109 lines
2.8 KiB
PHP
109 lines
2.8 KiB
PHP
<?php
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/*
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* The RandomLib library for securely generating random numbers and strings in PHP
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*
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* @author Anthony Ferrara <ircmaxell@ircmaxell.com>
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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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/**
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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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*
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* @author Anthony Ferrara <ircmaxell@ircmaxell.com>
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* @author Paragon Initiative Enterprises <security@paragonie.com>
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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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*
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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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*
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* @author Anthony Ferrara <ircmaxell@ircmaxell.com>
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* @author Paragon Initiative Enterprises <security@paragonie.com>
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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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/**
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* @var string The file to read from
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*/
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protected static $file = '/dev/urandom';
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/**
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* Return an instance of Strength indicating the strength of the source
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*
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* @return \SecurityLib\Strength An instance of one of the strength classes
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*/
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public static function getStrength()
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{
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return new Strength(Strength::HIGH);
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}
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/**
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* If the source is currently available.
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* Reasons might be because the library is not installed
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*
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* @return bool
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*/
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public static function isSupported()
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{
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return (bool) @\file_exists(static::$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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{
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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 (!\is_resource($file)) {
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/** @var string $result */
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$result = static::emptyValue($size);
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return $result;
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}
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if (\is_callable('stream_set_read_buffer')) {
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\stream_set_read_buffer($file, 0);
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}
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/** @var string $result */
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$result = \fread($file, $size);
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if (!\is_string($result)) {
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/** @var string $result */
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$result = static::emptyValue($size);
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return $result;
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}
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\fclose($file);
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return $result;
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}
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}
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