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<?php /** * Generate a PBKDF2 key derivation of a supplied password * * This is a hash_pbkdf2() implementation for PHP versions 5.3 and 5.4. * @link http://www.php.net/manual/en/function.hash-pbkdf2.php * * @param string $algo * @param string $password * @param string $salt * @param int $iterations * @param int $length * @param bool $rawOutput * * @return string */ function compat_pbkdf2($algo, $password, $salt, $iterations, $length = 0, $rawOutput = false) { // check for hashing algorithm if (!in_array(strtolower($algo), hash_algos())) { trigger_error(sprintf( '%s(): Unknown hashing algorithm: %s', __FUNCTION__, $algo ), E_USER_WARNING); return false; } // check for type of iterations and length foreach (array(4 => $iterations, 5 => $length) as $index => $value) { if (!is_numeric($value)) { trigger_error(sprintf( '%s() expects parameter %d to be long, %s given', __FUNCTION__, $index, gettype($value) ), E_USER_WARNING); return null; } } // check iterations $iterations = (int)$iterations; if ($iterations <= 0) { trigger_error(sprintf( '%s(): Iterations must be a positive integer: %d', __FUNCTION__, $iterations ), E_USER_WARNING); return false; } // check length $length = (int)$length; if ($length < 0) { trigger_error(sprintf( '%s(): Iterations must be greater than or equal to 0: %d', __FUNCTION__, $length ), E_USER_WARNING); return false; } // check salt if (strlen($salt) > PHP_INT_MAX - 4) { trigger_error(sprintf( '%s(): Supplied salt is too long, max of INT_MAX - 4 bytes: %d supplied', __FUNCTION__, strlen($salt) ), E_USER_WARNING); return false; } // initialize $derivedKey = ''; $loops = 1; if ($length > 0) { $loops = (int)ceil($length / strlen(hash($algo, '', $rawOutput))); } // hash for each blocks for ($i = 1; $i <= $loops; $i++) { $digest = hash_hmac($algo, $salt . pack('N', $i), $password, true); $block = $digest; for ($j = 1; $j < $iterations; $j++) { $digest = hash_hmac($algo, $digest, $password, true); $block ^= $digest; } $derivedKey .= $block; } if (!$rawOutput) { $derivedKey = bin2hex($derivedKey); } if ($length > 0) { return substr($derivedKey, 0, $length); } return $derivedKey; } // test hash_pbkdf2("sha256", "!Password@123#", 'pCtRL7cHbJR-6Px1g5(&o&O(2Kj_pdbC', 1000, 64); compat_pbkdf2("sha256", "!Password@123#", 'pCtRL7cHbJR-6Px1g5(&o&O(2Kj_pdbC', 1000, 64);