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<?php |
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/** |
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* The URandom Random Number Source |
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* |
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* This uses the *nix /dev/urandom device to generate medium 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 URandom Random Number Source |
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* |
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* This uses the *nix /dev/urandom device to generate medium 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 URandom extends \RandomLib\AbstractSource { |
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/** |
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* @var string The file to read from |
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*/ |
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protected static $file = '/dev/urandom'; |
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/** |
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* Return an instance of Strength indicating the strength of the source |
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* |
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* @return \SecurityLib\Strength An instance of one of the strength classes |
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*/ |
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public static function getStrength() { |
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return new Strength(Strength::MEDIUM); |
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} |
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/** |
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* If the source is currently available. |
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* Reasons might be because the library is not installed |
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* |
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* @return boolean |
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*/ |
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public static function isSupported() |
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{ |
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return @file_exists(static::$file); |
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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 ($size == 0) { |
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return static::emptyValue($size); |
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} |
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$file = fopen(static::$file, 'rb'); |
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if (!$file) { |
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return static::emptyValue($size); |
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} |
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if (function_exists('stream_set_read_buffer')) { |
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stream_set_read_buffer($file, 0); |
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} |
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$result = fread($file, $size); |
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fclose($file); |
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return $result; |
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} |
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} |
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ircmaxell /
RandomLib
