1 files changed, 88 insertions, 0 deletions
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/BitString.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/BitString.php
new file mode 100644
index 0000000..226695c
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/BitString.php
@@ -0,0 +1,88 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use Exception;
+use FG\ASN1\Exception\ParserException;
+use FG\ASN1\Parsable;
+use FG\ASN1\Identifier;
+
+class BitString extends OctetString implements Parsable
+{
+    private $nrOfUnusedBits;
+
+    /**
+     * Creates a new ASN.1 BitString object.
+     *
+     * @param string|int $value Either the hexadecimal value as a string (spaces are allowed - leading 0x is optional) or a numeric value
+     * @param int $nrOfUnusedBits the number of unused bits in the last octet [optional].
+     *
+     * @throws Exception if the second parameter is no positive numeric value
+     */
+    public function __construct($value, $nrOfUnusedBits = 0)
+    {
+        parent::__construct($value);
+
+        if (!is_numeric($nrOfUnusedBits) || $nrOfUnusedBits < 0) {
+            throw new Exception('BitString: second parameter needs to be a positive number (or zero)!');
+        }
+
+        $this->nrOfUnusedBits = $nrOfUnusedBits;
+    }
+
+    public function getType()
+    {
+        return Identifier::BITSTRING;
+    }
+
+    protected function calculateContentLength()
+    {
+        // add one to the length for the first octet which encodes the number of unused bits in the last octet
+        return parent::calculateContentLength() + 1;
+    }
+
+    protected function getEncodedValue()
+    {
+        // the first octet determines the number of unused bits
+        $nrOfUnusedBitsOctet = chr($this->nrOfUnusedBits);
+        $actualContent = parent::getEncodedValue();
+
+        return $nrOfUnusedBitsOctet.$actualContent;
+    }
+
+    public function getNumberOfUnusedBits()
+    {
+        return $this->nrOfUnusedBits;
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        self::parseIdentifier($binaryData[$offsetIndex], Identifier::BITSTRING, $offsetIndex++);
+        $contentLength = self::parseContentLength($binaryData, $offsetIndex, 2);
+
+        $nrOfUnusedBits = ord($binaryData[$offsetIndex]);
+        $value = substr($binaryData, $offsetIndex + 1, $contentLength - 1);
+
+        if ($nrOfUnusedBits > 7 || // no less than 1 used, otherwise non-minimal
+            ($contentLength - 1) == 1 && $nrOfUnusedBits > 0 || // content length only 1, no
+            (ord($value[strlen($value)-1])&((1<<$nrOfUnusedBits)-1)) != 0 // unused bits set
+        ) {
+            throw new ParserException("Can not parse bit string with invalid padding", $offsetIndex);
+        }
+
+        $offsetIndex += $contentLength;
+
+        $parsedObject = new self(bin2hex($value), $nrOfUnusedBits);
+        $parsedObject->setContentLength($contentLength);
+
+        return $parsedObject;
+    }
+}