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<?php |
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/* |
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* The MIT License (MIT) |
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* |
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* Copyright (c) 2014-2016 Spomky-Labs |
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* |
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* This software may be modified and distributed under the terms |
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* of the MIT license. See the LICENSE file for details. |
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*/ |
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namespace Jose\Algorithm\ContentEncryption; |
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use AESGCM\AESGCM as GCM; |
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use Crypto\Cipher; |
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use Jose\Algorithm\ContentEncryptionAlgorithmInterface; |
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abstract class AESGCM implements ContentEncryptionAlgorithmInterface |
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{ |
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/** |
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* {@inheritdoc} |
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*/ |
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public function encryptContent($data, $cek, $iv, $aad, $encoded_protected_header, &$tag) |
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{ |
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$calculated_aad = $encoded_protected_header; |
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if (null !== $aad) { |
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$calculated_aad .= '.'.$aad; |
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} |
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list($cyphertext, $tag) = GCM::encrypt($cek, $iv, $data, $calculated_aad); |
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return $cyphertext; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function decryptContent($data, $cek, $iv, $aad, $encoded_protected_header, $tag) |
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{ |
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$calculated_aad = $encoded_protected_header; |
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if (null !== $aad) { |
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$calculated_aad .= '.'.$aad; |
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} |
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if (version_compare(PHP_VERSION, '7.1.0') >= 0) { |
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return openssl_decrypt($data, $this->getMode($cek), $cek, OPENSSL_RAW_DATA, $iv, $tag, $calculated_aad); |
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} elseif (class_exists('\Crypto\Cipher')) { |
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$cipher = Cipher::aes(Cipher::MODE_GCM, $this->getKeySize()); |
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$cipher->setTag($tag); |
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$cipher->setAAD($calculated_aad); |
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$plaintext = $cipher->decrypt($data, $cek, $iv); |
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return $plaintext; |
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} |
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return GCM::decrypt($cek, $iv, $data, $calculated_aad, $tag); |
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} |
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/** |
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* @param string $k |
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* |
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* @return string |
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*/ |
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private function getMode($k) |
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{ |
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return 'aes-'.(8 * mb_strlen($k, '8bit')).'-gcm'; |
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} |
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/** |
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* @return int |
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*/ |
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public function getIVSize() |
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{ |
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return 96; |
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} |
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/** |
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* @return int |
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*/ |
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public function getCEKSize() |
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{ |
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return $this->getKeySize(); |
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} |
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/** |
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* @return int |
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*/ |
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abstract protected function getKeySize(); |
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} |
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Spomky-Labs /
jose
