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<?php |
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/** |
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* The OpenSSL Random Number Source |
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* |
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* This uses the OS's secure generator to generate high strength numbers |
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* |
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* PHP version 5.3 |
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* |
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* @category PHPCryptLib |
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* @package Random |
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* @subpackage Source |
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* @author Anthony Ferrara <[email protected]> |
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* @copyright 2011 The Authors |
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* @license http://www.opensource.org/licenses/mit-license.html MIT License |
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* @version Build @@version@@ |
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*/ |
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namespace RandomLib\Source; |
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use SecurityLib\Strength; |
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/** |
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* The OpenSSL Random Number Source |
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* |
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* This uses the OS's secure generator to generate high strength numbers |
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* |
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* @category PHPCryptLib |
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* @package Random |
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* @subpackage Source |
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* @author Anthony Ferrara <[email protected]> |
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* @codeCoverageIgnore |
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*/ |
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class OpenSSL extends \RandomLib\AbstractSource { |
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/** |
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* Return an instance of Strength indicating the strength of the source |
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* |
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* @return \SecurityLib\Strength An instance of one of the strength classes |
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*/ |
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public static function getStrength() { |
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/** |
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* Prior to PHP 5.6.12 (see https://bugs.php.net/bug.php?id=70014) the "openssl_random_pseudo_bytes" |
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* was using "RAND_pseudo_bytes" (predictable) instead of "RAND_bytes" (unpredictable). |
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* Release notes: http://php.net/ChangeLog-5.php#5.6.12 |
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*/ |
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if (PHP_VERSION_ID >= 50612) { |
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return new Strength(Strength::HIGH); |
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} |
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/** |
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* Prior to PHP 5.5.28 (see https://bugs.php.net/bug.php?id=70014) the "openssl_random_pseudo_bytes" |
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* was using "RAND_pseudo_bytes" (predictable) instead of "RAND_bytes" (unpredictable). |
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* Release notes: http://php.net/ChangeLog-5.php#5.5.28 |
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*/ |
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if (PHP_VERSION_ID >= 50528 && PHP_VERSION_ID < 50600) { |
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return new Strength(Strength::HIGH); |
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} |
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/** |
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* Prior to PHP 5.4.44 (see https://bugs.php.net/bug.php?id=70014) the "openssl_random_pseudo_bytes" |
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* was using "RAND_pseudo_bytes" (predictable) instead of "RAND_bytes" (unpredictable). |
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* Release notes: http://php.net/ChangeLog-5.php#5.4.44 |
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*/ |
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if (PHP_VERSION_ID >= 50444 && PHP_VERSION_ID < 50500) { |
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return new Strength(Strength::HIGH); |
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} |
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return new Strength(Strength::MEDIUM); |
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} |
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/** |
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* If the source is currently available. |
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* Reasons might be because the library is not installed |
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* |
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* @return boolean |
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*/ |
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public static function isSupported() { |
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return function_exists('openssl_random_pseudo_bytes'); |
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} |
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/** |
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* Generate a random string of the specified size |
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* |
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* @param int $size The size of the requested random string |
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* |
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* @return string A string of the requested size |
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*/ |
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public function generate($size) { |
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if ($size < 1) { |
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return str_repeat(chr(0), $size); |
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} |
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/** |
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* Note, normally we would check the return of of $crypto_strong to |
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* ensure that we generated a good random string. However, since we're |
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* using this as one part of many sources a low strength random number |
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* shouldn't be much of an issue. |
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*/ |
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return openssl_random_pseudo_bytes($size); |
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} |
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} |
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ircmaxell /
RandomLib
