diff options
Diffstat (limited to 'phpsec/Crypt')
| -rw-r--r-- | phpsec/Crypt/AES.php | 479 | ||||
| -rw-r--r-- | phpsec/Crypt/DES.php | 945 | ||||
| -rw-r--r-- | phpsec/Crypt/Hash.php | 816 | ||||
| -rw-r--r-- | phpsec/Crypt/RC4.php | 493 | ||||
| -rw-r--r-- | phpsec/Crypt/RSA.php | 2119 | ||||
| -rw-r--r-- | phpsec/Crypt/Random.php | 130 | ||||
| -rw-r--r-- | phpsec/Crypt/Rijndael.php | 1242 | ||||
| -rw-r--r-- | phpsec/Crypt/TripleDES.php | 690 |
8 files changed, 6914 insertions, 0 deletions
diff --git a/phpsec/Crypt/AES.php b/phpsec/Crypt/AES.php new file mode 100644 index 000000000..681800a81 --- /dev/null +++ b/phpsec/Crypt/AES.php @@ -0,0 +1,479 @@ +<?php
+/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
+
+/**
+ * Pure-PHP implementation of AES.
+ *
+ * Uses mcrypt, if available, and an internal implementation, otherwise.
+ *
+ * PHP versions 4 and 5
+ *
+ * If {@link Crypt_AES::setKeyLength() setKeyLength()} isn't called, it'll be calculated from
+ * {@link Crypt_AES::setKey() setKey()}. ie. if the key is 128-bits, the key length will be 128-bits. If it's 136-bits
+ * it'll be null-padded to 160-bits and 160 bits will be the key length until {@link Crypt_Rijndael::setKey() setKey()}
+ * is called, again, at which point, it'll be recalculated.
+ *
+ * Since Crypt_AES extends Crypt_Rijndael, some functions are available to be called that, in the context of AES, don't
+ * make a whole lot of sense. {@link Crypt_AES::setBlockLength() setBlockLength()}, for instance. Calling that function,
+ * however possible, won't do anything (AES has a fixed block length whereas Rijndael has a variable one).
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ * include('Crypt/AES.php');
+ *
+ * $aes = new Crypt_AES();
+ *
+ * $aes->setKey('abcdefghijklmnop');
+ *
+ * $size = 10 * 1024;
+ * $plaintext = '';
+ * for ($i = 0; $i < $size; $i++) {
+ * $plaintext.= 'a';
+ * }
+ *
+ * echo $aes->decrypt($aes->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_AES
+ * @author Jim Wigginton <terrafrost@php.net>
+ * @copyright MMVIII Jim Wigginton
+ * @license http://www.gnu.org/licenses/lgpl.txt
+ * @version $Id: AES.php,v 1.7 2010/02/09 06:10:25 terrafrost Exp $
+ * @link http://phpseclib.sourceforge.net
+ */
+
+/**
+ * Include Crypt_Rijndael
+ */
+require_once 'Rijndael.php';
+
+/**#@+
+ * @access public
+ * @see Crypt_AES::encrypt()
+ * @see Crypt_AES::decrypt()
+ */
+/**
+ * Encrypt / decrypt using the Counter mode.
+ *
+ * Set to -1 since that's what Crypt/Random.php uses to index the CTR mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Counter_.28CTR.29
+ */
+define('CRYPT_AES_MODE_CTR', -1);
+/**
+ * Encrypt / decrypt using the Electronic Code Book mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29
+ */
+define('CRYPT_AES_MODE_ECB', 1);
+/**
+ * Encrypt / decrypt using the Code Book Chaining mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher-block_chaining_.28CBC.29
+ */
+define('CRYPT_AES_MODE_CBC', 2);
+/**#@-*/
+
+/**#@+
+ * @access private
+ * @see Crypt_AES::Crypt_AES()
+ */
+/**
+ * Toggles the internal implementation
+ */
+define('CRYPT_AES_MODE_INTERNAL', 1);
+/**
+ * Toggles the mcrypt implementation
+ */
+define('CRYPT_AES_MODE_MCRYPT', 2);
+/**#@-*/
+
+/**
+ * Pure-PHP implementation of AES.
+ *
+ * @author Jim Wigginton <terrafrost@php.net>
+ * @version 0.1.0
+ * @access public
+ * @package Crypt_AES
+ */
+class Crypt_AES extends Crypt_Rijndael {
+ /**
+ * 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;
+
+ /**
+ * Default Constructor.
+ *
+ * Determines whether or not the mcrypt extension should be used. $mode should only, at present, be
+ * CRYPT_AES_MODE_ECB or CRYPT_AES_MODE_CBC. If not explictly set, CRYPT_AES_MODE_CBC will be used.
+ *
+ * @param optional Integer $mode
+ * @return Crypt_AES
+ * @access public
+ */
+ function Crypt_AES($mode = CRYPT_AES_MODE_CBC)
+ {
+ if ( !defined('CRYPT_AES_MODE') ) {
+ switch (true) {
+ case extension_loaded('mcrypt'):
+ // i'd check to see if aes 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_AES_MODE', CRYPT_AES_MODE_MCRYPT);
+ break;
+ default:
+ define('CRYPT_AES_MODE', CRYPT_AES_MODE_INTERNAL);
+ }
+ }
+
+ switch ( CRYPT_AES_MODE ) {
+ case CRYPT_AES_MODE_MCRYPT:
+ switch ($mode) {
+ case CRYPT_AES_MODE_ECB:
+ $this->mode = MCRYPT_MODE_ECB;
+ break;
+ case CRYPT_AES_MODE_CTR:
+ // ctr doesn't have a constant associated with it even though it appears to be fairly widely
+ // supported. in lieu of knowing just how widely supported it is, i've, for now, opted not to
+ // include a compatibility layer. the layer has been implemented but, for now, is commented out.
+ $this->mode = 'ctr';
+ //$this->mode = in_array('ctr', mcrypt_list_modes()) ? 'ctr' : CRYPT_AES_MODE_CTR;
+ break;
+ case CRYPT_AES_MODE_CBC:
+ default:
+ $this->mode = MCRYPT_MODE_CBC;
+ }
+
+ break;
+ default:
+ switch ($mode) {
+ case CRYPT_AES_MODE_ECB:
+ $this->mode = CRYPT_RIJNDAEL_MODE_ECB;
+ break;
+ case CRYPT_AES_MODE_CTR:
+ $this->mode = CRYPT_RIJNDAEL_MODE_CTR;
+ break;
+ case CRYPT_AES_MODE_CBC:
+ default:
+ $this->mode = CRYPT_RIJNDAEL_MODE_CBC;
+ }
+ }
+
+ if (CRYPT_AES_MODE == CRYPT_AES_MODE_INTERNAL) {
+ parent::Crypt_Rijndael($this->mode);
+ }
+ }
+
+ /**
+ * Dummy function
+ *
+ * Since Crypt_AES extends Crypt_Rijndael, this function is, technically, available, but it doesn't do anything.
+ *
+ * @access public
+ * @param Integer $length
+ */
+ function setBlockLength($length)
+ {
+ return;
+ }
+
+ /**
+ * Encrypts a message.
+ *
+ * $plaintext will be padded with up to 16 additional bytes. Other AES implementations may or may not pad in the
+ * same manner. Other common approaches to padding and the reasons why it's necessary are discussed in the following
+ * URL:
+ *
+ * {@link http://www.di-mgt.com.au/cryptopad.html http://www.di-mgt.com.au/cryptopad.html}
+ *
+ * An alternative to padding is to, separately, send the length of the file. This is what SSH, in fact, does.
+ * strlen($plaintext) will still need to be a multiple of 16, however, arbitrary values can be added to make it that
+ * length.
+ *
+ * @see Crypt_AES::decrypt()
+ * @access public
+ * @param String $plaintext
+ */
+ function encrypt($plaintext)
+ {
+ if ( CRYPT_AES_MODE == CRYPT_AES_MODE_MCRYPT ) {
+ $this->_mcryptSetup();
+ /*
+ if ($this->mode == CRYPT_AES_MODE_CTR) {
+ $iv = $this->encryptIV;
+ $xor = mcrypt_generic($this->enmcrypt, $this->_generate_xor(strlen($plaintext), $iv));
+ $ciphertext = $plaintext ^ $xor;
+ if ($this->continuousBuffer) {
+ $this->encryptIV = $iv;
+ }
+ return $ciphertext;
+ }
+ */
+
+ if ($this->mode != 'ctr') {
+ $plaintext = $this->_pad($plaintext);
+ }
+
+ $ciphertext = mcrypt_generic($this->enmcrypt, $plaintext);
+
+ if (!$this->continuousBuffer) {
+ mcrypt_generic_init($this->enmcrypt, $this->key, $this->iv);
+ }
+
+ return $ciphertext;
+ }
+
+ return parent::encrypt($plaintext);
+ }
+
+ /**
+ * Decrypts a message.
+ *
+ * If strlen($ciphertext) is not a multiple of 16, null bytes will be added to the end of the string until it is.
+ *
+ * @see Crypt_AES::encrypt()
+ * @access public
+ * @param String $ciphertext
+ */
+ function decrypt($ciphertext)
+ {
+ if ( CRYPT_AES_MODE == CRYPT_AES_MODE_MCRYPT ) {
+ $this->_mcryptSetup();
+ /*
+ if ($this->mode == CRYPT_AES_MODE_CTR) {
+ $iv = $this->decryptIV;
+ $xor = mcrypt_generic($this->enmcrypt, $this->_generate_xor(strlen($ciphertext), $iv));
+ $plaintext = $ciphertext ^ $xor;
+ if ($this->continuousBuffer) {
+ $this->decryptIV = $iv;
+ }
+ return $plaintext;
+ }
+ */
+
+ if ($this->mode != 'ctr') {
+ // 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) + 15) & 0xFFFFFFF0, chr(0));
+ }
+
+ $plaintext = mdecrypt_generic($this->demcrypt, $ciphertext);
+
+ if (!$this->continuousBuffer) {
+ mcrypt_generic_init($this->demcrypt, $this->key, $this->iv);
+ }
+
+ return $this->mode != 'ctr' ? $this->_unpad($plaintext) : $plaintext;
+ }
+
+ return parent::decrypt($ciphertext);
+ }
+
+ /**
+ * Setup mcrypt
+ *
+ * Validates all the variables.
+ *
+ * @access private
+ */
+ function _mcryptSetup()
+ {
+ if (!$this->changed) {
+ return;
+ }
+
+ if (!$this->explicit_key_length) {
+ // this just copied from Crypt_Rijndael::_setup()
+ $length = strlen($this->key) >> 2;
+ if ($length > 8) {
+ $length = 8;
+ } else if ($length < 4) {
+ $length = 4;
+ }
+ $this->Nk = $length;
+ $this->key_size = $length << 2;
+ }
+
+ switch ($this->Nk) {
+ case 4: // 128
+ $this->key_size = 16;
+ break;
+ case 5: // 160
+ case 6: // 192
+ $this->key_size = 24;
+ break;
+ case 7: // 224
+ case 8: // 256
+ $this->key_size = 32;
+ }
+
+ $this->key = substr($this->key, 0, $this->key_size);
+ $this->encryptIV = $this->decryptIV = $this->iv = str_pad(substr($this->iv, 0, 16), 16, chr(0));
+
+ if (!isset($this->enmcrypt)) {
+ $mode = $this->mode;
+ //$mode = $this->mode == CRYPT_AES_MODE_CTR ? MCRYPT_MODE_ECB : $this->mode;
+
+ $this->demcrypt = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', $mode, '');
+ $this->enmcrypt = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', $mode, '');
+ } // else should mcrypt_generic_deinit be called?
+
+ mcrypt_generic_init($this->demcrypt, $this->key, $this->iv);
+ mcrypt_generic_init($this->enmcrypt, $this->key, $this->iv);
+
+ $this->changed = false;
+ }
+
+ /**
+ * Encrypts a block
+ *
+ * Optimized over Crypt_Rijndael's implementation by means of loop unrolling.
+ *
+ * @see Crypt_Rijndael::_encryptBlock()
+ * @access private
+ * @param String $in
+ * @return String
+ */
+ function _encryptBlock($in)
+ {
+ $state = unpack('N*word', $in);
+
+ $Nr = $this->Nr;
+ $w = $this->w;
+ $t0 = $this->t0;
+ $t1 = $this->t1;
+ $t2 = $this->t2;
+ $t3 = $this->t3;
+
+ // addRoundKey and reindex $state
+ $state = array(
+ $state['word1'] ^ $w[0][0],
+ $state['word2'] ^ $w[0][1],
+ $state['word3'] ^ $w[0][2],
+ $state['word4'] ^ $w[0][3]
+ );
+
+ // shiftRows + subWord + mixColumns + addRoundKey
+ // we could loop unroll this and use if statements to do more rounds as necessary, but, in my tests, that yields
+ // only a marginal improvement. since that also, imho, hinders the readability of the code, i've opted not to do it.
+ for ($round = 1; $round < $this->Nr; $round++) {
+ $state = array(
+ $t0[$state[0] & 0xFF000000] ^ $t1[$state[1] & 0x00FF0000] ^ $t2[$state[2] & 0x0000FF00] ^ $t3[$state[3] & 0x000000FF] ^ $w[$round][0],
+ $t0[$state[1] & 0xFF000000] ^ $t1[$state[2] & 0x00FF0000] ^ $t2[$state[3] & 0x0000FF00] ^ $t3[$state[0] & 0x000000FF] ^ $w[$round][1],
+ $t0[$state[2] & 0xFF000000] ^ $t1[$state[3] & 0x00FF0000] ^ $t2[$state[0] & 0x0000FF00] ^ $t3[$state[1] & 0x000000FF] ^ $w[$round][2],
+ $t0[$state[3] & 0xFF000000] ^ $t1[$state[0] & 0x00FF0000] ^ $t2[$state[1] & 0x0000FF00] ^ $t3[$state[2] & 0x000000FF] ^ $w[$round][3]
+ );
+
+ }
+
+ // subWord
+ $state = array(
+ $this->_subWord($state[0]),
+ $this->_subWord($state[1]),
+ $this->_subWord($state[2]),
+ $this->_subWord($state[3])
+ );
+
+ // shiftRows + addRoundKey
+ $state = array(
+ ($state[0] & 0xFF000000) ^ ($state[1] & 0x00FF0000) ^ ($state[2] & 0x0000FF00) ^ ($state[3] & 0x000000FF) ^ $this->w[$this->Nr][0],
+ ($state[1] & 0xFF000000) ^ ($state[2] & 0x00FF0000) ^ ($state[3] & 0x0000FF00) ^ ($state[0] & 0x000000FF) ^ $this->w[$this->Nr][1],
+ ($state[2] & 0xFF000000) ^ ($state[3] & 0x00FF0000) ^ ($state[0] & 0x0000FF00) ^ ($state[1] & 0x000000FF) ^ $this->w[$this->Nr][2],
+ ($state[3] & 0xFF000000) ^ ($state[0] & 0x00FF0000) ^ ($state[1] & 0x0000FF00) ^ ($state[2] & 0x000000FF) ^ $this->w[$this->Nr][3]
+ );
+
+ return pack('N*', $state[0], $state[1], $state[2], $state[3]);
+ }
+
+ /**
+ * Decrypts a block
+ *
+ * Optimized over Crypt_Rijndael's implementation by means of loop unrolling.
+ *
+ * @see Crypt_Rijndael::_decryptBlock()
+ * @access private
+ * @param String $in
+ * @return String
+ */
+ function _decryptBlock($in)
+ {
+ $state = unpack('N*word', $in);
+
+ $Nr = $this->Nr;
+ $dw = $this->dw;
+ $dt0 = $this->dt0;
+ $dt1 = $this->dt1;
+ $dt2 = $this->dt2;
+ $dt3 = $this->dt3;
+
+ // addRoundKey and reindex $state
+ $state = array(
+ $state['word1'] ^ $dw[$this->Nr][0],
+ $state['word2'] ^ $dw[$this->Nr][1],
+ $state['word3'] ^ $dw[$this->Nr][2],
+ $state['word4'] ^ $dw[$this->Nr][3]
+ );
+
+
+ // invShiftRows + invSubBytes + invMixColumns + addRoundKey
+ for ($round = $this->Nr - 1; $round > 0; $round--) {
+ $state = array(
+ $dt0[$state[0] & 0xFF000000] ^ $dt1[$state[3] & 0x00FF0000] ^ $dt2[$state[2] & 0x0000FF00] ^ $dt3[$state[1] & 0x000000FF] ^ $dw[$round][0],
+ $dt0[$state[1] & 0xFF000000] ^ $dt1[$state[0] & 0x00FF0000] ^ $dt2[$state[3] & 0x0000FF00] ^ $dt3[$state[2] & 0x000000FF] ^ $dw[$round][1],
+ $dt0[$state[2] & 0xFF000000] ^ $dt1[$state[1] & 0x00FF0000] ^ $dt2[$state[0] & 0x0000FF00] ^ $dt3[$state[3] & 0x000000FF] ^ $dw[$round][2],
+ $dt0[$state[3] & 0xFF000000] ^ $dt1[$state[2] & 0x00FF0000] ^ $dt2[$state[1] & 0x0000FF00] ^ $dt3[$state[0] & 0x000000FF] ^ $dw[$round][3]
+ );
+ }
+
+ // invShiftRows + invSubWord + addRoundKey
+ $state = array(
+ $this->_invSubWord(($state[0] & 0xFF000000) ^ ($state[3] & 0x00FF0000) ^ ($state[2] & 0x0000FF00) ^ ($state[1] & 0x000000FF)) ^ $dw[0][0],
+ $this->_invSubWord(($state[1] & 0xFF000000) ^ ($state[0] & 0x00FF0000) ^ ($state[3] & 0x0000FF00) ^ ($state[2] & 0x000000FF)) ^ $dw[0][1],
+ $this->_invSubWord(($state[2] & 0xFF000000) ^ ($state[1] & 0x00FF0000) ^ ($state[0] & 0x0000FF00) ^ ($state[3] & 0x000000FF)) ^ $dw[0][2],
+ $this->_invSubWord(($state[3] & 0xFF000000) ^ ($state[2] & 0x00FF0000) ^ ($state[1] & 0x0000FF00) ^ ($state[0] & 0x000000FF)) ^ $dw[0][3]
+ );
+
+ return pack('N*', $state[0], $state[1], $state[2], $state[3]);
+ }
+}
+
+// vim: ts=4:sw=4:et:
+// vim6: fdl=1:
\ No newline at end of file diff --git a/phpsec/Crypt/DES.php b/phpsec/Crypt/DES.php new file mode 100644 index 000000000..431ad539b --- /dev/null +++ b/phpsec/Crypt/DES.php @@ -0,0 +1,945 @@ +<?php
+/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
+
+/**
+ * Pure-PHP implementation of DES.
+ *
+ * Uses mcrypt, if available, and an internal implementation, otherwise.
+ *
+ * PHP versions 4 and 5
+ *
+ * Useful resources are as follows:
+ *
+ * - {@link http://en.wikipedia.org/wiki/DES_supplementary_material Wikipedia: DES supplementary material}
+ * - {@link http://www.itl.nist.gov/fipspubs/fip46-2.htm FIPS 46-2 - (DES), Data Encryption Standard}
+ * - {@link http://www.cs.eku.edu/faculty/styer/460/Encrypt/JS-DES.html JavaScript DES Example}
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ * include('Crypt/DES.php');
+ *
+ * $des = new Crypt_DES();
+ *
+ * $des->setKey('abcdefgh');
+ *
+ * $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_DES
+ * @author Jim Wigginton <terrafrost@php.net>
+ * @copyright MMVII Jim Wigginton
+ * @license http://www.gnu.org/licenses/lgpl.txt
+ * @version $Id: DES.php,v 1.12 2010/02/09 06:10:26 terrafrost Exp $
+ * @link http://phpseclib.sourceforge.net
+ */
+
+/**#@+
+ * @access private
+ * @see Crypt_DES::_prepareKey()
+ * @see Crypt_DES::_processBlock()
+ */
+/**
+ * Contains array_reverse($keys[CRYPT_DES_DECRYPT])
+ */
+define('CRYPT_DES_ENCRYPT', 0);
+/**
+ * Contains array_reverse($keys[CRYPT_DES_ENCRYPT])
+ */
+define('CRYPT_DES_DECRYPT', 1);
+/**#@-*/
+
+/**#@+
+ * @access public
+ * @see Crypt_DES::encrypt()
+ * @see Crypt_DES::decrypt()
+ */
+/**
+ * Encrypt / decrypt using the Counter mode.
+ *
+ * Set to -1 since that's what Crypt/Random.php uses to index the CTR mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Counter_.28CTR.29
+ */
+define('CRYPT_DES_MODE_CTR', -1);
+/**
+ * Encrypt / decrypt using the Electronic Code Book mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29
+ */
+define('CRYPT_DES_MODE_ECB', 1);
+/**
+ * Encrypt / decrypt using the Code Book Chaining mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher-block_chaining_.28CBC.29
+ */
+define('CRYPT_DES_MODE_CBC', 2);
+/**#@-*/
+
+/**#@+
+ * @access private
+ * @see Crypt_DES::Crypt_DES()
+ */
+/**
+ * Toggles the internal implementation
+ */
+define('CRYPT_DES_MODE_INTERNAL', 1);
+/**
+ * Toggles the mcrypt implementation
+ */
+define('CRYPT_DES_MODE_MCRYPT', 2);
+/**#@-*/
+
+/**
+ * Pure-PHP implementation of DES.
+ *
+ * @author Jim Wigginton <terrafrost@php.net>
+ * @version 0.1.0
+ * @access public
+ * @package Crypt_DES
+ */
+class Crypt_DES {
+ /**
+ * The Key Schedule
+ *
+ * @see Crypt_DES::setKey()
+ * @var Array
+ * @access private
+ */
+ var $keys = "\0\0\0\0\0\0\0\0";
+
+ /**
+ * The Encryption Mode
+ *
+ * @see Crypt_DES::Crypt_DES()
+ * @var Integer
+ * @access private
+ */
+ var $mode;
+
+ /**
+ * Continuous Buffer status
+ *
+ * @see Crypt_DES::enableContinuousBuffer()
+ * @var Boolean
+ * @access private
+ */
+ var $continuousBuffer = false;
+
+ /**
+ * Padding status
+ *
+ * @see Crypt_DES::enablePadding()
+ * @var Boolean
+ * @access private
+ */
+ var $padding = true;
+
+ /**
+ * The Initialization Vector
+ *
+ * @see Crypt_DES::setIV()
+ * @var String
+ * @access private
+ */
+ var $iv = "\0\0\0\0\0\0\0\0";
+
+ /**
+ * A "sliding" Initialization Vector
+ *
+ * @see Crypt_DES::enableContinuousBuffer()
+ * @var String
+ * @access private
+ */
+ var $encryptIV = "\0\0\0\0\0\0\0\0";
+
+ /**
+ * A "sliding" Initialization Vector
+ *
+ * @see Crypt_DES::enableContinuousBuffer()
+ * @var String
+ * @access private
+ */
+ var $decryptIV = "\0\0\0\0\0\0\0\0";
+
+ /**
+ * 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 $mode
+ * @return Crypt_DES
+ * @access public
+ */
+ function Crypt_DES($mode = CRYPT_MODE_DES_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);
+ }
+ }
+
+ 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:
+ $this->mode = 'ctr';
+ //$this->mode = in_array('ctr', mcrypt_list_modes()) ? 'ctr' : CRYPT_DES_MODE_CTR;
+ break;
+ case CRYPT_DES_MODE_CBC:
+ default:
+ $this->mode = MCRYPT_MODE_CBC;
+ }
+
+ break;
+ default:
+ switch ($mode) {
+ case CRYPT_DES_MODE_ECB:
+ case CRYPT_DES_MODE_CTR:
+ case CRYPT_DES_MODE_CBC:
+ $this->mode = $mode;
+ break;
+ default:
+ $this->mode = CRYPT_DES_MODE_CBC;
+ }
+ }
+ }
+
+ /**
+ * Sets the key.
+ *
+ * Keys can be of any length. DES, itself, uses 64-bit keys (eg. strlen($key) == 8), however, we
+ * only use the first eight, if $key has more then eight characters in it, and pad $key with the
+ * null byte if it is less then eight characters long.
+ *
+ * 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)
+ {
+ $this->keys = ( CRYPT_DES_MODE == CRYPT_DES_MODE_MCRYPT ) ? substr($key, 0, 8) : $this->_prepareKey($key);
+ $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));
+ $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.
+ *
+ * $plaintext will be padded with up to 8 additional bytes. Other DES implementations may or may not pad in the
+ * same manner. Other common approaches to padding and the reasons why it's necessary are discussed in the following
+ * URL:
+ *
+ * {@link http://www.di-mgt.com.au/cryptopad.html http://www.di-mgt.com.au/cryptopad.html}
+ *
+ * An alternative to padding is to, separately, send the length of the file. This is what SSH, in fact, does.
+ * strlen($plaintext) will still need to be a multiple of 8, however, arbitrary values can be added to make it that
+ * length.
+ *
+ * @see Crypt_DES::decrypt()
+ * @access public
+ * @param String $plaintext
+ */
+ function encrypt($plaintext)
+ {
+ if ($this->mode != CRYPT_DES_MODE_CTR && $this->mode != 'ctr') {
+ $plaintext = $this->_pad($plaintext);
+ }
+
+ if ( CRYPT_DES_MODE == CRYPT_DES_MODE_MCRYPT ) {
+ if ($this->changed) {
+ if (!isset($this->enmcrypt)) {
+ $this->enmcrypt = mcrypt_module_open(MCRYPT_DES, '', $this->mode, '');
+ }
+ mcrypt_generic_init($this->enmcrypt, $this->keys, $this->encryptIV);
+ $this->changed = false;
+ }
+
+ $ciphertext = mcrypt_generic($this->enmcrypt, $plaintext);
+
+ if (!$this->continuousBuffer) {
+ mcrypt_generic_init($this->enmcrypt, $this->keys, $this->encryptIV);
+ }
+
+ return $ciphertext;
+ }
+
+ if (!is_array($this->keys)) {
+ $this->keys = $this->_prepareKey("\0\0\0\0\0\0\0\0");
+ }
+
+ $ciphertext = '';
+ switch ($this->mode) {
+ case CRYPT_DES_MODE_ECB:
+ for ($i = 0; $i < strlen($plaintext); $i+=8) {
+ $ciphertext.= $this->_processBlock(substr($plaintext, $i, 8), CRYPT_DES_ENCRYPT);
+ }
+ break;
+ case CRYPT_DES_MODE_CBC:
+ $xor = $this->encryptIV;
+ for ($i = 0; $i < strlen($plaintext); $i+=8) {
+ $block = substr($plaintext, $i, 8);
+ $block = $this->_processBlock($block ^ $xor, 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) {
+ $block = substr($plaintext, $i, 8);
+ $key = $this->_processBlock($this->_generate_xor(8, $xor), CRYPT_DES_ENCRYPT);
+ $ciphertext.= $block ^ $key;
+ }
+ if ($this->continuousBuffer) {
+ $this->encryptIV = $xor;
+ }
+ }
+
+ return $ciphertext;
+ }
+
+ /**
+ * Decrypts a message.
+ *
+ * If strlen($ciphertext) is not a multiple of 8, null bytes will be added to the end of the string until it is.
+ *
+ * @see Crypt_DES::encrypt()
+ * @access public
+ * @param String $ciphertext
+ */
+ function decrypt($ciphertext)
+ {
+ if ($this->mode != CRYPT_DES_MODE_CTR && $this->mode != 'ctr') {
+ // 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_DES, '', $this->mode, '');
+ }
+ mcrypt_generic_init($this->demcrypt, $this->keys, $this->decryptIV);
+ $this->changed = false;
+ }
+
+ $plaintext = mdecrypt_generic($this->demcrypt, $ciphertext);
+
+ if (!$this->continuousBuffer) {
+ mcrypt_generic_init($this->demcrypt, $this->keys, $this->decryptIV);
+ }
+
+ return $this->mode != 'ctr' ? $this->_unpad($plaintext) : $plaintext;
+ }
+
+ if (!is_array($this->keys)) {
+ $this->keys = $this->_prepareKey("\0\0\0\0\0\0\0\0");
+ }
+
+ $plaintext = '';
+ switch ($this->mode) {
+ case CRYPT_DES_MODE_ECB:
+ for ($i = 0; $i < strlen($ciphertext); $i+=8) {
+ $plaintext.= $this->_processBlock(substr($ciphertext, $i, 8), CRYPT_DES_DECRYPT);
+ }
+ break;
+ case CRYPT_DES_MODE_CBC:
+ $xor = $this->decryptIV;
+ for ($i = 0; $i < strlen($ciphertext); $i+=8) {
+ $block = substr($ciphertext, $i, 8);
+ $plaintext.= $this->_processBlock($block, CRYPT_DES_DECRYPT) ^ $xor;
+ $xor = $block;
+ }
+ if ($this->continuousBuffer) {
+ $this->decryptIV = $xor;
+ }
+ break;
+ case CRYPT_DES_MODE_CTR:
+ $xor = $this->decryptIV;
+ for ($i = 0; $i < strlen($ciphertext); $i+=8) {
+ $block = substr($ciphertext, $i, 8);
+ $key = $this->_processBlock($this->_generate_xor(8, $xor), CRYPT_DES_ENCRYPT);
+ $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_DES::disableContinuousBuffer()
+ * @access public
+ */
+ function enableContinuousBuffer()
+ {
+ $this->continuousBuffer = true;
+ }
+
+ /**
+ * Treat consecutive packets as if they are a discontinuous buffer.
+ *
+ * The default behavior.
+ *
+ * @see Crypt_DES::enableContinuousBuffer()
+ * @access public
+ */
+ function disableContinuousBuffer()
+ {
+ $this->continuousBuffer = false;
+ $this->encryptIV = $this->iv;
+ $this->decryptIV = $this->iv;
+ }
+
+ /**
+ * 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_DES::disablePadding()
+ * @access public
+ */
+ function enablePadding()
+ {
+ $this->padding = true;
+ }
+
+ /**
+ * Do not pad packets.
+ *
+ * @see Crypt_DES::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 $text is not a multiple of the blocksize, the string will be padded regardless
+ * and padding will, hence forth, be enabled.
+ *
+ * @see Crypt_DES::_unpad()
+ * @access private
+ */
+ function _pad($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_DES::_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);
+ }
+
+ /**
+ * Encrypts or decrypts a 64-bit block
+ *
+ * $mode should be either CRYPT_DES_ENCRYPT or CRYPT_DES_DECRYPT. See
+ * {@link http://en.wikipedia.org/wiki/Image:Feistel.png Feistel.png} to get a general
+ * idea of what this function does.
+ *
+ * @access private
+ * @param String $block
+ * @param Integer $mode
+ * @return String
+ */
+ function _processBlock($block, $mode)
+ {
+ // s-boxes. in the official DES docs, they're described as being matrices that
+ // one accesses by using the first and last bits to determine the row and the
+ // middle four bits to determine the column. in this implementation, they've
+ // been converted to vectors
+ static $sbox = array(
+ array(
+ 14, 0, 4, 15, 13, 7, 1, 4, 2, 14, 15, 2, 11, 13, 8, 1,
+ 3, 10 ,10, 6, 6, 12, 12, 11, 5, 9, 9, 5, 0, 3, 7, 8,
+ 4, 15, 1, 12, 14, 8, 8, 2, 13, 4, 6, 9, 2, 1, 11, 7,
+ 15, 5, 12, 11, 9, 3, 7, 14, 3, 10, 10, 0, 5, 6, 0, 13
+ ),
+ array(
+ 15, 3, 1, 13, 8, 4, 14, 7, 6, 15, 11, 2, 3, 8, 4, 14,
+ 9, 12, 7, 0, 2, 1, 13, 10, 12, 6, 0, 9, 5, 11, 10, 5,
+ 0, 13, 14, 8, 7, 10, 11, 1, 10, 3, 4, 15, 13, 4, 1, 2,
+ 5, 11, 8, 6, 12, 7, 6, 12, 9, 0, 3, 5, 2, 14, 15, 9
+ ),
+ array(
+ 10, 13, 0, 7, 9, 0, 14, 9, 6, 3, 3, 4, 15, 6, 5, 10,
+ 1, 2, 13, 8, 12, 5, 7, 14, 11, 12, 4, 11, 2, 15, 8, 1,
+ 13, 1, 6, 10, 4, 13, 9, 0, 8, 6, 15, 9, 3, 8, 0, 7,
+ 11, 4, 1, 15, 2, 14, 12, 3, 5, 11, 10, 5, 14, 2, 7, 12
+ ),
+ array(
+ 7, 13, 13, 8, 14, 11, 3, 5, 0, 6, 6, 15, 9, 0, 10, 3,
+ 1, 4, 2, 7, 8, 2, 5, 12, 11, 1, 12, 10, 4, 14, 15, 9,
+ 10, 3, 6, 15, 9, 0, 0, 6, 12, 10, 11, 1, 7, 13, 13, 8,
+ 15, 9, 1, 4, 3, 5, 14, 11, 5, 12, 2, 7, 8, 2, 4, 14
+ ),
+ array(
+ 2, 14, 12, 11, 4, 2, 1, 12, 7, 4, 10, 7, 11, 13, 6, 1,
+ 8, 5, 5, 0, 3, 15, 15, 10, 13, 3, 0, 9, 14, 8, 9, 6,
+ 4, 11, 2, 8, 1, 12, 11, 7, 10, 1, 13, 14, 7, 2, 8, 13,
+ 15, 6, 9, 15, 12, 0, 5, 9, 6, 10, 3, 4, 0, 5, 14, 3
+ ),
+ array(
+ 12, 10, 1, 15, 10, 4, 15, 2, 9, 7, 2, 12, 6, 9, 8, 5,
+ 0, 6, 13, 1, 3, 13, 4, 14, 14, 0, 7, 11, 5, 3, 11, 8,
+ 9, 4, 14, 3, 15, 2, 5, 12, 2, 9, 8, 5, 12, 15, 3, 10,
+ 7, 11, 0, 14, 4, 1, 10, 7, 1, 6, 13, 0, 11, 8, 6, 13
+ ),
+ array(
+ 4, 13, 11, 0, 2, 11, 14, 7, 15, 4, 0, 9, 8, 1, 13, 10,
+ 3, 14, 12, 3, 9, 5, 7, 12, 5, 2, 10, 15, 6, 8, 1, 6,
+ 1, 6, 4, 11, 11, 13, 13, 8, 12, 1, 3, 4, 7, 10, 14, 7,
+ 10, 9, 15, 5, 6, 0, 8, 15, 0, 14, 5, 2, 9, 3, 2, 12
+ ),
+ array(
+ 13, 1, 2, 15, 8, 13, 4, 8, 6, 10, 15, 3, 11, 7, 1, 4,
+ 10, 12, 9, 5, 3, 6, 14, 11, 5, 0, 0, 14, 12, 9, 7, 2,
+ 7, 2, 11, 1, 4, 14, 1, 7, 9, 4, 12, 10, 14, 8, 2, 13,
+ 0, 15, 6, 12, 10, 9, 13, 0, 15, 3, 3, 5, 5, 6, 8, 11
+ )
+ );
+
+ $keys = $this->keys;
+
+ $temp = unpack('Na/Nb', $block);
+ $block = array($temp['a'], $temp['b']);
+
+ // because php does arithmetic right shifts, if the most significant bits are set, right
+ // shifting those into the correct position will add 1's - not 0's. this will intefere
+ // with the | operation unless a second & is done. so we isolate these bits and left shift
+ // them into place. we then & each block with 0x7FFFFFFF to prevennt 1's from being added
+ // for any other shifts.
+ $msb = array(
+ ($block[0] >> 31) & 1,
+ ($block[1] >> 31) & 1
+ );
+ $block[0] &= 0x7FFFFFFF;
+ $block[1] &= 0x7FFFFFFF;
+
+ // we isolate the appropriate bit in the appropriate integer and shift as appropriate. in
+ // some cases, there are going to be multiple bits in the same integer that need to be shifted
+ // in the same way. we combine those into one shift operation.
+ $block = array(
+ (($block[1] & 0x00000040) << 25) | (($block[1] & 0x00004000) << 16) |
+ (($block[1] & 0x00400001) << 7) | (($block[1] & 0x40000100) >> 2) |
+ (($block[0] & 0x00000040) << 21) | (($block[0] & 0x00004000) << 12) |
+ (($block[0] & 0x00400001) << 3) | (($block[0] & 0x40000100) >> 6) |
+ (($block[1] & 0x00000010) << 19) | (($block[1] & 0x00001000) << 10) |
+ (($block[1] & 0x00100000) << 1) | (($block[1] & 0x10000000) >> 8) |
+ (($block[0] & 0x00000010) << 15) | (($block[0] & 0x00001000) << 6) |
+ (($block[0] & 0x00100000) >> 3) | (($block[0] & 0x10000000) >> 12) |
+ (($block[1] & 0x00000004) << 13) | (($block[1] & 0x00000400) << 4) |
+ (($block[1] & 0x00040000) >> 5) | (($block[1] & 0x04000000) >> 14) |
+ (($block[0] & 0x00000004) << 9) | ( $block[0] & 0x00000400 ) |
+ (($block[0] & 0x00040000) >> 9) | (($block[0] & 0x04000000) >> 18) |
+ (($block[1] & 0x00010000) >> 11) | (($block[1] & 0x01000000) >> 20) |
+ (($block[0] & 0x00010000) >> 15) | (($block[0] & 0x01000000) >> 24)
+ ,
+ (($block[1] & 0x00000080) << 24) | (($block[1] & 0x00008000) << 15) |
+ (($block[1] & 0x00800002) << 6) | (($block[0] & 0x00000080) << 20) |
+ (($block[0] & 0x00008000) << 11) | (($block[0] & 0x00800002) << 2) |
+ (($block[1] & 0x00000020) << 18) | (($block[1] & 0x00002000) << 9) |
+ ( $block[1] & 0x00200000 ) | (($block[1] & 0x20000000) >> 9) |
+ (($block[0] & 0x00000020) << 14) | (($block[0] & 0x00002000) << 5) |
+ (($block[0] & 0x00200000) >> 4) | (($block[0] & 0x20000000) >> 13) |
+ (($block[1] & 0x00000008) << 12) | (($block[1] & 0x00000800) << 3) |
+ (($block[1] & 0x00080000) >> 6) | (($block[1] & 0x08000000) >> 15) |
+ (($block[0] & 0x00000008) << 8) | (($block[0] & 0x00000800) >> 1) |
+ (($block[0] & 0x00080000) >> 10) | (($block[0] & 0x08000000) >> 19) |
+ (($block[1] & 0x00000200) >> 3) | (($block[0] & 0x00000200) >> 7) |
+ (($block[1] & 0x00020000) >> 12) | (($block[1] & 0x02000000) >> 21) |
+ (($block[0] & 0x00020000) >> 16) | (($block[0] & 0x02000000) >> 25) |
+ ($msb[1] << 28) | ($msb[0] << 24)
+ );
+
+ for ($i = 0; $i < 16; $i++) {
+ // start of "the Feistel (F) function" - see the following URL:
+ // http://en.wikipedia.org/wiki/Image:Data_Encryption_Standard_InfoBox_Diagram.png
+ $temp = (($sbox[0][((($block[1] >> 27) & 0x1F) | (($block[1] & 1) << 5)) ^ $keys[$mode][$i][0]]) << 28)
+ | (($sbox[1][(($block[1] & 0x1F800000) >> 23) ^ $keys[$mode][$i][1]]) << 24)
+ | (($sbox[2][(($block[1] & 0x01F80000) >> 19) ^ $keys[$mode][$i][2]]) << 20)
+ | (($sbox[3][(($block[1] & 0x001F8000) >> 15) ^ $keys[$mode][$i][3]]) << 16)
+ | (($sbox[4][(($block[1] & 0x0001F800) >> 11) ^ $keys[$mode][$i][4]]) << 12)
+ | (($sbox[5][(($block[1] & 0x00001F80) >> 7) ^ $keys[$mode][$i][5]]) << 8)
+ | (($sbox[6][(($block[1] & 0x000001F8) >> 3) ^ $keys[$mode][$i][6]]) << 4)
+ | ( $sbox[7][((($block[1] & 0x1F) << 1) | (($block[1] >> 31) & 1)) ^ $keys[$mode][$i][7]]);
+
+ $msb = ($temp >> 31) & 1;
+ $temp &= 0x7FFFFFFF;
+ $newBlock = (($temp & 0x00010000) << 15) | (($temp & 0x02020120) << 5)
+ | (($temp & 0x00001800) << 17) | (($temp & 0x01000000) >> 10)
+ | (($temp & 0x00000008) << 24) | (($temp & 0x00100000) << 6)
+ | (($temp & 0x00000010) << 21) | (($temp & 0x00008000) << 9)
+ | (($temp & 0x00000200) << 12) | (($temp & 0x10000000) >> 27)
+ | (($temp & 0x00000040) << 14) | (($temp & 0x08000000) >> 8)
+ | (($temp & 0x00004000) << 4) | (($temp & 0x00000002) << 16)
+ | (($temp & 0x00442000) >> 6) | (($temp & 0x40800000) >> 15)
+ | (($temp & 0x00000001) << 11) | (($temp & 0x20000000) >> 20)
+ | (($temp & 0x00080000) >> 13) | (($temp & 0x00000004) << 3)
+ | (($temp & 0x04000000) >> 22) | (($temp & 0x00000480) >> 7)
+ | (($temp & 0x00200000) >> 19) | ($msb << 23);
+ // end of "the Feistel (F) function" - $newBlock is F's output
+
+ $temp = $block[1];
+ $block[1] = $block[0] ^ $newBlock;
+ $block[0] = $temp;
+ }
+
+ $msb = array(
+ ($block[0] >> 31) & 1,
+ ($block[1] >> 31) & 1
+ );
+ $block[0] &= 0x7FFFFFFF;
+ $block[1] &= 0x7FFFFFFF;
+
+ $block = array(
+ (($block[0] & 0x01000004) << 7) | (($block[1] & 0x01000004) << 6) |
+ (($block[0] & 0x00010000) << 13) | (($block[1] & 0x00010000) << 12) |
+ (($block[0] & 0x00000100) << 19) | (($block[1] & 0x00000100) << 18) |
+ (($block[0] & 0x00000001) << 25) | (($block[1] & 0x00000001) << 24) |
+ (($block[0] & 0x02000008) >> 2) | (($block[1] & 0x02000008) >> 3) |
+ (($block[0] & 0x00020000) << 4) | (($block[1] & 0x00020000) << 3) |
+ (($block[0] & 0x00000200) << 10) | (($block[1] & 0x00000200) << 9) |
+ (($block[0] & 0x00000002) << 16) | (($block[1] & 0x00000002) << 15) |
+ (($block[0] & 0x04000000) >> 11) | (($block[1] & 0x04000000) >> 12) |
+ (($block[0] & 0x00040000) >> 5) | (($block[1] & 0x00040000) >> 6) |
+ (($block[0] & 0x00000400) << 1) | ( $block[1] & 0x00000400 ) |
+ (($block[0] & 0x08000000) >> 20) | (($block[1] & 0x08000000) >> 21) |
+ (($block[0] & 0x00080000) >> 14) | (($block[1] & 0x00080000) >> 15) |
+ (($block[0] & 0x00000800) >> 8) | (($block[1] & 0x00000800) >> 9)
+ ,
+ (($block[0] & 0x10000040) << 3) | (($block[1] & 0x10000040) << 2) |
+ (($block[0] & 0x00100000) << 9) | (($block[1] & 0x00100000) << 8) |
+ (($block[0] & 0x00001000) << 15) | (($block[1] & 0x00001000) << 14) |
+ (($block[0] & 0x00000010) << 21) | (($block[1] & 0x00000010) << 20) |
+ (($block[0] & 0x20000080) >> 6) | (($block[1] & 0x20000080) >> 7) |
+ ( $block[0] & 0x00200000 ) | (($block[1] & 0x00200000) >> 1) |
+ (($block[0] & 0x00002000) << 6) | (($block[1] & 0x00002000) << 5) |
+ (($block[0] & 0x00000020) << 12) | (($block[1] & 0x00000020) << 11) |
+ (($block[0] & 0x40000000) >> 15) | (($block[1] & 0x40000000) >> 16) |
+ (($block[0] & 0x00400000) >> 9) | (($block[1] & 0x00400000) >> 10) |
+ (($block[0] & 0x00004000) >> 3) | (($block[1] & 0x00004000) >> 4) |
+ (($block[0] & 0x00800000) >> 18) | (($block[1] & 0x00800000) >> 19) |
+ (($block[0] & 0x00008000) >> 12) | (($block[1] & 0x00008000) >> 13) |
+ ($msb[0] << 7) | ($msb[1] << 6)
+ );
+
+ return pack('NN', $block[0], $block[1]);
+ }
+
+ /**
+ * Creates the key schedule.
+ *
+ * @access private
+ * @param String $key
+ * @return Array
+ */
+ function _prepareKey($key)
+ {
+ static $shifts = array( // number of key bits shifted per round
+ 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1
+ );
+
+ // pad the key and remove extra characters as appropriate.
+ $key = str_pad(substr($key, 0, 8), 8, chr(0));
+
+ $temp = unpack('Na/Nb', $key);
+ $key = array($temp['a'], $temp['b']);
+ $msb = array(
+ ($key[0] >> 31) & 1,
+ ($key[1] >> 31) & 1
+ );
+ $key[0] &= 0x7FFFFFFF;
+ $key[1] &= 0x7FFFFFFF;
+
+ $key = array(
+ (($key[1] & 0x00000002) << 26) | (($key[1] & 0x00000204) << 17) |
+ (($key[1] & 0x00020408) << 8) | (($key[1] & 0x02040800) >> 1) |
+ (($key[0] & 0x00000002) << 22) | (($key[0] & 0x00000204) << 13) |
+ (($key[0] & 0x00020408) << 4) | (($key[0] & 0x02040800) >> 5) |
+ (($key[1] & 0x04080000) >> 10) | (($key[0] & 0x04080000) >> 14) |
+ (($key[1] & 0x08000000) >> 19) | (($key[0] & 0x08000000) >> 23) |
+ (($key[0] & 0x00000010) >> 1) | (($key[0] & 0x00001000) >> 10) |
+ (($key[0] & 0x00100000) >> 19) | (($key[0] & 0x10000000) >> 28)
+ ,
+ (($key[1] & 0x00000080) << 20) | (($key[1] & 0x00008000) << 11) |
+ (($key[1] & 0x00800000) << 2) | (($key[0] & 0x00000080) << 16) |
+ (($key[0] & 0x00008000) << 7) | (($key[0] & 0x00800000) >> 2) |
+ (($key[1] & 0x00000040) << 13) | (($key[1] & 0x00004000) << 4) |
+ (($key[1] & 0x00400000) >> 5) | (($key[1] & 0x40000000) >> 14) |
+ (($key[0] & 0x00000040) << 9) | ( $key[0] & 0x00004000 ) |
+ (($key[0] & 0x00400000) >> 9) | (($key[0] & 0x40000000) >> 18) |
+ (($key[1] & 0x00000020) << 6) | (($key[1] & 0x00002000) >> 3) |
+ (($key[1] & 0x00200000) >> 12) | (($key[1] & 0x20000000) >> 21) |
+ (($key[0] & 0x00000020) << 2) | (($key[0] & 0x00002000) >> 7) |
+ (($key[0] & 0x00200000) >> 16) | (($key[0] & 0x20000000) >> 25) |
+ (($key[1] & 0x00000010) >> 1) | (($key[1] & 0x00001000) >> 10) |
+ (($key[1] & 0x00100000) >> 19) | (($key[1] & 0x10000000) >> 28) |
+ ($msb[1] << 24) | ($msb[0] << 20)
+ );
+
+ $keys = array();
+ for ($i = 0; $i < 16; $i++) {
+ $key[0] <<= $shifts[$i];
+ $temp = ($key[0] & 0xF0000000) >> 28;
+ $key[0] = ($key[0] | $temp) & 0x0FFFFFFF;
+
+ $key[1] <<= $shifts[$i];
+ $temp = ($key[1] & 0xF0000000) >> 28;
+ $key[1] = ($key[1] | $temp) & 0x0FFFFFFF;
+
+ $temp = array(
+ (($key[1] & 0x00004000) >> 9) | (($key[1] & 0x00000800) >> 7) |
+ (($key[1] & 0x00020000) >> 14) | (($key[1] & 0x00000010) >> 2) |
+ (($key[1] & 0x08000000) >> 26) | (($key[1] & 0x00800000) >> 23)
+ ,
+ (($key[1] & 0x02400000) >> 20) | (($key[1] & 0x00000001) << 4) |
+ (($key[1] & 0x00002000) >> 10) | (($key[1] & 0x00040000) >> 18) |
+ (($key[1] & 0x00000080) >> 6)
+ ,
+ ( $key[1] & 0x00000020 ) | (($key[1] & 0x00000200) >> 5) |
+ (($key[1] & 0x00010000) >> 13) | (($key[1] & 0x01000000) >> 22) |
+ (($key[1] & 0x00000004) >> 1) | (($key[1] & 0x00100000) >> 20)
+ ,
+ (($key[1] & 0x00001000) >> 7) | (($key[1] & 0x00200000) >> 17) |
+ (($key[1] & 0x00000002) << 2) | (($key[1] & 0x00000100) >> 6) |
+ (($key[1] & 0x00008000) >> 14) | (($key[1] & 0x04000000) >> 26)
+ ,
+ (($key[0] & 0x00008000) >> 10) | ( $key[0] & 0x00000010 ) |
+ (($key[0] & 0x02000000) >> 22) | (($key[0] & 0x00080000) >> 17) |
+ (($key[0] & 0x00000200) >> 8) | (($key[0] & 0x00000002) >> 1)
+ ,
+ (($key[0] & 0x04000000) >> 21) | (($key[0] & 0x00010000) >> 12) |
+ (($key[0] & 0x00000020) >> 2) | (($key[0] & 0x00000800) >> 9) |
+ (($key[0] & 0x00800000) >> 22) | (($key[0] & 0x00000100) >> 8)
+ ,
+ (($key[0] & 0x00001000) >> 7) | (($key[0] & 0x00000088) >> 3) |
+ (($key[0] & 0x00020000) >> 14) | (($key[0] & 0x00000001) << 2) |
+ (($key[0] & 0x00400000) >> 21)
+ ,
+ (($key[0] & 0x00000400) >> 5) | (($key[0] & 0x00004000) >> 10) |
+ (($key[0] & 0x00000040) >> 3) | (($key[0] & 0x00100000) >> 18) |
+ (($key[0] & 0x08000000) >> 26) | (($key[0] & 0x01000000) >> 24)
+ );
+
+ $keys[] = $temp;
+ }
+
+ $temp = array(
+ CRYPT_DES_ENCRYPT => $keys,
+ CRYPT_DES_DECRYPT => array_reverse($keys)
+ );
+
+ return $temp;
+ }
+}
+
+// vim: ts=4:sw=4:et:
+// vim6: fdl=1:
\ No newline at end of file diff --git a/phpsec/Crypt/Hash.php b/phpsec/Crypt/Hash.php new file mode 100644 index 000000000..ef3a85802 --- /dev/null +++ b/phpsec/Crypt/Hash.php @@ -0,0 +1,816 @@ +<?php
+/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
+
+/**
+ * Pure-PHP implementations of keyed-hash message authentication codes (HMACs) and various cryptographic hashing functions.
+ *
+ * Uses hash() or mhash() if available and an internal implementation, otherwise. Currently supports the following:
+ *
+ * md2, md5, md5-96, sha1, sha1-96, sha256, sha384, and sha512
+ *
+ * If {@link Crypt_Hash::setKey() setKey()} is called, {@link Crypt_Hash::hash() hash()} will return the HMAC as opposed to
+ * the hash. If no valid algorithm is provided, sha1 will be used.
+ *
+ * PHP versions 4 and 5
+ *
+ * {@internal The variable names are the same as those in
+ * {@link http://tools.ietf.org/html/rfc2104#section-2 RFC2104}.}}
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ * include('Crypt/Hash.php');
+ *
+ * $hash = new Crypt_Hash('sha1');
+ *
+ * $hash->setKey('abcdefg');
+ *
+ * echo base64_encode($hash->hash('abcdefg'));
+ * ?>
+ * </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_Hash
+ * @author Jim Wigginton <terrafrost@php.net>
+ * @copyright MMVII Jim Wigginton
+ * @license http://www.gnu.org/licenses/lgpl.txt
+ * @version $Id: Hash.php,v 1.6 2009/11/23 23:37:07 terrafrost Exp $
+ * @link http://phpseclib.sourceforge.net
+ */
+
+/**#@+
+ * @access private
+ * @see Crypt_Hash::Crypt_Hash()
+ */
+/**
+ * Toggles the internal implementation
+ */
+define('CRYPT_HASH_MODE_INTERNAL', 1);
+/**
+ * Toggles the mhash() implementation, which has been deprecated on PHP 5.3.0+.
+ */
+define('CRYPT_HASH_MODE_MHASH', 2);
+/**
+ * Toggles the hash() implementation, which works on PHP 5.1.2+.
+ */
+define('CRYPT_HASH_MODE_HASH', 3);
+/**#@-*/
+
+/**
+ * Pure-PHP implementations of keyed-hash message authentication codes (HMACs) and various cryptographic hashing functions.
+ *
+ * @author Jim Wigginton <terrafrost@php.net>
+ * @version 0.1.0
+ * @access public
+ * @package Crypt_Hash
+ */
+class Crypt_Hash {
+ /**
+ * Byte-length of compression blocks / key (Internal HMAC)
+ *
+ * @see Crypt_Hash::setAlgorithm()
+ * @var Integer
+ * @access private
+ */
+ var $b;
+
+ /**
+ * Byte-length of hash output (Internal HMAC)
+ *
+ * @see Crypt_Hash::setHash()
+ * @var Integer
+ * @access private
+ */
+ var $l = false;
+
+ /**
+ * Hash Algorithm
+ *
+ * @see Crypt_Hash::setHash()
+ * @var String
+ * @access private
+ */
+ var $hash;
+
+ /**
+ * Key
+ *
+ * @see Crypt_Hash::setKey()
+ * @var String
+ * @access private
+ */
+ var $key = '';
+
+ /**
+ * Outer XOR (Internal HMAC)
+ *
+ * @see Crypt_Hash::setKey()
+ * @var String
+ * @access private
+ */
+ var $opad;
+
+ /**
+ * Inner XOR (Internal HMAC)
+ *
+ * @see Crypt_Hash::setKey()
+ * @var String
+ * @access private
+ */
+ var $ipad;
+
+ /**
+ * Default Constructor.
+ *
+ * @param optional String $hash
+ * @return Crypt_Hash
+ * @access public
+ */
+ function Crypt_Hash($hash = 'sha1')
+ {
+ if ( !defined('CRYPT_HASH_MODE') ) {
+ switch (true) {
+ case extension_loaded('hash'):
+ define('CRYPT_HASH_MODE', CRYPT_HASH_MODE_HASH);
+ break;
+ case extension_loaded('mhash'):
+ define('CRYPT_HASH_MODE', CRYPT_HASH_MODE_MHASH);
+ break;
+ default:
+ define('CRYPT_HASH_MODE', CRYPT_HASH_MODE_INTERNAL);
+ }
+ }
+
+ $this->setHash($hash);
+ }
+
+ /**
+ * Sets the key for HMACs
+ *
+ * Keys can be of any length.
+ *
+ * @access public
+ * @param String $key
+ */
+ function setKey($key)
+ {
+ $this->key = $key;
+ }
+
+ /**
+ * Sets the hash function.
+ *
+ * @access public
+ * @param String $hash
+ */
+ function setHash($hash)
+ {
+ switch ($hash) {
+ case 'md5-96':
+ case 'sha1-96':
+ $this->l = 12; // 96 / 8 = 12
+ break;
+ case 'md2':
+ case 'md5':
+ $this->l = 16;
+ break;
+ case 'sha1':
+ $this->l = 20;
+ break;
+ case 'sha256':
+ $this->l = 32;
+ break;
+ case 'sha384':
+ $this->l = 48;
+ break;
+ case 'sha512':
+ $this->l = 64;
+ }
+
+ switch ($hash) {
+ case 'md2':
+ $mode = CRYPT_HASH_MODE_INTERNAL;
+ break;
+ case 'sha384':
+ case 'sha512':
+ $mode = CRYPT_HASH_MODE == CRYPT_HASH_MODE_MHASH ? CRYPT_HASH_MODE_INTERNAL : CRYPT_HASH_MODE;
+ break;
+ default:
+ $mode = CRYPT_HASH_MODE;
+ }
+
+ switch ( $mode ) {
+ case CRYPT_HASH_MODE_MHASH:
+ switch ($hash) {
+ case 'md5':
+ case 'md5-96':
+ $this->hash = MHASH_MD5;
+ break;
+ case 'sha256':
+ $this->hash = MHASH_SHA256;
+ break;
+ case 'sha1':
+ case 'sha1-96':
+ default:
+ $this->hash = MHASH_SHA1;
+ }
+ return;
+ case CRYPT_HASH_MODE_HASH:
+ switch ($hash) {
+ case 'md5':
+ case 'md5-96':
+ $this->hash = 'md5';
+ return;
+ case 'sha256':
+ case 'sha384':
+ case 'sha512':
+ $this->hash = $hash;
+ return;
+ case 'sha1':
+ case 'sha1-96':
+ default:
+ $this->hash = 'sha1';
+ }
+ return;
+ }
+
+ switch ($hash) {
+ case 'md2':
+ $this->b = 16;
+ $this->hash = array($this, '_md2');
+ break;
+ case 'md5':
+ case 'md5-96':
+ $this->b = 64;
+ $this->hash = array($this, '_md5');
+ break;
+ case 'sha256':
+ $this->b = 64;
+ $this->hash = array($this, '_sha256');
+ break;
+ case 'sha384':
+ case 'sha512':
+ $this->b = 128;
+ $this->hash = array($this, '_sha512');
+ break;
+ case 'sha1':
+ case 'sha1-96':
+ default:
+ $this->b = 64;
+ $this->hash = array($this, '_sha1');
+ }
+
+ $this->ipad = str_repeat(chr(0x36), $this->b);
+ $this->opad = str_repeat(chr(0x5C), $this->b);
+ }
+
+ /**
+ * Compute the HMAC.
+ *
+ * @access public
+ * @param String $text
+ * @return String
+ */
+ function hash($text)
+ {
+ $mode = is_array($this->hash) ? CRYPT_HASH_MODE_INTERNAL : CRYPT_HASH_MODE;
+
+ if (!empty($this->key)) {
+ switch ( $mode ) {
+ case CRYPT_HASH_MODE_MHASH:
+ $output = mhash($this->hash, $text, $this->key);
+ break;
+ case CRYPT_HASH_MODE_HASH:
+ $output = hash_hmac($this->hash, $text, $this->key, true);
+ break;
+ case CRYPT_HASH_MODE_INTERNAL:
+ /* "Applications that use keys longer than B bytes will first hash the key using H and then use the
+ resultant L byte string as the actual key to HMAC."
+
+ -- http://tools.ietf.org/html/rfc2104#section-2 */
+ $key = strlen($this->key) > $this->b ? call_user_func($this->$hash, $this->key) : $this->key;
+
+ $key = str_pad($key, $this->b, chr(0)); // step 1
+ $temp = $this->ipad ^ $key; // step 2
+ $temp .= $text; // step 3
+ $temp = call_user_func($this->hash, $temp); // step 4
+ $output = $this->opad ^ $key; // step 5
+ $output.= $temp; // step 6
+ $output = call_user_func($this->hash, $output); // step 7
+ }
+ } else {
+ switch ( $mode ) {
+ case CRYPT_HASH_MODE_MHASH:
+ $output = mhash($this->hash, $text);
+ break;
+ case CRYPT_HASH_MODE_HASH:
+ $output = hash($this->hash, $text, true);
+ break;
+ case CRYPT_HASH_MODE_INTERNAL:
+ $output = call_user_func($this->hash, $text);
+ }
+ }
+
+ return substr($output, 0, $this->l);
+ }
+
+ /**
+ * Returns the hash length (in bytes)
+ *
+ * @access private
+ * @return Integer
+ */
+ function getLength()
+ {
+ return $this->l;
+ }
+
+ /**
+ * Wrapper for MD5
+ *
+ * @access private
+ * @param String $text
+ */
+ function _md5($m)
+ {
+ return pack('H*', md5($m));
+ }
+
+ /**
+ * Wrapper for SHA1
+ *
+ * @access private
+ * @param String $text
+ */
+ function _sha1($m)
+ {
+ return pack('H*', sha1($m));
+ }
+
+ /**
+ * Pure-PHP implementation of MD2
+ *
+ * See {@link http://tools.ietf.org/html/rfc1319 RFC1319}.
+ *
+ * @access private
+ * @param String $text
+ */
+ function _md2($m)
+ {
+ static $s = array(
+ 41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6,
+ 19, 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188,
+ 76, 130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24,
+ 138, 23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251,
+ 245, 142, 187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63,
+ 148, 194, 16, 137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50,
+ 39, 53, 62, 204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165,
+ 181, 209, 215, 94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210,
+ 150, 164, 125, 182, 118, 252, 107, 226, 156, 116, 4, 241, 69, 157,
+ 112, 89, 100, 113, 135, 32, 134, 91, 207, 101, 230, 45, 168, 2, 27,
+ 96, 37, 173, 174, 176, 185, 246, 28, 70, 97, 105, 52, 64, 126, 15,
+ 85, 71, 163, 35, 221, 81, 175, 58, 195, 92, 249, 206, 186, 197,
+ 234, 38, 44, 83, 13, 110, 133, 40, 132, 9, 211, 223, 205, 244, 65,
+ 129, 77, 82, 106, 220, 55, 200, 108, 193, 171, 250, 36, 225, 123,
+ 8, 12, 189, 177, 74, 120, 136, 149, 139, 227, 99, 232, 109, 233,
+ 203, 213, 254, 59, 0, 29, 57, 242, 239, 183, 14, 102, 88, 208, 228,
+ 166, 119, 114, 248, 235, 117, 75, 10, 49, 68, 80, 180, 143, 237,
+ 31, 26, 219, 153, 141, 51, 159, 17, 131, 20
+ );
+
+ // Step 1. Append Padding Bytes
+ $pad = 16 - (strlen($m) & 0xF);
+ $m.= str_repeat(chr($pad), $pad);
+
+ $length = strlen($m);
+
+ // Step 2. Append Checksum
+ $c = str_repeat(chr(0), 16);
+ $l = chr(0);
+ for ($i = 0; $i < $length; $i+= 16) {
+ for ($j = 0; $j < 16; $j++) {
+ $c[$j] = chr($s[ord($m[$i + $j] ^ $l)]);
+ $l = $c[$j];
+ }
+ }
+ $m.= $c;
+
+ $length+= 16;
+
+ // Step 3. Initialize MD Buffer
+ $x = str_repeat(chr(0), 48);
+
+ // Step 4. Process Message in 16-Byte Blocks
+ for ($i = 0; $i < $length; $i+= 16) {
+ for ($j = 0; $j < 16; $j++) {
+ $x[$j + 16] = $m[$i + $j];
+ $x[$j + 32] = $x[$j + 16] ^ $x[$j];
+ }
+ $t = chr(0);
+ for ($j = 0; $j < 18; $j++) {
+ for ($k = 0; $k < 48; $k++) {
+ $x[$k] = $t = $x[$k] ^ chr($s[ord($t)]);
+ //$t = $x[$k] = $x[$k] ^ chr($s[ord($t)]);
+ }
+ $t = chr(ord($t) + $j);
+ }
+ }
+
+ // Step 5. Output
+ return substr($x, 0, 16);
+ }
+
+ /**
+ * Pure-PHP implementation of SHA256
+ *
+ * See {@link http://en.wikipedia.org/wiki/SHA_hash_functions#SHA-256_.28a_SHA-2_variant.29_pseudocode SHA-256 (a SHA-2 variant) pseudocode - Wikipedia}.
+ *
+ * @access private
+ * @param String $text
+ */
+ function _sha256($m)
+ {
+ if (extension_loaded('suhosin')) {
+ return pack('H*', sha256($m));
+ }
+
+ // Initialize variables
+ $hash = array(
+ 0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19
+ );
+ // Initialize table of round constants
+ // (first 32 bits of the fractional parts of the cube roots of the first 64 primes 2..311)
+ static $k = array(
+ 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
+ 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
+ 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
+ 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
+ 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
+ 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
+ 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
+ 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
+ );
+
+ // Pre-processing
+ $length = strlen($m);
+ // to round to nearest 56 mod 64, we'll add 64 - (length + (64 - 56)) % 64
+ $m.= str_repeat(chr(0), 64 - (($length + 8) & 0x3F));
+ $m[$length] = chr(0x80);
+ // we don't support hashing strings 512MB long
+ $m.= pack('N2', 0, $length << 3);
+
+ // Process the message in successive 512-bit chunks
+ $chunks = str_split($m, 64);
+ foreach ($chunks as $chunk) {
+ $w = array();
+ for ($i = 0; $i < 16; $i++) {
+ extract(unpack('Ntemp', $this->_string_shift($chunk, 4)));
+ $w[] = $temp;
+ }
+
+ // Extend the sixteen 32-bit words into sixty-four 32-bit words
+ for ($i = 16; $i < 64; $i++) {
+ $s0 = $this->_rightRotate($w[$i - 15], 7) ^
+ $this->_rightRotate($w[$i - 15], 18) ^
+ $this->_rightShift( $w[$i - 15], 3);
+ $s1 = $this->_rightRotate($w[$i - 2], 17) ^
+ $this->_rightRotate($w[$i - 2], 19) ^
+ $this->_rightShift( $w[$i - 2], 10);
+ $w[$i] = $this->_add($w[$i - 16], $s0, $w[$i - 7], $s1);
+
+ }
+
+ // Initialize hash value for this chunk
+ list($a, $b, $c, $d, $e, $f, $g, $h) = $hash;
+
+ // Main loop
+ for ($i = 0; $i < 64; $i++) {
+ $s0 = $this->_rightRotate($a, 2) ^
+ $this->_rightRotate($a, 13) ^
+ $this->_rightRotate($a, 22);
+ $maj = ($a & $b) ^
+ ($a & $c) ^
+ ($b & $c);
+ $t2 = $this->_add($s0, $maj);
+
+ $s1 = $this->_rightRotate($e, 6) ^
+ $this->_rightRotate($e, 11) ^
+ $this->_rightRotate($e, 25);
+ $ch = ($e & $f) ^
+ ($this->_not($e) & $g);
+ $t1 = $this->_add($h, $s1, $ch, $k[$i], $w[$i]);
+
+ $h = $g;
+ $g = $f;
+ $f = $e;
+ $e = $this->_add($d, $t1);
+ $d = $c;
+ $c = $b;
+ $b = $a;
+ $a = $this->_add($t1, $t2);
+ }
+
+ // Add this chunk's hash to result so far
+ $hash = array(
+ $this->_add($hash[0], $a),
+ $this->_add($hash[1], $b),
+ $this->_add($hash[2], $c),
+ $this->_add($hash[3], $d),
+ $this->_add($hash[4], $e),
+ $this->_add($hash[5], $f),
+ $this->_add($hash[6], $g),
+ $this->_add($hash[7], $h)
+ );
+ }
+
+ // Produce the final hash value (big-endian)
+ return pack('N8', $hash[0], $hash[1], $hash[2], $hash[3], $hash[4], $hash[5], $hash[6], $hash[7]);
+ }
+
+ /**
+ * Pure-PHP implementation of SHA384 and SHA512
+ *
+ * @access private
+ * @param String $text
+ */
+ function _sha512($m)
+ {
+ if (!class_exists('Math_BigInteger')) {
+ require_once('Math/BigInteger.php');
+ }
+
+ static $init384, $init512, $k;
+
+ if (!isset($k)) {
+ // Initialize variables
+ $init384 = array( // initial values for SHA384
+ 'cbbb9d5dc1059ed8', '629a292a367cd507', '9159015a3070dd17', '152fecd8f70e5939',
+ '67332667ffc00b31', '8eb44a8768581511', 'db0c2e0d64f98fa7', '47b5481dbefa4fa4'
+ );
+ $init512 = array( // initial values for SHA512
+ '6a09e667f3bcc908', 'bb67ae8584caa73b', '3c6ef372fe94f82b', 'a54ff53a5f1d36f1',
+ '510e527fade682d1', '9b05688c2b3e6c1f', '1f83d9abfb41bd6b', '5be0cd19137e2179'
+ );
+
+ for ($i = 0; $i < 8; $i++) {
+ $init384[$i] = new Math_BigInteger($init384[$i], 16);
+ $init384[$i]->setPrecision(64);
+ $init512[$i] = new Math_BigInteger($init512[$i], 16);
+ $init512[$i]->setPrecision(64);
+ }
+
+ // Initialize table of round constants
+ // (first 64 bits of the fractional parts of the cube roots of the first 80 primes 2..409)
+ $k = array(
+ '428a2f98d728ae22', '7137449123ef65cd', 'b5c0fbcfec4d3b2f', 'e9b5dba58189dbbc',
+ '3956c25bf348b538', '59f111f1b605d019', '923f82a4af194f9b', 'ab1c5ed5da6d8118',
+ 'd807aa98a3030242', '12835b0145706fbe', '243185be4ee4b28c', '550c7dc3d5ffb4e2',
+ '72be5d74f27b896f', '80deb1fe3b1696b1', '9bdc06a725c71235', 'c19bf174cf692694',
+ 'e49b69c19ef14ad2', 'efbe4786384f25e3', '0fc19dc68b8cd5b5', '240ca1cc77ac9c65',
+ '2de92c6f592b0275', '4a7484aa6ea6e483', '5cb0a9dcbd41fbd4', '76f988da831153b5',
+ '983e5152ee66dfab', 'a831c66d2db43210', 'b00327c898fb213f', 'bf597fc7beef0ee4',
+ 'c6e00bf33da88fc2', 'd5a79147930aa725', '06ca6351e003826f', '142929670a0e6e70',
+ '27b70a8546d22ffc', '2e1b21385c26c926', '4d2c6dfc5ac42aed', '53380d139d95b3df',
+ '650a73548baf63de', '766a0abb3c77b2a8', '81c2c92e47edaee6', '92722c851482353b',
+ 'a2bfe8a14cf10364', 'a81a664bbc423001', 'c24b8b70d0f89791', 'c76c51a30654be30',
+ 'd192e819d6ef5218', 'd69906245565a910', 'f40e35855771202a', '106aa07032bbd1b8',
+ '19a4c116b8d2d0c8', '1e376c085141ab53', '2748774cdf8eeb99', '34b0bcb5e19b48a8',
+ '391c0cb3c5c95a63', '4ed8aa4ae3418acb', '5b9cca4f7763e373', '682e6ff3d6b2b8a3',
+ '748f82ee5defb2fc', '78a5636f43172f60', '84c87814a1f0ab72', '8cc702081a6439ec',
+ '90befffa23631e28', 'a4506cebde82bde9', 'bef9a3f7b2c67915', 'c67178f2e372532b',
+ 'ca273eceea26619c', 'd186b8c721c0c207', 'eada7dd6cde0eb1e', 'f57d4f7fee6ed178',
+ '06f067aa72176fba', '0a637dc5a2c898a6', '113f9804bef90dae', '1b710b35131c471b',
+ '28db77f523047d84', '32caab7b40c72493', '3c9ebe0a15c9bebc', '431d67c49c100d4c',
+ '4cc5d4becb3e42b6', '597f299cfc657e2a', '5fcb6fab3ad6faec', '6c44198c4a475817'
+ );
+
+ for ($i = 0; $i < 80; $i++) {
+ $k[$i] = new Math_BigInteger($k[$i], 16);
+ }
+ }
+
+ $hash = $this->l == 48 ? $init384 : $init512;
+
+ // Pre-processing
+ $length = strlen($m);
+ // to round to nearest 112 mod 128, we'll add 128 - (length + (128 - 112)) % 128
+ $m.= str_repeat(chr(0), 128 - (($length + 16) & 0x7F));
+ $m[$length] = chr(0x80);
+ // we don't support hashing strings 512MB long
+ $m.= pack('N4', 0, 0, 0, $length << 3);
+
+ // Process the message in successive 1024-bit chunks
+ $chunks = str_split($m, 128);
+ foreach ($chunks as $chunk) {
+ $w = array();
+ for ($i = 0; $i < 16; $i++) {
+ $temp = new Math_BigInteger($this->_string_shift($chunk, 8), 256);
+ $temp->setPrecision(64);
+ $w[] = $temp;
+ }
+
+ // Extend the sixteen 32-bit words into eighty 32-bit words
+ for ($i = 16; $i < 80; $i++) {
+ $temp = array(
+ $w[$i - 15]->bitwise_rightRotate(1),
+ $w[$i - 15]->bitwise_rightRotate(8),
+ $w[$i - 15]->bitwise_rightShift(7)
+ );
+ $s0 = $temp[0]->bitwise_xor($temp[1]);
+ $s0 = $s0->bitwise_xor($temp[2]);
+ $temp = array(
+ $w[$i - 2]->bitwise_rightRotate(19),
+ $w[$i - 2]->bitwise_rightRotate(61),
+ $w[$i - 2]->bitwise_rightShift(6)
+ );
+ $s1 = $temp[0]->bitwise_xor($temp[1]);
+ $s1 = $s1->bitwise_xor($temp[2]);
+ $w[$i] = $w[$i - 16]->copy();
+ $w[$i] = $w[$i]->add($s0);
+ $w[$i] = $w[$i]->add($w[$i - 7]);
+ $w[$i] = $w[$i]->add($s1);
+ }
+
+ // Initialize hash value for this chunk
+ $a = $hash[0]->copy();
+ $b = $hash[1]->copy();
+ $c = $hash[2]->copy();
+ $d = $hash[3]->copy();
+ $e = $hash[4]->copy();
+ $f = $hash[5]->copy();
+ $g = $hash[6]->copy();
+ $h = $hash[7]->copy();
+
+ // Main loop
+ for ($i = 0; $i < 80; $i++) {
+ $temp = array(
+ $a->bitwise_rightRotate(28),
+ $a->bitwise_rightRotate(34),
+ $a->bitwise_rightRotate(39)
+ );
+ $s0 = $temp[0]->bitwise_xor($temp[1]);
+ $s0 = $s0->bitwise_xor($temp[2]);
+ $temp = array(
+ $a->bitwise_and($b),
+ $a->bitwise_and($c),
+ $b->bitwise_and($c)
+ );
+ $maj = $temp[0]->bitwise_xor($temp[1]);
+ $maj = $maj->bitwise_xor($temp[2]);
+ $t2 = $s0->add($maj);
+
+ $temp = array(
+ $e->bitwise_rightRotate(14),
+ $e->bitwise_rightRotate(18),
+ $e->bitwise_rightRotate(41)
+ );
+ $s1 = $temp[0]->bitwise_xor($temp[1]);
+ $s1 = $s1->bitwise_xor($temp[2]);
+ $temp = array(
+ $e->bitwise_and($f),
+ $g->bitwise_and($e->bitwise_not())
+ );
+ $ch = $temp[0]->bitwise_xor($temp[1]);
+ $t1 = $h->add($s1);
+ $t1 = $t1->add($ch);
+ $t1 = $t1->add($k[$i]);
+ $t1 = $t1->add($w[$i]);
+
+ $h = $g->copy();
+ $g = $f->copy();
+ $f = $e->copy();
+ $e = $d->add($t1);
+ $d = $c->copy();
+ $c = $b->copy();
+ $b = $a->copy();
+ $a = $t1->add($t2);
+ }
+
+ // Add this chunk's hash to result so far
+ $hash = array(
+ $hash[0]->add($a),
+ $hash[1]->add($b),
+ $hash[2]->add($c),
+ $hash[3]->add($d),
+ $hash[4]->add($e),
+ $hash[5]->add($f),
+ $hash[6]->add($g),
+ $hash[7]->add($h)
+ );
+ }
+
+ // Produce the final hash value (big-endian)
+ // (Crypt_Hash::hash() trims the output for hashes but not for HMACs. as such, we trim the output here)
+ $temp = $hash[0]->toBytes() . $hash[1]->toBytes() . $hash[2]->toBytes() . $hash[3]->toBytes() .
+ $hash[4]->toBytes() . $hash[5]->toBytes();
+ if ($this->l != 48) {
+ $temp.= $hash[6]->toBytes() . $hash[7]->toBytes();
+ }
+
+ return $temp;
+ }
+
+ /**
+ * Right Rotate
+ *
+ * @access private
+ * @param Integer $int
+ * @param Integer $amt
+ * @see _sha256()
+ * @return Integer
+ */
+ function _rightRotate($int, $amt)
+ {
+ $invamt = 32 - $amt;
+ $mask = (1 << $invamt) - 1;
+ return (($int << $invamt) & 0xFFFFFFFF) | (($int >> $amt) & $mask);
+ }
+
+ /**
+ * Right Shift
+ *
+ * @access private
+ * @param Integer $int
+ * @param Integer $amt
+ * @see _sha256()
+ * @return Integer
+ */
+ function _rightShift($int, $amt)
+ {
+ $mask = (1 << (32 - $amt)) - 1;
+ return ($int >> $amt) & $mask;
+ }
+
+ /**
+ * Not
+ *
+ * @access private
+ * @param Integer $int
+ * @see _sha256()
+ * @return Integer
+ */
+ function _not($int)
+ {
+ return ~$int & 0xFFFFFFFF;
+ }
+
+ /**
+ * Add
+ *
+ * _sha256() adds multiple unsigned 32-bit integers. Since PHP doesn't support unsigned integers and since the
+ * possibility of overflow exists, care has to be taken. Math_BigInteger() could be used but this should be faster.
+ *
+ * @param String $string
+ * @param optional Integer $index
+ * @return String
+ * @see _sha256()
+ * @access private
+ */
+ function _add()
+ {
+ static $mod;
+ if (!isset($mod)) {
+ $mod = pow(2, 32);
+ }
+
+ $result = 0;
+ $arguments = func_get_args();
+ foreach ($arguments as $argument) {
+ $result+= $argument < 0 ? ($argument & 0x7FFFFFFF) + 0x80000000 : $argument;
+ }
+
+ return fmod($result, $mod);
+ }
+
+ /**
+ * String Shift
+ *
+ * Inspired by array_shift
+ *
+ * @param String $string
+ * @param optional Integer $index
+ * @return String
+ * @access private
+ */
+ function _string_shift(&$string, $index = 1)
+ {
+ $substr = substr($string, 0, $index);
+ $string = substr($string, $index);
+ return $substr;
+ }
+}
\ No newline at end of file diff --git a/phpsec/Crypt/RC4.php b/phpsec/Crypt/RC4.php new file mode 100644 index 000000000..6f82b2413 --- /dev/null +++ b/phpsec/Crypt/RC4.php @@ -0,0 +1,493 @@ +<?php
+/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
+
+/**
+ * Pure-PHP implementation of RC4.
+ *
+ * Uses mcrypt, if available, and an internal implementation, otherwise.
+ *
+ * PHP versions 4 and 5
+ *
+ * Useful resources are as follows:
+ *
+ * - {@link http://www.mozilla.org/projects/security/pki/nss/draft-kaukonen-cipher-arcfour-03.txt ARCFOUR Algorithm}
+ * - {@link http://en.wikipedia.org/wiki/RC4 - Wikipedia: RC4}
+ *
+ * RC4 is also known as ARCFOUR or ARC4. The reason is elaborated upon at Wikipedia. This class is named RC4 and not
+ * ARCFOUR or ARC4 because RC4 is how it is refered to in the SSH1 specification.
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ * include('Crypt/RC4.php');
+ *
+ * $rc4 = new Crypt_RC4();
+ *
+ * $rc4->setKey('abcdefgh');
+ *
+ * $size = 10 * 1024;
+ * $plaintext = '';
+ * for ($i = 0; $i < $size; $i++) {
+ * $plaintext.= 'a';
+ * }
+ *
+ * echo $rc4->decrypt($rc4->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_RC4
+ * @author Jim Wigginton <terrafrost@php.net>
+ * @copyright MMVII Jim Wigginton
+ * @license http://www.gnu.org/licenses/lgpl.txt
+ * @version $Id: RC4.php,v 1.8 2009/06/09 04:00:38 terrafrost Exp $
+ * @link http://phpseclib.sourceforge.net
+ */
+
+/**#@+
+ * @access private
+ * @see Crypt_RC4::Crypt_RC4()
+ */
+/**
+ * Toggles the internal implementation
+ */
+define('CRYPT_RC4_MODE_INTERNAL', 1);
+/**
+ * Toggles the mcrypt implementation
+ */
+define('CRYPT_RC4_MODE_MCRYPT', 2);
+/**#@-*/
+
+/**#@+
+ * @access private
+ * @see Crypt_RC4::_crypt()
+ */
+define('CRYPT_RC4_ENCRYPT', 0);
+define('CRYPT_RC4_DECRYPT', 1);
+/**#@-*/
+
+/**
+ * Pure-PHP implementation of RC4.
+ *
+ * @author Jim Wigginton <terrafrost@php.net>
+ * @version 0.1.0
+ * @access public
+ * @package Crypt_RC4
+ */
+class Crypt_RC4 {
+ /**
+ * The Key
+ *
+ * @see Crypt_RC4::setKey()
+ * @var String
+ * @access private
+ */
+ var $key = "\0";
+
+ /**
+ * The Key Stream for encryption
+ *
+ * If CRYPT_RC4_MODE == CRYPT_RC4_MODE_MCRYPT, this will be equal to the mcrypt object
+ *
+ * @see Crypt_RC4::setKey()
+ * @var Array
+ * @access private
+ */
+ var $encryptStream = false;
+
+ /**
+ * The Key Stream for decryption
+ *
+ * If CRYPT_RC4_MODE == CRYPT_RC4_MODE_MCRYPT, this will be equal to the mcrypt object
+ *
+ * @see Crypt_RC4::setKey()
+ * @var Array
+ * @access private
+ */
+ var $decryptStream = false;
+
+ /**
+ * The $i and $j indexes for encryption
+ *
+ * @see Crypt_RC4::_crypt()
+ * @var Integer
+ * @access private
+ */
+ var $encryptIndex = 0;
+
+ /**
+ * The $i and $j indexes for decryption
+ *
+ * @see Crypt_RC4::_crypt()
+ * @var Integer
+ * @access private
+ */
+ var $decryptIndex = 0;
+
+ /**
+ * MCrypt parameters
+ *
+ * @see Crypt_RC4::setMCrypt()
+ * @var Array
+ * @access private
+ */
+ var $mcrypt = array('', '');
+
+ /**
+ * The Encryption Algorithm
+ *
+ * Only used if CRYPT_RC4_MODE == CRYPT_RC4_MODE_MCRYPT. Only possible values are MCRYPT_RC4 or MCRYPT_ARCFOUR.
+ *
+ * @see Crypt_RC4::Crypt_RC4()
+ * @var Integer
+ * @access private
+ */
+ var $mode;
+
+ /**
+ * Default Constructor.
+ *
+ * Determines whether or not the mcrypt extension should be used.
+ *
+ * @param optional Integer $mode
+ * @return Crypt_RC4
+ * @access public
+ */
+ function Crypt_RC4()
+ {
+ if ( !defined('CRYPT_RC4_MODE') ) {
+ switch (true) {
+ case extension_loaded('mcrypt') && (defined('MCRYPT_ARCFOUR') || defined('MCRYPT_RC4')):
+ // i'd check to see if rc4 was supported, by doing in_array('arcfour', 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_RC4_MODE', CRYPT_RC4_MODE_MCRYPT);
+ break;
+ default:
+ define('CRYPT_RC4_MODE', CRYPT_RC4_MODE_INTERNAL);
+ }
+ }
+
+ switch ( CRYPT_RC4_MODE ) {
+ case CRYPT_RC4_MODE_MCRYPT:
+ switch (true) {
+ case defined('MCRYPT_ARCFOUR'):
+ $this->mode = MCRYPT_ARCFOUR;
+ break;
+ case defined('MCRYPT_RC4');
+ $this->mode = MCRYPT_RC4;
+ }
+ }
+ }
+
+ /**
+ * Sets the key.
+ *
+ * Keys can be between 1 and 256 bytes long. If they are longer then 256 bytes, the first 256 bytes will
+ * be used. If no key is explicitly set, it'll be assumed to be a single null byte.
+ *
+ * @access public
+ * @param String $key
+ */
+ function setKey($key)
+ {
+ $this->key = $key;
+
+ if ( CRYPT_RC4_MODE == CRYPT_RC4_MODE_MCRYPT ) {
+ return;
+ }
+
+ $keyLength = strlen($key);
+ $keyStream = array();
+ for ($i = 0; $i < 256; $i++) {
+ $keyStream[$i] = $i;
+ }
+ $j = 0;
+ for ($i = 0; $i < 256; $i++) {
+ $j = ($j + $keyStream[$i] + ord($key[$i % $keyLength])) & 255;
+ $temp = $keyStream[$i];
+ $keyStream[$i] = $keyStream[$j];
+ $keyStream[$j] = $temp;
+ }
+
+ $this->encryptIndex = $this->decryptIndex = array(0, 0);
+ $this->encryptStream = $this->decryptStream = $keyStream;
+ }
+
+ /**
+ * Dummy function.
+ *
+ * Some protocols, such as WEP, prepend an "initialization vector" to the key, effectively creating a new key [1].
+ * If you need to use an initialization vector in this manner, feel free to prepend it to the key, yourself, before
+ * calling setKey().
+ *
+ * [1] WEP's initialization vectors (IV's) are used in a somewhat insecure way. Since, in that protocol,
+ * the IV's are relatively easy to predict, an attack described by
+ * {@link http://www.drizzle.com/~aboba/IEEE/rc4_ksaproc.pdf Scott Fluhrer, Itsik Mantin, and Adi Shamir}
+ * can be used to quickly guess at the rest of the key. The following links elaborate:
+ *
+ * {@link http://www.rsa.com/rsalabs/node.asp?id=2009 http://www.rsa.com/rsalabs/node.asp?id=2009}
+ * {@link http://en.wikipedia.org/wiki/Related_key_attack http://en.wikipedia.org/wiki/Related_key_attack}
+ *
+ * @param String $iv
+ * @see Crypt_RC4::setKey()
+ * @access public
+ */
+ function setIV($iv)
+ {
+ }
+
+ /**
+ * Sets MCrypt parameters. (optional)
+ *
+ * If MCrypt is being used, empty strings will be used, unless otherwise specified.
+ *
+ * @link http://php.net/function.mcrypt-module-open#function.mcrypt-module-open
+ * @access public
+ * @param optional Integer $algorithm_directory
+ * @param optional Integer $mode_directory
+ */
+ function setMCrypt($algorithm_directory = '', $mode_directory = '')
+ {
+ if ( CRYPT_RC4_MODE == CRYPT_RC4_MODE_MCRYPT ) {
+ $this->mcrypt = array($algorithm_directory, $mode_directory);
+ $this->_closeMCrypt();
+ }
+ }
+
+ /**
+ * Encrypts a message.
+ *
+ * @see Crypt_RC4::_crypt()
+ * @access public
+ * @param String $plaintext
+ */
+ function encrypt($plaintext)
+ {
+ return $this->_crypt($plaintext, CRYPT_RC4_ENCRYPT);
+ }
+
+ /**
+ * Decrypts a message.
+ *
+ * $this->decrypt($this->encrypt($plaintext)) == $this->encrypt($this->encrypt($plaintext)).
+ * Atleast if the continuous buffer is disabled.
+ *
+ * @see Crypt_RC4::_crypt()
+ * @access public
+ * @param String $ciphertext
+ */
+ function decrypt($ciphertext)
+ {
+ return $this->_crypt($ciphertext, CRYPT_RC4_DECRYPT);
+ }
+
+ /**
+ * Encrypts or decrypts a message.
+ *
+ * @see Crypt_RC4::encrypt()
+ * @see Crypt_RC4::decrypt()
+ * @access private
+ * @param String $text
+ * @param Integer $mode
+ */
+ function _crypt($text, $mode)
+ {
+ if ( CRYPT_RC4_MODE == CRYPT_RC4_MODE_MCRYPT ) {
+ $keyStream = $mode == CRYPT_RC4_ENCRYPT ? 'encryptStream' : 'decryptStream';
+
+ if ($this->$keyStream === false) {
+ $this->$keyStream = mcrypt_module_open($this->mode, $this->mcrypt[0], MCRYPT_MODE_STREAM, $this->mcrypt[1]);
+ mcrypt_generic_init($this->$keyStream, $this->key, '');
+ } else if (!$this->continuousBuffer) {
+ mcrypt_generic_init($this->$keyStream, $this->key, '');
+ }
+ $newText = mcrypt_generic($this->$keyStream, $text);
+ if (!$this->continuousBuffer) {
+ mcrypt_generic_deinit($this->$keyStream);
+ }
+
+ return $newText;
+ }
+
+ if ($this->encryptStream === false) {
+ $this->setKey($this->key);
+ }
+
+ switch ($mode) {
+ case CRYPT_RC4_ENCRYPT:
+ $keyStream = $this->encryptStream;
+ list($i, $j) = $this->encryptIndex;
+ break;
+ case CRYPT_RC4_DECRYPT:
+ $keyStream = $this->decryptStream;
+ list($i, $j) = $this->decryptIndex;
+ }
+
+ $newText = '';
+ for ($k = 0; $k < strlen($text); $k++) {
+ $i = ($i + 1) & 255;
+ $j = ($j + $keyStream[$i]) & 255;
+ $temp = $keyStream[$i];
+ $keyStream[$i] = $keyStream[$j];
+ $keyStream[$j] = $temp;
+ $temp = $keyStream[($keyStream[$i] + $keyStream[$j]) & 255];
+ $newText.= chr(ord($text[$k]) ^ $temp);
+ }
+
+ if ($this->continuousBuffer) {
+ switch ($mode) {
+ case CRYPT_RC4_ENCRYPT:
+ $this->encryptStream = $keyStream;
+ $this->encryptIndex = array($i, $j);
+ break;
+ case CRYPT_RC4_DECRYPT:
+ $this->decryptStream = $keyStream;
+ $this->decryptIndex = array($i, $j);
+ }
+ }
+
+ return $newText;
+ }
+
+ /**
+ * 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 $rc4->encrypt(substr($plaintext, 0, 8));
+ * echo $rc4->encrypt(substr($plaintext, 8, 8));
+ * </code>
+ * <code>
+ * echo $rc4->encrypt($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>
+ * $rc4->encrypt(substr($plaintext, 0, 8));
+ * echo $rc4->decrypt($des->encrypt(substr($plaintext, 8, 8)));
+ * </code>
+ * <code>
+ * echo $rc4->decrypt($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_RC4::disableContinuousBuffer()
+ * @access public
+ */
+ function enableContinuousBuffer()
+ {
+ $this->continuousBuffer = true;
+ }
+
+ /**
+ * Treat consecutive packets as if they are a discontinuous buffer.
+ *
+ * The default behavior.
+ *
+ * @see Crypt_RC4::enableContinuousBuffer()
+ * @access public
+ */
+ function disableContinuousBuffer()
+ {
+ if ( CRYPT_RC4_MODE == CRYPT_RC4_MODE_INTERNAL ) {
+ $this->encryptIndex = $this->decryptIndex = array(0, 0);
+ $this->setKey($this->key);
+ }
+
+ $this->continuousBuffer = false;
+ }
+
+ /**
+ * Dummy function.
+ *
+ * Since RC4 is a stream cipher and not a block cipher, no padding is necessary. The only reason this function is
+ * included is so that you can switch between a block cipher and a stream cipher transparently.
+ *
+ * @see Crypt_RC4::disablePadding()
+ * @access public
+ */
+ function enablePadding()
+ {
+ }
+
+ /**
+ * Dummy function.
+ *
+ * @see Crypt_RC4::enablePadding()
+ * @access public
+ */
+ function disablePadding()
+ {
+ }
+
+ /**
+ * Class destructor.
+ *
+ * Will be called, automatically, if you're using PHP5. If you're using PHP4, call it yourself. Only really
+ * needs to be called if mcrypt is being used.
+ *
+ * @access public
+ */
+ function __destruct()
+ {
+ if ( CRYPT_RC4_MODE == CRYPT_RC4_MODE_MCRYPT ) {
+ $this->_closeMCrypt();
+ }
+ }
+
+ /**
+ * Properly close the MCrypt objects.
+ *
+ * @access prviate
+ */
+ function _closeMCrypt()
+ {
+ if ( $this->encryptStream !== false ) {
+ if ( $this->continuousBuffer ) {
+ mcrypt_generic_deinit($this->encryptStream);
+ }
+
+ mcrypt_module_close($this->encryptStream);
+
+ $this->encryptStream = false;
+ }
+
+ if ( $this->decryptStream !== false ) {
+ if ( $this->continuousBuffer ) {
+ mcrypt_generic_deinit($this->decryptStream);
+ }
+
+ mcrypt_module_close($this->decryptStream);
+
+ $this->decryptStream = false;
+ }
+ }
+}
\ No newline at end of file diff --git a/phpsec/Crypt/RSA.php b/phpsec/Crypt/RSA.php new file mode 100644 index 000000000..1c562082b --- /dev/null +++ b/phpsec/Crypt/RSA.php @@ -0,0 +1,2119 @@ +<?php
+/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
+
+/**
+ * Pure-PHP PKCS#1 (v2.1) compliant implementation of RSA.
+ *
+ * PHP versions 4 and 5
+ *
+ * Here's an example of how to encrypt and decrypt text with this library:
+ * <code>
+ * <?php
+ * include('Crypt/RSA.php');
+ *
+ * $rsa = new Crypt_RSA();
+ * extract($rsa->createKey());
+ *
+ * $plaintext = 'terrafrost';
+ *
+ * $rsa->loadKey($privatekey);
+ * $ciphertext = $rsa->encrypt($plaintext);
+ *
+ * $rsa->loadKey($publickey);
+ * echo $rsa->decrypt($ciphertext);
+ * ?>
+ * </code>
+ *
+ * Here's an example of how to create signatures and verify signatures with this library:
+ * <code>
+ * <?php
+ * include('Crypt/RSA.php');
+ *
+ * $rsa = new Crypt_RSA();
+ * extract($rsa->createKey());
+ *
+ * $plaintext = 'terrafrost';
+ *
+ * $rsa->loadKey($privatekey);
+ * $signature = $rsa->sign($plaintext);
+ *
+ * $rsa->loadKey($publickey);
+ * echo $rsa->verify($plaintext, $signature) ? 'verified' : 'unverified';
+ * ?>
+ * </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_RSA
+ * @author Jim Wigginton <terrafrost@php.net>
+ * @copyright MMIX Jim Wigginton
+ * @license http://www.gnu.org/licenses/lgpl.txt
+ * @version $Id: RSA.php,v 1.15 2010/04/10 15:57:02 terrafrost Exp $
+ * @link http://phpseclib.sourceforge.net
+ */
+
+/**
+ * Include Math_BigInteger
+ */
+require_once('Math/BigInteger.php');
+
+/**
+ * Include Crypt_Random
+ */
+require_once('Crypt/Random.php');
+
+/**
+ * Include Crypt_Hash
+ */
+require_once('Crypt/Hash.php');
+
+/**#@+
+ * @access public
+ * @see Crypt_RSA::encrypt()
+ * @see Crypt_RSA::decrypt()
+ */
+/**
+ * Use {@link http://en.wikipedia.org/wiki/Optimal_Asymmetric_Encryption_Padding Optimal Asymmetric Encryption Padding}
+ * (OAEP) for encryption / decryption.
+ *
+ * Uses sha1 by default.
+ *
+ * @see Crypt_RSA::setHash()
+ * @see Crypt_RSA::setMGFHash()
+ */
+define('CRYPT_RSA_ENCRYPTION_OAEP', 1);
+/**
+ * Use PKCS#1 padding.
+ *
+ * Although CRYPT_RSA_ENCRYPTION_OAEP offers more security, including PKCS#1 padding is necessary for purposes of backwards
+ * compatability with protocols (like SSH-1) written before OAEP's introduction.
+ */
+define('CRYPT_RSA_ENCRYPTION_PKCS1', 2);
+/**#@-*/
+
+/**#@+
+ * @access public
+ * @see Crypt_RSA::sign()
+ * @see Crypt_RSA::verify()
+ * @see Crypt_RSA::setHash()
+ */
+/**
+ * Use the Probabilistic Signature Scheme for signing
+ *
+ * Uses sha1 by default.
+ *
+ * @see Crypt_RSA::setSaltLength()
+ * @see Crypt_RSA::setMGFHash()
+ */
+define('CRYPT_RSA_SIGNATURE_PSS', 1);
+/**
+ * Use the PKCS#1 scheme by default.
+ *
+ * Although CRYPT_RSA_SIGNATURE_PSS offers more security, including PKCS#1 signing is necessary for purposes of backwards
+ * compatability with protocols (like SSH-2) written before PSS's introduction.
+ */
+define('CRYPT_RSA_SIGNATURE_PKCS1', 2);
+/**#@-*/
+
+/**#@+
+ * @access private
+ * @see Crypt_RSA::createKey()
+ */
+/**
+ * ASN1 Integer
+ */
+define('CRYPT_RSA_ASN1_INTEGER', 2);
+/**
+ * ASN1 Sequence (with the constucted bit set)
+ */
+define('CRYPT_RSA_ASN1_SEQUENCE', 48);
+/**#@-*/
+
+/**#@+
+ * @access private
+ * @see Crypt_RSA::Crypt_RSA()
+ */
+/**
+ * To use the pure-PHP implementation
+ */
+define('CRYPT_RSA_MODE_INTERNAL', 1);
+/**
+ * To use the OpenSSL library
+ *
+ * (if enabled; otherwise, the internal implementation will be used)
+ */
+define('CRYPT_RSA_MODE_OPENSSL', 2);
+/**#@-*/
+
+/**#@+
+ * @access public
+ * @see Crypt_RSA::createKey()
+ * @see Crypt_RSA::setPrivateKeyFormat()
+ */
+/**
+ * PKCS#1 formatted private key
+ *
+ * Used by OpenSSH
+ */
+define('CRYPT_RSA_PRIVATE_FORMAT_PKCS1', 0);
+/**#@-*/
+
+/**#@+
+ * @access public
+ * @see Crypt_RSA::createKey()
+ * @see Crypt_RSA::setPublicKeyFormat()
+ */
+/**
+ * Raw public key
+ *
+ * An array containing two Math_BigInteger objects.
+ *
+ * The exponent can be indexed with any of the following:
+ *
+ * 0, e, exponent, publicExponent
+ *
+ * The modulus can be indexed with any of the following:
+ *
+ * 1, n, modulo, modulus
+ */
+define('CRYPT_RSA_PUBLIC_FORMAT_RAW', 1);
+/**
+ * PKCS#1 formatted public key
+ */
+define('CRYPT_RSA_PUBLIC_FORMAT_PKCS1', 2);
+/**
+ * OpenSSH formatted public key
+ *
+ * Place in $HOME/.ssh/authorized_keys
+ */
+define('CRYPT_RSA_PUBLIC_FORMAT_OPENSSH', 3);
+/**#@-*/
+
+/**
+ * Pure-PHP PKCS#1 compliant implementation of RSA.
+ *
+ * @author Jim Wigginton <terrafrost@php.net>
+ * @version 0.1.0
+ * @access public
+ * @package Crypt_RSA
+ */
+class Crypt_RSA {
+ /**
+ * Precomputed Zero
+ *
+ * @var Array
+ * @access private
+ */
+ var $zero;
+
+ /**
+ * Precomputed One
+ *
+ * @var Array
+ * @access private
+ */
+ var $one;
+
+ /**
+ * Private Key Format
+ *
+ * @var Integer
+ * @access private
+ */
+ var $privateKeyFormat = CRYPT_RSA_PRIVATE_FORMAT_PKCS1;
+
+ /**
+ * Public Key Format
+ *
+ * @var Integer
+ * @access public
+ */
+ var $publicKeyFormat = CRYPT_RSA_PUBLIC_FORMAT_PKCS1;
+
+ /**
+ * Modulus (ie. n)
+ *
+ * @var Math_BigInteger
+ * @access private
+ */
+ var $modulus;
+
+ /**
+ * Modulus length
+ *
+ * @var Math_BigInteger
+ * @access private
+ */
+ var $k;
+
+ /**
+ * Exponent (ie. e or d)
+ *
+ * @var Math_BigInteger
+ * @access private
+ */
+ var $exponent;
+
+ /**
+ * Primes for Chinese Remainder Theorem (ie. p and q)
+ *
+ * @var Array
+ * @access private
+ */
+ var $primes;
+
+ /**
+ * Exponents for Chinese Remainder Theorem (ie. dP and dQ)
+ *
+ * @var Array
+ * @access private
+ */
+ var $exponents;
+
+ /**
+ * Coefficients for Chinese Remainder Theorem (ie. qInv)
+ *
+ * @var Array
+ * @access private
+ */
+ var $coefficients;
+
+ /**
+ * Hash name
+ *
+ * @var String
+ * @access private
+ */
+ var $hashName;
+
+ /**
+ * Hash function
+ *
+ * @var Crypt_Hash
+ * @access private
+ */
+ var $hash;
+
+ /**
+ * Length of hash function output
+ *
+ * @var Integer
+ * @access private
+ */
+ var $hLen;
+
+ /**
+ * Length of salt
+ *
+ * @var Integer
+ * @access private
+ */
+ var $sLen;
+
+ /**
+ * Hash function for the Mask Generation Function
+ *
+ * @var Crypt_Hash
+ * @access private
+ */
+ var $mgfHash;
+
+ /**
+ * Length of MGF hash function output
+ *
+ * @var Integer
+ * @access private
+ */
+ var $mgfHLen;
+
+ /**
+ * Encryption mode
+ *
+ * @var Integer
+ * @access private
+ */
+ var $encryptionMode = CRYPT_RSA_ENCRYPTION_OAEP;
+
+ /**
+ * Signature mode
+ *
+ * @var Integer
+ * @access private
+ */
+ var $signatureMode = CRYPT_RSA_SIGNATURE_PSS;
+
+ /**
+ * Public Exponent
+ *
+ * @var Mixed
+ * @access private
+ */
+ var $publicExponent = false;
+
+ /**
+ * Password
+ *
+ * @var String
+ * @access private
+ */
+ var $password = '';
+
+ /**
+ * The constructor
+ *
+ * If you want to make use of the openssl extension, you'll need to set the mode manually, yourself. The reason
+ * Crypt_RSA doesn't do it is because OpenSSL doesn't fail gracefully. openssl_pkey_new(), in particular, requires
+ * openssl.cnf be present somewhere and, unfortunately, the only real way to find out is too late.
+ *
+ * @return Crypt_RSA
+ * @access public
+ */
+ function Crypt_RSA()
+ {
+ if ( !defined('CRYPT_RSA_MODE') ) {
+ switch (true) {
+ //case extension_loaded('openssl') && version_compare(PHP_VERSION, '4.2.0', '>='):
+ // define('CRYPT_RSA_MODE', CRYPT_RSA_MODE_OPENSSL);
+ // break;
+ default:
+ define('CRYPT_RSA_MODE', CRYPT_RSA_MODE_INTERNAL);
+ }
+ }
+
+ $this->zero = new Math_BigInteger();
+ $this->one = new Math_BigInteger(1);
+
+ $this->hash = new Crypt_Hash('sha1');
+ $this->hLen = $this->hash->getLength();
+ $this->hashName = 'sha1';
+ $this->mgfHash = new Crypt_Hash('sha1');
+ $this->mgfHLen = $this->mgfHash->getLength();
+ }
+
+ /**
+ * Create public / private key pair
+ *
+ * Returns an array with the following three elements:
+ * - 'privatekey': The private key.
+ * - 'publickey': The public key.
+ * - 'partialkey': A partially computed key (if the execution time exceeded $timeout).
+ * Will need to be passed back to Crypt_RSA::createKey() as the third parameter for further processing.
+ *
+ * @access public
+ * @param optional Integer $bits
+ * @param optional Integer $timeout
+ * @param optional Math_BigInteger $p
+ */
+ function createKey($bits = 1024, $timeout = false, $partial = array())
+ {
+ if ( CRYPT_RSA_MODE == CRYPT_RSA_MODE_OPENSSL ) {
+ $rsa = openssl_pkey_new(array('private_key_bits' => $bits));
+ openssl_pkey_export($rsa, $privatekey);
+ $publickey = openssl_pkey_get_details($rsa);
+ $publickey = $publickey['key'];
+
+ if ($this->privateKeyFormat != CRYPT_RSA_PRIVATE_FORMAT_PKCS1) {
+ $privatekey = call_user_func_array(array($this, '_convertPrivateKey'), array_values($this->_parseKey($privatekey, CRYPT_RSA_PRIVATE_FORMAT_PKCS1)));
+ $publickey = call_user_func_array(array($this, '_convertPublicKey'), array_values($this->_parseKey($publickey, CRYPT_RSA_PUBLIC_FORMAT_PKCS1)));
+ }
+
+ return array(
+ 'privatekey' => $privatekey,
+ 'publickey' => $publickey,
+ 'partialkey' => false
+ );
+ }
+
+ static $e;
+ if (!isset($e)) {
+ if (!defined('CRYPT_RSA_EXPONENT')) {
+ // http://en.wikipedia.org/wiki/65537_%28number%29
+ define('CRYPT_RSA_EXPONENT', '65537');
+ }
+ if (!defined('CRYPT_RSA_COMMENT')) {
+ define('CRYPT_RSA_COMMENT', 'phpseclib-generated-key');
+ }
+ // per <http://cseweb.ucsd.edu/~hovav/dist/survey.pdf#page=5>, this number ought not result in primes smaller
+ // than 256 bits.
+ if (!defined('CRYPT_RSA_SMALLEST_PRIME')) {
+ define('CRYPT_RSA_SMALLEST_PRIME', 4096);
+ }
+
+ $e = new Math_BigInteger(CRYPT_RSA_EXPONENT);
+ }
+
+ extract($this->_generateMinMax($bits));
+ $absoluteMin = $min;
+ $temp = $bits >> 1;
+ if ($temp > CRYPT_RSA_SMALLEST_PRIME) {
+ $num_primes = floor($bits / CRYPT_RSA_SMALLEST_PRIME);
+ $temp = CRYPT_RSA_SMALLEST_PRIME;
+ } else {
+ $num_primes = 2;
+ }
+ extract($this->_generateMinMax($temp + $bits % $temp));
+ $finalMax = $max;
+ extract($this->_generateMinMax($temp));
+
+ $generator = new Math_BigInteger();
+ $generator->setRandomGenerator('crypt_random');
+
+ $n = $this->one->copy();
+ if (!empty($partial)) {
+ extract(unserialize($partial));
+ } else {
+ $exponents = $coefficients = $primes = array();
+ $lcm = array(
+ 'top' => $this->one->copy(),
+ 'bottom' => false
+ );
+ }
+
+ $start = time();
+ $i0 = count($primes) + 1;
+
+ do {
+ for ($i = $i0; $i <= $num_primes; $i++) {
+ if ($timeout !== false) {
+ $timeout-= time() - $start;
+ $start = time();
+ if ($timeout <= 0) {
+ return serialize(array(
+ 'privatekey' => '',
+ 'publickey' => '',
+ 'partialkey' => array(
+ 'primes' => $primes,
+ 'coefficients' => $coefficients,
+ 'lcm' => $lcm,
+ 'exponents' => $exponents
+ )
+ ));
+ }
+ }
+
+ if ($i == $num_primes) {
+ list($min, $temp) = $absoluteMin->divide($n);
+ if (!$temp->equals($this->zero)) {
+ $min = $min->add($this->one); // ie. ceil()
+ }
+ $primes[$i] = $generator->randomPrime($min, $finalMax, $timeout);
+ } else {
+ $primes[$i] = $generator->randomPrime($min, $max, $timeout);
+ }
+
+ if ($primes[$i] === false) { // if we've reached the timeout
+ return array(
+ 'privatekey' => '',
+ 'publickey' => '',
+ 'partialkey' => empty($primes) ? '' : serialize(array(
+ 'primes' => array_slice($primes, 0, $i - 1),
+ 'coefficients' => $coefficients,
+ 'lcm' => $lcm,
+ 'exponents' => $exponents
+ ))
+ );
+ }
+
+ // the first coefficient is calculated differently from the rest
+ // ie. instead of being $primes[1]->modInverse($primes[2]), it's $primes[2]->modInverse($primes[1])
+ if ($i > 2) {
+ $coefficients[$i] = $n->modInverse($primes[$i]);
+ }
+
+ $n = $n->multiply($primes[$i]);
+
+ $temp = $primes[$i]->subtract($this->one);
+
+ // textbook RSA implementations use Euler's totient function instead of the least common multiple.
+ // see http://en.wikipedia.org/wiki/Euler%27s_totient_function
+ $lcm['top'] = $lcm['top']->multiply($temp);
+ $lcm['bottom'] = $lcm['bottom'] === false ? $temp : $lcm['bottom']->gcd($temp);
+
+ $exponents[$i] = $e->modInverse($temp);
+ }
+
+ list($lcm) = $lcm['top']->divide($lcm['bottom']);
+ $gcd = $lcm->gcd($e);
+ $i0 = 1;
+ } while (!$gcd->equals($this->one));
+
+ $d = $e->modInverse($lcm);
+
+ $coefficients[2] = $primes[2]->modInverse($primes[1]);
+
+ // from <http://tools.ietf.org/html/rfc3447#appendix-A.1.2>:
+ // RSAPrivateKey ::= SEQUENCE {
+ // version Version,
+ // modulus INTEGER, -- n
+ // publicExponent INTEGER, -- e
+ // privateExponent INTEGER, -- d
+ // prime1 INTEGER, -- p
+ // prime2 INTEGER, -- q
+ // exponent1 INTEGER, -- d mod (p-1)
+ // exponent2 INTEGER, -- d mod (q-1)
+ // coefficient INTEGER, -- (inverse of q) mod p
+ // otherPrimeInfos OtherPrimeInfos OPTIONAL
+ // }
+
+ return array(
+ 'privatekey' => $this->_convertPrivateKey($n, $e, $d, $primes, $exponents, $coefficients),
+ 'publickey' => $this->_convertPublicKey($n, $e),
+ 'partialkey' => false
+ );
+ }
+
+ /**
+ * Convert a private key to the appropriate format.
+ *
+ * @access private
+ * @see setPrivateKeyFormat()
+ * @param String $RSAPrivateKey
+ * @return String
+ */
+ function _convertPrivateKey($n, $e, $d, $primes, $exponents, $coefficients)
+ {
+ $num_primes = count($primes);
+ $raw = array(
+ 'version' => $num_primes == 2 ? chr(0) : chr(1), // two-prime vs. multi
+ 'modulus' => $n->toBytes(true),
+ 'publicExponent' => $e->toBytes(true),
+ 'privateExponent' => $d->toBytes(true),
+ 'prime1' => $primes[1]->toBytes(true),
+ 'prime2' => $primes[2]->toBytes(true),
+ 'exponent1' => $exponents[1]->toBytes(true),
+ 'exponent2' => $exponents[2]->toBytes(true),
+ 'coefficient' => $coefficients[2]->toBytes(true)
+ );
+
+ // if the format in question does not support multi-prime rsa and multi-prime rsa was used,
+ // call _convertPublicKey() instead.
+ switch ($this->privateKeyFormat) {
+ default: // eg. CRYPT_RSA_PRIVATE_FORMAT_PKCS1
+ $components = array();
+ foreach ($raw as $name => $value) {
+ $components[$name] = pack('Ca*a*', CRYPT_RSA_ASN1_INTEGER, $this->_encodeLength(strlen($value)), $value);
+ }
+
+ $RSAPrivateKey = implode('', $components);
+
+ if ($num_primes > 2) {
+ $OtherPrimeInfos = '';
+ for ($i = 3; $i <= $num_primes; $i++) {
+ // OtherPrimeInfos ::= SEQUENCE SIZE(1..MAX) OF OtherPrimeInfo
+ //
+ // OtherPrimeInfo ::= SEQUENCE {
+ // prime INTEGER, -- ri
+ // exponent INTEGER, -- di
+ // coefficient INTEGER -- ti
+ // }
+ $OtherPrimeInfo = pack('Ca*a*', CRYPT_RSA_ASN1_INTEGER, $this->_encodeLength(strlen($primes[$i]->toBytes(true))), $primes[$i]->toBytes(true));
+ $OtherPrimeInfo.= pack('Ca*a*', CRYPT_RSA_ASN1_INTEGER, $this->_encodeLength(strlen($exponents[$i]->toBytes(true))), $exponents[$i]->toBytes(true));
+ $OtherPrimeInfo.= pack('Ca*a*', CRYPT_RSA_ASN1_INTEGER, $this->_encodeLength(strlen($coefficients[$i]->toBytes(true))), $coefficients[$i]->toBytes(true));
+ $OtherPrimeInfos.= pack('Ca*a*', CRYPT_RSA_ASN1_SEQUENCE, $this->_encodeLength(strlen($OtherPrimeInfo)), $OtherPrimeInfo);
+ }
+ $RSAPrivateKey.= pack('Ca*a*', CRYPT_RSA_ASN1_SEQUENCE, $this->_encodeLength(strlen($OtherPrimeInfos)), $OtherPrimeInfos);
+ }
+
+ $RSAPrivateKey = pack('Ca*a*', CRYPT_RSA_ASN1_SEQUENCE, $this->_encodeLength(strlen($RSAPrivateKey)), $RSAPrivateKey);
+
+ if (!empty($this->password)) {
+ $iv = $this->_random(8);
+ $symkey = pack('H*', md5($this->password . $iv)); // symkey is short for symmetric key
+ $symkey.= substr(pack('H*', md5($symkey . $this->password . $iv)), 0, 8);
+ if (!class_exists('Crypt_TripleDES')) {
+ require_once('Crypt/TripleDES.php');
+ }
+ $des = new Crypt_TripleDES();
+ $des->setKey($symkey);
+ $des->setIV($iv);
+ $iv = strtoupper(bin2hex($iv));
+ $RSAPrivateKey = "-----BEGIN RSA PRIVATE KEY-----\r\n" .
+ "Proc-Type: 4,ENCRYPTED\r\n" .
+ "DEK-Info: DES-EDE3-CBC,$iv\r\n" .
+ "\r\n" .
+ chunk_split(base64_encode($des->encrypt($RSAPrivateKey))) .
+ '-----END RSA PRIVATE KEY-----';
+ } else {
+ $RSAPrivateKey = "-----BEGIN RSA PRIVATE KEY-----\r\n" .
+ chunk_split(base64_encode($RSAPrivateKey)) .
+ '-----END RSA PRIVATE KEY-----';
+ }
+
+ return $RSAPrivateKey;
+ }
+ }
+
+ /**
+ * Convert a public key to the appropriate format
+ *
+ * @access private
+ * @see setPublicKeyFormat()
+ * @param String $RSAPrivateKey
+ * @return String
+ */
+ function _convertPublicKey($n, $e)
+ {
+ $modulus = $n->toBytes(true);
+ $publicExponent = $e->toBytes(true);
+
+ switch ($this->publicKeyFormat) {
+ case CRYPT_RSA_PUBLIC_FORMAT_RAW:
+ return array('e' => $e->copy(), 'n' => $n->copy());
+ case CRYPT_RSA_PUBLIC_FORMAT_OPENSSH:
+ // from <http://tools.ietf.org/html/rfc4253#page-15>:
+ // string "ssh-rsa"
+ // mpint e
+ // mpint n
+ $RSAPublicKey = pack('Na*Na*Na*', strlen('ssh-rsa'), 'ssh-rsa', strlen($publicExponent), $publicExponent, strlen($modulus), $modulus);
+ $RSAPublicKey = 'ssh-rsa ' . base64_encode($RSAPublicKey) . ' ' . CRYPT_RSA_COMMENT;
+
+ return $RSAPublicKey;
+ default: // eg. CRYPT_RSA_PUBLIC_FORMAT_PKCS1
+ // from <http://tools.ietf.org/html/rfc3447#appendix-A.1.1>:
+ // RSAPublicKey ::= SEQUENCE {
+ // modulus INTEGER, -- n
+ // publicExponent INTEGER -- e
+ // }
+ $components = array(
+ 'modulus' => pack('Ca*a*', CRYPT_RSA_ASN1_INTEGER, $this->_encodeLength(strlen($modulus)), $modulus),
+ 'publicExponent' => pack('Ca*a*', CRYPT_RSA_ASN1_INTEGER, $this->_encodeLength(strlen($publicExponent)), $publicExponent)
+ );
+
+ $RSAPublicKey = pack('Ca*a*a*',
+ CRYPT_RSA_ASN1_SEQUENCE, $this->_encodeLength(strlen($components['modulus']) + strlen($components['publicExponent'])),
+ $components['modulus'], $components['publicExponent']
+ );
+
+ $RSAPublicKey = "-----BEGIN PUBLIC KEY-----\r\n" .
+ chunk_split(base64_encode($RSAPublicKey)) .
+ '-----END PUBLIC KEY-----';
+
+ return $RSAPublicKey;
+ }
+ }
+
+ /**
+ * Break a public or private key down into its constituant components
+ *
+ * @access private
+ * @see _convertPublicKey()
+ * @see _convertPrivateKey()
+ * @param String $key
+ * @param Integer $type
+ * @return Array
+ */
+ function _parseKey($key, $type)
+ {
+ switch ($type) {
+ case CRYPT_RSA_PUBLIC_FORMAT_RAW:
+ if (!is_array($key)) {
+ return false;
+ }
+ $components = array();
+ switch (true) {
+ case isset($key['e']):
+ $components['publicExponent'] = $key['e']->copy();
+ break;
+ case isset($key['exponent']):
+ $components['publicExponent'] = $key['exponent']->copy();
+ break;
+ case isset($key['publicExponent']):
+ $components['publicExponent'] = $key['publicExponent']->copy();
+ break;
+ case isset($key[0]):
+ $components['publicExponent'] = $key[0]->copy();
+ }
+ switch (true) {
+ case isset($key['n']):
+ $components['modulus'] = $key['n']->copy();
+ break;
+ case isset($key['modulo']):
+ $components['modulus'] = $key['modulo']->copy();
+ break;
+ case isset($key['modulus']):
+ $components['modulus'] = $key['modulus']->copy();
+ break;
+ case isset($key[1]):
+ $components['modulus'] = $key[1]->copy();
+ }
+ return $components;
+ case CRYPT_RSA_PRIVATE_FORMAT_PKCS1:
+ case CRYPT_RSA_PUBLIC_FORMAT_PKCS1:
+ /* Although PKCS#1 proposes a format that public and private keys can use, encrypting them is
+ "outside the scope" of PKCS#1. PKCS#1 then refers you to PKCS#12 and PKCS#15 if you're wanting to
+ protect private keys, however, that's not what OpenSSL* does. OpenSSL protects private keys by adding
+ two new "fields" to the key - DEK-Info and Proc-Type. These fields are discussed here:
+
+ http://tools.ietf.org/html/rfc1421#section-4.6.1.1
+ http://tools.ietf.org/html/rfc1421#section-4.6.1.3
+
+ DES-EDE3-CBC as an algorithm, however, is not discussed anywhere, near as I can tell.
+ DES-CBC and DES-EDE are discussed in RFC1423, however, DES-EDE3-CBC isn't, nor is its key derivation
+ function. As is, the definitive authority on this encoding scheme isn't the IETF but rather OpenSSL's
+ own implementation. ie. the implementation *is* the standard and any bugs that may exist in that
+ implementation are part of the standard, as well.
+
+ * OpenSSL is the de facto standard. It's utilized by OpenSSH and other projects */
+ if (preg_match('#DEK-Info: (.+),(.+)#', $key, $matches)) {
+ $iv = pack('H*', trim($matches[2]));
+ $symkey = pack('H*', md5($this->password . $iv)); // symkey is short for symmetric key
+ $symkey.= substr(pack('H*', md5($symkey . $this->password . $iv)), 0, 8);
+ $ciphertext = preg_replace('#.+(\r|\n|\r\n)\1|[\r\n]|-.+-#s', '', $key);
+ $ciphertext = preg_match('#^[a-zA-Z\d/+]*={0,2}$#', $ciphertext) ? base64_decode($ciphertext) : false;
+ if ($ciphertext === false) {
+ $ciphertext = $key;
+ }
+ switch ($matches[1]) {
+ case 'DES-EDE3-CBC':
+ if (!class_exists('Crypt_TripleDES')) {
+ require_once('Crypt/TripleDES.php');
+ }
+ $crypto = new Crypt_TripleDES();
+ break;
+ case 'DES-CBC':
+ if (!class_exists('Crypt_DES')) {
+ require_once('Crypt/DES.php');
+ }
+ $crypto = new Crypt_DES();
+ break;
+ default:
+ return false;
+ }
+ $crypto->setKey($symkey);
+ $crypto->setIV($iv);
+ $decoded = $crypto->decrypt($ciphertext);
+ } else {
+ $decoded = preg_replace('#-.+-|[\r\n]#', '', $key);
+ $decoded = preg_match('#^[a-zA-Z\d/+]*={0,2}$#', $decoded) ? base64_decode($decoded) : false;
+ }
+
+ if ($decoded !== false) {
+ $key = $decoded;
+ }
+
+ $components = array();
+
+ if (ord($this->_string_shift($key)) != CRYPT_RSA_ASN1_SEQUENCE) {
+ return false;
+ }
+ if ($this->_decodeLength($key) != strlen($key)) {
+ return false;
+ }
+
+ $tag = ord($this->_string_shift($key));
+ if ($tag == CRYPT_RSA_ASN1_SEQUENCE) {
+ /* intended for keys for which OpenSSL's asn1parse returns the following:
+
+ 0:d=0 hl=4 l= 290 cons: SEQUENCE
+ 4:d=1 hl=2 l= 13 cons: SEQUENCE
+ 6:d=2 hl=2 l= 9 prim: OBJECT :rsaEncryption
+ 17:d=2 hl=2 l= 0 prim: NULL
+ 19:d=1 hl=4 l= 271 prim: BIT STRING */
+ $this->_string_shift($key, $this->_decodeLength($key));
+ $this->_string_shift($key); // skip over the BIT STRING tag
+ $this->_decodeLength($key); // skip over the BIT STRING length
+ // "The initial octet shall encode, as an unsigned binary integer wtih bit 1 as the least significant bit, the number of
+ // unused bits in teh final subsequent octet. The number shall be in the range zero to seven."
+ // -- http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf (section 8.6.2.2)
+ $this->_string_shift($key);
+ if (ord($this->_string_shift($key)) != CRYPT_RSA_ASN1_SEQUENCE) {
+ return false;
+ }
+ if ($this->_decodeLength($key) != strlen($key)) {
+ return false;
+ }
+ $tag = ord($this->_string_shift($key));
+ }
+ if ($tag != CRYPT_RSA_ASN1_INTEGER) {
+ return false;
+ }
+
+ $length = $this->_decodeLength($key);
+ $temp = $this->_string_shift($key, $length);
+ if (strlen($temp) != 1 || ord($temp) > 2) {
+ $components['modulus'] = new Math_BigInteger($temp, -256);
+ $this->_string_shift($key); // skip over CRYPT_RSA_ASN1_INTEGER
+ $length = $this->_decodeLength($key);
+ $components[$type == CRYPT_RSA_PUBLIC_FORMAT_PKCS1 ? 'publicExponent' : 'privateExponent'] = new Math_BigInteger($this->_string_shift($key, $length), -256);
+
+ return $components;
+ }
+ if (ord($this->_string_shift($key)) != CRYPT_RSA_ASN1_INTEGER) {
+ return false;
+ }
+ $length = $this->_decodeLength($key);
+ $components['modulus'] = new Math_BigInteger($this->_string_shift($key, $length), -256);
+ $this->_string_shift($key);
+ $length = $this->_decodeLength($key);
+ $components['publicExponent'] = new Math_BigInteger($this->_string_shift($key, $length), -256);
+ $this->_string_shift($key);
+ $length = $this->_decodeLength($key);
+ $components['privateExponent'] = new Math_BigInteger($this->_string_shift($key, $length), -256);
+ $this->_string_shift($key);
+ $length = $this->_decodeLength($key);
+ $components['primes'] = array(1 => new Math_BigInteger($this->_string_shift($key, $length), -256));
+ $this->_string_shift($key);
+ $length = $this->_decodeLength($key);
+ $components['primes'][] = new Math_BigInteger($this->_string_shift($key, $length), -256);
+ $this->_string_shift($key);
+ $length = $this->_decodeLength($key);
+ $components['exponents'] = array(1 => new Math_BigInteger($this->_string_shift($key, $length), -256));
+ $this->_string_shift($key);
+ $length = $this->_decodeLength($key);
+ $components['exponents'][] = new Math_BigInteger($this->_string_shift($key, $length), -256);
+ $this->_string_shift($key);
+ $length = $this->_decodeLength($key);
+ $components['coefficients'] = array(2 => new Math_BigInteger($this->_string_shift($key, $length), -256));
+
+ if (!empty($key)) {
+ if (ord($this->_string_shift($key)) != CRYPT_RSA_ASN1_SEQUENCE) {
+ return false;
+ }
+ $this->_decodeLength($key);
+ while (!empty($key)) {
+ if (ord($this->_string_shift($key)) != CRYPT_RSA_ASN1_SEQUENCE) {
+ return false;
+ }
+ $this->_decodeLength($key);
+ $key = substr($key, 1);
+ $length = $this->_decodeLength($key);
+ $components['primes'][] = new Math_BigInteger($this->_string_shift($key, $length), -256);
+ $this->_string_shift($key);
+ $length = $this->_decodeLength($key);
+ $components['exponents'][] = new Math_BigInteger($this->_string_shift($key, $length), -256);
+ $this->_string_shift($key);
+ $length = $this->_decodeLength($key);
+ $components['coefficients'][] = new Math_BigInteger($this->_string_shift($key, $length), -256);
+ }
+ }
+
+ return $components;
+ case CRYPT_RSA_PUBLIC_FORMAT_OPENSSH:
+ $key = base64_decode(preg_replace('#^ssh-rsa | .+$#', '', $key));
+ if ($key === false) {
+ return false;
+ }
+
+ $cleanup = substr($key, 0, 11) == "\0\0\0\7ssh-rsa";
+
+ extract(unpack('Nlength', $this->_string_shift($key, 4)));
+ $publicExponent = new Math_BigInteger($this->_string_shift($key, $length), -256);
+ extract(unpack('Nlength', $this->_string_shift($key, 4)));
+ $modulus = new Math_BigInteger($this->_string_shift($key, $length), -256);
+
+ if ($cleanup && strlen($key)) {
+ extract(unpack('Nlength', $this->_string_shift($key, 4)));
+ return array(
+ 'modulus' => new Math_BigInteger($this->_string_shift($key, $length), -256),
+ 'publicExponent' => $modulus
+ );
+ } else {
+ return array(
+ 'modulus' => $modulus,
+ 'publicExponent' => $publicExponent
+ );
+ }
+ }
+ }
+
+ /**
+ * Loads a public or private key
+ *
+ * Returns true on success and false on failure (ie. an incorrect password was provided or the key was malformed)
+ *
+ * @access public
+ * @param String $key
+ * @param Integer $type optional
+ */
+ function loadKey($key, $type = CRYPT_RSA_PRIVATE_FORMAT_PKCS1)
+ {
+ $components = $this->_parseKey($key, $type);
+ if ($components === false) {
+ return false;
+ }
+
+ $this->modulus = $components['modulus'];
+ $this->k = strlen($this->modulus->toBytes());
+ $this->exponent = isset($components['privateExponent']) ? $components['privateExponent'] : $components['publicExponent'];
+ if (isset($components['primes'])) {
+ $this->primes = $components['primes'];
+ $this->exponents = $components['exponents'];
+ $this->coefficients = $components['coefficients'];
+ $this->publicExponent = $components['publicExponent'];
+ } else {
+ $this->primes = array();
+ $this->exponents = array();
+ $this->coefficients = array();
+ $this->publicExponent = false;
+ }
+
+ return true;
+ }
+
+ /**
+ * Sets the password
+ *
+ * Private keys can be encrypted with a password. To unset the password, pass in the empty string or false.
+ * Or rather, pass in $password such that empty($password) is true.
+ *
+ * @see createKey()
+ * @see loadKey()
+ * @access public
+ * @param String $password
+ */
+ function setPassword($password)
+ {
+ $this->password = $password;
+ }
+
+ /**
+ * Defines the public key
+ *
+ * Some private key formats define the public exponent and some don't. Those that don't define it are problematic when
+ * used in certain contexts. For example, in SSH-2, RSA authentication works by sending the public key along with a
+ * message signed by the private key to the server. The SSH-2 server looks the public key up in an index of public keys
+ * and if it's present then proceeds to verify the signature. Problem is, if your private key doesn't include the public
+ * exponent this won't work unless you manually add the public exponent.
+ *
+ * Do note that when a new key is loaded the index will be cleared.
+ *
+ * Returns true on success, false on failure
+ *
+ * @see getPublicKey()
+ * @access public
+ * @param String $key
+ * @param Integer $type optional
+ * @return Boolean
+ */
+ function setPublicKey($key, $type = CRYPT_RSA_PUBLIC_FORMAT_PKCS1)
+ {
+ $components = $this->_parseKey($key, $type);
+ if (empty($this->modulus) || !$this->modulus->equals($components['modulus'])) {
+ return false;
+ }
+ $this->publicExponent = $components['publicExponent'];
+ }
+
+ /**
+ * Returns the public key
+ *
+ * The public key is only returned under two circumstances - if the private key had the public key embedded within it
+ * or if the public key was set via setPublicKey(). If the currently loaded key is supposed to be the public key this
+ * function won't return it since this library, for the most part, doesn't distinguish between public and private keys.
+ *
+ * @see getPublicKey()
+ * @access public
+ * @param String $key
+ * @param Integer $type optional
+ */
+ function getPublicKey($type = CRYPT_RSA_PUBLIC_FORMAT_PKCS1)
+ {
+ if (empty($this->modulus) || empty($this->publicExponent)) {
+ return false;
+ }
+
+ $oldFormat = $this->publicKeyFormat;
+ $this->publicKeyFormat = $type;
+ $temp = $this->_convertPublicKey($this->modulus, $this->publicExponent);
+ $this->publicKeyFormat = $oldFormat;
+ return $temp;
+ }
+
+ /**
+ * Generates the smallest and largest numbers requiring $bits bits
+ *
+ * @access private
+ * @param Integer $bits
+ * @return Array
+ */
+ function _generateMinMax($bits)
+ {
+ $bytes = $bits >> 3;
+ $min = str_repeat(chr(0), $bytes);
+ $max = str_repeat(chr(0xFF), $bytes);
+ $msb = $bits & 7;
+ if ($msb) {
+ $min = chr(1 << ($msb - 1)) . $min;
+ $max = chr((1 << $msb) - 1) . $max;
+ } else {
+ $min[0] = chr(0x80);
+ }
+
+ return array(
+ 'min' => new Math_BigInteger($min, 256),
+ 'max' => new Math_BigInteger($max, 256)
+ );
+ }
+
+ /**
+ * DER-decode the length
+ *
+ * DER supports lengths up to (2**8)**127, however, we'll only support lengths up to (2**8)**4. See
+ * {@link http://itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf#p=13 X.690 § 8.1.3} for more information.
+ *
+ * @access private
+ * @param String $string
+ * @return Integer
+ */
+ function _decodeLength(&$string)
+ {
+ $length = ord($this->_string_shift($string));
+ if ( $length & 0x80 ) { // definite length, long form
+ $length&= 0x7F;
+ $temp = $this->_string_shift($string, $length);
+ list(, $length) = unpack('N', substr(str_pad($temp, 4, chr(0), STR_PAD_LEFT), -4));
+ }
+ return $length;
+ }
+
+ /**
+ * DER-encode the length
+ *
+ * DER supports lengths up to (2**8)**127, however, we'll only support lengths up to (2**8)**4. See
+ * {@link http://itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf#p=13 X.690 § 8.1.3} for more information.
+ *
+ * @access private
+ * @param Integer $length
+ * @return String
+ */
+ function _encodeLength($length)
+ {
+ if ($length <= 0x7F) {
+ return chr($length);
+ }
+
+ $temp = ltrim(pack('N', $length), chr(0));
+ return pack('Ca*', 0x80 | strlen($temp), $temp);
+ }
+
+ /**
+ * String Shift
+ *
+ * Inspired by array_shift
+ *
+ * @param String $string
+ * @param optional Integer $index
+ * @return String
+ * @access private
+ */
+ function _string_shift(&$string, $index = 1)
+ {
+ $substr = substr($string, 0, $index);
+ $string = substr($string, $index);
+ return $substr;
+ }
+
+ /**
+ * Determines the private key format
+ *
+ * @see createKey()
+ * @access public
+ * @param Integer $format
+ */
+ function setPrivateKeyFormat($format)
+ {
+ $this->privateKeyFormat = $format;
+ }
+
+ /**
+ * Determines the public key format
+ *
+ * @see createKey()
+ * @access public
+ * @param Integer $format
+ */
+ function setPublicKeyFormat($format)
+ {
+ $this->publicKeyFormat = $format;
+ }
+
+ /**
+ * Determines which hashing function should be used
+ *
+ * Used with signature production / verification and (if the encryption mode is CRYPT_RSA_ENCRYPTION_OAEP) encryption and
+ * decryption. If $hash isn't supported, sha1 is used.
+ *
+ * @access public
+ * @param String $hash
+ */
+ function setHash($hash)
+ {
+ // Crypt_Hash supports algorithms that PKCS#1 doesn't support. md5-96 and sha1-96, for example.
+ switch ($hash) {
+ case 'md2':
+ case 'md5':
+ case 'sha1':
+ case 'sha256':
+ case 'sha384':
+ case 'sha512':
+ $this->hash = new Crypt_Hash($hash);
+ $this->hashName = $hash;
+ break;
+ default:
+ $this->hash = new Crypt_Hash('sha1');
+ $this->hashName = 'sha1';
+ }
+ $this->hLen = $this->hash->getLength();
+ }
+
+ /**
+ * Determines which hashing function should be used for the mask generation function
+ *
+ * The mask generation function is used by CRYPT_RSA_ENCRYPTION_OAEP and CRYPT_RSA_SIGNATURE_PSS and although it's
+ * best if Hash and MGFHash are set to the same thing this is not a requirement.
+ *
+ * @access public
+ * @param String $hash
+ */
+ function setMGFHash($hash)
+ {
+ // Crypt_Hash supports algorithms that PKCS#1 doesn't support. md5-96 and sha1-96, for example.
+ switch ($hash) {
+ case 'md2':
+ case 'md5':
+ case 'sha1':
+ case 'sha256':
+ case 'sha384':
+ case 'sha512':
+ $this->mgfHash = new Crypt_Hash($hash);
+ break;
+ default:
+ $this->mgfHash = new Crypt_Hash('sha1');
+ }
+ $this->mgfHLen = $this->mgfHash->getLength();
+ }
+
+ /**
+ * Determines the salt length
+ *
+ * To quote from {@link http://tools.ietf.org/html/rfc3447#page-38 RFC3447#page-38}:
+ *
+ * Typical salt lengths in octets are hLen (the length of the output
+ * of the hash function Hash) and 0.
+ *
+ * @access public
+ * @param Integer $format
+ */
+ function setSaltLength($sLen)
+ {
+ $this->sLen = $sLen;
+ }
+
+ /**
+ * Generates a random string x bytes long
+ *
+ * @access public
+ * @param Integer $bytes
+ * @param optional Integer $nonzero
+ * @return String
+ */
+ function _random($bytes, $nonzero = false)
+ {
+ $temp = '';
+ if ($nonzero) {
+ for ($i = 0; $i < $bytes; $i++) {
+ $temp.= chr(crypt_random(1, 255));
+ }
+ } else {
+ $ints = ($bytes + 1) >> 2;
+ for ($i = 0; $i < $ints; $i++) {
+ $temp.= pack('N', crypt_random());
+ }
+ $temp = substr($temp, 0, $bytes);
+ }
+ return $temp;
+ }
+
+ /**
+ * Integer-to-Octet-String primitive
+ *
+ * See {@link http://tools.ietf.org/html/rfc3447#section-4.1 RFC3447#section-4.1}.
+ *
+ * @access private
+ * @param Math_BigInteger $x
+ * @param Integer $xLen
+ * @return String
+ */
+ function _i2osp($x, $xLen)
+ {
+ $x = $x->toBytes();
+ if (strlen($x) > $xLen) {
+ user_error('Integer too large', E_USER_NOTICE);
+ return false;
+ }
+ return str_pad($x, $xLen, chr(0), STR_PAD_LEFT);
+ }
+
+ /**
+ * Octet-String-to-Integer primitive
+ *
+ * See {@link http://tools.ietf.org/html/rfc3447#section-4.2 RFC3447#section-4.2}.
+ *
+ * @access private
+ * @param String $x
+ * @return Math_BigInteger
+ */
+ function _os2ip($x)
+ {
+ return new Math_BigInteger($x, 256);
+ }
+
+ /**
+ * Exponentiate with or without Chinese Remainder Theorem
+ *
+ * See {@link http://tools.ietf.org/html/rfc3447#section-5.1.1 RFC3447#section-5.1.2}.
+ *
+ * @access private
+ * @param Math_BigInteger $x
+ * @return Math_BigInteger
+ */
+ function _exponentiate($x)
+ {
+ if (empty($this->primes) || empty($this->coefficients) || empty($this->exponents)) {
+ return $x->modPow($this->exponent, $this->modulus);
+ }
+
+ $num_primes = count($this->primes);
+
+ if (defined('CRYPT_RSA_DISABLE_BLINDING')) {
+ $m_i = array(
+ 1 => $x->modPow($this->exponents[1], $this->primes[1]),
+ 2 => $x->modPow($this->exponents[2], $this->primes[2])
+ );
+ $h = $m_i[1]->subtract($m_i[2]);
+ $h = $h->multiply($this->coefficients[2]);
+ list(, $h) = $h->divide($this->primes[1]);
+ $m = $m_i[2]->add($h->multiply($this->primes[2]));
+
+ $r = $this->primes[1];
+ for ($i = 3; $i <= $num_primes; $i++) {
+ $m_i = $x->modPow($this->exponents[$i], $this->primes[$i]);
+
+ $r = $r->multiply($this->primes[$i - 1]);
+
+ $h = $m_i->subtract($m);
+ $h = $h->multiply($this->coefficients[$i]);
+ list(, $h) = $h->divide($this->primes[$i]);
+
+ $m = $m->add($r->multiply($h));
+ }
+ } else {
+ $smallest = $this->primes[1];
+ for ($i = 2; $i <= $num_primes; $i++) {
+ if ($smallest->compare($this->primes[$i]) > 0) {
+ $smallest = $this->primes[$i];
+ }
+ }
+
+ $one = new Math_BigInteger(1);
+ $one->setRandomGenerator('crypt_random');
+
+ $r = $one->random($one, $smallest->subtract($one));
+
+ $m_i = array(
+ 1 => $this->_blind($x, $r, 1),
+ 2 => $this->_blind($x, $r, 2)
+ );
+ $h = $m_i[1]->subtract($m_i[2]);
+ $h = $h->multiply($this->coefficients[2]);
+ list(, $h) = $h->divide($this->primes[1]);
+ $m = $m_i[2]->add($h->multiply($this->primes[2]));
+
+ $r = $this->primes[1];
+ for ($i = 3; $i <= $num_primes; $i++) {
+ $m_i = $this->_blind($x, $r, $i);
+
+ $r = $r->multiply($this->primes[$i - 1]);
+
+ $h = $m_i->subtract($m);
+ $h = $h->multiply($this->coefficients[$i]);
+ list(, $h) = $h->divide($this->primes[$i]);
+
+ $m = $m->add($r->multiply($h));
+ }
+ }
+
+ return $m;
+ }
+
+ /**
+ * Performs RSA Blinding
+ *
+ * Protects against timing attacks by employing RSA Blinding.
+ * Returns $x->modPow($this->exponents[$i], $this->primes[$i])
+ *
+ * @access private
+ * @param Math_BigInteger $x
+ * @param Math_BigInteger $r
+ * @param Integer $i
+ * @return Math_BigInteger
+ */
+ function _blind($x, $r, $i)
+ {
+ $x = $x->multiply($r->modPow($this->publicExponent, $this->primes[$i]));
+
+ $x = $x->modPow($this->exponents[$i], $this->primes[$i]);
+
+ $r = $r->modInverse($this->primes[$i]);
+ $x = $x->multiply($r);
+ list(, $x) = $x->divide($this->primes[$i]);
+
+ return $x;
+ }
+
+ /**
+ * RSAEP
+ *
+ * See {@link http://tools.ietf.org/html/rfc3447#section-5.1.1 RFC3447#section-5.1.1}.
+ *
+ * @access private
+ * @param Math_BigInteger $m
+ * @return Math_BigInteger
+ */
+ function _rsaep($m)
+ {
+ if ($m->compare($this->zero) < 0 || $m->compare($this->modulus) > 0) {
+ user_error('Message representative out of range', E_USER_NOTICE);
+ return false;
+ }
+ return $this->_exponentiate($m);
+ }
+
+ /**
+ * RSADP
+ *
+ * See {@link http://tools.ietf.org/html/rfc3447#section-5.1.2 RFC3447#section-5.1.2}.
+ *
+ * @access private
+ * @param Math_BigInteger $c
+ * @return Math_BigInteger
+ */
+ function _rsadp($c)
+ {
+ if ($c->compare($this->zero) < 0 || $c->compare($this->modulus) > 0) {
+ user_error('Ciphertext representative out of range', E_USER_NOTICE);
+ return false;
+ }
+ return $this->_exponentiate($c);
+ }
+
+ /**
+ * RSASP1
+ *
+ * See {@link http://tools.ietf.org/html/rfc3447#section-5.2.1 RFC3447#section-5.2.1}.
+ *
+ * @access private
+ * @param Math_BigInteger $m
+ * @return Math_BigInteger
+ */
+ function _rsasp1($m)
+ {
+ if ($m->compare($this->zero) < 0 || $m->compare($this->modulus) > 0) {
+ user_error('Message representative out of range', E_USER_NOTICE);
+ return false;
+ }
+ return $this->_exponentiate($m);
+ }
+
+ /**
+ * RSAVP1
+ *
+ * See {@link http://tools.ietf.org/html/rfc3447#section-5.2.2 RFC3447#section-5.2.2}.
+ *
+ * @access private
+ * @param Math_BigInteger $s
+ * @return Math_BigInteger
+ */
+ function _rsavp1($s)
+ {
+ if ($s->compare($this->zero) < 0 || $s->compare($this->modulus) > 0) {
+ user_error('Signature representative out of range', E_USER_NOTICE);
+ return false;
+ }
+ return $this->_exponentiate($s);
+ }
+
+ /**
+ * MGF1
+ *
+ * See {@link http://tools.ietf.org/html/rfc3447#appendix-B.2.1 RFC3447#appendix-B.2.1}.
+ *
+ * @access private
+ * @param String $mgfSeed
+ * @param Integer $mgfLen
+ * @return String
+ */
+ function _mgf1($mgfSeed, $maskLen)
+ {
+ // if $maskLen would yield strings larger than 4GB, PKCS#1 suggests a "Mask too long" error be output.
+
+ $t = '';
+ $count = ceil($maskLen / $this->mgfHLen);
+ for ($i = 0; $i < $count; $i++) {
+ $c = pack('N', $i);
+ $t.= $this->mgfHash->hash($mgfSeed . $c);
+ }
+
+ return substr($t, 0, $maskLen);
+ }
+
+ /**
+ * RSAES-OAEP-ENCRYPT
+ *
+ * See {@link http://tools.ietf.org/html/rfc3447#section-7.1.1 RFC3447#section-7.1.1} and
+ * {http://en.wikipedia.org/wiki/Optimal_Asymmetric_Encryption_Padding OAES}.
+ *
+ * @access private
+ * @param String $m
+ * @param String $l
+ * @return String
+ */
+ function _rsaes_oaep_encrypt($m, $l = '')
+ {
+ $mLen = strlen($m);
+
+ // Length checking
+
+ // if $l is larger than two million terrabytes and you're using sha1, PKCS#1 suggests a "Label too long" error
+ // be output.
+
+ if ($mLen > $this->k - 2 * $this->hLen - 2) {
+ user_error('Message too long', E_USER_NOTICE);
+ return false;
+ }
+
+ // EME-OAEP encoding
+
+ $lHash = $this->hash->hash($l);
+ $ps = str_repeat(chr(0), $this->k - $mLen - 2 * $this->hLen - 2);
+ $db = $lHash . $ps . chr(1) . $m;
+ $seed = $this->_random($this->hLen);
+ $dbMask = $this->_mgf1($seed, $this->k - $this->hLen - 1);
+ $maskedDB = $db ^ $dbMask;
+ $seedMask = $this->_mgf1($maskedDB, $this->hLen);
+ $maskedSeed = $seed ^ $seedMask;
+ $em = chr(0) . $maskedSeed . $maskedDB;
+
+ // RSA encryption
+
+ $m = $this->_os2ip($em);
+ $c = $this->_rsaep($m);
+ $c = $this->_i2osp($c, $this->k);
+
+ // Output the ciphertext C
+
+ return $c;
+ }
+
+ /**
+ * RSAES-OAEP-DECRYPT
+ *
+ * See {@link http://tools.ietf.org/html/rfc3447#section-7.1.2 RFC3447#section-7.1.2}. The fact that the error
+ * messages aren't distinguishable from one another hinders debugging, but, to quote from RFC3447#section-7.1.2:
+ *
+ * Note. Care must be taken to ensure that an opponent cannot
+ * distinguish the different error conditions in Step 3.g, whether by
+ * error message or timing, or, more generally, learn partial
+ * information about the encoded message EM. Otherwise an opponent may
+ * be able to obtain useful information about the decryption of the
+ * ciphertext C, leading to a chosen-ciphertext attack such as the one
+ * observed by Manger [36].
+ *
+ * As for $l... to quote from {@link http://tools.ietf.org/html/rfc3447#page-17 RFC3447#page-17}:
+ *
+ * Both the encryption and the decryption operations of RSAES-OAEP take
+ * the value of a label L as input. In this version of PKCS #1, L is
+ * the empty string; other uses of the label are outside the scope of
+ * this document.
+ *
+ * @access private
+ * @param String $c
+ * @param String $l
+ * @return String
+ */
+ function _rsaes_oaep_decrypt($c, $l = '')
+ {
+ // Length checking
+
+ // if $l is larger than two million terrabytes and you're using sha1, PKCS#1 suggests a "Label too long" error
+ // be output.
+
+ if (strlen($c) != $this->k || $this->k < 2 * $this->hLen + 2) {
+ user_error('Decryption error', E_USER_NOTICE);
+ return false;
+ }
+
+ // RSA decryption
+
+ $c = $this->_os2ip($c);
+ $m = $this->_rsadp($c);
+ if ($m === false) {
+ user_error('Decryption error', E_USER_NOTICE);
+ return false;
+ }
+ $em = $this->_i2osp($m, $this->k);
+
+ // EME-OAEP decoding
+
+ $lHash = $this->hash->hash($l);
+ $y = ord($em[0]);
+ $maskedSeed = substr($em, 1, $this->hLen);
+ $maskedDB = substr($em, $this->hLen + 1);
+ $seedMask = $this->_mgf1($maskedDB, $this->hLen);
+ $seed = $maskedSeed ^ $seedMask;
+ $dbMask = $this->_mgf1($seed, $this->k - $this->hLen - 1);
+ $db = $maskedDB ^ $dbMask;
+ $lHash2 = substr($db, 0, $this->hLen);
+ $m = substr($db, $this->hLen);
+ if ($lHash != $lHash2) {
+ user_error('Decryption error', E_USER_NOTICE);
+ return false;
+ }
+ $m = ltrim($m, chr(0));
+ if (ord($m[0]) != 1) {
+ user_error('Decryption error', E_USER_NOTICE);
+ return false;
+ }
+
+ // Output the message M
+
+ return substr($m, 1);
+ }
+
+ /**
+ * RSAES-PKCS1-V1_5-ENCRYPT
+ *
+ * See {@link http://tools.ietf.org/html/rfc3447#section-7.2.1 RFC3447#section-7.2.1}.
+ *
+ * @access private
+ * @param String $m
+ * @return String
+ */
+ function _rsaes_pkcs1_v1_5_encrypt($m)
+ {
+ $mLen = strlen($m);
+
+ // Length checking
+
+ if ($mLen > $this->k - 11) {
+ user_error('Message too long', E_USER_NOTICE);
+ return false;
+ }
+
+ // EME-PKCS1-v1_5 encoding
+
+ $ps = $this->_random($this->k - $mLen - 3, true);
+ $em = chr(0) . chr(2) . $ps . chr(0) . $m;
+
+ // RSA encryption
+ $m = $this->_os2ip($em);
+ $c = $this->_rsaep($m);
+ $c = $this->_i2osp($c, $this->k);
+
+ // Output the ciphertext C
+
+ return $c;
+ }
+
+ /**
+ * RSAES-PKCS1-V1_5-DECRYPT
+ *
+ * See {@link http://tools.ietf.org/html/rfc3447#section-7.2.2 RFC3447#section-7.2.2}.
+ *
+ * For compatability purposes, this function departs slightly from the description given in RFC3447.
+ * The reason being that RFC2313#section-8.1 (PKCS#1 v1.5) states that ciphertext's encrypted by the
+ * private key should have the second byte set to either 0 or 1 and that ciphertext's encrypted by the
+ * public key should have the second byte set to 2. In RFC3447 (PKCS#1 v2.1), the second byte is supposed
+ * to be 2 regardless of which key is used. for compatability purposes, we'll just check to make sure the
+ * second byte is 2 or less. If it is, we'll accept the decrypted string as valid.
+ *
+ * As a consequence of this, a private key encrypted ciphertext produced with Crypt_RSA may not decrypt
+ * with a strictly PKCS#1 v1.5 compliant RSA implementation. Public key encrypted ciphertext's should but
+ * not private key encrypted ciphertext's.
+ *
+ * @access private
+ * @param String $c
+ * @return String
+ */
+ function _rsaes_pkcs1_v1_5_decrypt($c)
+ {
+ // Length checking
+
+ if (strlen($c) != $this->k) { // or if k < 11
+ user_error('Decryption error', E_USER_NOTICE);
+ return false;
+ }
+
+ // RSA decryption
+
+ $c = $this->_os2ip($c);
+ $m = $this->_rsadp($c);
+ if ($m === false) {
+ user_error('Decryption error', E_USER_NOTICE);
+ return false;
+ }
+ $em = $this->_i2osp($m, $this->k);
+
+ // EME-PKCS1-v1_5 decoding
+
+ if (ord($em[0]) != 0 || ord($em[1]) > 2) {
+ user_error('Decryption error', E_USER_NOTICE);
+ return false;
+ }
+
+ $ps = substr($em, 2, strpos($em, chr(0), 2) - 2);
+ $m = substr($em, strlen($ps) + 3);
+
+ if (strlen($ps) < 8) {
+ user_error('Decryption error', E_USER_NOTICE);
+ return false;
+ }
+
+ // Output M
+
+ return $m;
+ }
+
+ /**
+ * EMSA-PSS-ENCODE
+ *
+ * See {@link http://tools.ietf.org/html/rfc3447#section-9.1.1 RFC3447#section-9.1.1}.
+ *
+ * @access private
+ * @param String $m
+ * @param Integer $emBits
+ */
+ function _emsa_pss_encode($m, $emBits)
+ {
+ // if $m is larger than two million terrabytes and you're using sha1, PKCS#1 suggests a "Label too long" error
+ // be output.
+
+ $emLen = ($emBits + 1) >> 3; // ie. ceil($emBits / 8)
+ $sLen = $this->sLen == false ? $this->hLen : $this->sLen;
+
+ $mHash = $this->hash->hash($m);
+ if ($emLen < $this->hLen + $sLen + 2) {
+ user_error('Encoding error', E_USER_NOTICE);
+ return false;
+ }
+
+ $salt = $this->_random($sLen);
+ $m2 = "\0\0\0\0\0\0\0\0" . $mHash . $salt;
+ $h = $this->hash->hash($m2);
+ $ps = str_repeat(chr(0), $emLen - $sLen - $this->hLen - 2);
+ $db = $ps . chr(1) . $salt;
+ $dbMask = $this->_mgf1($h, $emLen - $this->hLen - 1);
+ $maskedDB = $db ^ $dbMask;
+ $maskedDB[0] = ~chr(0xFF << ($emBits & 7)) & $maskedDB[0];
+ $em = $maskedDB . $h . chr(0xBC);
+
+ return $em;
+ }
+
+ /**
+ * EMSA-PSS-VERIFY
+ *
+ * See {@link http://tools.ietf.org/html/rfc3447#section-9.1.2 RFC3447#section-9.1.2}.
+ *
+ * @access private
+ * @param String $m
+ * @param String $em
+ * @param Integer $emBits
+ * @return String
+ */
+ function _emsa_pss_verify($m, $em, $emBits)
+ {
+ // if $m is larger than two million terrabytes and you're using sha1, PKCS#1 suggests a "Label too long" error
+ // be output.
+
+ $emLen = ($emBits + 1) >> 3; // ie. ceil($emBits / 8);
+ $sLen = $this->sLen == false ? $this->hLen : $this->sLen;
+
+ $mHash = $this->hash->hash($m);
+ if ($emLen < $this->hLen + $sLen + 2) {
+ return false;
+ }
+
+ if ($em[strlen($em) - 1] != chr(0xBC)) {
+ return false;
+ }
+
+ $maskedDB = substr($em, 0, $em - $this->hLen - 1);
+ $h = substr($em, $em - $this->hLen - 1, $this->hLen);
+ $temp = chr(0xFF << ($emBits & 7));
+ if ((~$maskedDB[0] & $temp) != $temp) {
+ return false;
+ }
+ $dbMask = $this->_mgf1($h, $emLen - $this->hLen - 1);
+ $db = $maskedDB ^ $dbMask;
+ $db[0] = ~chr(0xFF << ($emBits & 7)) & $db[0];
+ $temp = $emLen - $this->hLen - $sLen - 2;
+ if (substr($db, 0, $temp) != str_repeat(chr(0), $temp) || ord($db[$temp]) != 1) {
+ return false;
+ }
+ $salt = substr($db, $temp + 1); // should be $sLen long
+ $m2 = "\0\0\0\0\0\0\0\0" . $mHash . $salt;
+ $h2 = $this->hash->hash($m2);
+ return $h == $h2;
+ }
+
+ /**
+ * RSASSA-PSS-SIGN
+ *
+ * See {@link http://tools.ietf.org/html/rfc3447#section-8.1.1 RFC3447#section-8.1.1}.
+ *
+ * @access private
+ * @param String $m
+ * @return String
+ */
+ function _rsassa_pss_sign($m)
+ {
+ // EMSA-PSS encoding
+
+ $em = $this->_emsa_pss_encode($m, 8 * $this->k - 1);
+
+ // RSA signature
+
+ $m = $this->_os2ip($em);
+ $s = $this->_rsasp1($m);
+ $s = $this->_i2osp($s, $this->k);
+
+ // Output the signature S
+
+ return $s;
+ }
+
+ /**
+ * RSASSA-PSS-VERIFY
+ *
+ * See {@link http://tools.ietf.org/html/rfc3447#section-8.1.2 RFC3447#section-8.1.2}.
+ *
+ * @access private
+ * @param String $m
+ * @param String $s
+ * @return String
+ */
+ function _rsassa_pss_verify($m, $s)
+ {
+ // Length checking
+
+ if (strlen($s) != $this->k) {
+ user_error('Invalid signature', E_USER_NOTICE);
+ return false;
+ }
+
+ // RSA verification
+
+ $modBits = 8 * $this->k;
+
+ $s2 = $this->_os2ip($s);
+ $m2 = $this->_rsavp1($s2);
+ if ($m2 === false) {
+ user_error('Invalid signature', E_USER_NOTICE);
+ return false;
+ }
+ $em = $this->_i2osp($m2, $modBits >> 3);
+ if ($em === false) {
+ user_error('Invalid signature', E_USER_NOTICE);
+ return false;
+ }
+
+ // EMSA-PSS verification
+
+ return $this->_emsa_pss_verify($m, $em, $modBits - 1);
+ }
+
+ /**
+ * EMSA-PKCS1-V1_5-ENCODE
+ *
+ * See {@link http://tools.ietf.org/html/rfc3447#section-9.2 RFC3447#section-9.2}.
+ *
+ * @access private
+ * @param String $m
+ * @param Integer $emLen
+ * @return String
+ */
+ function _emsa_pkcs1_v1_5_encode($m, $emLen)
+ {
+ $h = $this->hash->hash($m);
+ if ($h === false) {
+ return false;
+ }
+
+ // see http://tools.ietf.org/html/rfc3447#page-43
+ switch ($this->hashName) {
+ case 'md2':
+ $t = pack('H*', '3020300c06082a864886f70d020205000410');
+ break;
+ case 'md5':
+ $t = pack('H*', '3020300c06082a864886f70d020505000410');
+ break;
+ case 'sha1':
+ $t = pack('H*', '3021300906052b0e03021a05000414');
+ break;
+ case 'sha256':
+ $t = pack('H*', '3031300d060960864801650304020105000420');
+ break;
+ case 'sha384':
+ $t = pack('H*', '3041300d060960864801650304020205000430');
+ break;
+ case 'sha512':
+ $t = pack('H*', '3051300d060960864801650304020305000440');
+ }
+ $t.= $h;
+ $tLen = strlen($t);
+
+ if ($emLen < $tLen + 11) {
+ user_error('Intended encoded message length too short', E_USER_NOTICE);
+ return false;
+ }
+
+ $ps = str_repeat(chr(0xFF), $emLen - $tLen - 3);
+
+ $em = "\0\1$ps\0$t";
+
+ return $em;
+ }
+
+ /**
+ * RSASSA-PKCS1-V1_5-SIGN
+ *
+ * See {@link http://tools.ietf.org/html/rfc3447#section-8.2.1 RFC3447#section-8.2.1}.
+ *
+ * @access private
+ * @param String $m
+ * @return String
+ */
+ function _rsassa_pkcs1_v1_5_sign($m)
+ {
+ // EMSA-PKCS1-v1_5 encoding
+
+ $em = $this->_emsa_pkcs1_v1_5_encode($m, $this->k);
+ if ($em === false) {
+ user_error('RSA modulus too short', E_USER_NOTICE);
+ return false;
+ }
+
+ // RSA signature
+
+ $m = $this->_os2ip($em);
+ $s = $this->_rsasp1($m);
+ $s = $this->_i2osp($s, $this->k);
+
+ // Output the signature S
+
+ return $s;
+ }
+
+ /**
+ * RSASSA-PKCS1-V1_5-VERIFY
+ *
+ * See {@link http://tools.ietf.org/html/rfc3447#section-8.2.2 RFC3447#section-8.2.2}.
+ *
+ * @access private
+ * @param String $m
+ * @return String
+ */
+ function _rsassa_pkcs1_v1_5_verify($m, $s)
+ {
+ // Length checking
+
+ if (strlen($s) != $this->k) {
+ user_error('Invalid signature', E_USER_NOTICE);
+ return false;
+ }
+
+ // RSA verification
+
+ $s = $this->_os2ip($s);
+ $m2 = $this->_rsavp1($s);
+ if ($m2 === false) {
+ user_error('Invalid signature', E_USER_NOTICE);
+ return false;
+ }
+ $em = $this->_i2osp($m2, $this->k);
+ if ($em === false) {
+ user_error('Invalid signature', E_USER_NOTICE);
+ return false;
+ }
+
+ // EMSA-PKCS1-v1_5 encoding
+
+ $em2 = $this->_emsa_pkcs1_v1_5_encode($m, $this->k);
+ if ($em2 === false) {
+ user_error('RSA modulus too short', E_USER_NOTICE);
+ return false;
+ }
+
+ // Compare
+
+ return $em === $em2;
+ }
+
+ /**
+ * Set Encryption Mode
+ *
+ * Valid values include CRYPT_RSA_ENCRYPTION_OAEP and CRYPT_RSA_ENCRYPTION_PKCS1.
+ *
+ * @access public
+ * @param Integer $mode
+ */
+ function setEncryptionMode($mode)
+ {
+ $this->encryptionMode = $mode;
+ }
+
+ /**
+ * Set Signature Mode
+ *
+ * Valid values include CRYPT_RSA_SIGNATURE_PSS and CRYPT_RSA_SIGNATURE_PKCS1
+ *
+ * @access public
+ * @param Integer $mode
+ */
+ function setSignatureMode($mode)
+ {
+ $this->signatureMode = $mode;
+ }
+
+ /**
+ * Encryption
+ *
+ * Both CRYPT_RSA_ENCRYPTION_OAEP and CRYPT_RSA_ENCRYPTION_PKCS1 both place limits on how long $plaintext can be.
+ * If $plaintext exceeds those limits it will be broken up so that it does and the resultant ciphertext's will
+ * be concatenated together.
+ *
+ * @see decrypt()
+ * @access public
+ * @param String $plaintext
+ * @return String
+ */
+ function encrypt($plaintext)
+ {
+ switch ($this->encryptionMode) {
+ case CRYPT_RSA_ENCRYPTION_PKCS1:
+ $length = $this->k - 11;
+ if ($length <= 0) {
+ return false;
+ }
+
+ $plaintext = str_split($plaintext, $length);
+ $ciphertext = '';
+ foreach ($plaintext as $m) {
+ $ciphertext.= $this->_rsaes_pkcs1_v1_5_encrypt($m);
+ }
+ return $ciphertext;
+ //case CRYPT_RSA_ENCRYPTION_OAEP:
+ default:
+ $length = $this->k - 2 * $this->hLen - 2;
+ if ($length <= 0) {
+ return false;
+ }
+
+ $plaintext = str_split($plaintext, $length);
+ $ciphertext = '';
+ foreach ($plaintext as $m) {
+ $ciphertext.= $this->_rsaes_oaep_encrypt($m);
+ }
+ return $ciphertext;
+ }
+ }
+
+ /**
+ * Decryption
+ *
+ * @see encrypt()
+ * @access public
+ * @param String $plaintext
+ * @return String
+ */
+ function decrypt($ciphertext)
+ {
+ if ($this->k <= 0) {
+ return false;
+ }
+
+ $ciphertext = str_split($ciphertext, $this->k);
+ $plaintext = '';
+
+ switch ($this->encryptionMode) {
+ case CRYPT_RSA_ENCRYPTION_PKCS1:
+ $decrypt = '_rsaes_pkcs1_v1_5_decrypt';
+ break;
+ //case CRYPT_RSA_ENCRYPTION_OAEP:
+ default:
+ $decrypt = '_rsaes_oaep_decrypt';
+ }
+
+ foreach ($ciphertext as $c) {
+ $temp = $this->$decrypt($c);
+ if ($temp === false) {
+ return false;
+ }
+ $plaintext.= $temp;
+ }
+
+ return $plaintext;
+ }
+
+ /**
+ * Create a signature
+ *
+ * @see verify()
+ * @access public
+ * @param String $message
+ * @return String
+ */
+ function sign($message)
+ {
+ if (empty($this->modulus) || empty($this->exponent)) {
+ return false;
+ }
+
+ switch ($this->signatureMode) {
+ case CRYPT_RSA_SIGNATURE_PKCS1:
+ return $this->_rsassa_pkcs1_v1_5_sign($message);
+ //case CRYPT_RSA_SIGNATURE_PSS:
+ default:
+ return $this->_rsassa_pss_sign($message);
+ }
+ }
+
+ /**
+ * Verifies a signature
+ *
+ * @see sign()
+ * @access public
+ * @param String $message
+ * @param String $signature
+ * @return Boolean
+ */
+ function verify($message, $signature)
+ {
+ if (empty($this->modulus) || empty($this->exponent)) {
+ return false;
+ }
+
+ switch ($this->signatureMode) {
+ case CRYPT_RSA_SIGNATURE_PKCS1:
+ return $this->_rsassa_pkcs1_v1_5_verify($message, $signature);
+ //case CRYPT_RSA_SIGNATURE_PSS:
+ default:
+ return $this->_rsassa_pss_verify($message, $signature);
+ }
+ }
+}
\ No newline at end of file diff --git a/phpsec/Crypt/Random.php b/phpsec/Crypt/Random.php new file mode 100644 index 000000000..a91c4d3c5 --- /dev/null +++ b/phpsec/Crypt/Random.php @@ -0,0 +1,130 @@ +<?php
+/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
+
+/**
+ * Random Number Generator
+ *
+ * PHP versions 4 and 5
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ * include('Crypt/Random.php');
+ *
+ * echo crypt_random();
+ * ?>
+ * </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_Random
+ * @author Jim Wigginton <terrafrost@php.net>
+ * @copyright MMVII Jim Wigginton
+ * @license http://www.gnu.org/licenses/lgpl.txt
+ * @version $Id: Random.php,v 1.9 2010/04/24 06:40:48 terrafrost Exp $
+ * @link http://phpseclib.sourceforge.net
+ */
+
+/**
+ * Generate a random value.
+ *
+ * On 32-bit machines, the largest distance that can exist between $min and $max is 2**31.
+ * If $min and $max are farther apart than that then the last ($max - range) numbers.
+ *
+ * Depending on how this is being used, it may be worth while to write a replacement. For example,
+ * a PHP-based web app that stores its data in an SQL database can collect more entropy than this function
+ * can.
+ *
+ * @param optional Integer $min
+ * @param optional Integer $max
+ * @return Integer
+ * @access public
+ */
+function crypt_random($min = 0, $max = 0x7FFFFFFF)
+{
+ if ($min == $max) {
+ return $min;
+ }
+
+ // see http://en.wikipedia.org/wiki//dev/random
+ // if open_basedir is enabled file_exists() will ouput an "open_basedir restriction in effect" warning,
+ // so we suppress it.
+ if (@file_exists('/dev/urandom')) {
+ static $fp;
+ if (!$fp) {
+ $fp = fopen('/dev/urandom', 'rb');
+ }
+ extract(unpack('Nrandom', fread($fp, 4)));
+
+ // say $min = 0 and $max = 3. if we didn't do abs() then we could have stuff like this:
+ // -4 % 3 + 0 = -1, even though -1 < $min
+ return abs($random) % ($max - $min) + $min;
+ }
+
+ /* Prior to PHP 4.2.0, mt_srand() had to be called before mt_rand() could be called.
+ Prior to PHP 5.2.6, mt_rand()'s automatic seeding was subpar, as elaborated here:
+
+ http://www.suspekt.org/2008/08/17/mt_srand-and-not-so-random-numbers/
+
+ The seeding routine is pretty much ripped from PHP's own internal GENERATE_SEED() macro:
+
+ http://svn.php.net/viewvc/php/php-src/branches/PHP_5_3_2/ext/standard/php_rand.h?view=markup */
+ if (version_compare(PHP_VERSION, '5.2.5', '<=')) {
+ static $seeded;
+ if (!isset($seeded)) {
+ $seeded = true;
+ mt_srand(fmod(time() * getmypid(), 0x7FFFFFFF) ^ fmod(1000000 * lcg_value(), 0x7FFFFFFF));
+ }
+ }
+
+ static $crypto;
+
+ // The CSPRNG's Yarrow and Fortuna periodically reseed. This function can be reseeded by hitting F5
+ // in the browser and reloading the page.
+
+ if (!isset($crypto)) {
+ $key = $iv = '';
+ for ($i = 0; $i < 8; $i++) {
+ $key.= pack('n', mt_rand(0, 0xFFFF));
+ $iv .= pack('n', mt_rand(0, 0xFFFF));
+ }
+ switch (true) {
+ case class_exists('Crypt_AES'):
+ $crypto = new Crypt_AES(CRYPT_AES_MODE_CTR);
+ break;
+ case class_exists('Crypt_TripleDES'):
+ $crypto = new Crypt_TripleDES(CRYPT_DES_MODE_CTR);
+ break;
+ case class_exists('Crypt_DES'):
+ $crypto = new Crypt_DES(CRYPT_DES_MODE_CTR);
+ break;
+ case class_exists('Crypt_RC4'):
+ $crypto = new Crypt_RC4();
+ break;
+ default:
+ extract(unpack('Nrandom', pack('H*', sha1(mt_rand(0, 0x7FFFFFFF)))));
+ return abs($random) % ($max - $min) + $min;
+ }
+ $crypto->setKey($key);
+ $crypto->setIV($iv);
+ $crypto->enableContinuousBuffer();
+ }
+
+ extract(unpack('Nrandom', $crypto->encrypt("\0\0\0\0")));
+ return abs($random) % ($max - $min) + $min;
+}
+?>
\ No newline at end of file diff --git a/phpsec/Crypt/Rijndael.php b/phpsec/Crypt/Rijndael.php new file mode 100644 index 000000000..f141f3762 --- /dev/null +++ b/phpsec/Crypt/Rijndael.php @@ -0,0 +1,1242 @@ +<?php
+/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
+
+/**
+ * Pure-PHP implementation of Rijndael.
+ *
+ * Does not use mcrypt, even when available, for reasons that are explained below.
+ *
+ * PHP versions 4 and 5
+ *
+ * If {@link Crypt_Rijndael::setBlockLength() setBlockLength()} isn't called, it'll be assumed to be 128 bits. If
+ * {@link Crypt_Rijndael::setKeyLength() setKeyLength()} isn't called, it'll be calculated from
+ * {@link Crypt_Rijndael::setKey() setKey()}. ie. if the key is 128-bits, the key length will be 128-bits. If it's
+ * 136-bits it'll be null-padded to 160-bits and 160 bits will be the key length until
+ * {@link Crypt_Rijndael::setKey() setKey()} is called, again, at which point, it'll be recalculated.
+ *
+ * Not all Rijndael implementations may support 160-bits or 224-bits as the block length / key length. mcrypt, for example,
+ * does not. AES, itself, only supports block lengths of 128 and key lengths of 128, 192, and 256.
+ * {@link http://csrc.nist.gov/archive/aes/rijndael/Rijndael-ammended.pdf#page=10 Rijndael-ammended.pdf#page=10} defines the
+ * algorithm for block lengths of 192 and 256 but not for block lengths / key lengths of 160 and 224. Indeed, 160 and 224
+ * are first defined as valid key / block lengths in
+ * {@link http://csrc.nist.gov/archive/aes/rijndael/Rijndael-ammended.pdf#page=44 Rijndael-ammended.pdf#page=44}:
+ * Extensions: Other block and Cipher Key lengths.
+ *
+ * {@internal The variable names are the same as those in
+ * {@link http://www.csrc.nist.gov/publications/fips/fips197/fips-197.pdf#page=10 fips-197.pdf#page=10}.}}
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ * include('Crypt/Rijndael.php');
+ *
+ * $rijndael = new Crypt_Rijndael();
+ *
+ * $rijndael->setKey('abcdefghijklmnop');
+ *
+ * $size = 10 * 1024;
+ * $plaintext = '';
+ * for ($i = 0; $i < $size; $i++) {
+ * $plaintext.= 'a';
+ * }
+ *
+ * echo $rijndael->decrypt($rijndael->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_Rijndael
+ * @author Jim Wigginton <terrafrost@php.net>
+ * @copyright MMVIII Jim Wigginton
+ * @license http://www.gnu.org/licenses/lgpl.txt
+ * @version $Id: Rijndael.php,v 1.12 2010/02/09 06:10:26 terrafrost Exp $
+ * @link http://phpseclib.sourceforge.net
+ */
+
+/**#@+
+ * @access public
+ * @see Crypt_Rijndael::encrypt()
+ * @see Crypt_Rijndael::decrypt()
+ */
+/**
+ * Encrypt / decrypt using the Counter mode.
+ *
+ * Set to -1 since that's what Crypt/Random.php uses to index the CTR mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Counter_.28CTR.29
+ */
+define('CRYPT_RIJNDAEL_MODE_CTR', -1);
+/**
+ * Encrypt / decrypt using the Electronic Code Book mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29
+ */
+define('CRYPT_RIJNDAEL_MODE_ECB', 1);
+/**
+ * Encrypt / decrypt using the Code Book Chaining mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher-block_chaining_.28CBC.29
+ */
+define('CRYPT_RIJNDAEL_MODE_CBC', 2);
+/**#@-*/
+
+/**#@+
+ * @access private
+ * @see Crypt_Rijndael::Crypt_Rijndael()
+ */
+/**
+ * Toggles the internal implementation
+ */
+define('CRYPT_RIJNDAEL_MODE_INTERNAL', 1);
+/**
+ * Toggles the mcrypt implementation
+ */
+define('CRYPT_RIJNDAEL_MODE_MCRYPT', 2);
+/**#@-*/
+
+/**
+ * Pure-PHP implementation of Rijndael.
+ *
+ * @author Jim Wigginton <terrafrost@php.net>
+ * @version 0.1.0
+ * @access public
+ * @package Crypt_Rijndael
+ */
+class Crypt_Rijndael {
+ /**
+ * The Encryption Mode
+ *
+ * @see Crypt_Rijndael::Crypt_Rijndael()
+ * @var Integer
+ * @access private
+ */
+ var $mode;
+
+ /**
+ * The Key
+ *
+ * @see Crypt_Rijndael::setKey()
+ * @var String
+ * @access private
+ */
+ var $key = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
+
+ /**
+ * The Initialization Vector
+ *
+ * @see Crypt_Rijndael::setIV()
+ * @var String
+ * @access private
+ */
+ var $iv = '';
+
+ /**
+ * A "sliding" Initialization Vector
+ *
+ * @see Crypt_Rijndael::enableContinuousBuffer()
+ * @var String
+ * @access private
+ */
+ var $encryptIV = '';
+
+ /**
+ * A "sliding" Initialization Vector
+ *
+ * @see Crypt_Rijndael::enableContinuousBuffer()
+ * @var String
+ * @access private
+ */
+ var $decryptIV = '';
+
+ /**
+ * Continuous Buffer status
+ *
+ * @see Crypt_Rijndael::enableContinuousBuffer()
+ * @var Boolean
+ * @access private
+ */
+ var $continuousBuffer = false;
+
+ /**
+ * Padding status
+ *
+ * @see Crypt_Rijndael::enablePadding()
+ * @var Boolean
+ * @access private
+ */
+ var $padding = true;
+
+ /**
+ * Does the key schedule need to be (re)calculated?
+ *
+ * @see setKey()
+ * @see setBlockLength()
+ * @see setKeyLength()
+ * @var Boolean
+ * @access private
+ */
+ var $changed = true;
+
+ /**
+ * Has the key length explicitly been set or should it be derived from the key, itself?
+ *
+ * @see setKeyLength()
+ * @var Boolean
+ * @access private
+ */
+ var $explicit_key_length = false;
+
+ /**
+ * The Key Schedule
+ *
+ * @see _setup()
+ * @var Array
+ * @access private
+ */
+ var $w;
+
+ /**
+ * The Inverse Key Schedule
+ *
+ * @see _setup()
+ * @var Array
+ * @access private
+ */
+ var $dw;
+
+ /**
+ * The Block Length
+ *
+ * @see setBlockLength()
+ * @var Integer
+ * @access private
+ * @internal The max value is 32, the min value is 16. All valid values are multiples of 4. Exists in conjunction with
+ * $Nb because we need this value and not $Nb to pad strings appropriately.
+ */
+ var $block_size = 16;
+
+ /**
+ * The Block Length divided by 32
+ *
+ * @see setBlockLength()
+ * @var Integer
+ * @access private
+ * @internal The max value is 256 / 32 = 8, the min value is 128 / 32 = 4. Exists in conjunction with $block_size
+ * because the encryption / decryption / key schedule creation requires this number and not $block_size. We could
+ * derive this from $block_size or vice versa, but that'd mean we'd have to do multiple shift operations, so in lieu
+ * of that, we'll just precompute it once.
+ *
+ */
+ var $Nb = 4;
+
+ /**
+ * The Key Length
+ *
+ * @see setKeyLength()
+ * @var Integer
+ * @access private
+ * @internal The max value is 256 / 8 = 32, the min value is 128 / 8 = 16. Exists in conjunction with $key_size
+ * because the encryption / decryption / key schedule creation requires this number and not $key_size. We could
+ * derive this from $key_size or vice versa, but that'd mean we'd have to do multiple shift operations, so in lieu
+ * of that, we'll just precompute it once.
+ */
+ var $key_size = 16;
+
+ /**
+ * The Key Length divided by 32
+ *
+ * @see setKeyLength()
+ * @var Integer
+ * @access private
+ * @internal The max value is 256 / 32 = 8, the min value is 128 / 32 = 4
+ */
+ var $Nk = 4;
+
+ /**
+ * The Number of Rounds
+ *
+ * @var Integer
+ * @access private
+ * @internal The max value is 14, the min value is 10.
+ */
+ var $Nr;
+
+ /**
+ * Shift offsets
+ *
+ * @var Array
+ * @access private
+ */
+ var $c;
+
+ /**
+ * Precomputed mixColumns table
+ *
+ * @see Crypt_Rijndael()
+ * @var Array
+ * @access private
+ */
+ var $t0;
+
+ /**
+ * Precomputed mixColumns table
+ *
+ * @see Crypt_Rijndael()
+ * @var Array
+ * @access private
+ */
+ var $t1;
+
+ /**
+ * Precomputed mixColumns table
+ *
+ * @see Crypt_Rijndael()
+ * @var Array
+ * @access private
+ */
+ var $t2;
+
+ /**
+ * Precomputed mixColumns table
+ *
+ * @see Crypt_Rijndael()
+ * @var Array
+ * @access private
+ */
+ var $t3;
+
+ /**
+ * Precomputed invMixColumns table
+ *
+ * @see Crypt_Rijndael()
+ * @var Array
+ * @access private
+ */
+ var $dt0;
+
+ /**
+ * Precomputed invMixColumns table
+ *
+ * @see Crypt_Rijndael()
+ * @var Array
+ * @access private
+ */
+ var $dt1;
+
+ /**
+ * Precomputed invMixColumns table
+ *
+ * @see Crypt_Rijndael()
+ * @var Array
+ * @access private
+ */
+ var $dt2;
+
+ /**
+ * Precomputed invMixColumns table
+ *
+ * @see Crypt_Rijndael()
+ * @var Array
+ * @access private
+ */
+ var $dt3;
+
+ /**
+ * Default Constructor.
+ *
+ * Determines whether or not the mcrypt extension should be used. $mode should only, at present, be
+ * CRYPT_RIJNDAEL_MODE_ECB or CRYPT_RIJNDAEL_MODE_CBC. If not explictly set, CRYPT_RIJNDAEL_MODE_CBC will be used.
+ *
+ * @param optional Integer $mode
+ * @return Crypt_Rijndael
+ * @access public
+ */
+ function Crypt_Rijndael($mode = CRYPT_RIJNDAEL_MODE_CBC)
+ {
+ switch ($mode) {
+ case CRYPT_RIJNDAEL_MODE_ECB:
+ case CRYPT_RIJNDAEL_MODE_CBC:
+ case CRYPT_RIJNDAEL_MODE_CTR:
+ $this->mode = $mode;
+ break;
+ default:
+ $this->mode = CRYPT_RIJNDAEL_MODE_CBC;
+ }
+
+ $t3 = &$this->t3;
+ $t2 = &$this->t2;
+ $t1 = &$this->t1;
+ $t0 = &$this->t0;
+
+ $dt3 = &$this->dt3;
+ $dt2 = &$this->dt2;
+ $dt1 = &$this->dt1;
+ $dt0 = &$this->dt0;
+
+ // according to <http://csrc.nist.gov/archive/aes/rijndael/Rijndael-ammended.pdf#page=19> (section 5.2.1),
+ // precomputed tables can be used in the mixColumns phase. in that example, they're assigned t0...t3, so
+ // those are the names we'll use.
+ $t3 = array(
+ 0x6363A5C6, 0x7C7C84F8, 0x777799EE, 0x7B7B8DF6, 0xF2F20DFF, 0x6B6BBDD6, 0x6F6FB1DE, 0xC5C55491,
+ 0x30305060, 0x01010302, 0x6767A9CE, 0x2B2B7D56, 0xFEFE19E7, 0xD7D762B5, 0xABABE64D, 0x76769AEC,
+ 0xCACA458F, 0x82829D1F, 0xC9C94089, 0x7D7D87FA, 0xFAFA15EF, 0x5959EBB2, 0x4747C98E, 0xF0F00BFB,
+ 0xADADEC41, 0xD4D467B3, 0xA2A2FD5F, 0xAFAFEA45, 0x9C9CBF23, 0xA4A4F753, 0x727296E4, 0xC0C05B9B,
+ 0xB7B7C275, 0xFDFD1CE1, 0x9393AE3D, 0x26266A4C, 0x36365A6C, 0x3F3F417E, 0xF7F702F5, 0xCCCC4F83,
+ 0x34345C68, 0xA5A5F451, 0xE5E534D1, 0xF1F108F9, 0x717193E2, 0xD8D873AB, 0x31315362, 0x15153F2A,
+ 0x04040C08, 0xC7C75295, 0x23236546, 0xC3C35E9D, 0x18182830, 0x9696A137, 0x05050F0A, 0x9A9AB52F,
+ 0x0707090E, 0x12123624, 0x80809B1B, 0xE2E23DDF, 0xEBEB26CD, 0x2727694E, 0xB2B2CD7F, 0x75759FEA,
+ 0x09091B12, 0x83839E1D, 0x2C2C7458, 0x1A1A2E34, 0x1B1B2D36, 0x6E6EB2DC, 0x5A5AEEB4, 0xA0A0FB5B,
+ 0x5252F6A4, 0x3B3B4D76, 0xD6D661B7, 0xB3B3CE7D, 0x29297B52, 0xE3E33EDD, 0x2F2F715E, 0x84849713,
+ 0x5353F5A6, 0xD1D168B9, 0x00000000, 0xEDED2CC1, 0x20206040, 0xFCFC1FE3, 0xB1B1C879, 0x5B5BEDB6,
+ 0x6A6ABED4, 0xCBCB468D, 0xBEBED967, 0x39394B72, 0x4A4ADE94, 0x4C4CD498, 0x5858E8B0, 0xCFCF4A85,
+ 0xD0D06BBB, 0xEFEF2AC5, 0xAAAAE54F, 0xFBFB16ED, 0x4343C586, 0x4D4DD79A, 0x33335566, 0x85859411,
+ 0x4545CF8A, 0xF9F910E9, 0x02020604, 0x7F7F81FE, 0x5050F0A0, 0x3C3C4478, 0x9F9FBA25, 0xA8A8E34B,
+ 0x5151F3A2, 0xA3A3FE5D, 0x4040C080, 0x8F8F8A05, 0x9292AD3F, 0x9D9DBC21, 0x38384870, 0xF5F504F1,
+ 0xBCBCDF63, 0xB6B6C177, 0xDADA75AF, 0x21216342, 0x10103020, 0xFFFF1AE5, 0xF3F30EFD, 0xD2D26DBF,
+ 0xCDCD4C81, 0x0C0C1418, 0x13133526, 0xECEC2FC3, 0x5F5FE1BE, 0x9797A235, 0x4444CC88, 0x1717392E,
+ 0xC4C45793, 0xA7A7F255, 0x7E7E82FC, 0x3D3D477A, 0x6464ACC8, 0x5D5DE7BA, 0x19192B32, 0x737395E6,
+ 0x6060A0C0, 0x81819819, 0x4F4FD19E, 0xDCDC7FA3, 0x22226644, 0x2A2A7E54, 0x9090AB3B, 0x8888830B,
+ 0x4646CA8C, 0xEEEE29C7, 0xB8B8D36B, 0x14143C28, 0xDEDE79A7, 0x5E5EE2BC, 0x0B0B1D16, 0xDBDB76AD,
+ 0xE0E03BDB, 0x32325664, 0x3A3A4E74, 0x0A0A1E14, 0x4949DB92, 0x06060A0C, 0x24246C48, 0x5C5CE4B8,
+ 0xC2C25D9F, 0xD3D36EBD, 0xACACEF43, 0x6262A6C4, 0x9191A839, 0x9595A431, 0xE4E437D3, 0x79798BF2,
+ 0xE7E732D5, 0xC8C8438B, 0x3737596E, 0x6D6DB7DA, 0x8D8D8C01, 0xD5D564B1, 0x4E4ED29C, 0xA9A9E049,
+ 0x6C6CB4D8, 0x5656FAAC, 0xF4F407F3, 0xEAEA25CF, 0x6565AFCA, 0x7A7A8EF4, 0xAEAEE947, 0x08081810,
+ 0xBABAD56F, 0x787888F0, 0x25256F4A, 0x2E2E725C, 0x1C1C2438, 0xA6A6F157, 0xB4B4C773, 0xC6C65197,
+ 0xE8E823CB, 0xDDDD7CA1, 0x74749CE8, 0x1F1F213E, 0x4B4BDD96, 0xBDBDDC61, 0x8B8B860D, 0x8A8A850F,
+ 0x707090E0, 0x3E3E427C, 0xB5B5C471, 0x6666AACC, 0x4848D890, 0x03030506, 0xF6F601F7, 0x0E0E121C,
+ 0x6161A3C2, 0x35355F6A, 0x5757F9AE, 0xB9B9D069, 0x86869117, 0xC1C15899, 0x1D1D273A, 0x9E9EB927,
+ 0xE1E138D9, 0xF8F813EB, 0x9898B32B, 0x11113322, 0x6969BBD2, 0xD9D970A9, 0x8E8E8907, 0x9494A733,
+ 0x9B9BB62D, 0x1E1E223C, 0x87879215, 0xE9E920C9, 0xCECE4987, 0x5555FFAA, 0x28287850, 0xDFDF7AA5,
+ 0x8C8C8F03, 0xA1A1F859, 0x89898009, 0x0D0D171A, 0xBFBFDA65, 0xE6E631D7, 0x4242C684, 0x6868B8D0,
+ 0x4141C382, 0x9999B029, 0x2D2D775A, 0x0F0F111E, 0xB0B0CB7B, 0x5454FCA8, 0xBBBBD66D, 0x16163A2C
+ );
+
+ $dt3 = array(
+ 0xF4A75051, 0x4165537E, 0x17A4C31A, 0x275E963A, 0xAB6BCB3B, 0x9D45F11F, 0xFA58ABAC, 0xE303934B,
+ 0x30FA5520, 0x766DF6AD, 0xCC769188, 0x024C25F5, 0xE5D7FC4F, 0x2ACBD7C5, 0x35448026, 0x62A38FB5,
+ 0xB15A49DE, 0xBA1B6725, 0xEA0E9845, 0xFEC0E15D, 0x2F7502C3, 0x4CF01281, 0x4697A38D, 0xD3F9C66B,
+ 0x8F5FE703, 0x929C9515, 0x6D7AEBBF, 0x5259DA95, 0xBE832DD4, 0x7421D358, 0xE0692949, 0xC9C8448E,
+ 0xC2896A75, 0x8E7978F4, 0x583E6B99, 0xB971DD27, 0xE14FB6BE, 0x88AD17F0, 0x20AC66C9, 0xCE3AB47D,
+ 0xDF4A1863, 0x1A3182E5, 0x51336097, 0x537F4562, 0x6477E0B1, 0x6BAE84BB, 0x81A01CFE, 0x082B94F9,
+ 0x48685870, 0x45FD198F, 0xDE6C8794, 0x7BF8B752, 0x73D323AB, 0x4B02E272, 0x1F8F57E3, 0x55AB2A66,
+ 0xEB2807B2, 0xB5C2032F, 0xC57B9A86, 0x3708A5D3, 0x2887F230, 0xBFA5B223, 0x036ABA02, 0x16825CED,
+ 0xCF1C2B8A, 0x79B492A7, 0x07F2F0F3, 0x69E2A14E, 0xDAF4CD65, 0x05BED506, 0x34621FD1, 0xA6FE8AC4,
+ 0x2E539D34, 0xF355A0A2, 0x8AE13205, 0xF6EB75A4, 0x83EC390B, 0x60EFAA40, 0x719F065E, 0x6E1051BD,
+ 0x218AF93E, 0xDD063D96, 0x3E05AEDD, 0xE6BD464D, 0x548DB591, 0xC45D0571, 0x06D46F04, 0x5015FF60,
+ 0x98FB2419, 0xBDE997D6, 0x4043CC89, 0xD99E7767, 0xE842BDB0, 0x898B8807, 0x195B38E7, 0xC8EEDB79,
+ 0x7C0A47A1, 0x420FE97C, 0x841EC9F8, 0x00000000, 0x80868309, 0x2BED4832, 0x1170AC1E, 0x5A724E6C,
+ 0x0EFFFBFD, 0x8538560F, 0xAED51E3D, 0x2D392736, 0x0FD9640A, 0x5CA62168, 0x5B54D19B, 0x362E3A24,
+ 0x0A67B10C, 0x57E70F93, 0xEE96D2B4, 0x9B919E1B, 0xC0C54F80, 0xDC20A261, 0x774B695A, 0x121A161C,
+ 0x93BA0AE2, 0xA02AE5C0, 0x22E0433C, 0x1B171D12, 0x090D0B0E, 0x8BC7ADF2, 0xB6A8B92D, 0x1EA9C814,
+ 0xF1198557, 0x75074CAF, 0x99DDBBEE, 0x7F60FDA3, 0x01269FF7, 0x72F5BC5C, 0x663BC544, 0xFB7E345B,
+ 0x4329768B, 0x23C6DCCB, 0xEDFC68B6, 0xE4F163B8, 0x31DCCAD7, 0x63851042, 0x97224013, 0xC6112084,
+ 0x4A247D85, 0xBB3DF8D2, 0xF93211AE, 0x29A16DC7, 0x9E2F4B1D, 0xB230F3DC, 0x8652EC0D, 0xC1E3D077,
+ 0xB3166C2B, 0x70B999A9, 0x9448FA11, 0xE9642247, 0xFC8CC4A8, 0xF03F1AA0, 0x7D2CD856, 0x3390EF22,
+ 0x494EC787, 0x38D1C1D9, 0xCAA2FE8C, 0xD40B3698, 0xF581CFA6, 0x7ADE28A5, 0xB78E26DA, 0xADBFA43F,
+ 0x3A9DE42C, 0x78920D50, 0x5FCC9B6A, 0x7E466254, 0x8D13C2F6, 0xD8B8E890, 0x39F75E2E, 0xC3AFF582,
+ 0x5D80BE9F, 0xD0937C69, 0xD52DA96F, 0x2512B3CF, 0xAC993BC8, 0x187DA710, 0x9C636EE8, 0x3BBB7BDB,
+ 0x267809CD, 0x5918F46E, 0x9AB701EC, 0x4F9AA883, 0x956E65E6, 0xFFE67EAA, 0xBCCF0821, 0x15E8E6EF,
+ 0xE79BD9BA, 0x6F36CE4A, 0x9F09D4EA, 0xB07CD629, 0xA4B2AF31, 0x3F23312A, 0xA59430C6, 0xA266C035,
+ 0x4EBC3774, 0x82CAA6FC, 0x90D0B0E0, 0xA7D81533, 0x04984AF1, 0xECDAF741, 0xCD500E7F, 0x91F62F17,
+ 0x4DD68D76, 0xEFB04D43, 0xAA4D54CC, 0x9604DFE4, 0xD1B5E39E, 0x6A881B4C, 0x2C1FB8C1, 0x65517F46,
+ 0x5EEA049D, 0x8C355D01, 0x877473FA, 0x0B412EFB, 0x671D5AB3, 0xDBD25292, 0x105633E9, 0xD647136D,
+ 0xD7618C9A, 0xA10C7A37, 0xF8148E59, 0x133C89EB, 0xA927EECE, 0x61C935B7, 0x1CE5EDE1, 0x47B13C7A,
+ 0xD2DF599C, 0xF2733F55, 0x14CE7918, 0xC737BF73, 0xF7CDEA53, 0xFDAA5B5F, 0x3D6F14DF, 0x44DB8678,
+ 0xAFF381CA, 0x68C43EB9, 0x24342C38, 0xA3405FC2, 0x1DC37216, 0xE2250CBC, 0x3C498B28, 0x0D9541FF,
+ 0xA8017139, 0x0CB3DE08, 0xB4E49CD8, 0x56C19064, 0xCB84617B, 0x32B670D5, 0x6C5C7448, 0xB85742D0
+ );
+
+ for ($i = 0; $i < 256; $i++) {
+ $t2[$i << 8] = (($t3[$i] << 8) & 0xFFFFFF00) | (($t3[$i] >> 24) & 0x000000FF);
+ $t1[$i << 16] = (($t3[$i] << 16) & 0xFFFF0000) | (($t3[$i] >> 16) & 0x0000FFFF);
+ $t0[$i << 24] = (($t3[$i] << 24) & 0xFF000000) | (($t3[$i] >> 8) & 0x00FFFFFF);
+
+ $dt2[$i << 8] = (($this->dt3[$i] << 8) & 0xFFFFFF00) | (($dt3[$i] >> 24) & 0x000000FF);
+ $dt1[$i << 16] = (($this->dt3[$i] << 16) & 0xFFFF0000) | (($dt3[$i] >> 16) & 0x0000FFFF);
+ $dt0[$i << 24] = (($this->dt3[$i] << 24) & 0xFF000000) | (($dt3[$i] >> 8) & 0x00FFFFFF);
+ }
+ }
+
+ /**
+ * Sets the key.
+ *
+ * Keys can be of any length. Rijndael, itself, requires the use of a key that's between 128-bits and 256-bits long and
+ * whose length is a multiple of 32. If the key is less than 256-bits and the key length isn't set, we round the length
+ * up to the closest valid key length, padding $key with null bytes. If the key is more than 256-bits, we trim the
+ * excess bits.
+ *
+ * If the key is not explicitly set, it'll be assumed to be all null bytes.
+ *
+ * @access public
+ * @param String $key
+ */
+ function setKey($key)
+ {
+ $this->key = $key;
+ $this->changed = true;
+ }
+
+ /**
+ * Sets the initialization vector. (optional)
+ *
+ * SetIV is not required when CRYPT_RIJNDAEL_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, $this->block_size), $this->block_size, chr(0));;
+ }
+
+ /**
+ * Sets the key length
+ *
+ * Valid key lengths are 128, 160, 192, 224, and 256. If the length is less than 128, it will be rounded up to
+ * 128. If the length is greater then 128 and invalid, it will be rounded down to the closest valid amount.
+ *
+ * @access public
+ * @param Integer $length
+ */
+ function setKeyLength($length)
+ {
+ $length >>= 5;
+ if ($length > 8) {
+ $length = 8;
+ } else if ($length < 4) {
+ $length = 4;
+ }
+ $this->Nk = $length;
+ $this->key_size = $length << 2;
+
+ $this->explicit_key_length = true;
+ $this->changed = true;
+ }
+
+ /**
+ * Sets the block length
+ *
+ * Valid block lengths are 128, 160, 192, 224, and 256. If the length is less than 128, it will be rounded up to
+ * 128. If the length is greater then 128 and invalid, it will be rounded down to the closest valid amount.
+ *
+ * @access public
+ * @param Integer $length
+ */
+ function setBlockLength($length)
+ {
+ $length >>= 5;
+ if ($length > 8) {
+ $length = 8;
+ } else if ($length < 4) {
+ $length = 4;
+ }
+ $this->Nb = $length;
+ $this->block_size = $length << 2;
+ $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_Rijndael::decrypt()
+ * @see Crypt_Rijndael::encrypt()
+ * @access public
+ * @param Integer $length
+ * @param String $iv
+ */
+ function _generate_xor($length, &$iv)
+ {
+ $xor = '';
+ $block_size = $this->block_size;
+ $num_blocks = floor(($length + ($block_size - 1)) / $block_size);
+ for ($i = 0; $i < $num_blocks; $i++) {
+ $xor.= $iv;
+ for ($j = 4; $j <= $block_size; $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.
+ *
+ * $plaintext will be padded with additional bytes such that it's length is a multiple of the block size. Other Rjindael
+ * implementations may or may not pad in the same manner. Other common approaches to padding and the reasons why it's
+ * necessary are discussed in the following
+ * URL:
+ *
+ * {@link http://www.di-mgt.com.au/cryptopad.html http://www.di-mgt.com.au/cryptopad.html}
+ *
+ * An alternative to padding is to, separately, send the length of the file. This is what SSH, in fact, does.
+ * strlen($plaintext) will still need to be a multiple of 8, however, arbitrary values can be added to make it that
+ * length.
+ *
+ * @see Crypt_Rijndael::decrypt()
+ * @access public
+ * @param String $plaintext
+ */
+ function encrypt($plaintext)
+ {
+ $this->_setup();
+ if ($this->mode != CRYPT_RIJNDAEL_MODE_CTR) {
+ $plaintext = $this->_pad($plaintext);
+ }
+
+ $block_size = $this->block_size;
+ $ciphertext = '';
+ switch ($this->mode) {
+ case CRYPT_RIJNDAEL_MODE_ECB:
+ for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
+ $ciphertext.= $this->_encryptBlock(substr($plaintext, $i, $block_size));
+ }
+ break;
+ case CRYPT_RIJNDAEL_MODE_CBC:
+ $xor = $this->encryptIV;
+ for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
+ $block = substr($plaintext, $i, $block_size);
+ $block = $this->_encryptBlock($block ^ $xor);
+ $xor = $block;
+ $ciphertext.= $block;
+ }
+ if ($this->continuousBuffer) {
+ $this->encryptIV = $xor;
+ }
+ break;
+ case CRYPT_RIJNDAEL_MODE_CTR:
+ $xor = $this->encryptIV;
+ for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
+ $block = substr($plaintext, $i, $block_size);
+ $key = $this->_encryptBlock($this->_generate_xor($block_size, $xor));
+ $ciphertext.= $block ^ $key;
+ }
+ if ($this->continuousBuffer) {
+ $this->encryptIV = $xor;
+ }
+ }
+
+ return $ciphertext;
+ }
+
+ /**
+ * Decrypts a message.
+ *
+ * If strlen($ciphertext) is not a multiple of the block size, null bytes will be added to the end of the string until
+ * it is.
+ *
+ * @see Crypt_Rijndael::encrypt()
+ * @access public
+ * @param String $ciphertext
+ */
+ function decrypt($ciphertext)
+ {
+ $this->_setup();
+
+ if ($this->mode != CRYPT_RIJNDAEL_MODE_CTR) {
+ // 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) + $this->block_size - 1) % $this->block_size, chr(0));
+ }
+
+ $block_size = $this->block_size;
+ $plaintext = '';
+ switch ($this->mode) {
+ case CRYPT_RIJNDAEL_MODE_ECB:
+ for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
+ $plaintext.= $this->_decryptBlock(substr($ciphertext, $i, $block_size));
+ }
+ break;
+ case CRYPT_RIJNDAEL_MODE_CBC:
+ $xor = $this->decryptIV;
+ for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
+ $block = substr($ciphertext, $i, $block_size);
+ $plaintext.= $this->_decryptBlock($block) ^ $xor;
+ $xor = $block;
+ }
+ if ($this->continuousBuffer) {
+ $this->decryptIV = $xor;
+ }
+ break;
+ case CRYPT_RIJNDAEL_MODE_CTR:
+ $xor = $this->decryptIV;
+ for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
+ $block = substr($ciphertext, $i, $block_size);
+ $key = $this->_encryptBlock($this->_generate_xor($block_size, $xor));
+ $plaintext.= $block ^ $key;
+ }
+ if ($this->continuousBuffer) {
+ $this->decryptIV = $xor;
+ }
+ }
+
+ return $this->mode != CRYPT_RIJNDAEL_MODE_CTR ? $this->_unpad($plaintext) : $plaintext;
+ }
+
+ /**
+ * Encrypts a block
+ *
+ * @access private
+ * @param String $in
+ * @return String
+ */
+ function _encryptBlock($in)
+ {
+ $state = array();
+ $words = unpack('N*word', $in);
+
+ $w = $this->w;
+ $t0 = $this->t0;
+ $t1 = $this->t1;
+ $t2 = $this->t2;
+ $t3 = $this->t3;
+ $Nb = $this->Nb;
+ $Nr = $this->Nr;
+ $c = $this->c;
+
+ // addRoundKey
+ $i = 0;
+ foreach ($words as $word) {
+ $state[] = $word ^ $w[0][$i++];
+ }
+
+ // fips-197.pdf#page=19, "Figure 5. Pseudo Code for the Cipher", states that this loop has four components -
+ // subBytes, shiftRows, mixColumns, and addRoundKey. fips-197.pdf#page=30, "Implementation Suggestions Regarding
+ // Various Platforms" suggests that performs enhanced implementations are described in Rijndael-ammended.pdf.
+ // Rijndael-ammended.pdf#page=20, "Implementation aspects / 32-bit processor", discusses such an optimization.
+ // Unfortunately, the description given there is not quite correct. Per aes.spec.v316.pdf#page=19 [1],
+ // equation (7.4.7) is supposed to use addition instead of subtraction, so we'll do that here, as well.
+
+ // [1] http://fp.gladman.plus.com/cryptography_technology/rijndael/aes.spec.v316.pdf
+ $temp = array();
+ for ($round = 1; $round < $Nr; $round++) {
+ $i = 0; // $c[0] == 0
+ $j = $c[1];
+ $k = $c[2];
+ $l = $c[3];
+
+ while ($i < $this->Nb) {
+ $temp[$i] = $t0[$state[$i] & 0xFF000000] ^
+ $t1[$state[$j] & 0x00FF0000] ^
+ $t2[$state[$k] & 0x0000FF00] ^
+ $t3[$state[$l] & 0x000000FF] ^
+ $w[$round][$i];
+ $i++;
+ $j = ($j + 1) % $Nb;
+ $k = ($k + 1) % $Nb;
+ $l = ($l + 1) % $Nb;
+ }
+
+ for ($i = 0; $i < $Nb; $i++) {
+ $state[$i] = $temp[$i];
+ }
+ }
+
+ // subWord
+ for ($i = 0; $i < $Nb; $i++) {
+ $state[$i] = $this->_subWord($state[$i]);
+ }
+
+ // shiftRows + addRoundKey
+ $i = 0; // $c[0] == 0
+ $j = $c[1];
+ $k = $c[2];
+ $l = $c[3];
+ while ($i < $this->Nb) {
+ $temp[$i] = ($state[$i] & 0xFF000000) ^
+ ($state[$j] & 0x00FF0000) ^
+ ($state[$k] & 0x0000FF00) ^
+ ($state[$l] & 0x000000FF) ^
+ $w[$Nr][$i];
+ $i++;
+ $j = ($j + 1) % $Nb;
+ $k = ($k + 1) % $Nb;
+ $l = ($l + 1) % $Nb;
+ }
+ $state = $temp;
+
+ array_unshift($state, 'N*');
+
+ return call_user_func_array('pack', $state);
+ }
+
+ /**
+ * Decrypts a block
+ *
+ * @access private
+ * @param String $in
+ * @return String
+ */
+ function _decryptBlock($in)
+ {
+ $state = array();
+ $words = unpack('N*word', $in);
+
+ $num_states = count($state);
+ $dw = $this->dw;
+ $dt0 = $this->dt0;
+ $dt1 = $this->dt1;
+ $dt2 = $this->dt2;
+ $dt3 = $this->dt3;
+ $Nb = $this->Nb;
+ $Nr = $this->Nr;
+ $c = $this->c;
+
+ // addRoundKey
+ $i = 0;
+ foreach ($words as $word) {
+ $state[] = $word ^ $dw[$Nr][$i++];
+ }
+
+ $temp = array();
+ for ($round = $Nr - 1; $round > 0; $round--) {
+ $i = 0; // $c[0] == 0
+ $j = $Nb - $c[1];
+ $k = $Nb - $c[2];
+ $l = $Nb - $c[3];
+
+ while ($i < $Nb) {
+ $temp[$i] = $dt0[$state[$i] & 0xFF000000] ^
+ $dt1[$state[$j] & 0x00FF0000] ^
+ $dt2[$state[$k] & 0x0000FF00] ^
+ $dt3[$state[$l] & 0x000000FF] ^
+ $dw[$round][$i];
+ $i++;
+ $j = ($j + 1) % $Nb;
+ $k = ($k + 1) % $Nb;
+ $l = ($l + 1) % $Nb;
+ }
+
+ for ($i = 0; $i < $Nb; $i++) {
+ $state[$i] = $temp[$i];
+ }
+ }
+
+ // invShiftRows + invSubWord + addRoundKey
+ $i = 0; // $c[0] == 0
+ $j = $Nb - $c[1];
+ $k = $Nb - $c[2];
+ $l = $Nb - $c[3];
+
+ while ($i < $Nb) {
+ $temp[$i] = $dw[0][$i] ^
+ $this->_invSubWord(($state[$i] & 0xFF000000) |
+ ($state[$j] & 0x00FF0000) |
+ ($state[$k] & 0x0000FF00) |
+ ($state[$l] & 0x000000FF));
+ $i++;
+ $j = ($j + 1) % $Nb;
+ $k = ($k + 1) % $Nb;
+ $l = ($l + 1) % $Nb;
+ }
+
+ $state = $temp;
+
+ array_unshift($state, 'N*');
+
+ return call_user_func_array('pack', $state);
+ }
+
+ /**
+ * Setup Rijndael
+ *
+ * Validates all the variables and calculates $Nr - the number of rounds that need to be performed - and $w - the key
+ * key schedule.
+ *
+ * @access private
+ */
+ function _setup()
+ {
+ // Each number in $rcon is equal to the previous number multiplied by two in Rijndael's finite field.
+ // See http://en.wikipedia.org/wiki/Finite_field_arithmetic#Multiplicative_inverse
+ static $rcon = array(0,
+ 0x01000000, 0x02000000, 0x04000000, 0x08000000, 0x10000000,
+ 0x20000000, 0x40000000, 0x80000000, 0x1B000000, 0x36000000,
+ 0x6C000000, 0xD8000000, 0xAB000000, 0x4D000000, 0x9A000000,
+ 0x2F000000, 0x5E000000, 0xBC000000, 0x63000000, 0xC6000000,
+ 0x97000000, 0x35000000, 0x6A000000, 0xD4000000, 0xB3000000,
+ 0x7D000000, 0xFA000000, 0xEF000000, 0xC5000000, 0x91000000
+ );
+
+ if (!$this->changed) {
+ return;
+ }
+
+ if (!$this->explicit_key_length) {
+ // we do >> 2, here, and not >> 5, as we do above, since strlen($this->key) tells us the number of bytes - not bits
+ $length = strlen($this->key) >> 2;
+ if ($length > 8) {
+ $length = 8;
+ } else if ($length < 4) {
+ $length = 4;
+ }
+ $this->Nk = $length;
+ $this->key_size = $length << 2;
+ }
+
+ $this->key = str_pad(substr($this->key, 0, $this->key_size), $this->key_size, chr(0));
+ $this->encryptIV = $this->decryptIV = $this->iv = str_pad(substr($this->iv, 0, $this->block_size), $this->block_size, chr(0));
+
+ // see Rijndael-ammended.pdf#page=44
+ $this->Nr = max($this->Nk, $this->Nb) + 6;
+
+ // shift offsets for Nb = 5, 7 are defined in Rijndael-ammended.pdf#page=44,
+ // "Table 8: Shift offsets in Shiftrow for the alternative block lengths"
+ // shift offsets for Nb = 4, 6, 8 are defined in Rijndael-ammended.pdf#page=14,
+ // "Table 2: Shift offsets for different block lengths"
+ switch ($this->Nb) {
+ case 4:
+ case 5:
+ case 6:
+ $this->c = array(0, 1, 2, 3);
+ break;
+ case 7:
+ $this->c = array(0, 1, 2, 4);
+ break;
+ case 8:
+ $this->c = array(0, 1, 3, 4);
+ }
+
+ $key = $this->key;
+
+ $w = array_values(unpack('N*words', $key));
+
+ $length = $this->Nb * ($this->Nr + 1);
+ for ($i = $this->Nk; $i < $length; $i++) {
+ $temp = $w[$i - 1];
+ if ($i % $this->Nk == 0) {
+ // according to <http://php.net/language.types.integer>, "the size of an integer is platform-dependent".
+ // on a 32-bit machine, it's 32-bits, and on a 64-bit machine, it's 64-bits. on a 32-bit machine,
+ // 0xFFFFFFFF << 8 == 0xFFFFFF00, but on a 64-bit machine, it equals 0xFFFFFFFF00. as such, doing 'and'
+ // with 0xFFFFFFFF (or 0xFFFFFF00) on a 32-bit machine is unnecessary, but on a 64-bit machine, it is.
+ $temp = (($temp << 8) & 0xFFFFFF00) | (($temp >> 24) & 0x000000FF); // rotWord
+ $temp = $this->_subWord($temp) ^ $rcon[$i / $this->Nk];
+ } else if ($this->Nk > 6 && $i % $this->Nk == 4) {
+ $temp = $this->_subWord($temp);
+ }
+ $w[$i] = $w[$i - $this->Nk] ^ $temp;
+ }
+
+ // convert the key schedule from a vector of $Nb * ($Nr + 1) length to a matrix with $Nr + 1 rows and $Nb columns
+ // and generate the inverse key schedule. more specifically,
+ // according to <http://csrc.nist.gov/archive/aes/rijndael/Rijndael-ammended.pdf#page=23> (section 5.3.3),
+ // "The key expansion for the Inverse Cipher is defined as follows:
+ // 1. Apply the Key Expansion.
+ // 2. Apply InvMixColumn to all Round Keys except the first and the last one."
+ // also, see fips-197.pdf#page=27, "5.3.5 Equivalent Inverse Cipher"
+ $temp = array();
+ for ($i = $row = $col = 0; $i < $length; $i++, $col++) {
+ if ($col == $this->Nb) {
+ if ($row == 0) {
+ $this->dw[0] = $this->w[0];
+ } else {
+ // subWord + invMixColumn + invSubWord = invMixColumn
+ $j = 0;
+ while ($j < $this->Nb) {
+ $dw = $this->_subWord($this->w[$row][$j]);
+ $temp[$j] = $this->dt0[$dw & 0xFF000000] ^
+ $this->dt1[$dw & 0x00FF0000] ^
+ $this->dt2[$dw & 0x0000FF00] ^
+ $this->dt3[$dw & 0x000000FF];
+ $j++;
+ }
+ $this->dw[$row] = $temp;
+ }
+
+ $col = 0;
+ $row++;
+ }
+ $this->w[$row][$col] = $w[$i];
+ }
+
+ $this->dw[$row] = $this->w[$row];
+
+ $this->changed = false;
+ }
+
+ /**
+ * Performs S-Box substitutions
+ *
+ * @access private
+ */
+ function _subWord($word)
+ {
+ static $sbox0, $sbox1, $sbox2, $sbox3;
+
+ if (empty($sbox0)) {
+ $sbox0 = array(
+ 0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76,
+ 0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0,
+ 0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15,
+ 0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75,
+ 0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84,
+ 0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF,
+ 0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8,
+ 0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2,
+ 0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73,
+ 0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB,
+ 0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79,
+ 0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08,
+ 0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A,
+ 0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E,
+ 0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF,
+ 0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16
+ );
+
+ $sbox1 = array();
+ $sbox2 = array();
+ $sbox3 = array();
+
+ for ($i = 0; $i < 256; $i++) {
+ $sbox1[$i << 8] = $sbox0[$i] << 8;
+ $sbox2[$i << 16] = $sbox0[$i] << 16;
+ $sbox3[$i << 24] = $sbox0[$i] << 24;
+ }
+ }
+
+ return $sbox0[$word & 0x000000FF] |
+ $sbox1[$word & 0x0000FF00] |
+ $sbox2[$word & 0x00FF0000] |
+ $sbox3[$word & 0xFF000000];
+ }
+
+ /**
+ * Performs inverse S-Box substitutions
+ *
+ * @access private
+ */
+ function _invSubWord($word)
+ {
+ static $sbox0, $sbox1, $sbox2, $sbox3;
+
+ if (empty($sbox0)) {
+ $sbox0 = array(
+ 0x52, 0x09, 0x6A, 0xD5, 0x30, 0x36, 0xA5, 0x38, 0xBF, 0x40, 0xA3, 0x9E, 0x81, 0xF3, 0xD7, 0xFB,
+ 0x7C, 0xE3, 0x39, 0x82, 0x9B, 0x2F, 0xFF, 0x87, 0x34, 0x8E, 0x43, 0x44, 0xC4, 0xDE, 0xE9, 0xCB,
+ 0x54, 0x7B, 0x94, 0x32, 0xA6, 0xC2, 0x23, 0x3D, 0xEE, 0x4C, 0x95, 0x0B, 0x42, 0xFA, 0xC3, 0x4E,
+ 0x08, 0x2E, 0xA1, 0x66, 0x28, 0xD9, 0x24, 0xB2, 0x76, 0x5B, 0xA2, 0x49, 0x6D, 0x8B, 0xD1, 0x25,
+ 0x72, 0xF8, 0xF6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xD4, 0xA4, 0x5C, 0xCC, 0x5D, 0x65, 0xB6, 0x92,
+ 0x6C, 0x70, 0x48, 0x50, 0xFD, 0xED, 0xB9, 0xDA, 0x5E, 0x15, 0x46, 0x57, 0xA7, 0x8D, 0x9D, 0x84,
+ 0x90, 0xD8, 0xAB, 0x00, 0x8C, 0xBC, 0xD3, 0x0A, 0xF7, 0xE4, 0x58, 0x05, 0xB8, 0xB3, 0x45, 0x06,
+ 0xD0, 0x2C, 0x1E, 0x8F, 0xCA, 0x3F, 0x0F, 0x02, 0xC1, 0xAF, 0xBD, 0x03, 0x01, 0x13, 0x8A, 0x6B,
+ 0x3A, 0x91, 0x11, 0x41, 0x4F, 0x67, 0xDC, 0xEA, 0x97, 0xF2, 0xCF, 0xCE, 0xF0, 0xB4, 0xE6, 0x73,
+ 0x96, 0xAC, 0x74, 0x22, 0xE7, 0xAD, 0x35, 0x85, 0xE2, 0xF9, 0x37, 0xE8, 0x1C, 0x75, 0xDF, 0x6E,
+ 0x47, 0xF1, 0x1A, 0x71, 0x1D, 0x29, 0xC5, 0x89, 0x6F, 0xB7, 0x62, 0x0E, 0xAA, 0x18, 0xBE, 0x1B,
+ 0xFC, 0x56, 0x3E, 0x4B, 0xC6, 0xD2, 0x79, 0x20, 0x9A, 0xDB, 0xC0, 0xFE, 0x78, 0xCD, 0x5A, 0xF4,
+ 0x1F, 0xDD, 0xA8, 0x33, 0x88, 0x07, 0xC7, 0x31, 0xB1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xEC, 0x5F,
+ 0x60, 0x51, 0x7F, 0xA9, 0x19, 0xB5, 0x4A, 0x0D, 0x2D, 0xE5, 0x7A, 0x9F, 0x93, 0xC9, 0x9C, 0xEF,
+ 0xA0, 0xE0, 0x3B, 0x4D, 0xAE, 0x2A, 0xF5, 0xB0, 0xC8, 0xEB, 0xBB, 0x3C, 0x83, 0x53, 0x99, 0x61,
+ 0x17, 0x2B, 0x04, 0x7E, 0xBA, 0x77, 0xD6, 0x26, 0xE1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0C, 0x7D
+ );
+
+ $sbox1 = array();
+ $sbox2 = array();
+ $sbox3 = array();
+
+ for ($i = 0; $i < 256; $i++) {
+ $sbox1[$i << 8] = $sbox0[$i] << 8;
+ $sbox2[$i << 16] = $sbox0[$i] << 16;
+ $sbox3[$i << 24] = $sbox0[$i] << 24;
+ }
+ }
+
+ return $sbox0[$word & 0x000000FF] |
+ $sbox1[$word & 0x0000FF00] |
+ $sbox2[$word & 0x00FF0000] |
+ $sbox3[$word & 0xFF000000];
+ }
+
+ /**
+ * Pad "packets".
+ *
+ * Rijndael works by encrypting between sixteen and thirty-two bytes at a time, provided that number is also a multiple
+ * of four. If you ever need to encrypt or decrypt something that isn't of the proper length, it becomes necessary to
+ * pad the input so that it is of the proper length.
+ *
+ * Padding is enabled by default. Sometimes, however, it is undesirable to pad strings. Such is the case in SSH,
+ * 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_Rijndael::disablePadding()
+ * @access public
+ */
+ function enablePadding()
+ {
+ $this->padding = true;
+ }
+
+ /**
+ * Do not pad packets.
+ *
+ * @see Crypt_Rijndael::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.
+ * $block_size - (strlen($text) % $block_size) bytes are added, each of which is equal to
+ * chr($block_size - (strlen($text) % $block_size)
+ *
+ * If padding is disabled and $text is not a multiple of the blocksize, the string will be padded regardless
+ * and padding will, hence forth, be enabled.
+ *
+ * @see Crypt_Rijndael::_unpad()
+ * @access private
+ */
+ function _pad($text)
+ {
+ $length = strlen($text);
+
+ if (!$this->padding) {
+ if ($length % $this->block_size == 0) {
+ return $text;
+ } else {
+ user_error("The plaintext's length ($length) is not a multiple of the block size ({$this->block_size})", E_USER_NOTICE);
+ $this->padding = true;
+ }
+ }
+
+ $pad = $this->block_size - ($length % $this->block_size);
+
+ return str_pad($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_Rijndael::_pad()
+ * @access private
+ */
+ function _unpad($text)
+ {
+ if (!$this->padding) {
+ return $text;
+ }
+
+ $length = ord($text[strlen($text) - 1]);
+
+ if (!$length || $length > $this->block_size) {
+ return false;
+ }
+
+ return substr($text, 0, -$length);
+ }
+
+ /**
+ * Treat consecutive "packets" as if they are a continuous buffer.
+ *
+ * Say you have a 32-byte plaintext $plaintext. Using the default behavior, the two following code snippets
+ * will yield different outputs:
+ *
+ * <code>
+ * echo $rijndael->encrypt(substr($plaintext, 0, 16));
+ * echo $rijndael->encrypt(substr($plaintext, 16, 16));
+ * </code>
+ * <code>
+ * echo $rijndael->encrypt($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>
+ * $rijndael->encrypt(substr($plaintext, 0, 16));
+ * echo $rijndael->decrypt($des->encrypt(substr($plaintext, 16, 16)));
+ * </code>
+ * <code>
+ * echo $rijndael->decrypt($des->encrypt(substr($plaintext, 16, 16)));
+ * </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_Rijndael() 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_Rijndael::disableContinuousBuffer()
+ * @access public
+ */
+ function enableContinuousBuffer()
+ {
+ $this->continuousBuffer = true;
+ }
+
+ /**
+ * Treat consecutive packets as if they are a discontinuous buffer.
+ *
+ * The default behavior.
+ *
+ * @see Crypt_Rijndael::enableContinuousBuffer()
+ * @access public
+ */
+ function disableContinuousBuffer()
+ {
+ $this->continuousBuffer = false;
+ $this->encryptIV = $this->iv;
+ $this->decryptIV = $this->iv;
+ }
+
+ /**
+ * String Shift
+ *
+ * Inspired by array_shift
+ *
+ * @param String $string
+ * @param optional Integer $index
+ * @return String
+ * @access private
+ */
+ function _string_shift(&$string, $index = 1)
+ {
+ $substr = substr($string, 0, $index);
+ $string = substr($string, $index);
+ return $substr;
+ }
+}
+
+// vim: ts=4:sw=4:et:
+// vim6: fdl=1:
\ No newline at end of file diff --git a/phpsec/Crypt/TripleDES.php b/phpsec/Crypt/TripleDES.php new file mode 100644 index 000000000..4d0dbbca0 --- /dev/null +++ b/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 |