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-rw-r--r--plugins/OStatus/extlib/Crypt/AES.php898
1 files changed, 478 insertions, 420 deletions
diff --git a/plugins/OStatus/extlib/Crypt/AES.php b/plugins/OStatus/extlib/Crypt/AES.php
index 4b062c4f2..68ab4db09 100644
--- a/plugins/OStatus/extlib/Crypt/AES.php
+++ b/plugins/OStatus/extlib/Crypt/AES.php
@@ -1,421 +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 1.5 2009/11/23 19:06:06 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 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 parameters
- *
- * @see Crypt_AES::setMCrypt()
- * @var Array
- * @access private
- */
- var $mcrypt = array('', '');
-
- /**
- * 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_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_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();
- $plaintext = $this->_pad($plaintext);
-
- $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, $this->mcrypt[0], $this->mode, $this->mcrypt[1]);
- mcrypt_generic_init($td, $this->key, $this->encryptIV);
-
- $ciphertext = mcrypt_generic($td, $plaintext);
-
- mcrypt_generic_deinit($td);
- mcrypt_module_close($td);
-
- if ($this->continuousBuffer) {
- $this->encryptIV = substr($ciphertext, -16);
- }
-
- 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)
- {
- // 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));
-
- if ( CRYPT_AES_MODE == CRYPT_AES_MODE_MCRYPT ) {
- $this->_mcryptSetup();
-
- $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, $this->mcrypt[0], $this->mode, $this->mcrypt[1]);
- mcrypt_generic_init($td, $this->key, $this->decryptIV);
-
- $plaintext = mdecrypt_generic($td, $ciphertext);
-
- mcrypt_generic_deinit($td);
- mcrypt_module_close($td);
-
- if ($this->continuousBuffer) {
- $this->decryptIV = substr($ciphertext, -16);
- }
-
- return $this->_unpad($plaintext);
- }
-
- return parent::decrypt($ciphertext);
- }
-
- /**
- * 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 = '')
- {
- $this->mcrypt = array($algorithm_directory, $mode_directory);
- }
-
- /**
- * Setup mcrypt
- *
- * Validates all the variables.
- *
- * @access private
- */
- function _mcryptSetup()
- {
- if (!$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));
-
- $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);
-
- // addRoundKey and reindex $state
- $state = array(
- $state['word1'] ^ $this->w[0][0],
- $state['word2'] ^ $this->w[0][1],
- $state['word3'] ^ $this->w[0][2],
- $state['word4'] ^ $this->w[0][3]
- );
-
- // shiftRows + subWord + mixColumns + addRoundKey
- // we could loop unroll this and use if statements to do more rounds as necessary, but, in my tests, that yields
- // only a marginal improvement. since that also, imho, hinders the readability of the code, i've opted not to do it.
- for ($round = 1; $round < $this->Nr; $round++) {
- $state = array(
- $this->t0[$state[0] & 0xFF000000] ^ $this->t1[$state[1] & 0x00FF0000] ^ $this->t2[$state[2] & 0x0000FF00] ^ $this->t3[$state[3] & 0x000000FF] ^ $this->w[$round][0],
- $this->t0[$state[1] & 0xFF000000] ^ $this->t1[$state[2] & 0x00FF0000] ^ $this->t2[$state[3] & 0x0000FF00] ^ $this->t3[$state[0] & 0x000000FF] ^ $this->w[$round][1],
- $this->t0[$state[2] & 0xFF000000] ^ $this->t1[$state[3] & 0x00FF0000] ^ $this->t2[$state[0] & 0x0000FF00] ^ $this->t3[$state[1] & 0x000000FF] ^ $this->w[$round][2],
- $this->t0[$state[3] & 0xFF000000] ^ $this->t1[$state[0] & 0x00FF0000] ^ $this->t2[$state[1] & 0x0000FF00] ^ $this->t3[$state[2] & 0x000000FF] ^ $this->w[$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);
-
- // addRoundKey and reindex $state
- $state = array(
- $state['word1'] ^ $this->dw[$this->Nr][0],
- $state['word2'] ^ $this->dw[$this->Nr][1],
- $state['word3'] ^ $this->dw[$this->Nr][2],
- $state['word4'] ^ $this->dw[$this->Nr][3]
- );
-
-
- // invShiftRows + invSubBytes + invMixColumns + addRoundKey
- for ($round = $this->Nr - 1; $round > 0; $round--) {
- $state = array(
- $this->dt0[$state[0] & 0xFF000000] ^ $this->dt1[$state[3] & 0x00FF0000] ^ $this->dt2[$state[2] & 0x0000FF00] ^ $this->dt3[$state[1] & 0x000000FF] ^ $this->dw[$round][0],
- $this->dt0[$state[1] & 0xFF000000] ^ $this->dt1[$state[0] & 0x00FF0000] ^ $this->dt2[$state[3] & 0x0000FF00] ^ $this->dt3[$state[2] & 0x000000FF] ^ $this->dw[$round][1],
- $this->dt0[$state[2] & 0xFF000000] ^ $this->dt1[$state[1] & 0x00FF0000] ^ $this->dt2[$state[0] & 0x0000FF00] ^ $this->dt3[$state[3] & 0x000000FF] ^ $this->dw[$round][2],
- $this->dt0[$state[3] & 0xFF000000] ^ $this->dt1[$state[2] & 0x00FF0000] ^ $this->dt2[$state[1] & 0x0000FF00] ^ $this->dt3[$state[0] & 0x000000FF] ^ $this->dw[$round][3]
- );
- }
-
- // invShiftRows + invSubWord + addRoundKey
- $state = array(
- $this->_invSubWord(($state[0] & 0xFF000000) ^ ($state[3] & 0x00FF0000) ^ ($state[2] & 0x0000FF00) ^ ($state[1] & 0x000000FF)) ^ $this->dw[0][0],
- $this->_invSubWord(($state[1] & 0xFF000000) ^ ($state[0] & 0x00FF0000) ^ ($state[3] & 0x0000FF00) ^ ($state[2] & 0x000000FF)) ^ $this->dw[0][1],
- $this->_invSubWord(($state[2] & 0xFF000000) ^ ($state[1] & 0x00FF0000) ^ ($state[0] & 0x0000FF00) ^ ($state[3] & 0x000000FF)) ^ $this->dw[0][2],
- $this->_invSubWord(($state[3] & 0xFF000000) ^ ($state[2] & 0x00FF0000) ^ ($state[1] & 0x0000FF00) ^ ($state[0] & 0x000000FF)) ^ $this->dw[0][3]
- );
-
- return pack('N*', $state[0], $state[1], $state[2], $state[3]);
- }
-}
-
-// vim: ts=4:sw=4:et:
+<?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
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-07-08 10:16:08 +0000