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<?php |
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/** |
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* Random.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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* @link https://apigen.ci/github/mmeyer2k/dcrypt |
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*/ |
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namespace Dcrypt; |
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/** |
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* Fail-safe wrapper for mcrypt_create_iv (preferably) and |
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* openssl_random_pseudo_bytes (fallback). |
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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/class-Dcrypt.Random.html |
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*/ |
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final class Random |
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{ |
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/** |
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* Get random bytes from Mcrypt |
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* |
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* @param int $bytes Number of bytes to get |
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* |
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* @return string |
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*/ |
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private static function fromMcrypt($bytes) |
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{ |
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$ret = \mcrypt_create_iv($bytes, MCRYPT_DEV_URANDOM); |
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if ($ret === false) { |
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self::toss(); // @codeCoverageIgnore |
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} |
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return $ret; |
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} |
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/** |
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* Return securely generated random bytes. |
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* |
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* @param int $bytes Number of bytes to get |
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* |
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* @return string |
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*/ |
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public static function bytes($bytes) |
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{ |
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if (\function_exists('random_bytes')) { |
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return \random_bytes($bytes); |
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} elseif (\function_exists('mcrypt_create_iv')) { |
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return self::fromMcrypt($bytes); |
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} |
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self::toss(); // @codeCoverageIgnore |
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} |
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/** |
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* Throw an error when a failure occurs. |
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* |
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* @codeCoverageIgnore |
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*/ |
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private static function toss() |
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{ |
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$e = 'Dcrypt failed to generate a random number'; |
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throw new \exception($e); |
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} |
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/** |
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* Deterministic seeded array shuffle function. |
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* |
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* @param array $array |
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* @param string $seed |
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* @param int $mode |
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* |
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* @return array |
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*/ |
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public static function shuffle($array, $seed, $mode = MT_RAND_PHP) |
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{ |
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$count = count($array); |
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$range = range(0, count($array) - 1); |
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// Hash the seed and extract bytes to make integer with |
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$seed = substr(hash('sha256', $seed, true), 0, PHP_INT_SIZE); |
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// Convert bytes to int |
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$seed = unpack("L", $seed); |
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mt_srand($seed[1], $mode); |
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foreach ($range as $a) { |
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$b = mt_rand(0, $count - 1); |
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$v = $array[$a]; |
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$array[$a] = $array[$b]; |
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$array[$b] = $v; |
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} |
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return $array; |
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} |
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} |
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mmeyer2k /
dcrypt
