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<?php |
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declare(strict_types = 1); |
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namespace Sop\JWX\JWE\EncryptionAlgorithm; |
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use Sop\JWX\JWA\JWA; |
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use Sop\JWX\JWE\ContentEncryptionAlgorithm; |
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use Sop\JWX\JWT\Header\Header; |
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/** |
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* Factory class to construct content encryption algorithm instances. |
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*/ |
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abstract class EncryptionAlgorithmFactory |
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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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const MAP_ALGO_TO_CLASS = [ |
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JWA::ALGO_A128CBC_HS256 => A128CBCHS256Algorithm::class, |
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JWA::ALGO_A192CBC_HS384 => A192CBCHS384Algorithm::class, |
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JWA::ALGO_A256CBC_HS512 => A256CBCHS512Algorithm::class, |
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JWA::ALGO_A128GCM => A128GCMAlgorithm::class, |
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JWA::ALGO_A192GCM => A192GCMAlgorithm::class, |
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JWA::ALGO_A256GCM => A256GCMAlgorithm::class, |
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]; |
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/** |
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* Get the content encryption algorithm by algorithm name. |
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* |
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* @param string $name Algorithm name |
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* |
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* @throws \UnexpectedValueException if algorithm is not supported |
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* |
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* @return ContentEncryptionAlgorithm |
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*/ |
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public static function algoByName(string $name): ContentEncryptionAlgorithm |
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{ |
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if (!array_key_exists($name, self::MAP_ALGO_TO_CLASS)) { |
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throw new \UnexpectedValueException( |
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"No content encryption algorithm '{$name}'."); |
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} |
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$cls = self::MAP_ALGO_TO_CLASS[$name]; |
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return new $cls(); |
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} |
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/** |
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* Get the content encryption algorithm as specified in the given header. |
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* |
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* @param Header $header Header |
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* |
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* @throws \UnexpectedValueException If content encryption algorithm |
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* parameter is not present or algorithm |
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* is not supported |
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* |
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* @return ContentEncryptionAlgorithm |
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*/ |
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public static function algoByHeader(Header $header): ContentEncryptionAlgorithm |
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{ |
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if (!$header->hasEncryptionAlgorithm()) { |
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throw new \UnexpectedValueException( |
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'No encryption algorithm parameter.'); |
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} |
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return self::algoByName($header->encryptionAlgorithm()->value()); |
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} |
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} |
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sop /
jwx
