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<?php declare(strict_types=1); namespace Jose\Component\Encryption\Algorithm\ContentEncryption; use Jose\Component\Core\Util\Base64UrlSafe; use Jose\Component\Encryption\Algorithm\ContentEncryptionAlgorithm; use RuntimeException; use function extension_loaded; use const OPENSSL_RAW_DATA; abstract class AESGCM implements ContentEncryptionAlgorithm { public function __construct() { if (! extension_loaded('openssl')) { throw new RuntimeException('Please install the OpenSSL extension'); } } public function allowedKeyTypes(): array { return []; //Irrelevant } public function encryptContent( string $data, string $cek, string $iv, ?string $aad, string $encoded_protected_header, ?string &$tag = null ): string { $calculated_aad = $encoded_protected_header; if ($aad !== null) { $calculated_aad .= '.' . Base64UrlSafe::encodeUnpadded($aad); } $tag = ''; $result = openssl_encrypt($data, $this->getMode(), $cek, OPENSSL_RAW_DATA, $iv, $tag, $calculated_aad); if ($result === false) { throw new RuntimeException('Unable to encrypt the content'); } return $result; } public function decryptContent( string $data, string $cek, string $iv, ?string $aad, string $encoded_protected_header, string $tag ): string { $calculated_aad = $encoded_protected_header; if ($aad !== null) { $calculated_aad .= '.' . Base64UrlSafe::encodeUnpadded($aad); } $result = openssl_decrypt($data, $this->getMode(), $cek, OPENSSL_RAW_DATA, $iv, $tag, $calculated_aad); if ($result === false) { throw new RuntimeException('Unable to decrypt the content'); } return $result; } public function getIVSize(): int { return 96; } abstract protected function getMode(): string; }
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