diff options
Diffstat (limited to 'vendor/web-token/jwt-key-mgmt/KeyConverter/ECKey.php')
| -rw-r--r-- | vendor/web-token/jwt-key-mgmt/KeyConverter/ECKey.php | 273 |
1 files changed, 273 insertions, 0 deletions
diff --git a/vendor/web-token/jwt-key-mgmt/KeyConverter/ECKey.php b/vendor/web-token/jwt-key-mgmt/KeyConverter/ECKey.php new file mode 100644 index 0000000..4ab0090 --- /dev/null +++ b/vendor/web-token/jwt-key-mgmt/KeyConverter/ECKey.php @@ -0,0 +1,273 @@ +<?php + +declare(strict_types=1); + +/* + * The MIT License (MIT) + * + * Copyright (c) 2014-2018 Spomky-Labs + * + * This software may be modified and distributed under the terms + * of the MIT license. See the LICENSE file for details. + */ + +namespace Jose\Component\KeyManagement\KeyConverter; + +use Base64Url\Base64Url; +use FG\ASN1\ASNObject; +use FG\ASN1\ExplicitlyTaggedObject; +use FG\ASN1\Universal\BitString; +use FG\ASN1\Universal\Integer; +use FG\ASN1\Universal\ObjectIdentifier; +use FG\ASN1\Universal\OctetString; +use FG\ASN1\Universal\Sequence; + +/** + * @internal + */ +class ECKey +{ + /** + * @var array + */ + private $values = []; + + /** + * ECKey constructor. + */ + private function __construct(array $data) + { + $this->loadJWK($data); + } + + /** + * @return ECKey + */ + public static function createFromPEM(string $pem): self + { + $data = self::loadPEM($pem); + + return new self($data); + } + + /** + * @throws \Exception + */ + private static function loadPEM(string $data): array + { + $data = \base64_decode(\preg_replace('#-.*-|\r|\n#', '', $data), true); + $asnObject = ASNObject::fromBinary($data); + + if (!$asnObject instanceof Sequence) { + throw new \InvalidArgumentException('Unable to load the key.'); + } + $children = $asnObject->getChildren(); + if (self::isPKCS8($children)) { + $children = self::loadPKCS8($children); + } + + if (4 === \count($children)) { + return self::loadPrivatePEM($children); + } + if (2 === \count($children)) { + return self::loadPublicPEM($children); + } + + throw new \Exception('Unable to load the key.'); + } + + /** + * @param ASNObject[] $children + */ + private static function loadPKCS8(array $children): array + { + $binary = \hex2bin($children[2]->getContent()); + $asnObject = ASNObject::fromBinary($binary); + if (!$asnObject instanceof Sequence) { + throw new \InvalidArgumentException('Unable to load the key.'); + } + + return $asnObject->getChildren(); + } + + /** + * @param ASNObject[] $children + */ + private static function loadPublicPEM(array $children): array + { + if (!$children[0] instanceof Sequence) { + throw new \InvalidArgumentException('Unsupported key type.'); + } + + $sub = $children[0]->getChildren(); + if (!$sub[0] instanceof ObjectIdentifier) { + throw new \InvalidArgumentException('Unsupported key type.'); + } + if ('1.2.840.10045.2.1' !== $sub[0]->getContent()) { + throw new \InvalidArgumentException('Unsupported key type.'); + } + if (!$sub[1] instanceof ObjectIdentifier) { + throw new \InvalidArgumentException('Unsupported key type.'); + } + if (!$children[1] instanceof BitString) { + throw new \InvalidArgumentException('Unable to load the key.'); + } + + $bits = $children[1]->getContent(); + $bits_length = \mb_strlen($bits, '8bit'); + if ('04' !== \mb_substr($bits, 0, 2, '8bit')) { + throw new \InvalidArgumentException('Unsupported key type'); + } + + $values = ['kty' => 'EC']; + $values['crv'] = self::getCurve($sub[1]->getContent()); + $values['x'] = Base64Url::encode(\hex2bin(\mb_substr($bits, 2, ($bits_length - 2) / 2, '8bit'))); + $values['y'] = Base64Url::encode(\hex2bin(\mb_substr($bits, ($bits_length - 2) / 2 + 2, ($bits_length - 2) / 2, '8bit'))); + + return $values; + } + + private static function getCurve(string $oid): string + { + $curves = self::getSupportedCurves(); + $curve = \array_search($oid, $curves, true); + if (!\is_string($curve)) { + throw new \InvalidArgumentException('Unsupported OID.'); + } + + return $curve; + } + + private static function getSupportedCurves(): array + { + return [ + 'P-256' => '1.2.840.10045.3.1.7', + 'P-384' => '1.3.132.0.34', + 'P-521' => '1.3.132.0.35', + ]; + } + + private static function verifyVersion(ASNObject $children) + { + if (!$children instanceof Integer || '1' !== $children->getContent()) { + throw new \InvalidArgumentException('Unable to load the key.'); + } + } + + private static function getXAndY(ASNObject $children, ?string &$x, ?string &$y) + { + if (!$children instanceof ExplicitlyTaggedObject || !\is_array($children->getContent())) { + throw new \InvalidArgumentException('Unable to load the key.'); + } + if (!$children->getContent()[0] instanceof BitString) { + throw new \InvalidArgumentException('Unable to load the key.'); + } + + $bits = $children->getContent()[0]->getContent(); + $bits_length = \mb_strlen($bits, '8bit'); + + if ('04' !== \mb_substr($bits, 0, 2, '8bit')) { + throw new \InvalidArgumentException('Unsupported key type'); + } + + $x = \mb_substr($bits, 2, ($bits_length - 2) / 2, '8bit'); + $y = \mb_substr($bits, ($bits_length - 2) / 2 + 2, ($bits_length - 2) / 2, '8bit'); + } + + private static function getD(ASNObject $children): string + { + if (!$children instanceof OctetString) { + throw new \InvalidArgumentException('Unable to load the key.'); + } + + return $children->getContent(); + } + + private static function loadPrivatePEM(array $children): array + { + self::verifyVersion($children[0]); + $x = null; + $y = null; + $d = self::getD($children[1]); + self::getXAndY($children[3], $x, $y); + + if (!$children[2] instanceof ExplicitlyTaggedObject || !\is_array($children[2]->getContent())) { + throw new \InvalidArgumentException('Unable to load the key.'); + } + if (!$children[2]->getContent()[0] instanceof ObjectIdentifier) { + throw new \InvalidArgumentException('Unable to load the key.'); + } + + $curve = $children[2]->getContent()[0]->getContent(); + + $values = ['kty' => 'EC']; + $values['crv'] = self::getCurve($curve); + $values['d'] = Base64Url::encode(\hex2bin($d)); + $values['x'] = Base64Url::encode(\hex2bin($x)); + $values['y'] = Base64Url::encode(\hex2bin($y)); + + return $values; + } + + /** + * @param ASNObject[] $children + */ + private static function isPKCS8(array $children): bool + { + if (3 !== \count($children)) { + return false; + } + + $classes = [0 => Integer::class, 1 => Sequence::class, 2 => OctetString::class]; + foreach ($classes as $k => $class) { + if (!$children[$k] instanceof $class) { + return false; + } + } + + return true; + } + + /** + * @param ECKey $private + * + * @return ECKey + */ + public static function toPublic(self $private): self + { + $data = $private->toArray(); + if (\array_key_exists('d', $data)) { + unset($data['d']); + } + + return new self($data); + } + + /** + * @return array + */ + public function toArray() + { + return $this->values; + } + + private function loadJWK(array $jwk) + { + $keys = [ + 'kty' => 'The key parameter "kty" is missing.', + 'crv' => 'Curve parameter is missing', + 'x' => 'Point parameters are missing.', + 'y' => 'Point parameters are missing.', + ]; + foreach ($keys as $k => $v) { + if (!\array_key_exists($k, $jwk)) { + throw new \InvalidArgumentException($v); + } + } + + if ('EC' !== $jwk['kty']) { + throw new \InvalidArgumentException('JWK is not an Elliptic Curve key.'); + } + $this->values = $jwk; + } +} |