Finally drop CI_Encrypt

1 files changed, 0 insertions, 521 deletions

diff --git a/system/libraries/Encrypt.php b/system/libraries/Encrypt.php
deleted file mode 100644
index df1af4cf4..000000000
--- a/system/libraries/Encrypt.php
+++ /dev/null
@@ -1,521 +0,0 @@
-<?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);
-	}
-}