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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 5 |
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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 $algo Hashing algorithm to use for internal operations |
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* |
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* @return string |
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*/ |
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protected static function checksum($cyphertext, $iv, $key, $cipher = 'rijndael-128', $mode = 'cbc', $algo = 'sha256') |
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{ |
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// Prevent potentially large string concat by hmac-ing the cyphertext |
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// by itself... |
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$sum = \hash_hmac($algo, $cyphertext, $key, true); |
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// ... then hash other elements with previous hmac and return |
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return \hash_hmac($algo, $sum . $iv . $mode . $cipher, $key, true); |
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} |
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/** |
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* This will normalize a hash to a certain length by extending it if |
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* too short and truncating it if too long. This ensures that any |
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* hash algo will work with any combination of other settings. However, |
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* it is probably best to make sure that the keysize and algo size |
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* are identical so that the input hash passes through unchanged. |
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* |
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* @param string $hash Hash to be normalized |
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* @param int $size Size of the desired output hash, in bytes |
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* @param string $algo Hashing algorithm to use for internal operations |
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* |
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* @return string |
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*/ |
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private static function hashNormalize($hash, $size, $algo) |
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{ |
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// Extend hash if too short |
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while (Str::strlen($hash) < $size) { |
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$hash .= \hash($algo, $hash, true); |
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} |
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// Truncate to specified number of bytes (if needed) and return |
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return Str::substr($hash, 0, $size); |
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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 $algo Hashing algorithm to use for internal operations |
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* |
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* @return string |
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*/ |
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protected static function key($password, $iv, $cost, $cipher = 'rijndael-128', $mode = 'cbc', $algo = 'sha256') |
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{ |
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// This if statement allows the usage of the Openssl library without |
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// the need to have the mcrypt plugin installed at all. |
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if ($cipher === Aes::RIJNDA) { |
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$keysize = 32; |
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} else { |
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$keysize = \mcrypt_get_key_size($cipher, $mode); |
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} |
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// Perform key derivation |
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$key = Hash::ihmac($iv . $cipher . $mode, $password, $cost, $algo); |
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// Return hash normalized to key length |
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return self::hashNormalize($key, $keysize, $algo); |
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} |
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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 $supplied |
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*/ |
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protected static function checksumVerify($calculated, $supplied) |
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{ |
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if (!Str::equal($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
