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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 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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* @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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* 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(int $bytes): string |
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{ |
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return \random_bytes($bytes); |
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} |
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/** |
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* Deterministic seeded array shuffle function. Does not keep keys. |
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* |
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* @param array $array Array to shuffle |
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* @param string $seed Seed to use |
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* @param bool $secure Whether to use secure RNG in PHP 7.1+. Use false to fall back to broken version for BC. |
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* |
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* @return array |
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*/ |
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public static function shuffle(array $array, string $seed, bool $secure = true): array |
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{ |
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$count = \count($array); |
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$range = \range(0, $count - 1); |
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// Hash the seed and extract bytes to make integer with |
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$seed = Str::substr(\hash('sha256', $seed, true), 0, PHP_INT_SIZE); |
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19 |
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// Convert bytes to an int |
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$seed = \unpack("L", $seed); |
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if (\version_compare(PHP_VERSION, '7.1.0') >= 0 && $secure === false) { |
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// Handle PHP 7.1+ calls requiring the old implementation which has broken implementation |
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\mt_srand($seed[1], MT_RAND_PHP); |
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} else { |
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\mt_srand($seed[1]); |
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} |
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// Swap array values randomly |
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foreach ($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
