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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 Hash medium strength mixer class
*
* This class implements a mixer based upon the recommendations in RFC 4086
* section 5.2
*
* PHP version 5.3
*
* @see http://tools.ietf.org/html/rfc4086#section-5.2
*
* @category PHPCryptLib
* @package Random
* @subpackage Mixer
*
* @author Anthony Ferrara <ircmaxell@ircmaxell.com>
* @copyright 2011 The Authors
* @license http://www.opensource.org/licenses/mit-license.html MIT License
*
* @version Build @@version@@
*/
namespace RandomLib\Mixer;
use SecurityLib\Strength;
use SecurityLib\Util;
/**
* The Hash medium strength mixer class
*
* This class implements a mixer based upon the recommendations in RFC 4086
* section 5.2
*
* @see http://tools.ietf.org/html/rfc4086#section-5.2
*
* @category PHPCryptLib
* @package Random
* @subpackage Mixer
*
* @author Anthony Ferrara <ircmaxell@ircmaxell.com>
*/
class Hash extends \RandomLib\AbstractMixer
{
/**
* @var string The hash instance to use
*/
protected $hash = null;
/**
* Build the hash mixer
*
* @param string $hash The hash instance to use (defaults to sha512)
*
* @return void
*/
public function __construct($hash = 'sha512')
{
$this->hash = $hash;
}
/**
* Return an instance of Strength indicating the strength of the source
*
* @return \SecurityLib\Strength An instance of one of the strength classes
*/
public static function getStrength()
{
return new Strength(Strength::MEDIUM);
}
/**
* Test to see if the mixer is available
*
* @return bool If the mixer is available on the system
*/
public static function test()
{
return true;
}
/**
* Get the block size (the size of the individual blocks used for the mixing)
*
* @return int The block size
*/
protected function getPartSize()
{
return Util::safeStrlen(hash($this->hash, '', true));
}
/**
* Mix 2 parts together using one method
*
* @param string $part1 The first part to mix
* @param string $part2 The second part to mix
*
* @return string The mixed data
*/
protected function mixParts1($part1, $part2)
{
return hash_hmac($this->hash, $part1, $part2, true);
}
/**
* Mix 2 parts together using another different method
*
* @param string $part1 The first part to mix
* @param string $part2 The second part to mix
*
* @return string The mixed data
*/
protected function mixParts2($part1, $part2)
{
return hash_hmac($this->hash, $part2, $part1, true);
}
}
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