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<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
* CodeIgniter
*
* An open source application development framework for PHP 5.2.4 or newer
*
* NOTICE OF LICENSE
*
* Licensed under the Open Software License version 3.0
*
* This source file is subject to the Open Software License (OSL 3.0) that is
* bundled with this package in the files license.txt / license.rst. It is
* also available through the world wide web at this URL:
* http://opensource.org/licenses/OSL-3.0
* If you did not receive a copy of the license and are unable to obtain it
* through the world wide web, please send an email to
* licensing@ellislab.com so we can send you a copy immediately.
*
* @package CodeIgniter
* @author EllisLab Dev Team
* @copyright Copyright (c) 2008 - 2012, EllisLab, Inc. (http://ellislab.com/)
* @license http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
* @link http://codeigniter.com
* @since Version 1.0
* @filesource
*/
/**
* CodeIgniter Encryption Class
*
* Provides two-way keyed encoding using XOR Hashing and Mcrypt
*
* @package CodeIgniter
* @subpackage Libraries
* @category Libraries
* @author EllisLab Dev Team
* @link http://codeigniter.com/user_guide/libraries/encryption.html
*/
class CI_Encrypt {
/**
* Reference to the user's encryption key
*
* @var string
*/
public $encryption_key = '';
/**
* Type of hash operation
*
* @var string
*/
protected $_hash_type = 'sha1';
/**
* Flag for the existance of mcrypt
*
* @var bool
*/
protected $_mcrypt_exists = FALSE;
/**
* Current cipher to be used with mcrypt
*
* @var string
*/
protected $_mcrypt_cipher;
/**
* Method for encrypting/decrypting data
*
* @var int
*/
protected $_mcrypt_mode;
/**
* Initialize Encryption class
*
* @return void
*/
public function __construct()
{
$this->_mcrypt_exists = function_exists('mcrypt_encrypt');
log_message('debug', 'Encrypt Class Initialized');
}
// --------------------------------------------------------------------
/**
* Fetch the encryption key
*
* Returns it as MD5 in order to have an exact-length 128 bit key.
* Mcrypt is sensitive to keys that are not the correct length
*
* @param string
* @return string
*/
public function get_key($key = '')
{
if ($key === '')
{
if ($this->encryption_key !== '')
{
return $this->encryption_key;
}
$key = config_item('encryption_key');
if ($key === FALSE)
{
show_error('In order to use the encryption class requires that you set an encryption key in your config file.');
}
}
return md5($key);
}
// --------------------------------------------------------------------
/**
* Set the encryption key
*
* @param string
* @return object
*/
public function set_key($key = '')
{
$this->encryption_key = $key;
return $this;
}
// --------------------------------------------------------------------
/**
* Encode
*
* Encodes the message string using bitwise XOR encoding.
* The key is combined with a random hash, and then it
* too gets converted using XOR. The whole thing is then run
* through mcrypt (if supported) using the randomized key.
* The end result is a double-encrypted message string
* that is randomized with each call to this function,
* even if the supplied message and key are the same.
*
* @param string the string to encode
* @param string the key
* @return string
*/
public function encode($string, $key = '')
{
$method = ($this->_mcrypt_exists === TRUE) ? 'mcrypt_encode' : '_xor_encode';
return base64_encode($this->$method($string, $this->get_key($key)));
}
// --------------------------------------------------------------------
/**
* Decode
*
* Reverses the above process
*
* @param string
* @param string
* @return string
*/
public function decode($string, $key = '')
{
if (preg_match('/[^a-zA-Z0-9\/\+=]/', $string))
{
return FALSE;
}
$method = ($this->_mcrypt_exists === TRUE) ? 'mcrypt_decode' : '_xor_decode';
return $this->$method(base64_decode($string), $this->get_key($key));
}
// --------------------------------------------------------------------
/**
* Encode from Legacy
*
* Takes an encoded string from the original Encryption class algorithms and
* returns a newly encoded string using the improved method added in 2.0.0
* This allows for backwards compatibility and a method to transition to the
* new encryption algorithms.
*
* For more details, see http://codeigniter.com/user_guide/installation/upgrade_200.html#encryption
*
* @param string
* @param int (mcrypt mode constant)
* @param string
* @return string
*/
public function encode_from_legacy($string, $legacy_mode = MCRYPT_MODE_ECB, $key = '')
{
if ($this->_mcrypt_exists === FALSE)
{
log_message('error', 'Encoding from legacy is available only when Mcrypt is in use.');
return FALSE;
}
elseif (preg_match('/[^a-zA-Z0-9\/\+=]/', $string))
{
return FALSE;
}
// decode it first
// set mode temporarily to what it was when string was encoded with the legacy
// algorithm - typically MCRYPT_MODE_ECB
$current_mode = $this->_get_mode();
$this->set_mode($legacy_mode);
$key = $this->get_key($key);
$dec = base64_decode($string);
if (($dec = $this->mcrypt_decode($dec, $key)) === FALSE)
{
$this->set_mode($current_mode);
return FALSE;
}
$dec = $this->_xor_decode($dec, $key);
// set the mcrypt mode back to what it should be, typically MCRYPT_MODE_CBC
$this->set_mode($current_mode);
// and re-encode
return base64_encode($this->mcrypt_encode($dec, $key));
}
// --------------------------------------------------------------------
/**
* XOR Encode
*
* Takes a plain-text string and key as input and generates an
* encoded bit-string using XOR
*
* @param string
* @param string
* @return string
*/
protected function _xor_encode($string, $key)
{
$rand = '';
do
{
$rand .= mt_rand(0, mt_getrandmax());
}
while (strlen($rand) < 32);
$rand = $this->hash($rand);
$enc = '';
for ($i = 0, $ls = strlen($string), $lr = strlen($rand); $i < $ls; $i++)
{
$enc .= $rand[($i % $lr)].($rand[($i % $lr)] ^ $string[$i]);
}
return $this->_xor_merge($enc, $key);
}
// --------------------------------------------------------------------
/**
* XOR Decode
*
* Takes an encoded string and key as input and generates the
* plain-text original message
*
* @param string
* @param string
* @return string
*/
protected function _xor_decode($string, $key)
{
$string = $this->_xor_merge($string, $key);
$dec = '';
for ($i = 0, $l = strlen($string); $i < $l; $i++)
{
$dec .= ($string[$i++] ^ $string[$i]);
}
return $dec;
}
// --------------------------------------------------------------------
/**
* XOR key + string Combiner
*
* Takes a string and key as input and computes the difference using XOR
*
* @param string
* @param string
* @return string
*/
protected function _xor_merge($string, $key)
{
$hash = $this->hash($key);
$str = '';
for ($i = 0, $ls = strlen($string), $lh = strlen($hash); $i < $ls; $i++)
{
$str .= $string[$i] ^ $hash[($i % $lh)];
}
return $str;
}
// --------------------------------------------------------------------
/**
* Encrypt using Mcrypt
*
* @param string
* @param string
* @return string
*/
public function mcrypt_encode($data, $key)
{
$init_size = mcrypt_get_iv_size($this->_get_cipher(), $this->_get_mode());
$init_vect = mcrypt_create_iv($init_size, MCRYPT_RAND);
return $this->_add_cipher_noise($init_vect.mcrypt_encrypt($this->_get_cipher(), $key, $data, $this->_get_mode(), $init_vect), $key);
}
// --------------------------------------------------------------------
/**
* Decrypt using Mcrypt
*
* @param string
* @param string
* @return string
*/
public function mcrypt_decode($data, $key)
{
$data = $this->_remove_cipher_noise($data, $key);
$init_size = mcrypt_get_iv_size($this->_get_cipher(), $this->_get_mode());
if ($init_size > strlen($data))
{
return FALSE;
}
$init_vect = substr($data, 0, $init_size);
$data = substr($data, $init_size);
return rtrim(mcrypt_decrypt($this->_get_cipher(), $key, $data, $this->_get_mode(), $init_vect), "\0");
}
// --------------------------------------------------------------------
/**
* Adds permuted noise to the IV + encrypted data to protect
* against Man-in-the-middle attacks on CBC mode ciphers
* http://www.ciphersbyritter.com/GLOSSARY.HTM#IV
*
* @param string
* @param string
* @return string
*/
protected function _add_cipher_noise($data, $key)
{
$key = $this->hash($key);
$str = '';
for ($i = 0, $j = 0, $ld = strlen($data), $lk = strlen($key); $i < $ld; ++$i, ++$j)
{
if ($j >= $lk)
{
$j = 0;
}
$str .= chr((ord($data[$i]) + ord($key[$j])) % 256);
}
return $str;
}
// --------------------------------------------------------------------
/**
* Removes permuted noise from the IV + encrypted data, reversing
* _add_cipher_noise()
*
* Function description
*
* @param string $data
* @param string $key
* @return string
*/
protected function _remove_cipher_noise($data, $key)
{
$key = $this->hash($key);
$str = '';
for ($i = 0, $j = 0, $ld = strlen($data), $lk = strlen($key); $i < $ld; ++$i, ++$j)
{
if ($j >= $lk)
{
$j = 0;
}
$temp = ord($data[$i]) - ord($key[$j]);
if ($temp < 0)
{
$temp += 256;
}
$str .= chr($temp);
}
return $str;
}
// --------------------------------------------------------------------
/**
* Set the Mcrypt Cipher
*
* @param int
* @return object
*/
public function set_cipher($cipher)
{
$this->_mcrypt_cipher = $cipher;
return $this;
}
// --------------------------------------------------------------------
/**
* Set the Mcrypt Mode
*
* @param int
* @return object
*/
public function set_mode($mode)
{
$this->_mcrypt_mode = $mode;
return $this;
}
// --------------------------------------------------------------------
/**
* Get Mcrypt cipher Value
*
* @return int
*/
protected function _get_cipher()
{
if ($this->_mcrypt_cipher === NULL)
{
return $this->_mcrypt_cipher = MCRYPT_RIJNDAEL_256;
}
return $this->_mcrypt_cipher;
}
// --------------------------------------------------------------------
/**
* Get Mcrypt Mode Value
*
* @return int
*/
protected function _get_mode()
{
if ($this->_mcrypt_mode === NULL)
{
return $this->_mcrypt_mode = MCRYPT_MODE_CBC;
}
return $this->_mcrypt_mode;
}
// --------------------------------------------------------------------
/**
* Set the Hash type
*
* @param string
* @return void
*/
public function set_hash($type = 'sha1')
{
$this->_hash_type = ($type !== 'sha1' && $type !== 'md5') ? 'sha1' : $type;
}
// --------------------------------------------------------------------
/**
* Hash encode a string
*
* @param string
* @return string
*/
public function hash($str)
{
return ($this->_hash_type === 'sha1') ? sha1($str) : md5($str);
}
}
/* End of file Encrypt.php */
/* Location: ./system/libraries/Encrypt.php */
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