317 lines
8.2 KiB
PHP
317 lines
8.2 KiB
PHP
<?php
|
|
/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
|
|
|
|
/**
|
|
* Crypt_Blowfish allows for encryption and decryption on the fly using
|
|
* the Blowfish algorithm. Crypt_Blowfish does not require the mcrypt
|
|
* PHP extension, it uses only PHP.
|
|
* Crypt_Blowfish support encryption/decryption with or without a secret key.
|
|
*
|
|
*
|
|
* PHP versions 4 and 5
|
|
*
|
|
* LICENSE: This source file is subject to version 3.0 of the PHP license
|
|
* that is available through the world-wide-web at the following URI:
|
|
* http://www.php.net/license/3_0.txt. If you did not receive a copy of
|
|
* the PHP License and are unable to obtain it through the web, please
|
|
* send a note to license@php.net so we can mail you a copy immediately.
|
|
*
|
|
* @category Encryption
|
|
* @package Crypt_Blowfish
|
|
* @author Matthew Fonda <mfonda@php.net>
|
|
* @copyright 2005 Matthew Fonda
|
|
* @license http://www.php.net/license/3_0.txt PHP License 3.0
|
|
* @version CVS: $Id: Blowfish.php,v 1.81 2005/05/30 18:40:36 mfonda Exp $
|
|
* @link http://pear.php.net/package/Crypt_Blowfish
|
|
*/
|
|
|
|
|
|
require_once 'PEAR.php';
|
|
|
|
|
|
/**
|
|
*
|
|
* Example usage:
|
|
* $bf = new Crypt_Blowfish('some secret key!');
|
|
* $encrypted = $bf->encrypt('this is some example plain text');
|
|
* $plaintext = $bf->decrypt($encrypted);
|
|
* echo "plain text: $plaintext";
|
|
*
|
|
*
|
|
* @category Encryption
|
|
* @package Crypt_Blowfish
|
|
* @author Matthew Fonda <mfonda@php.net>
|
|
* @copyright 2005 Matthew Fonda
|
|
* @license http://www.php.net/license/3_0.txt PHP License 3.0
|
|
* @link http://pear.php.net/package/Crypt_Blowfish
|
|
* @version @package_version@
|
|
* @access public
|
|
*/
|
|
class Crypt_Blowfish
|
|
{
|
|
/**
|
|
* P-Array contains 18 32-bit subkeys
|
|
*
|
|
* @var array
|
|
* @access private
|
|
*/
|
|
var $_P = array();
|
|
|
|
|
|
/**
|
|
* Array of four S-Blocks each containing 256 32-bit entries
|
|
*
|
|
* @var array
|
|
* @access private
|
|
*/
|
|
var $_S = array();
|
|
|
|
/**
|
|
* Mcrypt td resource
|
|
*
|
|
* @var resource
|
|
* @access private
|
|
*/
|
|
var $_td = null;
|
|
|
|
/**
|
|
* Initialization vector
|
|
*
|
|
* @var string
|
|
* @access private
|
|
*/
|
|
var $_iv = null;
|
|
|
|
|
|
/**
|
|
* Crypt_Blowfish Constructor
|
|
* Initializes the Crypt_Blowfish object, and gives a sets
|
|
* the secret key
|
|
*
|
|
* @param string $key
|
|
* @access public
|
|
*/
|
|
function Crypt_Blowfish($key)
|
|
{
|
|
if (extension_loaded('mcrypt')) {
|
|
$this->_td = mcrypt_module_open(MCRYPT_BLOWFISH, '', 'ecb', '');
|
|
$this->_iv = mcrypt_create_iv(8, MCRYPT_RAND);
|
|
}
|
|
$this->setKey($key);
|
|
}
|
|
|
|
/**
|
|
* Deprecated isReady method
|
|
*
|
|
* @return bool
|
|
* @access public
|
|
* @deprecated
|
|
*/
|
|
function isReady()
|
|
{
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Deprecated init method - init is now a private
|
|
* method and has been replaced with _init
|
|
*
|
|
* @return bool
|
|
* @access public
|
|
* @deprecated
|
|
* @see Crypt_Blowfish::_init()
|
|
*/
|
|
function init()
|
|
{
|
|
$this->_init();
|
|
}
|
|
|
|
/**
|
|
* Initializes the Crypt_Blowfish object
|
|
*
|
|
* @access private
|
|
*/
|
|
function _init()
|
|
{
|
|
$defaults = new Crypt_Blowfish_DefaultKey();
|
|
$this->_P = $defaults->P;
|
|
$this->_S = $defaults->S;
|
|
}
|
|
|
|
/**
|
|
* Enciphers a single 64 bit block
|
|
*
|
|
* @param int &$Xl
|
|
* @param int &$Xr
|
|
* @access private
|
|
*/
|
|
function _encipher(&$Xl, &$Xr)
|
|
{
|
|
for ($i = 0; $i < 16; $i++) {
|
|
$temp = $Xl ^ $this->_P[$i];
|
|
$Xl = ((($this->_S[0][($temp>>24) & 255] +
|
|
$this->_S[1][($temp>>16) & 255]) ^
|
|
$this->_S[2][($temp>>8) & 255]) +
|
|
$this->_S[3][$temp & 255]) ^ $Xr;
|
|
$Xr = $temp;
|
|
}
|
|
$Xr = $Xl ^ $this->_P[16];
|
|
$Xl = $temp ^ $this->_P[17];
|
|
}
|
|
|
|
|
|
/**
|
|
* Deciphers a single 64 bit block
|
|
*
|
|
* @param int &$Xl
|
|
* @param int &$Xr
|
|
* @access private
|
|
*/
|
|
function _decipher(&$Xl, &$Xr)
|
|
{
|
|
for ($i = 17; $i > 1; $i--) {
|
|
$temp = $Xl ^ $this->_P[$i];
|
|
$Xl = ((($this->_S[0][($temp>>24) & 255] +
|
|
$this->_S[1][($temp>>16) & 255]) ^
|
|
$this->_S[2][($temp>>8) & 255]) +
|
|
$this->_S[3][$temp & 255]) ^ $Xr;
|
|
$Xr = $temp;
|
|
}
|
|
$Xr = $Xl ^ $this->_P[1];
|
|
$Xl = $temp ^ $this->_P[0];
|
|
}
|
|
|
|
|
|
/**
|
|
* Encrypts a string
|
|
*
|
|
* @param string $plainText
|
|
* @return string Returns cipher text on success, PEAR_Error on failure
|
|
* @access public
|
|
*/
|
|
function encrypt($plainText)
|
|
{
|
|
if (!is_string($plainText)) {
|
|
PEAR::raiseError('Plain text must be a string', 0, PEAR_ERROR_DIE);
|
|
}
|
|
|
|
if (extension_loaded('mcrypt')) {
|
|
return mcrypt_generic($this->_td, $plainText);
|
|
}
|
|
|
|
$cipherText = '';
|
|
$len = strlen($plainText);
|
|
$plainText .= str_repeat(chr(0),(8 - ($len%8))%8);
|
|
for ($i = 0; $i < $len; $i += 8) {
|
|
list(,$Xl,$Xr) = unpack("N2",substr($plainText,$i,8));
|
|
$this->_encipher($Xl, $Xr);
|
|
$cipherText .= pack("N2", $Xl, $Xr);
|
|
}
|
|
return $cipherText;
|
|
}
|
|
|
|
|
|
/**
|
|
* Decrypts an encrypted string
|
|
*
|
|
* @param string $cipherText
|
|
* @return string Returns plain text on success, PEAR_Error on failure
|
|
* @access public
|
|
*/
|
|
function decrypt($cipherText)
|
|
{
|
|
if (!is_string($cipherText)) {
|
|
PEAR::raiseError('Chiper text must be a string', 1, PEAR_ERROR_DIE);
|
|
}
|
|
|
|
if (extension_loaded('mcrypt')) {
|
|
return mdecrypt_generic($this->_td, $cipherText);
|
|
}
|
|
|
|
$plainText = '';
|
|
$len = strlen($cipherText);
|
|
$cipherText .= str_repeat(chr(0),(8 - ($len%8))%8);
|
|
for ($i = 0; $i < $len; $i += 8) {
|
|
list(,$Xl,$Xr) = unpack("N2",substr($cipherText,$i,8));
|
|
$this->_decipher($Xl, $Xr);
|
|
$plainText .= pack("N2", $Xl, $Xr);
|
|
}
|
|
return $plainText;
|
|
}
|
|
|
|
|
|
/**
|
|
* Sets the secret key
|
|
* The key must be non-zero, and less than or equal to
|
|
* 56 characters in length.
|
|
*
|
|
* @param string $key
|
|
* @return bool Returns true on success, PEAR_Error on failure
|
|
* @access public
|
|
*/
|
|
function setKey($key)
|
|
{
|
|
if (!is_string($key)) {
|
|
PEAR::raiseError('Key must be a string', 2, PEAR_ERROR_DIE);
|
|
}
|
|
|
|
$len = strlen($key);
|
|
|
|
if ($len > 56 || $len == 0) {
|
|
PEAR::raiseError('Key must be less than 56 characters and non-zero. Supplied key length: ' . $len, 3, PEAR_ERROR_DIE);
|
|
}
|
|
|
|
if (extension_loaded('mcrypt')) {
|
|
mcrypt_generic_init($this->_td, $key, $this->_iv);
|
|
return true;
|
|
}
|
|
|
|
require_once 'Blowfish/DefaultKey.php';
|
|
$this->_init();
|
|
|
|
$k = 0;
|
|
$data = 0;
|
|
$datal = 0;
|
|
$datar = 0;
|
|
|
|
for ($i = 0; $i < 18; $i++) {
|
|
$data = 0;
|
|
for ($j = 4; $j > 0; $j--) {
|
|
$data = $data << 8 | ord($key{$k});
|
|
$k = ($k+1) % $len;
|
|
}
|
|
$this->_P[$i] ^= $data;
|
|
}
|
|
|
|
for ($i = 0; $i <= 16; $i += 2) {
|
|
$this->_encipher($datal, $datar);
|
|
$this->_P[$i] = $datal;
|
|
$this->_P[$i+1] = $datar;
|
|
}
|
|
for ($i = 0; $i < 256; $i += 2) {
|
|
$this->_encipher($datal, $datar);
|
|
$this->_S[0][$i] = $datal;
|
|
$this->_S[0][$i+1] = $datar;
|
|
}
|
|
for ($i = 0; $i < 256; $i += 2) {
|
|
$this->_encipher($datal, $datar);
|
|
$this->_S[1][$i] = $datal;
|
|
$this->_S[1][$i+1] = $datar;
|
|
}
|
|
for ($i = 0; $i < 256; $i += 2) {
|
|
$this->_encipher($datal, $datar);
|
|
$this->_S[2][$i] = $datal;
|
|
$this->_S[2][$i+1] = $datar;
|
|
}
|
|
for ($i = 0; $i < 256; $i += 2) {
|
|
$this->_encipher($datal, $datar);
|
|
$this->_S[3][$i] = $datal;
|
|
$this->_S[3][$i+1] = $datar;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
}
|
|
|
|
?>
|