5 // Import framework stuff
6 use CoreFramework\Bootstrap\FrameworkBootstrap;
7 use CoreFramework\Object\BaseFrameworkSystem;
10 * This file contains a 'core-d' version of the example helper classes for the
11 * php-scrypt extension. It has been renamed from scrypt.php to this name so the
12 * framework can easily find it. Also it now extends BaseFrameworkSystem, no
13 * other modifications has been done (except this comment ;-) ).
15 * For license file, original README and CREDITS file, see
16 * framework/main/third_party/scrypt/.
18 * As with all cryptographic code; it is recommended that you use a tried and
19 * tested library which uses this library; rather than rolling your own.
25 * @author Dominic Black <thephenix@gmail.com>
26 * @license http://www.opensource.org/licenses/BSD-2-Clause BSD 2-Clause License
27 * @link http://github.com/DomBlack/php-scrypt
31 * This class abstracts away from scrypt module, allowing for easy use.
33 * You can create a new hash for a password by calling Scrypt:hashScrypt($password)
35 * You can check a password by calling Scrypt:checkScrypt($password, $hash)
39 * @author Dominic Black <thephenix@gmail.com>
40 * @author Roland Haeder <roland@mxchange.org>
41 * @license http://www.opensource.org/licenses/BSD-2-Clause BSD 2-Clause License
42 * @link http://github.com/DomBlack/php-scrypt
44 abstract class Scrypt extends BaseFrameworkSystem
49 * @var int The key length
51 private static $_keyLength = 32;
54 * Get the byte-length of the given string
56 * @param string $str Input string
60 protected static function strlen ($str) {
61 static $isShadowed = null;
63 if ($isShadowed === null) {
64 $isShadowed = extension_loaded('mbstring') &&
65 ini_get('mbstring.func_overload') & 2;
69 return mb_strlen($str, '8bit');
76 * Generates a random salt
78 * @param int $length The length of the salt
80 * @return string The salt
82 public static function generateScryptSalt ($length = 8)
85 $buffer_valid = false;
86 if (function_exists('mcrypt_create_iv') && !defined('PHALANGER')) {
87 $buffer = mcrypt_create_iv($length, MCRYPT_DEV_URANDOM);
92 if (!$buffer_valid && function_exists('openssl_random_pseudo_bytes')) {
93 $cryptoStrong = false;
94 $buffer = openssl_random_pseudo_bytes($length, $cryptoStrong);
95 if ($buffer && $cryptoStrong) {
99 if (!$buffer_valid && FrameworkBootstrap::isReadableFile('/dev/urandom')) {
100 $f = fopen('/dev/urandom', 'r');
101 $read = static::strlen($buffer);
102 while ($read < $length) {
103 $buffer .= fread($f, $length - $read);
104 $read = static::strlen($buffer);
107 if ($read >= $length) {
108 $buffer_valid = true;
111 if (!$buffer_valid || static::strlen($buffer) < $length) {
112 $bl = static::strlen($buffer);
113 for ($i = 0; $i < $length; $i++) {
115 $buffer[$i] = $buffer[$i] ^ chr(mt_rand(0, 255));
117 $buffer .= chr(mt_rand(0, 255));
121 $salt = str_replace(array('+', '$'), array('.', ''), base64_encode($buffer));
127 * Create a password hash
129 * @param string $password The clear text password
130 * @param string $salt The salt to use, or null to generate a random one
131 * @param int $N The CPU difficultly (must be a power of 2, > 1)
132 * @param int $r The memory difficultly
133 * @param int $p The parallel difficultly
135 * @return string The hashed password
137 public static function hashScrypt ($password, $salt = false, $N = 16384, $r = 8, $p = 1)
139 if (!FrameworkFeature::isFeatureAvailable('hubcoin_reward')) {
140 // Feature has been disabled
141 throw new \InvalidArgumentException('Feature "scrypt" disabled.');
144 if ($N == 0 || ($N & ($N - 1)) != 0) {
145 throw new \InvalidArgumentException('N must be > 0 and a power of 2');
148 if ($N > PHP_INT_MAX / 128 / $r) {
149 throw new \InvalidArgumentException('Parameter N is too large');
152 if ($r > PHP_INT_MAX / 128 / $p) {
153 throw new \InvalidArgumentException('Parameter r is too large');
156 if ($salt === false) {
157 $salt = self::generateScryptSalt();
159 // Remove dollar signs from the salt, as we use that as a separator.
160 $salt = str_replace(array('+', '$'), array('.', ''), base64_encode($salt));
163 $hash = scrypt($password, $salt, $N, $r, $p, self::$_keyLength);
165 return $N . '$' . $r . '$' . $p . '$' . $salt . '$' . $hash;
169 * Check a clear text password against a hash
171 * @param string $password The clear text password
172 * @param string $hash The hashed password
174 * @return boolean If the clear text matches
176 public static function checkScrypt ($password, $hash)
178 // Is there actually a hash?
183 if (!FrameworkFeature::isFeatureAvailable('hubcoin_reward')) {
184 // Feature has been disabled
185 throw new \InvalidArgumentException('Feature "scrypt" disabled.');
188 list ($N, $r, $p, $salt, $hash) = explode('$', $hash);
191 if (empty($N) or empty($r) or empty($p) or empty($salt) or empty($hash)) {
195 // Are numeric values numeric?
196 if (!is_numeric($N) or !is_numeric($r) or !is_numeric($p)) {
200 $calculated = scrypt($password, $salt, $N, $r, $p, self::$_keyLength);
202 // Use compareScryptHashes to avoid timeing attacks
203 return self::compareScryptHashes($hash, $calculated);
207 * Zend Framework (http://framework.zend.com/)
209 * @link http://github.com/zendframework/zf2 for the canonical source repository
210 * @copyright Copyright (c) 2005-2013 Zend Technologies USA Inc. (http://www.zend.com)
211 * @license http://framework.zend.com/license/new-bsd New BSD License
213 * Compare two strings to avoid timing attacks
215 * C function memcmp() internally used by PHP, exits as soon as a difference
216 * is found in the two buffers. That makes possible of leaking
217 * timing information useful to an attacker attempting to iteratively guess
218 * the unknown string (e.g. password).
220 * @param string $expected
221 * @param string $actual
223 * @return boolean If the two strings match.
225 public static function compareScryptHashes ($expected, $actual)
227 $expected = (string) $expected;
228 $actual = (string) $actual;
229 $lenExpected = static::strlen($expected);
230 $lenActual = static::strlen($actual);
231 $len = min($lenExpected, $lenActual);
234 for ($i = 0; $i < $len; $i ++) {
235 $result |= ord($expected[$i]) ^ ord($actual[$i]);
237 $result |= $lenExpected ^ $lenActual;
239 return ($result === 0);