<?php
/**
- * Base Class for all Crypt_* cipher classes
+ * Base Class for all \phpseclib\Crypt\* cipher classes
*
- * PHP versions 4 and 5
+ * PHP version 5
*
* Internally for phpseclib developers:
* If you plan to add a new cipher class, please note following rules:
*
- * - The new Crypt_* cipher class should extend Crypt_Base
+ * - The new \phpseclib\Crypt\* cipher class should extend \phpseclib\Crypt\Base
*
* - Following methods are then required to be overridden/overloaded:
*
*
* - All other methods are optional to be overridden/overloaded
*
- * - Look at the source code of the current ciphers how they extend Crypt_Base
+ * - Look at the source code of the current ciphers how they extend \phpseclib\Crypt\Base
* and take one of them as a start up for the new cipher class.
*
* - Please read all the other comments/notes/hints here also for each class var/method
*
- * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
* @category Crypt
- * @package Crypt_Base
+ * @package Base
* @author Jim Wigginton <terrafrost@php.net>
* @author Hans-Juergen Petrich <petrich@tronic-media.com>
* @copyright 2007 Jim Wigginton
* @link http://phpseclib.sourceforge.net
*/
-/**#@+
- * @access public
- * @see Crypt_Base::encrypt()
- * @see Crypt_Base::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_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_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_MODE_CBC', 2);
-/**
- * Encrypt / decrypt using the Cipher Feedback mode.
- *
- * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher_feedback_.28CFB.29
- */
-define('CRYPT_MODE_CFB', 3);
-/**
- * Encrypt / decrypt using the Output Feedback mode.
- *
- * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Output_feedback_.28OFB.29
- */
-define('CRYPT_MODE_OFB', 4);
-/**
- * Encrypt / decrypt using streaming mode.
- *
- */
-define('CRYPT_MODE_STREAM', 5);
-/**#@-*/
-
-/**#@+
- * @access private
- * @see Crypt_Base::Crypt_Base()
- */
-/**
- * Base value for the internal implementation $engine switch
- */
-define('CRYPT_MODE_INTERNAL', 1);
-/**
- * Base value for the mcrypt implementation $engine switch
- */
-define('CRYPT_MODE_MCRYPT', 2);
-/**#@-*/
+namespace phpseclib\Crypt;
/**
- * Base Class for all Crypt_* cipher classes
+ * Base Class for all \phpseclib\Crypt\* cipher classes
*
- * @package Crypt_Base
+ * @package Base
* @author Jim Wigginton <terrafrost@php.net>
* @author Hans-Juergen Petrich <petrich@tronic-media.com>
- * @access public
*/
-class Crypt_Base
+abstract class Base
{
+ /**#@+
+ * @access public
+ * @see \phpseclib\Crypt\Base::encrypt()
+ * @see \phpseclib\Crypt\Base::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
+ */
+ const 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
+ */
+ const 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
+ */
+ const MODE_CBC = 2;
+ /**
+ * Encrypt / decrypt using the Cipher Feedback mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher_feedback_.28CFB.29
+ */
+ const MODE_CFB = 3;
+ /**
+ * Encrypt / decrypt using the Output Feedback mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Output_feedback_.28OFB.29
+ */
+ const MODE_OFB = 4;
+ /**
+ * Encrypt / decrypt using streaming mode.
+ */
+ const MODE_STREAM = 5;
+ /**#@-*/
+
+ /**
+ * Whirlpool available flag
+ *
+ * @see \phpseclib\Crypt\Base::_hashInlineCryptFunction()
+ * @var bool
+ * @access private
+ */
+ static $WHIRLPOOL_AVAILABLE;
+
+ /**#@+
+ * @access private
+ * @see \phpseclib\Crypt\Base::__construct()
+ */
+ /**
+ * Base value for the internal implementation $engine switch
+ */
+ const ENGINE_INTERNAL = 1;
+ /**
+ * Base value for the mcrypt implementation $engine switch
+ */
+ const ENGINE_MCRYPT = 2;
+ /**
+ * Base value for the mcrypt implementation $engine switch
+ */
+ const ENGINE_OPENSSL = 3;
+ /**#@-*/
+
/**
* The Encryption Mode
*
- * @see Crypt_Base::Crypt_Base()
- * @var Integer
+ * @see self::__construct()
+ * @var int
* @access private
*/
var $mode;
/**
* The Block Length of the block cipher
*
- * @var Integer
+ * @var int
* @access private
*/
var $block_size = 16;
/**
* The Key
*
- * @see Crypt_Base::setKey()
- * @var String
+ * @see self::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_Base::setIV()
- * @var String
+ * @see self::setIV()
+ * @var string
* @access private
*/
var $iv;
/**
* A "sliding" Initialization Vector
*
- * @see Crypt_Base::enableContinuousBuffer()
- * @see Crypt_Base::_clearBuffers()
- * @var String
+ * @see self::enableContinuousBuffer()
+ * @see self::_clearBuffers()
+ * @var string
* @access private
*/
var $encryptIV;
/**
* A "sliding" Initialization Vector
*
- * @see Crypt_Base::enableContinuousBuffer()
- * @see Crypt_Base::_clearBuffers()
- * @var String
+ * @see self::enableContinuousBuffer()
+ * @see self::_clearBuffers()
+ * @var string
* @access private
*/
var $decryptIV;
/**
* Continuous Buffer status
*
- * @see Crypt_Base::enableContinuousBuffer()
- * @var Boolean
+ * @see self::enableContinuousBuffer()
+ * @var bool
* @access private
*/
var $continuousBuffer = false;
/**
* Encryption buffer for CTR, OFB and CFB modes
*
- * @see Crypt_Base::encrypt()
- * @see Crypt_Base::_clearBuffers()
- * @var Array
+ * @see self::encrypt()
+ * @see self::_clearBuffers()
+ * @var array
* @access private
*/
var $enbuffer;
/**
* Decryption buffer for CTR, OFB and CFB modes
*
- * @see Crypt_Base::decrypt()
- * @see Crypt_Base::_clearBuffers()
- * @var Array
+ * @see self::decrypt()
+ * @see self::_clearBuffers()
+ * @var array
* @access private
*/
var $debuffer;
* 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_Base::encrypt()
- * @var Resource
+ * @see self::encrypt()
+ * @var resource
* @access private
*/
var $enmcrypt;
* 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_Base::decrypt()
- * @var Resource
+ * @see self::decrypt()
+ * @var resource
* @access private
*/
var $demcrypt;
/**
* Does the enmcrypt resource need to be (re)initialized?
*
- * @see Crypt_Twofish::setKey()
- * @see Crypt_Twofish::setIV()
- * @var Boolean
+ * @see \phpseclib\Crypt\Twofish::setKey()
+ * @see \phpseclib\Crypt\Twofish::setIV()
+ * @var bool
* @access private
*/
var $enchanged = true;
/**
* Does the demcrypt resource need to be (re)initialized?
*
- * @see Crypt_Twofish::setKey()
- * @see Crypt_Twofish::setIV()
- * @var Boolean
+ * @see \phpseclib\Crypt\Twofish::setKey()
+ * @see \phpseclib\Crypt\Twofish::setIV()
+ * @var bool
* @access private
*/
var $dechanged = true;
* use a separate ECB-mode mcrypt resource.
*
* @link http://phpseclib.sourceforge.net/cfb-demo.phps
- * @see Crypt_Base::encrypt()
- * @see Crypt_Base::decrypt()
- * @see Crypt_Base::_setupMcrypt()
- * @var Resource
+ * @see self::encrypt()
+ * @see self::decrypt()
+ * @see self::_setupMcrypt()
+ * @var resource
* @access private
*/
var $ecb;
* Optimizing value while CFB-encrypting
*
* Only relevant if $continuousBuffer enabled
- * and $engine == CRYPT_MODE_MCRYPT
+ * and $engine == self::ENGINE_MCRYPT
*
* It's faster to re-init $enmcrypt if
* $buffer bytes > $cfb_init_len than
* which, typically, depends on the complexity
* on its internaly Key-expanding algorithm.
*
- * @see Crypt_Base::encrypt()
- * @var Integer
+ * @see self::encrypt()
+ * @var int
* @access private
*/
var $cfb_init_len = 600;
/**
* Does internal cipher state need to be (re)initialized?
*
- * @see setKey()
- * @see setIV()
- * @see disableContinuousBuffer()
- * @var Boolean
+ * @see self::setKey()
+ * @see self::setIV()
+ * @see self::disableContinuousBuffer()
+ * @var bool
* @access private
*/
var $changed = true;
/**
* Padding status
*
- * @see Crypt_Base::enablePadding()
- * @var Boolean
+ * @see self::enablePadding()
+ * @var bool
* @access private
*/
var $padding = true;
/**
* Is the mode one that is paddable?
*
- * @see Crypt_Base::Crypt_Base()
- * @var Boolean
+ * @see self::__construct()
+ * @var bool
* @access private
*/
var $paddable = false;
* which will be determined automatically on __construct()
*
* Currently available $engines are:
- * - CRYPT_MODE_MCRYPT (fast, php-extension: mcrypt, extension_loaded('mcrypt') required)
- * - CRYPT_MODE_INTERNAL (slower, pure php-engine, no php-extension required)
- *
- * In the pipeline... maybe. But currently not available:
- * - CRYPT_MODE_OPENSSL (very fast, php-extension: openssl, extension_loaded('openssl') required)
- *
- * If possible, CRYPT_MODE_MCRYPT will be used for each cipher.
- * Otherwise CRYPT_MODE_INTERNAL
- *
- * @see Crypt_Base::encrypt()
- * @see Crypt_Base::decrypt()
- * @var Integer
+ * - self::ENGINE_OPENSSL (very fast, php-extension: openssl, extension_loaded('openssl') required)
+ * - self::ENGINE_MCRYPT (fast, php-extension: mcrypt, extension_loaded('mcrypt') required)
+ * - self::ENGINE_INTERNAL (slower, pure php-engine, no php-extension required)
+ *
+ * @see self::_setEngine()
+ * @see self::encrypt()
+ * @see self::decrypt()
+ * @var int
* @access private
*/
var $engine;
+ /**
+ * Holds the preferred crypt engine
+ *
+ * @see self::_setEngine()
+ * @see self::setPreferredEngine()
+ * @var int
+ * @access private
+ */
+ var $preferredEngine;
+
/**
* The mcrypt specific name of the cipher
*
- * Only used if $engine == CRYPT_MODE_MCRYPT
+ * Only used if $engine == self::ENGINE_MCRYPT
*
* @link http://www.php.net/mcrypt_module_open
* @link http://www.php.net/mcrypt_list_algorithms
- * @see Crypt_Base::_setupMcrypt()
- * @var String
+ * @see self::_setupMcrypt()
+ * @var string
* @access private
*/
var $cipher_name_mcrypt;
/**
- * The default password key_size used by setPassword()
+ * The openssl specific name of the cipher
*
- * @see Crypt_Base::setPassword()
- * @var Integer
+ * Only used if $engine == self::ENGINE_OPENSSL
+ *
+ * @link http://www.php.net/openssl-get-cipher-methods
+ * @var string
* @access private
*/
- var $password_key_size = 32;
+ var $cipher_name_openssl;
/**
- * The default salt used by setPassword()
+ * The openssl specific name of the cipher in ECB mode
+ *
+ * If OpenSSL does not support the mode we're trying to use (CTR)
+ * it can still be emulated with ECB mode.
*
- * @see Crypt_Base::setPassword()
- * @var String
+ * @link http://www.php.net/openssl-get-cipher-methods
+ * @var string
* @access private
*/
- var $password_default_salt = 'phpseclib/salt';
+ var $cipher_name_openssl_ecb;
/**
- * The namespace used by the cipher for its constants.
- *
- * ie: AES.php is using CRYPT_AES_MODE_* for its constants
- * so $const_namespace is AES
- *
- * DES.php is using CRYPT_DES_MODE_* for its constants
- * so $const_namespace is DES... and so on
- *
- * All CRYPT_<$const_namespace>_MODE_* are aliases of
- * the generic CRYPT_MODE_* constants, so both could be used
- * for each cipher.
- *
- * Example:
- * $aes = new Crypt_AES(CRYPT_AES_MODE_CFB); // $aes will operate in cfb mode
- * $aes = new Crypt_AES(CRYPT_MODE_CFB); // identical
+ * The default salt used by setPassword()
*
- * @see Crypt_Base::Crypt_Base()
- * @var String
+ * @see self::setPassword()
+ * @var string
* @access private
*/
- var $const_namespace;
+ var $password_default_salt = 'phpseclib/salt';
/**
* The name of the performance-optimized callback function
*
* Used by encrypt() / decrypt()
- * only if $engine == CRYPT_MODE_INTERNAL
+ * only if $engine == self::ENGINE_INTERNAL
*
- * @see Crypt_Base::encrypt()
- * @see Crypt_Base::decrypt()
- * @see Crypt_Base::_setupInlineCrypt()
- * @see Crypt_Base::$use_inline_crypt
+ * @see self::encrypt()
+ * @see self::decrypt()
+ * @see self::_setupInlineCrypt()
+ * @see self::$use_inline_crypt
* @var Callback
* @access private
*/
/**
* Holds whether performance-optimized $inline_crypt() can/should be used.
*
- * @see Crypt_Base::encrypt()
- * @see Crypt_Base::decrypt()
- * @see Crypt_Base::inline_crypt
+ * @see self::encrypt()
+ * @see self::decrypt()
+ * @see self::inline_crypt
* @var mixed
* @access private
*/
var $use_inline_crypt;
+ /**
+ * If OpenSSL can be used in ECB but not in CTR we can emulate CTR
+ *
+ * @see self::_openssl_ctr_process()
+ * @var bool
+ * @access private
+ */
+ var $openssl_emulate_ctr = false;
+
+ /**
+ * Determines what options are passed to openssl_encrypt/decrypt
+ *
+ * @see self::isValidEngine()
+ * @var mixed
+ * @access private
+ */
+ var $openssl_options;
+
+ /**
+ * Has the key length explicitly been set or should it be derived from the key, itself?
+ *
+ * @see self::setKeyLength()
+ * @var bool
+ * @access private
+ */
+ var $explicit_key_length = false;
+
+ /**
+ * Don't truncate / null pad key
+ *
+ * @see self::_clearBuffers()
+ * @var bool
+ * @access private
+ */
+ var $skip_key_adjustment = false;
+
/**
* Default Constructor.
*
*
* $mode could be:
*
- * - CRYPT_MODE_ECB
- *
- * - CRYPT_MODE_CBC
+ * - self::MODE_ECB
*
- * - CRYPT_MODE_CTR
+ * - self::MODE_CBC
*
- * - CRYPT_MODE_CFB
+ * - self::MODE_CTR
*
- * - CRYPT_MODE_OFB
+ * - self::MODE_CFB
*
- * (or the alias constants of the chosen cipher, for example for AES: CRYPT_AES_MODE_ECB or CRYPT_AES_MODE_CBC ...)
+ * - self::MODE_OFB
*
- * If not explicitly set, CRYPT_MODE_CBC will be used.
+ * If not explicitly set, self::MODE_CBC will be used.
*
- * @param optional Integer $mode
+ * @param int $mode
* @access public
*/
- function Crypt_Base($mode = CRYPT_MODE_CBC)
+ function __construct($mode = self::MODE_CBC)
{
- $const_crypt_mode = 'CRYPT_' . $this->const_namespace . '_MODE';
-
- // Determining the availibility of mcrypt support for the cipher
- if (!defined($const_crypt_mode)) {
- switch (true) {
- case extension_loaded('mcrypt') && in_array($this->cipher_name_mcrypt, mcrypt_list_algorithms()):
- define($const_crypt_mode, CRYPT_MODE_MCRYPT);
- break;
- default:
- define($const_crypt_mode, CRYPT_MODE_INTERNAL);
- }
- }
-
- // Determining which internal $engine should be used.
- // The fastes possible first.
- switch (true) {
- case empty($this->cipher_name_mcrypt): // The cipher module has no mcrypt-engine support at all so we force CRYPT_MODE_INTERNAL
- $this->engine = CRYPT_MODE_INTERNAL;
- break;
- case constant($const_crypt_mode) == CRYPT_MODE_MCRYPT:
- $this->engine = CRYPT_MODE_MCRYPT;
- break;
- default:
- $this->engine = CRYPT_MODE_INTERNAL;
- }
-
// $mode dependent settings
switch ($mode) {
- case CRYPT_MODE_ECB:
+ case self::MODE_ECB:
$this->paddable = true;
- $this->mode = $mode;
+ $this->mode = self::MODE_ECB;
break;
- case CRYPT_MODE_CTR:
- case CRYPT_MODE_CFB:
- case CRYPT_MODE_OFB:
- case CRYPT_MODE_STREAM:
+ case self::MODE_CTR:
+ case self::MODE_CFB:
+ case self::MODE_OFB:
+ case self::MODE_STREAM:
$this->mode = $mode;
break;
- case CRYPT_MODE_CBC:
+ case self::MODE_CBC:
default:
$this->paddable = true;
- $this->mode = CRYPT_MODE_CBC;
+ $this->mode = self::MODE_CBC;
}
+ $this->_setEngine();
+
// Determining whether inline crypting can be used by the cipher
if ($this->use_inline_crypt !== false && function_exists('create_function')) {
$this->use_inline_crypt = true;
/**
* Sets the initialization vector. (optional)
*
- * SetIV is not required when CRYPT_MODE_ECB (or ie for AES: CRYPT_AES_MODE_ECB) is being used. If not explicitly set, it'll be assumed
+ * SetIV is not required when self::MODE_ECB (or ie for AES: \phpseclib\Crypt\AES::MODE_ECB) is being used. If not explicitly set, it'll be assumed
* to be all zero's.
*
- * Note: Could, but not must, extend by the child Crypt_* class
- *
* @access public
- * @param String $iv
+ * @param string $iv
+ * @internal Can be overwritten by a sub class, but does not have to be
*/
function setIV($iv)
{
- if ($this->mode == CRYPT_MODE_ECB) {
+ if ($this->mode == self::MODE_ECB) {
return;
}
$this->changed = true;
}
+ /**
+ * Sets the key length.
+ *
+ * Keys with explicitly set lengths need to be treated accordingly
+ *
+ * @access public
+ * @param int $length
+ */
+ function setKeyLength($length)
+ {
+ $this->explicit_key_length = true;
+ $this->changed = true;
+ $this->_setEngine();
+ }
+
+ /**
+ * Returns the current key length in bits
+ *
+ * @access public
+ * @return int
+ */
+ function getKeyLength()
+ {
+ return $this->key_length << 3;
+ }
+
+ /**
+ * Returns the current block length in bits
+ *
+ * @access public
+ * @return int
+ */
+ function getBlockLength()
+ {
+ return $this->block_size << 3;
+ }
+
/**
* Sets the key.
*
*
* If the key is not explicitly set, it'll be assumed to be all null bytes.
*
- * Note: Could, but not must, extend by the child Crypt_* class
- *
* @access public
- * @param String $key
+ * @param string $key
+ * @internal Could, but not must, extend by the child Crypt_* class
*/
function setKey($key)
{
+ if (!$this->explicit_key_length) {
+ $this->setKeyLength(strlen($key) << 3);
+ $this->explicit_key_length = false;
+ }
+
$this->key = $key;
$this->changed = true;
+ $this->_setEngine();
}
/**
*
* Where $hash (default = sha1) currently supports the following hashes: see: Crypt/Hash.php
*
- * Note: Could, but not must, extend by the child Crypt_* class
- *
* @see Crypt/Hash.php
- * @param String $password
- * @param optional String $method
- * @return Boolean
+ * @param string $password
+ * @param string $method
+ * @return bool
* @access public
+ * @internal Could, but not must, extend by the child Crypt_* class
*/
function setPassword($password, $method = 'pbkdf2')
{
if (isset($func_args[5])) {
$dkLen = $func_args[5];
} else {
- $dkLen = $method == 'pbkdf1' ? 2 * $this->password_key_size : $this->password_key_size;
+ $dkLen = $method == 'pbkdf1' ? 2 * $this->key_length : $this->key_length;
}
switch (true) {
case $method == 'pbkdf1':
- if (!class_exists('Crypt_Hash')) {
- include_once 'Crypt/Hash.php';
- }
- $hashObj = new Crypt_Hash();
+ $hashObj = new Hash();
$hashObj->setHash($hash);
if ($dkLen > $hashObj->getLength()) {
user_error('Derived key too long');
case !function_exists('hash_pbkdf2'):
case !function_exists('hash_algos'):
case !in_array($hash, hash_algos()):
- if (!class_exists('Crypt_Hash')) {
- include_once 'Crypt/Hash.php';
- }
$i = 1;
while (strlen($key) < $dkLen) {
- $hmac = new Crypt_Hash();
+ $hmac = new Hash();
$hmac->setHash($hash);
$hmac->setKey($password);
$f = $u = $hmac->hash($salt . pack('N', $i++));
* strlen($plaintext) will still need to be a multiple of the block size, however, arbitrary values can be added to make it that
* length.
*
- * Note: Could, but not must, extend by the child Crypt_* class
- *
- * @see Crypt_Base::decrypt()
+ * @see self::decrypt()
* @access public
- * @param String $plaintext
- * @return String $cipertext
+ * @param string $plaintext
+ * @return string $ciphertext
+ * @internal Could, but not must, extend by the child Crypt_* class
*/
function encrypt($plaintext)
{
- if ($this->engine == CRYPT_MODE_MCRYPT) {
+ if ($this->paddable) {
+ $plaintext = $this->_pad($plaintext);
+ }
+
+ if ($this->engine === self::ENGINE_OPENSSL) {
+ if ($this->changed) {
+ $this->_clearBuffers();
+ $this->changed = false;
+ }
+ switch ($this->mode) {
+ case self::MODE_STREAM:
+ return openssl_encrypt($plaintext, $this->cipher_name_openssl, $this->key, $this->openssl_options);
+ case self::MODE_ECB:
+ $result = openssl_encrypt($plaintext, $this->cipher_name_openssl, $this->key, $this->openssl_options);
+ return !defined('OPENSSL_RAW_DATA') ? substr($result, 0, -$this->block_size) : $result;
+ case self::MODE_CBC:
+ $result = openssl_encrypt($plaintext, $this->cipher_name_openssl, $this->key, $this->openssl_options, $this->encryptIV);
+ if (!defined('OPENSSL_RAW_DATA')) {
+ $result = substr($result, 0, -$this->block_size);
+ }
+ if ($this->continuousBuffer) {
+ $this->encryptIV = substr($result, -$this->block_size);
+ }
+ return $result;
+ case self::MODE_CTR:
+ return $this->_openssl_ctr_process($plaintext, $this->encryptIV, $this->enbuffer);
+ case self::MODE_CFB:
+ // cfb loosely routines inspired by openssl's:
+ // {@link http://cvs.openssl.org/fileview?f=openssl/crypto/modes/cfb128.c&v=1.3.2.2.2.1}
+ $ciphertext = '';
+ if ($this->continuousBuffer) {
+ $iv = &$this->encryptIV;
+ $pos = &$this->enbuffer['pos'];
+ } else {
+ $iv = $this->encryptIV;
+ $pos = 0;
+ }
+ $len = strlen($plaintext);
+ $i = 0;
+ if ($pos) {
+ $orig_pos = $pos;
+ $max = $this->block_size - $pos;
+ if ($len >= $max) {
+ $i = $max;
+ $len-= $max;
+ $pos = 0;
+ } else {
+ $i = $len;
+ $pos+= $len;
+ $len = 0;
+ }
+ // ie. $i = min($max, $len), $len-= $i, $pos+= $i, $pos%= $blocksize
+ $ciphertext = substr($iv, $orig_pos) ^ $plaintext;
+ $iv = substr_replace($iv, $ciphertext, $orig_pos, $i);
+ $plaintext = substr($plaintext, $i);
+ }
+
+ $overflow = $len % $this->block_size;
+
+ if ($overflow) {
+ $ciphertext.= openssl_encrypt(substr($plaintext, 0, -$overflow) . str_repeat("\0", $this->block_size), $this->cipher_name_openssl, $this->key, $this->openssl_options, $iv);
+ $iv = $this->_string_pop($ciphertext, $this->block_size);
+
+ $size = $len - $overflow;
+ $block = $iv ^ substr($plaintext, -$overflow);
+ $iv = substr_replace($iv, $block, 0, $overflow);
+ $ciphertext.= $block;
+ $pos = $overflow;
+ } elseif ($len) {
+ $ciphertext = openssl_encrypt($plaintext, $this->cipher_name_openssl, $this->key, $this->openssl_options, $iv);
+ $iv = substr($ciphertext, -$this->block_size);
+ }
+
+ return $ciphertext;
+ case self::MODE_OFB:
+ return $this->_openssl_ofb_process($plaintext, $this->encryptIV, $this->enbuffer);
+ }
+ }
+
+ if ($this->engine === self::ENGINE_MCRYPT) {
if ($this->changed) {
$this->_setupMcrypt();
$this->changed = false;
}
if ($this->enchanged) {
- mcrypt_generic_init($this->enmcrypt, $this->key, $this->encryptIV);
+ @mcrypt_generic_init($this->enmcrypt, $this->key, $this->encryptIV);
$this->enchanged = false;
}
// re: {@link http://phpseclib.sourceforge.net/cfb-demo.phps}
// using mcrypt's default handing of CFB the above would output two different things. using phpseclib's
// rewritten CFB implementation the above outputs the same thing twice.
- if ($this->mode == CRYPT_MODE_CFB && $this->continuousBuffer) {
+ if ($this->mode == self::MODE_CFB && $this->continuousBuffer) {
$block_size = $this->block_size;
$iv = &$this->encryptIV;
$pos = &$this->enbuffer['pos'];
if ($len >= $block_size) {
if ($this->enbuffer['enmcrypt_init'] === false || $len > $this->cfb_init_len) {
if ($this->enbuffer['enmcrypt_init'] === true) {
- mcrypt_generic_init($this->enmcrypt, $this->key, $iv);
+ @mcrypt_generic_init($this->enmcrypt, $this->key, $iv);
$this->enbuffer['enmcrypt_init'] = false;
}
- $ciphertext.= mcrypt_generic($this->enmcrypt, substr($plaintext, $i, $len - $len % $block_size));
+ $ciphertext.= @mcrypt_generic($this->enmcrypt, substr($plaintext, $i, $len - $len % $block_size));
$iv = substr($ciphertext, -$block_size);
$len%= $block_size;
} else {
while ($len >= $block_size) {
- $iv = mcrypt_generic($this->ecb, $iv) ^ substr($plaintext, $i, $block_size);
+ $iv = @mcrypt_generic($this->ecb, $iv) ^ substr($plaintext, $i, $block_size);
$ciphertext.= $iv;
$len-= $block_size;
$i+= $block_size;
}
if ($len) {
- $iv = mcrypt_generic($this->ecb, $iv);
+ $iv = @mcrypt_generic($this->ecb, $iv);
$block = $iv ^ substr($plaintext, -$len);
$iv = substr_replace($iv, $block, 0, $len);
$ciphertext.= $block;
return $ciphertext;
}
- if ($this->paddable) {
- $plaintext = $this->_pad($plaintext);
- }
-
- $ciphertext = mcrypt_generic($this->enmcrypt, $plaintext);
+ $ciphertext = @mcrypt_generic($this->enmcrypt, $plaintext);
if (!$this->continuousBuffer) {
- mcrypt_generic_init($this->enmcrypt, $this->key, $this->encryptIV);
+ @mcrypt_generic_init($this->enmcrypt, $this->key, $this->encryptIV);
}
return $ciphertext;
$inline = $this->inline_crypt;
return $inline('encrypt', $this, $plaintext);
}
- if ($this->paddable) {
- $plaintext = $this->_pad($plaintext);
- }
$buffer = &$this->enbuffer;
$block_size = $this->block_size;
$ciphertext = '';
switch ($this->mode) {
- case CRYPT_MODE_ECB:
+ case self::MODE_ECB:
for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
$ciphertext.= $this->_encryptBlock(substr($plaintext, $i, $block_size));
}
break;
- case CRYPT_MODE_CBC:
+ case self::MODE_CBC:
$xor = $this->encryptIV;
for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
$block = substr($plaintext, $i, $block_size);
$this->encryptIV = $xor;
}
break;
- case CRYPT_MODE_CTR:
+ case self::MODE_CTR:
$xor = $this->encryptIV;
- if (strlen($buffer['encrypted'])) {
+ if (strlen($buffer['ciphertext'])) {
for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
$block = substr($plaintext, $i, $block_size);
- if (strlen($block) > strlen($buffer['encrypted'])) {
- $buffer['encrypted'].= $this->_encryptBlock($this->_generateXor($xor, $block_size));
+ if (strlen($block) > strlen($buffer['ciphertext'])) {
+ $buffer['ciphertext'].= $this->_encryptBlock($xor);
}
- $key = $this->_stringShift($buffer['encrypted'], $block_size);
+ $this->_increment_str($xor);
+ $key = $this->_string_shift($buffer['ciphertext'], $block_size);
$ciphertext.= $block ^ $key;
}
} else {
for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
$block = substr($plaintext, $i, $block_size);
- $key = $this->_encryptBlock($this->_generateXor($xor, $block_size));
+ $key = $this->_encryptBlock($xor);
+ $this->_increment_str($xor);
$ciphertext.= $block ^ $key;
}
}
if ($this->continuousBuffer) {
$this->encryptIV = $xor;
if ($start = strlen($plaintext) % $block_size) {
- $buffer['encrypted'] = substr($key, $start) . $buffer['encrypted'];
+ $buffer['ciphertext'] = substr($key, $start) . $buffer['ciphertext'];
}
}
break;
- case CRYPT_MODE_CFB:
+ case self::MODE_CFB:
// cfb loosely routines inspired by openssl's:
// {@link http://cvs.openssl.org/fileview?f=openssl/crypto/modes/cfb128.c&v=1.3.2.2.2.1}
if ($this->continuousBuffer) {
$pos = $len;
}
break;
- case CRYPT_MODE_OFB:
+ case self::MODE_OFB:
$xor = $this->encryptIV;
if (strlen($buffer['xor'])) {
for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
$xor = $this->_encryptBlock($xor);
$buffer['xor'].= $xor;
}
- $key = $this->_stringShift($buffer['xor'], $block_size);
+ $key = $this->_string_shift($buffer['xor'], $block_size);
$ciphertext.= $block ^ $key;
}
} else {
if ($this->continuousBuffer) {
$this->encryptIV = $xor;
if ($start = strlen($plaintext) % $block_size) {
- $buffer['xor'] = substr($key, $start) . $buffer['xor'];
+ $buffer['xor'] = substr($key, $start) . $buffer['xor'];
}
}
break;
- case CRYPT_MODE_STREAM:
+ case self::MODE_STREAM:
$ciphertext = $this->_encryptBlock($plaintext);
break;
}
* 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.
*
- * Note: Could, but not must, extend by the child Crypt_* class
- *
- * @see Crypt_Base::encrypt()
+ * @see self::encrypt()
* @access public
- * @param String $ciphertext
- * @return String $plaintext
+ * @param string $ciphertext
+ * @return string $plaintext
+ * @internal Could, but not must, extend by the child Crypt_* class
*/
function decrypt($ciphertext)
{
- if ($this->engine == CRYPT_MODE_MCRYPT) {
+ if ($this->paddable) {
+ // we pad with chr(0) since that's what mcrypt_generic does. to quote from {@link http://www.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 - strlen($ciphertext) % $this->block_size) % $this->block_size, chr(0));
+ }
+
+ if ($this->engine === self::ENGINE_OPENSSL) {
+ if ($this->changed) {
+ $this->_clearBuffers();
+ $this->changed = false;
+ }
+ switch ($this->mode) {
+ case self::MODE_STREAM:
+ $plaintext = openssl_decrypt($ciphertext, $this->cipher_name_openssl, $this->key, $this->openssl_options);
+ break;
+ case self::MODE_ECB:
+ if (!defined('OPENSSL_RAW_DATA')) {
+ $ciphertext.= openssl_encrypt('', $this->cipher_name_openssl_ecb, $this->key, true);
+ }
+ $plaintext = openssl_decrypt($ciphertext, $this->cipher_name_openssl, $this->key, $this->openssl_options);
+ break;
+ case self::MODE_CBC:
+ if (!defined('OPENSSL_RAW_DATA')) {
+ $padding = str_repeat(chr($this->block_size), $this->block_size) ^ substr($ciphertext, -$this->block_size);
+ $ciphertext.= substr(openssl_encrypt($padding, $this->cipher_name_openssl_ecb, $this->key, true), 0, $this->block_size);
+ $offset = 2 * $this->block_size;
+ } else {
+ $offset = $this->block_size;
+ }
+ $plaintext = openssl_decrypt($ciphertext, $this->cipher_name_openssl, $this->key, $this->openssl_options, $this->decryptIV);
+ if ($this->continuousBuffer) {
+ $this->decryptIV = substr($ciphertext, -$offset, $this->block_size);
+ }
+ break;
+ case self::MODE_CTR:
+ $plaintext = $this->_openssl_ctr_process($ciphertext, $this->decryptIV, $this->debuffer);
+ break;
+ case self::MODE_CFB:
+ // cfb loosely routines inspired by openssl's:
+ // {@link http://cvs.openssl.org/fileview?f=openssl/crypto/modes/cfb128.c&v=1.3.2.2.2.1}
+ $plaintext = '';
+ if ($this->continuousBuffer) {
+ $iv = &$this->decryptIV;
+ $pos = &$this->buffer['pos'];
+ } else {
+ $iv = $this->decryptIV;
+ $pos = 0;
+ }
+ $len = strlen($ciphertext);
+ $i = 0;
+ if ($pos) {
+ $orig_pos = $pos;
+ $max = $this->block_size - $pos;
+ if ($len >= $max) {
+ $i = $max;
+ $len-= $max;
+ $pos = 0;
+ } else {
+ $i = $len;
+ $pos+= $len;
+ $len = 0;
+ }
+ // ie. $i = min($max, $len), $len-= $i, $pos+= $i, $pos%= $this->blocksize
+ $plaintext = substr($iv, $orig_pos) ^ $ciphertext;
+ $iv = substr_replace($iv, substr($ciphertext, 0, $i), $orig_pos, $i);
+ $ciphertext = substr($ciphertext, $i);
+ }
+ $overflow = $len % $this->block_size;
+ if ($overflow) {
+ $plaintext.= openssl_decrypt(substr($ciphertext, 0, -$overflow), $this->cipher_name_openssl, $this->key, $this->openssl_options, $iv);
+ if ($len - $overflow) {
+ $iv = substr($ciphertext, -$overflow - $this->block_size, -$overflow);
+ }
+ $iv = openssl_encrypt(str_repeat("\0", $this->block_size), $this->cipher_name_openssl, $this->key, $this->openssl_options, $iv);
+ $plaintext.= $iv ^ substr($ciphertext, -$overflow);
+ $iv = substr_replace($iv, substr($ciphertext, -$overflow), 0, $overflow);
+ $pos = $overflow;
+ } elseif ($len) {
+ $plaintext.= openssl_decrypt($ciphertext, $this->cipher_name_openssl, $this->key, $this->openssl_options, $iv);
+ $iv = substr($ciphertext, -$this->block_size);
+ }
+ break;
+ case self::MODE_OFB:
+ $plaintext = $this->_openssl_ofb_process($ciphertext, $this->decryptIV, $this->debuffer);
+ }
+
+ return $this->paddable ? $this->_unpad($plaintext) : $plaintext;
+ }
+
+ if ($this->engine === self::ENGINE_MCRYPT) {
$block_size = $this->block_size;
if ($this->changed) {
$this->_setupMcrypt();
$this->changed = false;
}
if ($this->dechanged) {
- mcrypt_generic_init($this->demcrypt, $this->key, $this->decryptIV);
+ @mcrypt_generic_init($this->demcrypt, $this->key, $this->decryptIV);
$this->dechanged = false;
}
- if ($this->mode == CRYPT_MODE_CFB && $this->continuousBuffer) {
+ if ($this->mode == self::MODE_CFB && $this->continuousBuffer) {
$iv = &$this->decryptIV;
$pos = &$this->debuffer['pos'];
$len = strlen($ciphertext);
}
if ($len >= $block_size) {
$cb = substr($ciphertext, $i, $len - $len % $block_size);
- $plaintext.= mcrypt_generic($this->ecb, $iv . $cb) ^ $cb;
+ $plaintext.= @mcrypt_generic($this->ecb, $iv . $cb) ^ $cb;
$iv = substr($cb, -$block_size);
$len%= $block_size;
}
if ($len) {
- $iv = mcrypt_generic($this->ecb, $iv);
+ $iv = @mcrypt_generic($this->ecb, $iv);
$plaintext.= $iv ^ substr($ciphertext, -$len);
$iv = substr_replace($iv, substr($ciphertext, -$len), 0, $len);
$pos = $len;
return $plaintext;
}
- if ($this->paddable) {
- // we pad with chr(0) since that's what mcrypt_generic does. to quote from {@link http://www.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($ciphertext) + ($block_size - strlen($ciphertext) % $block_size) % $block_size, chr(0));
- }
-
- $plaintext = mdecrypt_generic($this->demcrypt, $ciphertext);
+ $plaintext = @mdecrypt_generic($this->demcrypt, $ciphertext);
if (!$this->continuousBuffer) {
- mcrypt_generic_init($this->demcrypt, $this->key, $this->decryptIV);
+ @mcrypt_generic_init($this->demcrypt, $this->key, $this->decryptIV);
}
return $this->paddable ? $this->_unpad($plaintext) : $plaintext;
}
$block_size = $this->block_size;
- if ($this->paddable) {
- // we pad with chr(0) since that's what mcrypt_generic does [...]
- $ciphertext = str_pad($ciphertext, strlen($ciphertext) + ($block_size - strlen($ciphertext) % $block_size) % $block_size, chr(0));
- }
$buffer = &$this->debuffer;
$plaintext = '';
switch ($this->mode) {
- case CRYPT_MODE_ECB:
+ case self::MODE_ECB:
for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
$plaintext.= $this->_decryptBlock(substr($ciphertext, $i, $block_size));
}
break;
- case CRYPT_MODE_CBC:
+ case self::MODE_CBC:
$xor = $this->decryptIV;
for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
$block = substr($ciphertext, $i, $block_size);
$this->decryptIV = $xor;
}
break;
- case CRYPT_MODE_CTR:
+ case self::MODE_CTR:
$xor = $this->decryptIV;
if (strlen($buffer['ciphertext'])) {
for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
$block = substr($ciphertext, $i, $block_size);
if (strlen($block) > strlen($buffer['ciphertext'])) {
- $buffer['ciphertext'].= $this->_encryptBlock($this->_generateXor($xor, $block_size));
+ $buffer['ciphertext'].= $this->_encryptBlock($xor);
+ $this->_increment_str($xor);
}
- $key = $this->_stringShift($buffer['ciphertext'], $block_size);
+ $key = $this->_string_shift($buffer['ciphertext'], $block_size);
$plaintext.= $block ^ $key;
}
} else {
for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
$block = substr($ciphertext, $i, $block_size);
- $key = $this->_encryptBlock($this->_generateXor($xor, $block_size));
+ $key = $this->_encryptBlock($xor);
+ $this->_increment_str($xor);
$plaintext.= $block ^ $key;
}
}
}
}
break;
- case CRYPT_MODE_CFB:
+ case self::MODE_CFB:
if ($this->continuousBuffer) {
$iv = &$this->decryptIV;
$pos = &$buffer['pos'];
$pos = $len;
}
break;
- case CRYPT_MODE_OFB:
+ case self::MODE_OFB:
$xor = $this->decryptIV;
if (strlen($buffer['xor'])) {
for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
$xor = $this->_encryptBlock($xor);
$buffer['xor'].= $xor;
}
- $key = $this->_stringShift($buffer['xor'], $block_size);
+ $key = $this->_string_shift($buffer['xor'], $block_size);
$plaintext.= $block ^ $key;
}
} else {
if ($this->continuousBuffer) {
$this->decryptIV = $xor;
if ($start = strlen($ciphertext) % $block_size) {
- $buffer['xor'] = substr($key, $start) . $buffer['xor'];
+ $buffer['xor'] = substr($key, $start) . $buffer['xor'];
}
}
break;
- case CRYPT_MODE_STREAM:
+ case self::MODE_STREAM:
$plaintext = $this->_decryptBlock($ciphertext);
break;
}
return $this->paddable ? $this->_unpad($plaintext) : $plaintext;
}
+ /**
+ * OpenSSL CTR Processor
+ *
+ * PHP's OpenSSL bindings do not operate in continuous mode so we'll wrap around it. Since the keystream
+ * for CTR is the same for both encrypting and decrypting this function is re-used by both Base::encrypt()
+ * and Base::decrypt(). Also, OpenSSL doesn't implement CTR for all of it's symmetric ciphers so this
+ * function will emulate CTR with ECB when necessary.
+ *
+ * @see self::encrypt()
+ * @see self::decrypt()
+ * @param string $plaintext
+ * @param string $encryptIV
+ * @param array $buffer
+ * @return string
+ * @access private
+ */
+ function _openssl_ctr_process($plaintext, &$encryptIV, &$buffer)
+ {
+ $ciphertext = '';
+
+ $block_size = $this->block_size;
+ $key = $this->key;
+
+ if ($this->openssl_emulate_ctr) {
+ $xor = $encryptIV;
+ if (strlen($buffer['ciphertext'])) {
+ for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
+ $block = substr($plaintext, $i, $block_size);
+ if (strlen($block) > strlen($buffer['ciphertext'])) {
+ $result = openssl_encrypt($xor, $this->cipher_name_openssl_ecb, $key, $this->openssl_options);
+ $result = !defined('OPENSSL_RAW_DATA') ? substr($result, 0, -$this->block_size) : $result;
+ $buffer['ciphertext'].= $result;
+ }
+ $this->_increment_str($xor);
+ $otp = $this->_string_shift($buffer['ciphertext'], $block_size);
+ $ciphertext.= $block ^ $otp;
+ }
+ } else {
+ for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
+ $block = substr($plaintext, $i, $block_size);
+ $otp = openssl_encrypt($xor, $this->cipher_name_openssl_ecb, $key, $this->openssl_options);
+ $otp = !defined('OPENSSL_RAW_DATA') ? substr($otp, 0, -$this->block_size) : $otp;
+ $this->_increment_str($xor);
+ $ciphertext.= $block ^ $otp;
+ }
+ }
+ if ($this->continuousBuffer) {
+ $encryptIV = $xor;
+ if ($start = strlen($plaintext) % $block_size) {
+ $buffer['ciphertext'] = substr($key, $start) . $buffer['ciphertext'];
+ }
+ }
+
+ return $ciphertext;
+ }
+
+ if (strlen($buffer['ciphertext'])) {
+ $ciphertext = $plaintext ^ $this->_string_shift($buffer['ciphertext'], strlen($plaintext));
+ $plaintext = substr($plaintext, strlen($ciphertext));
+
+ if (!strlen($plaintext)) {
+ return $ciphertext;
+ }
+ }
+
+ $overflow = strlen($plaintext) % $block_size;
+ if ($overflow) {
+ $plaintext2 = $this->_string_pop($plaintext, $overflow); // ie. trim $plaintext to a multiple of $block_size and put rest of $plaintext in $plaintext2
+ $encrypted = openssl_encrypt($plaintext . str_repeat("\0", $block_size), $this->cipher_name_openssl, $key, $this->openssl_options, $encryptIV);
+ $temp = $this->_string_pop($encrypted, $block_size);
+ $ciphertext.= $encrypted . ($plaintext2 ^ $temp);
+ if ($this->continuousBuffer) {
+ $buffer['ciphertext'] = substr($temp, $overflow);
+ $encryptIV = $temp;
+ }
+ } elseif (!strlen($buffer['ciphertext'])) {
+ $ciphertext.= openssl_encrypt($plaintext . str_repeat("\0", $block_size), $this->cipher_name_openssl, $key, $this->openssl_options, $encryptIV);
+ $temp = $this->_string_pop($ciphertext, $block_size);
+ if ($this->continuousBuffer) {
+ $encryptIV = $temp;
+ }
+ }
+ if ($this->continuousBuffer) {
+ if (!defined('OPENSSL_RAW_DATA')) {
+ $encryptIV.= openssl_encrypt('', $this->cipher_name_openssl_ecb, $key, $this->openssl_options);
+ }
+ $encryptIV = openssl_decrypt($encryptIV, $this->cipher_name_openssl_ecb, $key, $this->openssl_options);
+ if ($overflow) {
+ $this->_increment_str($encryptIV);
+ }
+ }
+
+ return $ciphertext;
+ }
+
+ /**
+ * OpenSSL OFB Processor
+ *
+ * PHP's OpenSSL bindings do not operate in continuous mode so we'll wrap around it. Since the keystream
+ * for OFB is the same for both encrypting and decrypting this function is re-used by both Base::encrypt()
+ * and Base::decrypt().
+ *
+ * @see self::encrypt()
+ * @see self::decrypt()
+ * @param string $plaintext
+ * @param string $encryptIV
+ * @param array $buffer
+ * @return string
+ * @access private
+ */
+ function _openssl_ofb_process($plaintext, &$encryptIV, &$buffer)
+ {
+ if (strlen($buffer['xor'])) {
+ $ciphertext = $plaintext ^ $buffer['xor'];
+ $buffer['xor'] = substr($buffer['xor'], strlen($ciphertext));
+ $plaintext = substr($plaintext, strlen($ciphertext));
+ } else {
+ $ciphertext = '';
+ }
+
+ $block_size = $this->block_size;
+
+ $len = strlen($plaintext);
+ $key = $this->key;
+ $overflow = $len % $block_size;
+
+ if (strlen($plaintext)) {
+ if ($overflow) {
+ $ciphertext.= openssl_encrypt(substr($plaintext, 0, -$overflow) . str_repeat("\0", $block_size), $this->cipher_name_openssl, $key, $this->openssl_options, $encryptIV);
+ $xor = $this->_string_pop($ciphertext, $block_size);
+ if ($this->continuousBuffer) {
+ $encryptIV = $xor;
+ }
+ $ciphertext.= $this->_string_shift($xor, $overflow) ^ substr($plaintext, -$overflow);
+ if ($this->continuousBuffer) {
+ $buffer['xor'] = $xor;
+ }
+ } else {
+ $ciphertext = openssl_encrypt($plaintext, $this->cipher_name_openssl, $key, $this->openssl_options, $encryptIV);
+ if ($this->continuousBuffer) {
+ $encryptIV = substr($ciphertext, -$block_size) ^ substr($plaintext, -$block_size);
+ }
+ }
+ }
+
+ return $ciphertext;
+ }
+
+ /**
+ * phpseclib <-> OpenSSL Mode Mapper
+ *
+ * May need to be overwritten by classes extending this one in some cases
+ *
+ * @return int
+ * @access private
+ */
+ function _openssl_translate_mode()
+ {
+ switch ($this->mode) {
+ case self::MODE_ECB:
+ return 'ecb';
+ case self::MODE_CBC:
+ return 'cbc';
+ case self::MODE_CTR:
+ return 'ctr';
+ case self::MODE_CFB:
+ return 'cfb';
+ case self::MODE_OFB:
+ return 'ofb';
+ }
+ }
+
/**
* Pad "packets".
*
* away characters that shouldn't be stripped away. (SSH knows how many bytes are added because the length is
* transmitted separately)
*
- * @see Crypt_Base::disablePadding()
+ * @see self::disablePadding()
* @access public
*/
function enablePadding()
/**
* Do not pad packets.
*
- * @see Crypt_Base::enablePadding()
+ * @see self::enablePadding()
* @access public
*/
function disablePadding()
* 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_*() object changes after each
+ * Put another way, when the continuous buffer is enabled, the state of the \phpseclib\Crypt\*() 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.
*
- * Note: Could, but not must, extend by the child Crypt_* class
- *
- * @see Crypt_Base::disableContinuousBuffer()
+ * @see self::disableContinuousBuffer()
* @access public
+ * @internal Could, but not must, extend by the child Crypt_* class
*/
function enableContinuousBuffer()
{
- if ($this->mode == CRYPT_MODE_ECB) {
+ if ($this->mode == self::MODE_ECB) {
return;
}
$this->continuousBuffer = true;
+
+ $this->_setEngine();
}
/**
*
* The default behavior.
*
- * Note: Could, but not must, extend by the child Crypt_* class
- *
- * @see Crypt_Base::enableContinuousBuffer()
+ * @see self::enableContinuousBuffer()
* @access public
+ * @internal Could, but not must, extend by the child Crypt_* class
*/
function disableContinuousBuffer()
{
- if ($this->mode == CRYPT_MODE_ECB) {
+ if ($this->mode == self::MODE_ECB) {
return;
}
if (!$this->continuousBuffer) {
$this->continuousBuffer = false;
$this->changed = true;
+
+ $this->_setEngine();
}
/**
- * Encrypts a block
+ * Test for engine validity
*
- * Note: Must extend by the child Crypt_* class
+ * @see self::__construct()
+ * @param int $engine
+ * @access public
+ * @return bool
+ */
+ function isValidEngine($engine)
+ {
+ switch ($engine) {
+ case self::ENGINE_OPENSSL:
+ if ($this->mode == self::MODE_STREAM && $this->continuousBuffer) {
+ return false;
+ }
+ $this->openssl_emulate_ctr = false;
+ $result = $this->cipher_name_openssl &&
+ extension_loaded('openssl') &&
+ // PHP 5.3.0 - 5.3.2 did not let you set IV's
+ version_compare(PHP_VERSION, '5.3.3', '>=');
+ if (!$result) {
+ return false;
+ }
+
+ // prior to PHP 5.4.0 OPENSSL_RAW_DATA and OPENSSL_ZERO_PADDING were not defined. instead of expecting an integer
+ // $options openssl_encrypt expected a boolean $raw_data.
+ if (!defined('OPENSSL_RAW_DATA')) {
+ $this->openssl_options = true;
+ } else {
+ $this->openssl_options = OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING;
+ }
+
+ $methods = openssl_get_cipher_methods();
+ if (in_array($this->cipher_name_openssl, $methods)) {
+ return true;
+ }
+ // not all of openssl's symmetric cipher's support ctr. for those
+ // that don't we'll emulate it
+ switch ($this->mode) {
+ case self::MODE_CTR:
+ if (in_array($this->cipher_name_openssl_ecb, $methods)) {
+ $this->openssl_emulate_ctr = true;
+ return true;
+ }
+ }
+ return false;
+ case self::ENGINE_MCRYPT:
+ return $this->cipher_name_mcrypt &&
+ extension_loaded('mcrypt') &&
+ in_array($this->cipher_name_mcrypt, @mcrypt_list_algorithms());
+ case self::ENGINE_INTERNAL:
+ return true;
+ }
+
+ return false;
+ }
+
+ /**
+ * Sets the preferred crypt engine
*
- * @access private
- * @param String $in
- * @return String
+ * Currently, $engine could be:
+ *
+ * - \phpseclib\Crypt\Base::ENGINE_OPENSSL [very fast]
+ *
+ * - \phpseclib\Crypt\Base::ENGINE_MCRYPT [fast]
+ *
+ * - \phpseclib\Crypt\Base::ENGINE_INTERNAL [slow]
+ *
+ * If the preferred crypt engine is not available the fastest available one will be used
+ *
+ * @see self::__construct()
+ * @param int $engine
+ * @access public
*/
- function _encryptBlock($in)
+ function setPreferredEngine($engine)
{
- user_error((version_compare(PHP_VERSION, '5.0.0', '>=') ? __METHOD__ : __FUNCTION__) . '() must extend by class ' . get_class($this), E_USER_ERROR);
+ switch ($engine) {
+ //case self::ENGINE_OPENSSL;
+ case self::ENGINE_MCRYPT:
+ case self::ENGINE_INTERNAL:
+ $this->preferredEngine = $engine;
+ break;
+ default:
+ $this->preferredEngine = self::ENGINE_OPENSSL;
+ }
+
+ $this->_setEngine();
}
/**
- * Decrypts a block
+ * Returns the engine currently being utilized
*
- * Note: Must extend by the child Crypt_* class
+ * @see self::_setEngine()
+ * @access public
+ */
+ function getEngine()
+ {
+ return $this->engine;
+ }
+
+ /**
+ * Sets the engine as appropriate
*
+ * @see self::__construct()
* @access private
- * @param String $in
- * @return String
*/
- function _decryptBlock($in)
+ function _setEngine()
{
- user_error((version_compare(PHP_VERSION, '5.0.0', '>=') ? __METHOD__ : __FUNCTION__) . '() must extend by class ' . get_class($this), E_USER_ERROR);
+ $this->engine = null;
+
+ $candidateEngines = array(
+ $this->preferredEngine,
+ self::ENGINE_OPENSSL,
+ self::ENGINE_MCRYPT
+ );
+ foreach ($candidateEngines as $engine) {
+ if ($this->isValidEngine($engine)) {
+ $this->engine = $engine;
+ break;
+ }
+ }
+ if (!$this->engine) {
+ $this->engine = self::ENGINE_INTERNAL;
+ }
+
+ if ($this->engine != self::ENGINE_MCRYPT && $this->enmcrypt) {
+ // Closing the current mcrypt resource(s). _mcryptSetup() will, if needed,
+ // (re)open them with the module named in $this->cipher_name_mcrypt
+ @mcrypt_module_close($this->enmcrypt);
+ @mcrypt_module_close($this->demcrypt);
+ $this->enmcrypt = null;
+ $this->demcrypt = null;
+
+ if ($this->ecb) {
+ @mcrypt_module_close($this->ecb);
+ $this->ecb = null;
+ }
+ }
+
+ $this->changed = true;
}
+ /**
+ * Encrypts a block
+ *
+ * Note: Must be extended by the child \phpseclib\Crypt\* class
+ *
+ * @access private
+ * @param string $in
+ * @return string
+ */
+ abstract function _encryptBlock($in);
+
+ /**
+ * Decrypts a block
+ *
+ * Note: Must be extended by the child \phpseclib\Crypt\* class
+ *
+ * @access private
+ * @param string $in
+ * @return string
+ */
+ abstract function _decryptBlock($in);
+
/**
* Setup the key (expansion)
*
- * Only used if $engine == CRYPT_MODE_INTERNAL
+ * Only used if $engine == self::ENGINE_INTERNAL
*
- * Note: Must extend by the child Crypt_* class
+ * Note: Must extend by the child \phpseclib\Crypt\* class
*
- * @see Crypt_Base::_setup()
+ * @see self::_setup()
* @access private
*/
- function _setupKey()
- {
- user_error((version_compare(PHP_VERSION, '5.0.0', '>=') ? __METHOD__ : __FUNCTION__) . '() must extend by class ' . get_class($this), E_USER_ERROR);
- }
+ abstract function _setupKey();
/**
- * Setup the CRYPT_MODE_INTERNAL $engine
+ * Setup the self::ENGINE_INTERNAL $engine
*
* (re)init, if necessary, the internal cipher $engine and flush all $buffers
- * Used (only) if $engine == CRYPT_MODE_INTERNAL
+ * Used (only) if $engine == self::ENGINE_INTERNAL
*
* _setup() will be called each time if $changed === true
* typically this happens when using one or more of following public methods:
*
* - First run of encrypt() / decrypt() with no init-settings
*
- * Internally: _setup() is called always before(!) en/decryption.
- *
- * Note: Could, but not must, extend by the child Crypt_* class
- *
- * @see setKey()
- * @see setIV()
- * @see disableContinuousBuffer()
+ * @see self::setKey()
+ * @see self::setIV()
+ * @see self::disableContinuousBuffer()
* @access private
+ * @internal _setup() is always called before en/decryption.
+ * @internal Could, but not must, extend by the child Crypt_* class
*/
function _setup()
{
}
/**
- * Setup the CRYPT_MODE_MCRYPT $engine
+ * Setup the self::ENGINE_MCRYPT $engine
*
* (re)init, if necessary, the (ext)mcrypt resources and flush all $buffers
- * Used (only) if $engine = CRYPT_MODE_MCRYPT
+ * Used (only) if $engine = self::ENGINE_MCRYPT
*
* _setupMcrypt() will be called each time if $changed === true
* typically this happens when using one or more of following public methods:
*
* - First run of encrypt() / decrypt()
*
- *
- * Note: Could, but not must, extend by the child Crypt_* class
- *
- * @see setKey()
- * @see setIV()
- * @see disableContinuousBuffer()
+ * @see self::setKey()
+ * @see self::setIV()
+ * @see self::disableContinuousBuffer()
* @access private
+ * @internal Could, but not must, extend by the child Crypt_* class
*/
function _setupMcrypt()
{
if (!isset($this->enmcrypt)) {
static $mcrypt_modes = array(
- CRYPT_MODE_CTR => 'ctr',
- CRYPT_MODE_ECB => MCRYPT_MODE_ECB,
- CRYPT_MODE_CBC => MCRYPT_MODE_CBC,
- CRYPT_MODE_CFB => 'ncfb',
- CRYPT_MODE_OFB => MCRYPT_MODE_NOFB,
- CRYPT_MODE_STREAM => MCRYPT_MODE_STREAM,
+ self::MODE_CTR => 'ctr',
+ self::MODE_ECB => MCRYPT_MODE_ECB,
+ self::MODE_CBC => MCRYPT_MODE_CBC,
+ self::MODE_CFB => 'ncfb',
+ self::MODE_OFB => MCRYPT_MODE_NOFB,
+ self::MODE_STREAM => MCRYPT_MODE_STREAM,
);
- $this->demcrypt = mcrypt_module_open($this->cipher_name_mcrypt, '', $mcrypt_modes[$this->mode], '');
- $this->enmcrypt = mcrypt_module_open($this->cipher_name_mcrypt, '', $mcrypt_modes[$this->mode], '');
+ $this->demcrypt = @mcrypt_module_open($this->cipher_name_mcrypt, '', $mcrypt_modes[$this->mode], '');
+ $this->enmcrypt = @mcrypt_module_open($this->cipher_name_mcrypt, '', $mcrypt_modes[$this->mode], '');
// we need the $ecb mcrypt resource (only) in MODE_CFB with enableContinuousBuffer()
// to workaround mcrypt's broken ncfb implementation in buffered mode
// see: {@link http://phpseclib.sourceforge.net/cfb-demo.phps}
- if ($this->mode == CRYPT_MODE_CFB) {
- $this->ecb = mcrypt_module_open($this->cipher_name_mcrypt, '', MCRYPT_MODE_ECB, '');
+ if ($this->mode == self::MODE_CFB) {
+ $this->ecb = @mcrypt_module_open($this->cipher_name_mcrypt, '', MCRYPT_MODE_ECB, '');
}
-
} // else should mcrypt_generic_deinit be called?
- if ($this->mode == CRYPT_MODE_CFB) {
- mcrypt_generic_init($this->ecb, $this->key, str_repeat("\0", $this->block_size));
+ if ($this->mode == self::MODE_CFB) {
+ @mcrypt_generic_init($this->ecb, $this->key, str_repeat("\0", $this->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_Base::_unpad()
- * @param String $text
+ * @see self::_unpad()
+ * @param string $text
* @access private
- * @return String
+ * @return string
*/
function _pad($text)
{
* 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_Base::_pad()
- * @param String $text
+ * @see self::_pad()
+ * @param string $text
* @access private
- * @return String
+ * @return string
*/
function _unpad($text)
{
* after disableContinuousBuffer() or on cipher $engine (re)init
* ie after setKey() or setIV()
*
- * Note: Could, but not must, extend by the child Crypt_* class
- *
* @access public
+ * @internal Could, but not must, extend by the child Crypt_* class
*/
function _clearBuffers()
{
- $this->enbuffer = array('encrypted' => '', 'xor' => '', 'pos' => 0, 'enmcrypt_init' => true);
- $this->debuffer = array('ciphertext' => '', 'xor' => '', 'pos' => 0, 'demcrypt_init' => true);
+ $this->enbuffer = $this->debuffer = array('ciphertext' => '', 'xor' => '', 'pos' => 0, 'enmcrypt_init' => true);
// mcrypt's handling of invalid's $iv:
// $this->encryptIV = $this->decryptIV = strlen($this->iv) == $this->block_size ? $this->iv : str_repeat("\0", $this->block_size);
$this->encryptIV = $this->decryptIV = str_pad(substr($this->iv, 0, $this->block_size), $this->block_size, "\0");
+
+ if (!$this->skip_key_adjustment) {
+ $this->key = str_pad(substr($this->key, 0, $this->key_length), $this->key_length, "\0");
+ }
}
/**
*
* Inspired by array_shift
*
- * @param String $string
- * @param optional Integer $index
+ * @param string $string
+ * @param int $index
* @access private
- * @return String
+ * @return string
*/
- function _stringShift(&$string, $index = 1)
+ function _string_shift(&$string, $index = 1)
{
$substr = substr($string, 0, $index);
$string = substr($string, $index);
}
/**
- * Generate CTR XOR encryption key
+ * String Pop
*
- * Encrypt the output of this and XOR it against the ciphertext / plaintext to get the
- * plaintext / ciphertext in CTR mode.
+ * Inspired by array_pop
*
- * @see Crypt_Base::decrypt()
- * @see Crypt_Base::encrypt()
- * @param String $iv
- * @param Integer $length
+ * @param string $string
+ * @param int $index
* @access private
- * @return String $xor
+ * @return string
*/
- function _generateXor(&$iv, $length)
+ function _string_pop(&$string, $index = 1)
{
- $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;
- }
+ $substr = substr($string, -$index);
+ $string = substr($string, 0, -$index);
+ return $substr;
+ }
+
+ /**
+ * Increment the current string
+ *
+ * @see self::decrypt()
+ * @see self::encrypt()
+ * @param string $var
+ * @access private
+ */
+ function _increment_str(&$var)
+ {
+ for ($i = 4; $i <= strlen($var); $i+= 4) {
+ $temp = substr($var, -$i, 4);
+ switch ($temp) {
+ case "\xFF\xFF\xFF\xFF":
+ $var = substr_replace($var, "\x00\x00\x00\x00", -$i, 4);
+ break;
+ case "\x7F\xFF\xFF\xFF":
+ $var = substr_replace($var, "\x80\x00\x00\x00", -$i, 4);
+ return;
+ default:
+ $temp = unpack('Nnum', $temp);
+ $var = substr_replace($var, pack('N', $temp['num'] + 1), -$i, 4);
+ return;
}
}
- return $xor;
+ $remainder = strlen($var) % 4;
+
+ if ($remainder == 0) {
+ return;
+ }
+
+ $temp = unpack('Nnum', str_pad(substr($var, 0, $remainder), 4, "\0", STR_PAD_LEFT));
+ $temp = substr(pack('N', $temp['num'] + 1), -$remainder);
+ $var = substr_replace($var, $temp, 0, $remainder);
}
/**
*
* _setupInlineCrypt() would be called only if:
*
- * - $engine == CRYPT_MODE_INTERNAL and
+ * - $engine == self::ENGINE_INTERNAL and
*
* - $use_inline_crypt === true
*
* - short (as good as possible)
*
* Note: - _setupInlineCrypt() is using _createInlineCryptFunction() to create the full callback function code.
- * - In case of using inline crypting, _setupInlineCrypt() must extend by the child Crypt_* class.
+ * - In case of using inline crypting, _setupInlineCrypt() must extend by the child \phpseclib\Crypt\* class.
* - The following variable names are reserved:
* - $_* (all variable names prefixed with an underscore)
* - $self (object reference to it self. Do not use $this, but $self instead)
* - The callback function should not use the 'return' statement, but en/decrypt'ing the content of $in only
*
*
- * @see Crypt_Base::_setup()
- * @see Crypt_Base::_createInlineCryptFunction()
- * @see Crypt_Base::encrypt()
- * @see Crypt_Base::decrypt()
+ * @see self::_setup()
+ * @see self::_createInlineCryptFunction()
+ * @see self::encrypt()
+ * @see self::decrypt()
* @access private
+ * @internal If a Crypt_* class providing inline crypting it must extend _setupInlineCrypt()
*/
function _setupInlineCrypt()
{
- // If a Crypt_* class providing inline crypting it must extend _setupInlineCrypt()
-
- // If, for any reason, an extending Crypt_Base() Crypt_* class
+ // If, for any reason, an extending \phpseclib\Crypt\Base() \phpseclib\Crypt\* class
// not using inline crypting then it must be ensured that: $this->use_inline_crypt = false
- // ie in the class var declaration of $use_inline_crypt in general for the Crypt_* class,
+ // ie in the class var declaration of $use_inline_crypt in general for the \phpseclib\Crypt\* class,
// in the constructor at object instance-time
// or, if it's runtime-specific, at runtime
* +----------------------------------------------------------------------------------------------+
* </code>
*
- * See also the Crypt_*::_setupInlineCrypt()'s for
+ * See also the \phpseclib\Crypt\*::_setupInlineCrypt()'s for
* productive inline $cipher_code's how they works.
*
* Structure of:
* );
* </code>
*
- * @see Crypt_Base::_setupInlineCrypt()
- * @see Crypt_Base::encrypt()
- * @see Crypt_Base::decrypt()
- * @param Array $cipher_code
+ * @see self::_setupInlineCrypt()
+ * @see self::encrypt()
+ * @see self::decrypt()
+ * @param array $cipher_code
* @access private
- * @return String (the name of the created callback function)
+ * @return string (the name of the created callback function)
*/
function _createInlineCryptFunction($cipher_code)
{
// merged with the $cipher_code algorithm
// for encrypt- and decryption.
switch ($this->mode) {
- case CRYPT_MODE_ECB:
+ case self::MODE_ECB:
$encrypt = $init_encrypt . '
$_ciphertext = "";
- $_text = $self->_pad($_text);
$_plaintext_len = strlen($_text);
for ($_i = 0; $_i < $_plaintext_len; $_i+= '.$block_size.') {
return $self->_unpad($_plaintext);
';
break;
- case CRYPT_MODE_CTR:
+ case self::MODE_CTR:
$encrypt = $init_encrypt . '
$_ciphertext = "";
$_plaintext_len = strlen($_text);
$_xor = $self->encryptIV;
$_buffer = &$self->enbuffer;
-
- if (strlen($_buffer["encrypted"])) {
+ if (strlen($_buffer["ciphertext"])) {
for ($_i = 0; $_i < $_plaintext_len; $_i+= '.$block_size.') {
$_block = substr($_text, $_i, '.$block_size.');
- if (strlen($_block) > strlen($_buffer["encrypted"])) {
- $in = $self->_generateXor($_xor, '.$block_size.');
+ if (strlen($_block) > strlen($_buffer["ciphertext"])) {
+ $in = $_xor;
'.$encrypt_block.'
- $_buffer["encrypted"].= $in;
+ $self->_increment_str($_xor);
+ $_buffer["ciphertext"].= $in;
}
- $_key = $self->_stringShift($_buffer["encrypted"], '.$block_size.');
+ $_key = $self->_string_shift($_buffer["ciphertext"], '.$block_size.');
$_ciphertext.= $_block ^ $_key;
}
} else {
for ($_i = 0; $_i < $_plaintext_len; $_i+= '.$block_size.') {
$_block = substr($_text, $_i, '.$block_size.');
- $in = $self->_generateXor($_xor, '.$block_size.');
+ $in = $_xor;
'.$encrypt_block.'
+ $self->_increment_str($_xor);
$_key = $in;
$_ciphertext.= $_block ^ $_key;
}
if ($self->continuousBuffer) {
$self->encryptIV = $_xor;
if ($_start = $_plaintext_len % '.$block_size.') {
- $_buffer["encrypted"] = substr($_key, $_start) . $_buffer["encrypted"];
+ $_buffer["ciphertext"] = substr($_key, $_start) . $_buffer["ciphertext"];
}
}
for ($_i = 0; $_i < $_ciphertext_len; $_i+= '.$block_size.') {
$_block = substr($_text, $_i, '.$block_size.');
if (strlen($_block) > strlen($_buffer["ciphertext"])) {
- $in = $self->_generateXor($_xor, '.$block_size.');
+ $in = $_xor;
'.$encrypt_block.'
+ $self->_increment_str($_xor);
$_buffer["ciphertext"].= $in;
}
- $_key = $self->_stringShift($_buffer["ciphertext"], '.$block_size.');
+ $_key = $self->_string_shift($_buffer["ciphertext"], '.$block_size.');
$_plaintext.= $_block ^ $_key;
}
} else {
for ($_i = 0; $_i < $_ciphertext_len; $_i+= '.$block_size.') {
$_block = substr($_text, $_i, '.$block_size.');
- $in = $self->_generateXor($_xor, '.$block_size.');
+ $in = $_xor;
'.$encrypt_block.'
+ $self->_increment_str($_xor);
$_key = $in;
$_plaintext.= $_block ^ $_key;
}
return $_plaintext;
';
break;
- case CRYPT_MODE_CFB:
+ case self::MODE_CFB:
$encrypt = $init_encrypt . '
$_ciphertext = "";
$_buffer = &$self->enbuffer;
return $_plaintext;
';
break;
- case CRYPT_MODE_OFB:
+ case self::MODE_OFB:
$encrypt = $init_encrypt . '
$_ciphertext = "";
$_plaintext_len = strlen($_text);
$_xor = $in;
$_buffer["xor"].= $_xor;
}
- $_key = $self->_stringShift($_buffer["xor"], '.$block_size.');
+ $_key = $self->_string_shift($_buffer["xor"], '.$block_size.');
$_ciphertext.= $_block ^ $_key;
}
} else {
$_xor = $in;
$_buffer["xor"].= $_xor;
}
- $_key = $self->_stringShift($_buffer["xor"], '.$block_size.');
+ $_key = $self->_string_shift($_buffer["xor"], '.$block_size.');
$_plaintext.= $_block ^ $_key;
}
} else {
return $_plaintext;
';
break;
- case CRYPT_MODE_STREAM:
+ case self::MODE_STREAM:
$encrypt = $init_encrypt . '
$_ciphertext = "";
'.$encrypt_block.'
return $_plaintext;
';
break;
- // case CRYPT_MODE_CBC:
+ // case self::MODE_CBC:
default:
$encrypt = $init_encrypt . '
$_ciphertext = "";
- $_text = $self->_pad($_text);
$_plaintext_len = strlen($_text);
$in = $self->encryptIV;
* is stored, classwide (!), here for reusing.
*
* The string-based index of $function is a classwide
- * uniqe value representing, at least, the $mode of
+ * unique value representing, at least, the $mode of
* operation (or more... depends of the optimizing level)
* for which $mode the lambda function was created.
*
* @access private
- * @return &Array
+ * @return array &$functions
*/
function &_getLambdaFunctions()
{
static $functions = array();
return $functions;
}
+
+ /**
+ * Generates a digest from $bytes
+ *
+ * @see self::_setupInlineCrypt()
+ * @access private
+ * @param $bytes
+ * @return string
+ */
+ function _hashInlineCryptFunction($bytes)
+ {
+ if (!isset(self::$WHIRLPOOL_AVAILABLE)) {
+ self::$WHIRLPOOL_AVAILABLE = extension_loaded('hash') && in_array('whirlpool', hash_algos());
+ }
+
+ $result = '';
+ $hash = $bytes;
+
+ switch (true) {
+ case self::$WHIRLPOOL_AVAILABLE:
+ foreach (str_split($bytes, 64) as $t) {
+ $hash = hash('whirlpool', $hash, true);
+ $result .= $t ^ $hash;
+ }
+ return $result . hash('whirlpool', $hash, true);
+ default:
+ $len = strlen($bytes);
+ for ($i = 0; $i < $len; $i+=20) {
+ $t = substr($bytes, $i, 20);
+ $hash = pack('H*', sha1($hash));
+ $result .= $t ^ $hash;
+ }
+ return $result . pack('H*', sha1($hash));
+ }
+ }
}
https://reisub.nsupdate.info/git / friendica-addons.git / .git / blobdiff