bug #96 move libraries to library - better alignment of like rotator

1 files changed, 690 insertions, 0 deletions

diff --git a/library/phpsec/Crypt/TripleDES.php b/library/phpsec/Crypt/TripleDES.php
new file mode 100644
index 000000000..4d0dbbca0
--- /dev/null
+++ b/library/phpsec/Crypt/TripleDES.php
@@ -0,0 +1,690 @@
+<?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