105 lines
2.7 KiB
PHP
105 lines
2.7 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 Capicom Random Number Source
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*
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* This uses the Windows CapiCom Com object to generate random 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 Capicom Random Number Source
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*
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* This uses the Windows CapiCom Com object to generate random 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 CAPICOM extends \RandomLib\AbstractSource
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{
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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::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 bool
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*/
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public static function isSupported()
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{
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return class_exists('\\COM', false);
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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 (!\class_exists('COM', false)) {
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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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try {
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/** @var \COM $util */
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$util = new \COM('CAPICOM.Utilities.1');
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if (!\method_exists($util, 'GetRandom')) {
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/** @var string $result */
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$result = static::emptyValue($size);
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return $result;
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}
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$data = base64_decode((string) $util->GetRandom($size, 0));
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return (string) str_pad($data, $size, chr(0));
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} catch (\Exception $e) {
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unset($e);
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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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}
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}
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