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Diffstat (limited to 'libs/phpseclib-1.0.4/phpseclib/Crypt/Base.php')
| -rw-r--r-- | libs/phpseclib-1.0.4/phpseclib/Crypt/Base.php | 2611 |
1 files changed, 0 insertions, 2611 deletions
diff --git a/libs/phpseclib-1.0.4/phpseclib/Crypt/Base.php b/libs/phpseclib-1.0.4/phpseclib/Crypt/Base.php deleted file mode 100644 index 91ebe59..0000000 --- a/libs/phpseclib-1.0.4/phpseclib/Crypt/Base.php +++ /dev/null @@ -1,2611 +0,0 @@ -<?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)); - } - } -} |