<?php | |
/** | |
* Base Class for all Crypt_* cipher classes | |
* | |
* PHP versions 4 and 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 | |
* | |
* - Following methods are then required to be overridden/overloaded: | |
* | |
* - _encryptBlock() | |
* | |
* - _decryptBlock() | |
* | |
* - _setupKey() | |
* | |
* - All other methods are optional to be overridden/overloaded | |
* | |
* - Look at the source code of the current ciphers how they extend 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 | |
* @author Jim Wigginton <terrafrost@php.net> | |
* @author Hans-Juergen Petrich <petrich@tronic-media.com> | |
* @copyright 2007 Jim Wigginton | |
* @license http://www.opensource.org/licenses/mit-license.html MIT License | |
* @link http://phpseclib.sourceforge.net | |
*/ | |
/**#@+ | |
* @access public | |
* @see self::encrypt() | |
* @see self::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 self::Crypt_Base() | |
* @internal These constants are for internal use only | |
*/ | |
/** | |
* Base value for the internal implementation $engine switch | |
*/ | |
define('CRYPT_ENGINE_INTERNAL', 1); | |
/** | |
* Base value for the mcrypt implementation $engine switch | |
*/ | |
define('CRYPT_ENGINE_MCRYPT', 2); | |
/** | |
* Base value for the OpenSSL implementation $engine switch | |
*/ | |
define('CRYPT_ENGINE_OPENSSL', 3); | |
/**#@-*/ | |
/** | |
* Base Class for all Crypt_* cipher classes | |
* | |
* @package Crypt_Base | |
* @author Jim Wigginton <terrafrost@php.net> | |
* @author Hans-Juergen Petrich <petrich@tronic-media.com> | |
* @access public | |
*/ | |
class Crypt_Base | |
{ | |
/** | |
* The Encryption Mode | |
* | |
* @see self::Crypt_Base() | |
* @var int | |
* @access private | |
*/ | |
var $mode; | |
/** | |
* The Block Length of the block cipher | |
* | |
* @var int | |
* @access private | |
*/ | |
var $block_size = 16; | |
/** | |
* The Key | |
* | |
* @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 self::setIV() | |
* @var string | |
* @access private | |
*/ | |
var $iv; | |
/** | |
* A "sliding" Initialization Vector | |
* | |
* @see self::enableContinuousBuffer() | |
* @see self::_clearBuffers() | |
* @var string | |
* @access private | |
*/ | |
var $encryptIV; | |
/** | |
* A "sliding" Initialization Vector | |
* | |
* @see self::enableContinuousBuffer() | |
* @see self::_clearBuffers() | |
* @var string | |
* @access private | |
*/ | |
var $decryptIV; | |
/** | |
* Continuous Buffer status | |
* | |
* @see self::enableContinuousBuffer() | |
* @var bool | |
* @access private | |
*/ | |
var $continuousBuffer = false; | |
/** | |
* Encryption buffer for CTR, OFB and CFB modes | |
* | |
* @see self::encrypt() | |
* @see self::_clearBuffers() | |
* @var array | |
* @access private | |
*/ | |
var $enbuffer; | |
/** | |
* Decryption buffer for CTR, OFB and CFB modes | |
* | |
* @see self::decrypt() | |
* @see self::_clearBuffers() | |
* @var array | |
* @access private | |
*/ | |
var $debuffer; | |
/** | |
* 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 self::encrypt() | |
* @var resource | |
* @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 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 bool | |
* @access private | |
*/ | |
var $enchanged = true; | |
/** | |
* Does the demcrypt resource need to be (re)initialized? | |
* | |
* @see Crypt_Twofish::setKey() | |
* @see Crypt_Twofish::setIV() | |
* @var bool | |
* @access private | |
*/ | |
var $dechanged = true; | |
/** | |
* mcrypt resource for CFB mode | |
* | |
* mcrypt's CFB mode, in (and only in) buffered context, | |
* is broken, so phpseclib implements the CFB mode by it self, | |
* even when the mcrypt php extension is available. | |
* | |
* In order to do the CFB-mode work (fast) phpseclib | |
* use a separate ECB-mode mcrypt resource. | |
* | |
* @link http://phpseclib.sourceforge.net/cfb-demo.phps | |
* @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_ENGINE_MCRYPT | |
* | |
* It's faster to re-init $enmcrypt if | |
* $buffer bytes > $cfb_init_len than | |
* using the $ecb resource furthermore. | |
* | |
* This value depends of the chosen cipher | |
* and the time it would be needed for it's | |
* initialization [by mcrypt_generic_init()] | |
* which, typically, depends on the complexity | |
* on its internaly Key-expanding algorithm. | |
* | |
* @see self::encrypt() | |
* @var int | |
* @access private | |
*/ | |
var $cfb_init_len = 600; | |
/** | |
* Does internal cipher state need to be (re)initialized? | |
* | |
* @see self::setKey() | |
* @see self::setIV() | |
* @see self::disableContinuousBuffer() | |
* @var bool | |
* @access private | |
*/ | |
var $changed = true; | |
/** | |
* Padding status | |
* | |
* @see self::enablePadding() | |
* @var bool | |
* @access private | |
*/ | |
var $padding = true; | |
/** | |
* Is the mode one that is paddable? | |
* | |
* @see self::Crypt_Base() | |
* @var bool | |
* @access private | |
*/ | |
var $paddable = false; | |
/** | |
* Holds which crypt engine internaly should be use, | |
* which will be determined automatically on __construct() | |
* | |
* Currently available $engines are: | |
* - CRYPT_ENGINE_OPENSSL (very fast, php-extension: openssl, extension_loaded('openssl') required) | |
* - CRYPT_ENGINE_MCRYPT (fast, php-extension: mcrypt, extension_loaded('mcrypt') required) | |
* - CRYPT_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_ENGINE_MCRYPT | |
* | |
* @link http://www.php.net/mcrypt_module_open | |
* @link http://www.php.net/mcrypt_list_algorithms | |
* @see self::_setupMcrypt() | |
* @var string | |
* @access private | |
*/ | |
var $cipher_name_mcrypt; | |
/** | |
* The openssl specific name of the cipher | |
* | |
* Only used if $engine == CRYPT_ENGINE_OPENSSL | |
* | |
* @link http://www.php.net/openssl-get-cipher-methods | |
* @var string | |
* @access private | |
*/ | |
var $cipher_name_openssl; | |
/** | |
* 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. | |
* | |
* @link http://www.php.net/openssl-get-cipher-methods | |
* @var string | |
* @access private | |
*/ | |
var $cipher_name_openssl_ecb; | |
/** | |
* The default salt used by setPassword() | |
* | |
* @see self::setPassword() | |
* @var string | |
* @access private | |
*/ | |
var $password_default_salt = 'phpseclib/salt'; | |
/** | |
* 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 | |
* | |
* @see self::Crypt_Base() | |
* @var string | |
* @access private | |
*/ | |
var $const_namespace; | |
/** | |
* The name of the performance-optimized callback function | |
* | |
* Used by encrypt() / decrypt() | |
* only if $engine == CRYPT_ENGINE_INTERNAL | |
* | |
* @see self::encrypt() | |
* @see self::decrypt() | |
* @see self::_setupInlineCrypt() | |
* @see self::$use_inline_crypt | |
* @var Callback | |
* @access private | |
*/ | |
var $inline_crypt; | |
/** | |
* Holds whether performance-optimized $inline_crypt() can/should be used. | |
* | |
* @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. | |
* | |
* Determines whether or not the mcrypt extension should be used. | |
* | |
* $mode could be: | |
* | |
* - CRYPT_MODE_ECB | |
* | |
* - CRYPT_MODE_CBC | |
* | |
* - CRYPT_MODE_CTR | |
* | |
* - CRYPT_MODE_CFB | |
* | |
* - CRYPT_MODE_OFB | |
* | |
* (or the alias constants of the chosen cipher, for example for AES: CRYPT_AES_MODE_ECB or CRYPT_AES_MODE_CBC ...) | |
* | |
* If not explicitly set, CRYPT_MODE_CBC will be used. | |
* | |
* @param int $mode | |
* @access public | |
*/ | |
function __construct($mode = CRYPT_MODE_CBC) | |
{ | |
// $mode dependent settings | |
switch ($mode) { | |
case CRYPT_MODE_ECB: | |
$this->paddable = true; | |
$this->mode = CRYPT_MODE_ECB; | |
break; | |
case CRYPT_MODE_CTR: | |
case CRYPT_MODE_CFB: | |
case CRYPT_MODE_OFB: | |
case CRYPT_MODE_STREAM: | |
$this->mode = $mode; | |
break; | |
case CRYPT_MODE_CBC: | |
default: | |
$this->paddable = true; | |
$this->mode = CRYPT_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; | |
} | |
} | |
/** | |
* PHP4 compatible Default Constructor. | |
* | |
* @see self::__construct() | |
* @param int $mode | |
* @access public | |
*/ | |
function Crypt_Base($mode = CRYPT_MODE_CBC) | |
{ | |
$this->__construct($mode); | |
} | |
/** | |
* 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 | |
* to be all zero's. | |
* | |
* @access public | |
* @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) { | |
return; | |
} | |
$this->iv = $iv; | |
$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. | |
* | |
* The min/max length(s) of the key depends on the cipher which is used. | |
* If the key not fits the length(s) of the cipher it will paded with null bytes | |
* up to the closest valid key length. If the key is more than max length, | |
* we trim the excess bits. | |
* | |
* If the key is not explicitly set, it'll be assumed to be all null bytes. | |
* | |
* @access public | |
* @param string $key | |
* @internal Could, but not must, extend by the child Crypt_* class | |
*/ | |
function setKey($key) | |
{ | |
if (!$this->explicit_key_length) { | |
$this->setKeyLength(strlen($key) << 3); | |
$this->explicit_key_length = false; | |
} | |
$this->key = $key; | |
$this->changed = true; | |
$this->_setEngine(); | |
} | |
/** | |
* Sets the password. | |
* | |
* Depending on what $method is set to, setPassword()'s (optional) parameters are as follows: | |
* {@link http://en.wikipedia.org/wiki/PBKDF2 pbkdf2} or pbkdf1: | |
* $hash, $salt, $count, $dkLen | |
* | |
* Where $hash (default = sha1) currently supports the following hashes: see: Crypt/Hash.php | |
* | |
* @see Crypt/Hash.php | |
* @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') | |
{ | |
$key = ''; | |
switch ($method) { | |
default: // 'pbkdf2' or 'pbkdf1' | |
$func_args = func_get_args(); | |
// Hash function | |
$hash = isset($func_args[2]) ? $func_args[2] : 'sha1'; | |
// WPA and WPA2 use the SSID as the salt | |
$salt = isset($func_args[3]) ? $func_args[3] : $this->password_default_salt; | |
// RFC2898#section-4.2 uses 1,000 iterations by default | |
// WPA and WPA2 use 4,096. | |
$count = isset($func_args[4]) ? $func_args[4] : 1000; | |
// Keylength | |
if (isset($func_args[5])) { | |
$dkLen = $func_args[5]; | |
} else { | |
$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(); | |
$hashObj->setHash($hash); | |
if ($dkLen > $hashObj->getLength()) { | |
user_error('Derived key too long'); | |
return false; | |
} | |
$t = $password . $salt; | |
for ($i = 0; $i < $count; ++$i) { | |
$t = $hashObj->hash($t); | |
} | |
$key = substr($t, 0, $dkLen); | |
$this->setKey(substr($key, 0, $dkLen >> 1)); | |
$this->setIV(substr($key, $dkLen >> 1)); | |
return true; | |
// Determining if php[>=5.5.0]'s hash_pbkdf2() function avail- and useable | |
case !function_exists('hash_pbkdf2'): | |
case !function_exists('hash_algos'): | |
case !in_array($hash, hash_algos()): | |
if (!class_exists('Crypt_Hash')) { | |
include_once 'Crypt/Hash.php'; | |
} | |
$i = 1; | |
while (strlen($key) < $dkLen) { | |
$hmac = new Crypt_Hash(); | |
$hmac->setHash($hash); | |
$hmac->setKey($password); | |
$f = $u = $hmac->hash($salt . pack('N', $i++)); | |
for ($j = 2; $j <= $count; ++$j) { | |
$u = $hmac->hash($u); | |
$f^= $u; | |
} | |
$key.= $f; | |
} | |
$key = substr($key, 0, $dkLen); | |
break; | |
default: | |
$key = hash_pbkdf2($hash, $password, $salt, $count, $dkLen, true); | |
} | |
} | |
$this->setKey($key); | |
return true; | |
} | |
/** | |
* Encrypts a message. | |
* | |
* $plaintext will be padded with additional bytes such that it's length is a multiple of the block size. Other cipher | |
* implementations may or may not pad in the same manner. Other common approaches to padding and the reasons why it's | |
* necessary are discussed in the following | |
* URL: | |
* | |
* {@link http://www.di-mgt.com.au/cryptopad.html http://www.di-mgt.com.au/cryptopad.html} | |
* | |
* An alternative to padding is to, separately, send the length of the file. This is what SSH, in fact, does. | |
* strlen($plaintext) will still need to be a multiple of the block size, however, arbitrary values can be added to make it that | |
* length. | |
* | |
* @see self::decrypt() | |
* @access public | |
* @param string $plaintext | |
* @return string $ciphertext | |
* @internal Could, but not must, extend by the child Crypt_* class | |
*/ | |
function encrypt($plaintext) | |
{ | |
if ($this->paddable) { | |
$plaintext = $this->_pad($plaintext); | |
} | |
if ($this->engine === CRYPT_ENGINE_OPENSSL) { | |
if ($this->changed) { | |
$this->_clearBuffers(); | |
$this->changed = false; | |
} | |
switch ($this->mode) { | |
case CRYPT_MODE_STREAM: | |
return openssl_encrypt($plaintext, $this->cipher_name_openssl, $this->key, $this->openssl_options); | |
case CRYPT_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 CRYPT_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 CRYPT_MODE_CTR: | |
return $this->_openssl_ctr_process($plaintext, $this->encryptIV, $this->enbuffer); | |
case CRYPT_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 CRYPT_MODE_OFB: | |
return $this->_openssl_ofb_process($plaintext, $this->encryptIV, $this->enbuffer); | |
} | |
} | |
if ($this->engine === CRYPT_ENGINE_MCRYPT) { | |
if ($this->changed) { | |
$this->_setupMcrypt(); | |
$this->changed = false; | |
} | |
if ($this->enchanged) { | |
@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) { | |
$block_size = $this->block_size; | |
$iv = &$this->encryptIV; | |
$pos = &$this->enbuffer['pos']; | |
$len = strlen($plaintext); | |
$ciphertext = ''; | |
$i = 0; | |
if ($pos) { | |
$orig_pos = $pos; | |
$max = $block_size - $pos; | |
if ($len >= $max) { | |
$i = $max; | |
$len-= $max; | |
$pos = 0; | |
} else { | |
$i = $len; | |
$pos+= $len; | |
$len = 0; | |
} | |
$ciphertext = substr($iv, $orig_pos) ^ $plaintext; | |
$iv = substr_replace($iv, $ciphertext, $orig_pos, $i); | |
$this->enbuffer['enmcrypt_init'] = true; | |
} | |
if ($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); | |
$this->enbuffer['enmcrypt_init'] = false; | |
} | |
$ciphertext.= @mcrypt_generic($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); | |
$ciphertext.= $iv; | |
$len-= $block_size; | |
$i+= $block_size; | |
} | |
} | |
} | |
if ($len) { | |
$iv = @mcrypt_generic($this->ecb, $iv); | |
$block = $iv ^ substr($plaintext, -$len); | |
$iv = substr_replace($iv, $block, 0, $len); | |
$ciphertext.= $block; | |
$pos = $len; | |
} | |
return $ciphertext; | |
} | |
$ciphertext = @mcrypt_generic($this->enmcrypt, $plaintext); | |
if (!$this->continuousBuffer) { | |
@mcrypt_generic_init($this->enmcrypt, $this->key, $this->encryptIV); | |
} | |
return $ciphertext; | |
} | |
if ($this->changed) { | |
$this->_setup(); | |
$this->changed = false; | |
} | |
if ($this->use_inline_crypt) { | |
$inline = $this->inline_crypt; | |
return $inline('encrypt', $this, $plaintext); | |
} | |
$buffer = &$this->enbuffer; | |
$block_size = $this->block_size; | |
$ciphertext = ''; | |
switch ($this->mode) { | |
case CRYPT_MODE_ECB: | |
for ($i = 0; $i < strlen($plaintext); $i+=$block_size) { | |
$ciphertext.= $this->_encryptBlock(substr($plaintext, $i, $block_size)); | |
} | |
break; | |
case CRYPT_MODE_CBC: | |
$xor = $this->encryptIV; | |
for ($i = 0; $i < strlen($plaintext); $i+=$block_size) { | |
$block = substr($plaintext, $i, $block_size); | |
$block = $this->_encryptBlock($block ^ $xor); | |
$xor = $block; | |
$ciphertext.= $block; | |
} | |
if ($this->continuousBuffer) { | |
$this->encryptIV = $xor; | |
} | |
break; | |
case CRYPT_MODE_CTR: | |
$xor = $this->encryptIV; | |
if (strlen($buffer['ciphertext'])) { | |
for ($i = 0; $i < strlen($plaintext); $i+=$block_size) { | |
$block = substr($plaintext, $i, $block_size); | |
if (strlen($block) > strlen($buffer['ciphertext'])) { | |
$buffer['ciphertext'].= $this->_encryptBlock($xor); | |
} | |
$this->_increment_str($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 = $this->_encryptBlock($xor); | |
$this->_increment_str($xor); | |
$ciphertext.= $block ^ $key; | |
} | |
} | |
if ($this->continuousBuffer) { | |
$this->encryptIV = $xor; | |
if ($start = strlen($plaintext) % $block_size) { | |
$buffer['ciphertext'] = substr($key, $start) . $buffer['ciphertext']; | |
} | |
} | |
break; | |
case CRYPT_MODE_CFB: | |
// cfb loosely routines inspired by openssl's: | |
// {@link http://cvs.openssl.org/fileview?f=openssl/crypto/modes/cfb128.c&v=1.3.2.2.2.1} | |
if ($this->continuousBuffer) { | |
$iv = &$this->encryptIV; | |
$pos = &$buffer['pos']; | |
} else { | |
$iv = $this->encryptIV; | |
$pos = 0; | |
} | |
$len = strlen($plaintext); | |
$i = 0; | |
if ($pos) { | |
$orig_pos = $pos; | |
$max = $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, $i); | |
} | |
while ($len >= $block_size) { | |
$iv = $this->_encryptBlock($iv) ^ substr($plaintext, $i, $block_size); | |
$ciphertext.= $iv; | |
$len-= $block_size; | |
$i+= $block_size; | |
} | |
if ($len) { | |
$iv = $this->_encryptBlock($iv); | |
$block = $iv ^ substr($plaintext, $i); | |
$iv = substr_replace($iv, $block, 0, $len); | |
$ciphertext.= $block; | |
$pos = $len; | |
} | |
break; | |
case CRYPT_MODE_OFB: | |
$xor = $this->encryptIV; | |
if (strlen($buffer['xor'])) { | |
for ($i = 0; $i < strlen($plaintext); $i+=$block_size) { | |
$block = substr($plaintext, $i, $block_size); | |
if (strlen($block) > strlen($buffer['xor'])) { | |
$xor = $this->_encryptBlock($xor); | |
$buffer['xor'].= $xor; | |
} | |
$key = $this->_string_shift($buffer['xor'], $block_size); | |
$ciphertext.= $block ^ $key; | |
} | |
} else { | |
for ($i = 0; $i < strlen($plaintext); $i+=$block_size) { | |
$xor = $this->_encryptBlock($xor); | |
$ciphertext.= substr($plaintext, $i, $block_size) ^ $xor; | |
} | |
$key = $xor; | |
} | |
if ($this->continuousBuffer) { | |
$this->encryptIV = $xor; | |
if ($start = strlen($plaintext) % $block_size) { | |
$buffer['xor'] = substr($key, $start) . $buffer['xor']; | |
} | |
} | |
break; | |
case CRYPT_MODE_STREAM: | |
$ciphertext = $this->_encryptBlock($plaintext); | |
break; | |
} | |
return $ciphertext; | |
} | |
/** | |
* Decrypts a message. | |
* | |
* If strlen($ciphertext) is not a multiple of the block size, null bytes will be added to the end of the string until | |
* it is. | |
* | |
* @see self::encrypt() | |
* @access public | |
* @param string $ciphertext | |
* @return string $plaintext | |
* @internal Could, but not must, extend by the child Crypt_* class | |
*/ | |
function decrypt($ciphertext) | |
{ | |
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 === CRYPT_ENGINE_OPENSSL) { | |
if ($this->changed) { | |
$this->_clearBuffers(); | |
$this->changed = false; | |
} | |
switch ($this->mode) { | |
case CRYPT_MODE_STREAM: | |
$plaintext = openssl_decrypt($ciphertext, $this->cipher_name_openssl, $this->key, $this->openssl_options); | |
break; | |
case CRYPT_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 CRYPT_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 CRYPT_MODE_CTR: | |
$plaintext = $this->_openssl_ctr_process($ciphertext, $this->decryptIV, $this->debuffer); | |
break; | |
case CRYPT_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 CRYPT_MODE_OFB: | |
$plaintext = $this->_openssl_ofb_process($ciphertext, $this->decryptIV, $this->debuffer); | |
} | |
return $this->paddable ? $this->_unpad($plaintext) : $plaintext; | |
} | |
if ($this->engine === CRYPT_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); | |
$this->dechanged = false; | |
} | |
if ($this->mode == CRYPT_MODE_CFB && $this->continuousBuffer) { | |
$iv = &$this->decryptIV; | |
$pos = &$this->debuffer['pos']; | |
$len = strlen($ciphertext); | |
$plaintext = ''; | |
$i = 0; | |
if ($pos) { | |
$orig_pos = $pos; | |
$max = $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 | |
$plaintext = substr($iv, $orig_pos) ^ $ciphertext; | |
$iv = substr_replace($iv, substr($ciphertext, 0, $i), $orig_pos, $i); | |
} | |
if ($len >= $block_size) { | |
$cb = substr($ciphertext, $i, $len - $len % $block_size); | |
$plaintext.= @mcrypt_generic($this->ecb, $iv . $cb) ^ $cb; | |
$iv = substr($cb, -$block_size); | |
$len%= $block_size; | |
} | |
if ($len) { | |
$iv = @mcrypt_generic($this->ecb, $iv); | |
$plaintext.= $iv ^ substr($ciphertext, -$len); | |
$iv = substr_replace($iv, substr($ciphertext, -$len), 0, $len); | |
$pos = $len; | |
} | |
return $plaintext; | |
} | |
$plaintext = @mdecrypt_generic($this->demcrypt, $ciphertext); | |
if (!$this->continuousBuffer) { | |
@mcrypt_generic_init($this->demcrypt, $this->key, $this->decryptIV); | |
} | |
return $this->paddable ? $this->_unpad($plaintext) : $plaintext; | |
} | |
if ($this->changed) { | |
$this->_setup(); | |
$this->changed = false; | |
} | |
if ($this->use_inline_crypt) { | |
$inline = $this->inline_crypt; | |
return $inline('decrypt', $this, $ciphertext); | |
} | |
$block_size = $this->block_size; | |
$buffer = &$this->debuffer; | |
$plaintext = ''; | |
switch ($this->mode) { | |
case CRYPT_MODE_ECB: | |
for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) { | |
$plaintext.= $this->_decryptBlock(substr($ciphertext, $i, $block_size)); | |
} | |
break; | |
case CRYPT_MODE_CBC: | |
$xor = $this->decryptIV; | |
for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) { | |
$block = substr($ciphertext, $i, $block_size); | |
$plaintext.= $this->_decryptBlock($block) ^ $xor; | |
$xor = $block; | |
} | |
if ($this->continuousBuffer) { | |
$this->decryptIV = $xor; | |
} | |
break; | |
case CRYPT_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'].= $this->_encryptBlock($xor); | |
$this->_increment_str($xor); | |
} | |
$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 = $this->_encryptBlock($xor); | |
$this->_increment_str($xor); | |
$plaintext.= $block ^ $key; | |
} | |
} | |
if ($this->continuousBuffer) { | |
$this->decryptIV = $xor; | |
if ($start = strlen($ciphertext) % $block_size) { | |
$buffer['ciphertext'] = substr($key, $start) . $buffer['ciphertext']; | |
} | |
} | |
break; | |
case CRYPT_MODE_CFB: | |
if ($this->continuousBuffer) { | |
$iv = &$this->decryptIV; | |
$pos = &$buffer['pos']; | |
} else { | |
$iv = $this->decryptIV; | |
$pos = 0; | |
} | |
$len = strlen($ciphertext); | |
$i = 0; | |
if ($pos) { | |
$orig_pos = $pos; | |
$max = $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 | |
$plaintext = substr($iv, $orig_pos) ^ $ciphertext; | |
$iv = substr_replace($iv, substr($ciphertext, 0, $i), $orig_pos, $i); | |
} | |
while ($len >= $block_size) { | |
$iv = $this->_encryptBlock($iv); | |
$cb = substr($ciphertext, $i, $block_size); | |
$plaintext.= $iv ^ $cb; | |
$iv = $cb; | |
$len-= $block_size; | |
$i+= $block_size; | |
} | |
if ($len) { | |
$iv = $this->_encryptBlock($iv); | |
$plaintext.= $iv ^ substr($ciphertext, $i); | |
$iv = substr_replace($iv, substr($ciphertext, $i), 0, $len); | |
$pos = $len; | |
} | |
break; | |
case CRYPT_MODE_OFB: | |
$xor = $this->decryptIV; | |
if (strlen($buffer['xor'])) { | |
for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) { | |
$block = substr($ciphertext, $i, $block_size); | |
if (strlen($block) > strlen($buffer['xor'])) { | |
$xor = $this->_encryptBlock($xor); | |
$buffer['xor'].= $xor; | |
} | |
$key = $this->_string_shift($buffer['xor'], $block_size); | |
$plaintext.= $block ^ $key; | |
} | |
} else { | |
for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) { | |
$xor = $this->_encryptBlock($xor); | |
$plaintext.= substr($ciphertext, $i, $block_size) ^ $xor; | |
} | |
$key = $xor; | |
} | |
if ($this->continuousBuffer) { | |
$this->decryptIV = $xor; | |
if ($start = strlen($ciphertext) % $block_size) { | |
$buffer['xor'] = substr($key, $start) . $buffer['xor']; | |
} | |
} | |
break; | |
case CRYPT_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 Crypt_Base::encrypt() | |
* and Crypt_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 Crypt_Base::encrypt() | |
* and Crypt_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 CRYPT_MODE_ECB: | |
return 'ecb'; | |
case CRYPT_MODE_CBC: | |
return 'cbc'; | |
case CRYPT_MODE_CTR: | |
return 'ctr'; | |
case CRYPT_MODE_CFB: | |
return 'cfb'; | |
case CRYPT_MODE_OFB: | |
return 'ofb'; | |
} | |
} | |
/** | |
* Pad "packets". | |
* | |
* Block ciphers working by encrypting between their specified [$this->]block_size at a time | |
* If you ever need to encrypt or decrypt something that isn't of the proper length, it becomes necessary to | |
* pad the input so that it is of the proper length. | |
* | |
* Padding is enabled by default. Sometimes, however, it is undesirable to pad strings. Such is the case in SSH, | |
* where "packets" are padded with random bytes before being encrypted. Unpad these packets and you risk stripping | |
* away characters that shouldn't be stripped away. (SSH knows how many bytes are added because the length is | |
* transmitted separately) | |
* | |
* @see self::disablePadding() | |
* @access public | |
*/ | |
function enablePadding() | |
{ | |
$this->padding = true; | |
} | |
/** | |
* Do not pad packets. | |
* | |
* @see self::enablePadding() | |
* @access public | |
*/ | |
function disablePadding() | |
{ | |
$this->padding = false; | |
} | |
/** | |
* Treat consecutive "packets" as if they are a continuous buffer. | |
* | |
* Say you have a 32-byte plaintext $plaintext. Using the default behavior, the two following code snippets | |
* will yield different outputs: | |
* | |
* <code> | |
* echo $rijndael->encrypt(substr($plaintext, 0, 16)); | |
* echo $rijndael->encrypt(substr($plaintext, 16, 16)); | |
* </code> | |
* <code> | |
* echo $rijndael->encrypt($plaintext); | |
* </code> | |
* | |
* The solution is to enable the continuous buffer. Although this will resolve the above discrepancy, it creates | |
* another, as demonstrated with the following: | |
* | |
* <code> | |
* $rijndael->encrypt(substr($plaintext, 0, 16)); | |
* echo $rijndael->decrypt($rijndael->encrypt(substr($plaintext, 16, 16))); | |
* </code> | |
* <code> | |
* echo $rijndael->decrypt($rijndael->encrypt(substr($plaintext, 16, 16))); | |
* </code> | |
* | |
* With the continuous buffer disabled, these would yield the same output. With it enabled, they yield different | |
* outputs. The reason is due to the fact that the initialization vector's change after every encryption / | |
* decryption round when the continuous buffer is enabled. When it's disabled, they remain constant. | |
* | |
* Put another way, when the continuous buffer is enabled, the state of the Crypt_*() object changes after each | |
* encryption / decryption round, whereas otherwise, it'd remain constant. For this reason, it's recommended that | |
* continuous buffers not be used. They do offer better security and are, in fact, sometimes required (SSH uses them), | |
* however, they are also less intuitive and more likely to cause you problems. | |
* | |
* @see self::disableContinuousBuffer() | |
* @access public | |
* @internal Could, but not must, extend by the child Crypt_* class | |
*/ | |
function enableContinuousBuffer() | |
{ | |
if ($this->mode == CRYPT_MODE_ECB) { | |
return; | |
} | |
$this->continuousBuffer = true; | |
$this->_setEngine(); | |
} | |
/** | |
* Treat consecutive packets as if they are a discontinuous buffer. | |
* | |
* The default behavior. | |
* | |
* @see self::enableContinuousBuffer() | |
* @access public | |
* @internal Could, but not must, extend by the child Crypt_* class | |
*/ | |
function disableContinuousBuffer() | |
{ | |
if ($this->mode == CRYPT_MODE_ECB) { | |
return; | |
} | |
if (!$this->continuousBuffer) { | |
return; | |
} | |
$this->continuousBuffer = false; | |
$this->changed = true; | |
$this->_setEngine(); | |
} | |
/** | |
* Test for engine validity | |
* | |
* @see self::Crypt_Base() | |
* @param int $engine | |
* @access public | |
* @return bool | |
*/ | |
function isValidEngine($engine) | |
{ | |
switch ($engine) { | |
case CRYPT_ENGINE_OPENSSL: | |
if ($this->mode == CRYPT_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 CRYPT_MODE_CTR: | |
if (in_array($this->cipher_name_openssl_ecb, $methods)) { | |
$this->openssl_emulate_ctr = true; | |
return true; | |
} | |
} | |
return false; | |
case CRYPT_ENGINE_MCRYPT: | |
return $this->cipher_name_mcrypt && | |
extension_loaded('mcrypt') && | |
in_array($this->cipher_name_mcrypt, @mcrypt_list_algorithms()); | |
case CRYPT_ENGINE_INTERNAL: | |
return true; | |
} | |
return false; | |
} | |
/** | |
* Sets the preferred crypt engine | |
* | |
* Currently, $engine could be: | |
* | |
* - CRYPT_ENGINE_OPENSSL [very fast] | |
* | |
* - CRYPT_ENGINE_MCRYPT [fast] | |
* | |
* - CRYPT_ENGINE_INTERNAL [slow] | |
* | |
* If the preferred crypt engine is not available the fastest available one will be used | |
* | |
* @see self::Crypt_Base() | |
* @param int $engine | |
* @access public | |
*/ | |
function setPreferredEngine($engine) | |
{ | |
switch ($engine) { | |
//case CRYPT_ENGINE_OPENSSL: | |
case CRYPT_ENGINE_MCRYPT: | |
case CRYPT_ENGINE_INTERNAL: | |
$this->preferredEngine = $engine; | |
break; | |
default: | |
$this->preferredEngine = CRYPT_ENGINE_OPENSSL; | |
} | |
$this->_setEngine(); | |
} | |
/** | |
* Returns the engine currently being utilized | |
* | |
* @see self::_setEngine() | |
* @access public | |
*/ | |
function getEngine() | |
{ | |
return $this->engine; | |
} | |
/** | |
* Sets the engine as appropriate | |
* | |
* @see self::Crypt_Base() | |
* @access private | |
*/ | |
function _setEngine() | |
{ | |
$this->engine = null; | |
$candidateEngines = array( | |
$this->preferredEngine, | |
CRYPT_ENGINE_OPENSSL, | |
CRYPT_ENGINE_MCRYPT | |
); | |
foreach ($candidateEngines as $engine) { | |
if ($this->isValidEngine($engine)) { | |
$this->engine = $engine; | |
break; | |
} | |
} | |
if (!$this->engine) { | |
$this->engine = CRYPT_ENGINE_INTERNAL; | |
} | |
if ($this->engine != CRYPT_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 | |
* | |
* @access private | |
* @param string $in | |
* @return string | |
* @internal Must be extended by the child Crypt_* class | |
*/ | |
function _encryptBlock($in) | |
{ | |
user_error((version_compare(PHP_VERSION, '5.0.0', '>=') ? __METHOD__ : __FUNCTION__) . '() must extend by class ' . get_class($this), E_USER_ERROR); | |
} | |
/** | |
* Decrypts a block | |
* | |
* @access private | |
* @param string $in | |
* @return string | |
* @internal Must be extended by the child Crypt_* class | |
*/ | |
function _decryptBlock($in) | |
{ | |
user_error((version_compare(PHP_VERSION, '5.0.0', '>=') ? __METHOD__ : __FUNCTION__) . '() must extend by class ' . get_class($this), E_USER_ERROR); | |
} | |
/** | |
* Setup the key (expansion) | |
* | |
* Only used if $engine == CRYPT_ENGINE_INTERNAL | |
* | |
* @see self::_setup() | |
* @access private | |
* @internal Must be extended by the child Crypt_* class | |
*/ | |
function _setupKey() | |
{ | |
user_error((version_compare(PHP_VERSION, '5.0.0', '>=') ? __METHOD__ : __FUNCTION__) . '() must extend by class ' . get_class($this), E_USER_ERROR); | |
} | |
/** | |
* Setup the CRYPT_ENGINE_INTERNAL $engine | |
* | |
* (re)init, if necessary, the internal cipher $engine and flush all $buffers | |
* Used (only) if $engine == CRYPT_ENGINE_INTERNAL | |
* | |
* _setup() will be called each time if $changed === true | |
* typically this happens when using one or more of following public methods: | |
* | |
* - setKey() | |
* | |
* - setIV() | |
* | |
* - disableContinuousBuffer() | |
* | |
* - First run of encrypt() / decrypt() with no init-settings | |
* | |
* @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() | |
{ | |
$this->_clearBuffers(); | |
$this->_setupKey(); | |
if ($this->use_inline_crypt) { | |
$this->_setupInlineCrypt(); | |
} | |
} | |
/** | |
* Setup the CRYPT_ENGINE_MCRYPT $engine | |
* | |
* (re)init, if necessary, the (ext)mcrypt resources and flush all $buffers | |
* Used (only) if $engine = CRYPT_ENGINE_MCRYPT | |
* | |
* _setupMcrypt() will be called each time if $changed === true | |
* typically this happens when using one or more of following public methods: | |
* | |
* - setKey() | |
* | |
* - setIV() | |
* | |
* - disableContinuousBuffer() | |
* | |
* - First run of encrypt() / decrypt() | |
* | |
* @see self::setKey() | |
* @see self::setIV() | |
* @see self::disableContinuousBuffer() | |
* @access private | |
* @internal Could, but not must, extend by the child Crypt_* class | |
*/ | |
function _setupMcrypt() | |
{ | |
$this->_clearBuffers(); | |
$this->enchanged = $this->dechanged = true; | |
if (!isset($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, | |
); | |
$this->demcrypt = @mcrypt_module_open($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, ''); | |
} | |
} // 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)); | |
} | |
} | |
/** | |
* Pads a string | |
* | |
* Pads a string using the RSA PKCS padding standards so that its length is a multiple of the blocksize. | |
* $this->block_size - (strlen($text) % $this->block_size) bytes are added, each of which is equal to | |
* chr($this->block_size - (strlen($text) % $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 self::_unpad() | |
* @param string $text | |
* @access private | |
* @return string | |
*/ | |
function _pad($text) | |
{ | |
$length = strlen($text); | |
if (!$this->padding) { | |
if ($length % $this->block_size == 0) { | |
return $text; | |
} else { | |
user_error("The plaintext's length ($length) is not a multiple of the block size ({$this->block_size})"); | |
$this->padding = true; | |
} | |
} | |
$pad = $this->block_size - ($length % $this->block_size); | |
return str_pad($text, $length + $pad, chr($pad)); | |
} | |
/** | |
* Unpads a string. | |
* | |
* If padding is enabled and the reported padding length is invalid the encryption key will be assumed to be wrong | |
* and false will be returned. | |
* | |
* @see self::_pad() | |
* @param string $text | |
* @access private | |
* @return string | |
*/ | |
function _unpad($text) | |
{ | |
if (!$this->padding) { | |
return $text; | |
} | |
$length = ord($text[strlen($text) - 1]); | |
if (!$length || $length > $this->block_size) { | |
return false; | |
} | |
return substr($text, 0, -$length); | |
} | |
/** | |
* Clears internal buffers | |
* | |
* Clearing/resetting the internal buffers is done everytime | |
* after disableContinuousBuffer() or on cipher $engine (re)init | |
* ie after setKey() or setIV() | |
* | |
* @access public | |
* @internal Could, but not must, extend by the child Crypt_* class | |
*/ | |
function _clearBuffers() | |
{ | |
$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"); | |
} | |
} | |
/** | |
* String Shift | |
* | |
* Inspired by array_shift | |
* | |
* @param string $string | |
* @param int $index | |
* @access private | |
* @return string | |
*/ | |
function _string_shift(&$string, $index = 1) | |
{ | |
$substr = substr($string, 0, $index); | |
$string = substr($string, $index); | |
return $substr; | |
} | |
/** | |
* String Pop | |
* | |
* Inspired by array_pop | |
* | |
* @param string $string | |
* @param int $index | |
* @access private | |
* @return string | |
*/ | |
function _string_pop(&$string, $index = 1) | |
{ | |
$substr = substr($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; | |
} | |
} | |
$remainder = strlen($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); | |
} | |
/** | |
* Setup the performance-optimized function for de/encrypt() | |
* | |
* Stores the created (or existing) callback function-name | |
* in $this->inline_crypt | |
* | |
* Internally for phpseclib developers: | |
* | |
* _setupInlineCrypt() would be called only if: | |
* | |
* - $engine == CRYPT_ENGINE_INTERNAL and | |
* | |
* - $use_inline_crypt === true | |
* | |
* - each time on _setup(), after(!) _setupKey() | |
* | |
* | |
* This ensures that _setupInlineCrypt() has always a | |
* full ready2go initializated internal cipher $engine state | |
* where, for example, the keys allready expanded, | |
* keys/block_size calculated and such. | |
* | |
* It is, each time if called, the responsibility of _setupInlineCrypt(): | |
* | |
* - to set $this->inline_crypt to a valid and fully working callback function | |
* as a (faster) replacement for encrypt() / decrypt() | |
* | |
* - NOT to create unlimited callback functions (for memory reasons!) | |
* no matter how often _setupInlineCrypt() would be called. At some | |
* point of amount they must be generic re-useable. | |
* | |
* - the code of _setupInlineCrypt() it self, | |
* and the generated callback code, | |
* must be, in following order: | |
* - 100% safe | |
* - 100% compatible to encrypt()/decrypt() | |
* - using only php5+ features/lang-constructs/php-extensions if | |
* compatibility (down to php4) or fallback is provided | |
* - readable/maintainable/understandable/commented and... not-cryptic-styled-code :-) | |
* - >= 10% faster than encrypt()/decrypt() [which is, by the way, | |
* the reason for the existence of _setupInlineCrypt() :-)] | |
* - memory-nice | |
* - 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. | |
* - 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) | |
* - $in (the content of $in has to en/decrypt by the generated code) | |
* - The callback function should not use the 'return' statement, but en/decrypt'ing the content of $in only | |
* | |
* | |
* @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, for any reason, an extending Crypt_Base() 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, | |
// in the constructor at object instance-time | |
// or, if it's runtime-specific, at runtime | |
$this->use_inline_crypt = false; | |
} | |
/** | |
* Creates the performance-optimized function for en/decrypt() | |
* | |
* Internally for phpseclib developers: | |
* | |
* _createInlineCryptFunction(): | |
* | |
* - merge the $cipher_code [setup'ed by _setupInlineCrypt()] | |
* with the current [$this->]mode of operation code | |
* | |
* - create the $inline function, which called by encrypt() / decrypt() | |
* as its replacement to speed up the en/decryption operations. | |
* | |
* - return the name of the created $inline callback function | |
* | |
* - used to speed up en/decryption | |
* | |
* | |
* | |
* The main reason why can speed up things [up to 50%] this way are: | |
* | |
* - using variables more effective then regular. | |
* (ie no use of expensive arrays but integers $k_0, $k_1 ... | |
* or even, for example, the pure $key[] values hardcoded) | |
* | |
* - avoiding 1000's of function calls of ie _encryptBlock() | |
* but inlining the crypt operations. | |
* in the mode of operation for() loop. | |
* | |
* - full loop unroll the (sometimes key-dependent) rounds | |
* avoiding this way ++$i counters and runtime-if's etc... | |
* | |
* The basic code architectur of the generated $inline en/decrypt() | |
* lambda function, in pseudo php, is: | |
* | |
* <code> | |
* +----------------------------------------------------------------------------------------------+ | |
* | callback $inline = create_function: | | |
* | lambda_function_0001_crypt_ECB($action, $text) | | |
* | { | | |
* | INSERT PHP CODE OF: | | |
* | $cipher_code['init_crypt']; // general init code. | | |
* | // ie: $sbox'es declarations used for | | |
* | // encrypt and decrypt'ing. | | |
* | | | |
* | switch ($action) { | | |
* | case 'encrypt': | | |
* | INSERT PHP CODE OF: | | |
* | $cipher_code['init_encrypt']; // encrypt sepcific init code. | | |
* | ie: specified $key or $box | | |
* | declarations for encrypt'ing. | | |
* | | | |
* | foreach ($ciphertext) { | | |
* | $in = $block_size of $ciphertext; | | |
* | | | |
* | INSERT PHP CODE OF: | | |
* | $cipher_code['encrypt_block']; // encrypt's (string) $in, which is always: | | |
* | // strlen($in) == $this->block_size | | |
* | // here comes the cipher algorithm in action | | |
* | // for encryption. | | |
* | // $cipher_code['encrypt_block'] has to | | |
* | // encrypt the content of the $in variable | | |
* | | | |
* | $plaintext .= $in; | | |
* | } | | |
* | return $plaintext; | | |
* | | | |
* | case 'decrypt': | | |
* | INSERT PHP CODE OF: | | |
* | $cipher_code['init_decrypt']; // decrypt sepcific init code | | |
* | ie: specified $key or $box | | |
* | declarations for decrypt'ing. | | |
* | foreach ($plaintext) { | | |
* | $in = $block_size of $plaintext; | | |
* | | | |
* | INSERT PHP CODE OF: | | |
* | $cipher_code['decrypt_block']; // decrypt's (string) $in, which is always | | |
* | // strlen($in) == $this->block_size | | |
* | // here comes the cipher algorithm in action | | |
* | // for decryption. | | |
* | // $cipher_code['decrypt_block'] has to | | |
* | // decrypt the content of the $in variable | | |
* | $ciphertext .= $in; | | |
* | } | | |
* | return $ciphertext; | | |
* | } | | |
* | } | | |
* +----------------------------------------------------------------------------------------------+ | |
* </code> | |
* | |
* See also the Crypt_*::_setupInlineCrypt()'s for | |
* productive inline $cipher_code's how they works. | |
* | |
* Structure of: | |
* <code> | |
* $cipher_code = array( | |
* 'init_crypt' => (string) '', // optional | |
* 'init_encrypt' => (string) '', // optional | |
* 'init_decrypt' => (string) '', // optional | |
* 'encrypt_block' => (string) '', // required | |
* 'decrypt_block' => (string) '' // required | |
* ); | |
* </code> | |
* | |
* @see self::_setupInlineCrypt() | |
* @see self::encrypt() | |
* @see self::decrypt() | |
* @param array $cipher_code | |
* @access private | |
* @return string (the name of the created callback function) | |
*/ | |
function _createInlineCryptFunction($cipher_code) | |
{ | |
$block_size = $this->block_size; | |
// optional | |
$init_crypt = isset($cipher_code['init_crypt']) ? $cipher_code['init_crypt'] : ''; | |
$init_encrypt = isset($cipher_code['init_encrypt']) ? $cipher_code['init_encrypt'] : ''; | |
$init_decrypt = isset($cipher_code['init_decrypt']) ? $cipher_code['init_decrypt'] : ''; | |
// required | |
$encrypt_block = $cipher_code['encrypt_block']; | |
$decrypt_block = $cipher_code['decrypt_block']; | |
// Generating mode of operation inline code, | |
// merged with the $cipher_code algorithm | |
// for encrypt- and decryption. | |
switch ($this->mode) { | |
case CRYPT_MODE_ECB: | |
$encrypt = $init_encrypt . ' | |
$_ciphertext = ""; | |
$_plaintext_len = strlen($_text); | |
for ($_i = 0; $_i < $_plaintext_len; $_i+= '.$block_size.') { | |
$in = substr($_text, $_i, '.$block_size.'); | |
'.$encrypt_block.' | |
$_ciphertext.= $in; | |
} | |
return $_ciphertext; | |
'; | |
$decrypt = $init_decrypt . ' | |
$_plaintext = ""; | |
$_text = str_pad($_text, strlen($_text) + ('.$block_size.' - strlen($_text) % '.$block_size.') % '.$block_size.', chr(0)); | |
$_ciphertext_len = strlen($_text); | |
for ($_i = 0; $_i < $_ciphertext_len; $_i+= '.$block_size.') { | |
$in = substr($_text, $_i, '.$block_size.'); | |
'.$decrypt_block.' | |
$_plaintext.= $in; | |
} | |
return $self->_unpad($_plaintext); | |
'; | |
break; | |
case CRYPT_MODE_CTR: | |
$encrypt = $init_encrypt . ' | |
$_ciphertext = ""; | |
$_plaintext_len = strlen($_text); | |
$_xor = $self->encryptIV; | |
$_buffer = &$self->enbuffer; | |
if (strlen($_buffer["ciphertext"])) { | |
for ($_i = 0; $_i < $_plaintext_len; $_i+= '.$block_size.') { | |
$_block = substr($_text, $_i, '.$block_size.'); | |
if (strlen($_block) > strlen($_buffer["ciphertext"])) { | |
$in = $_xor; | |
'.$encrypt_block.' | |
$self->_increment_str($_xor); | |
$_buffer["ciphertext"].= $in; | |
} | |
$_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 = $_xor; | |
'.$encrypt_block.' | |
$self->_increment_str($_xor); | |
$_key = $in; | |
$_ciphertext.= $_block ^ $_key; | |
} | |
} | |
if ($self->continuousBuffer) { | |
$self->encryptIV = $_xor; | |
if ($_start = $_plaintext_len % '.$block_size.') { | |
$_buffer["ciphertext"] = substr($_key, $_start) . $_buffer["ciphertext"]; | |
} | |
} | |
return $_ciphertext; | |
'; | |
$decrypt = $init_encrypt . ' | |
$_plaintext = ""; | |
$_ciphertext_len = strlen($_text); | |
$_xor = $self->decryptIV; | |
$_buffer = &$self->debuffer; | |
if (strlen($_buffer["ciphertext"])) { | |
for ($_i = 0; $_i < $_ciphertext_len; $_i+= '.$block_size.') { | |
$_block = substr($_text, $_i, '.$block_size.'); | |
if (strlen($_block) > strlen($_buffer["ciphertext"])) { | |
$in = $_xor; | |
'.$encrypt_block.' | |
$self->_increment_str($_xor); | |
$_buffer["ciphertext"].= $in; | |
} | |
$_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 = $_xor; | |
'.$encrypt_block.' | |
$self->_increment_str($_xor); | |
$_key = $in; | |
$_plaintext.= $_block ^ $_key; | |
} | |
} | |
if ($self->continuousBuffer) { | |
$self->decryptIV = $_xor; | |
if ($_start = $_ciphertext_len % '.$block_size.') { | |
$_buffer["ciphertext"] = substr($_key, $_start) . $_buffer["ciphertext"]; | |
} | |
} | |
return $_plaintext; | |
'; | |
break; | |
case CRYPT_MODE_CFB: | |
$encrypt = $init_encrypt . ' | |
$_ciphertext = ""; | |
$_buffer = &$self->enbuffer; | |
if ($self->continuousBuffer) { | |
$_iv = &$self->encryptIV; | |
$_pos = &$_buffer["pos"]; | |
} else { | |
$_iv = $self->encryptIV; | |
$_pos = 0; | |
} | |
$_len = strlen($_text); | |
$_i = 0; | |
if ($_pos) { | |
$_orig_pos = $_pos; | |
$_max = '.$block_size.' - $_pos; | |
if ($_len >= $_max) { | |
$_i = $_max; | |
$_len-= $_max; | |
$_pos = 0; | |
} else { | |
$_i = $_len; | |
$_pos+= $_len; | |
$_len = 0; | |
} | |
$_ciphertext = substr($_iv, $_orig_pos) ^ $_text; | |
$_iv = substr_replace($_iv, $_ciphertext, $_orig_pos, $_i); | |
} | |
while ($_len >= '.$block_size.') { | |
$in = $_iv; | |
'.$encrypt_block.'; | |
$_iv = $in ^ substr($_text, $_i, '.$block_size.'); | |
$_ciphertext.= $_iv; | |
$_len-= '.$block_size.'; | |
$_i+= '.$block_size.'; | |
} | |
if ($_len) { | |
$in = $_iv; | |
'.$encrypt_block.' | |
$_iv = $in; | |
$_block = $_iv ^ substr($_text, $_i); | |
$_iv = substr_replace($_iv, $_block, 0, $_len); | |
$_ciphertext.= $_block; | |
$_pos = $_len; | |
} | |
return $_ciphertext; | |
'; | |
$decrypt = $init_encrypt . ' | |
$_plaintext = ""; | |
$_buffer = &$self->debuffer; | |
if ($self->continuousBuffer) { | |
$_iv = &$self->decryptIV; | |
$_pos = &$_buffer["pos"]; | |
} else { | |
$_iv = $self->decryptIV; | |
$_pos = 0; | |
} | |
$_len = strlen($_text); | |
$_i = 0; | |
if ($_pos) { | |
$_orig_pos = $_pos; | |
$_max = '.$block_size.' - $_pos; | |
if ($_len >= $_max) { | |
$_i = $_max; | |
$_len-= $_max; | |
$_pos = 0; | |
} else { | |
$_i = $_len; | |
$_pos+= $_len; | |
$_len = 0; | |
} | |
$_plaintext = substr($_iv, $_orig_pos) ^ $_text; | |
$_iv = substr_replace($_iv, substr($_text, 0, $_i), $_orig_pos, $_i); | |
} | |
while ($_len >= '.$block_size.') { | |
$in = $_iv; | |
'.$encrypt_block.' | |
$_iv = $in; | |
$cb = substr($_text, $_i, '.$block_size.'); | |
$_plaintext.= $_iv ^ $cb; | |
$_iv = $cb; | |
$_len-= '.$block_size.'; | |
$_i+= '.$block_size.'; | |
} | |
if ($_len) { | |
$in = $_iv; | |
'.$encrypt_block.' | |
$_iv = $in; | |
$_plaintext.= $_iv ^ substr($_text, $_i); | |
$_iv = substr_replace($_iv, substr($_text, $_i), 0, $_len); | |
$_pos = $_len; | |
} | |
return $_plaintext; | |
'; | |
break; | |
case CRYPT_MODE_OFB: | |
$encrypt = $init_encrypt . ' | |
$_ciphertext = ""; | |
$_plaintext_len = strlen($_text); | |
$_xor = $self->encryptIV; | |
$_buffer = &$self->enbuffer; | |
if (strlen($_buffer["xor"])) { | |
for ($_i = 0; $_i < $_plaintext_len; $_i+= '.$block_size.') { | |
$_block = substr($_text, $_i, '.$block_size.'); | |
if (strlen($_block) > strlen($_buffer["xor"])) { | |
$in = $_xor; | |
'.$encrypt_block.' | |
$_xor = $in; | |
$_buffer["xor"].= $_xor; | |
} | |
$_key = $self->_string_shift($_buffer["xor"], '.$block_size.'); | |
$_ciphertext.= $_block ^ $_key; | |
} | |
} else { | |
for ($_i = 0; $_i < $_plaintext_len; $_i+= '.$block_size.') { | |
$in = $_xor; | |
'.$encrypt_block.' | |
$_xor = $in; | |
$_ciphertext.= substr($_text, $_i, '.$block_size.') ^ $_xor; | |
} | |
$_key = $_xor; | |
} | |
if ($self->continuousBuffer) { | |
$self->encryptIV = $_xor; | |
if ($_start = $_plaintext_len % '.$block_size.') { | |
$_buffer["xor"] = substr($_key, $_start) . $_buffer["xor"]; | |
} | |
} | |
return $_ciphertext; | |
'; | |
$decrypt = $init_encrypt . ' | |
$_plaintext = ""; | |
$_ciphertext_len = strlen($_text); | |
$_xor = $self->decryptIV; | |
$_buffer = &$self->debuffer; | |
if (strlen($_buffer["xor"])) { | |
for ($_i = 0; $_i < $_ciphertext_len; $_i+= '.$block_size.') { | |
$_block = substr($_text, $_i, '.$block_size.'); | |
if (strlen($_block) > strlen($_buffer["xor"])) { | |
$in = $_xor; | |
'.$encrypt_block.' | |
$_xor = $in; | |
$_buffer["xor"].= $_xor; | |
} | |
$_key = $self->_string_shift($_buffer["xor"], '.$block_size.'); | |
$_plaintext.= $_block ^ $_key; | |
} | |
} else { | |
for ($_i = 0; $_i < $_ciphertext_len; $_i+= '.$block_size.') { | |
$in = $_xor; | |
'.$encrypt_block.' | |
$_xor = $in; | |
$_plaintext.= substr($_text, $_i, '.$block_size.') ^ $_xor; | |
} | |
$_key = $_xor; | |
} | |
if ($self->continuousBuffer) { | |
$self->decryptIV = $_xor; | |
if ($_start = $_ciphertext_len % '.$block_size.') { | |
$_buffer["xor"] = substr($_key, $_start) . $_buffer["xor"]; | |
} | |
} | |
return $_plaintext; | |
'; | |
break; | |
case CRYPT_MODE_STREAM: | |
$encrypt = $init_encrypt . ' | |
$_ciphertext = ""; | |
'.$encrypt_block.' | |
return $_ciphertext; | |
'; | |
$decrypt = $init_decrypt . ' | |
$_plaintext = ""; | |
'.$decrypt_block.' | |
return $_plaintext; | |
'; | |
break; | |
// case CRYPT_MODE_CBC: | |
default: | |
$encrypt = $init_encrypt . ' | |
$_ciphertext = ""; | |
$_plaintext_len = strlen($_text); | |
$in = $self->encryptIV; | |
for ($_i = 0; $_i < $_plaintext_len; $_i+= '.$block_size.') { | |
$in = substr($_text, $_i, '.$block_size.') ^ $in; | |
'.$encrypt_block.' | |
$_ciphertext.= $in; | |
} | |
if ($self->continuousBuffer) { | |
$self->encryptIV = $in; | |
} | |
return $_ciphertext; | |
'; | |
$decrypt = $init_decrypt . ' | |
$_plaintext = ""; | |
$_text = str_pad($_text, strlen($_text) + ('.$block_size.' - strlen($_text) % '.$block_size.') % '.$block_size.', chr(0)); | |
$_ciphertext_len = strlen($_text); | |
$_iv = $self->decryptIV; | |
for ($_i = 0; $_i < $_ciphertext_len; $_i+= '.$block_size.') { | |
$in = $_block = substr($_text, $_i, '.$block_size.'); | |
'.$decrypt_block.' | |
$_plaintext.= $in ^ $_iv; | |
$_iv = $_block; | |
} | |
if ($self->continuousBuffer) { | |
$self->decryptIV = $_iv; | |
} | |
return $self->_unpad($_plaintext); | |
'; | |
break; | |
} | |
// Create the $inline function and return its name as string. Ready to run! | |
return create_function('$_action, &$self, $_text', $init_crypt . 'if ($_action == "encrypt") { ' . $encrypt . ' } else { ' . $decrypt . ' }'); | |
} | |
/** | |
* Holds the lambda_functions table (classwide) | |
* | |
* Each name of the lambda function, created from | |
* _setupInlineCrypt() && _createInlineCryptFunction() | |
* is stored, classwide (!), here for reusing. | |
* | |
* The string-based index of $function is a classwide | |
* unique value representing, at least, the $mode of | |
* operation (or more... depends of the optimizing level) | |
* for which $mode the lambda function was created. | |
* | |
* @access private | |
* @return array &$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 (!defined('CRYPT_BASE_WHIRLPOOL_AVAILABLE')) { | |
define('CRYPT_BASE_WHIRLPOOL_AVAILABLE', (bool)(extension_loaded('hash') && in_array('whirlpool', hash_algos()))); | |
} | |
$result = ''; | |
$hash = $bytes; | |
switch (true) { | |
case CRYPT_BASE_WHIRLPOOL_AVAILABLE: | |
foreach (str_split($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)); | |
} | |
} | |
} |