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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 Mcrypt abstract mixer class
*
* PHP version 5.3
*
* @category PHPCryptLib
* @package Random
* @subpackage Mixer
*
* @author Anthony Ferrara <ircmaxell@ircmaxell.com>
* @copyright 2013 The Authors
* @license http://www.opensource.org/licenses/mit-license.html MIT License
*
* @version Build @@version@@
*/
namespace RandomLib;
/**
* The mcrypt abstract mixer class
*
* @category PHPCryptLib
* @package Random
* @subpackage Mixer
*
* @author Anthony Ferrara <ircmaxell@ircmaxell.com>
* @author Chris Smith <chris@cs278.org>
*/
abstract class AbstractMcryptMixer extends AbstractMixer
{
/**
* mcrypt module resource
*
* @var resource
*/
private $mcrypt;
/**
* Block size of cipher
*
* @var int
*/
private $blockSize;
/**
* Cipher initialization vector
*
* @var string
*/
private $initv;
/**
* {@inheritdoc}
*/
public static function test()
{
return extension_loaded('mcrypt');
}
/**
* Construct mcrypt mixer
*/
public function __construct()
{
$this->mcrypt = mcrypt_module_open($this->getCipher(), '', MCRYPT_MODE_ECB, '');
$this->blockSize = mcrypt_enc_get_block_size($this->mcrypt);
$this->initv = str_repeat(chr(0), mcrypt_enc_get_iv_size($this->mcrypt));
}
/**
* Performs cleanup
*/
public function __destruct()
{
if ($this->mcrypt) {
mcrypt_module_close($this->mcrypt);
}
}
/**
* Fetch the cipher for mcrypt.
*
* @return string
*/
abstract protected function getCipher();
/**
* {@inheritdoc}
*/
protected function getPartSize()
{
return $this->blockSize;
}
/**
* {@inheritdoc}
*/
protected function mixParts1($part1, $part2)
{
return $this->encryptBlock($part1, $part2);
}
/**
* {@inheritdoc}
*/
protected function mixParts2($part1, $part2)
{
return $this->decryptBlock($part2, $part1);
}
/**
* Encrypts a block using the suppied key
*
* @param string $input Plaintext to encrypt
* @param string $key Encryption key
*
* @return string Resulting ciphertext
*/
private function encryptBlock($input, $key)
{
if (!$input && !$key) {
return '';
}
$this->prepareCipher($key);
$result = mcrypt_generic($this->mcrypt, $input);
mcrypt_generic_deinit($this->mcrypt);
return $result;
}
/**
* Derypts a block using the suppied key
*
* @param string $input Ciphertext to decrypt
* @param string $key Encryption key
*
* @return string Resulting plaintext
*/
private function decryptBlock($input, $key)
{
if (!$input && !$key) {
return '';
}
$this->prepareCipher($key);
$result = mdecrypt_generic($this->mcrypt, $input);
mcrypt_generic_deinit($this->mcrypt);
return $result;
}
/**
* Sets up the mcrypt module
*
* @param string $key
*
* @return void
*/
private function prepareCipher($key)
{
if (0 !== mcrypt_generic_init($this->mcrypt, $key, $this->initv)) {
throw new \RuntimeException('Failed to prepare mcrypt module');
}
}
}
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