0xffff
+                );
+                $carryRight = (int) ($this->limbs[$i] & $mask);
+            }
+        }
+        return $return;
+    }
+
+
+    /**
+     * Subtract a normal integer from an int64 object.
+     *
+     * @param int $int
+     * @return ParagonIE_Sodium_Core32_Int64
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public function subInt($int)
+    {
+        ParagonIE_Sodium_Core32_Util::declareScalarType($int, 'int', 1);
+        $int = (int) $int;
+
+        $return = new ParagonIE_Sodium_Core32_Int64();
+        $return->unsignedInt = $this->unsignedInt;
+
+        /** @var int $carry */
+        $carry = 0;
+        for ($i = 3; $i >= 0; --$i) {
+            /** @var int $tmp */
+            $tmp = $this->limbs[$i] - (($int >> 16) & 0xffff) + $carry;
+            /** @var int $carry */
+            $carry = $tmp >> 16;
+            $return->limbs[$i] = (int) ($tmp & 0xffff);
+        }
+        return $return;
+    }
+
+    /**
+     * The difference between two Int64 objects.
+     *
+     * @param ParagonIE_Sodium_Core32_Int64 $b
+     * @return ParagonIE_Sodium_Core32_Int64
+     */
+    public function subInt64(ParagonIE_Sodium_Core32_Int64 $b)
+    {
+        $return = new ParagonIE_Sodium_Core32_Int64();
+        $return->unsignedInt = $this->unsignedInt;
+        /** @var int $carry */
+        $carry = 0;
+        for ($i = 3; $i >= 0; --$i) {
+            /** @var int $tmp */
+            $tmp = $this->limbs[$i] - $b->limbs[$i] + $carry;
+            /** @var int $carry */
+            $carry = ($tmp >> 16);
+            $return->limbs[$i] = (int) ($tmp & 0xffff);
+        }
+        return $return;
+    }
+
+    /**
+     * XOR this 64-bit integer with another.
+     *
+     * @param ParagonIE_Sodium_Core32_Int64 $b
+     * @return ParagonIE_Sodium_Core32_Int64
+     */
+    public function xorInt64(ParagonIE_Sodium_Core32_Int64 $b)
+    {
+        $return = new ParagonIE_Sodium_Core32_Int64();
+        $return->unsignedInt = $this->unsignedInt;
+        $return->limbs = array(
+            (int) ($this->limbs[0] ^ $b->limbs[0]),
+            (int) ($this->limbs[1] ^ $b->limbs[1]),
+            (int) ($this->limbs[2] ^ $b->limbs[2]),
+            (int) ($this->limbs[3] ^ $b->limbs[3])
+        );
+        return $return;
+    }
+
+    /**
+     * @param int $low
+     * @param int $high
+     * @return self
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function fromInts($low, $high)
+    {
+        ParagonIE_Sodium_Core32_Util::declareScalarType($low, 'int', 1);
+        ParagonIE_Sodium_Core32_Util::declareScalarType($high, 'int', 2);
+
+        $high = (int) $high;
+        $low = (int) $low;
+        return new ParagonIE_Sodium_Core32_Int64(
+            array(
+                (int) (($high >> 16) & 0xffff),
+                (int) ($high & 0xffff),
+                (int) (($low >> 16) & 0xffff),
+                (int) ($low & 0xffff)
+            )
+        );
+    }
+
+    /**
+     * @param int $low
+     * @return self
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function fromInt($low)
+    {
+        ParagonIE_Sodium_Core32_Util::declareScalarType($low, 'int', 1);
+        $low = (int) $low;
+
+        return new ParagonIE_Sodium_Core32_Int64(
+            array(
+                0,
+                0,
+                (int) (($low >> 16) & 0xffff),
+                (int) ($low & 0xffff)
+            )
+        );
+    }
+
+    /**
+     * @return int
+     */
+    public function toInt()
+    {
+        return (int) (
+            (($this->limbs[2] & 0xffff) << 16)
+                |
+            ($this->limbs[3] & 0xffff)
+        );
+    }
+
+    /**
+     * @param string $string
+     * @return self
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function fromString($string)
+    {
+        ParagonIE_Sodium_Core32_Util::declareScalarType($string, 'string', 1);
+        $string = (string) $string;
+        if (ParagonIE_Sodium_Core32_Util::strlen($string) !== 8) {
+            throw new RangeException(
+                'String must be 8 bytes; ' . ParagonIE_Sodium_Core32_Util::strlen($string) . ' given.'
+            );
+        }
+        $return = new ParagonIE_Sodium_Core32_Int64();
+
+        $return->limbs[0]  = (int) ((ParagonIE_Sodium_Core32_Util::chrToInt($string[0]) & 0xff) << 8);
+        $return->limbs[0] |= (ParagonIE_Sodium_Core32_Util::chrToInt($string[1]) & 0xff);
+        $return->limbs[1]  = (int) ((ParagonIE_Sodium_Core32_Util::chrToInt($string[2]) & 0xff) << 8);
+        $return->limbs[1] |= (ParagonIE_Sodium_Core32_Util::chrToInt($string[3]) & 0xff);
+        $return->limbs[2]  = (int) ((ParagonIE_Sodium_Core32_Util::chrToInt($string[4]) & 0xff) << 8);
+        $return->limbs[2] |= (ParagonIE_Sodium_Core32_Util::chrToInt($string[5]) & 0xff);
+        $return->limbs[3]  = (int) ((ParagonIE_Sodium_Core32_Util::chrToInt($string[6]) & 0xff) << 8);
+        $return->limbs[3] |= (ParagonIE_Sodium_Core32_Util::chrToInt($string[7]) & 0xff);
+        return $return;
+    }
+
+    /**
+     * @param string $string
+     * @return self
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function fromReverseString($string)
+    {
+        ParagonIE_Sodium_Core32_Util::declareScalarType($string, 'string', 1);
+        $string = (string) $string;
+        if (ParagonIE_Sodium_Core32_Util::strlen($string) !== 8) {
+            throw new RangeException(
+                'String must be 8 bytes; ' . ParagonIE_Sodium_Core32_Util::strlen($string) . ' given.'
+            );
+        }
+        $return = new ParagonIE_Sodium_Core32_Int64();
+
+        $return->limbs[0]  = (int) ((ParagonIE_Sodium_Core32_Util::chrToInt($string[7]) & 0xff) << 8);
+        $return->limbs[0] |= (ParagonIE_Sodium_Core32_Util::chrToInt($string[6]) & 0xff);
+        $return->limbs[1]  = (int) ((ParagonIE_Sodium_Core32_Util::chrToInt($string[5]) & 0xff) << 8);
+        $return->limbs[1] |= (ParagonIE_Sodium_Core32_Util::chrToInt($string[4]) & 0xff);
+        $return->limbs[2]  = (int) ((ParagonIE_Sodium_Core32_Util::chrToInt($string[3]) & 0xff) << 8);
+        $return->limbs[2] |= (ParagonIE_Sodium_Core32_Util::chrToInt($string[2]) & 0xff);
+        $return->limbs[3]  = (int) ((ParagonIE_Sodium_Core32_Util::chrToInt($string[1]) & 0xff) << 8);
+        $return->limbs[3] |= (ParagonIE_Sodium_Core32_Util::chrToInt($string[0]) & 0xff);
+        return $return;
+    }
+
+    /**
+     * @return array<int, int>
+     */
+    public function toArray()
+    {
+        return array(
+            (int) ((($this->limbs[0] & 0xffff) << 16) | ($this->limbs[1] & 0xffff)),
+            (int) ((($this->limbs[2] & 0xffff) << 16) | ($this->limbs[3] & 0xffff))
+        );
+    }
+
+    /**
+     * @return ParagonIE_Sodium_Core32_Int32
+     */
+    public function toInt32()
+    {
+        $return = new ParagonIE_Sodium_Core32_Int32();
+        $return->limbs[0] = (int) ($this->limbs[2]);
+        $return->limbs[1] = (int) ($this->limbs[3]);
+        $return->unsignedInt = $this->unsignedInt;
+        $return->overflow = (int) (ParagonIE_Sodium_Core32_Util::abs($this->limbs[1], 16) & 0xffff);
+        return $return;
+    }
+
+    /**
+     * @return ParagonIE_Sodium_Core32_Int64
+     */
+    public function toInt64()
+    {
+        $return = new ParagonIE_Sodium_Core32_Int64();
+        $return->limbs[0] = (int) ($this->limbs[0]);
+        $return->limbs[1] = (int) ($this->limbs[1]);
+        $return->limbs[2] = (int) ($this->limbs[2]);
+        $return->limbs[3] = (int) ($this->limbs[3]);
+        $return->unsignedInt = $this->unsignedInt;
+        $return->overflow = ParagonIE_Sodium_Core32_Util::abs($this->overflow);
+        return $return;
+    }
+
+    /**
+     * @param bool $bool
+     * @return self
+     */
+    public function setUnsignedInt($bool = false)
+    {
+        $this->unsignedInt = !empty($bool);
+        return $this;
+    }
+
+    /**
+     * @return string
+     * @throws TypeError
+     */
+    public function toString()
+    {
+        return ParagonIE_Sodium_Core32_Util::intToChr(($this->limbs[0] >> 8) & 0xff) .
+            ParagonIE_Sodium_Core32_Util::intToChr($this->limbs[0] & 0xff) .
+            ParagonIE_Sodium_Core32_Util::intToChr(($this->limbs[1] >> 8) & 0xff) .
+            ParagonIE_Sodium_Core32_Util::intToChr($this->limbs[1] & 0xff) .
+            ParagonIE_Sodium_Core32_Util::intToChr(($this->limbs[2] >> 8) & 0xff) .
+            ParagonIE_Sodium_Core32_Util::intToChr($this->limbs[2] & 0xff) .
+            ParagonIE_Sodium_Core32_Util::intToChr(($this->limbs[3] >> 8) & 0xff) .
+            ParagonIE_Sodium_Core32_Util::intToChr($this->limbs[3] & 0xff);
+    }
+
+    /**
+     * @return string
+     * @throws TypeError
+     */
+    public function toReverseString()
+    {
+        return ParagonIE_Sodium_Core32_Util::intToChr($this->limbs[3] & 0xff) .
+            ParagonIE_Sodium_Core32_Util::intToChr(($this->limbs[3] >> 8) & 0xff) .
+            ParagonIE_Sodium_Core32_Util::intToChr($this->limbs[2] & 0xff) .
+            ParagonIE_Sodium_Core32_Util::intToChr(($this->limbs[2] >> 8) & 0xff) .
+            ParagonIE_Sodium_Core32_Util::intToChr($this->limbs[1] & 0xff) .
+            ParagonIE_Sodium_Core32_Util::intToChr(($this->limbs[1] >> 8) & 0xff) .
+            ParagonIE_Sodium_Core32_Util::intToChr($this->limbs[0] & 0xff) .
+            ParagonIE_Sodium_Core32_Util::intToChr(($this->limbs[0] >> 8) & 0xff);
+    }
+
+    /**
+     * @return string
+     */
+    public function __toString()
+    {
+        try {
+            return $this->toString();
+        } catch (TypeError $ex) {
+            // PHP engine can't handle exceptions from __toString()
+            return '';
+        }
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core32/Poly1305.php b/vendor/paragonie/sodium_compat/src/Core32/Poly1305.php
new file mode 100644
index 0000000..b9dfaf3
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core32/Poly1305.php
@@ -0,0 +1,63 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core32_Poly1305', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core32_Poly1305
+ */
+abstract class ParagonIE_Sodium_Core32_Poly1305 extends ParagonIE_Sodium_Core32_Util
+{
+    const BLOCK_SIZE = 16;
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $m
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function onetimeauth($m, $key)
+    {
+        if (self::strlen($key) < 32) {
+            throw new InvalidArgumentException(
+                'Key must be 32 bytes long.'
+            );
+        }
+        $state = new ParagonIE_Sodium_Core32_Poly1305_State(
+            self::substr($key, 0, 32)
+        );
+        return $state
+            ->update($m)
+            ->finish();
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $mac
+     * @param string $m
+     * @param string $key
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function onetimeauth_verify($mac, $m, $key)
+    {
+        if (self::strlen($key) < 32) {
+            throw new InvalidArgumentException(
+                'Key must be 32 bytes long.'
+            );
+        }
+        $state = new ParagonIE_Sodium_Core32_Poly1305_State(
+            self::substr($key, 0, 32)
+        );
+        $calc = $state
+            ->update($m)
+            ->finish();
+        return self::verify_16($calc, $mac);
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core32/Poly1305/State.php b/vendor/paragonie/sodium_compat/src/Core32/Poly1305/State.php
new file mode 100644
index 0000000..d80e1ff
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core32/Poly1305/State.php
@@ -0,0 +1,451 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core32_Poly1305_State', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core32_Poly1305_State
+ */
+class ParagonIE_Sodium_Core32_Poly1305_State extends ParagonIE_Sodium_Core32_Util
+{
+    /**
+     * @var array<int, int>
+     */
+    protected $buffer = array();
+
+    /**
+     * @var bool
+     */
+    protected $final = false;
+
+    /**
+     * @var array<int, ParagonIE_Sodium_Core32_Int32>
+     */
+    public $h;
+
+    /**
+     * @var int
+     */
+    protected $leftover = 0;
+
+    /**
+     * @var array<int, ParagonIE_Sodium_Core32_Int32>
+     */
+    public $r;
+
+    /**
+     * @var array<int, ParagonIE_Sodium_Core32_Int64>
+     */
+    public $pad;
+
+    /**
+     * ParagonIE_Sodium_Core32_Poly1305_State constructor.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $key
+     * @throws InvalidArgumentException
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public function __construct($key = '')
+    {
+        if (self::strlen($key) < 32) {
+            throw new InvalidArgumentException(
+                'Poly1305 requires a 32-byte key'
+            );
+        }
+        /* r &= 0xffffffc0ffffffc0ffffffc0fffffff */
+        $this->r = array(
+            // st->r[0] = ...
+            ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 0, 4))
+                ->setUnsignedInt(true)
+                ->mask(0x3ffffff),
+            // st->r[1] = ...
+            ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 3, 4))
+                ->setUnsignedInt(true)
+                ->shiftRight(2)
+                ->mask(0x3ffff03),
+            // st->r[2] = ...
+            ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 6, 4))
+                ->setUnsignedInt(true)
+                ->shiftRight(4)
+                ->mask(0x3ffc0ff),
+            // st->r[3] = ...
+            ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 9, 4))
+                ->setUnsignedInt(true)
+                ->shiftRight(6)
+                ->mask(0x3f03fff),
+            // st->r[4] = ...
+            ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 12, 4))
+                ->setUnsignedInt(true)
+                ->shiftRight(8)
+                ->mask(0x00fffff)
+        );
+
+        /* h = 0 */
+        $this->h = array(
+            new ParagonIE_Sodium_Core32_Int32(array(0, 0), true),
+            new ParagonIE_Sodium_Core32_Int32(array(0, 0), true),
+            new ParagonIE_Sodium_Core32_Int32(array(0, 0), true),
+            new ParagonIE_Sodium_Core32_Int32(array(0, 0), true),
+            new ParagonIE_Sodium_Core32_Int32(array(0, 0), true)
+        );
+
+        /* save pad for later */
+        $this->pad = array(
+            ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 16, 4))
+                ->setUnsignedInt(true)->toInt64(),
+            ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 20, 4))
+                ->setUnsignedInt(true)->toInt64(),
+            ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 24, 4))
+                ->setUnsignedInt(true)->toInt64(),
+            ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 28, 4))
+                ->setUnsignedInt(true)->toInt64(),
+        );
+
+        $this->leftover = 0;
+        $this->final = false;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $message
+     * @return self
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public function update($message = '')
+    {
+        $bytes = self::strlen($message);
+
+        /* handle leftover */
+        if ($this->leftover) {
+            /** @var int $want */
+            $want = ParagonIE_Sodium_Core32_Poly1305::BLOCK_SIZE - $this->leftover;
+            if ($want > $bytes) {
+                $want = $bytes;
+            }
+            for ($i = 0; $i < $want; ++$i) {
+                $mi = self::chrToInt($message[$i]);
+                $this->buffer[$this->leftover + $i] = $mi;
+            }
+            // We snip off the leftmost bytes.
+            $message = self::substr($message, $want);
+            $bytes = self::strlen($message);
+            $this->leftover += $want;
+            if ($this->leftover < ParagonIE_Sodium_Core32_Poly1305::BLOCK_SIZE) {
+                // We still don't have enough to run $this->blocks()
+                return $this;
+            }
+
+            $this->blocks(
+                self::intArrayToString($this->buffer),
+                ParagonIE_Sodium_Core32_Poly1305::BLOCK_SIZE
+            );
+            $this->leftover = 0;
+        }
+
+        /* process full blocks */
+        if ($bytes >= ParagonIE_Sodium_Core32_Poly1305::BLOCK_SIZE) {
+            /** @var int $want */
+            $want = $bytes & ~(ParagonIE_Sodium_Core32_Poly1305::BLOCK_SIZE - 1);
+            if ($want >= ParagonIE_Sodium_Core32_Poly1305::BLOCK_SIZE) {
+                /** @var string $block */
+                $block = self::substr($message, 0, $want);
+                if (self::strlen($block) >= ParagonIE_Sodium_Core32_Poly1305::BLOCK_SIZE) {
+                    $this->blocks($block, $want);
+                    $message = self::substr($message, $want);
+                    $bytes = self::strlen($message);
+                }
+            }
+        }
+
+        /* store leftover */
+        if ($bytes) {
+            for ($i = 0; $i < $bytes; ++$i) {
+                $mi = self::chrToInt($message[$i]);
+                $this->buffer[$this->leftover + $i] = $mi;
+            }
+            $this->leftover = (int) $this->leftover + $bytes;
+        }
+        return $this;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $message
+     * @param int $bytes
+     * @return self
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public function blocks($message, $bytes)
+    {
+        if (self::strlen($message) < 16) {
+            $message = str_pad($message, 16, "\x00", STR_PAD_RIGHT);
+        }
+        $hibit = ParagonIE_Sodium_Core32_Int32::fromInt((int) ($this->final ? 0 : 1 << 24)); /* 1 << 128 */
+        $hibit->setUnsignedInt(true);
+        $zero = new ParagonIE_Sodium_Core32_Int64(array(0, 0, 0, 0), true);
+        /**
+         * @var ParagonIE_Sodium_Core32_Int64 $d0
+         * @var ParagonIE_Sodium_Core32_Int64 $d1
+         * @var ParagonIE_Sodium_Core32_Int64 $d2
+         * @var ParagonIE_Sodium_Core32_Int64 $d3
+         * @var ParagonIE_Sodium_Core32_Int64 $d4
+         * @var ParagonIE_Sodium_Core32_Int64 $r0
+         * @var ParagonIE_Sodium_Core32_Int64 $r1
+         * @var ParagonIE_Sodium_Core32_Int64 $r2
+         * @var ParagonIE_Sodium_Core32_Int64 $r3
+         * @var ParagonIE_Sodium_Core32_Int64 $r4
+         *
+         * @var ParagonIE_Sodium_Core32_Int32 $h0
+         * @var ParagonIE_Sodium_Core32_Int32 $h1
+         * @var ParagonIE_Sodium_Core32_Int32 $h2
+         * @var ParagonIE_Sodium_Core32_Int32 $h3
+         * @var ParagonIE_Sodium_Core32_Int32 $h4
+         */
+        $r0 = $this->r[0]->toInt64();
+        $r1 = $this->r[1]->toInt64();
+        $r2 = $this->r[2]->toInt64();
+        $r3 = $this->r[3]->toInt64();
+        $r4 = $this->r[4]->toInt64();
+
+        $s1 = $r1->toInt64()->mulInt(5, 3);
+        $s2 = $r2->toInt64()->mulInt(5, 3);
+        $s3 = $r3->toInt64()->mulInt(5, 3);
+        $s4 = $r4->toInt64()->mulInt(5, 3);
+
+        $h0 = $this->h[0];
+        $h1 = $this->h[1];
+        $h2 = $this->h[2];
+        $h3 = $this->h[3];
+        $h4 = $this->h[4];
+
+        while ($bytes >= ParagonIE_Sodium_Core32_Poly1305::BLOCK_SIZE) {
+            /* h += m[i] */
+            $h0 = $h0->addInt32(
+                ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 0, 4))
+                    ->mask(0x3ffffff)
+            )->toInt64();
+            $h1 = $h1->addInt32(
+                ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 3, 4))
+                    ->shiftRight(2)
+                    ->mask(0x3ffffff)
+            )->toInt64();
+            $h2 = $h2->addInt32(
+                ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 6, 4))
+                    ->shiftRight(4)
+                    ->mask(0x3ffffff)
+            )->toInt64();
+            $h3 = $h3->addInt32(
+                ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 9, 4))
+                    ->shiftRight(6)
+                    ->mask(0x3ffffff)
+            )->toInt64();
+            $h4 = $h4->addInt32(
+                ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 12, 4))
+                    ->shiftRight(8)
+                    ->orInt32($hibit)
+            )->toInt64();
+
+            /* h *= r */
+            $d0 = $zero
+                ->addInt64($h0->mulInt64($r0, 25))
+                ->addInt64($s4->mulInt64($h1, 26))
+                ->addInt64($s3->mulInt64($h2, 26))
+                ->addInt64($s2->mulInt64($h3, 26))
+                ->addInt64($s1->mulInt64($h4, 26));
+
+            $d1 = $zero
+                ->addInt64($h0->mulInt64($r1, 25))
+                ->addInt64($h1->mulInt64($r0, 25))
+                ->addInt64($s4->mulInt64($h2, 26))
+                ->addInt64($s3->mulInt64($h3, 26))
+                ->addInt64($s2->mulInt64($h4, 26));
+
+            $d2 = $zero
+                ->addInt64($h0->mulInt64($r2, 25))
+                ->addInt64($h1->mulInt64($r1, 25))
+                ->addInt64($h2->mulInt64($r0, 25))
+                ->addInt64($s4->mulInt64($h3, 26))
+                ->addInt64($s3->mulInt64($h4, 26));
+
+            $d3 = $zero
+                ->addInt64($h0->mulInt64($r3, 25))
+                ->addInt64($h1->mulInt64($r2, 25))
+                ->addInt64($h2->mulInt64($r1, 25))
+                ->addInt64($h3->mulInt64($r0, 25))
+                ->addInt64($s4->mulInt64($h4, 26));
+
+            $d4 = $zero
+                ->addInt64($h0->mulInt64($r4, 25))
+                ->addInt64($h1->mulInt64($r3, 25))
+                ->addInt64($h2->mulInt64($r2, 25))
+                ->addInt64($h3->mulInt64($r1, 25))
+                ->addInt64($h4->mulInt64($r0, 25));
+
+            /* (partial) h %= p */
+            $c = $d0->shiftRight(26);
+            $h0 = $d0->toInt32()->mask(0x3ffffff);
+            $d1 = $d1->addInt64($c);
+
+            $c = $d1->shiftRight(26);
+            $h1 = $d1->toInt32()->mask(0x3ffffff);
+            $d2 = $d2->addInt64($c);
+
+            $c = $d2->shiftRight(26);
+            $h2 = $d2->toInt32()->mask(0x3ffffff);
+            $d3 = $d3->addInt64($c);
+
+            $c = $d3->shiftRight(26);
+            $h3 = $d3->toInt32()->mask(0x3ffffff);
+            $d4 = $d4->addInt64($c);
+
+            $c = $d4->shiftRight(26);
+            $h4 = $d4->toInt32()->mask(0x3ffffff);
+            $h0 = $h0->addInt32($c->toInt32()->mulInt(5, 3));
+
+            $c = $h0->shiftRight(26);
+            $h0 = $h0->mask(0x3ffffff);
+            $h1 = $h1->addInt32($c);
+
+            // Chop off the left 32 bytes.
+            $message = self::substr(
+                $message,
+                ParagonIE_Sodium_Core32_Poly1305::BLOCK_SIZE
+            );
+            $bytes -= ParagonIE_Sodium_Core32_Poly1305::BLOCK_SIZE;
+        }
+
+        /** @var array<int, ParagonIE_Sodium_Core32_Int32> $h */
+        $this->h = array($h0, $h1, $h2, $h3, $h4);
+        return $this;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public function finish()
+    {
+        /* process the remaining block */
+        if ($this->leftover) {
+            $i = $this->leftover;
+            $this->buffer[$i++] = 1;
+            for (; $i < ParagonIE_Sodium_Core32_Poly1305::BLOCK_SIZE; ++$i) {
+                $this->buffer[$i] = 0;
+            }
+            $this->final = true;
+            $this->blocks(
+                self::substr(
+                    self::intArrayToString($this->buffer),
+                    0,
+                    ParagonIE_Sodium_Core32_Poly1305::BLOCK_SIZE
+                ),
+                $b = ParagonIE_Sodium_Core32_Poly1305::BLOCK_SIZE
+            );
+        }
+
+        /**
+         * @var ParagonIE_Sodium_Core32_Int32 $f
+         * @var ParagonIE_Sodium_Core32_Int32 $g0
+         * @var ParagonIE_Sodium_Core32_Int32 $g1
+         * @var ParagonIE_Sodium_Core32_Int32 $g2
+         * @var ParagonIE_Sodium_Core32_Int32 $g3
+         * @var ParagonIE_Sodium_Core32_Int32 $g4
+         * @var ParagonIE_Sodium_Core32_Int32 $h0
+         * @var ParagonIE_Sodium_Core32_Int32 $h1
+         * @var ParagonIE_Sodium_Core32_Int32 $h2
+         * @var ParagonIE_Sodium_Core32_Int32 $h3
+         * @var ParagonIE_Sodium_Core32_Int32 $h4
+         */
+        $h0 = $this->h[0];
+        $h1 = $this->h[1];
+        $h2 = $this->h[2];
+        $h3 = $this->h[3];
+        $h4 = $this->h[4];
+
+        $c = $h1->shiftRight(26);           # $c = $h1 >> 26;
+        $h1 = $h1->mask(0x3ffffff);         # $h1 &= 0x3ffffff;
+
+        $h2 = $h2->addInt32($c);            # $h2 += $c;
+        $c = $h2->shiftRight(26);           # $c = $h2 >> 26;
+        $h2 = $h2->mask(0x3ffffff);         # $h2 &= 0x3ffffff;
+
+        $h3 = $h3->addInt32($c);            # $h3 += $c;
+        $c = $h3->shiftRight(26);           # $c = $h3 >> 26;
+        $h3 = $h3->mask(0x3ffffff);         # $h3 &= 0x3ffffff;
+
+        $h4 = $h4->addInt32($c);            # $h4 += $c;
+        $c = $h4->shiftRight(26);           # $c = $h4 >> 26;
+        $h4 = $h4->mask(0x3ffffff);         # $h4 &= 0x3ffffff;
+
+        $h0 = $h0->addInt32($c->mulInt(5, 3)); # $h0 += self::mul($c, 5);
+        $c = $h0->shiftRight(26);           # $c = $h0 >> 26;
+        $h0 = $h0->mask(0x3ffffff);         # $h0 &= 0x3ffffff;
+        $h1 = $h1->addInt32($c);            # $h1 += $c;
+
+        /* compute h + -p */
+        $g0 = $h0->addInt(5);
+        $c  = $g0->shiftRight(26);
+        $g0 = $g0->mask(0x3ffffff);
+        $g1 = $h1->addInt32($c);
+        $c  = $g1->shiftRight(26);
+        $g1 = $g1->mask(0x3ffffff);
+        $g2 = $h2->addInt32($c);
+        $c  = $g2->shiftRight(26);
+        $g2 = $g2->mask(0x3ffffff);
+        $g3 = $h3->addInt32($c);
+        $c  = $g3->shiftRight(26);
+        $g3 = $g3->mask(0x3ffffff);
+        $g4 = $h4->addInt32($c)->subInt(1 << 26);
+
+        # $mask = ($g4 >> 31) - 1;
+        /* select h if h < p, or h + -p if h >= p */
+        $mask = (int) (($g4->toInt() >> 31) + 1);
+
+        $g0 = $g0->mask($mask);
+        $g1 = $g1->mask($mask);
+        $g2 = $g2->mask($mask);
+        $g3 = $g3->mask($mask);
+        $g4 = $g4->mask($mask);
+
+        /** @var int $mask */
+        $mask = (~$mask) & 0xffffffff;
+
+        $h0 = $h0->mask($mask)->orInt32($g0);
+        $h1 = $h1->mask($mask)->orInt32($g1);
+        $h2 = $h2->mask($mask)->orInt32($g2);
+        $h3 = $h3->mask($mask)->orInt32($g3);
+        $h4 = $h4->mask($mask)->orInt32($g4);
+
+        /* h = h % (2^128) */
+        $h0 = $h0->orInt32($h1->shiftLeft(26));
+        $h1 = $h1->shiftRight(6)->orInt32($h2->shiftLeft(20));
+        $h2 = $h2->shiftRight(12)->orInt32($h3->shiftLeft(14));
+        $h3 = $h3->shiftRight(18)->orInt32($h4->shiftLeft(8));
+
+        /* mac = (h + pad) % (2^128) */
+        $f = $h0->toInt64()->addInt64($this->pad[0]);
+        $h0 = $f->toInt32();
+        $f = $h1->toInt64()->addInt64($this->pad[1])->addInt($h0->overflow);
+        $h1 = $f->toInt32();
+        $f = $h2->toInt64()->addInt64($this->pad[2])->addInt($h1->overflow);
+        $h2 = $f->toInt32();
+        $f = $h3->toInt64()->addInt64($this->pad[3])->addInt($h2->overflow);
+        $h3 = $f->toInt32();
+
+        return $h0->toReverseString() .
+            $h1->toReverseString() .
+            $h2->toReverseString() .
+            $h3->toReverseString();
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core32/Salsa20.php b/vendor/paragonie/sodium_compat/src/Core32/Salsa20.php
new file mode 100644
index 0000000..d8c8073
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core32/Salsa20.php
@@ -0,0 +1,306 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core32_Salsa20', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core32_Salsa20
+ */
+abstract class ParagonIE_Sodium_Core32_Salsa20 extends ParagonIE_Sodium_Core32_Util
+{
+    const ROUNDS = 20;
+
+    /**
+     * Calculate an salsa20 hash of a single block
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $in
+     * @param string $k
+     * @param string|null $c
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function core_salsa20($in, $k, $c = null)
+    {
+        /**
+         * @var ParagonIE_Sodium_Core32_Int32 $x0
+         * @var ParagonIE_Sodium_Core32_Int32 $x1
+         * @var ParagonIE_Sodium_Core32_Int32 $x2
+         * @var ParagonIE_Sodium_Core32_Int32 $x3
+         * @var ParagonIE_Sodium_Core32_Int32 $x4
+         * @var ParagonIE_Sodium_Core32_Int32 $x5
+         * @var ParagonIE_Sodium_Core32_Int32 $x6
+         * @var ParagonIE_Sodium_Core32_Int32 $x7
+         * @var ParagonIE_Sodium_Core32_Int32 $x8
+         * @var ParagonIE_Sodium_Core32_Int32 $x9
+         * @var ParagonIE_Sodium_Core32_Int32 $x10
+         * @var ParagonIE_Sodium_Core32_Int32 $x11
+         * @var ParagonIE_Sodium_Core32_Int32 $x12
+         * @var ParagonIE_Sodium_Core32_Int32 $x13
+         * @var ParagonIE_Sodium_Core32_Int32 $x14
+         * @var ParagonIE_Sodium_Core32_Int32 $x15
+         * @var ParagonIE_Sodium_Core32_Int32 $j0
+         * @var ParagonIE_Sodium_Core32_Int32 $j1
+         * @var ParagonIE_Sodium_Core32_Int32 $j2
+         * @var ParagonIE_Sodium_Core32_Int32 $j3
+         * @var ParagonIE_Sodium_Core32_Int32 $j4
+         * @var ParagonIE_Sodium_Core32_Int32 $j5
+         * @var ParagonIE_Sodium_Core32_Int32 $j6
+         * @var ParagonIE_Sodium_Core32_Int32 $j7
+         * @var ParagonIE_Sodium_Core32_Int32 $j8
+         * @var ParagonIE_Sodium_Core32_Int32 $j9
+         * @var ParagonIE_Sodium_Core32_Int32 $j10
+         * @var ParagonIE_Sodium_Core32_Int32 $j11
+         * @var ParagonIE_Sodium_Core32_Int32 $j12
+         * @var ParagonIE_Sodium_Core32_Int32 $j13
+         * @var ParagonIE_Sodium_Core32_Int32 $j14
+         * @var ParagonIE_Sodium_Core32_Int32 $j15
+         */
+        if (self::strlen($k) < 32) {
+            throw new RangeException('Key must be 32 bytes long');
+        }
+        if ($c === null) {
+            $x0  = new ParagonIE_Sodium_Core32_Int32(array(0x6170, 0x7865));
+            $x5  = new ParagonIE_Sodium_Core32_Int32(array(0x3320, 0x646e));
+            $x10 = new ParagonIE_Sodium_Core32_Int32(array(0x7962, 0x2d32));
+            $x15 = new ParagonIE_Sodium_Core32_Int32(array(0x6b20, 0x6574));
+        } else {
+            $x0  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($c, 0, 4));
+            $x5  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($c, 4, 4));
+            $x10 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($c, 8, 4));
+            $x15 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($c, 12, 4));
+        }
+        $x1  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($k, 0, 4));
+        $x2  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($k, 4, 4));
+        $x3  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($k, 8, 4));
+        $x4  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($k, 12, 4));
+        $x6  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($in, 0, 4));
+        $x7  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($in, 4, 4));
+        $x8  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($in, 8, 4));
+        $x9  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($in, 12, 4));
+        $x11 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($k, 16, 4));
+        $x12 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($k, 20, 4));
+        $x13 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($k, 24, 4));
+        $x14 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($k, 28, 4));
+
+        $j0  = clone $x0;
+        $j1  = clone $x1;
+        $j2  = clone $x2;
+        $j3  = clone $x3;
+        $j4  = clone $x4;
+        $j5  = clone $x5;
+        $j6  = clone $x6;
+        $j7  = clone $x7;
+        $j8  = clone $x8;
+        $j9  = clone $x9;
+        $j10  = clone $x10;
+        $j11  = clone $x11;
+        $j12  = clone $x12;
+        $j13  = clone $x13;
+        $j14  = clone $x14;
+        $j15  = clone $x15;
+
+        for ($i = self::ROUNDS; $i > 0; $i -= 2) {
+            $x4  = $x4->xorInt32($x0->addInt32($x12)->rotateLeft(7));
+            $x8  = $x8->xorInt32($x4->addInt32($x0)->rotateLeft(9));
+            $x12 = $x12->xorInt32($x8->addInt32($x4)->rotateLeft(13));
+            $x0  = $x0->xorInt32($x12->addInt32($x8)->rotateLeft(18));
+
+            $x9  = $x9->xorInt32($x5->addInt32($x1)->rotateLeft(7));
+            $x13 = $x13->xorInt32($x9->addInt32($x5)->rotateLeft(9));
+            $x1  = $x1->xorInt32($x13->addInt32($x9)->rotateLeft(13));
+            $x5  = $x5->xorInt32($x1->addInt32($x13)->rotateLeft(18));
+
+            $x14 = $x14->xorInt32($x10->addInt32($x6)->rotateLeft(7));
+            $x2  = $x2->xorInt32($x14->addInt32($x10)->rotateLeft(9));
+            $x6  = $x6->xorInt32($x2->addInt32($x14)->rotateLeft(13));
+            $x10 = $x10->xorInt32($x6->addInt32($x2)->rotateLeft(18));
+
+            $x3  = $x3->xorInt32($x15->addInt32($x11)->rotateLeft(7));
+            $x7  = $x7->xorInt32($x3->addInt32($x15)->rotateLeft(9));
+            $x11 = $x11->xorInt32($x7->addInt32($x3)->rotateLeft(13));
+            $x15 = $x15->xorInt32($x11->addInt32($x7)->rotateLeft(18));
+
+            $x1  = $x1->xorInt32($x0->addInt32($x3)->rotateLeft(7));
+            $x2  = $x2->xorInt32($x1->addInt32($x0)->rotateLeft(9));
+            $x3  = $x3->xorInt32($x2->addInt32($x1)->rotateLeft(13));
+            $x0  = $x0->xorInt32($x3->addInt32($x2)->rotateLeft(18));
+
+            $x6  = $x6->xorInt32($x5->addInt32($x4)->rotateLeft(7));
+            $x7  = $x7->xorInt32($x6->addInt32($x5)->rotateLeft(9));
+            $x4  = $x4->xorInt32($x7->addInt32($x6)->rotateLeft(13));
+            $x5  = $x5->xorInt32($x4->addInt32($x7)->rotateLeft(18));
+
+            $x11 = $x11->xorInt32($x10->addInt32($x9)->rotateLeft(7));
+            $x8  = $x8->xorInt32($x11->addInt32($x10)->rotateLeft(9));
+            $x9  = $x9->xorInt32($x8->addInt32($x11)->rotateLeft(13));
+            $x10 = $x10->xorInt32($x9->addInt32($x8)->rotateLeft(18));
+
+            $x12 = $x12->xorInt32($x15->addInt32($x14)->rotateLeft(7));
+            $x13 = $x13->xorInt32($x12->addInt32($x15)->rotateLeft(9));
+            $x14 = $x14->xorInt32($x13->addInt32($x12)->rotateLeft(13));
+            $x15 = $x15->xorInt32($x14->addInt32($x13)->rotateLeft(18));
+        }
+
+        $x0  = $x0->addInt32($j0);
+        $x1  = $x1->addInt32($j1);
+        $x2  = $x2->addInt32($j2);
+        $x3  = $x3->addInt32($j3);
+        $x4  = $x4->addInt32($j4);
+        $x5  = $x5->addInt32($j5);
+        $x6  = $x6->addInt32($j6);
+        $x7  = $x7->addInt32($j7);
+        $x8  = $x8->addInt32($j8);
+        $x9  = $x9->addInt32($j9);
+        $x10 = $x10->addInt32($j10);
+        $x11 = $x11->addInt32($j11);
+        $x12 = $x12->addInt32($j12);
+        $x13 = $x13->addInt32($j13);
+        $x14 = $x14->addInt32($j14);
+        $x15 = $x15->addInt32($j15);
+
+        return $x0->toReverseString() .
+            $x1->toReverseString() .
+            $x2->toReverseString() .
+            $x3->toReverseString() .
+            $x4->toReverseString() .
+            $x5->toReverseString() .
+            $x6->toReverseString() .
+            $x7->toReverseString() .
+            $x8->toReverseString() .
+            $x9->toReverseString() .
+            $x10->toReverseString() .
+            $x11->toReverseString() .
+            $x12->toReverseString() .
+            $x13->toReverseString() .
+            $x14->toReverseString() .
+            $x15->toReverseString();
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param int $len
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function salsa20($len, $nonce, $key)
+    {
+        if (self::strlen($key) !== 32) {
+            throw new RangeException('Key must be 32 bytes long');
+        }
+        $kcopy = '' . $key;
+        $in = self::substr($nonce, 0, 8) . str_repeat("\0", 8);
+        $c = '';
+        while ($len >= 64) {
+            $c .= self::core_salsa20($in, $kcopy, null);
+            $u = 1;
+            // Internal counter.
+            for ($i = 8; $i < 16; ++$i) {
+                $u += self::chrToInt($in[$i]);
+                $in[$i] = self::intToChr($u & 0xff);
+                $u >>= 8;
+            }
+            $len -= 64;
+        }
+        if ($len > 0) {
+            $c .= self::substr(
+                self::core_salsa20($in, $kcopy, null),
+                0,
+                $len
+            );
+        }
+        try {
+            ParagonIE_Sodium_Compat::memzero($kcopy);
+        } catch (SodiumException $ex) {
+            $kcopy = null;
+        }
+        return $c;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $m
+     * @param string $n
+     * @param int $ic
+     * @param string $k
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function salsa20_xor_ic($m, $n, $ic, $k)
+    {
+        $mlen = self::strlen($m);
+        if ($mlen < 1) {
+            return '';
+        }
+        $kcopy = self::substr($k, 0, 32);
+        $in = self::substr($n, 0, 8);
+        // Initialize the counter
+        $in .= ParagonIE_Sodium_Core32_Util::store64_le($ic);
+
+        $c = '';
+        while ($mlen >= 64) {
+            $block = self::core_salsa20($in, $kcopy, null);
+            $c .= self::xorStrings(
+                self::substr($m, 0, 64),
+                self::substr($block, 0, 64)
+            );
+            $u = 1;
+            for ($i = 8; $i < 16; ++$i) {
+                $u += self::chrToInt($in[$i]);
+                $in[$i] = self::intToChr($u & 0xff);
+                $u >>= 8;
+            }
+
+            $mlen -= 64;
+            $m = self::substr($m, 64);
+        }
+
+        if ($mlen) {
+            $block = self::core_salsa20($in, $kcopy, null);
+            $c .= self::xorStrings(
+                self::substr($m, 0, $mlen),
+                self::substr($block, 0, $mlen)
+            );
+        }
+        try {
+            ParagonIE_Sodium_Compat::memzero($block);
+            ParagonIE_Sodium_Compat::memzero($kcopy);
+        } catch (SodiumException $ex) {
+            $block = null;
+            $kcopy = null;
+        }
+
+        return $c;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $message
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function salsa20_xor($message, $nonce, $key)
+    {
+        return self::xorStrings(
+            $message,
+            self::salsa20(
+                self::strlen($message),
+                $nonce,
+                $key
+            )
+        );
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core32/SecretStream/State.php b/vendor/paragonie/sodium_compat/src/Core32/SecretStream/State.php
new file mode 100644
index 0000000..6f20486
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core32/SecretStream/State.php
@@ -0,0 +1,163 @@
+<?php
+
+/**
+ * Class ParagonIE_Sodium_Core32_SecretStream_State
+ */
+class ParagonIE_Sodium_Core32_SecretStream_State
+{
+    /** @var string $key */
+    protected $key;
+
+    /** @var int $counter */
+    protected $counter;
+
+    /** @var string $nonce */
+    protected $nonce;
+
+    /** @var string $_pad */
+    protected $_pad;
+
+    /**
+     * ParagonIE_Sodium_Core32_SecretStream_State constructor.
+     * @param string $key
+     * @param string|null $nonce
+     */
+    public function __construct($key, $nonce = null)
+    {
+        $this->key = $key;
+        $this->counter = 1;
+        if (is_null($nonce)) {
+            $nonce = str_repeat("\0", 12);
+        }
+        $this->nonce = str_pad($nonce, 12, "\0", STR_PAD_RIGHT);;
+        $this->_pad = str_repeat("\0", 4);
+    }
+
+    /**
+     * @return self
+     */
+    public function counterReset()
+    {
+        $this->counter = 1;
+        $this->_pad = str_repeat("\0", 4);
+        return $this;
+    }
+
+    /**
+     * @return string
+     */
+    public function getKey()
+    {
+        return $this->key;
+    }
+
+    /**
+     * @return string
+     */
+    public function getCounter()
+    {
+        return ParagonIE_Sodium_Core32_Util::store32_le($this->counter);
+    }
+
+    /**
+     * @return string
+     */
+    public function getNonce()
+    {
+        if (!is_string($this->nonce)) {
+            $this->nonce = str_repeat("\0", 12);
+        }
+        if (ParagonIE_Sodium_Core32_Util::strlen($this->nonce) !== 12) {
+            $this->nonce = str_pad($this->nonce, 12, "\0", STR_PAD_RIGHT);
+        }
+        return $this->nonce;
+    }
+
+    /**
+     * @return string
+     */
+    public function getCombinedNonce()
+    {
+        return $this->getCounter() .
+            ParagonIE_Sodium_Core32_Util::substr($this->getNonce(), 0, 8);
+    }
+
+    /**
+     * @return self
+     */
+    public function incrementCounter()
+    {
+        ++$this->counter;
+        return $this;
+    }
+
+    /**
+     * @return bool
+     */
+    public function needsRekey()
+    {
+        return ($this->counter & 0xffff) === 0;
+    }
+
+    /**
+     * @param string $newKeyAndNonce
+     * @return self
+     */
+    public function rekey($newKeyAndNonce)
+    {
+        $this->key = ParagonIE_Sodium_Core32_Util::substr($newKeyAndNonce, 0, 32);
+        $this->nonce = str_pad(
+            ParagonIE_Sodium_Core32_Util::substr($newKeyAndNonce, 32),
+            12,
+            "\0",
+            STR_PAD_RIGHT
+        );
+        return $this;
+    }
+
+    /**
+     * @param string $str
+     * @return self
+     */
+    public function xorNonce($str)
+    {
+        $this->nonce = ParagonIE_Sodium_Core32_Util::xorStrings(
+            $this->getNonce(),
+            str_pad(
+                ParagonIE_Sodium_Core32_Util::substr($str, 0, 8),
+                12,
+                "\0",
+                STR_PAD_RIGHT
+            )
+        );
+        return $this;
+    }
+
+    /**
+     * @param string $string
+     * @return self
+     */
+    public static function fromString($string)
+    {
+        $state = new ParagonIE_Sodium_Core32_SecretStream_State(
+            ParagonIE_Sodium_Core32_Util::substr($string, 0, 32)
+        );
+        $state->counter = ParagonIE_Sodium_Core32_Util::load_4(
+            ParagonIE_Sodium_Core32_Util::substr($string, 32, 4)
+        );
+        $state->nonce = ParagonIE_Sodium_Core32_Util::substr($string, 36, 12);
+        $state->_pad = ParagonIE_Sodium_Core32_Util::substr($string, 48, 8);
+        return $state;
+    }
+
+    /**
+     * @return string
+     */
+    public function toString()
+    {
+        return $this->key .
+            $this->getCounter() .
+            $this->nonce .
+            $this->_pad;
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core32/SipHash.php b/vendor/paragonie/sodium_compat/src/Core32/SipHash.php
new file mode 100644
index 0000000..079946d
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core32/SipHash.php
@@ -0,0 +1,238 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core32_SipHash', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_SodiumCompat_Core32_SipHash
+ *
+ * Only uses 32-bit arithmetic, while the original SipHash used 64-bit integers
+ */
+class ParagonIE_Sodium_Core32_SipHash extends ParagonIE_Sodium_Core32_Util
+{
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param array<int, ParagonIE_Sodium_Core32_Int64> $v
+     * @return array<int, ParagonIE_Sodium_Core32_Int64>
+     */
+    public static function sipRound(array $v)
+    {
+        # v0 += v1;
+        $v[0] = $v[0]->addInt64($v[1]);
+
+        # v1 = ROTL(v1, 13);
+        $v[1] = $v[1]->rotateLeft(13);
+
+        #  v1 ^= v0;
+        $v[1] = $v[1]->xorInt64($v[0]);
+
+        #  v0=ROTL(v0,32);
+        $v[0] = $v[0]->rotateLeft(32);
+
+        # v2 += v3;
+        $v[2] = $v[2]->addInt64($v[3]);
+
+        # v3=ROTL(v3,16);
+        $v[3] = $v[3]->rotateLeft(16);
+
+        #  v3 ^= v2;
+        $v[3] = $v[3]->xorInt64($v[2]);
+
+        # v0 += v3;
+        $v[0] = $v[0]->addInt64($v[3]);
+
+        # v3=ROTL(v3,21);
+        $v[3] = $v[3]->rotateLeft(21);
+
+        # v3 ^= v0;
+        $v[3] = $v[3]->xorInt64($v[0]);
+
+        # v2 += v1;
+        $v[2] = $v[2]->addInt64($v[1]);
+
+        # v1=ROTL(v1,17);
+        $v[1] = $v[1]->rotateLeft(17);
+
+        #  v1 ^= v2;
+        $v[1] = $v[1]->xorInt64($v[2]);
+
+        # v2=ROTL(v2,32)
+        $v[2] = $v[2]->rotateLeft(32);
+
+        return $v;
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $in
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function sipHash24($in, $key)
+    {
+        $inlen = self::strlen($in);
+
+        # /* "somepseudorandomlygeneratedbytes" */
+        # u64 v0 = 0x736f6d6570736575ULL;
+        # u64 v1 = 0x646f72616e646f6dULL;
+        # u64 v2 = 0x6c7967656e657261ULL;
+        # u64 v3 = 0x7465646279746573ULL;
+        $v = array(
+            new ParagonIE_Sodium_Core32_Int64(
+                array(0x736f, 0x6d65, 0x7073, 0x6575)
+            ),
+            new ParagonIE_Sodium_Core32_Int64(
+                array(0x646f, 0x7261, 0x6e64, 0x6f6d)
+            ),
+            new ParagonIE_Sodium_Core32_Int64(
+                array(0x6c79, 0x6765, 0x6e65, 0x7261)
+            ),
+            new ParagonIE_Sodium_Core32_Int64(
+                array(0x7465, 0x6462, 0x7974, 0x6573)
+            )
+        );
+
+        # u64 k0 = LOAD64_LE( k );
+        # u64 k1 = LOAD64_LE( k + 8 );
+        $k = array(
+            ParagonIE_Sodium_Core32_Int64::fromReverseString(
+                self::substr($key, 0, 8)
+            ),
+            ParagonIE_Sodium_Core32_Int64::fromReverseString(
+                self::substr($key, 8, 8)
+            )
+        );
+
+        # b = ( ( u64 )inlen ) << 56;
+        $b = new ParagonIE_Sodium_Core32_Int64(
+            array(($inlen << 8) & 0xffff, 0, 0, 0)
+        );
+
+        # v3 ^= k1;
+        $v[3] = $v[3]->xorInt64($k[1]);
+        # v2 ^= k0;
+        $v[2] = $v[2]->xorInt64($k[0]);
+        # v1 ^= k1;
+        $v[1] = $v[1]->xorInt64($k[1]);
+        # v0 ^= k0;
+        $v[0] = $v[0]->xorInt64($k[0]);
+
+        $left = $inlen;
+        # for ( ; in != end; in += 8 )
+        while ($left >= 8) {
+            # m = LOAD64_LE( in );
+            $m = ParagonIE_Sodium_Core32_Int64::fromReverseString(
+                self::substr($in, 0, 8)
+            );
+
+            # v3 ^= m;
+            $v[3] = $v[3]->xorInt64($m);
+
+            # SIPROUND;
+            # SIPROUND;
+            $v = self::sipRound($v);
+            $v = self::sipRound($v);
+
+            # v0 ^= m;
+            $v[0] = $v[0]->xorInt64($m);
+
+            $in = self::substr($in, 8);
+            $left -= 8;
+        }
+
+        # switch( left )
+        #  {
+        #     case 7: b |= ( ( u64 )in[ 6] )  << 48;
+        #     case 6: b |= ( ( u64 )in[ 5] )  << 40;
+        #     case 5: b |= ( ( u64 )in[ 4] )  << 32;
+        #     case 4: b |= ( ( u64 )in[ 3] )  << 24;
+        #     case 3: b |= ( ( u64 )in[ 2] )  << 16;
+        #     case 2: b |= ( ( u64 )in[ 1] )  <<  8;
+        #     case 1: b |= ( ( u64 )in[ 0] ); break;
+        #     case 0: break;
+        # }
+        switch ($left) {
+            case 7:
+                $b = $b->orInt64(
+                    ParagonIE_Sodium_Core32_Int64::fromInts(
+                        0, self::chrToInt($in[6]) << 16
+                    )
+                );
+            case 6:
+                $b = $b->orInt64(
+                    ParagonIE_Sodium_Core32_Int64::fromInts(
+                        0, self::chrToInt($in[5]) << 8
+                    )
+                );
+            case 5:
+                $b = $b->orInt64(
+                    ParagonIE_Sodium_Core32_Int64::fromInts(
+                        0, self::chrToInt($in[4])
+                    )
+                );
+            case 4:
+                $b = $b->orInt64(
+                    ParagonIE_Sodium_Core32_Int64::fromInts(
+                        self::chrToInt($in[3]) << 24, 0
+                    )
+                );
+            case 3:
+                $b = $b->orInt64(
+                    ParagonIE_Sodium_Core32_Int64::fromInts(
+                        self::chrToInt($in[2]) << 16, 0
+                    )
+                );
+            case 2:
+                $b = $b->orInt64(
+                    ParagonIE_Sodium_Core32_Int64::fromInts(
+                        self::chrToInt($in[1]) << 8, 0
+                    )
+                );
+            case 1:
+                $b = $b->orInt64(
+                    ParagonIE_Sodium_Core32_Int64::fromInts(
+                        self::chrToInt($in[0]), 0
+                    )
+                );
+            case 0:
+                break;
+        }
+
+        # v3 ^= b;
+        $v[3] = $v[3]->xorInt64($b);
+
+        # SIPROUND;
+        # SIPROUND;
+        $v = self::sipRound($v);
+        $v = self::sipRound($v);
+
+        # v0 ^= b;
+        $v[0] = $v[0]->xorInt64($b);
+
+        // Flip the lower 8 bits of v2 which is ($v[4], $v[5]) in our implementation
+        # v2 ^= 0xff;
+        $v[2]->limbs[3] ^= 0xff;
+
+        # SIPROUND;
+        # SIPROUND;
+        # SIPROUND;
+        # SIPROUND;
+        $v = self::sipRound($v);
+        $v = self::sipRound($v);
+        $v = self::sipRound($v);
+        $v = self::sipRound($v);
+
+        # b = v0 ^ v1 ^ v2 ^ v3;
+        # STORE64_LE( out, b );
+        return $v[0]
+            ->xorInt64($v[1])
+            ->xorInt64($v[2])
+            ->xorInt64($v[3])
+            ->toReverseString();
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core32/Util.php b/vendor/paragonie/sodium_compat/src/Core32/Util.php
new file mode 100644
index 0000000..f32e5ad
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core32/Util.php
@@ -0,0 +1,13 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core32_Util', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core_Util
+ */
+abstract class ParagonIE_Sodium_Core32_Util extends ParagonIE_Sodium_Core_Util
+{
+
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core32/X25519.php b/vendor/paragonie/sodium_compat/src/Core32/X25519.php
new file mode 100644
index 0000000..2cc000d
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core32/X25519.php
@@ -0,0 +1,345 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core32_X25519', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core32_X25519
+ */
+abstract class ParagonIE_Sodium_Core32_X25519 extends ParagonIE_Sodium_Core32_Curve25519
+{
+    /**
+     * Alters the objects passed to this method in place.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe $f
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe $g
+     * @param int $b
+     * @return void
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedMethodCall
+     */
+    public static function fe_cswap(
+        ParagonIE_Sodium_Core32_Curve25519_Fe $f,
+        ParagonIE_Sodium_Core32_Curve25519_Fe $g,
+        $b = 0
+    ) {
+        $f0 = (int) $f[0]->toInt();
+        $f1 = (int) $f[1]->toInt();
+        $f2 = (int) $f[2]->toInt();
+        $f3 = (int) $f[3]->toInt();
+        $f4 = (int) $f[4]->toInt();
+        $f5 = (int) $f[5]->toInt();
+        $f6 = (int) $f[6]->toInt();
+        $f7 = (int) $f[7]->toInt();
+        $f8 = (int) $f[8]->toInt();
+        $f9 = (int) $f[9]->toInt();
+        $g0 = (int) $g[0]->toInt();
+        $g1 = (int) $g[1]->toInt();
+        $g2 = (int) $g[2]->toInt();
+        $g3 = (int) $g[3]->toInt();
+        $g4 = (int) $g[4]->toInt();
+        $g5 = (int) $g[5]->toInt();
+        $g6 = (int) $g[6]->toInt();
+        $g7 = (int) $g[7]->toInt();
+        $g8 = (int) $g[8]->toInt();
+        $g9 = (int) $g[9]->toInt();
+        $b = -$b;
+        /** @var int $x0 */
+        $x0 = ($f0 ^ $g0) & $b;
+        /** @var int $x1 */
+        $x1 = ($f1 ^ $g1) & $b;
+        /** @var int $x2 */
+        $x2 = ($f2 ^ $g2) & $b;
+        /** @var int $x3 */
+        $x3 = ($f3 ^ $g3) & $b;
+        /** @var int $x4 */
+        $x4 = ($f4 ^ $g4) & $b;
+        /** @var int $x5 */
+        $x5 = ($f5 ^ $g5) & $b;
+        /** @var int $x6 */
+        $x6 = ($f6 ^ $g6) & $b;
+        /** @var int $x7 */
+        $x7 = ($f7 ^ $g7) & $b;
+        /** @var int $x8 */
+        $x8 = ($f8 ^ $g8) & $b;
+        /** @var int $x9 */
+        $x9 = ($f9 ^ $g9) & $b;
+        $f[0] = ParagonIE_Sodium_Core32_Int32::fromInt($f0 ^ $x0);
+        $f[1] = ParagonIE_Sodium_Core32_Int32::fromInt($f1 ^ $x1);
+        $f[2] = ParagonIE_Sodium_Core32_Int32::fromInt($f2 ^ $x2);
+        $f[3] = ParagonIE_Sodium_Core32_Int32::fromInt($f3 ^ $x3);
+        $f[4] = ParagonIE_Sodium_Core32_Int32::fromInt($f4 ^ $x4);
+        $f[5] = ParagonIE_Sodium_Core32_Int32::fromInt($f5 ^ $x5);
+        $f[6] = ParagonIE_Sodium_Core32_Int32::fromInt($f6 ^ $x6);
+        $f[7] = ParagonIE_Sodium_Core32_Int32::fromInt($f7 ^ $x7);
+        $f[8] = ParagonIE_Sodium_Core32_Int32::fromInt($f8 ^ $x8);
+        $f[9] = ParagonIE_Sodium_Core32_Int32::fromInt($f9 ^ $x9);
+        $g[0] = ParagonIE_Sodium_Core32_Int32::fromInt($g0 ^ $x0);
+        $g[1] = ParagonIE_Sodium_Core32_Int32::fromInt($g1 ^ $x1);
+        $g[2] = ParagonIE_Sodium_Core32_Int32::fromInt($g2 ^ $x2);
+        $g[3] = ParagonIE_Sodium_Core32_Int32::fromInt($g3 ^ $x3);
+        $g[4] = ParagonIE_Sodium_Core32_Int32::fromInt($g4 ^ $x4);
+        $g[5] = ParagonIE_Sodium_Core32_Int32::fromInt($g5 ^ $x5);
+        $g[6] = ParagonIE_Sodium_Core32_Int32::fromInt($g6 ^ $x6);
+        $g[7] = ParagonIE_Sodium_Core32_Int32::fromInt($g7 ^ $x7);
+        $g[8] = ParagonIE_Sodium_Core32_Int32::fromInt($g8 ^ $x8);
+        $g[9] = ParagonIE_Sodium_Core32_Int32::fromInt($g9 ^ $x9);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe $f
+     * @return ParagonIE_Sodium_Core32_Curve25519_Fe
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress MixedAssignment
+     * @psalm-suppress MixedMethodCall
+     */
+    public static function fe_mul121666(ParagonIE_Sodium_Core32_Curve25519_Fe $f)
+    {
+        /** @var array<int, ParagonIE_Sodium_Core32_Int64> $h */
+        $h = array();
+        for ($i = 0; $i < 10; ++$i) {
+            $h[$i] = $f[$i]->toInt64()->mulInt(121666, 17);
+        }
+
+        $carry9 = $h[9]->addInt(1 << 24)->shiftRight(25);
+        $h[0] = $h[0]->addInt64($carry9->mulInt(19, 5));
+        $h[9] = $h[9]->subInt64($carry9->shiftLeft(25));
+
+        $carry1 = $h[1]->addInt(1 << 24)->shiftRight(25);
+        $h[2] = $h[2]->addInt64($carry1);
+        $h[1] = $h[1]->subInt64($carry1->shiftLeft(25));
+
+        $carry3 = $h[3]->addInt(1 << 24)->shiftRight(25);
+        $h[4] = $h[4]->addInt64($carry3);
+        $h[3] = $h[3]->subInt64($carry3->shiftLeft(25));
+
+        $carry5 = $h[5]->addInt(1 << 24)->shiftRight(25);
+        $h[6] = $h[6]->addInt64($carry5);
+        $h[5] = $h[5]->subInt64($carry5->shiftLeft(25));
+
+        $carry7 = $h[7]->addInt(1 << 24)->shiftRight(25);
+        $h[8] = $h[8]->addInt64($carry7);
+        $h[7] = $h[7]->subInt64($carry7->shiftLeft(25));
+
+        $carry0 = $h[0]->addInt(1 << 25)->shiftRight(26);
+        $h[1] = $h[1]->addInt64($carry0);
+        $h[0] = $h[0]->subInt64($carry0->shiftLeft(26));
+
+        $carry2 = $h[2]->addInt(1 << 25)->shiftRight(26);
+        $h[3] = $h[3]->addInt64($carry2);
+        $h[2] = $h[2]->subInt64($carry2->shiftLeft(26));
+
+        $carry4 = $h[4]->addInt(1 << 25)->shiftRight(26);
+        $h[5] = $h[5]->addInt64($carry4);
+        $h[4] = $h[4]->subInt64($carry4->shiftLeft(26));
+
+        $carry6 = $h[6]->addInt(1 << 25)->shiftRight(26);
+        $h[7] = $h[7]->addInt64($carry6);
+        $h[6] = $h[6]->subInt64($carry6->shiftLeft(26));
+
+        $carry8 = $h[8]->addInt(1 << 25)->shiftRight(26);
+        $h[9] = $h[9]->addInt64($carry8);
+        $h[8] = $h[8]->subInt64($carry8->shiftLeft(26));
+
+        for ($i = 0; $i < 10; ++$i) {
+            $h[$i] = $h[$i]->toInt32();
+        }
+        /** @var array<int, ParagonIE_Sodium_Core32_Int32> $h2 */
+        $h2 = $h;
+        return ParagonIE_Sodium_Core32_Curve25519_Fe::fromArray($h2);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * Inline comments preceded by # are from libsodium's ref10 code.
+     *
+     * @param string $n
+     * @param string $p
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function crypto_scalarmult_curve25519_ref10($n, $p)
+    {
+        # for (i = 0;i < 32;++i) e[i] = n[i];
+        $e = '' . $n;
+        # e[0] &= 248;
+        $e[0] = self::intToChr(
+            self::chrToInt($e[0]) & 248
+        );
+        # e[31] &= 127;
+        # e[31] |= 64;
+        $e[31] = self::intToChr(
+            (self::chrToInt($e[31]) & 127) | 64
+        );
+        # fe_frombytes(x1,p);
+        $x1 = self::fe_frombytes($p);
+        # fe_1(x2);
+        $x2 = self::fe_1();
+        # fe_0(z2);
+        $z2 = self::fe_0();
+        # fe_copy(x3,x1);
+        $x3 = self::fe_copy($x1);
+        # fe_1(z3);
+        $z3 = self::fe_1();
+
+        # swap = 0;
+        /** @var int $swap */
+        $swap = 0;
+
+        # for (pos = 254;pos >= 0;--pos) {
+        for ($pos = 254; $pos >= 0; --$pos) {
+            # b = e[pos / 8] >> (pos & 7);
+            /** @var int $b */
+            $b = self::chrToInt(
+                    $e[(int) floor($pos / 8)]
+                ) >> ($pos & 7);
+            # b &= 1;
+            $b &= 1;
+
+            # swap ^= b;
+            $swap ^= $b;
+
+            # fe_cswap(x2,x3,swap);
+            self::fe_cswap($x2, $x3, $swap);
+
+            # fe_cswap(z2,z3,swap);
+            self::fe_cswap($z2, $z3, $swap);
+
+            # swap = b;
+            /** @var int $swap */
+            $swap = $b;
+
+            # fe_sub(tmp0,x3,z3);
+            $tmp0 = self::fe_sub($x3, $z3);
+
+            # fe_sub(tmp1,x2,z2);
+            $tmp1 = self::fe_sub($x2, $z2);
+
+            # fe_add(x2,x2,z2);
+            $x2 = self::fe_add($x2, $z2);
+
+            # fe_add(z2,x3,z3);
+            $z2 = self::fe_add($x3, $z3);
+
+            # fe_mul(z3,tmp0,x2);
+            $z3 = self::fe_mul($tmp0, $x2);
+
+            # fe_mul(z2,z2,tmp1);
+            $z2 = self::fe_mul($z2, $tmp1);
+
+            # fe_sq(tmp0,tmp1);
+            $tmp0 = self::fe_sq($tmp1);
+
+            # fe_sq(tmp1,x2);
+            $tmp1 = self::fe_sq($x2);
+
+            # fe_add(x3,z3,z2);
+            $x3 = self::fe_add($z3, $z2);
+
+            # fe_sub(z2,z3,z2);
+            $z2 = self::fe_sub($z3, $z2);
+
+            # fe_mul(x2,tmp1,tmp0);
+            $x2 = self::fe_mul($tmp1, $tmp0);
+
+            # fe_sub(tmp1,tmp1,tmp0);
+            $tmp1 = self::fe_sub($tmp1, $tmp0);
+
+            # fe_sq(z2,z2);
+            $z2 = self::fe_sq($z2);
+
+            # fe_mul121666(z3,tmp1);
+            $z3 = self::fe_mul121666($tmp1);
+
+            # fe_sq(x3,x3);
+            $x3 = self::fe_sq($x3);
+
+            # fe_add(tmp0,tmp0,z3);
+            $tmp0 = self::fe_add($tmp0, $z3);
+
+            # fe_mul(z3,x1,z2);
+            $z3 = self::fe_mul($x1, $z2);
+
+            # fe_mul(z2,tmp1,tmp0);
+            $z2 = self::fe_mul($tmp1, $tmp0);
+        }
+
+        # fe_cswap(x2,x3,swap);
+        self::fe_cswap($x2, $x3, $swap);
+
+        # fe_cswap(z2,z3,swap);
+        self::fe_cswap($z2, $z3, $swap);
+
+        # fe_invert(z2,z2);
+        $z2 = self::fe_invert($z2);
+
+        # fe_mul(x2,x2,z2);
+        $x2 = self::fe_mul($x2, $z2);
+        # fe_tobytes(q,x2);
+        return (string) self::fe_tobytes($x2);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe $edwardsY
+     * @param ParagonIE_Sodium_Core32_Curve25519_Fe $edwardsZ
+     * @return ParagonIE_Sodium_Core32_Curve25519_Fe
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function edwards_to_montgomery(
+        ParagonIE_Sodium_Core32_Curve25519_Fe $edwardsY,
+        ParagonIE_Sodium_Core32_Curve25519_Fe $edwardsZ
+    ) {
+        $tempX = self::fe_add($edwardsZ, $edwardsY);
+        $tempZ = self::fe_sub($edwardsZ, $edwardsY);
+        $tempZ = self::fe_invert($tempZ);
+        return self::fe_mul($tempX, $tempZ);
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $n
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function crypto_scalarmult_curve25519_ref10_base($n)
+    {
+        # for (i = 0;i < 32;++i) e[i] = n[i];
+        $e = '' . $n;
+
+        # e[0] &= 248;
+        $e[0] = self::intToChr(
+            self::chrToInt($e[0]) & 248
+        );
+
+        # e[31] &= 127;
+        # e[31] |= 64;
+        $e[31] = self::intToChr(
+            (self::chrToInt($e[31]) & 127) | 64
+        );
+
+        $A = self::ge_scalarmult_base($e);
+        if (
+            !($A->Y instanceof ParagonIE_Sodium_Core32_Curve25519_Fe)
+                ||
+            !($A->Z instanceof ParagonIE_Sodium_Core32_Curve25519_Fe)
+        ) {
+            throw new TypeError('Null points encountered');
+        }
+        $pk = self::edwards_to_montgomery($A->Y, $A->Z);
+        return self::fe_tobytes($pk);
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core32/XChaCha20.php b/vendor/paragonie/sodium_compat/src/Core32/XChaCha20.php
new file mode 100644
index 0000000..1dfc859
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core32/XChaCha20.php
@@ -0,0 +1,64 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core32_XChaCha20', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core32_XChaCha20
+ */
+class ParagonIE_Sodium_Core32_XChaCha20 extends ParagonIE_Sodium_Core32_HChaCha20
+{
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param int $len
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function stream($len = 64, $nonce = '', $key = '')
+    {
+        if (self::strlen($nonce) !== 24) {
+            throw new SodiumException('Nonce must be 24 bytes long');
+        }
+        return self::encryptBytes(
+            new ParagonIE_Sodium_Core32_ChaCha20_Ctx(
+                self::hChaCha20(
+                    self::substr($nonce, 0, 16),
+                    $key
+                ),
+                self::substr($nonce, 16, 8)
+            ),
+            str_repeat("\x00", $len)
+        );
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $message
+     * @param string $nonce
+     * @param string $key
+     * @param string $ic
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function streamXorIc($message, $nonce = '', $key = '', $ic = '')
+    {
+        if (self::strlen($nonce) !== 24) {
+            throw new SodiumException('Nonce must be 24 bytes long');
+        }
+        return self::encryptBytes(
+            new ParagonIE_Sodium_Core32_ChaCha20_Ctx(
+                self::hChaCha20(self::substr($nonce, 0, 16), $key),
+                self::substr($nonce, 16, 8),
+                $ic
+            ),
+            $message
+        );
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Core32/XSalsa20.php b/vendor/paragonie/sodium_compat/src/Core32/XSalsa20.php
new file mode 100644
index 0000000..a16b93b
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Core32/XSalsa20.php
@@ -0,0 +1,57 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core32_XSalsa20', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core32_XSalsa20
+ */
+abstract class ParagonIE_Sodium_Core32_XSalsa20 extends ParagonIE_Sodium_Core32_HSalsa20
+{
+    /**
+     * Expand a key and nonce into an xsalsa20 keystream.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param int $len
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function xsalsa20($len, $nonce, $key)
+    {
+        $ret = self::salsa20(
+            $len,
+            self::substr($nonce, 16, 8),
+            self::hsalsa20($nonce, $key)
+        );
+        return $ret;
+    }
+
+    /**
+     * Encrypt a string with XSalsa20. Doesn't provide integrity.
+     *
+     * @internal You should not use this directly from another application
+     *
+     * @param string $message
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function xsalsa20_xor($message, $nonce, $key)
+    {
+        return self::xorStrings(
+            $message,
+            self::xsalsa20(
+                self::strlen($message),
+                $nonce,
+                $key
+            )
+        );
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Crypto.php b/vendor/paragonie/sodium_compat/src/Crypto.php
new file mode 100644
index 0000000..7e980f4
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Crypto.php
@@ -0,0 +1,1655 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Crypto', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Crypto
+ *
+ * ATTENTION!
+ *
+ * If you are using this library, you should be using
+ * ParagonIE_Sodium_Compat in your code, not this class.
+ */
+abstract class ParagonIE_Sodium_Crypto
+{
+    const aead_chacha20poly1305_KEYBYTES = 32;
+    const aead_chacha20poly1305_NSECBYTES = 0;
+    const aead_chacha20poly1305_NPUBBYTES = 8;
+    const aead_chacha20poly1305_ABYTES = 16;
+
+    const aead_chacha20poly1305_IETF_KEYBYTES = 32;
+    const aead_chacha20poly1305_IETF_NSECBYTES = 0;
+    const aead_chacha20poly1305_IETF_NPUBBYTES = 12;
+    const aead_chacha20poly1305_IETF_ABYTES = 16;
+
+    const aead_xchacha20poly1305_IETF_KEYBYTES = 32;
+    const aead_xchacha20poly1305_IETF_NSECBYTES = 0;
+    const aead_xchacha20poly1305_IETF_NPUBBYTES = 24;
+    const aead_xchacha20poly1305_IETF_ABYTES = 16;
+
+    const box_curve25519xsalsa20poly1305_SEEDBYTES = 32;
+    const box_curve25519xsalsa20poly1305_PUBLICKEYBYTES = 32;
+    const box_curve25519xsalsa20poly1305_SECRETKEYBYTES = 32;
+    const box_curve25519xsalsa20poly1305_BEFORENMBYTES = 32;
+    const box_curve25519xsalsa20poly1305_NONCEBYTES = 24;
+    const box_curve25519xsalsa20poly1305_MACBYTES = 16;
+    const box_curve25519xsalsa20poly1305_BOXZEROBYTES = 16;
+    const box_curve25519xsalsa20poly1305_ZEROBYTES = 32;
+
+    const onetimeauth_poly1305_BYTES = 16;
+    const onetimeauth_poly1305_KEYBYTES = 32;
+
+    const secretbox_xsalsa20poly1305_KEYBYTES = 32;
+    const secretbox_xsalsa20poly1305_NONCEBYTES = 24;
+    const secretbox_xsalsa20poly1305_MACBYTES = 16;
+    const secretbox_xsalsa20poly1305_BOXZEROBYTES = 16;
+    const secretbox_xsalsa20poly1305_ZEROBYTES = 32;
+
+    const secretbox_xchacha20poly1305_KEYBYTES = 32;
+    const secretbox_xchacha20poly1305_NONCEBYTES = 24;
+    const secretbox_xchacha20poly1305_MACBYTES = 16;
+    const secretbox_xchacha20poly1305_BOXZEROBYTES = 16;
+    const secretbox_xchacha20poly1305_ZEROBYTES = 32;
+
+    const stream_salsa20_KEYBYTES = 32;
+
+    /**
+     * AEAD Decryption with ChaCha20-Poly1305
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $message
+     * @param string $ad
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function aead_chacha20poly1305_decrypt(
+        $message = '',
+        $ad = '',
+        $nonce = '',
+        $key = ''
+    ) {
+        /** @var int $len - Length of message (ciphertext + MAC) */
+        $len = ParagonIE_Sodium_Core_Util::strlen($message);
+
+        /** @var int  $clen - Length of ciphertext */
+        $clen = $len - self::aead_chacha20poly1305_ABYTES;
+
+        /** @var int $adlen - Length of associated data */
+        $adlen = ParagonIE_Sodium_Core_Util::strlen($ad);
+
+        /** @var string $mac - Message authentication code */
+        $mac = ParagonIE_Sodium_Core_Util::substr(
+            $message,
+            $clen,
+            self::aead_chacha20poly1305_ABYTES
+        );
+
+        /** @var string $ciphertext - The encrypted message (sans MAC) */
+        $ciphertext = ParagonIE_Sodium_Core_Util::substr($message, 0, $clen);
+
+        /** @var string The first block of the chacha20 keystream, used as a poly1305 key */
+        $block0 = ParagonIE_Sodium_Core_ChaCha20::stream(
+            32,
+            $nonce,
+            $key
+        );
+
+        /* Recalculate the Poly1305 authentication tag (MAC): */
+        $state = new ParagonIE_Sodium_Core_Poly1305_State($block0);
+        try {
+            ParagonIE_Sodium_Compat::memzero($block0);
+        } catch (SodiumException $ex) {
+            $block0 = null;
+        }
+        $state->update($ad);
+        $state->update(ParagonIE_Sodium_Core_Util::store64_le($adlen));
+        $state->update($ciphertext);
+        $state->update(ParagonIE_Sodium_Core_Util::store64_le($clen));
+        $computed_mac = $state->finish();
+
+        /* Compare the given MAC with the recalculated MAC: */
+        if (!ParagonIE_Sodium_Core_Util::verify_16($computed_mac, $mac)) {
+            throw new SodiumException('Invalid MAC');
+        }
+
+        // Here, we know that the MAC is valid, so we decrypt and return the plaintext
+        return ParagonIE_Sodium_Core_ChaCha20::streamXorIc(
+            $ciphertext,
+            $nonce,
+            $key,
+            ParagonIE_Sodium_Core_Util::store64_le(1)
+        );
+    }
+
+    /**
+     * AEAD Encryption with ChaCha20-Poly1305
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $message
+     * @param string $ad
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function aead_chacha20poly1305_encrypt(
+        $message = '',
+        $ad = '',
+        $nonce = '',
+        $key = ''
+    ) {
+        /** @var int $len - Length of the plaintext message */
+        $len = ParagonIE_Sodium_Core_Util::strlen($message);
+
+        /** @var int $adlen - Length of the associated data */
+        $adlen = ParagonIE_Sodium_Core_Util::strlen($ad);
+
+        /** @var string The first block of the chacha20 keystream, used as a poly1305 key */
+        $block0 = ParagonIE_Sodium_Core_ChaCha20::stream(
+            32,
+            $nonce,
+            $key
+        );
+        $state = new ParagonIE_Sodium_Core_Poly1305_State($block0);
+        try {
+            ParagonIE_Sodium_Compat::memzero($block0);
+        } catch (SodiumException $ex) {
+            $block0 = null;
+        }
+
+        /** @var string $ciphertext - Raw encrypted data */
+        $ciphertext = ParagonIE_Sodium_Core_ChaCha20::streamXorIc(
+            $message,
+            $nonce,
+            $key,
+            ParagonIE_Sodium_Core_Util::store64_le(1)
+        );
+
+        $state->update($ad);
+        $state->update(ParagonIE_Sodium_Core_Util::store64_le($adlen));
+        $state->update($ciphertext);
+        $state->update(ParagonIE_Sodium_Core_Util::store64_le($len));
+        return $ciphertext . $state->finish();
+    }
+
+    /**
+     * AEAD Decryption with ChaCha20-Poly1305, IETF mode (96-bit nonce)
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $message
+     * @param string $ad
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function aead_chacha20poly1305_ietf_decrypt(
+        $message = '',
+        $ad = '',
+        $nonce = '',
+        $key = ''
+    ) {
+        /** @var int $adlen - Length of associated data */
+        $adlen = ParagonIE_Sodium_Core_Util::strlen($ad);
+
+        /** @var int $len - Length of message (ciphertext + MAC) */
+        $len = ParagonIE_Sodium_Core_Util::strlen($message);
+
+        /** @var int  $clen - Length of ciphertext */
+        $clen = $len - self::aead_chacha20poly1305_IETF_ABYTES;
+
+        /** @var string The first block of the chacha20 keystream, used as a poly1305 key */
+        $block0 = ParagonIE_Sodium_Core_ChaCha20::ietfStream(
+            32,
+            $nonce,
+            $key
+        );
+
+        /** @var string $mac - Message authentication code */
+        $mac = ParagonIE_Sodium_Core_Util::substr(
+            $message,
+            $len - self::aead_chacha20poly1305_IETF_ABYTES,
+            self::aead_chacha20poly1305_IETF_ABYTES
+        );
+
+        /** @var string $ciphertext - The encrypted message (sans MAC) */
+        $ciphertext = ParagonIE_Sodium_Core_Util::substr(
+            $message,
+            0,
+            $len - self::aead_chacha20poly1305_IETF_ABYTES
+        );
+
+        /* Recalculate the Poly1305 authentication tag (MAC): */
+        $state = new ParagonIE_Sodium_Core_Poly1305_State($block0);
+        try {
+            ParagonIE_Sodium_Compat::memzero($block0);
+        } catch (SodiumException $ex) {
+            $block0 = null;
+        }
+        $state->update($ad);
+        $state->update(str_repeat("\x00", ((0x10 - $adlen) & 0xf)));
+        $state->update($ciphertext);
+        $state->update(str_repeat("\x00", (0x10 - $clen) & 0xf));
+        $state->update(ParagonIE_Sodium_Core_Util::store64_le($adlen));
+        $state->update(ParagonIE_Sodium_Core_Util::store64_le($clen));
+        $computed_mac = $state->finish();
+
+        /* Compare the given MAC with the recalculated MAC: */
+        if (!ParagonIE_Sodium_Core_Util::verify_16($computed_mac, $mac)) {
+            throw new SodiumException('Invalid MAC');
+        }
+
+        // Here, we know that the MAC is valid, so we decrypt and return the plaintext
+        return ParagonIE_Sodium_Core_ChaCha20::ietfStreamXorIc(
+            $ciphertext,
+            $nonce,
+            $key,
+            ParagonIE_Sodium_Core_Util::store64_le(1)
+        );
+    }
+
+    /**
+     * AEAD Encryption with ChaCha20-Poly1305, IETF mode (96-bit nonce)
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $message
+     * @param string $ad
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function aead_chacha20poly1305_ietf_encrypt(
+        $message = '',
+        $ad = '',
+        $nonce = '',
+        $key = ''
+    ) {
+        /** @var int $len - Length of the plaintext message */
+        $len = ParagonIE_Sodium_Core_Util::strlen($message);
+
+        /** @var int $adlen - Length of the associated data */
+        $adlen = ParagonIE_Sodium_Core_Util::strlen($ad);
+
+        /** @var string The first block of the chacha20 keystream, used as a poly1305 key */
+        $block0 = ParagonIE_Sodium_Core_ChaCha20::ietfStream(
+            32,
+            $nonce,
+            $key
+        );
+        $state = new ParagonIE_Sodium_Core_Poly1305_State($block0);
+        try {
+            ParagonIE_Sodium_Compat::memzero($block0);
+        } catch (SodiumException $ex) {
+            $block0 = null;
+        }
+
+        /** @var string $ciphertext - Raw encrypted data */
+        $ciphertext = ParagonIE_Sodium_Core_ChaCha20::ietfStreamXorIc(
+            $message,
+            $nonce,
+            $key,
+            ParagonIE_Sodium_Core_Util::store64_le(1)
+        );
+
+        $state->update($ad);
+        $state->update(str_repeat("\x00", ((0x10 - $adlen) & 0xf)));
+        $state->update($ciphertext);
+        $state->update(str_repeat("\x00", ((0x10 - $len) & 0xf)));
+        $state->update(ParagonIE_Sodium_Core_Util::store64_le($adlen));
+        $state->update(ParagonIE_Sodium_Core_Util::store64_le($len));
+        return $ciphertext . $state->finish();
+    }
+
+    /**
+     * AEAD Decryption with ChaCha20-Poly1305, IETF mode (96-bit nonce)
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $message
+     * @param string $ad
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function aead_xchacha20poly1305_ietf_decrypt(
+        $message = '',
+        $ad = '',
+        $nonce = '',
+        $key = ''
+    ) {
+        $subkey = ParagonIE_Sodium_Core_HChaCha20::hChaCha20(
+            ParagonIE_Sodium_Core_Util::substr($nonce, 0, 16),
+            $key
+        );
+        $nonceLast = "\x00\x00\x00\x00" .
+            ParagonIE_Sodium_Core_Util::substr($nonce, 16, 8);
+
+        return self::aead_chacha20poly1305_ietf_decrypt($message, $ad, $nonceLast, $subkey);
+    }
+
+    /**
+     * AEAD Encryption with ChaCha20-Poly1305, IETF mode (96-bit nonce)
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $message
+     * @param string $ad
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function aead_xchacha20poly1305_ietf_encrypt(
+        $message = '',
+        $ad = '',
+        $nonce = '',
+        $key = ''
+    ) {
+        $subkey = ParagonIE_Sodium_Core_HChaCha20::hChaCha20(
+            ParagonIE_Sodium_Core_Util::substr($nonce, 0, 16),
+            $key
+        );
+        $nonceLast = "\x00\x00\x00\x00" .
+            ParagonIE_Sodium_Core_Util::substr($nonce, 16, 8);
+
+        return self::aead_chacha20poly1305_ietf_encrypt($message, $ad, $nonceLast, $subkey);
+    }
+
+    /**
+     * HMAC-SHA-512-256 (a.k.a. the leftmost 256 bits of HMAC-SHA-512)
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $message
+     * @param string $key
+     * @return string
+     * @throws TypeError
+     */
+    public static function auth($message, $key)
+    {
+        return ParagonIE_Sodium_Core_Util::substr(
+            hash_hmac('sha512', $message, $key, true),
+            0,
+            32
+        );
+    }
+
+    /**
+     * HMAC-SHA-512-256 validation. Constant-time via hash_equals().
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $mac
+     * @param string $message
+     * @param string $key
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function auth_verify($mac, $message, $key)
+    {
+        return ParagonIE_Sodium_Core_Util::hashEquals(
+            $mac,
+            self::auth($message, $key)
+        );
+    }
+
+    /**
+     * X25519 key exchange followed by XSalsa20Poly1305 symmetric encryption
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $plaintext
+     * @param string $nonce
+     * @param string $keypair
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function box($plaintext, $nonce, $keypair)
+    {
+        $c = self::secretbox(
+            $plaintext,
+            $nonce,
+            self::box_beforenm(
+                self::box_secretkey($keypair),
+                self::box_publickey($keypair)
+            )
+        );
+        return $c;
+    }
+
+    /**
+     * X25519-XSalsa20-Poly1305 with one ephemeral X25519 keypair.
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $message
+     * @param string $publicKey
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function box_seal($message, $publicKey)
+    {
+        /** @var string $ephemeralKeypair */
+        $ephemeralKeypair = self::box_keypair();
+
+        /** @var string $ephemeralSK */
+        $ephemeralSK = self::box_secretkey($ephemeralKeypair);
+
+        /** @var string $ephemeralPK */
+        $ephemeralPK = self::box_publickey($ephemeralKeypair);
+
+        /** @var string $nonce */
+        $nonce = self::generichash(
+            $ephemeralPK . $publicKey,
+            '',
+            24
+        );
+
+        /** @var string $keypair - The combined keypair used in crypto_box() */
+        $keypair = self::box_keypair_from_secretkey_and_publickey($ephemeralSK, $publicKey);
+
+        /** @var string $ciphertext Ciphertext + MAC from crypto_box */
+        $ciphertext = self::box($message, $nonce, $keypair);
+        try {
+            ParagonIE_Sodium_Compat::memzero($ephemeralKeypair);
+            ParagonIE_Sodium_Compat::memzero($ephemeralSK);
+            ParagonIE_Sodium_Compat::memzero($nonce);
+        } catch (SodiumException $ex) {
+            $ephemeralKeypair = null;
+            $ephemeralSK = null;
+            $nonce = null;
+        }
+        return $ephemeralPK . $ciphertext;
+    }
+
+    /**
+     * Opens a message encrypted via box_seal().
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $message
+     * @param string $keypair
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function box_seal_open($message, $keypair)
+    {
+        /** @var string $ephemeralPK */
+        $ephemeralPK = ParagonIE_Sodium_Core_Util::substr($message, 0, 32);
+
+        /** @var string $ciphertext (ciphertext + MAC) */
+        $ciphertext = ParagonIE_Sodium_Core_Util::substr($message, 32);
+
+        /** @var string $secretKey */
+        $secretKey = self::box_secretkey($keypair);
+
+        /** @var string $publicKey */
+        $publicKey = self::box_publickey($keypair);
+
+        /** @var string $nonce */
+        $nonce = self::generichash(
+            $ephemeralPK . $publicKey,
+            '',
+            24
+        );
+
+        /** @var string $keypair */
+        $keypair = self::box_keypair_from_secretkey_and_publickey($secretKey, $ephemeralPK);
+
+        /** @var string $m */
+        $m = self::box_open($ciphertext, $nonce, $keypair);
+        try {
+            ParagonIE_Sodium_Compat::memzero($secretKey);
+            ParagonIE_Sodium_Compat::memzero($ephemeralPK);
+            ParagonIE_Sodium_Compat::memzero($nonce);
+        } catch (SodiumException $ex) {
+            $secretKey = null;
+            $ephemeralPK = null;
+            $nonce = null;
+        }
+        return $m;
+    }
+
+    /**
+     * Used by crypto_box() to get the crypto_secretbox() key.
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $sk
+     * @param string $pk
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function box_beforenm($sk, $pk)
+    {
+        return ParagonIE_Sodium_Core_HSalsa20::hsalsa20(
+            str_repeat("\x00", 16),
+            self::scalarmult($sk, $pk)
+        );
+    }
+
+    /**
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @return string
+     * @throws Exception
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function box_keypair()
+    {
+        $sKey = random_bytes(32);
+        $pKey = self::scalarmult_base($sKey);
+        return $sKey . $pKey;
+    }
+
+    /**
+     * @param string $seed
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function box_seed_keypair($seed)
+    {
+        $sKey = ParagonIE_Sodium_Core_Util::substr(
+            hash('sha512', $seed, true),
+            0,
+            32
+        );
+        $pKey = self::scalarmult_base($sKey);
+        return $sKey . $pKey;
+    }
+
+    /**
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $sKey
+     * @param string $pKey
+     * @return string
+     * @throws TypeError
+     */
+    public static function box_keypair_from_secretkey_and_publickey($sKey, $pKey)
+    {
+        return ParagonIE_Sodium_Core_Util::substr($sKey, 0, 32) .
+            ParagonIE_Sodium_Core_Util::substr($pKey, 0, 32);
+    }
+
+    /**
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $keypair
+     * @return string
+     * @throws RangeException
+     * @throws TypeError
+     */
+    public static function box_secretkey($keypair)
+    {
+        if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== 64) {
+            throw new RangeException(
+                'Must be ParagonIE_Sodium_Compat::CRYPTO_BOX_KEYPAIRBYTES bytes long.'
+            );
+        }
+        return ParagonIE_Sodium_Core_Util::substr($keypair, 0, 32);
+    }
+
+    /**
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $keypair
+     * @return string
+     * @throws RangeException
+     * @throws TypeError
+     */
+    public static function box_publickey($keypair)
+    {
+        if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== ParagonIE_Sodium_Compat::CRYPTO_BOX_KEYPAIRBYTES) {
+            throw new RangeException(
+                'Must be ParagonIE_Sodium_Compat::CRYPTO_BOX_KEYPAIRBYTES bytes long.'
+            );
+        }
+        return ParagonIE_Sodium_Core_Util::substr($keypair, 32, 32);
+    }
+
+    /**
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $sKey
+     * @return string
+     * @throws RangeException
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function box_publickey_from_secretkey($sKey)
+    {
+        if (ParagonIE_Sodium_Core_Util::strlen($sKey) !== ParagonIE_Sodium_Compat::CRYPTO_BOX_SECRETKEYBYTES) {
+            throw new RangeException(
+                'Must be ParagonIE_Sodium_Compat::CRYPTO_BOX_SECRETKEYBYTES bytes long.'
+            );
+        }
+        return self::scalarmult_base($sKey);
+    }
+
+    /**
+     * Decrypt a message encrypted with box().
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $ciphertext
+     * @param string $nonce
+     * @param string $keypair
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function box_open($ciphertext, $nonce, $keypair)
+    {
+        return self::secretbox_open(
+            $ciphertext,
+            $nonce,
+            self::box_beforenm(
+                self::box_secretkey($keypair),
+                self::box_publickey($keypair)
+            )
+        );
+    }
+
+    /**
+     * Calculate a BLAKE2b hash.
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $message
+     * @param string|null $key
+     * @param int $outlen
+     * @return string
+     * @throws RangeException
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function generichash($message, $key = '', $outlen = 32)
+    {
+        // This ensures that ParagonIE_Sodium_Core_BLAKE2b::$iv is initialized
+        ParagonIE_Sodium_Core_BLAKE2b::pseudoConstructor();
+
+        $k = null;
+        if (!empty($key)) {
+            /** @var SplFixedArray $k */
+            $k = ParagonIE_Sodium_Core_BLAKE2b::stringToSplFixedArray($key);
+            if ($k->count() > ParagonIE_Sodium_Core_BLAKE2b::KEYBYTES) {
+                throw new RangeException('Invalid key size');
+            }
+        }
+
+        /** @var SplFixedArray $in */
+        $in = ParagonIE_Sodium_Core_BLAKE2b::stringToSplFixedArray($message);
+
+        /** @var SplFixedArray $ctx */
+        $ctx = ParagonIE_Sodium_Core_BLAKE2b::init($k, $outlen);
+        ParagonIE_Sodium_Core_BLAKE2b::update($ctx, $in, $in->count());
+
+        /** @var SplFixedArray $out */
+        $out = new SplFixedArray($outlen);
+        $out = ParagonIE_Sodium_Core_BLAKE2b::finish($ctx, $out);
+
+        /** @var array<int, int> */
+        $outArray = $out->toArray();
+        return ParagonIE_Sodium_Core_Util::intArrayToString($outArray);
+    }
+
+    /**
+     * Finalize a BLAKE2b hashing context, returning the hash.
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $ctx
+     * @param int $outlen
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function generichash_final($ctx, $outlen = 32)
+    {
+        if (!is_string($ctx)) {
+            throw new TypeError('Context must be a string');
+        }
+        $out = new SplFixedArray($outlen);
+
+        /** @var SplFixedArray $context */
+        $context = ParagonIE_Sodium_Core_BLAKE2b::stringToContext($ctx);
+
+        /** @var SplFixedArray $out */
+        $out = ParagonIE_Sodium_Core_BLAKE2b::finish($context, $out);
+
+        /** @var array<int, int> */
+        $outArray = $out->toArray();
+        return ParagonIE_Sodium_Core_Util::intArrayToString($outArray);
+    }
+
+    /**
+     * Initialize a hashing context for BLAKE2b.
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $key
+     * @param int $outputLength
+     * @return string
+     * @throws RangeException
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function generichash_init($key = '', $outputLength = 32)
+    {
+        // This ensures that ParagonIE_Sodium_Core_BLAKE2b::$iv is initialized
+        ParagonIE_Sodium_Core_BLAKE2b::pseudoConstructor();
+
+        $k = null;
+        if (!empty($key)) {
+            $k = ParagonIE_Sodium_Core_BLAKE2b::stringToSplFixedArray($key);
+            if ($k->count() > ParagonIE_Sodium_Core_BLAKE2b::KEYBYTES) {
+                throw new RangeException('Invalid key size');
+            }
+        }
+
+        /** @var SplFixedArray $ctx */
+        $ctx = ParagonIE_Sodium_Core_BLAKE2b::init($k, $outputLength);
+
+        return ParagonIE_Sodium_Core_BLAKE2b::contextToString($ctx);
+    }
+
+    /**
+     * Initialize a hashing context for BLAKE2b.
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $key
+     * @param int $outputLength
+     * @param string $salt
+     * @param string $personal
+     * @return string
+     * @throws RangeException
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function generichash_init_salt_personal(
+        $key = '',
+        $outputLength = 32,
+        $salt = '',
+        $personal = ''
+    ) {
+        // This ensures that ParagonIE_Sodium_Core_BLAKE2b::$iv is initialized
+        ParagonIE_Sodium_Core_BLAKE2b::pseudoConstructor();
+
+        $k = null;
+        if (!empty($key)) {
+            $k = ParagonIE_Sodium_Core_BLAKE2b::stringToSplFixedArray($key);
+            if ($k->count() > ParagonIE_Sodium_Core_BLAKE2b::KEYBYTES) {
+                throw new RangeException('Invalid key size');
+            }
+        }
+        if (!empty($salt)) {
+            $s = ParagonIE_Sodium_Core_BLAKE2b::stringToSplFixedArray($salt);
+        } else {
+            $s = null;
+        }
+        if (!empty($salt)) {
+            $p = ParagonIE_Sodium_Core_BLAKE2b::stringToSplFixedArray($personal);
+        } else {
+            $p = null;
+        }
+
+        /** @var SplFixedArray $ctx */
+        $ctx = ParagonIE_Sodium_Core_BLAKE2b::init($k, $outputLength, $s, $p);
+
+        return ParagonIE_Sodium_Core_BLAKE2b::contextToString($ctx);
+    }
+
+    /**
+     * Update a hashing context for BLAKE2b with $message
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $ctx
+     * @param string $message
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function generichash_update($ctx, $message)
+    {
+        // This ensures that ParagonIE_Sodium_Core_BLAKE2b::$iv is initialized
+        ParagonIE_Sodium_Core_BLAKE2b::pseudoConstructor();
+
+        /** @var SplFixedArray $context */
+        $context = ParagonIE_Sodium_Core_BLAKE2b::stringToContext($ctx);
+
+        /** @var SplFixedArray $in */
+        $in = ParagonIE_Sodium_Core_BLAKE2b::stringToSplFixedArray($message);
+
+        ParagonIE_Sodium_Core_BLAKE2b::update($context, $in, $in->count());
+
+        return ParagonIE_Sodium_Core_BLAKE2b::contextToString($context);
+    }
+
+    /**
+     * Libsodium's crypto_kx().
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $my_sk
+     * @param string $their_pk
+     * @param string $client_pk
+     * @param string $server_pk
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function keyExchange($my_sk, $their_pk, $client_pk, $server_pk)
+    {
+        return ParagonIE_Sodium_Compat::crypto_generichash(
+            ParagonIE_Sodium_Compat::crypto_scalarmult($my_sk, $their_pk) .
+            $client_pk .
+            $server_pk
+        );
+    }
+
+    /**
+     * ECDH over Curve25519
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $sKey
+     * @param string $pKey
+     * @return string
+     *
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function scalarmult($sKey, $pKey)
+    {
+        $q = ParagonIE_Sodium_Core_X25519::crypto_scalarmult_curve25519_ref10($sKey, $pKey);
+        self::scalarmult_throw_if_zero($q);
+        return $q;
+    }
+
+    /**
+     * ECDH over Curve25519, using the basepoint.
+     * Used to get a secret key from a public key.
+     *
+     * @param string $secret
+     * @return string
+     *
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function scalarmult_base($secret)
+    {
+        $q = ParagonIE_Sodium_Core_X25519::crypto_scalarmult_curve25519_ref10_base($secret);
+        self::scalarmult_throw_if_zero($q);
+        return $q;
+    }
+
+    /**
+     * This throws an Error if a zero public key was passed to the function.
+     *
+     * @param string $q
+     * @return void
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    protected static function scalarmult_throw_if_zero($q)
+    {
+        $d = 0;
+        for ($i = 0; $i < self::box_curve25519xsalsa20poly1305_SECRETKEYBYTES; ++$i) {
+            $d |= ParagonIE_Sodium_Core_Util::chrToInt($q[$i]);
+        }
+
+        /* branch-free variant of === 0 */
+        if (-(1 & (($d - 1) >> 8))) {
+            throw new SodiumException('Zero public key is not allowed');
+        }
+    }
+
+    /**
+     * XSalsa20-Poly1305 authenticated symmetric-key encryption.
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $plaintext
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function secretbox($plaintext, $nonce, $key)
+    {
+        /** @var string $subkey */
+        $subkey = ParagonIE_Sodium_Core_HSalsa20::hsalsa20($nonce, $key);
+
+        /** @var string $block0 */
+        $block0 = str_repeat("\x00", 32);
+
+        /** @var int $mlen - Length of the plaintext message */
+        $mlen = ParagonIE_Sodium_Core_Util::strlen($plaintext);
+        $mlen0 = $mlen;
+        if ($mlen0 > 64 - self::secretbox_xsalsa20poly1305_ZEROBYTES) {
+            $mlen0 = 64 - self::secretbox_xsalsa20poly1305_ZEROBYTES;
+        }
+        $block0 .= ParagonIE_Sodium_Core_Util::substr($plaintext, 0, $mlen0);
+
+        /** @var string $block0 */
+        $block0 = ParagonIE_Sodium_Core_Salsa20::salsa20_xor(
+            $block0,
+            ParagonIE_Sodium_Core_Util::substr($nonce, 16, 8),
+            $subkey
+        );
+
+        /** @var string $c */
+        $c = ParagonIE_Sodium_Core_Util::substr(
+            $block0,
+            self::secretbox_xsalsa20poly1305_ZEROBYTES
+        );
+        if ($mlen > $mlen0) {
+            $c .= ParagonIE_Sodium_Core_Salsa20::salsa20_xor_ic(
+                ParagonIE_Sodium_Core_Util::substr(
+                    $plaintext,
+                    self::secretbox_xsalsa20poly1305_ZEROBYTES
+                ),
+                ParagonIE_Sodium_Core_Util::substr($nonce, 16, 8),
+                1,
+                $subkey
+            );
+        }
+        $state = new ParagonIE_Sodium_Core_Poly1305_State(
+            ParagonIE_Sodium_Core_Util::substr(
+                $block0,
+                0,
+                self::onetimeauth_poly1305_KEYBYTES
+            )
+        );
+        try {
+            ParagonIE_Sodium_Compat::memzero($block0);
+            ParagonIE_Sodium_Compat::memzero($subkey);
+        } catch (SodiumException $ex) {
+            $block0 = null;
+            $subkey = null;
+        }
+
+        $state->update($c);
+
+        /** @var string $c - MAC || ciphertext */
+        $c = $state->finish() . $c;
+        unset($state);
+
+        return $c;
+    }
+
+    /**
+     * Decrypt a ciphertext generated via secretbox().
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $ciphertext
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function secretbox_open($ciphertext, $nonce, $key)
+    {
+        /** @var string $mac */
+        $mac = ParagonIE_Sodium_Core_Util::substr(
+            $ciphertext,
+            0,
+            self::secretbox_xsalsa20poly1305_MACBYTES
+        );
+
+        /** @var string $c */
+        $c = ParagonIE_Sodium_Core_Util::substr(
+            $ciphertext,
+            self::secretbox_xsalsa20poly1305_MACBYTES
+        );
+
+        /** @var int $clen */
+        $clen = ParagonIE_Sodium_Core_Util::strlen($c);
+
+        /** @var string $subkey */
+        $subkey = ParagonIE_Sodium_Core_HSalsa20::hsalsa20($nonce, $key);
+
+        /** @var string $block0 */
+        $block0 = ParagonIE_Sodium_Core_Salsa20::salsa20(
+            64,
+            ParagonIE_Sodium_Core_Util::substr($nonce, 16, 8),
+            $subkey
+        );
+        $verified = ParagonIE_Sodium_Core_Poly1305::onetimeauth_verify(
+            $mac,
+            $c,
+            ParagonIE_Sodium_Core_Util::substr($block0, 0, 32)
+        );
+        if (!$verified) {
+            try {
+                ParagonIE_Sodium_Compat::memzero($subkey);
+            } catch (SodiumException $ex) {
+                $subkey = null;
+            }
+            throw new SodiumException('Invalid MAC');
+        }
+
+        /** @var string $m - Decrypted message */
+        $m = ParagonIE_Sodium_Core_Util::xorStrings(
+            ParagonIE_Sodium_Core_Util::substr($block0, self::secretbox_xsalsa20poly1305_ZEROBYTES),
+            ParagonIE_Sodium_Core_Util::substr($c, 0, self::secretbox_xsalsa20poly1305_ZEROBYTES)
+        );
+        if ($clen > self::secretbox_xsalsa20poly1305_ZEROBYTES) {
+            // We had more than 1 block, so let's continue to decrypt the rest.
+            $m .= ParagonIE_Sodium_Core_Salsa20::salsa20_xor_ic(
+                ParagonIE_Sodium_Core_Util::substr(
+                    $c,
+                    self::secretbox_xsalsa20poly1305_ZEROBYTES
+                ),
+                ParagonIE_Sodium_Core_Util::substr($nonce, 16, 8),
+                1,
+                (string) $subkey
+            );
+        }
+        return $m;
+    }
+
+    /**
+     * XChaCha20-Poly1305 authenticated symmetric-key encryption.
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $plaintext
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function secretbox_xchacha20poly1305($plaintext, $nonce, $key)
+    {
+        /** @var string $subkey */
+        $subkey = ParagonIE_Sodium_Core_HChaCha20::hChaCha20(
+            ParagonIE_Sodium_Core_Util::substr($nonce, 0, 16),
+            $key
+        );
+        $nonceLast = ParagonIE_Sodium_Core_Util::substr($nonce, 16, 8);
+
+        /** @var string $block0 */
+        $block0 = str_repeat("\x00", 32);
+
+        /** @var int $mlen - Length of the plaintext message */
+        $mlen = ParagonIE_Sodium_Core_Util::strlen($plaintext);
+        $mlen0 = $mlen;
+        if ($mlen0 > 64 - self::secretbox_xchacha20poly1305_ZEROBYTES) {
+            $mlen0 = 64 - self::secretbox_xchacha20poly1305_ZEROBYTES;
+        }
+        $block0 .= ParagonIE_Sodium_Core_Util::substr($plaintext, 0, $mlen0);
+
+        /** @var string $block0 */
+        $block0 = ParagonIE_Sodium_Core_ChaCha20::streamXorIc(
+            $block0,
+            $nonceLast,
+            $subkey
+        );
+
+        /** @var string $c */
+        $c = ParagonIE_Sodium_Core_Util::substr(
+            $block0,
+            self::secretbox_xchacha20poly1305_ZEROBYTES
+        );
+        if ($mlen > $mlen0) {
+            $c .= ParagonIE_Sodium_Core_ChaCha20::streamXorIc(
+                ParagonIE_Sodium_Core_Util::substr(
+                    $plaintext,
+                    self::secretbox_xchacha20poly1305_ZEROBYTES
+                ),
+                $nonceLast,
+                $subkey,
+                ParagonIE_Sodium_Core_Util::store64_le(1)
+            );
+        }
+        $state = new ParagonIE_Sodium_Core_Poly1305_State(
+            ParagonIE_Sodium_Core_Util::substr(
+                $block0,
+                0,
+                self::onetimeauth_poly1305_KEYBYTES
+            )
+        );
+        try {
+            ParagonIE_Sodium_Compat::memzero($block0);
+            ParagonIE_Sodium_Compat::memzero($subkey);
+        } catch (SodiumException $ex) {
+            $block0 = null;
+            $subkey = null;
+        }
+
+        $state->update($c);
+
+        /** @var string $c - MAC || ciphertext */
+        $c = $state->finish() . $c;
+        unset($state);
+
+        return $c;
+    }
+
+    /**
+     * Decrypt a ciphertext generated via secretbox_xchacha20poly1305().
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $ciphertext
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function secretbox_xchacha20poly1305_open($ciphertext, $nonce, $key)
+    {
+        /** @var string $mac */
+        $mac = ParagonIE_Sodium_Core_Util::substr(
+            $ciphertext,
+            0,
+            self::secretbox_xchacha20poly1305_MACBYTES
+        );
+
+        /** @var string $c */
+        $c = ParagonIE_Sodium_Core_Util::substr(
+            $ciphertext,
+            self::secretbox_xchacha20poly1305_MACBYTES
+        );
+
+        /** @var int $clen */
+        $clen = ParagonIE_Sodium_Core_Util::strlen($c);
+
+        /** @var string $subkey */
+        $subkey = ParagonIE_Sodium_Core_HChaCha20::hchacha20($nonce, $key);
+
+        /** @var string $block0 */
+        $block0 = ParagonIE_Sodium_Core_ChaCha20::stream(
+            64,
+            ParagonIE_Sodium_Core_Util::substr($nonce, 16, 8),
+            $subkey
+        );
+        $verified = ParagonIE_Sodium_Core_Poly1305::onetimeauth_verify(
+            $mac,
+            $c,
+            ParagonIE_Sodium_Core_Util::substr($block0, 0, 32)
+        );
+
+        if (!$verified) {
+            try {
+                ParagonIE_Sodium_Compat::memzero($subkey);
+            } catch (SodiumException $ex) {
+                $subkey = null;
+            }
+            throw new SodiumException('Invalid MAC');
+        }
+
+        /** @var string $m - Decrypted message */
+        $m = ParagonIE_Sodium_Core_Util::xorStrings(
+            ParagonIE_Sodium_Core_Util::substr($block0, self::secretbox_xchacha20poly1305_ZEROBYTES),
+            ParagonIE_Sodium_Core_Util::substr($c, 0, self::secretbox_xchacha20poly1305_ZEROBYTES)
+        );
+
+        if ($clen > self::secretbox_xchacha20poly1305_ZEROBYTES) {
+            // We had more than 1 block, so let's continue to decrypt the rest.
+            $m .= ParagonIE_Sodium_Core_ChaCha20::streamXorIc(
+                ParagonIE_Sodium_Core_Util::substr(
+                    $c,
+                    self::secretbox_xchacha20poly1305_ZEROBYTES
+                ),
+                ParagonIE_Sodium_Core_Util::substr($nonce, 16, 8),
+                (string) $subkey,
+                ParagonIE_Sodium_Core_Util::store64_le(1)
+            );
+        }
+        return $m;
+    }
+
+    /**
+     * @param string $key
+     * @return array<int, string> Returns a state and a header.
+     * @throws Exception
+     * @throws SodiumException
+     */
+    public static function secretstream_xchacha20poly1305_init_push($key)
+    {
+        # randombytes_buf(out, crypto_secretstream_xchacha20poly1305_HEADERBYTES);
+        $out = random_bytes(24);
+
+        # crypto_core_hchacha20(state->k, out, k, NULL);
+        $subkey = ParagonIE_Sodium_Core_HChaCha20::hChaCha20($out, $key);
+        $state = new ParagonIE_Sodium_Core_SecretStream_State(
+            $subkey,
+            ParagonIE_Sodium_Core_Util::substr($out, 16, 8) . str_repeat("\0", 4)
+        );
+
+        # _crypto_secretstream_xchacha20poly1305_counter_reset(state);
+        $state->counterReset();
+
+        # memcpy(STATE_INONCE(state), out + crypto_core_hchacha20_INPUTBYTES,
+        #        crypto_secretstream_xchacha20poly1305_INONCEBYTES);
+        # memset(state->_pad, 0, sizeof state->_pad);
+        return array(
+            $state->toString(),
+            $out
+        );
+    }
+
+    /**
+     * @param string $key
+     * @param string $header
+     * @return string Returns a state.
+     * @throws Exception
+     */
+    public static function secretstream_xchacha20poly1305_init_pull($key, $header)
+    {
+        # crypto_core_hchacha20(state->k, in, k, NULL);
+        $subkey = ParagonIE_Sodium_Core_HChaCha20::hChaCha20(
+            ParagonIE_Sodium_Core_Util::substr($header, 0, 16),
+            $key
+        );
+        $state = new ParagonIE_Sodium_Core_SecretStream_State(
+            $subkey,
+            ParagonIE_Sodium_Core_Util::substr($header, 16)
+        );
+        $state->counterReset();
+        # memcpy(STATE_INONCE(state), in + crypto_core_hchacha20_INPUTBYTES,
+        #     crypto_secretstream_xchacha20poly1305_INONCEBYTES);
+        # memset(state->_pad, 0, sizeof state->_pad);
+        # return 0;
+        return $state->toString();
+    }
+
+    /**
+     * @param string $state
+     * @param string $msg
+     * @param string $aad
+     * @param int $tag
+     * @return string
+     * @throws SodiumException
+     */
+    public static function secretstream_xchacha20poly1305_push(&$state, $msg, $aad = '', $tag = 0)
+    {
+        $st = ParagonIE_Sodium_Core_SecretStream_State::fromString($state);
+        # crypto_onetimeauth_poly1305_state poly1305_state;
+        # unsigned char                     block[64U];
+        # unsigned char                     slen[8U];
+        # unsigned char                    *c;
+        # unsigned char                    *mac;
+
+        $msglen = ParagonIE_Sodium_Core_Util::strlen($msg);
+        $aadlen = ParagonIE_Sodium_Core_Util::strlen($aad);
+
+        if ((($msglen + 63) >> 6) > 0xfffffffe) {
+            throw new SodiumException(
+                'message cannot be larger than SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_MESSAGEBYTES_MAX bytes'
+            );
+        }
+
+        # if (outlen_p != NULL) {
+        #     *outlen_p = 0U;
+        # }
+        # if (mlen > crypto_secretstream_xchacha20poly1305_MESSAGEBYTES_MAX) {
+        #     sodium_misuse();
+        # }
+
+        # crypto_stream_chacha20_ietf(block, sizeof block, state->nonce, state->k);
+        # crypto_onetimeauth_poly1305_init(&poly1305_state, block);
+        # sodium_memzero(block, sizeof block);
+        $auth = new ParagonIE_Sodium_Core_Poly1305_State(
+            ParagonIE_Sodium_Core_ChaCha20::ietfStream(32, $st->getCombinedNonce(), $st->getKey())
+        );
+
+        # crypto_onetimeauth_poly1305_update(&poly1305_state, ad, adlen);
+        $auth->update($aad);
+
+        # crypto_onetimeauth_poly1305_update(&poly1305_state, _pad0,
+        #     (0x10 - adlen) & 0xf);
+        $auth->update(str_repeat("\0", ((0x10 - $aadlen) & 0xf)));
+
+        # memset(block, 0, sizeof block);
+        # block[0] = tag;
+        # crypto_stream_chacha20_ietf_xor_ic(block, block, sizeof block,
+        #                                    state->nonce, 1U, state->k);
+        $block = ParagonIE_Sodium_Core_ChaCha20::ietfStreamXorIc(
+            ParagonIE_Sodium_Core_Util::intToChr($tag) . str_repeat("\0", 63),
+            $st->getCombinedNonce(),
+            $st->getKey(),
+            ParagonIE_Sodium_Core_Util::store64_le(1)
+        );
+
+        # crypto_onetimeauth_poly1305_update(&poly1305_state, block, sizeof block);
+        $auth->update($block);
+
+        # out[0] = block[0];
+        $out = $block[0];
+        # c = out + (sizeof tag);
+        # crypto_stream_chacha20_ietf_xor_ic(c, m, mlen, state->nonce, 2U, state->k);
+        $cipher = ParagonIE_Sodium_Core_ChaCha20::ietfStreamXorIc(
+            $msg,
+            $st->getCombinedNonce(),
+            $st->getKey(),
+            ParagonIE_Sodium_Core_Util::store64_le(2)
+        );
+
+        # crypto_onetimeauth_poly1305_update(&poly1305_state, c, mlen);
+        $auth->update($cipher);
+
+        $out .= $cipher;
+        unset($cipher);
+
+        # crypto_onetimeauth_poly1305_update
+        # (&poly1305_state, _pad0, (0x10 - (sizeof block) + mlen) & 0xf);
+        $auth->update(str_repeat("\0", ((0x10 - 64 + $msglen) & 0xf)));
+
+        # STORE64_LE(slen, (uint64_t) adlen);
+        $slen = ParagonIE_Sodium_Core_Util::store64_le($aadlen);
+
+        # crypto_onetimeauth_poly1305_update(&poly1305_state, slen, sizeof slen);
+        $auth->update($slen);
+
+        # STORE64_LE(slen, (sizeof block) + mlen);
+        $slen = ParagonIE_Sodium_Core_Util::store64_le(64 + $msglen);
+
+        # crypto_onetimeauth_poly1305_update(&poly1305_state, slen, sizeof slen);
+        $auth->update($slen);
+
+        # mac = c + mlen;
+        # crypto_onetimeauth_poly1305_final(&poly1305_state, mac);
+        $mac = $auth->finish();
+        $out .= $mac;
+
+        # sodium_memzero(&poly1305_state, sizeof poly1305_state);
+        unset($auth);
+
+
+        # XOR_BUF(STATE_INONCE(state), mac,
+        #     crypto_secretstream_xchacha20poly1305_INONCEBYTES);
+        $st->xorNonce($mac);
+
+        # sodium_increment(STATE_COUNTER(state),
+        #     crypto_secretstream_xchacha20poly1305_COUNTERBYTES);
+        $st->incrementCounter();
+        // Overwrite by reference:
+        $state = $st->toString();
+
+        /** @var bool $rekey */
+        $rekey = ($tag & ParagonIE_Sodium_Compat::CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_TAG_REKEY) !== 0;
+        # if ((tag & crypto_secretstream_xchacha20poly1305_TAG_REKEY) != 0 ||
+        #     sodium_is_zero(STATE_COUNTER(state),
+        #         crypto_secretstream_xchacha20poly1305_COUNTERBYTES)) {
+        #     crypto_secretstream_xchacha20poly1305_rekey(state);
+        # }
+        if ($rekey || $st->needsRekey()) {
+            // DO REKEY
+            self::secretstream_xchacha20poly1305_rekey($state);
+        }
+        # if (outlen_p != NULL) {
+        #     *outlen_p = crypto_secretstream_xchacha20poly1305_ABYTES + mlen;
+        # }
+        return $out;
+    }
+
+    /**
+     * @param string $state
+     * @param string $cipher
+     * @param string $aad
+     * @return bool|array{0: string, 1: int}
+     * @throws SodiumException
+     */
+    public static function secretstream_xchacha20poly1305_pull(&$state, $cipher, $aad = '')
+    {
+        $st = ParagonIE_Sodium_Core_SecretStream_State::fromString($state);
+
+        $cipherlen = ParagonIE_Sodium_Core_Util::strlen($cipher);
+        #     mlen = inlen - crypto_secretstream_xchacha20poly1305_ABYTES;
+        $msglen = $cipherlen - ParagonIE_Sodium_Compat::CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_ABYTES;
+        $aadlen = ParagonIE_Sodium_Core_Util::strlen($aad);
+
+        #     if (mlen > crypto_secretstream_xchacha20poly1305_MESSAGEBYTES_MAX) {
+        #         sodium_misuse();
+        #     }
+        if ((($msglen + 63) >> 6) > 0xfffffffe) {
+            throw new SodiumException(
+                'message cannot be larger than SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_MESSAGEBYTES_MAX bytes'
+            );
+        }
+
+        #     crypto_stream_chacha20_ietf(block, sizeof block, state->nonce, state->k);
+        #     crypto_onetimeauth_poly1305_init(&poly1305_state, block);
+        #     sodium_memzero(block, sizeof block);
+        $auth = new ParagonIE_Sodium_Core_Poly1305_State(
+            ParagonIE_Sodium_Core_ChaCha20::ietfStream(32, $st->getCombinedNonce(), $st->getKey())
+        );
+
+        #     crypto_onetimeauth_poly1305_update(&poly1305_state, ad, adlen);
+        $auth->update($aad);
+
+        #     crypto_onetimeauth_poly1305_update(&poly1305_state, _pad0,
+        #         (0x10 - adlen) & 0xf);
+        $auth->update(str_repeat("\0", ((0x10 - $aadlen) & 0xf)));
+
+
+        #     memset(block, 0, sizeof block);
+        #     block[0] = in[0];
+        #     crypto_stream_chacha20_ietf_xor_ic(block, block, sizeof block,
+        #                                        state->nonce, 1U, state->k);
+        $block = ParagonIE_Sodium_Core_ChaCha20::ietfStreamXorIc(
+            $cipher[0] . str_repeat("\0", 63),
+            $st->getCombinedNonce(),
+            $st->getKey(),
+            ParagonIE_Sodium_Core_Util::store64_le(1)
+        );
+        #     tag = block[0];
+        #     block[0] = in[0];
+        #     crypto_onetimeauth_poly1305_update(&poly1305_state, block, sizeof block);
+        $tag = ParagonIE_Sodium_Core_Util::chrToInt($block[0]);
+        $block[0] = $cipher[0];
+        $auth->update($block);
+
+
+        #     c = in + (sizeof tag);
+        #     crypto_onetimeauth_poly1305_update(&poly1305_state, c, mlen);
+        $auth->update(ParagonIE_Sodium_Core_Util::substr($cipher, 1, $msglen));
+
+        #     crypto_onetimeauth_poly1305_update
+        #     (&poly1305_state, _pad0, (0x10 - (sizeof block) + mlen) & 0xf);
+        $auth->update(str_repeat("\0", ((0x10 - 64 + $msglen) & 0xf)));
+
+        #     STORE64_LE(slen, (uint64_t) adlen);
+        #     crypto_onetimeauth_poly1305_update(&poly1305_state, slen, sizeof slen);
+        $slen = ParagonIE_Sodium_Core_Util::store64_le($aadlen);
+        $auth->update($slen);
+
+        #     STORE64_LE(slen, (sizeof block) + mlen);
+        #     crypto_onetimeauth_poly1305_update(&poly1305_state, slen, sizeof slen);
+        $slen = ParagonIE_Sodium_Core_Util::store64_le(64 + $msglen);
+        $auth->update($slen);
+
+        #     crypto_onetimeauth_poly1305_final(&poly1305_state, mac);
+        #     sodium_memzero(&poly1305_state, sizeof poly1305_state);
+        $mac = $auth->finish();
+
+        #     stored_mac = c + mlen;
+        #     if (sodium_memcmp(mac, stored_mac, sizeof mac) != 0) {
+        #     sodium_memzero(mac, sizeof mac);
+        #         return -1;
+        #     }
+
+        $stored = ParagonIE_Sodium_Core_Util::substr($cipher, $msglen + 1, 16);
+        if (!ParagonIE_Sodium_Core_Util::hashEquals($mac, $stored)) {
+            return false;
+        }
+
+        #     crypto_stream_chacha20_ietf_xor_ic(m, c, mlen, state->nonce, 2U, state->k);
+        $out = ParagonIE_Sodium_Core_ChaCha20::ietfStreamXorIc(
+            ParagonIE_Sodium_Core_Util::substr($cipher, 1, $msglen),
+            $st->getCombinedNonce(),
+            $st->getKey(),
+            ParagonIE_Sodium_Core_Util::store64_le(2)
+        );
+
+        #     XOR_BUF(STATE_INONCE(state), mac,
+        #         crypto_secretstream_xchacha20poly1305_INONCEBYTES);
+        $st->xorNonce($mac);
+
+        #     sodium_increment(STATE_COUNTER(state),
+        #         crypto_secretstream_xchacha20poly1305_COUNTERBYTES);
+        $st->incrementCounter();
+
+        #     if ((tag & crypto_secretstream_xchacha20poly1305_TAG_REKEY) != 0 ||
+        #         sodium_is_zero(STATE_COUNTER(state),
+        #             crypto_secretstream_xchacha20poly1305_COUNTERBYTES)) {
+        #         crypto_secretstream_xchacha20poly1305_rekey(state);
+        #     }
+
+        // Overwrite by reference:
+        $state = $st->toString();
+
+        /** @var bool $rekey */
+        $rekey = ($tag & ParagonIE_Sodium_Compat::CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_TAG_REKEY) !== 0;
+        if ($rekey || $st->needsRekey()) {
+            // DO REKEY
+            self::secretstream_xchacha20poly1305_rekey($state);
+        }
+        return array($out, $tag);
+    }
+
+    /**
+     * @param string $state
+     * @return void
+     * @throws SodiumException
+     */
+    public static function secretstream_xchacha20poly1305_rekey(&$state)
+    {
+        $st = ParagonIE_Sodium_Core_SecretStream_State::fromString($state);
+        # unsigned char new_key_and_inonce[crypto_stream_chacha20_ietf_KEYBYTES +
+        # crypto_secretstream_xchacha20poly1305_INONCEBYTES];
+        # size_t        i;
+        # for (i = 0U; i < crypto_stream_chacha20_ietf_KEYBYTES; i++) {
+        #     new_key_and_inonce[i] = state->k[i];
+        # }
+        $new_key_and_inonce = $st->getKey();
+
+        # for (i = 0U; i < crypto_secretstream_xchacha20poly1305_INONCEBYTES; i++) {
+        #     new_key_and_inonce[crypto_stream_chacha20_ietf_KEYBYTES + i] =
+        #         STATE_INONCE(state)[i];
+        # }
+        $new_key_and_inonce .= ParagonIE_Sodium_Core_Util::substR($st->getNonce(), 0, 8);
+
+        # crypto_stream_chacha20_ietf_xor(new_key_and_inonce, new_key_and_inonce,
+        #                                 sizeof new_key_and_inonce,
+        #                                 state->nonce, state->k);
+
+        $st->rekey(ParagonIE_Sodium_Core_ChaCha20::ietfStreamXorIc(
+            $new_key_and_inonce,
+            $st->getCombinedNonce(),
+            $st->getKey(),
+            ParagonIE_Sodium_Core_Util::store64_le(0)
+        ));
+
+        # for (i = 0U; i < crypto_stream_chacha20_ietf_KEYBYTES; i++) {
+        #     state->k[i] = new_key_and_inonce[i];
+        # }
+        # for (i = 0U; i < crypto_secretstream_xchacha20poly1305_INONCEBYTES; i++) {
+        #     STATE_INONCE(state)[i] =
+        #          new_key_and_inonce[crypto_stream_chacha20_ietf_KEYBYTES + i];
+        # }
+        # _crypto_secretstream_xchacha20poly1305_counter_reset(state);
+        $st->counterReset();
+
+        $state = $st->toString();
+    }
+
+    /**
+     * Detached Ed25519 signature.
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $message
+     * @param string $sk
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function sign_detached($message, $sk)
+    {
+        return ParagonIE_Sodium_Core_Ed25519::sign_detached($message, $sk);
+    }
+
+    /**
+     * Attached Ed25519 signature. (Returns a signed message.)
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $message
+     * @param string $sk
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function sign($message, $sk)
+    {
+        return ParagonIE_Sodium_Core_Ed25519::sign($message, $sk);
+    }
+
+    /**
+     * Opens a signed message. If valid, returns the message.
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $signedMessage
+     * @param string $pk
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function sign_open($signedMessage, $pk)
+    {
+        return ParagonIE_Sodium_Core_Ed25519::sign_open($signedMessage, $pk);
+    }
+
+    /**
+     * Verify a detached signature of a given message and public key.
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $signature
+     * @param string $message
+     * @param string $pk
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function sign_verify_detached($signature, $message, $pk)
+    {
+        return ParagonIE_Sodium_Core_Ed25519::verify_detached($signature, $message, $pk);
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/Crypto32.php b/vendor/paragonie/sodium_compat/src/Crypto32.php
new file mode 100644
index 0000000..34c0d7a
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/Crypto32.php
@@ -0,0 +1,1654 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Crypto32', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Crypto
+ *
+ * ATTENTION!
+ *
+ * If you are using this library, you should be using
+ * ParagonIE_Sodium_Compat in your code, not this class.
+ */
+abstract class ParagonIE_Sodium_Crypto32
+{
+    const aead_chacha20poly1305_KEYBYTES = 32;
+    const aead_chacha20poly1305_NSECBYTES = 0;
+    const aead_chacha20poly1305_NPUBBYTES = 8;
+    const aead_chacha20poly1305_ABYTES = 16;
+
+    const aead_chacha20poly1305_IETF_KEYBYTES = 32;
+    const aead_chacha20poly1305_IETF_NSECBYTES = 0;
+    const aead_chacha20poly1305_IETF_NPUBBYTES = 12;
+    const aead_chacha20poly1305_IETF_ABYTES = 16;
+
+    const aead_xchacha20poly1305_IETF_KEYBYTES = 32;
+    const aead_xchacha20poly1305_IETF_NSECBYTES = 0;
+    const aead_xchacha20poly1305_IETF_NPUBBYTES = 24;
+    const aead_xchacha20poly1305_IETF_ABYTES = 16;
+
+    const box_curve25519xsalsa20poly1305_SEEDBYTES = 32;
+    const box_curve25519xsalsa20poly1305_PUBLICKEYBYTES = 32;
+    const box_curve25519xsalsa20poly1305_SECRETKEYBYTES = 32;
+    const box_curve25519xsalsa20poly1305_BEFORENMBYTES = 32;
+    const box_curve25519xsalsa20poly1305_NONCEBYTES = 24;
+    const box_curve25519xsalsa20poly1305_MACBYTES = 16;
+    const box_curve25519xsalsa20poly1305_BOXZEROBYTES = 16;
+    const box_curve25519xsalsa20poly1305_ZEROBYTES = 32;
+
+    const onetimeauth_poly1305_BYTES = 16;
+    const onetimeauth_poly1305_KEYBYTES = 32;
+
+    const secretbox_xsalsa20poly1305_KEYBYTES = 32;
+    const secretbox_xsalsa20poly1305_NONCEBYTES = 24;
+    const secretbox_xsalsa20poly1305_MACBYTES = 16;
+    const secretbox_xsalsa20poly1305_BOXZEROBYTES = 16;
+    const secretbox_xsalsa20poly1305_ZEROBYTES = 32;
+
+    const secretbox_xchacha20poly1305_KEYBYTES = 32;
+    const secretbox_xchacha20poly1305_NONCEBYTES = 24;
+    const secretbox_xchacha20poly1305_MACBYTES = 16;
+    const secretbox_xchacha20poly1305_BOXZEROBYTES = 16;
+    const secretbox_xchacha20poly1305_ZEROBYTES = 32;
+
+    const stream_salsa20_KEYBYTES = 32;
+
+    /**
+     * AEAD Decryption with ChaCha20-Poly1305
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $message
+     * @param string $ad
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function aead_chacha20poly1305_decrypt(
+        $message = '',
+        $ad = '',
+        $nonce = '',
+        $key = ''
+    ) {
+        /** @var int $len - Length of message (ciphertext + MAC) */
+        $len = ParagonIE_Sodium_Core32_Util::strlen($message);
+
+        /** @var int  $clen - Length of ciphertext */
+        $clen = $len - self::aead_chacha20poly1305_ABYTES;
+
+        /** @var int $adlen - Length of associated data */
+        $adlen = ParagonIE_Sodium_Core32_Util::strlen($ad);
+
+        /** @var string $mac - Message authentication code */
+        $mac = ParagonIE_Sodium_Core32_Util::substr(
+            $message,
+            $clen,
+            self::aead_chacha20poly1305_ABYTES
+        );
+
+        /** @var string $ciphertext - The encrypted message (sans MAC) */
+        $ciphertext = ParagonIE_Sodium_Core32_Util::substr($message, 0, $clen);
+
+        /** @var string The first block of the chacha20 keystream, used as a poly1305 key */
+        $block0 = ParagonIE_Sodium_Core32_ChaCha20::stream(
+            32,
+            $nonce,
+            $key
+        );
+
+        /* Recalculate the Poly1305 authentication tag (MAC): */
+        $state = new ParagonIE_Sodium_Core32_Poly1305_State($block0);
+        try {
+            ParagonIE_Sodium_Compat::memzero($block0);
+        } catch (SodiumException $ex) {
+            $block0 = null;
+        }
+        $state->update($ad);
+        $state->update(ParagonIE_Sodium_Core32_Util::store64_le($adlen));
+        $state->update($ciphertext);
+        $state->update(ParagonIE_Sodium_Core32_Util::store64_le($clen));
+        $computed_mac = $state->finish();
+
+        /* Compare the given MAC with the recalculated MAC: */
+        if (!ParagonIE_Sodium_Core32_Util::verify_16($computed_mac, $mac)) {
+            throw new SodiumException('Invalid MAC');
+        }
+
+        // Here, we know that the MAC is valid, so we decrypt and return the plaintext
+        return ParagonIE_Sodium_Core32_ChaCha20::streamXorIc(
+            $ciphertext,
+            $nonce,
+            $key,
+            ParagonIE_Sodium_Core32_Util::store64_le(1)
+        );
+    }
+
+    /**
+     * AEAD Encryption with ChaCha20-Poly1305
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $message
+     * @param string $ad
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function aead_chacha20poly1305_encrypt(
+        $message = '',
+        $ad = '',
+        $nonce = '',
+        $key = ''
+    ) {
+        /** @var int $len - Length of the plaintext message */
+        $len = ParagonIE_Sodium_Core32_Util::strlen($message);
+
+        /** @var int $adlen - Length of the associated data */
+        $adlen = ParagonIE_Sodium_Core32_Util::strlen($ad);
+
+        /** @var string The first block of the chacha20 keystream, used as a poly1305 key */
+        $block0 = ParagonIE_Sodium_Core32_ChaCha20::stream(
+            32,
+            $nonce,
+            $key
+        );
+        $state = new ParagonIE_Sodium_Core32_Poly1305_State($block0);
+        try {
+            ParagonIE_Sodium_Compat::memzero($block0);
+        } catch (SodiumException $ex) {
+            $block0 = null;
+        }
+
+        /** @var string $ciphertext - Raw encrypted data */
+        $ciphertext = ParagonIE_Sodium_Core32_ChaCha20::streamXorIc(
+            $message,
+            $nonce,
+            $key,
+            ParagonIE_Sodium_Core32_Util::store64_le(1)
+        );
+
+        $state->update($ad);
+        $state->update(ParagonIE_Sodium_Core32_Util::store64_le($adlen));
+        $state->update($ciphertext);
+        $state->update(ParagonIE_Sodium_Core32_Util::store64_le($len));
+        return $ciphertext . $state->finish();
+    }
+
+    /**
+     * AEAD Decryption with ChaCha20-Poly1305, IETF mode (96-bit nonce)
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $message
+     * @param string $ad
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function aead_chacha20poly1305_ietf_decrypt(
+        $message = '',
+        $ad = '',
+        $nonce = '',
+        $key = ''
+    ) {
+        /** @var int $adlen - Length of associated data */
+        $adlen = ParagonIE_Sodium_Core32_Util::strlen($ad);
+
+        /** @var int $len - Length of message (ciphertext + MAC) */
+        $len = ParagonIE_Sodium_Core32_Util::strlen($message);
+
+        /** @var int  $clen - Length of ciphertext */
+        $clen = $len - self::aead_chacha20poly1305_IETF_ABYTES;
+
+        /** @var string The first block of the chacha20 keystream, used as a poly1305 key */
+        $block0 = ParagonIE_Sodium_Core32_ChaCha20::ietfStream(
+            32,
+            $nonce,
+            $key
+        );
+
+        /** @var string $mac - Message authentication code */
+        $mac = ParagonIE_Sodium_Core32_Util::substr(
+            $message,
+            $len - self::aead_chacha20poly1305_IETF_ABYTES,
+            self::aead_chacha20poly1305_IETF_ABYTES
+        );
+
+        /** @var string $ciphertext - The encrypted message (sans MAC) */
+        $ciphertext = ParagonIE_Sodium_Core32_Util::substr(
+            $message,
+            0,
+            $len - self::aead_chacha20poly1305_IETF_ABYTES
+        );
+
+        /* Recalculate the Poly1305 authentication tag (MAC): */
+        $state = new ParagonIE_Sodium_Core32_Poly1305_State($block0);
+        try {
+            ParagonIE_Sodium_Compat::memzero($block0);
+        } catch (SodiumException $ex) {
+            $block0 = null;
+        }
+        $state->update($ad);
+        $state->update(str_repeat("\x00", ((0x10 - $adlen) & 0xf)));
+        $state->update($ciphertext);
+        $state->update(str_repeat("\x00", (0x10 - $clen) & 0xf));
+        $state->update(ParagonIE_Sodium_Core32_Util::store64_le($adlen));
+        $state->update(ParagonIE_Sodium_Core32_Util::store64_le($clen));
+        $computed_mac = $state->finish();
+
+        /* Compare the given MAC with the recalculated MAC: */
+        if (!ParagonIE_Sodium_Core32_Util::verify_16($computed_mac, $mac)) {
+            throw new SodiumException('Invalid MAC');
+        }
+
+        // Here, we know that the MAC is valid, so we decrypt and return the plaintext
+        return ParagonIE_Sodium_Core32_ChaCha20::ietfStreamXorIc(
+            $ciphertext,
+            $nonce,
+            $key,
+            ParagonIE_Sodium_Core32_Util::store64_le(1)
+        );
+    }
+
+    /**
+     * AEAD Encryption with ChaCha20-Poly1305, IETF mode (96-bit nonce)
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $message
+     * @param string $ad
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function aead_chacha20poly1305_ietf_encrypt(
+        $message = '',
+        $ad = '',
+        $nonce = '',
+        $key = ''
+    ) {
+        /** @var int $len - Length of the plaintext message */
+        $len = ParagonIE_Sodium_Core32_Util::strlen($message);
+
+        /** @var int $adlen - Length of the associated data */
+        $adlen = ParagonIE_Sodium_Core32_Util::strlen($ad);
+
+        /** @var string The first block of the chacha20 keystream, used as a poly1305 key */
+        $block0 = ParagonIE_Sodium_Core32_ChaCha20::ietfStream(
+            32,
+            $nonce,
+            $key
+        );
+        $state = new ParagonIE_Sodium_Core32_Poly1305_State($block0);
+        try {
+            ParagonIE_Sodium_Compat::memzero($block0);
+        } catch (SodiumException $ex) {
+            $block0 = null;
+        }
+
+        /** @var string $ciphertext - Raw encrypted data */
+        $ciphertext = ParagonIE_Sodium_Core32_ChaCha20::ietfStreamXorIc(
+            $message,
+            $nonce,
+            $key,
+            ParagonIE_Sodium_Core32_Util::store64_le(1)
+        );
+
+        $state->update($ad);
+        $state->update(str_repeat("\x00", ((0x10 - $adlen) & 0xf)));
+        $state->update($ciphertext);
+        $state->update(str_repeat("\x00", ((0x10 - $len) & 0xf)));
+        $state->update(ParagonIE_Sodium_Core32_Util::store64_le($adlen));
+        $state->update(ParagonIE_Sodium_Core32_Util::store64_le($len));
+        return $ciphertext . $state->finish();
+    }
+
+    /**
+     * AEAD Decryption with ChaCha20-Poly1305, IETF mode (96-bit nonce)
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $message
+     * @param string $ad
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function aead_xchacha20poly1305_ietf_decrypt(
+        $message = '',
+        $ad = '',
+        $nonce = '',
+        $key = ''
+    ) {
+        $subkey = ParagonIE_Sodium_Core32_HChaCha20::hChaCha20(
+            ParagonIE_Sodium_Core32_Util::substr($nonce, 0, 16),
+            $key
+        );
+        $nonceLast = "\x00\x00\x00\x00" .
+            ParagonIE_Sodium_Core32_Util::substr($nonce, 16, 8);
+
+        return self::aead_chacha20poly1305_ietf_decrypt($message, $ad, $nonceLast, $subkey);
+    }
+
+    /**
+     * AEAD Encryption with ChaCha20-Poly1305, IETF mode (96-bit nonce)
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $message
+     * @param string $ad
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function aead_xchacha20poly1305_ietf_encrypt(
+        $message = '',
+        $ad = '',
+        $nonce = '',
+        $key = ''
+    ) {
+        $subkey = ParagonIE_Sodium_Core32_HChaCha20::hChaCha20(
+            ParagonIE_Sodium_Core32_Util::substr($nonce, 0, 16),
+            $key
+        );
+        $nonceLast = "\x00\x00\x00\x00" .
+            ParagonIE_Sodium_Core32_Util::substr($nonce, 16, 8);
+
+        return self::aead_chacha20poly1305_ietf_encrypt($message, $ad, $nonceLast, $subkey);
+    }
+
+    /**
+     * HMAC-SHA-512-256 (a.k.a. the leftmost 256 bits of HMAC-SHA-512)
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $message
+     * @param string $key
+     * @return string
+     * @throws TypeError
+     */
+    public static function auth($message, $key)
+    {
+        return ParagonIE_Sodium_Core32_Util::substr(
+            hash_hmac('sha512', $message, $key, true),
+            0,
+            32
+        );
+    }
+
+    /**
+     * HMAC-SHA-512-256 validation. Constant-time via hash_equals().
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $mac
+     * @param string $message
+     * @param string $key
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function auth_verify($mac, $message, $key)
+    {
+        return ParagonIE_Sodium_Core32_Util::hashEquals(
+            $mac,
+            self::auth($message, $key)
+        );
+    }
+
+    /**
+     * X25519 key exchange followed by XSalsa20Poly1305 symmetric encryption
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $plaintext
+     * @param string $nonce
+     * @param string $keypair
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function box($plaintext, $nonce, $keypair)
+    {
+        return self::secretbox(
+            $plaintext,
+            $nonce,
+            self::box_beforenm(
+                self::box_secretkey($keypair),
+                self::box_publickey($keypair)
+            )
+        );
+    }
+
+    /**
+     * X25519-XSalsa20-Poly1305 with one ephemeral X25519 keypair.
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $message
+     * @param string $publicKey
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function box_seal($message, $publicKey)
+    {
+        /** @var string $ephemeralKeypair */
+        $ephemeralKeypair = self::box_keypair();
+
+        /** @var string $ephemeralSK */
+        $ephemeralSK = self::box_secretkey($ephemeralKeypair);
+
+        /** @var string $ephemeralPK */
+        $ephemeralPK = self::box_publickey($ephemeralKeypair);
+
+        /** @var string $nonce */
+        $nonce = self::generichash(
+            $ephemeralPK . $publicKey,
+            '',
+            24
+        );
+
+        /** @var string $keypair - The combined keypair used in crypto_box() */
+        $keypair = self::box_keypair_from_secretkey_and_publickey($ephemeralSK, $publicKey);
+
+        /** @var string $ciphertext Ciphertext + MAC from crypto_box */
+        $ciphertext = self::box($message, $nonce, $keypair);
+        try {
+            ParagonIE_Sodium_Compat::memzero($ephemeralKeypair);
+            ParagonIE_Sodium_Compat::memzero($ephemeralSK);
+            ParagonIE_Sodium_Compat::memzero($nonce);
+        } catch (SodiumException $ex) {
+            $ephemeralKeypair = null;
+            $ephemeralSK = null;
+            $nonce = null;
+        }
+        return $ephemeralPK . $ciphertext;
+    }
+
+    /**
+     * Opens a message encrypted via box_seal().
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $message
+     * @param string $keypair
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function box_seal_open($message, $keypair)
+    {
+        /** @var string $ephemeralPK */
+        $ephemeralPK = ParagonIE_Sodium_Core32_Util::substr($message, 0, 32);
+
+        /** @var string $ciphertext (ciphertext + MAC) */
+        $ciphertext = ParagonIE_Sodium_Core32_Util::substr($message, 32);
+
+        /** @var string $secretKey */
+        $secretKey = self::box_secretkey($keypair);
+
+        /** @var string $publicKey */
+        $publicKey = self::box_publickey($keypair);
+
+        /** @var string $nonce */
+        $nonce = self::generichash(
+            $ephemeralPK . $publicKey,
+            '',
+            24
+        );
+
+        /** @var string $keypair */
+        $keypair = self::box_keypair_from_secretkey_and_publickey($secretKey, $ephemeralPK);
+
+        /** @var string $m */
+        $m = self::box_open($ciphertext, $nonce, $keypair);
+        try {
+            ParagonIE_Sodium_Compat::memzero($secretKey);
+            ParagonIE_Sodium_Compat::memzero($ephemeralPK);
+            ParagonIE_Sodium_Compat::memzero($nonce);
+        } catch (SodiumException $ex) {
+            $secretKey = null;
+            $ephemeralPK = null;
+            $nonce = null;
+        }
+        return $m;
+    }
+
+    /**
+     * Used by crypto_box() to get the crypto_secretbox() key.
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $sk
+     * @param string $pk
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function box_beforenm($sk, $pk)
+    {
+        return ParagonIE_Sodium_Core32_HSalsa20::hsalsa20(
+            str_repeat("\x00", 16),
+            self::scalarmult($sk, $pk)
+        );
+    }
+
+    /**
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @return string
+     * @throws Exception
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function box_keypair()
+    {
+        $sKey = random_bytes(32);
+        $pKey = self::scalarmult_base($sKey);
+        return $sKey . $pKey;
+    }
+
+    /**
+     * @param string $seed
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function box_seed_keypair($seed)
+    {
+        $sKey = ParagonIE_Sodium_Core32_Util::substr(
+            hash('sha512', $seed, true),
+            0,
+            32
+        );
+        $pKey = self::scalarmult_base($sKey);
+        return $sKey . $pKey;
+    }
+
+    /**
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $sKey
+     * @param string $pKey
+     * @return string
+     * @throws TypeError
+     */
+    public static function box_keypair_from_secretkey_and_publickey($sKey, $pKey)
+    {
+        return ParagonIE_Sodium_Core32_Util::substr($sKey, 0, 32) .
+            ParagonIE_Sodium_Core32_Util::substr($pKey, 0, 32);
+    }
+
+    /**
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $keypair
+     * @return string
+     * @throws RangeException
+     * @throws TypeError
+     */
+    public static function box_secretkey($keypair)
+    {
+        if (ParagonIE_Sodium_Core32_Util::strlen($keypair) !== 64) {
+            throw new RangeException(
+                'Must be ParagonIE_Sodium_Compat::CRYPTO_BOX_KEYPAIRBYTES bytes long.'
+            );
+        }
+        return ParagonIE_Sodium_Core32_Util::substr($keypair, 0, 32);
+    }
+
+    /**
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $keypair
+     * @return string
+     * @throws RangeException
+     * @throws TypeError
+     */
+    public static function box_publickey($keypair)
+    {
+        if (ParagonIE_Sodium_Core32_Util::strlen($keypair) !== ParagonIE_Sodium_Compat::CRYPTO_BOX_KEYPAIRBYTES) {
+            throw new RangeException(
+                'Must be ParagonIE_Sodium_Compat::CRYPTO_BOX_KEYPAIRBYTES bytes long.'
+            );
+        }
+        return ParagonIE_Sodium_Core32_Util::substr($keypair, 32, 32);
+    }
+
+    /**
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $sKey
+     * @return string
+     * @throws RangeException
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function box_publickey_from_secretkey($sKey)
+    {
+        if (ParagonIE_Sodium_Core32_Util::strlen($sKey) !== ParagonIE_Sodium_Compat::CRYPTO_BOX_SECRETKEYBYTES) {
+            throw new RangeException(
+                'Must be ParagonIE_Sodium_Compat::CRYPTO_BOX_SECRETKEYBYTES bytes long.'
+            );
+        }
+        return self::scalarmult_base($sKey);
+    }
+
+    /**
+     * Decrypt a message encrypted with box().
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $ciphertext
+     * @param string $nonce
+     * @param string $keypair
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function box_open($ciphertext, $nonce, $keypair)
+    {
+        return self::secretbox_open(
+            $ciphertext,
+            $nonce,
+            self::box_beforenm(
+                self::box_secretkey($keypair),
+                self::box_publickey($keypair)
+            )
+        );
+    }
+
+    /**
+     * Calculate a BLAKE2b hash.
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $message
+     * @param string|null $key
+     * @param int $outlen
+     * @return string
+     * @throws RangeException
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function generichash($message, $key = '', $outlen = 32)
+    {
+        // This ensures that ParagonIE_Sodium_Core32_BLAKE2b::$iv is initialized
+        ParagonIE_Sodium_Core32_BLAKE2b::pseudoConstructor();
+
+        $k = null;
+        if (!empty($key)) {
+            /** @var SplFixedArray $k */
+            $k = ParagonIE_Sodium_Core32_BLAKE2b::stringToSplFixedArray($key);
+            if ($k->count() > ParagonIE_Sodium_Core32_BLAKE2b::KEYBYTES) {
+                throw new RangeException('Invalid key size');
+            }
+        }
+
+        /** @var SplFixedArray $in */
+        $in = ParagonIE_Sodium_Core32_BLAKE2b::stringToSplFixedArray($message);
+
+        /** @var SplFixedArray $ctx */
+        $ctx = ParagonIE_Sodium_Core32_BLAKE2b::init($k, $outlen);
+        ParagonIE_Sodium_Core32_BLAKE2b::update($ctx, $in, $in->count());
+
+        /** @var SplFixedArray $out */
+        $out = new SplFixedArray($outlen);
+        $out = ParagonIE_Sodium_Core32_BLAKE2b::finish($ctx, $out);
+
+        /** @var array<int, int> */
+        $outArray = $out->toArray();
+        return ParagonIE_Sodium_Core32_Util::intArrayToString($outArray);
+    }
+
+    /**
+     * Finalize a BLAKE2b hashing context, returning the hash.
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $ctx
+     * @param int $outlen
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function generichash_final($ctx, $outlen = 32)
+    {
+        if (!is_string($ctx)) {
+            throw new TypeError('Context must be a string');
+        }
+        $out = new SplFixedArray($outlen);
+
+        /** @var SplFixedArray $context */
+        $context = ParagonIE_Sodium_Core32_BLAKE2b::stringToContext($ctx);
+
+        /** @var SplFixedArray $out */
+        $out = ParagonIE_Sodium_Core32_BLAKE2b::finish($context, $out);
+
+        /** @var array<int, int> */
+        $outArray = $out->toArray();
+        return ParagonIE_Sodium_Core32_Util::intArrayToString($outArray);
+    }
+
+    /**
+     * Initialize a hashing context for BLAKE2b.
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $key
+     * @param int $outputLength
+     * @return string
+     * @throws RangeException
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function generichash_init($key = '', $outputLength = 32)
+    {
+        // This ensures that ParagonIE_Sodium_Core32_BLAKE2b::$iv is initialized
+        ParagonIE_Sodium_Core32_BLAKE2b::pseudoConstructor();
+
+        $k = null;
+        if (!empty($key)) {
+            $k = ParagonIE_Sodium_Core32_BLAKE2b::stringToSplFixedArray($key);
+            if ($k->count() > ParagonIE_Sodium_Core32_BLAKE2b::KEYBYTES) {
+                throw new RangeException('Invalid key size');
+            }
+        }
+
+        /** @var SplFixedArray $ctx */
+        $ctx = ParagonIE_Sodium_Core32_BLAKE2b::init($k, $outputLength);
+
+        return ParagonIE_Sodium_Core32_BLAKE2b::contextToString($ctx);
+    }
+
+    /**
+     * Initialize a hashing context for BLAKE2b.
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $key
+     * @param int $outputLength
+     * @param string $salt
+     * @param string $personal
+     * @return string
+     * @throws RangeException
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function generichash_init_salt_personal(
+        $key = '',
+        $outputLength = 32,
+        $salt = '',
+        $personal = ''
+    ) {
+        // This ensures that ParagonIE_Sodium_Core32_BLAKE2b::$iv is initialized
+        ParagonIE_Sodium_Core32_BLAKE2b::pseudoConstructor();
+
+        $k = null;
+        if (!empty($key)) {
+            $k = ParagonIE_Sodium_Core32_BLAKE2b::stringToSplFixedArray($key);
+            if ($k->count() > ParagonIE_Sodium_Core32_BLAKE2b::KEYBYTES) {
+                throw new RangeException('Invalid key size');
+            }
+        }
+        if (!empty($salt)) {
+            $s = ParagonIE_Sodium_Core32_BLAKE2b::stringToSplFixedArray($salt);
+        } else {
+            $s = null;
+        }
+        if (!empty($salt)) {
+            $p = ParagonIE_Sodium_Core32_BLAKE2b::stringToSplFixedArray($personal);
+        } else {
+            $p = null;
+        }
+
+        /** @var SplFixedArray $ctx */
+        $ctx = ParagonIE_Sodium_Core32_BLAKE2b::init($k, $outputLength, $s, $p);
+
+        return ParagonIE_Sodium_Core32_BLAKE2b::contextToString($ctx);
+    }
+
+    /**
+     * Update a hashing context for BLAKE2b with $message
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $ctx
+     * @param string $message
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function generichash_update($ctx, $message)
+    {
+        // This ensures that ParagonIE_Sodium_Core32_BLAKE2b::$iv is initialized
+        ParagonIE_Sodium_Core32_BLAKE2b::pseudoConstructor();
+
+        /** @var SplFixedArray $context */
+        $context = ParagonIE_Sodium_Core32_BLAKE2b::stringToContext($ctx);
+
+        /** @var SplFixedArray $in */
+        $in = ParagonIE_Sodium_Core32_BLAKE2b::stringToSplFixedArray($message);
+
+        ParagonIE_Sodium_Core32_BLAKE2b::update($context, $in, $in->count());
+
+        return ParagonIE_Sodium_Core32_BLAKE2b::contextToString($context);
+    }
+
+    /**
+     * Libsodium's crypto_kx().
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $my_sk
+     * @param string $their_pk
+     * @param string $client_pk
+     * @param string $server_pk
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function keyExchange($my_sk, $their_pk, $client_pk, $server_pk)
+    {
+        return self::generichash(
+            self::scalarmult($my_sk, $their_pk) .
+            $client_pk .
+            $server_pk
+        );
+    }
+
+    /**
+     * ECDH over Curve25519
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $sKey
+     * @param string $pKey
+     * @return string
+     *
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function scalarmult($sKey, $pKey)
+    {
+        $q = ParagonIE_Sodium_Core32_X25519::crypto_scalarmult_curve25519_ref10($sKey, $pKey);
+        self::scalarmult_throw_if_zero($q);
+        return $q;
+    }
+
+    /**
+     * ECDH over Curve25519, using the basepoint.
+     * Used to get a secret key from a public key.
+     *
+     * @param string $secret
+     * @return string
+     *
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function scalarmult_base($secret)
+    {
+        $q = ParagonIE_Sodium_Core32_X25519::crypto_scalarmult_curve25519_ref10_base($secret);
+        self::scalarmult_throw_if_zero($q);
+        return $q;
+    }
+
+    /**
+     * This throws an Error if a zero public key was passed to the function.
+     *
+     * @param string $q
+     * @return void
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    protected static function scalarmult_throw_if_zero($q)
+    {
+        $d = 0;
+        for ($i = 0; $i < self::box_curve25519xsalsa20poly1305_SECRETKEYBYTES; ++$i) {
+            $d |= ParagonIE_Sodium_Core32_Util::chrToInt($q[$i]);
+        }
+
+        /* branch-free variant of === 0 */
+        if (-(1 & (($d - 1) >> 8))) {
+            throw new SodiumException('Zero public key is not allowed');
+        }
+    }
+
+    /**
+     * XSalsa20-Poly1305 authenticated symmetric-key encryption.
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $plaintext
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function secretbox($plaintext, $nonce, $key)
+    {
+        /** @var string $subkey */
+        $subkey = ParagonIE_Sodium_Core32_HSalsa20::hsalsa20($nonce, $key);
+
+        /** @var string $block0 */
+        $block0 = str_repeat("\x00", 32);
+
+        /** @var int $mlen - Length of the plaintext message */
+        $mlen = ParagonIE_Sodium_Core32_Util::strlen($plaintext);
+        $mlen0 = $mlen;
+        if ($mlen0 > 64 - self::secretbox_xsalsa20poly1305_ZEROBYTES) {
+            $mlen0 = 64 - self::secretbox_xsalsa20poly1305_ZEROBYTES;
+        }
+        $block0 .= ParagonIE_Sodium_Core32_Util::substr($plaintext, 0, $mlen0);
+
+        /** @var string $block0 */
+        $block0 = ParagonIE_Sodium_Core32_Salsa20::salsa20_xor(
+            $block0,
+            ParagonIE_Sodium_Core32_Util::substr($nonce, 16, 8),
+            $subkey
+        );
+
+        /** @var string $c */
+        $c = ParagonIE_Sodium_Core32_Util::substr(
+            $block0,
+            self::secretbox_xsalsa20poly1305_ZEROBYTES
+        );
+        if ($mlen > $mlen0) {
+            $c .= ParagonIE_Sodium_Core32_Salsa20::salsa20_xor_ic(
+                ParagonIE_Sodium_Core32_Util::substr(
+                    $plaintext,
+                    self::secretbox_xsalsa20poly1305_ZEROBYTES
+                ),
+                ParagonIE_Sodium_Core32_Util::substr($nonce, 16, 8),
+                1,
+                $subkey
+            );
+        }
+        $state = new ParagonIE_Sodium_Core32_Poly1305_State(
+            ParagonIE_Sodium_Core32_Util::substr(
+                $block0,
+                0,
+                self::onetimeauth_poly1305_KEYBYTES
+            )
+        );
+        try {
+            ParagonIE_Sodium_Compat::memzero($block0);
+            ParagonIE_Sodium_Compat::memzero($subkey);
+        } catch (SodiumException $ex) {
+            $block0 = null;
+            $subkey = null;
+        }
+
+        $state->update($c);
+
+        /** @var string $c - MAC || ciphertext */
+        $c = $state->finish() . $c;
+        unset($state);
+
+        return $c;
+    }
+
+    /**
+     * Decrypt a ciphertext generated via secretbox().
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $ciphertext
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function secretbox_open($ciphertext, $nonce, $key)
+    {
+        /** @var string $mac */
+        $mac = ParagonIE_Sodium_Core32_Util::substr(
+            $ciphertext,
+            0,
+            self::secretbox_xsalsa20poly1305_MACBYTES
+        );
+
+        /** @var string $c */
+        $c = ParagonIE_Sodium_Core32_Util::substr(
+            $ciphertext,
+            self::secretbox_xsalsa20poly1305_MACBYTES
+        );
+
+        /** @var int $clen */
+        $clen = ParagonIE_Sodium_Core32_Util::strlen($c);
+
+        /** @var string $subkey */
+        $subkey = ParagonIE_Sodium_Core32_HSalsa20::hsalsa20($nonce, $key);
+
+        /** @var string $block0 */
+        $block0 = ParagonIE_Sodium_Core32_Salsa20::salsa20(
+            64,
+            ParagonIE_Sodium_Core32_Util::substr($nonce, 16, 8),
+            $subkey
+        );
+        $verified = ParagonIE_Sodium_Core32_Poly1305::onetimeauth_verify(
+            $mac,
+            $c,
+            ParagonIE_Sodium_Core32_Util::substr($block0, 0, 32)
+        );
+        if (!$verified) {
+            try {
+                ParagonIE_Sodium_Compat::memzero($subkey);
+            } catch (SodiumException $ex) {
+                $subkey = null;
+            }
+            throw new SodiumException('Invalid MAC');
+        }
+
+        /** @var string $m - Decrypted message */
+        $m = ParagonIE_Sodium_Core32_Util::xorStrings(
+            ParagonIE_Sodium_Core32_Util::substr($block0, self::secretbox_xsalsa20poly1305_ZEROBYTES),
+            ParagonIE_Sodium_Core32_Util::substr($c, 0, self::secretbox_xsalsa20poly1305_ZEROBYTES)
+        );
+        if ($clen > self::secretbox_xsalsa20poly1305_ZEROBYTES) {
+            // We had more than 1 block, so let's continue to decrypt the rest.
+            $m .= ParagonIE_Sodium_Core32_Salsa20::salsa20_xor_ic(
+                ParagonIE_Sodium_Core32_Util::substr(
+                    $c,
+                    self::secretbox_xsalsa20poly1305_ZEROBYTES
+                ),
+                ParagonIE_Sodium_Core32_Util::substr($nonce, 16, 8),
+                1,
+                (string) $subkey
+            );
+        }
+        return $m;
+    }
+
+    /**
+     * XChaCha20-Poly1305 authenticated symmetric-key encryption.
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $plaintext
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function secretbox_xchacha20poly1305($plaintext, $nonce, $key)
+    {
+        /** @var string $subkey */
+        $subkey = ParagonIE_Sodium_Core32_HChaCha20::hChaCha20(
+            ParagonIE_Sodium_Core32_Util::substr($nonce, 0, 16),
+            $key
+        );
+        $nonceLast = ParagonIE_Sodium_Core32_Util::substr($nonce, 16, 8);
+
+        /** @var string $block0 */
+        $block0 = str_repeat("\x00", 32);
+
+        /** @var int $mlen - Length of the plaintext message */
+        $mlen = ParagonIE_Sodium_Core32_Util::strlen($plaintext);
+        $mlen0 = $mlen;
+        if ($mlen0 > 64 - self::secretbox_xchacha20poly1305_ZEROBYTES) {
+            $mlen0 = 64 - self::secretbox_xchacha20poly1305_ZEROBYTES;
+        }
+        $block0 .= ParagonIE_Sodium_Core32_Util::substr($plaintext, 0, $mlen0);
+
+        /** @var string $block0 */
+        $block0 = ParagonIE_Sodium_Core32_ChaCha20::streamXorIc(
+            $block0,
+            $nonceLast,
+            $subkey
+        );
+
+        /** @var string $c */
+        $c = ParagonIE_Sodium_Core32_Util::substr(
+            $block0,
+            self::secretbox_xchacha20poly1305_ZEROBYTES
+        );
+        if ($mlen > $mlen0) {
+            $c .= ParagonIE_Sodium_Core32_ChaCha20::streamXorIc(
+                ParagonIE_Sodium_Core32_Util::substr(
+                    $plaintext,
+                    self::secretbox_xchacha20poly1305_ZEROBYTES
+                ),
+                $nonceLast,
+                $subkey,
+                ParagonIE_Sodium_Core32_Util::store64_le(1)
+            );
+        }
+        $state = new ParagonIE_Sodium_Core32_Poly1305_State(
+            ParagonIE_Sodium_Core32_Util::substr(
+                $block0,
+                0,
+                self::onetimeauth_poly1305_KEYBYTES
+            )
+        );
+        try {
+            ParagonIE_Sodium_Compat::memzero($block0);
+            ParagonIE_Sodium_Compat::memzero($subkey);
+        } catch (SodiumException $ex) {
+            $block0 = null;
+            $subkey = null;
+        }
+
+        $state->update($c);
+
+        /** @var string $c - MAC || ciphertext */
+        $c = $state->finish() . $c;
+        unset($state);
+
+        return $c;
+    }
+
+    /**
+     * Decrypt a ciphertext generated via secretbox_xchacha20poly1305().
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $ciphertext
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function secretbox_xchacha20poly1305_open($ciphertext, $nonce, $key)
+    {
+        /** @var string $mac */
+        $mac = ParagonIE_Sodium_Core32_Util::substr(
+            $ciphertext,
+            0,
+            self::secretbox_xchacha20poly1305_MACBYTES
+        );
+
+        /** @var string $c */
+        $c = ParagonIE_Sodium_Core32_Util::substr(
+            $ciphertext,
+            self::secretbox_xchacha20poly1305_MACBYTES
+        );
+
+        /** @var int $clen */
+        $clen = ParagonIE_Sodium_Core32_Util::strlen($c);
+
+        /** @var string $subkey */
+        $subkey = ParagonIE_Sodium_Core32_HChaCha20::hchacha20($nonce, $key);
+
+        /** @var string $block0 */
+        $block0 = ParagonIE_Sodium_Core32_ChaCha20::stream(
+            64,
+            ParagonIE_Sodium_Core32_Util::substr($nonce, 16, 8),
+            $subkey
+        );
+        $verified = ParagonIE_Sodium_Core32_Poly1305::onetimeauth_verify(
+            $mac,
+            $c,
+            ParagonIE_Sodium_Core32_Util::substr($block0, 0, 32)
+        );
+
+        if (!$verified) {
+            try {
+                ParagonIE_Sodium_Compat::memzero($subkey);
+            } catch (SodiumException $ex) {
+                $subkey = null;
+            }
+            throw new SodiumException('Invalid MAC');
+        }
+
+        /** @var string $m - Decrypted message */
+        $m = ParagonIE_Sodium_Core32_Util::xorStrings(
+            ParagonIE_Sodium_Core32_Util::substr($block0, self::secretbox_xchacha20poly1305_ZEROBYTES),
+            ParagonIE_Sodium_Core32_Util::substr($c, 0, self::secretbox_xchacha20poly1305_ZEROBYTES)
+        );
+
+        if ($clen > self::secretbox_xchacha20poly1305_ZEROBYTES) {
+            // We had more than 1 block, so let's continue to decrypt the rest.
+            $m .= ParagonIE_Sodium_Core32_ChaCha20::streamXorIc(
+                ParagonIE_Sodium_Core32_Util::substr(
+                    $c,
+                    self::secretbox_xchacha20poly1305_ZEROBYTES
+                ),
+                ParagonIE_Sodium_Core32_Util::substr($nonce, 16, 8),
+                (string) $subkey,
+                ParagonIE_Sodium_Core32_Util::store64_le(1)
+            );
+        }
+        return $m;
+    }
+
+    /**
+     * @param string $key
+     * @return array<int, string> Returns a state and a header.
+     * @throws Exception
+     * @throws SodiumException
+     */
+    public static function secretstream_xchacha20poly1305_init_push($key)
+    {
+        # randombytes_buf(out, crypto_secretstream_xchacha20poly1305_HEADERBYTES);
+        $out = random_bytes(24);
+
+        # crypto_core_hchacha20(state->k, out, k, NULL);
+        $subkey = ParagonIE_Sodium_Core32_HChaCha20::hChaCha20($out, $key);
+        $state = new ParagonIE_Sodium_Core32_SecretStream_State(
+            $subkey,
+            ParagonIE_Sodium_Core32_Util::substr($out, 16, 8) . str_repeat("\0", 4)
+        );
+
+        # _crypto_secretstream_xchacha20poly1305_counter_reset(state);
+        $state->counterReset();
+
+        # memcpy(STATE_INONCE(state), out + crypto_core_hchacha20_INPUTBYTES,
+        #        crypto_secretstream_xchacha20poly1305_INONCEBYTES);
+        # memset(state->_pad, 0, sizeof state->_pad);
+        return array(
+            $state->toString(),
+            $out
+        );
+    }
+
+    /**
+     * @param string $key
+     * @param string $header
+     * @return string Returns a state.
+     * @throws Exception
+     */
+    public static function secretstream_xchacha20poly1305_init_pull($key, $header)
+    {
+        # crypto_core_hchacha20(state->k, in, k, NULL);
+        $subkey = ParagonIE_Sodium_Core32_HChaCha20::hChaCha20(
+            ParagonIE_Sodium_Core32_Util::substr($header, 0, 16),
+            $key
+        );
+        $state = new ParagonIE_Sodium_Core32_SecretStream_State(
+            $subkey,
+            ParagonIE_Sodium_Core32_Util::substr($header, 16)
+        );
+        $state->counterReset();
+        # memcpy(STATE_INONCE(state), in + crypto_core_hchacha20_INPUTBYTES,
+        #     crypto_secretstream_xchacha20poly1305_INONCEBYTES);
+        # memset(state->_pad, 0, sizeof state->_pad);
+        # return 0;
+        return $state->toString();
+    }
+
+    /**
+     * @param string $state
+     * @param string $msg
+     * @param string $aad
+     * @param int $tag
+     * @return string
+     * @throws SodiumException
+     */
+    public static function secretstream_xchacha20poly1305_push(&$state, $msg, $aad = '', $tag = 0)
+    {
+        $st = ParagonIE_Sodium_Core32_SecretStream_State::fromString($state);
+        # crypto_onetimeauth_poly1305_state poly1305_state;
+        # unsigned char                     block[64U];
+        # unsigned char                     slen[8U];
+        # unsigned char                    *c;
+        # unsigned char                    *mac;
+
+        $msglen = ParagonIE_Sodium_Core32_Util::strlen($msg);
+        $aadlen = ParagonIE_Sodium_Core32_Util::strlen($aad);
+
+        if ((($msglen + 63) >> 6) > 0xfffffffe) {
+            throw new SodiumException(
+                'message cannot be larger than SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_MESSAGEBYTES_MAX bytes'
+            );
+        }
+
+        # if (outlen_p != NULL) {
+        #     *outlen_p = 0U;
+        # }
+        # if (mlen > crypto_secretstream_xchacha20poly1305_MESSAGEBYTES_MAX) {
+        #     sodium_misuse();
+        # }
+
+        # crypto_stream_chacha20_ietf(block, sizeof block, state->nonce, state->k);
+        # crypto_onetimeauth_poly1305_init(&poly1305_state, block);
+        # sodium_memzero(block, sizeof block);
+        $auth = new ParagonIE_Sodium_Core32_Poly1305_State(
+            ParagonIE_Sodium_Core32_ChaCha20::ietfStream(32, $st->getCombinedNonce(), $st->getKey())
+        );
+
+        # crypto_onetimeauth_poly1305_update(&poly1305_state, ad, adlen);
+        $auth->update($aad);
+
+        # crypto_onetimeauth_poly1305_update(&poly1305_state, _pad0,
+        #     (0x10 - adlen) & 0xf);
+        $auth->update(str_repeat("\0", ((0x10 - $aadlen) & 0xf)));
+
+        # memset(block, 0, sizeof block);
+        # block[0] = tag;
+        # crypto_stream_chacha20_ietf_xor_ic(block, block, sizeof block,
+        #                                    state->nonce, 1U, state->k);
+        $block = ParagonIE_Sodium_Core32_ChaCha20::ietfStreamXorIc(
+            ParagonIE_Sodium_Core32_Util::intToChr($tag) . str_repeat("\0", 63),
+            $st->getCombinedNonce(),
+            $st->getKey(),
+            ParagonIE_Sodium_Core32_Util::store64_le(1)
+        );
+
+        # crypto_onetimeauth_poly1305_update(&poly1305_state, block, sizeof block);
+        $auth->update($block);
+
+        # out[0] = block[0];
+        $out = $block[0];
+        # c = out + (sizeof tag);
+        # crypto_stream_chacha20_ietf_xor_ic(c, m, mlen, state->nonce, 2U, state->k);
+        $cipher = ParagonIE_Sodium_Core32_ChaCha20::ietfStreamXorIc(
+            $msg,
+            $st->getCombinedNonce(),
+            $st->getKey(),
+            ParagonIE_Sodium_Core32_Util::store64_le(2)
+        );
+
+        # crypto_onetimeauth_poly1305_update(&poly1305_state, c, mlen);
+        $auth->update($cipher);
+
+        $out .= $cipher;
+        unset($cipher);
+
+        # crypto_onetimeauth_poly1305_update
+        # (&poly1305_state, _pad0, (0x10 - (sizeof block) + mlen) & 0xf);
+        $auth->update(str_repeat("\0", ((0x10 - 64 + $msglen) & 0xf)));
+
+        # STORE64_LE(slen, (uint64_t) adlen);
+        $slen = ParagonIE_Sodium_Core32_Util::store64_le($aadlen);
+
+        # crypto_onetimeauth_poly1305_update(&poly1305_state, slen, sizeof slen);
+        $auth->update($slen);
+
+        # STORE64_LE(slen, (sizeof block) + mlen);
+        $slen = ParagonIE_Sodium_Core32_Util::store64_le(64 + $msglen);
+
+        # crypto_onetimeauth_poly1305_update(&poly1305_state, slen, sizeof slen);
+        $auth->update($slen);
+
+        # mac = c + mlen;
+        # crypto_onetimeauth_poly1305_final(&poly1305_state, mac);
+        $mac = $auth->finish();
+        $out .= $mac;
+
+        # sodium_memzero(&poly1305_state, sizeof poly1305_state);
+        unset($auth);
+
+
+        # XOR_BUF(STATE_INONCE(state), mac,
+        #     crypto_secretstream_xchacha20poly1305_INONCEBYTES);
+        $st->xorNonce($mac);
+
+        # sodium_increment(STATE_COUNTER(state),
+        #     crypto_secretstream_xchacha20poly1305_COUNTERBYTES);
+        $st->incrementCounter();
+        // Overwrite by reference:
+        $state = $st->toString();
+
+        /** @var bool $rekey */
+        $rekey = ($tag & ParagonIE_Sodium_Compat::CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_TAG_REKEY) !== 0;
+        # if ((tag & crypto_secretstream_xchacha20poly1305_TAG_REKEY) != 0 ||
+        #     sodium_is_zero(STATE_COUNTER(state),
+        #         crypto_secretstream_xchacha20poly1305_COUNTERBYTES)) {
+        #     crypto_secretstream_xchacha20poly1305_rekey(state);
+        # }
+        if ($rekey || $st->needsRekey()) {
+            // DO REKEY
+            self::secretstream_xchacha20poly1305_rekey($state);
+        }
+        # if (outlen_p != NULL) {
+        #     *outlen_p = crypto_secretstream_xchacha20poly1305_ABYTES + mlen;
+        # }
+        return $out;
+    }
+
+    /**
+     * @param string $state
+     * @param string $cipher
+     * @param string $aad
+     * @return bool|array{0: string, 1: int}
+     * @throws SodiumException
+     */
+    public static function secretstream_xchacha20poly1305_pull(&$state, $cipher, $aad = '')
+    {
+        $st = ParagonIE_Sodium_Core32_SecretStream_State::fromString($state);
+
+        $cipherlen = ParagonIE_Sodium_Core32_Util::strlen($cipher);
+        #     mlen = inlen - crypto_secretstream_xchacha20poly1305_ABYTES;
+        $msglen = $cipherlen - ParagonIE_Sodium_Compat::CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_ABYTES;
+        $aadlen = ParagonIE_Sodium_Core32_Util::strlen($aad);
+
+        #     if (mlen > crypto_secretstream_xchacha20poly1305_MESSAGEBYTES_MAX) {
+        #         sodium_misuse();
+        #     }
+        if ((($msglen + 63) >> 6) > 0xfffffffe) {
+            throw new SodiumException(
+                'message cannot be larger than SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_MESSAGEBYTES_MAX bytes'
+            );
+        }
+
+        #     crypto_stream_chacha20_ietf(block, sizeof block, state->nonce, state->k);
+        #     crypto_onetimeauth_poly1305_init(&poly1305_state, block);
+        #     sodium_memzero(block, sizeof block);
+        $auth = new ParagonIE_Sodium_Core32_Poly1305_State(
+            ParagonIE_Sodium_Core32_ChaCha20::ietfStream(32, $st->getCombinedNonce(), $st->getKey())
+        );
+
+        #     crypto_onetimeauth_poly1305_update(&poly1305_state, ad, adlen);
+        $auth->update($aad);
+
+        #     crypto_onetimeauth_poly1305_update(&poly1305_state, _pad0,
+        #         (0x10 - adlen) & 0xf);
+        $auth->update(str_repeat("\0", ((0x10 - $aadlen) & 0xf)));
+
+
+        #     memset(block, 0, sizeof block);
+        #     block[0] = in[0];
+        #     crypto_stream_chacha20_ietf_xor_ic(block, block, sizeof block,
+        #                                        state->nonce, 1U, state->k);
+        $block = ParagonIE_Sodium_Core32_ChaCha20::ietfStreamXorIc(
+            $cipher[0] . str_repeat("\0", 63),
+            $st->getCombinedNonce(),
+            $st->getKey(),
+            ParagonIE_Sodium_Core32_Util::store64_le(1)
+        );
+        #     tag = block[0];
+        #     block[0] = in[0];
+        #     crypto_onetimeauth_poly1305_update(&poly1305_state, block, sizeof block);
+        $tag = ParagonIE_Sodium_Core32_Util::chrToInt($block[0]);
+        $block[0] = $cipher[0];
+        $auth->update($block);
+
+
+        #     c = in + (sizeof tag);
+        #     crypto_onetimeauth_poly1305_update(&poly1305_state, c, mlen);
+        $auth->update(ParagonIE_Sodium_Core32_Util::substr($cipher, 1, $msglen));
+
+        #     crypto_onetimeauth_poly1305_update
+        #     (&poly1305_state, _pad0, (0x10 - (sizeof block) + mlen) & 0xf);
+        $auth->update(str_repeat("\0", ((0x10 - 64 + $msglen) & 0xf)));
+
+        #     STORE64_LE(slen, (uint64_t) adlen);
+        #     crypto_onetimeauth_poly1305_update(&poly1305_state, slen, sizeof slen);
+        $slen = ParagonIE_Sodium_Core32_Util::store64_le($aadlen);
+        $auth->update($slen);
+
+        #     STORE64_LE(slen, (sizeof block) + mlen);
+        #     crypto_onetimeauth_poly1305_update(&poly1305_state, slen, sizeof slen);
+        $slen = ParagonIE_Sodium_Core32_Util::store64_le(64 + $msglen);
+        $auth->update($slen);
+
+        #     crypto_onetimeauth_poly1305_final(&poly1305_state, mac);
+        #     sodium_memzero(&poly1305_state, sizeof poly1305_state);
+        $mac = $auth->finish();
+
+        #     stored_mac = c + mlen;
+        #     if (sodium_memcmp(mac, stored_mac, sizeof mac) != 0) {
+        #     sodium_memzero(mac, sizeof mac);
+        #         return -1;
+        #     }
+
+        $stored = ParagonIE_Sodium_Core32_Util::substr($cipher, $msglen + 1, 16);
+        if (!ParagonIE_Sodium_Core32_Util::hashEquals($mac, $stored)) {
+            return false;
+        }
+
+        #     crypto_stream_chacha20_ietf_xor_ic(m, c, mlen, state->nonce, 2U, state->k);
+        $out = ParagonIE_Sodium_Core32_ChaCha20::ietfStreamXorIc(
+            ParagonIE_Sodium_Core32_Util::substr($cipher, 1, $msglen),
+            $st->getCombinedNonce(),
+            $st->getKey(),
+            ParagonIE_Sodium_Core32_Util::store64_le(2)
+        );
+
+        #     XOR_BUF(STATE_INONCE(state), mac,
+        #         crypto_secretstream_xchacha20poly1305_INONCEBYTES);
+        $st->xorNonce($mac);
+
+        #     sodium_increment(STATE_COUNTER(state),
+        #         crypto_secretstream_xchacha20poly1305_COUNTERBYTES);
+        $st->incrementCounter();
+
+        #     if ((tag & crypto_secretstream_xchacha20poly1305_TAG_REKEY) != 0 ||
+        #         sodium_is_zero(STATE_COUNTER(state),
+        #             crypto_secretstream_xchacha20poly1305_COUNTERBYTES)) {
+        #         crypto_secretstream_xchacha20poly1305_rekey(state);
+        #     }
+
+        // Overwrite by reference:
+        $state = $st->toString();
+
+        /** @var bool $rekey */
+        $rekey = ($tag & ParagonIE_Sodium_Compat::CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_TAG_REKEY) !== 0;
+        if ($rekey || $st->needsRekey()) {
+            // DO REKEY
+            self::secretstream_xchacha20poly1305_rekey($state);
+        }
+        return array($out, $tag);
+    }
+
+    /**
+     * @param string $state
+     * @return void
+     * @throws SodiumException
+     */
+    public static function secretstream_xchacha20poly1305_rekey(&$state)
+    {
+        $st = ParagonIE_Sodium_Core32_SecretStream_State::fromString($state);
+        # unsigned char new_key_and_inonce[crypto_stream_chacha20_ietf_KEYBYTES +
+        # crypto_secretstream_xchacha20poly1305_INONCEBYTES];
+        # size_t        i;
+        # for (i = 0U; i < crypto_stream_chacha20_ietf_KEYBYTES; i++) {
+        #     new_key_and_inonce[i] = state->k[i];
+        # }
+        $new_key_and_inonce = $st->getKey();
+
+        # for (i = 0U; i < crypto_secretstream_xchacha20poly1305_INONCEBYTES; i++) {
+        #     new_key_and_inonce[crypto_stream_chacha20_ietf_KEYBYTES + i] =
+        #         STATE_INONCE(state)[i];
+        # }
+        $new_key_and_inonce .= ParagonIE_Sodium_Core32_Util::substR($st->getNonce(), 0, 8);
+
+        # crypto_stream_chacha20_ietf_xor(new_key_and_inonce, new_key_and_inonce,
+        #                                 sizeof new_key_and_inonce,
+        #                                 state->nonce, state->k);
+
+        $st->rekey(ParagonIE_Sodium_Core32_ChaCha20::ietfStreamXorIc(
+            $new_key_and_inonce,
+            $st->getCombinedNonce(),
+            $st->getKey(),
+            ParagonIE_Sodium_Core32_Util::store64_le(0)
+        ));
+
+        # for (i = 0U; i < crypto_stream_chacha20_ietf_KEYBYTES; i++) {
+        #     state->k[i] = new_key_and_inonce[i];
+        # }
+        # for (i = 0U; i < crypto_secretstream_xchacha20poly1305_INONCEBYTES; i++) {
+        #     STATE_INONCE(state)[i] =
+        #          new_key_and_inonce[crypto_stream_chacha20_ietf_KEYBYTES + i];
+        # }
+        # _crypto_secretstream_xchacha20poly1305_counter_reset(state);
+        $st->counterReset();
+
+        $state = $st->toString();
+    }
+
+    /**
+     * Detached Ed25519 signature.
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $message
+     * @param string $sk
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function sign_detached($message, $sk)
+    {
+        return ParagonIE_Sodium_Core32_Ed25519::sign_detached($message, $sk);
+    }
+
+    /**
+     * Attached Ed25519 signature. (Returns a signed message.)
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $message
+     * @param string $sk
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function sign($message, $sk)
+    {
+        return ParagonIE_Sodium_Core32_Ed25519::sign($message, $sk);
+    }
+
+    /**
+     * Opens a signed message. If valid, returns the message.
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $signedMessage
+     * @param string $pk
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function sign_open($signedMessage, $pk)
+    {
+        return ParagonIE_Sodium_Core32_Ed25519::sign_open($signedMessage, $pk);
+    }
+
+    /**
+     * Verify a detached signature of a given message and public key.
+     *
+     * @internal Do not use this directly. Use ParagonIE_Sodium_Compat.
+     *
+     * @param string $signature
+     * @param string $message
+     * @param string $pk
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function sign_verify_detached($signature, $message, $pk)
+    {
+        return ParagonIE_Sodium_Core32_Ed25519::verify_detached($signature, $message, $pk);
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/File.php b/vendor/paragonie/sodium_compat/src/File.php
new file mode 100644
index 0000000..2b22171
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/File.php
@@ -0,0 +1,1560 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_File', false)) {
+    return;
+}
+/**
+ * Class ParagonIE_Sodium_File
+ */
+class ParagonIE_Sodium_File extends ParagonIE_Sodium_Core_Util
+{
+    /* PHP's default buffer size is 8192 for fread()/fwrite(). */
+    const BUFFER_SIZE = 8192;
+
+    /**
+     * Box a file (rather than a string). Uses less memory than
+     * ParagonIE_Sodium_Compat::crypto_box(), but produces
+     * the same result.
+     *
+     * @param string $inputFile  Absolute path to a file on the filesystem
+     * @param string $outputFile Absolute path to a file on the filesystem
+     * @param string $nonce      Number to be used only once
+     * @param string $keyPair    ECDH secret key and ECDH public key concatenated
+     *
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function box($inputFile, $outputFile, $nonce, $keyPair)
+    {
+        /* Type checks: */
+        if (!is_string($inputFile)) {
+            throw new TypeError('Argument 1 must be a string, ' . gettype($inputFile) . ' given.');
+        }
+        if (!is_string($outputFile)) {
+            throw new TypeError('Argument 2 must be a string, ' . gettype($outputFile) . ' given.');
+        }
+        if (!is_string($nonce)) {
+            throw new TypeError('Argument 3 must be a string, ' . gettype($nonce) . ' given.');
+        }
+
+        /* Input validation: */
+        if (!is_string($keyPair)) {
+            throw new TypeError('Argument 4 must be a string, ' . gettype($keyPair) . ' given.');
+        }
+        if (self::strlen($nonce) !== ParagonIE_Sodium_Compat::CRYPTO_BOX_NONCEBYTES) {
+            throw new TypeError('Argument 3 must be CRYPTO_BOX_NONCEBYTES bytes');
+        }
+        if (self::strlen($keyPair) !== ParagonIE_Sodium_Compat::CRYPTO_BOX_KEYPAIRBYTES) {
+            throw new TypeError('Argument 4 must be CRYPTO_BOX_KEYPAIRBYTES bytes');
+        }
+
+        /** @var int $size */
+        $size = filesize($inputFile);
+        if (!is_int($size)) {
+            throw new SodiumException('Could not obtain the file size');
+        }
+
+        /** @var resource $ifp */
+        $ifp = fopen($inputFile, 'rb');
+        if (!is_resource($ifp)) {
+            throw new SodiumException('Could not open input file for reading');
+        }
+
+        /** @var resource $ofp */
+        $ofp = fopen($outputFile, 'wb');
+        if (!is_resource($ofp)) {
+            fclose($ifp);
+            throw new SodiumException('Could not open output file for writing');
+        }
+
+        $res = self::box_encrypt($ifp, $ofp, $size, $nonce, $keyPair);
+        fclose($ifp);
+        fclose($ofp);
+        return $res;
+    }
+
+    /**
+     * Open a boxed file (rather than a string). Uses less memory than
+     * ParagonIE_Sodium_Compat::crypto_box_open(), but produces
+     * the same result.
+     *
+     * Warning: Does not protect against TOCTOU attacks. You should
+     * just load the file into memory and use crypto_box_open() if
+     * you are worried about those.
+     *
+     * @param string $inputFile
+     * @param string $outputFile
+     * @param string $nonce
+     * @param string $keypair
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function box_open($inputFile, $outputFile, $nonce, $keypair)
+    {
+        /* Type checks: */
+        if (!is_string($inputFile)) {
+            throw new TypeError('Argument 1 must be a string, ' . gettype($inputFile) . ' given.');
+        }
+        if (!is_string($outputFile)) {
+            throw new TypeError('Argument 2 must be a string, ' . gettype($outputFile) . ' given.');
+        }
+        if (!is_string($nonce)) {
+            throw new TypeError('Argument 3 must be a string, ' . gettype($nonce) . ' given.');
+        }
+        if (!is_string($keypair)) {
+            throw new TypeError('Argument 4 must be a string, ' . gettype($keypair) . ' given.');
+        }
+
+        /* Input validation: */
+        if (self::strlen($nonce) !== ParagonIE_Sodium_Compat::CRYPTO_BOX_NONCEBYTES) {
+            throw new TypeError('Argument 4 must be CRYPTO_BOX_NONCEBYTES bytes');
+        }
+        if (self::strlen($keypair) !== ParagonIE_Sodium_Compat::CRYPTO_BOX_KEYPAIRBYTES) {
+            throw new TypeError('Argument 4 must be CRYPTO_BOX_KEYPAIRBYTES bytes');
+        }
+
+        /** @var int $size */
+        $size = filesize($inputFile);
+        if (!is_int($size)) {
+            throw new SodiumException('Could not obtain the file size');
+        }
+
+        /** @var resource $ifp */
+        $ifp = fopen($inputFile, 'rb');
+        if (!is_resource($ifp)) {
+            throw new SodiumException('Could not open input file for reading');
+        }
+
+        /** @var resource $ofp */
+        $ofp = fopen($outputFile, 'wb');
+        if (!is_resource($ofp)) {
+            fclose($ifp);
+            throw new SodiumException('Could not open output file for writing');
+        }
+
+        $res = self::box_decrypt($ifp, $ofp, $size, $nonce, $keypair);
+        fclose($ifp);
+        fclose($ofp);
+        try {
+            ParagonIE_Sodium_Compat::memzero($nonce);
+            ParagonIE_Sodium_Compat::memzero($ephKeypair);
+        } catch (SodiumException $ex) {
+            if (isset($ephKeypair)) {
+                unset($ephKeypair);
+            }
+        }
+        return $res;
+    }
+
+    /**
+     * Seal a file (rather than a string). Uses less memory than
+     * ParagonIE_Sodium_Compat::crypto_box_seal(), but produces
+     * the same result.
+     *
+     * @param string $inputFile  Absolute path to a file on the filesystem
+     * @param string $outputFile Absolute path to a file on the filesystem
+     * @param string $publicKey  ECDH public key
+     *
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function box_seal($inputFile, $outputFile, $publicKey)
+    {
+        /* Type checks: */
+        if (!is_string($inputFile)) {
+            throw new TypeError('Argument 1 must be a string, ' . gettype($inputFile) . ' given.');
+        }
+        if (!is_string($outputFile)) {
+            throw new TypeError('Argument 2 must be a string, ' . gettype($outputFile) . ' given.');
+        }
+        if (!is_string($publicKey)) {
+            throw new TypeError('Argument 3 must be a string, ' . gettype($publicKey) . ' given.');
+        }
+
+        /* Input validation: */
+        if (self::strlen($publicKey) !== ParagonIE_Sodium_Compat::CRYPTO_BOX_PUBLICKEYBYTES) {
+            throw new TypeError('Argument 3 must be CRYPTO_BOX_PUBLICKEYBYTES bytes');
+        }
+
+        /** @var int $size */
+        $size = filesize($inputFile);
+        if (!is_int($size)) {
+            throw new SodiumException('Could not obtain the file size');
+        }
+
+        /** @var resource $ifp */
+        $ifp = fopen($inputFile, 'rb');
+        if (!is_resource($ifp)) {
+            throw new SodiumException('Could not open input file for reading');
+        }
+
+        /** @var resource $ofp */
+        $ofp = fopen($outputFile, 'wb');
+        if (!is_resource($ofp)) {
+            fclose($ifp);
+            throw new SodiumException('Could not open output file for writing');
+        }
+
+        /** @var string $ephKeypair */
+        $ephKeypair = ParagonIE_Sodium_Compat::crypto_box_keypair();
+
+        /** @var string $msgKeypair */
+        $msgKeypair = ParagonIE_Sodium_Compat::crypto_box_keypair_from_secretkey_and_publickey(
+            ParagonIE_Sodium_Compat::crypto_box_secretkey($ephKeypair),
+            $publicKey
+        );
+
+        /** @var string $ephemeralPK */
+        $ephemeralPK = ParagonIE_Sodium_Compat::crypto_box_publickey($ephKeypair);
+
+        /** @var string $nonce */
+        $nonce = ParagonIE_Sodium_Compat::crypto_generichash(
+            $ephemeralPK . $publicKey,
+            '',
+            24
+        );
+
+        /** @var int $firstWrite */
+        $firstWrite = fwrite(
+            $ofp,
+            $ephemeralPK,
+            ParagonIE_Sodium_Compat::CRYPTO_BOX_PUBLICKEYBYTES
+        );
+        if (!is_int($firstWrite)) {
+            fclose($ifp);
+            fclose($ofp);
+            ParagonIE_Sodium_Compat::memzero($ephKeypair);
+            throw new SodiumException('Could not write to output file');
+        }
+        if ($firstWrite !== ParagonIE_Sodium_Compat::CRYPTO_BOX_PUBLICKEYBYTES) {
+            ParagonIE_Sodium_Compat::memzero($ephKeypair);
+            fclose($ifp);
+            fclose($ofp);
+            throw new SodiumException('Error writing public key to output file');
+        }
+
+        $res = self::box_encrypt($ifp, $ofp, $size, $nonce, $msgKeypair);
+        fclose($ifp);
+        fclose($ofp);
+        try {
+            ParagonIE_Sodium_Compat::memzero($nonce);
+            ParagonIE_Sodium_Compat::memzero($ephKeypair);
+        } catch (SodiumException $ex) {
+            /** @psalm-suppress PossiblyUndefinedVariable */
+            unset($ephKeypair);
+        }
+        return $res;
+    }
+
+    /**
+     * Open a sealed file (rather than a string). Uses less memory than
+     * ParagonIE_Sodium_Compat::crypto_box_seal_open(), but produces
+     * the same result.
+     *
+     * Warning: Does not protect against TOCTOU attacks. You should
+     * just load the file into memory and use crypto_box_seal_open() if
+     * you are worried about those.
+     *
+     * @param string $inputFile
+     * @param string $outputFile
+     * @param string $ecdhKeypair
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function box_seal_open($inputFile, $outputFile, $ecdhKeypair)
+    {
+        /* Type checks: */
+        if (!is_string($inputFile)) {
+            throw new TypeError('Argument 1 must be a string, ' . gettype($inputFile) . ' given.');
+        }
+        if (!is_string($outputFile)) {
+            throw new TypeError('Argument 2 must be a string, ' . gettype($outputFile) . ' given.');
+        }
+        if (!is_string($ecdhKeypair)) {
+            throw new TypeError('Argument 3 must be a string, ' . gettype($ecdhKeypair) . ' given.');
+        }
+
+        /* Input validation: */
+        if (self::strlen($ecdhKeypair) !== ParagonIE_Sodium_Compat::CRYPTO_BOX_KEYPAIRBYTES) {
+            throw new TypeError('Argument 3 must be CRYPTO_BOX_KEYPAIRBYTES bytes');
+        }
+
+        $publicKey = ParagonIE_Sodium_Compat::crypto_box_publickey($ecdhKeypair);
+
+        /** @var int $size */
+        $size = filesize($inputFile);
+        if (!is_int($size)) {
+            throw new SodiumException('Could not obtain the file size');
+        }
+
+        /** @var resource $ifp */
+        $ifp = fopen($inputFile, 'rb');
+        if (!is_resource($ifp)) {
+            throw new SodiumException('Could not open input file for reading');
+        }
+
+        /** @var resource $ofp */
+        $ofp = fopen($outputFile, 'wb');
+        if (!is_resource($ofp)) {
+            fclose($ifp);
+            throw new SodiumException('Could not open output file for writing');
+        }
+
+        $ephemeralPK = fread($ifp, ParagonIE_Sodium_Compat::CRYPTO_BOX_PUBLICKEYBYTES);
+        if (!is_string($ephemeralPK)) {
+            throw new SodiumException('Could not read input file');
+        }
+        if (self::strlen($ephemeralPK) !== ParagonIE_Sodium_Compat::CRYPTO_BOX_PUBLICKEYBYTES) {
+            fclose($ifp);
+            fclose($ofp);
+            throw new SodiumException('Could not read public key from sealed file');
+        }
+
+        $nonce = ParagonIE_Sodium_Compat::crypto_generichash(
+            $ephemeralPK . $publicKey,
+            '',
+            24
+        );
+        $msgKeypair = ParagonIE_Sodium_Compat::crypto_box_keypair_from_secretkey_and_publickey(
+            ParagonIE_Sodium_Compat::crypto_box_secretkey($ecdhKeypair),
+            $ephemeralPK
+        );
+
+        $res = self::box_decrypt($ifp, $ofp, $size, $nonce, $msgKeypair);
+        fclose($ifp);
+        fclose($ofp);
+        try {
+            ParagonIE_Sodium_Compat::memzero($nonce);
+            ParagonIE_Sodium_Compat::memzero($ephKeypair);
+        } catch (SodiumException $ex) {
+            if (isset($ephKeypair)) {
+                unset($ephKeypair);
+            }
+        }
+        return $res;
+    }
+
+    /**
+     * Calculate the BLAKE2b hash of a file.
+     *
+     * @param string      $filePath     Absolute path to a file on the filesystem
+     * @param string|null $key          BLAKE2b key
+     * @param int         $outputLength Length of hash output
+     *
+     * @return string                   BLAKE2b hash
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress FailedTypeResolution
+     */
+    public static function generichash($filePath, $key = '', $outputLength = 32)
+    {
+        /* Type checks: */
+        if (!is_string($filePath)) {
+            throw new TypeError('Argument 1 must be a string, ' . gettype($filePath) . ' given.');
+        }
+        if (!is_string($key)) {
+            if (is_null($key)) {
+                $key = '';
+            } else {
+                throw new TypeError('Argument 2 must be a string, ' . gettype($key) . ' given.');
+            }
+        }
+        if (!is_int($outputLength)) {
+            if (!is_numeric($outputLength)) {
+                throw new TypeError('Argument 3 must be an integer, ' . gettype($outputLength) . ' given.');
+            }
+            $outputLength = (int) $outputLength;
+        }
+
+        /* Input validation: */
+        if (!empty($key)) {
+            if (self::strlen($key) < ParagonIE_Sodium_Compat::CRYPTO_GENERICHASH_KEYBYTES_MIN) {
+                throw new TypeError('Argument 2 must be at least CRYPTO_GENERICHASH_KEYBYTES_MIN bytes');
+            }
+            if (self::strlen($key) > ParagonIE_Sodium_Compat::CRYPTO_GENERICHASH_KEYBYTES_MAX) {
+                throw new TypeError('Argument 2 must be at most CRYPTO_GENERICHASH_KEYBYTES_MAX bytes');
+            }
+        }
+        if ($outputLength < ParagonIE_Sodium_Compat::CRYPTO_GENERICHASH_BYTES_MIN) {
+            throw new SodiumException('Argument 3 must be at least CRYPTO_GENERICHASH_BYTES_MIN');
+        }
+        if ($outputLength > ParagonIE_Sodium_Compat::CRYPTO_GENERICHASH_BYTES_MAX) {
+            throw new SodiumException('Argument 3 must be at least CRYPTO_GENERICHASH_BYTES_MAX');
+        }
+
+        /** @var int $size */
+        $size = filesize($filePath);
+        if (!is_int($size)) {
+            throw new SodiumException('Could not obtain the file size');
+        }
+
+        /** @var resource $fp */
+        $fp = fopen($filePath, 'rb');
+        if (!is_resource($fp)) {
+            throw new SodiumException('Could not open input file for reading');
+        }
+        $ctx = ParagonIE_Sodium_Compat::crypto_generichash_init($key, $outputLength);
+        while ($size > 0) {
+            $blockSize = $size > 64
+                ? 64
+                : $size;
+            $read = fread($fp, $blockSize);
+            if (!is_string($read)) {
+                throw new SodiumException('Could not read input file');
+            }
+            ParagonIE_Sodium_Compat::crypto_generichash_update($ctx, $read);
+            $size -= $blockSize;
+        }
+
+        fclose($fp);
+        return ParagonIE_Sodium_Compat::crypto_generichash_final($ctx, $outputLength);
+    }
+
+    /**
+     * Encrypt a file (rather than a string). Uses less memory than
+     * ParagonIE_Sodium_Compat::crypto_secretbox(), but produces
+     * the same result.
+     *
+     * @param string $inputFile  Absolute path to a file on the filesystem
+     * @param string $outputFile Absolute path to a file on the filesystem
+     * @param string $nonce      Number to be used only once
+     * @param string $key        Encryption key
+     *
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function secretbox($inputFile, $outputFile, $nonce, $key)
+    {
+        /* Type checks: */
+        if (!is_string($inputFile)) {
+            throw new TypeError('Argument 1 must be a string, ' . gettype($inputFile) . ' given..');
+        }
+        if (!is_string($outputFile)) {
+            throw new TypeError('Argument 2 must be a string, ' . gettype($outputFile) . ' given.');
+        }
+        if (!is_string($nonce)) {
+            throw new TypeError('Argument 3 must be a string, ' . gettype($nonce) . ' given.');
+        }
+
+        /* Input validation: */
+        if (self::strlen($nonce) !== ParagonIE_Sodium_Compat::CRYPTO_SECRETBOX_NONCEBYTES) {
+            throw new TypeError('Argument 3 must be CRYPTO_SECRETBOX_NONCEBYTES bytes');
+        }
+        if (!is_string($key)) {
+            throw new TypeError('Argument 4 must be a string, ' . gettype($key) . ' given.');
+        }
+        if (self::strlen($key) !== ParagonIE_Sodium_Compat::CRYPTO_SECRETBOX_KEYBYTES) {
+            throw new TypeError('Argument 4 must be CRYPTO_SECRETBOX_KEYBYTES bytes');
+        }
+
+        /** @var int $size */
+        $size = filesize($inputFile);
+        if (!is_int($size)) {
+            throw new SodiumException('Could not obtain the file size');
+        }
+
+        /** @var resource $ifp */
+        $ifp = fopen($inputFile, 'rb');
+        if (!is_resource($ifp)) {
+            throw new SodiumException('Could not open input file for reading');
+        }
+
+        /** @var resource $ofp */
+        $ofp = fopen($outputFile, 'wb');
+        if (!is_resource($ofp)) {
+            fclose($ifp);
+            throw new SodiumException('Could not open output file for writing');
+        }
+
+        $res = self::secretbox_encrypt($ifp, $ofp, $size, $nonce, $key);
+        fclose($ifp);
+        fclose($ofp);
+        return $res;
+    }
+    /**
+     * Seal a file (rather than a string). Uses less memory than
+     * ParagonIE_Sodium_Compat::crypto_secretbox_open(), but produces
+     * the same result.
+     *
+     * Warning: Does not protect against TOCTOU attacks. You should
+     * just load the file into memory and use crypto_secretbox_open() if
+     * you are worried about those.
+     *
+     * @param string $inputFile
+     * @param string $outputFile
+     * @param string $nonce
+     * @param string $key
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function secretbox_open($inputFile, $outputFile, $nonce, $key)
+    {
+        /* Type checks: */
+        if (!is_string($inputFile)) {
+            throw new TypeError('Argument 1 must be a string, ' . gettype($inputFile) . ' given.');
+        }
+        if (!is_string($outputFile)) {
+            throw new TypeError('Argument 2 must be a string, ' . gettype($outputFile) . ' given.');
+        }
+        if (!is_string($nonce)) {
+            throw new TypeError('Argument 3 must be a string, ' . gettype($nonce) . ' given.');
+        }
+        if (!is_string($key)) {
+            throw new TypeError('Argument 4 must be a string, ' . gettype($key) . ' given.');
+        }
+
+        /* Input validation: */
+        if (self::strlen($nonce) !== ParagonIE_Sodium_Compat::CRYPTO_SECRETBOX_NONCEBYTES) {
+            throw new TypeError('Argument 4 must be CRYPTO_SECRETBOX_NONCEBYTES bytes');
+        }
+        if (self::strlen($key) !== ParagonIE_Sodium_Compat::CRYPTO_SECRETBOX_KEYBYTES) {
+            throw new TypeError('Argument 4 must be CRYPTO_SECRETBOXBOX_KEYBYTES bytes');
+        }
+
+        /** @var int $size */
+        $size = filesize($inputFile);
+        if (!is_int($size)) {
+            throw new SodiumException('Could not obtain the file size');
+        }
+
+        /** @var resource $ifp */
+        $ifp = fopen($inputFile, 'rb');
+        if (!is_resource($ifp)) {
+            throw new SodiumException('Could not open input file for reading');
+        }
+
+        /** @var resource $ofp */
+        $ofp = fopen($outputFile, 'wb');
+        if (!is_resource($ofp)) {
+            fclose($ifp);
+            throw new SodiumException('Could not open output file for writing');
+        }
+
+        $res = self::secretbox_decrypt($ifp, $ofp, $size, $nonce, $key);
+        fclose($ifp);
+        fclose($ofp);
+        try {
+            ParagonIE_Sodium_Compat::memzero($key);
+        } catch (SodiumException $ex) {
+            /** @psalm-suppress PossiblyUndefinedVariable */
+            unset($key);
+        }
+        return $res;
+    }
+
+    /**
+     * Sign a file (rather than a string). Uses less memory than
+     * ParagonIE_Sodium_Compat::crypto_sign_detached(), but produces
+     * the same result.
+     *
+     * @param string $filePath  Absolute path to a file on the filesystem
+     * @param string $secretKey Secret signing key
+     *
+     * @return string           Ed25519 signature
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function sign($filePath, $secretKey)
+    {
+        /* Type checks: */
+        if (!is_string($filePath)) {
+            throw new TypeError('Argument 1 must be a string, ' . gettype($filePath) . ' given.');
+        }
+        if (!is_string($secretKey)) {
+            throw new TypeError('Argument 2 must be a string, ' . gettype($secretKey) . ' given.');
+        }
+
+        /* Input validation: */
+        if (self::strlen($secretKey) !== ParagonIE_Sodium_Compat::CRYPTO_SIGN_SECRETKEYBYTES) {
+            throw new TypeError('Argument 2 must be CRYPTO_SIGN_SECRETKEYBYTES bytes');
+        }
+        if (PHP_INT_SIZE === 4) {
+            return self::sign_core32($filePath, $secretKey);
+        }
+
+        /** @var int $size */
+        $size = filesize($filePath);
+        if (!is_int($size)) {
+            throw new SodiumException('Could not obtain the file size');
+        }
+
+        /** @var resource $fp */
+        $fp = fopen($filePath, 'rb');
+        if (!is_resource($fp)) {
+            throw new SodiumException('Could not open input file for reading');
+        }
+
+        /** @var string $az */
+        $az = hash('sha512', self::substr($secretKey, 0, 32), true);
+
+        $az[0] = self::intToChr(self::chrToInt($az[0]) & 248);
+        $az[31] = self::intToChr((self::chrToInt($az[31]) & 63) | 64);
+
+        $hs = hash_init('sha512');
+        self::hash_update($hs, self::substr($az, 32, 32));
+        /** @var resource $hs */
+        $hs = self::updateHashWithFile($hs, $fp, $size);
+
+        /** @var string $nonceHash */
+        $nonceHash = hash_final($hs, true);
+
+        /** @var string $pk */
+        $pk = self::substr($secretKey, 32, 32);
+
+        /** @var string $nonce */
+        $nonce = ParagonIE_Sodium_Core_Ed25519::sc_reduce($nonceHash) . self::substr($nonceHash, 32);
+
+        /** @var string $sig */
+        $sig = ParagonIE_Sodium_Core_Ed25519::ge_p3_tobytes(
+            ParagonIE_Sodium_Core_Ed25519::ge_scalarmult_base($nonce)
+        );
+
+        $hs = hash_init('sha512');
+        self::hash_update($hs, self::substr($sig, 0, 32));
+        self::hash_update($hs, self::substr($pk, 0, 32));
+        /** @var resource $hs */
+        $hs = self::updateHashWithFile($hs, $fp, $size);
+
+        /** @var string $hramHash */
+        $hramHash = hash_final($hs, true);
+
+        /** @var string $hram */
+        $hram = ParagonIE_Sodium_Core_Ed25519::sc_reduce($hramHash);
+
+        /** @var string $sigAfter */
+        $sigAfter = ParagonIE_Sodium_Core_Ed25519::sc_muladd($hram, $az, $nonce);
+
+        /** @var string $sig */
+        $sig = self::substr($sig, 0, 32) . self::substr($sigAfter, 0, 32);
+
+        try {
+            ParagonIE_Sodium_Compat::memzero($az);
+        } catch (SodiumException $ex) {
+            $az = null;
+        }
+        fclose($fp);
+        return $sig;
+    }
+
+    /**
+     * Verify a file (rather than a string). Uses less memory than
+     * ParagonIE_Sodium_Compat::crypto_sign_verify_detached(), but
+     * produces the same result.
+     *
+     * @param string $sig       Ed25519 signature
+     * @param string $filePath  Absolute path to a file on the filesystem
+     * @param string $publicKey Signing public key
+     *
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     * @throws Exception
+     */
+    public static function verify($sig, $filePath, $publicKey)
+    {
+        /* Type checks: */
+        if (!is_string($sig)) {
+            throw new TypeError('Argument 1 must be a string, ' . gettype($sig) . ' given.');
+        }
+        if (!is_string($filePath)) {
+            throw new TypeError('Argument 2 must be a string, ' . gettype($filePath) . ' given.');
+        }
+        if (!is_string($publicKey)) {
+            throw new TypeError('Argument 3 must be a string, ' . gettype($publicKey) . ' given.');
+        }
+
+        /* Input validation: */
+        if (self::strlen($sig) !== ParagonIE_Sodium_Compat::CRYPTO_SIGN_BYTES) {
+            throw new TypeError('Argument 1 must be CRYPTO_SIGN_BYTES bytes');
+        }
+        if (self::strlen($publicKey) !== ParagonIE_Sodium_Compat::CRYPTO_SIGN_PUBLICKEYBYTES) {
+            throw new TypeError('Argument 3 must be CRYPTO_SIGN_PUBLICKEYBYTES bytes');
+        }
+        if (self::strlen($sig) < 64) {
+            throw new SodiumException('Signature is too short');
+        }
+
+        if (PHP_INT_SIZE === 4) {
+            return self::verify_core32($sig, $filePath, $publicKey);
+        }
+
+        /* Security checks */
+        if (
+            (ParagonIE_Sodium_Core_Ed25519::chrToInt($sig[63]) & 240)
+                &&
+            ParagonIE_Sodium_Core_Ed25519::check_S_lt_L(self::substr($sig, 32, 32))
+        ) {
+            throw new SodiumException('S < L - Invalid signature');
+        }
+        if (ParagonIE_Sodium_Core_Ed25519::small_order($sig)) {
+            throw new SodiumException('Signature is on too small of an order');
+        }
+        if ((self::chrToInt($sig[63]) & 224) !== 0) {
+            throw new SodiumException('Invalid signature');
+        }
+        $d = 0;
+        for ($i = 0; $i < 32; ++$i) {
+            $d |= self::chrToInt($publicKey[$i]);
+        }
+        if ($d === 0) {
+            throw new SodiumException('All zero public key');
+        }
+
+        /** @var int $size */
+        $size = filesize($filePath);
+        if (!is_int($size)) {
+            throw new SodiumException('Could not obtain the file size');
+        }
+
+        /** @var resource $fp */
+        $fp = fopen($filePath, 'rb');
+        if (!is_resource($fp)) {
+            throw new SodiumException('Could not open input file for reading');
+        }
+
+        /** @var bool The original value of ParagonIE_Sodium_Compat::$fastMult */
+        $orig = ParagonIE_Sodium_Compat::$fastMult;
+
+        // Set ParagonIE_Sodium_Compat::$fastMult to true to speed up verification.
+        ParagonIE_Sodium_Compat::$fastMult = true;
+
+        /** @var ParagonIE_Sodium_Core_Curve25519_Ge_P3 $A */
+        $A = ParagonIE_Sodium_Core_Ed25519::ge_frombytes_negate_vartime($publicKey);
+
+        $hs = hash_init('sha512');
+        self::hash_update($hs, self::substr($sig, 0, 32));
+        self::hash_update($hs, self::substr($publicKey, 0, 32));
+        /** @var resource $hs */
+        $hs = self::updateHashWithFile($hs, $fp, $size);
+        /** @var string $hDigest */
+        $hDigest = hash_final($hs, true);
+
+        /** @var string $h */
+        $h = ParagonIE_Sodium_Core_Ed25519::sc_reduce($hDigest) . self::substr($hDigest, 32);
+
+        /** @var ParagonIE_Sodium_Core_Curve25519_Ge_P2 $R */
+        $R = ParagonIE_Sodium_Core_Ed25519::ge_double_scalarmult_vartime(
+            $h,
+            $A,
+            self::substr($sig, 32)
+        );
+
+        /** @var string $rcheck */
+        $rcheck = ParagonIE_Sodium_Core_Ed25519::ge_tobytes($R);
+
+        // Close the file handle
+        fclose($fp);
+
+        // Reset ParagonIE_Sodium_Compat::$fastMult to what it was before.
+        ParagonIE_Sodium_Compat::$fastMult = $orig;
+        return self::verify_32($rcheck, self::substr($sig, 0, 32));
+    }
+
+    /**
+     * @param resource $ifp
+     * @param resource $ofp
+     * @param int      $mlen
+     * @param string   $nonce
+     * @param string   $boxKeypair
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    protected static function box_encrypt($ifp, $ofp, $mlen, $nonce, $boxKeypair)
+    {
+        if (PHP_INT_SIZE === 4) {
+            return self::secretbox_encrypt(
+                $ifp,
+                $ofp,
+                $mlen,
+                $nonce,
+                ParagonIE_Sodium_Crypto32::box_beforenm(
+                    ParagonIE_Sodium_Crypto32::box_secretkey($boxKeypair),
+                    ParagonIE_Sodium_Crypto32::box_publickey($boxKeypair)
+                )
+            );
+        }
+        return self::secretbox_encrypt(
+            $ifp,
+            $ofp,
+            $mlen,
+            $nonce,
+            ParagonIE_Sodium_Crypto::box_beforenm(
+                ParagonIE_Sodium_Crypto::box_secretkey($boxKeypair),
+                ParagonIE_Sodium_Crypto::box_publickey($boxKeypair)
+            )
+        );
+    }
+
+
+    /**
+     * @param resource $ifp
+     * @param resource $ofp
+     * @param int      $mlen
+     * @param string   $nonce
+     * @param string   $boxKeypair
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    protected static function box_decrypt($ifp, $ofp, $mlen, $nonce, $boxKeypair)
+    {
+        if (PHP_INT_SIZE === 4) {
+            return self::secretbox_decrypt(
+                $ifp,
+                $ofp,
+                $mlen,
+                $nonce,
+                ParagonIE_Sodium_Crypto32::box_beforenm(
+                    ParagonIE_Sodium_Crypto32::box_secretkey($boxKeypair),
+                    ParagonIE_Sodium_Crypto32::box_publickey($boxKeypair)
+                )
+            );
+        }
+        return self::secretbox_decrypt(
+            $ifp,
+            $ofp,
+            $mlen,
+            $nonce,
+            ParagonIE_Sodium_Crypto::box_beforenm(
+                ParagonIE_Sodium_Crypto::box_secretkey($boxKeypair),
+                ParagonIE_Sodium_Crypto::box_publickey($boxKeypair)
+            )
+        );
+    }
+
+    /**
+     * Encrypt a file
+     *
+     * @param resource $ifp
+     * @param resource $ofp
+     * @param int $mlen
+     * @param string $nonce
+     * @param string $key
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    protected static function secretbox_encrypt($ifp, $ofp, $mlen, $nonce, $key)
+    {
+        if (PHP_INT_SIZE === 4) {
+            return self::secretbox_encrypt_core32($ifp, $ofp, $mlen, $nonce, $key);
+        }
+
+        $plaintext = fread($ifp, 32);
+        if (!is_string($plaintext)) {
+            throw new SodiumException('Could not read input file');
+        }
+        $first32 = self::ftell($ifp);
+
+        /** @var string $subkey */
+        $subkey = ParagonIE_Sodium_Core_HSalsa20::hsalsa20($nonce, $key);
+
+        /** @var string $realNonce */
+        $realNonce = ParagonIE_Sodium_Core_Util::substr($nonce, 16, 8);
+
+        /** @var string $block0 */
+        $block0 = str_repeat("\x00", 32);
+
+        /** @var int $mlen - Length of the plaintext message */
+        $mlen0 = $mlen;
+        if ($mlen0 > 64 - ParagonIE_Sodium_Crypto::secretbox_xsalsa20poly1305_ZEROBYTES) {
+            $mlen0 = 64 - ParagonIE_Sodium_Crypto::secretbox_xsalsa20poly1305_ZEROBYTES;
+        }
+        $block0 .= ParagonIE_Sodium_Core_Util::substr($plaintext, 0, $mlen0);
+
+        /** @var string $block0 */
+        $block0 = ParagonIE_Sodium_Core_Salsa20::salsa20_xor(
+            $block0,
+            $realNonce,
+            $subkey
+        );
+
+        $state = new ParagonIE_Sodium_Core_Poly1305_State(
+            ParagonIE_Sodium_Core_Util::substr(
+                $block0,
+                0,
+                ParagonIE_Sodium_Crypto::onetimeauth_poly1305_KEYBYTES
+            )
+        );
+
+        // Pre-write 16 blank bytes for the Poly1305 tag
+        $start = self::ftell($ofp);
+        fwrite($ofp, str_repeat("\x00", 16));
+
+        /** @var string $c */
+        $cBlock = ParagonIE_Sodium_Core_Util::substr(
+            $block0,
+            ParagonIE_Sodium_Crypto::secretbox_xsalsa20poly1305_ZEROBYTES
+        );
+        $state->update($cBlock);
+        fwrite($ofp, $cBlock);
+        $mlen -= 32;
+
+        /** @var int $iter */
+        $iter = 1;
+
+        /** @var int $incr */
+        $incr = self::BUFFER_SIZE >> 6;
+
+        /*
+         * Set the cursor to the end of the first half-block. All future bytes will
+         * generated from salsa20_xor_ic, starting from 1 (second block).
+         */
+        fseek($ifp, $first32, SEEK_SET);
+
+        while ($mlen > 0) {
+            $blockSize = $mlen > self::BUFFER_SIZE
+                ? self::BUFFER_SIZE
+                : $mlen;
+            $plaintext = fread($ifp, $blockSize);
+            if (!is_string($plaintext)) {
+                throw new SodiumException('Could not read input file');
+            }
+            $cBlock = ParagonIE_Sodium_Core_Salsa20::salsa20_xor_ic(
+                $plaintext,
+                $realNonce,
+                $iter,
+                $subkey
+            );
+            fwrite($ofp, $cBlock, $blockSize);
+            $state->update($cBlock);
+
+            $mlen -= $blockSize;
+            $iter += $incr;
+        }
+        try {
+            ParagonIE_Sodium_Compat::memzero($block0);
+            ParagonIE_Sodium_Compat::memzero($subkey);
+        } catch (SodiumException $ex) {
+            $block0 = null;
+            $subkey = null;
+        }
+        $end = self::ftell($ofp);
+
+        /*
+         * Write the Poly1305 authentication tag that provides integrity
+         * over the ciphertext (encrypt-then-MAC)
+         */
+        fseek($ofp, $start, SEEK_SET);
+        fwrite($ofp, $state->finish(), ParagonIE_Sodium_Compat::CRYPTO_SECRETBOX_MACBYTES);
+        fseek($ofp, $end, SEEK_SET);
+        unset($state);
+
+        return true;
+    }
+
+    /**
+     * Decrypt a file
+     *
+     * @param resource $ifp
+     * @param resource $ofp
+     * @param int $mlen
+     * @param string $nonce
+     * @param string $key
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    protected static function secretbox_decrypt($ifp, $ofp, $mlen, $nonce, $key)
+    {
+        if (PHP_INT_SIZE === 4) {
+            return self::secretbox_decrypt_core32($ifp, $ofp, $mlen, $nonce, $key);
+        }
+        $tag = fread($ifp, 16);
+        if (!is_string($tag)) {
+            throw new SodiumException('Could not read input file');
+        }
+
+        /** @var string $subkey */
+        $subkey = ParagonIE_Sodium_Core_HSalsa20::hsalsa20($nonce, $key);
+
+        /** @var string $realNonce */
+        $realNonce = ParagonIE_Sodium_Core_Util::substr($nonce, 16, 8);
+
+        /** @var string $block0 */
+        $block0 = ParagonIE_Sodium_Core_Salsa20::salsa20(
+            64,
+            ParagonIE_Sodium_Core_Util::substr($nonce, 16, 8),
+            $subkey
+        );
+
+        /* Verify the Poly1305 MAC -before- attempting to decrypt! */
+        $state = new ParagonIE_Sodium_Core_Poly1305_State(self::substr($block0, 0, 32));
+        if (!self::onetimeauth_verify($state, $ifp, $tag, $mlen)) {
+            throw new SodiumException('Invalid MAC');
+        }
+
+        /*
+         * Set the cursor to the end of the first half-block. All future bytes will
+         * generated from salsa20_xor_ic, starting from 1 (second block).
+         */
+        $first32 = fread($ifp, 32);
+        if (!is_string($first32)) {
+            throw new SodiumException('Could not read input file');
+        }
+        $first32len = self::strlen($first32);
+        fwrite(
+            $ofp,
+            self::xorStrings(
+                self::substr($block0, 32, $first32len),
+                self::substr($first32, 0, $first32len)
+            )
+        );
+        $mlen -= 32;
+
+        /** @var int $iter */
+        $iter = 1;
+
+        /** @var int $incr */
+        $incr = self::BUFFER_SIZE >> 6;
+
+        /* Decrypts ciphertext, writes to output file. */
+        while ($mlen > 0) {
+            $blockSize = $mlen > self::BUFFER_SIZE
+                ? self::BUFFER_SIZE
+                : $mlen;
+            $ciphertext = fread($ifp, $blockSize);
+            if (!is_string($ciphertext)) {
+                throw new SodiumException('Could not read input file');
+            }
+            $pBlock = ParagonIE_Sodium_Core_Salsa20::salsa20_xor_ic(
+                $ciphertext,
+                $realNonce,
+                $iter,
+                $subkey
+            );
+            fwrite($ofp, $pBlock, $blockSize);
+            $mlen -= $blockSize;
+            $iter += $incr;
+        }
+        return true;
+    }
+
+    /**
+     * @param ParagonIE_Sodium_Core_Poly1305_State $state
+     * @param resource $ifp
+     * @param string $tag
+     * @param int $mlen
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    protected static function onetimeauth_verify(
+        ParagonIE_Sodium_Core_Poly1305_State $state,
+        $ifp,
+        $tag = '',
+        $mlen = 0
+    ) {
+        /** @var int $pos */
+        $pos = self::ftell($ifp);
+
+        /** @var int $iter */
+        $iter = 1;
+
+        /** @var int $incr */
+        $incr = self::BUFFER_SIZE >> 6;
+
+        while ($mlen > 0) {
+            $blockSize = $mlen > self::BUFFER_SIZE
+                ? self::BUFFER_SIZE
+                : $mlen;
+            $ciphertext = fread($ifp, $blockSize);
+            if (!is_string($ciphertext)) {
+                throw new SodiumException('Could not read input file');
+            }
+            $state->update($ciphertext);
+            $mlen -= $blockSize;
+            $iter += $incr;
+        }
+        $res = ParagonIE_Sodium_Core_Util::verify_16($tag, $state->finish());
+
+        fseek($ifp, $pos, SEEK_SET);
+        return $res;
+    }
+
+    /**
+     * Update a hash context with the contents of a file, without
+     * loading the entire file into memory.
+     *
+     * @param resource|HashContext $hash
+     * @param resource $fp
+     * @param int $size
+     * @return resource|object Resource on PHP < 7.2, HashContext object on PHP >= 7.2
+     * @throws SodiumException
+     * @throws TypeError
+     * @psalm-suppress PossiblyInvalidArgument
+     *                 PHP 7.2 changes from a resource to an object,
+     *                 which causes Psalm to complain about an error.
+     * @psalm-suppress TypeCoercion
+     *                 Ditto.
+     */
+    public static function updateHashWithFile($hash, $fp, $size = 0)
+    {
+        /* Type checks: */
+        if (PHP_VERSION_ID < 70200) {
+            if (!is_resource($hash)) {
+                throw new TypeError('Argument 1 must be a resource, ' . gettype($hash) . ' given.');
+            }
+        } else {
+            if (!is_object($hash)) {
+                throw new TypeError('Argument 1 must be an object (PHP 7.2+), ' . gettype($hash) . ' given.');
+            }
+        }
+
+        if (!is_resource($fp)) {
+            throw new TypeError('Argument 2 must be a resource, ' . gettype($fp) . ' given.');
+        }
+        if (!is_int($size)) {
+            throw new TypeError('Argument 3 must be an integer, ' . gettype($size) . ' given.');
+        }
+
+        /** @var int $originalPosition */
+        $originalPosition = self::ftell($fp);
+
+        // Move file pointer to beginning of file
+        fseek($fp, 0, SEEK_SET);
+        for ($i = 0; $i < $size; $i += self::BUFFER_SIZE) {
+            /** @var string|bool $message */
+            $message = fread(
+                $fp,
+                ($size - $i) > self::BUFFER_SIZE
+                    ? $size - $i
+                    : self::BUFFER_SIZE
+            );
+            if (!is_string($message)) {
+                throw new SodiumException('Unexpected error reading from file.');
+            }
+            /** @var string $message */
+            /** @psalm-suppress InvalidArgument */
+            self::hash_update($hash, $message);
+        }
+        // Reset file pointer's position
+        fseek($fp, $originalPosition, SEEK_SET);
+        return $hash;
+    }
+
+    /**
+     * Sign a file (rather than a string). Uses less memory than
+     * ParagonIE_Sodium_Compat::crypto_sign_detached(), but produces
+     * the same result. (32-bit)
+     *
+     * @param string $filePath  Absolute path to a file on the filesystem
+     * @param string $secretKey Secret signing key
+     *
+     * @return string           Ed25519 signature
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    private static function sign_core32($filePath, $secretKey)
+    {
+        /** @var int|bool $size */
+        $size = filesize($filePath);
+        if (!is_int($size)) {
+            throw new SodiumException('Could not obtain the file size');
+        }
+        /** @var int $size */
+
+        /** @var resource|bool $fp */
+        $fp = fopen($filePath, 'rb');
+        if (!is_resource($fp)) {
+            throw new SodiumException('Could not open input file for reading');
+        }
+        /** @var resource $fp */
+
+        /** @var string $az */
+        $az = hash('sha512', self::substr($secretKey, 0, 32), true);
+
+        $az[0] = self::intToChr(self::chrToInt($az[0]) & 248);
+        $az[31] = self::intToChr((self::chrToInt($az[31]) & 63) | 64);
+
+        $hs = hash_init('sha512');
+        self::hash_update($hs, self::substr($az, 32, 32));
+        /** @var resource $hs */
+        $hs = self::updateHashWithFile($hs, $fp, $size);
+
+        /** @var string $nonceHash */
+        $nonceHash = hash_final($hs, true);
+
+        /** @var string $pk */
+        $pk = self::substr($secretKey, 32, 32);
+
+        /** @var string $nonce */
+        $nonce = ParagonIE_Sodium_Core32_Ed25519::sc_reduce($nonceHash) . self::substr($nonceHash, 32);
+
+        /** @var string $sig */
+        $sig = ParagonIE_Sodium_Core32_Ed25519::ge_p3_tobytes(
+            ParagonIE_Sodium_Core32_Ed25519::ge_scalarmult_base($nonce)
+        );
+
+        $hs = hash_init('sha512');
+        self::hash_update($hs, self::substr($sig, 0, 32));
+        self::hash_update($hs, self::substr($pk, 0, 32));
+        /** @var resource $hs */
+        $hs = self::updateHashWithFile($hs, $fp, $size);
+
+        /** @var string $hramHash */
+        $hramHash = hash_final($hs, true);
+
+        /** @var string $hram */
+        $hram = ParagonIE_Sodium_Core32_Ed25519::sc_reduce($hramHash);
+
+        /** @var string $sigAfter */
+        $sigAfter = ParagonIE_Sodium_Core32_Ed25519::sc_muladd($hram, $az, $nonce);
+
+        /** @var string $sig */
+        $sig = self::substr($sig, 0, 32) . self::substr($sigAfter, 0, 32);
+
+        try {
+            ParagonIE_Sodium_Compat::memzero($az);
+        } catch (SodiumException $ex) {
+            $az = null;
+        }
+        fclose($fp);
+        return $sig;
+    }
+
+    /**
+     *
+     * Verify a file (rather than a string). Uses less memory than
+     * ParagonIE_Sodium_Compat::crypto_sign_verify_detached(), but
+     * produces the same result. (32-bit)
+     *
+     * @param string $sig       Ed25519 signature
+     * @param string $filePath  Absolute path to a file on the filesystem
+     * @param string $publicKey Signing public key
+     *
+     * @return bool
+     * @throws SodiumException
+     * @throws Exception
+     */
+    public static function verify_core32($sig, $filePath, $publicKey)
+    {
+        /* Security checks */
+        if (ParagonIE_Sodium_Core32_Ed25519::check_S_lt_L(self::substr($sig, 32, 32))) {
+            throw new SodiumException('S < L - Invalid signature');
+        }
+        if (ParagonIE_Sodium_Core32_Ed25519::small_order($sig)) {
+            throw new SodiumException('Signature is on too small of an order');
+        }
+        if ((self::chrToInt($sig[63]) & 224) !== 0) {
+            throw new SodiumException('Invalid signature');
+        }
+        $d = 0;
+        for ($i = 0; $i < 32; ++$i) {
+            $d |= self::chrToInt($publicKey[$i]);
+        }
+        if ($d === 0) {
+            throw new SodiumException('All zero public key');
+        }
+
+        /** @var int|bool $size */
+        $size = filesize($filePath);
+        if (!is_int($size)) {
+            throw new SodiumException('Could not obtain the file size');
+        }
+        /** @var int $size */
+
+        /** @var resource|bool $fp */
+        $fp = fopen($filePath, 'rb');
+        if (!is_resource($fp)) {
+            throw new SodiumException('Could not open input file for reading');
+        }
+        /** @var resource $fp */
+
+        /** @var bool The original value of ParagonIE_Sodium_Compat::$fastMult */
+        $orig = ParagonIE_Sodium_Compat::$fastMult;
+
+        // Set ParagonIE_Sodium_Compat::$fastMult to true to speed up verification.
+        ParagonIE_Sodium_Compat::$fastMult = true;
+
+        /** @var ParagonIE_Sodium_Core32_Curve25519_Ge_P3 $A */
+        $A = ParagonIE_Sodium_Core32_Ed25519::ge_frombytes_negate_vartime($publicKey);
+
+        $hs = hash_init('sha512');
+        self::hash_update($hs, self::substr($sig, 0, 32));
+        self::hash_update($hs, self::substr($publicKey, 0, 32));
+        /** @var resource $hs */
+        $hs = self::updateHashWithFile($hs, $fp, $size);
+        /** @var string $hDigest */
+        $hDigest = hash_final($hs, true);
+
+        /** @var string $h */
+        $h = ParagonIE_Sodium_Core32_Ed25519::sc_reduce($hDigest) . self::substr($hDigest, 32);
+
+        /** @var ParagonIE_Sodium_Core32_Curve25519_Ge_P2 $R */
+        $R = ParagonIE_Sodium_Core32_Ed25519::ge_double_scalarmult_vartime(
+            $h,
+            $A,
+            self::substr($sig, 32)
+        );
+
+        /** @var string $rcheck */
+        $rcheck = ParagonIE_Sodium_Core32_Ed25519::ge_tobytes($R);
+
+        // Close the file handle
+        fclose($fp);
+
+        // Reset ParagonIE_Sodium_Compat::$fastMult to what it was before.
+        ParagonIE_Sodium_Compat::$fastMult = $orig;
+        return self::verify_32($rcheck, self::substr($sig, 0, 32));
+    }
+
+    /**
+     * Encrypt a file (32-bit)
+     *
+     * @param resource $ifp
+     * @param resource $ofp
+     * @param int $mlen
+     * @param string $nonce
+     * @param string $key
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    protected static function secretbox_encrypt_core32($ifp, $ofp, $mlen, $nonce, $key)
+    {
+        $plaintext = fread($ifp, 32);
+        if (!is_string($plaintext)) {
+            throw new SodiumException('Could not read input file');
+        }
+        $first32 = self::ftell($ifp);
+
+        /** @var string $subkey */
+        $subkey = ParagonIE_Sodium_Core32_HSalsa20::hsalsa20($nonce, $key);
+
+        /** @var string $realNonce */
+        $realNonce = ParagonIE_Sodium_Core32_Util::substr($nonce, 16, 8);
+
+        /** @var string $block0 */
+        $block0 = str_repeat("\x00", 32);
+
+        /** @var int $mlen - Length of the plaintext message */
+        $mlen0 = $mlen;
+        if ($mlen0 > 64 - ParagonIE_Sodium_Crypto::secretbox_xsalsa20poly1305_ZEROBYTES) {
+            $mlen0 = 64 - ParagonIE_Sodium_Crypto::secretbox_xsalsa20poly1305_ZEROBYTES;
+        }
+        $block0 .= ParagonIE_Sodium_Core32_Util::substr($plaintext, 0, $mlen0);
+
+        /** @var string $block0 */
+        $block0 = ParagonIE_Sodium_Core32_Salsa20::salsa20_xor(
+            $block0,
+            $realNonce,
+            $subkey
+        );
+
+        $state = new ParagonIE_Sodium_Core32_Poly1305_State(
+            ParagonIE_Sodium_Core32_Util::substr(
+                $block0,
+                0,
+                ParagonIE_Sodium_Crypto::onetimeauth_poly1305_KEYBYTES
+            )
+        );
+
+        // Pre-write 16 blank bytes for the Poly1305 tag
+        $start = self::ftell($ofp);
+        fwrite($ofp, str_repeat("\x00", 16));
+
+        /** @var string $c */
+        $cBlock = ParagonIE_Sodium_Core32_Util::substr(
+            $block0,
+            ParagonIE_Sodium_Crypto::secretbox_xsalsa20poly1305_ZEROBYTES
+        );
+        $state->update($cBlock);
+        fwrite($ofp, $cBlock);
+        $mlen -= 32;
+
+        /** @var int $iter */
+        $iter = 1;
+
+        /** @var int $incr */
+        $incr = self::BUFFER_SIZE >> 6;
+
+        /*
+         * Set the cursor to the end of the first half-block. All future bytes will
+         * generated from salsa20_xor_ic, starting from 1 (second block).
+         */
+        fseek($ifp, $first32, SEEK_SET);
+
+        while ($mlen > 0) {
+            $blockSize = $mlen > self::BUFFER_SIZE
+                ? self::BUFFER_SIZE
+                : $mlen;
+            $plaintext = fread($ifp, $blockSize);
+            if (!is_string($plaintext)) {
+                throw new SodiumException('Could not read input file');
+            }
+            $cBlock = ParagonIE_Sodium_Core32_Salsa20::salsa20_xor_ic(
+                $plaintext,
+                $realNonce,
+                $iter,
+                $subkey
+            );
+            fwrite($ofp, $cBlock, $blockSize);
+            $state->update($cBlock);
+
+            $mlen -= $blockSize;
+            $iter += $incr;
+        }
+        try {
+            ParagonIE_Sodium_Compat::memzero($block0);
+            ParagonIE_Sodium_Compat::memzero($subkey);
+        } catch (SodiumException $ex) {
+            $block0 = null;
+            $subkey = null;
+        }
+        $end = self::ftell($ofp);
+
+        /*
+         * Write the Poly1305 authentication tag that provides integrity
+         * over the ciphertext (encrypt-then-MAC)
+         */
+        fseek($ofp, $start, SEEK_SET);
+        fwrite($ofp, $state->finish(), ParagonIE_Sodium_Compat::CRYPTO_SECRETBOX_MACBYTES);
+        fseek($ofp, $end, SEEK_SET);
+        unset($state);
+
+        return true;
+    }
+
+    /**
+     * Decrypt a file (32-bit)
+     *
+     * @param resource $ifp
+     * @param resource $ofp
+     * @param int $mlen
+     * @param string $nonce
+     * @param string $key
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    protected static function secretbox_decrypt_core32($ifp, $ofp, $mlen, $nonce, $key)
+    {
+        $tag = fread($ifp, 16);
+        if (!is_string($tag)) {
+            throw new SodiumException('Could not read input file');
+        }
+
+        /** @var string $subkey */
+        $subkey = ParagonIE_Sodium_Core32_HSalsa20::hsalsa20($nonce, $key);
+
+        /** @var string $realNonce */
+        $realNonce = ParagonIE_Sodium_Core32_Util::substr($nonce, 16, 8);
+
+        /** @var string $block0 */
+        $block0 = ParagonIE_Sodium_Core32_Salsa20::salsa20(
+            64,
+            ParagonIE_Sodium_Core32_Util::substr($nonce, 16, 8),
+            $subkey
+        );
+
+        /* Verify the Poly1305 MAC -before- attempting to decrypt! */
+        $state = new ParagonIE_Sodium_Core32_Poly1305_State(self::substr($block0, 0, 32));
+        if (!self::onetimeauth_verify_core32($state, $ifp, $tag, $mlen)) {
+            throw new SodiumException('Invalid MAC');
+        }
+
+        /*
+         * Set the cursor to the end of the first half-block. All future bytes will
+         * generated from salsa20_xor_ic, starting from 1 (second block).
+         */
+        $first32 = fread($ifp, 32);
+        if (!is_string($first32)) {
+            throw new SodiumException('Could not read input file');
+        }
+        $first32len = self::strlen($first32);
+        fwrite(
+            $ofp,
+            self::xorStrings(
+                self::substr($block0, 32, $first32len),
+                self::substr($first32, 0, $first32len)
+            )
+        );
+        $mlen -= 32;
+
+        /** @var int $iter */
+        $iter = 1;
+
+        /** @var int $incr */
+        $incr = self::BUFFER_SIZE >> 6;
+
+        /* Decrypts ciphertext, writes to output file. */
+        while ($mlen > 0) {
+            $blockSize = $mlen > self::BUFFER_SIZE
+                ? self::BUFFER_SIZE
+                : $mlen;
+            $ciphertext = fread($ifp, $blockSize);
+            if (!is_string($ciphertext)) {
+                throw new SodiumException('Could not read input file');
+            }
+            $pBlock = ParagonIE_Sodium_Core32_Salsa20::salsa20_xor_ic(
+                $ciphertext,
+                $realNonce,
+                $iter,
+                $subkey
+            );
+            fwrite($ofp, $pBlock, $blockSize);
+            $mlen -= $blockSize;
+            $iter += $incr;
+        }
+        return true;
+    }
+
+    /**
+     * One-time message authentication for 32-bit systems
+     *
+     * @param ParagonIE_Sodium_Core32_Poly1305_State $state
+     * @param resource $ifp
+     * @param string $tag
+     * @param int $mlen
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    protected static function onetimeauth_verify_core32(
+        ParagonIE_Sodium_Core32_Poly1305_State $state,
+        $ifp,
+        $tag = '',
+        $mlen = 0
+    ) {
+        /** @var int $pos */
+        $pos = self::ftell($ifp);
+
+        while ($mlen > 0) {
+            $blockSize = $mlen > self::BUFFER_SIZE
+                ? self::BUFFER_SIZE
+                : $mlen;
+            $ciphertext = fread($ifp, $blockSize);
+            if (!is_string($ciphertext)) {
+                throw new SodiumException('Could not read input file');
+            }
+            $state->update($ciphertext);
+            $mlen -= $blockSize;
+        }
+        $res = ParagonIE_Sodium_Core32_Util::verify_16($tag, $state->finish());
+
+        fseek($ifp, $pos, SEEK_SET);
+        return $res;
+    }
+
+    /**
+     * @param resource $resource
+     * @return int
+     * @throws SodiumException
+     */
+    private static function ftell($resource)
+    {
+        $return = ftell($resource);
+        if (!is_int($return)) {
+            throw new SodiumException('ftell() returned false');
+        }
+        return (int) $return;
+    }
+}
diff --git a/vendor/paragonie/sodium_compat/src/PHP52/SplFixedArray.php b/vendor/paragonie/sodium_compat/src/PHP52/SplFixedArray.php
new file mode 100644
index 0000000..c333ad4
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/PHP52/SplFixedArray.php
@@ -0,0 +1,189 @@
+<?php
+
+if (class_exists('SplFixedArray')) {
+    return;
+}
+
+/**
+ * The SplFixedArray class provides the main functionalities of array. The
+ * main differences between a SplFixedArray and a normal PHP array is that
+ * the SplFixedArray is of fixed length and allows only integers within
+ * the range as indexes. The advantage is that it allows a faster array
+ * implementation.
+ */
+class SplFixedArray implements Iterator, ArrayAccess, Countable
+{
+    /** @var array<int, mixed> */
+    private $internalArray = array();
+
+    /** @var int $size */
+    private $size = 0;
+
+    /**
+     * SplFixedArray constructor.
+     * @param int $size
+     */
+    public function __construct($size = 0)
+    {
+        $this->size = $size;
+        $this->internalArray = array();
+    }
+
+    /**
+     * @return int
+     */
+    public function count()
+    {
+        return count($this->internalArray);
+    }
+
+    /**
+     * @return array
+     */
+    public function toArray()
+    {
+        ksort($this->internalArray);
+        return (array) $this->internalArray;
+    }
+
+    /**
+     * @param array $array
+     * @param bool $save_indexes
+     * @return SplFixedArray
+     * @psalm-suppress MixedAssignment
+     */
+    public static function fromArray(array $array, $save_indexes = true)
+    {
+        $self = new SplFixedArray(count($array));
+        if($save_indexes) {
+            foreach($array as $key => $value) {
+                $self[(int) $key] = $value;
+            }
+        } else {
+            $i = 0;
+            foreach (array_values($array) as $value) {
+                $self[$i] = $value;
+                $i++;
+            }
+        }
+        return $self;
+    }
+
+    /**
+     * @return int
+     */
+    public function getSize()
+    {
+        return $this->size;
+    }
+
+    /**
+     * @param int $size
+     * @return bool
+     */
+    public function setSize($size)
+    {
+        $this->size = $size;
+        return true;
+    }
+
+    /**
+     * @param string|int $index
+     * @return bool
+     */
+    public function offsetExists($index)
+    {
+        return array_key_exists((int) $index, $this->internalArray);
+    }
+
+    /**
+     * @param string|int $index
+     * @return mixed
+     */
+    public function offsetGet($index)
+    {
+        /** @psalm-suppress MixedReturnStatement */
+        return $this->internalArray[(int) $index];
+    }
+
+    /**
+     * @param string|int $index
+     * @param mixed $newval
+     * @psalm-suppress MixedAssignment
+     */
+    public function offsetSet($index, $newval)
+    {
+        $this->internalArray[(int) $index] = $newval;
+    }
+
+    /**
+     * @param string|int $index
+     */
+    public function offsetUnset($index)
+    {
+        unset($this->internalArray[(int) $index]);
+    }
+
+    /**
+     * Rewind iterator back to the start
+     * @link https://php.net/manual/en/splfixedarray.rewind.php
+     * @return void
+     * @since 5.3.0
+     */
+    public function rewind()
+    {
+        reset($this->internalArray);
+    }
+
+    /**
+     * Return current array entry
+     * @link https://php.net/manual/en/splfixedarray.current.php
+     * @return mixed The current element value.
+     * @since 5.3.0
+     */
+    public function current()
+    {
+        /** @psalm-suppress MixedReturnStatement */
+        return current($this->internalArray);
+    }
+
+    /**
+     * Return current array index
+     * @return int The current array index.
+     */
+    public function key()
+    {
+        return key($this->internalArray);
+    }
+
+    /**
+     * @return void
+     */
+    public function next()
+    {
+        next($this->internalArray);
+    }
+
+    /**
+     * Check whether the array contains more elements
+     * @link https://php.net/manual/en/splfixedarray.valid.php
+     * @return bool true if the array contains any more elements, false otherwise.
+     */
+    public function valid()
+    {
+        if (empty($this->internalArray)) {
+            return false;
+        }
+        $result = next($this->internalArray) !== false;
+        prev($this->internalArray);
+        return $result;
+    }
+
+    /**
+     * Do nothing.
+     */
+    public function __wakeup()
+    {
+        // NOP
+    }
+}
+\ No newline at end of file
diff --git a/vendor/paragonie/sodium_compat/src/SodiumException.php b/vendor/paragonie/sodium_compat/src/SodiumException.php
new file mode 100644
index 0000000..a3176d7
--- /dev/null
+++ b/vendor/paragonie/sodium_compat/src/SodiumException.php
@@ -0,0 +1,11 @@
+<?php
+
+if (!class_exists('SodiumException', false)) {
+    /**
+     * Class SodiumException
+     */
+    class SodiumException extends Exception
+    {
+
+    }
+}