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-rw-r--r--system/libraries/Encrypt.php521
1 files changed, 0 insertions, 521 deletions
diff --git a/system/libraries/Encrypt.php b/system/libraries/Encrypt.php
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--- a/system/libraries/Encrypt.php
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-<?php
-/**
- * CodeIgniter
- *
- * An open source application development framework for PHP
- *
- * This content is released under the MIT License (MIT)
- *
- * Copyright (c) 2014 - 2019, British Columbia Institute of Technology
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * @package CodeIgniter
- * @author EllisLab Dev Team
- * @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
- * @copyright Copyright (c) 2014 - 2019, British Columbia Institute of Technology (https://bcit.ca/)
- * @license https://opensource.org/licenses/MIT MIT License
- * @link https://codeigniter.com
- * @since Version 1.0.0
- * @filesource
- */
-defined('BASEPATH') OR exit('No direct script access allowed');
-
-/**
- * CodeIgniter Encryption Class
- *
- * Provides two-way keyed encoding using Mcrypt
- *
- * @package CodeIgniter
- * @subpackage Libraries
- * @category Libraries
- * @author EllisLab Dev Team
- * @link https://codeigniter.com/userguide3/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 existence 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 $_mcrypt_mode;
-
- /**
- * Initialize Encryption class
- *
- * @return void
- */
- public function __construct()
- {
- if (($this->_mcrypt_exists = function_exists('mcrypt_encrypt')) === FALSE)
- {
- show_error('The Encrypt library requires the Mcrypt extension.');
- }
-
- log_message('info', '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;
- }
-
- $key = config_item('encryption_key');
-
- if ( ! self::strlen($key))
- {
- show_error('In order to use the encryption class requires that you set an encryption key in your config file.');
- }
- }
-
- return md5($key);
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Set the encryption key
- *
- * @param string
- * @return CI_Encrypt
- */
- public function set_key($key = '')
- {
- $this->encryption_key = $key;
- return $this;
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Encode
- *
- * Encodes the message string using bitwise XOR encoding.
- * The key is combined with a random hash, and then it
- * too gets converted using XOR. The whole thing is then run
- * through mcrypt using the randomized key. The end result
- * is a double-encrypted message string that is randomized
- * with each call to this function, even if the supplied
- * message and key are the same.
- *
- * @param string the string to encode
- * @param string the key
- * @return string
- */
- public function encode($string, $key = '')
- {
- return base64_encode($this->mcrypt_encode($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\/\+=]/', $string) OR base64_encode(base64_decode($string)) !== $string)
- {
- return FALSE;
- }
-
- return $this->mcrypt_decode(base64_decode($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 https://codeigniter.com/userguide3/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 (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, $key));
- }
-
- // --------------------------------------------------------------------
-
- /**
- * XOR Decode
- *
- * Takes an encoded string and key as input and generates the
- * plain-text original message
- *
- * @param string
- * @param string
- * @return string
- */
- protected function _xor_decode($string, $key)
- {
- $string = $this->_xor_merge($string, $key);
-
- $dec = '';
- for ($i = 0, $l = self::strlen($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, $ls = self::strlen($string), $lh = self::strlen($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_DEV_URANDOM);
- 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 > self::strlen($data))
- {
- return FALSE;
- }
-
- $init_vect = self::substr($data, 0, $init_size);
- $data = self::substr($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, $ld = self::strlen($data), $lk = self::strlen($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, $ld = self::strlen($data), $lk = self::strlen($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 $str;
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Set the Mcrypt Cipher
- *
- * @param int
- * @return CI_Encrypt
- */
- public function set_cipher($cipher)
- {
- $this->_mcrypt_cipher = $cipher;
- return $this;
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Set the Mcrypt Mode
- *
- * @param int
- * @return CI_Encrypt
- */
- public function set_mode($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')
- {
- $this->_hash_type = in_array($type, hash_algos()) ? $type : 'sha1';
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Hash encode a string
- *
- * @param string
- * @return string
- */
- public function hash($str)
- {
- return hash($this->_hash_type, $str);
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Byte-safe strlen()
- *
- * @param string $str
- * @return int
- */
- protected static function strlen($str)
- {
- return defined('MB_OVERLOAD_STRING')
- ? mb_strlen($str, '8bit')
- : strlen($str);
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Byte-safe substr()
- *
- * @param string $str
- * @param int $start
- * @param int $length
- * @return string
- */
- protected static function substr($str, $start, $length = NULL)
- {
- if (defined('MB_OVERLOAD_STRING'))
- {
- // mb_substr($str, $start, null, '8bit') returns an empty
- // string on PHP 5.3
- isset($length) OR $length = ($start >= 0 ? self::strlen($str) - $start : -$start);
- return mb_substr($str, $start, $length, '8bit');
- }
-
- return isset($length)
- ? substr($str, $start, $length)
- : substr($str, $start);
- }
-}