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<?php |
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declare(strict_types = 1); |
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namespace Sop\JWX\JWE\KeyAlgorithm; |
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use Sop\JWX\JWA\JWA; |
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use Sop\JWX\JWE\KeyManagementAlgorithm; |
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use Sop\JWX\JWK\JWK; |
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use Sop\JWX\JWK\JWKSet; |
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use Sop\JWX\JWT\Header\Header; |
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/** |
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* Factory class to construct key management algorithm instances. |
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*/ |
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class KeyAlgorithmFactory |
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{ |
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/** |
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* Mapping from algorithm name to class name. |
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* |
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* @internal |
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* |
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* @var array |
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*/ |
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public const MAP_ALGO_TO_CLASS = [ |
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JWA::ALGO_A128KW => A128KWAlgorithm::class, |
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JWA::ALGO_A192KW => A192KWAlgorithm::class, |
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JWA::ALGO_A128KW => A256KWAlgorithm::class, |
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JWA::ALGO_A128GCMKW => A128GCMKWAlgorithm::class, |
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JWA::ALGO_A192GCMKW => A192GCMKWAlgorithm::class, |
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JWA::ALGO_A256GCMKW => A256GCMKWAlgorithm::class, |
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JWA::ALGO_PBES2_HS256_A128KW => PBES2HS256A128KWAlgorithm::class, |
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JWA::ALGO_PBES2_HS384_A192KW => PBES2HS384A192KWAlgorithm::class, |
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JWA::ALGO_PBES2_HS512_A256KW => PBES2HS512A256KWAlgorithm::class, |
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JWA::ALGO_DIR => DirectCEKAlgorithm::class, |
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JWA::ALGO_RSA1_5 => RSAESPKCS1Algorithm::class, |
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JWA::ALGO_RSA_OAEP => RSAESOAEPAlgorithm::class, |
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]; |
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/** |
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* Header. |
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* |
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* @var Header |
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*/ |
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protected $_header; |
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/** |
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* Constructor. |
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*/ |
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public function __construct(Header $header) |
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{ |
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$this->_header = $header; |
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} |
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/** |
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* Get key management algorithm by given JWK. |
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*/ |
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public function algoByKey(JWK $jwk): KeyManagementAlgorithm |
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{ |
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$alg = JWA::deriveAlgorithmName($this->_header, $jwk); |
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$cls = self::_algoClassByName($alg); |
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return $cls::fromJWK($jwk, $this->_header); |
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} |
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/** |
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* Get key management algorithm using a matching key from given JWK set. |
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* |
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* @throws \UnexpectedValueException If a key cannot be found |
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*/ |
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public function algoByKeys(JWKSet $set): KeyManagementAlgorithm |
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{ |
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if (!$this->_header->hasKeyID()) { |
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throw new \UnexpectedValueException('No key ID paremeter.'); |
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} |
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$id = $this->_header->keyID()->value(); |
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if (!$set->hasKeyID($id)) { |
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throw new \UnexpectedValueException("No key for ID '{$id}'."); |
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} |
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return $this->algoByKey($set->keyByID($id)); |
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} |
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/** |
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* Get the algorithm implementation class name by an algorithm name. |
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* |
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* @param string $alg Algorithm name |
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* |
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* @throws \UnexpectedValueException |
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* |
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* @return string Class name |
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*/ |
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private static function _algoClassByName(string $alg): string |
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{ |
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if (!array_key_exists($alg, self::MAP_ALGO_TO_CLASS)) { |
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throw new \UnexpectedValueException( |
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"Algorithm '{$alg}' not supported."); |
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} |
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return self::MAP_ALGO_TO_CLASS[$alg]; |
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} |
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} |
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sop /
jwx
