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Diffstat (limited to 'library/phpsec/Crypt/TripleDES.php')
| -rw-r--r-- | library/phpsec/Crypt/TripleDES.php | 690 |
1 files changed, 0 insertions, 690 deletions
diff --git a/library/phpsec/Crypt/TripleDES.php b/library/phpsec/Crypt/TripleDES.php deleted file mode 100644 index 4d0dbbca0..000000000 --- a/library/phpsec/Crypt/TripleDES.php +++ /dev/null @@ -1,690 +0,0 @@ -<?php
-/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
-
-/**
- * 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: This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
- *
- * @category Crypt
- * @package Crypt_TripleDES
- * @author Jim Wigginton <terrafrost@php.net>
- * @copyright MMVII Jim Wigginton
- * @license http://www.gnu.org/licenses/lgpl.txt
- * @version $Id: TripleDES.php,v 1.13 2010/02/26 03:40:25 terrafrost Exp $
- * @link http://phpseclib.sourceforge.net
- */
-
-/**
- * Include Crypt_DES
- */
-require_once 'DES.php';
-
-/**
- * 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_DES_MODE_3CBC', 3);
-
-/**
- * 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_DES_MODE_CBC3', CRYPT_DES_MODE_CBC);
-
-/**
- * Pure-PHP implementation of Triple DES.
- *
- * @author Jim Wigginton <terrafrost@php.net>
- * @version 0.1.0
- * @access public
- * @package Crypt_TerraDES
- */
-class Crypt_TripleDES {
- /**
- * The Three Keys
- *
- * @see Crypt_TripleDES::setKey()
- * @var String
- * @access private
- */
- var $key = "\0\0\0\0\0\0\0\0";
-
- /**
- * The Encryption Mode
- *
- * @see Crypt_TripleDES::Crypt_TripleDES()
- * @var Integer
- * @access private
- */
- var $mode = CRYPT_DES_MODE_CBC;
-
- /**
- * Continuous Buffer status
- *
- * @see Crypt_TripleDES::enableContinuousBuffer()
- * @var Boolean
- * @access private
- */
- var $continuousBuffer = false;
-
- /**
- * Padding status
- *
- * @see Crypt_TripleDES::enablePadding()
- * @var Boolean
- * @access private
- */
- var $padding = true;
-
- /**
- * The Initialization Vector
- *
- * @see Crypt_TripleDES::setIV()
- * @var String
- * @access private
- */
- var $iv = "\0\0\0\0\0\0\0\0";
-
- /**
- * A "sliding" Initialization Vector
- *
- * @see Crypt_TripleDES::enableContinuousBuffer()
- * @var String
- * @access private
- */
- var $encryptIV = "\0\0\0\0\0\0\0\0";
-
- /**
- * A "sliding" Initialization Vector
- *
- * @see Crypt_TripleDES::enableContinuousBuffer()
- * @var String
- * @access private
- */
- var $decryptIV = "\0\0\0\0\0\0\0\0";
-
- /**
- * The Crypt_DES objects
- *
- * @var Array
- * @access private
- */
- var $des;
-
- /**
- * mcrypt resource for encryption
- *
- * The mcrypt resource can be recreated every time something needs to be created or it can be created just once.
- * Since mcrypt operates in continuous mode, by default, it'll need to be recreated when in non-continuous mode.
- *
- * @see Crypt_AES::encrypt()
- * @var String
- * @access private
- */
- var $enmcrypt;
-
- /**
- * mcrypt resource for decryption
- *
- * The mcrypt resource can be recreated every time something needs to be created or it can be created just once.
- * Since mcrypt operates in continuous mode, by default, it'll need to be recreated when in non-continuous mode.
- *
- * @see Crypt_AES::decrypt()
- * @var String
- * @access private
- */
- var $demcrypt;
-
- /**
- * Does the (en|de)mcrypt resource need to be (re)initialized?
- *
- * @see setKey()
- * @see setIV()
- * @var Boolean
- * @access private
- */
- var $changed = true;
-
- /**
- * Default Constructor.
- *
- * Determines whether or not the mcrypt extension should be used. $mode should only, at present, be
- * CRYPT_DES_MODE_ECB or CRYPT_DES_MODE_CBC. If not explictly set, CRYPT_DES_MODE_CBC will be used.
- *
- * @param optional Integer $mode
- * @return Crypt_TripleDES
- * @access public
- */
- function Crypt_TripleDES($mode = CRYPT_DES_MODE_CBC)
- {
- if ( !defined('CRYPT_DES_MODE') ) {
- switch (true) {
- case extension_loaded('mcrypt'):
- // i'd check to see if des was supported, by doing in_array('des', mcrypt_list_algorithms('')),
- // but since that can be changed after the object has been created, there doesn't seem to be
- // a lot of point...
- define('CRYPT_DES_MODE', CRYPT_DES_MODE_MCRYPT);
- break;
- default:
- define('CRYPT_DES_MODE', CRYPT_DES_MODE_INTERNAL);
- }
- }
-
- if ( $mode == CRYPT_DES_MODE_3CBC ) {
- $this->mode = CRYPT_DES_MODE_3CBC;
- $this->des = array(
- new Crypt_DES(CRYPT_DES_MODE_CBC),
- new Crypt_DES(CRYPT_DES_MODE_CBC),
- new Crypt_DES(CRYPT_DES_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();
- $this->des[2]->disablePadding();
-
- return;
- }
-
- switch ( CRYPT_DES_MODE ) {
- case CRYPT_DES_MODE_MCRYPT:
- switch ($mode) {
- case CRYPT_DES_MODE_ECB:
- $this->mode = MCRYPT_MODE_ECB;
- break;
- case CRYPT_DES_MODE_CTR:
- $this->mode = 'ctr';
- break;
- case CRYPT_DES_MODE_CBC:
- default:
- $this->mode = MCRYPT_MODE_CBC;
- }
-
- break;
- default:
- $this->des = array(
- new Crypt_DES(CRYPT_DES_MODE_ECB),
- new Crypt_DES(CRYPT_DES_MODE_ECB),
- new Crypt_DES(CRYPT_DES_MODE_ECB)
- );
-
- // 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();
- $this->des[2]->disablePadding();
-
- switch ($mode) {
- case CRYPT_DES_MODE_ECB:
- case CRYPT_DES_MODE_CTR:
- case CRYPT_DES_MODE_CBC:
- $this->mode = $mode;
- break;
- default:
- $this->mode = CRYPT_DES_MODE_CBC;
- }
- }
- }
-
- /**
- * Sets the key.
- *
- * Keys can be of any length. Triple DES, itself, can use 128-bit (eg. strlen($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 zero's.
- *
- * @access public
- * @param String $key
- */
- function setKey($key)
- {
- $length = strlen($key);
- if ($length > 8) {
- $key = str_pad($key, 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);
- }
- $this->key = $key;
- switch (true) {
- case CRYPT_DES_MODE == CRYPT_DES_MODE_INTERNAL:
- case $this->mode == CRYPT_DES_MODE_3CBC:
- $this->des[0]->setKey(substr($key, 0, 8));
- $this->des[1]->setKey(substr($key, 8, 8));
- $this->des[2]->setKey(substr($key, 16, 8));
- }
- $this->changed = true;
- }
-
- /**
- * Sets the initialization vector. (optional)
- *
- * SetIV is not required when CRYPT_DES_MODE_ECB is being used. If not explictly set, it'll be assumed
- * to be all zero's.
- *
- * @access public
- * @param String $iv
- */
- function setIV($iv)
- {
- $this->encryptIV = $this->decryptIV = $this->iv = str_pad(substr($iv, 0, 8), 8, chr(0));
- if ($this->mode == CRYPT_DES_MODE_3CBC) {
- $this->des[0]->setIV($iv);
- $this->des[1]->setIV($iv);
- $this->des[2]->setIV($iv);
- }
- $this->changed = true;
- }
-
- /**
- * Generate CTR XOR encryption key
- *
- * Encrypt the output of this and XOR it against the ciphertext / plaintext to get the
- * plaintext / ciphertext in CTR mode.
- *
- * @see Crypt_DES::decrypt()
- * @see Crypt_DES::encrypt()
- * @access public
- * @param Integer $length
- * @param String $iv
- */
- function _generate_xor($length, &$iv)
- {
- $xor = '';
- $num_blocks = ($length + 7) >> 3;
- for ($i = 0; $i < $num_blocks; $i++) {
- $xor.= $iv;
- for ($j = 4; $j <= 8; $j+=4) {
- $temp = substr($iv, -$j, 4);
- switch ($temp) {
- case "\xFF\xFF\xFF\xFF":
- $iv = substr_replace($iv, "\x00\x00\x00\x00", -$j, 4);
- break;
- case "\x7F\xFF\xFF\xFF":
- $iv = substr_replace($iv, "\x80\x00\x00\x00", -$j, 4);
- break 2;
- default:
- extract(unpack('Ncount', $temp));
- $iv = substr_replace($iv, pack('N', $count + 1), -$j, 4);
- break 2;
- }
- }
- }
-
- return $xor;
- }
-
- /**
- * Encrypts a message.
- *
- * @access public
- * @param String $plaintext
- */
- function encrypt($plaintext)
- {
- if ($this->mode != CRYPT_DES_MODE_CTR && $this->mode != 'ctr') {
- $plaintext = $this->_pad($plaintext);
- }
-
- // if the key is smaller then 8, do what we'd normally do
- if ($this->mode == CRYPT_DES_MODE_3CBC && strlen($this->key) > 8) {
- $ciphertext = $this->des[2]->encrypt($this->des[1]->decrypt($this->des[0]->encrypt($plaintext)));
-
- return $ciphertext;
- }
-
- if ( CRYPT_DES_MODE == CRYPT_DES_MODE_MCRYPT ) {
- if ($this->changed) {
- if (!isset($this->enmcrypt)) {
- $this->enmcrypt = mcrypt_module_open(MCRYPT_3DES, '', $this->mode, '');
- }
- mcrypt_generic_init($this->enmcrypt, $this->key, $this->encryptIV);
- $this->changed = false;
- }
-
- $ciphertext = mcrypt_generic($this->enmcrypt, $plaintext);
-
- if (!$this->continuousBuffer) {
- mcrypt_generic_init($this->enmcrypt, $this->key, $this->encryptIV);
- }
-
- return $ciphertext;
- }
-
- if (strlen($this->key) <= 8) {
- $this->des[0]->mode = $this->mode;
-
- return $this->des[0]->encrypt($plaintext);
- }
-
- // we pad with chr(0) since that's what mcrypt_generic does. to quote from http://php.net/function.mcrypt-generic :
- // "The data is padded with "\0" to make sure the length of the data is n * blocksize."
- $plaintext = str_pad($plaintext, ceil(strlen($plaintext) / 8) * 8, chr(0));
-
- $des = $this->des;
-
- $ciphertext = '';
- switch ($this->mode) {
- case CRYPT_DES_MODE_ECB:
- for ($i = 0; $i < strlen($plaintext); $i+=8) {
- $block = substr($plaintext, $i, 8);
- $block = $des[0]->_processBlock($block, CRYPT_DES_ENCRYPT);
- $block = $des[1]->_processBlock($block, CRYPT_DES_DECRYPT);
- $block = $des[2]->_processBlock($block, CRYPT_DES_ENCRYPT);
- $ciphertext.= $block;
- }
- break;
- case CRYPT_DES_MODE_CBC:
- $xor = $this->encryptIV;
- for ($i = 0; $i < strlen($plaintext); $i+=8) {
- $block = substr($plaintext, $i, 8) ^ $xor;
- $block = $des[0]->_processBlock($block, CRYPT_DES_ENCRYPT);
- $block = $des[1]->_processBlock($block, CRYPT_DES_DECRYPT);
- $block = $des[2]->_processBlock($block, CRYPT_DES_ENCRYPT);
- $xor = $block;
- $ciphertext.= $block;
- }
- if ($this->continuousBuffer) {
- $this->encryptIV = $xor;
- }
- break;
- case CRYPT_DES_MODE_CTR:
- $xor = $this->encryptIV;
- for ($i = 0; $i < strlen($plaintext); $i+=8) {
- $key = $this->_generate_xor(8, $xor);
- $key = $des[0]->_processBlock($key, CRYPT_DES_ENCRYPT);
- $key = $des[1]->_processBlock($key, CRYPT_DES_DECRYPT);
- $key = $des[2]->_processBlock($key, CRYPT_DES_ENCRYPT);
- $block = substr($plaintext, $i, 8);
- $ciphertext.= $block ^ $key;
- }
- if ($this->continuousBuffer) {
- $this->encryptIV = $xor;
- }
- }
-
- return $ciphertext;
- }
-
- /**
- * Decrypts a message.
- *
- * @access public
- * @param String $ciphertext
- */
- function decrypt($ciphertext)
- {
- if ($this->mode == CRYPT_DES_MODE_3CBC && strlen($this->key) > 8) {
- $plaintext = $this->des[0]->decrypt($this->des[1]->encrypt($this->des[2]->decrypt($ciphertext)));
-
- return $this->_unpad($plaintext);
- }
-
- // we pad with chr(0) since that's what mcrypt_generic does. to quote from http://php.net/function.mcrypt-generic :
- // "The data is padded with "\0" to make sure the length of the data is n * blocksize."
- $ciphertext = str_pad($ciphertext, (strlen($ciphertext) + 7) & 0xFFFFFFF8, chr(0));
-
- if ( CRYPT_DES_MODE == CRYPT_DES_MODE_MCRYPT ) {
- if ($this->changed) {
- if (!isset($this->demcrypt)) {
- $this->demcrypt = mcrypt_module_open(MCRYPT_3DES, '', $this->mode, '');
- }
- mcrypt_generic_init($this->demcrypt, $this->key, $this->decryptIV);
- $this->changed = false;
- }
-
- $plaintext = mdecrypt_generic($this->demcrypt, $ciphertext);
-
- if (!$this->continuousBuffer) {
- mcrypt_generic_init($this->demcrypt, $this->key, $this->decryptIV);
- }
-
- return $this->mode != 'ctr' ? $this->_unpad($plaintext) : $plaintext;
- }
-
- if (strlen($this->key) <= 8) {
- $this->des[0]->mode = $this->mode;
-
- return $this->_unpad($this->des[0]->decrypt($plaintext));
- }
-
- $des = $this->des;
-
- $plaintext = '';
- switch ($this->mode) {
- case CRYPT_DES_MODE_ECB:
- for ($i = 0; $i < strlen($ciphertext); $i+=8) {
- $block = substr($ciphertext, $i, 8);
- $block = $des[2]->_processBlock($block, CRYPT_DES_DECRYPT);
- $block = $des[1]->_processBlock($block, CRYPT_DES_ENCRYPT);
- $block = $des[0]->_processBlock($block, CRYPT_DES_DECRYPT);
- $plaintext.= $block;
- }
- break;
- case CRYPT_DES_MODE_CBC:
- $xor = $this->decryptIV;
- for ($i = 0; $i < strlen($ciphertext); $i+=8) {
- $orig = $block = substr($ciphertext, $i, 8);
- $block = $des[2]->_processBlock($block, CRYPT_DES_DECRYPT);
- $block = $des[1]->_processBlock($block, CRYPT_DES_ENCRYPT);
- $block = $des[0]->_processBlock($block, CRYPT_DES_DECRYPT);
- $plaintext.= $block ^ $xor;
- $xor = $orig;
- }
- if ($this->continuousBuffer) {
- $this->decryptIV = $xor;
- }
- break;
- case CRYPT_DES_MODE_CTR:
- $xor = $this->decryptIV;
- for ($i = 0; $i < strlen($ciphertext); $i+=8) {
- $key = $this->_generate_xor(8, $xor);
- $key = $des[0]->_processBlock($key, CRYPT_DES_ENCRYPT);
- $key = $des[1]->_processBlock($key, CRYPT_DES_DECRYPT);
- $key = $des[2]->_processBlock($key, CRYPT_DES_ENCRYPT);
- $block = substr($ciphertext, $i, 8);
- $plaintext.= $block ^ $key;
- }
- if ($this->continuousBuffer) {
- $this->decryptIV = $xor;
- }
- }
-
- return $this->mode != CRYPT_DES_MODE_CTR ? $this->_unpad($plaintext) : $plaintext;
- }
-
- /**
- * 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_TripleDES::disableContinuousBuffer()
- * @access public
- */
- function enableContinuousBuffer()
- {
- $this->continuousBuffer = true;
- if ($this->mode == CRYPT_DES_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_TripleDES::enableContinuousBuffer()
- * @access public
- */
- function disableContinuousBuffer()
- {
- $this->continuousBuffer = false;
- $this->encryptIV = $this->iv;
- $this->decryptIV = $this->iv;
-
- if ($this->mode == CRYPT_DES_MODE_3CBC) {
- $this->des[0]->disableContinuousBuffer();
- $this->des[1]->disableContinuousBuffer();
- $this->des[2]->disableContinuousBuffer();
- }
- }
-
- /**
- * Pad "packets".
- *
- * DES works by encrypting eight bytes at a time. If you ever need to encrypt or decrypt something that's not
- * a multiple of eight, it becomes necessary to pad the input so that it's length is a multiple of eight.
- *
- * Padding is enabled by default. Sometimes, however, it is undesirable to pad strings. Such is the case in SSH1,
- * where "packets" are padded with random bytes before being encrypted. Unpad these packets and you risk stripping
- * away characters that shouldn't be stripped away. (SSH knows how many bytes are added because the length is
- * transmitted separately)
- *
- * @see Crypt_TripleDES::disablePadding()
- * @access public
- */
- function enablePadding()
- {
- $this->padding = true;
- }
-
- /**
- * Do not pad packets.
- *
- * @see Crypt_TripleDES::enablePadding()
- * @access public
- */
- function disablePadding()
- {
- $this->padding = false;
- }
-
- /**
- * Pads a string
- *
- * Pads a string using the RSA PKCS padding standards so that its length is a multiple of the blocksize (8).
- * 8 - (strlen($text) & 7) bytes are added, each of which is equal to chr(8 - (strlen($text) & 7)
- *
- * If padding is disabled and $text is not a multiple of the blocksize, the string will be padded regardless
- * and padding will, hence forth, be enabled.
- *
- * @see Crypt_TripleDES::_unpad()
- * @access private
- */
- function _pad($text)
- {
- $length = strlen($text);
-
- if (!$this->padding) {
- if (($length & 7) == 0) {
- return $text;
- } else {
- user_error("The plaintext's length ($length) is not a multiple of the block size (8)", E_USER_NOTICE);
- $this->padding = true;
- }
- }
-
- $pad = 8 - ($length & 7);
- return str_pad($text, $length + $pad, chr($pad));
- }
-
- /**
- * Unpads a string
- *
- * If padding is enabled and the reported padding length is invalid the encryption key will be assumed to be wrong
- * and false will be returned.
- *
- * @see Crypt_TripleDES::_pad()
- * @access private
- */
- function _unpad($text)
- {
- if (!$this->padding) {
- return $text;
- }
-
- $length = ord($text[strlen($text) - 1]);
-
- if (!$length || $length > 8) {
- return false;
- }
-
- return substr($text, 0, -$length);
- }
-}
-
-// vim: ts=4:sw=4:et:
-// vim6: fdl=1:
\ No newline at end of file |