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<?php |
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declare(strict_types=1); |
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/* |
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* The MIT License (MIT) |
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* |
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* Copyright (c) 2014-2017 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\Component\Encryption\Algorithm\ContentEncryption; |
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use Jose\Component\Encryption\Algorithm\ContentEncryptionAlgorithmInterface; |
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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(string $data, string $cek, string $iv, ?string $aad, string $encoded_protected_header, ?string &$tag): string |
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{ |
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$keyLength = mb_strlen($cek, '8bit'); |
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$this->checkKeyLength($keyLength); |
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$k = mb_substr($cek, $keyLength / 2, null, '8bit'); |
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$cyphertext = openssl_encrypt($data, $this->getMode($keyLength), $k, OPENSSL_RAW_DATA, $iv); |
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if (false === $cyphertext) { |
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throw new \RuntimeException('Unable to encrypt.'); |
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} |
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$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(string $data, string $cek, string $iv, ?string $aad, string $encoded_protected_header, string $tag): string |
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{ |
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$keyLength = mb_strlen($cek, '8bit'); |
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$this->checkKeyLength($keyLength); |
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if (!$this->isTagValid($data, $cek, $iv, $aad, $encoded_protected_header, $tag)) { |
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throw new \InvalidArgumentException('Unable to verify the tag.'); |
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} |
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$k = mb_substr($cek, $keyLength / 2, null, '8bit'); |
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$plaintext = openssl_decrypt($data, self::getMode($keyLength), $k, OPENSSL_RAW_DATA, $iv); |
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if (false === $plaintext) { |
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throw new \RuntimeException('Unable to decrypt.'); |
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} |
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return $plaintext; |
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} |
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/** |
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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 null|string $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(string $encrypted_data, string $cek, string $iv, ?string $aad, string $encoded_header): string |
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{ |
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$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 = mb_substr($cek, 0, mb_strlen($cek, '8bit') / 2, '8bit'); |
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$auth_data_length = mb_strlen($encoded_header, '8bit'); |
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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, $mac_key, true); |
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return mb_substr($hash, 0, mb_strlen($hash, '8bit') / 2, '8bit'); |
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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 isTagValid(string $encrypted_data, string $cek, string $iv, ?string $aad, string $encoded_header, string $authentication_tag): bool |
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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(): string; |
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/** |
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* @return int |
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*/ |
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public function getIVSize(): int |
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{ |
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return 128; |
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} |
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/** |
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* @param int $keyLength |
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* |
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* @return string |
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*/ |
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private function getMode(int $keyLength): string |
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{ |
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return sprintf('aes-%d-cbc', 8 * $keyLength/2); |
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} |
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/** |
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* @param int $keyLength |
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*/ |
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private function checkKeyLength(int $keyLength) |
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{ |
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if (!in_array($keyLength, [32, 48, 64])) { |
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throw new \InvalidArgumentException('Invalid key length. Allowed sizes are 256, 384 and 512 bits.'); |
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} |
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} |
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} |
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Spomky-Labs /
jose
