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-<?php
-
-/**
- * Pure-PHP implementation of Triple DES.
- *
- * Uses mcrypt, if available, and an internal implementation, otherwise. Operates in the EDE3 mode (encrypt-decrypt-encrypt).
- *
- * PHP versions 4 and 5
- *
- * Here's a short example of how to use this library:
- * <code>
- * <?php
- * include 'Crypt/TripleDES.php';
- *
- * $des = new Crypt_TripleDES();
- *
- * $des->setKey('abcdefghijklmnopqrstuvwx');
- *
- * $size = 10 * 1024;
- * $plaintext = '';
- * for ($i = 0; $i < $size; $i++) {
- * $plaintext.= 'a';
- * }
- *
- * echo $des->decrypt($des->encrypt($plaintext));
- * ?>
- * </code>
- *
- * LICENSE: 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.
- *
- * @category Crypt
- * @package Crypt_TripleDES
- * @author Jim Wigginton <terrafrost@php.net>
- * @copyright 2007 Jim Wigginton
- * @license http://www.opensource.org/licenses/mit-license.html MIT License
- * @link http://phpseclib.sourceforge.net
- */
-
-/**
- * Include Crypt_DES
- */
-if (!class_exists('Crypt_DES')) {
- include_once 'DES.php';
-}
-
-/**#@+
- * @access public
- * @see self::Crypt_TripleDES()
- */
-/**
- * Encrypt / decrypt using inner chaining
- *
- * Inner chaining is used by SSH-1 and is generally considered to be less secure then outer chaining (CRYPT_DES_MODE_CBC3).
- */
-define('CRYPT_MODE_3CBC', -2);
-/**
- * BC version of the above.
- */
-define('CRYPT_DES_MODE_3CBC', -2);
-/**
- * Encrypt / decrypt using outer chaining
- *
- * Outer chaining is used by SSH-2 and when the mode is set to CRYPT_DES_MODE_CBC.
- */
-define('CRYPT_MODE_CBC3', CRYPT_MODE_CBC);
-/**
- * BC version of the above.
- */
-define('CRYPT_DES_MODE_CBC3', CRYPT_MODE_CBC3);
-/**#@-*/
-
-/**
- * Pure-PHP implementation of Triple DES.
- *
- * @package Crypt_TripleDES
- * @author Jim Wigginton <terrafrost@php.net>
- * @access public
- */
-class Crypt_TripleDES extends Crypt_DES
-{
- /**
- * Key Length (in bytes)
- *
- * @see Crypt_TripleDES::setKeyLength()
- * @var int
- * @access private
- */
- var $key_length = 24;
-
- /**
- * The default salt used by setPassword()
- *
- * @see Crypt_Base::password_default_salt
- * @see Crypt_Base::setPassword()
- * @var string
- * @access private
- */
- var $password_default_salt = 'phpseclib';
-
- /**
- * The namespace used by the cipher for its constants.
- *
- * @see Crypt_DES::const_namespace
- * @see Crypt_Base::const_namespace
- * @var string
- * @access private
- */
- var $const_namespace = 'DES';
-
- /**
- * The mcrypt specific name of the cipher
- *
- * @see Crypt_DES::cipher_name_mcrypt
- * @see Crypt_Base::cipher_name_mcrypt
- * @var string
- * @access private
- */
- var $cipher_name_mcrypt = 'tripledes';
-
- /**
- * Optimizing value while CFB-encrypting
- *
- * @see Crypt_Base::cfb_init_len
- * @var int
- * @access private
- */
- var $cfb_init_len = 750;
-
- /**
- * max possible size of $key
- *
- * @see self::setKey()
- * @see Crypt_DES::setKey()
- * @var string
- * @access private
- */
- var $key_length_max = 24;
-
- /**
- * Internal flag whether using CRYPT_DES_MODE_3CBC or not
- *
- * @var bool
- * @access private
- */
- var $mode_3cbc;
-
- /**
- * The Crypt_DES objects
- *
- * Used only if $mode_3cbc === true
- *
- * @var array
- * @access private
- */
- var $des;
-
- /**
- * Default Constructor.
- *
- * Determines whether or not the mcrypt extension should be used.
- *
- * $mode could be:
- *
- * - CRYPT_DES_MODE_ECB
- *
- * - CRYPT_DES_MODE_CBC
- *
- * - CRYPT_DES_MODE_CTR
- *
- * - CRYPT_DES_MODE_CFB
- *
- * - CRYPT_DES_MODE_OFB
- *
- * - CRYPT_DES_MODE_3CBC
- *
- * If not explicitly set, CRYPT_DES_MODE_CBC will be used.
- *
- * @see Crypt_DES::Crypt_DES()
- * @see Crypt_Base::Crypt_Base()
- * @param int $mode
- * @access public
- */
- function __construct($mode = CRYPT_MODE_CBC)
- {
- switch ($mode) {
- // In case of CRYPT_DES_MODE_3CBC, we init as CRYPT_DES_MODE_CBC
- // and additional flag us internally as 3CBC
- case CRYPT_DES_MODE_3CBC:
- parent::Crypt_Base(CRYPT_MODE_CBC);
- $this->mode_3cbc = true;
-
- // This three $des'es will do the 3CBC work (if $key > 64bits)
- $this->des = array(
- new Crypt_DES(CRYPT_MODE_CBC),
- new Crypt_DES(CRYPT_MODE_CBC),
- new Crypt_DES(CRYPT_MODE_CBC),
- );
-
- // we're going to be doing the padding, ourselves, so disable it in the Crypt_DES objects
- $this->des[0]->disablePadding();
- $this->des[1]->disablePadding();
- $this->des[2]->disablePadding();
- break;
- // If not 3CBC, we init as usual
- default:
- parent::__construct($mode);
- }
- }
-
- /**
- * PHP4 compatible Default Constructor.
- *
- * @see self::__construct()
- * @param int $mode
- * @access public
- */
- function Crypt_TripleDES($mode = CRYPT_MODE_CBC)
- {
- $this->__construct($mode);
- }
-
- /**
- * Test for engine validity
- *
- * This is mainly just a wrapper to set things up for Crypt_Base::isValidEngine()
- *
- * @see Crypt_Base::Crypt_Base()
- * @param int $engine
- * @access public
- * @return bool
- */
- function isValidEngine($engine)
- {
- if ($engine == CRYPT_ENGINE_OPENSSL) {
- $this->cipher_name_openssl_ecb = 'des-ede3';
- $mode = $this->_openssl_translate_mode();
- $this->cipher_name_openssl = $mode == 'ecb' ? 'des-ede3' : 'des-ede3-' . $mode;
- }
-
- return parent::isValidEngine($engine);
- }
-
- /**
- * Sets the initialization vector. (optional)
- *
- * SetIV is not required when CRYPT_DES_MODE_ECB is being used. If not explicitly set, it'll be assumed
- * to be all zero's.
- *
- * @see Crypt_Base::setIV()
- * @access public
- * @param string $iv
- */
- function setIV($iv)
- {
- parent::setIV($iv);
- if ($this->mode_3cbc) {
- $this->des[0]->setIV($iv);
- $this->des[1]->setIV($iv);
- $this->des[2]->setIV($iv);
- }
- }
-
- /**
- * Sets the key length.
- *
- * Valid key lengths are 64, 128 and 192
- *
- * @see Crypt_Base:setKeyLength()
- * @access public
- * @param int $length
- */
- function setKeyLength($length)
- {
- $length >>= 3;
- switch (true) {
- case $length <= 8:
- $this->key_length = 8;
- break;
- case $length <= 16:
- $this->key_length = 16;
- break;
- default:
- $this->key_length = 24;
- }
-
- parent::setKeyLength($length);
- }
-
- /**
- * Sets the key.
- *
- * Keys can be of any length. Triple DES, itself, can use 128-bit (eg. strlen($key) == 16) or
- * 192-bit (eg. strlen($key) == 24) keys. This function pads and truncates $key as appropriate.
- *
- * DES also requires that every eighth bit be a parity bit, however, we'll ignore that.
- *
- * If the key is not explicitly set, it'll be assumed to be all null bytes.
- *
- * @access public
- * @see Crypt_DES::setKey()
- * @see Crypt_Base::setKey()
- * @param string $key
- */
- function setKey($key)
- {
- $length = $this->explicit_key_length ? $this->key_length : strlen($key);
- if ($length > 8) {
- $key = str_pad(substr($key, 0, 24), 24, chr(0));
- // if $key is between 64 and 128-bits, use the first 64-bits as the last, per this:
- // http://php.net/function.mcrypt-encrypt#47973
- $key = $length <= 16 ? substr_replace($key, substr($key, 0, 8), 16) : substr($key, 0, 24);
- } else {
- $key = str_pad($key, 8, chr(0));
- }
- parent::setKey($key);
-
- // And in case of CRYPT_DES_MODE_3CBC:
- // if key <= 64bits we not need the 3 $des to work,
- // because we will then act as regular DES-CBC with just a <= 64bit key.
- // So only if the key > 64bits (> 8 bytes) we will call setKey() for the 3 $des.
- if ($this->mode_3cbc && $length > 8) {
- $this->des[0]->setKey(substr($key, 0, 8));
- $this->des[1]->setKey(substr($key, 8, 8));
- $this->des[2]->setKey(substr($key, 16, 8));
- }
- }
-
- /**
- * Encrypts a message.
- *
- * @see Crypt_Base::encrypt()
- * @access public
- * @param string $plaintext
- * @return string $cipertext
- */
- function encrypt($plaintext)
- {
- // parent::en/decrypt() is able to do all the work for all modes and keylengths,
- // except for: CRYPT_MODE_3CBC (inner chaining CBC) with a key > 64bits
-
- // if the key is smaller then 8, do what we'd normally do
- if ($this->mode_3cbc && strlen($this->key) > 8) {
- return $this->des[2]->encrypt(
- $this->des[1]->decrypt(
- $this->des[0]->encrypt(
- $this->_pad($plaintext)
- )
- )
- );
- }
-
- return parent::encrypt($plaintext);
- }
-
- /**
- * Decrypts a message.
- *
- * @see Crypt_Base::decrypt()
- * @access public
- * @param string $ciphertext
- * @return string $plaintext
- */
- function decrypt($ciphertext)
- {
- if ($this->mode_3cbc && strlen($this->key) > 8) {
- return $this->_unpad(
- $this->des[0]->decrypt(
- $this->des[1]->encrypt(
- $this->des[2]->decrypt(
- str_pad($ciphertext, (strlen($ciphertext) + 7) & 0xFFFFFFF8, "\0")
- )
- )
- )
- );
- }
-
- return parent::decrypt($ciphertext);
- }
-
- /**
- * Treat consecutive "packets" as if they are a continuous buffer.
- *
- * Say you have a 16-byte plaintext $plaintext. Using the default behavior, the two following code snippets
- * will yield different outputs:
- *
- * <code>
- * echo $des->encrypt(substr($plaintext, 0, 8));
- * echo $des->encrypt(substr($plaintext, 8, 8));
- * </code>
- * <code>
- * echo $des->encrypt($plaintext);
- * </code>
- *
- * The solution is to enable the continuous buffer. Although this will resolve the above discrepancy, it creates
- * another, as demonstrated with the following:
- *
- * <code>
- * $des->encrypt(substr($plaintext, 0, 8));
- * echo $des->decrypt($des->encrypt(substr($plaintext, 8, 8)));
- * </code>
- * <code>
- * echo $des->decrypt($des->encrypt(substr($plaintext, 8, 8)));
- * </code>
- *
- * With the continuous buffer disabled, these would yield the same output. With it enabled, they yield different
- * outputs. The reason is due to the fact that the initialization vector's change after every encryption /
- * decryption round when the continuous buffer is enabled. When it's disabled, they remain constant.
- *
- * Put another way, when the continuous buffer is enabled, the state of the Crypt_DES() object changes after each
- * encryption / decryption round, whereas otherwise, it'd remain constant. For this reason, it's recommended that
- * continuous buffers not be used. They do offer better security and are, in fact, sometimes required (SSH uses them),
- * however, they are also less intuitive and more likely to cause you problems.
- *
- * @see Crypt_Base::enableContinuousBuffer()
- * @see self::disableContinuousBuffer()
- * @access public
- */
- function enableContinuousBuffer()
- {
- parent::enableContinuousBuffer();
- if ($this->mode_3cbc) {
- $this->des[0]->enableContinuousBuffer();
- $this->des[1]->enableContinuousBuffer();
- $this->des[2]->enableContinuousBuffer();
- }
- }
-
- /**
- * Treat consecutive packets as if they are a discontinuous buffer.
- *
- * The default behavior.
- *
- * @see Crypt_Base::disableContinuousBuffer()
- * @see self::enableContinuousBuffer()
- * @access public
- */
- function disableContinuousBuffer()
- {
- parent::disableContinuousBuffer();
- if ($this->mode_3cbc) {
- $this->des[0]->disableContinuousBuffer();
- $this->des[1]->disableContinuousBuffer();
- $this->des[2]->disableContinuousBuffer();
- }
- }
-
- /**
- * Creates the key schedule
- *
- * @see Crypt_DES::_setupKey()
- * @see Crypt_Base::_setupKey()
- * @access private
- */
- function _setupKey()
- {
- switch (true) {
- // if $key <= 64bits we configure our internal pure-php cipher engine
- // to act as regular [1]DES, not as 3DES. mcrypt.so::tripledes does the same.
- case strlen($this->key) <= 8:
- $this->des_rounds = 1;
- break;
-
- // otherwise, if $key > 64bits, we configure our engine to work as 3DES.
- default:
- $this->des_rounds = 3;
-
- // (only) if 3CBC is used we have, of course, to setup the $des[0-2] keys also separately.
- if ($this->mode_3cbc) {
- $this->des[0]->_setupKey();
- $this->des[1]->_setupKey();
- $this->des[2]->_setupKey();
-
- // because $des[0-2] will, now, do all the work we can return here
- // not need unnecessary stress parent::_setupKey() with our, now unused, $key.
- return;
- }
- }
- // setup our key
- parent::_setupKey();
- }
-
- /**
- * Sets the internal crypt engine
- *
- * @see Crypt_Base::Crypt_Base()
- * @see Crypt_Base::setPreferredEngine()
- * @param int $engine
- * @access public
- * @return int
- */
- function setPreferredEngine($engine)
- {
- if ($this->mode_3cbc) {
- $this->des[0]->setPreferredEngine($engine);
- $this->des[1]->setPreferredEngine($engine);
- $this->des[2]->setPreferredEngine($engine);
- }
-
- return parent::setPreferredEngine($engine);
- }
-}
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