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<?php |
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/** |
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* Cryptobase.php |
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* |
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* PHP version 7 |
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* |
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* @category Dcrypt |
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* @package Dcrypt |
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* @author Michael Meyer (mmeyer2k) <[email protected]> |
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* @license http://opensource.org/licenses/MIT The MIT License (MIT) |
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* @link https://github.com/mmeyer2k/dcrypt |
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*/ |
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namespace Dcrypt; |
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/** |
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* Provides functionality common to Dcrypt's block ciphers. |
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* |
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* @category Dcrypt |
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* @package Dcrypt |
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* @author Michael Meyer (mmeyer2k) <[email protected]> |
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* @license http://opensource.org/licenses/MIT The MIT License (MIT) |
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* @link https://github.com/mmeyer2k/dcrypt |
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* @link https://apigen.ci/github/mmeyer2k/dcrypt/namespace-Dcrypt.html |
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*/ |
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class Cryptobase |
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{ |
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/** |
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* Create a message authentication checksum. |
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* |
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* @param string $cyphertext Cyphertext that needs a checksum. |
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* @param string $iv Initialization vector. |
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* @param string $key HMAC key |
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* @param string $cipher Cipher string |
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* @param string $mode Cipher mode string |
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* @param string $algo Hashing algorithm to use for internal operations |
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* |
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* @return string |
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*/ |
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protected static function checksum(string $cyphertext, string $iv, string $key, string $cipher = 'rijndael-128', string $mode = 'cbc', string $algo = 'sha256'): string |
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{ |
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// Prevent potentially large string concat by hmac-ing the cyphertext |
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// by itself... |
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$sum = \hash_hmac($algo, $cyphertext, $key, true); |
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// If algo is unknown, throw an exception |
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if ($sum === false) { |
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throw new \exception("$algo is not supported by hash_hmac"); // @codeCoverageIgnore |
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} |
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// ... then hash other elements with previous hmac and return |
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return \hash_hmac($algo, $sum . $iv . $mode . $cipher, $key, true); |
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} |
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/** |
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* Transform password into key and perform iterative HMAC (if specified) |
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* |
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* @param string $password Encryption key |
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* @param string $iv Initialization vector |
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* @param int $cost Number of HMAC iterations to perform on key |
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* @param string $cipher Mcrypt cipher |
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* @param string $mode Mcrypt block mode |
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* @param string $algo Hashing algorithm to use for internal operations |
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* |
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* @return string |
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*/ |
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protected static function key(string $password, string $iv, int $cost, string $cipher = 'rijndael-128', string $mode = 'cbc', string $algo = 'sha256'): string |
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{ |
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// Perform key derivation |
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return Hash::ihmac($iv . $cipher . $mode, $password, $cost, $algo); |
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} |
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1 |
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/** |
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* Verify checksum during decryption step and throw error if mismatching. |
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* |
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* @param string $calculated |
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* @param string $supplied |
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*/ |
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protected static function checksumVerify(string $calculated, string $supplied) |
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{ |
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if (!Str::equal($calculated, $supplied)) { |
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$e = 'Decryption can not proceed due to invalid cyphertext checksum.'; |
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throw new \InvalidArgumentException($e); |
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} |
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} |
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} |
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mmeyer2k /
dcrypt
