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<?php declare(strict_types=1); namespace Jose\Component\Encryption\Algorithm\KeyEncryption; use AESKW\Wrapper as WrapperInterface; use InvalidArgumentException; use Jose\Component\Core\JWK; use Jose\Component\Core\Util\Base64UrlSafe; use RuntimeException; use function in_array; use function is_string; abstract class AESKW implements KeyWrapping { public function __construct() { if (! interface_exists(WrapperInterface::class)) { throw new RuntimeException('Please install "spomky-labs/aes-key-wrap" to use AES-KW algorithms'); } } public function allowedKeyTypes(): array { return ['oct']; } /** * @param array<string, mixed> $completeHeader * @param array<string, mixed> $additionalHeader */ public function wrapKey(JWK $key, string $cek, array $completeHeader, array &$additionalHeader): string { $k = $this->getKey($key); $wrapper = $this->getWrapper(); return $wrapper::wrap($k, $cek); } /** * @param array<string, mixed> $completeHeader */ public function unwrapKey(JWK $key, string $encrypted_cek, array $completeHeader): string { $k = $this->getKey($key); $wrapper = $this->getWrapper(); return $wrapper::unwrap($k, $encrypted_cek); } public function getKeyManagementMode(): string { return self::MODE_WRAP; } abstract protected function getWrapper(): WrapperInterface; private function getKey(JWK $key): string { if (! in_array($key->get('kty'), $this->allowedKeyTypes(), true)) { throw new InvalidArgumentException('Wrong key type.'); } if (! $key->has('k')) { throw new InvalidArgumentException('The key parameter "k" is missing.'); } $k = $key->get('k'); if (! is_string($k)) { throw new InvalidArgumentException('The key parameter "k" is invalid.'); } return Base64UrlSafe::decodeNoPadding($k); } }
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