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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 Jose\Algorithm\ContentEncryptionAlgorithmInterface; |
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/** |
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* |
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*/ |
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abstract class AESCBCHS 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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$k = substr($cek, strlen($cek) / 2); |
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$cyphertext = openssl_encrypt($data, $this->getMode($k), $k, OPENSSL_RAW_DATA, $iv); |
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$tag = $this->calculateAuthenticationTag($cyphertext, $cek, $iv, $aad, $encoded_protected_header); |
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return $cyphertext; |
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} |
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/** |
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* @param string $data |
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* @param string $cek |
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* @param string $iv |
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* @param string $aad |
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* @param string $encoded_protected_header |
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* @param string|null $aad |
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* @param string $tag |
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* |
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* @return string |
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*/ |
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public function decryptContent($data, $cek, $iv, $aad, $encoded_protected_header, $tag) |
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{ |
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if (false === $this->checkAuthenticationTag($data, $cek, $iv, $aad, $encoded_protected_header, $tag)) { |
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return; |
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} |
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$k = substr($cek, strlen($cek) / 2); |
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return openssl_decrypt($data, self::getMode($k), $k, OPENSSL_RAW_DATA, $iv); |
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} |
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/** |
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* @param $encrypted_data |
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* @param $cek |
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* @param $iv |
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* @param $aad |
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* @param string $encoded_header |
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* |
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* @return string |
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*/ |
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protected function calculateAuthenticationTag($encrypted_data, $cek, $iv, $aad, $encoded_header) |
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{ |
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$calculated_aad = $encoded_header; |
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if (null !== $aad) { |
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$calculated_aad .= '.'.$aad; |
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} |
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$mac_key = substr($cek, 0, strlen($cek) / 2); |
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$auth_data_length = strlen($encoded_header); |
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$secured_input = implode('', [ |
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$calculated_aad, |
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$iv, |
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$encrypted_data, |
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pack('N2', ($auth_data_length / 2147483647) * 8, ($auth_data_length % 2147483647) * 8), // str_pad(dechex($auth_data_length), 4, "0", STR_PAD_LEFT) |
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]); |
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$hash = hash_hmac($this->getHashAlgorithm(), $secured_input, $mac_key, true); |
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return substr($hash, 0, strlen($hash) / 2); |
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} |
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/** |
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* @param string $authentication_tag |
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* @param string $encoded_header |
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* @param string $encrypted_data |
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* @param string $cek |
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* @param string $iv |
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* @param string|null $aad |
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* |
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* @return bool |
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*/ |
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protected function checkAuthenticationTag($encrypted_data, $cek, $iv, $aad, $encoded_header, $authentication_tag) |
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{ |
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return $authentication_tag === $this->calculateAuthenticationTag($encrypted_data, $cek, $iv, $aad, $encoded_header); |
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} |
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/** |
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* @return string |
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*/ |
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abstract protected function getHashAlgorithm(); |
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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 128; |
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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 * strlen($k)).'-cbc'; |
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} |
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} |
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Spomky-Labs /
jose
