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- <?php
- /*
- * The RandomLib library for securely generating random numbers and strings in PHP
- *
- * @author Anthony Ferrara <ircmaxell@ircmaxell.com>
- * @copyright 2011 The Authors
- * @license http://www.opensource.org/licenses/mit-license.html MIT License
- * @version Build @@version@@
- */
- /**
- * The URandom Random Number Source
- *
- * This uses the *nix /dev/urandom device to generate medium strength numbers
- *
- * PHP version 5.3
- *
- * @category PHPCryptLib
- * @package Random
- * @subpackage Source
- *
- * @author Anthony Ferrara <ircmaxell@ircmaxell.com>
- * @author Paragon Initiative Enterprises <security@paragonie.com>
- * @copyright 2011 The Authors
- * @license http://www.opensource.org/licenses/mit-license.html MIT License
- *
- * @version Build @@version@@
- */
- namespace RandomLib\Source;
- use SecurityLib\Strength;
- /**
- * The URandom Random Number Source
- *
- * This uses the *nix /dev/urandom device to generate medium strength numbers
- *
- * @category PHPCryptLib
- * @package Random
- * @subpackage Source
- *
- * @author Anthony Ferrara <ircmaxell@ircmaxell.com>
- * @author Paragon Initiative Enterprises <security@paragonie.com>
- * @codeCoverageIgnore
- */
- class URandom extends \RandomLib\AbstractSource
- {
- /**
- * @var string The file to read from
- */
- protected static $file = '/dev/urandom';
- /**
- * Return an instance of Strength indicating the strength of the source
- *
- * @return \SecurityLib\Strength An instance of one of the strength classes
- */
- public static function getStrength()
- {
- return new Strength(Strength::HIGH);
- }
- /**
- * If the source is currently available.
- * Reasons might be because the library is not installed
- *
- * @return bool
- */
- public static function isSupported()
- {
- return (bool) @\file_exists(static::$file);
- }
- /**
- * Generate a random string of the specified size
- *
- * @param int $size The size of the requested random string
- *
- * @return string A string of the requested size
- */
- public function generate($size)
- {
- if ($size == 0) {
- return static::emptyValue($size);
- }
- $file = \fopen(static::$file, 'rb');
- if (!\is_resource($file)) {
- /** @var string $result */
- $result = static::emptyValue($size);
- return $result;
- }
- if (\is_callable('stream_set_read_buffer')) {
- \stream_set_read_buffer($file, 0);
- }
- /** @var string $result */
- $result = \fread($file, $size);
- if (!\is_string($result)) {
- /** @var string $result */
- $result = static::emptyValue($size);
- return $result;
- }
- \fclose($file);
- return $result;
- }
- }
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