112 lines
2.7 KiB
PHP
112 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 Hash medium strength mixer class
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*
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* This class implements a mixer based upon the recommendations in RFC 4086
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* section 5.2
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*
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* PHP version 5.3
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*
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* @see http://tools.ietf.org/html/rfc4086#section-5.2
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*
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* @category PHPCryptLib
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* @package Random
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* @subpackage Mixer
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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\Mixer;
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use SecurityLib\Strength;
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/**
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* The Hash medium strength mixer class
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*
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* This class implements a mixer based upon the recommendations in RFC 4086
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* section 5.2
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*
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* @see http://tools.ietf.org/html/rfc4086#section-5.2
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*
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* @category PHPCryptLib
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* @package Random
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* @subpackage Mixer
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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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*/
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class XorMixer extends \RandomLib\AbstractMixer
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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::VERYLOW);
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}
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/**
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* Test to see if the mixer is available
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*
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* @return bool If the mixer is available on the system
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*/
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public static function test()
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{
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return true;
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}
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/**
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* Get the block size (the size of the individual blocks used for the mixing)
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*
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* @return int The block size
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*/
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protected function getPartSize()
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{
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return 64;
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}
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/**
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* Mix 2 parts together using one method
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*
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* @param string $part1 The first part to mix
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* @param string $part2 The second part to mix
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*
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* @return string The mixed data
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*/
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protected function mixParts1($part1, $part2)
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{
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return (string) ($part1 ^ $part2);
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}
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/**
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* Mix 2 parts together using another different method
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*
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* @param string $part1 The first part to mix
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* @param string $part2 The second part to mix
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*
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* @return string The mixed data
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*/
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protected function mixParts2($part1, $part2)
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{
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// Both mixers are identical, this is for speed, not security
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return (string) ($part1 ^ $part2);
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}
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}
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