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File/Folder	Size	Actions
AES.php	4.86 KB
Base.php	76.22 KB
Blowfish.php	27.93 KB
DES.php	72.16 KB
Hash.php	28.28 KB
RC2.php	21.91 KB
RC4.php	9.05 KB
RSA.php	104.73 KB
Random.php	14.34 KB
Rijndael.php	65.03 KB
TripleDES.php	13.33 KB
Twofish.php	39.28 KB
index.php	28 B

Edit: TripleDES.php

<?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 MMVII 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')) {
    require_once dirname(__FILE__).'/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', -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_DES_MODE_CBC3', CRYPT_DES_MODE_CBC);

/**
 * Pure-PHP implementation of Triple DES.
 *
 * @package Crypt_TripleDES
 * @author  Jim Wigginton <terrafrost@php.net>
 * @access  public
 */
class Crypt_TripleDES extends Crypt_DES
{
    /**
     * The default password key_size used by setPassword()
     *
     * @see    Crypt_DES::password_key_size
     * @see    Crypt_Base::password_key_size
     * @see    Crypt_Base::setPassword()
     * @var Integer
     * @access private
     */
    public $password_key_size = 24;

/**
     * The default salt used by setPassword()
     *
     * @see    Crypt_Base::password_default_salt
     * @see    Crypt_Base::setPassword()
     * @var String
     * @access private
     */
    public $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
     */
    public $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
     */
    public $cipher_name_mcrypt = 'tripledes';

/**
     * Optimizing value while CFB-encrypting
     *
     * @see    Crypt_Base::cfb_init_len
     * @var Integer
     * @access private
     */
    public $cfb_init_len = 750;

/**
     * max possible size of $key
     *
     * @see    Crypt_TripleDES::setKey()
     * @see    Crypt_DES::setKey()
     * @var String
     * @access private
     */
    public $key_size_max = 24;

/**
     * Internal flag whether using CRYPT_DES_MODE_3CBC or not
     *
     * @var Boolean
     * @access private
     */
    public $mode_3cbc;

/**
     * The Crypt_DES objects
     *
     * Used only if $mode_3cbc === true
     *
     * @var Array
     * @access private
     */
    public $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 optional Integer $mode
     *
     * @access public
     */
    public function __construct($mode = CRYPT_DES_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::__construct(CRYPT_DES_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_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();
                $this->des[2]->disablePadding();
                break;
            // If not 3CBC, we init as usual
            default:
                parent::__construct($mode);
        }
    }

/**
     * 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 $iv
     */
    public function setIV($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.
     *
     * 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 $key
     */
    public function setKey($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 $cipertext
     */
    public function encrypt($plaintext)
    {
        // parent::en/decrypt() is able to do all the work for all modes and keylengths,
        // except for: CRYPT_DES_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 $plaintext
     */
    public function decrypt($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($plaintext, 8, 8)));
     * </code>
     *
     * With the continuous buffer disabled, these would yield the same output.  With it enabled, they yield different
     * outputs.  The reason is due to the fact that the initialization vector's change after every encryption /
     * decryption round when the continuous buffer is enabled.  When it's disabled, they remain constant.
     *
     * Put another way, when the continuous buffer is enabled, the state of the Crypt_DES() object changes after each
     * encryption / decryption round, whereas otherwise, it'd remain constant.  For this reason, it's recommended that
     * continuous buffers not be used.  They do offer better security and are, in fact, sometimes required (SSH uses them),
     * however, they are also less intuitive and more likely to cause you problems.
     *
     * @see    Crypt_Base::enableContinuousBuffer()
     * @see    Crypt_TripleDES::disableContinuousBuffer()
     * @access public
     */
    public function enableContinuousBuffer()
    {
        parent::enableContinuousBuffer();
        if ($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    Crypt_TripleDES::enableContinuousBuffer()
     * @access public
     */
    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
     */
    public 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();
    }
}