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Diffstat (limited to 'platform/www/vendor/phpseclib/phpseclib/phpseclib/Crypt/TripleDES.php')
| -rw-r--r-- | platform/www/vendor/phpseclib/phpseclib/phpseclib/Crypt/TripleDES.php | 460 |
1 files changed, 460 insertions, 0 deletions
diff --git a/platform/www/vendor/phpseclib/phpseclib/phpseclib/Crypt/TripleDES.php b/platform/www/vendor/phpseclib/phpseclib/phpseclib/Crypt/TripleDES.php new file mode 100644 index 0000000..a2c4166 --- /dev/null +++ b/platform/www/vendor/phpseclib/phpseclib/phpseclib/Crypt/TripleDES.php @@ -0,0 +1,460 @@ +<?php + +/** + * Pure-PHP implementation of Triple DES. + * + * Uses mcrypt, if available, and an internal implementation, otherwise. Operates in the EDE3 mode (encrypt-decrypt-encrypt). + * + * PHP version 5 + * + * Here's a short example of how to use this library: + * <code> + * <?php + * include 'vendor/autoload.php'; + * + * $des = new \phpseclib\Crypt\TripleDES(); + * + * $des->setKey('abcdefghijklmnopqrstuvwx'); + * + * $size = 10 * 1024; + * $plaintext = ''; + * for ($i = 0; $i < $size; $i++) { + * $plaintext.= 'a'; + * } + * + * echo $des->decrypt($des->encrypt($plaintext)); + * ?> + * </code> + * + * @category Crypt + * @package TripleDES + * @author Jim Wigginton <terrafrost@php.net> + * @copyright 2007 Jim Wigginton + * @license http://www.opensource.org/licenses/mit-license.html MIT License + * @link http://phpseclib.sourceforge.net + */ + +namespace phpseclib\Crypt; + +/** + * Pure-PHP implementation of Triple DES. + * + * @package TripleDES + * @author Jim Wigginton <terrafrost@php.net> + * @access public + */ +class TripleDES extends DES +{ + /** + * Encrypt / decrypt using inner chaining + * + * Inner chaining is used by SSH-1 and is generally considered to be less secure then outer chaining (self::MODE_CBC3). + */ + const MODE_3CBC = -2; + + /** + * Encrypt / decrypt using outer chaining + * + * Outer chaining is used by SSH-2 and when the mode is set to \phpseclib\Crypt\Base::MODE_CBC. + */ + const MODE_CBC3 = Base::MODE_CBC; + + /** + * Key Length (in bytes) + * + * @see \phpseclib\Crypt\TripleDES::setKeyLength() + * @var int + * @access private + */ + var $key_length = 24; + + /** + * The default salt used by setPassword() + * + * @see \phpseclib\Crypt\Base::password_default_salt + * @see \phpseclib\Crypt\Base::setPassword() + * @var string + * @access private + */ + var $password_default_salt = 'phpseclib'; + + /** + * The mcrypt specific name of the cipher + * + * @see \phpseclib\Crypt\DES::cipher_name_mcrypt + * @see \phpseclib\Crypt\Base::cipher_name_mcrypt + * @var string + * @access private + */ + var $cipher_name_mcrypt = 'tripledes'; + + /** + * Optimizing value while CFB-encrypting + * + * @see \phpseclib\Crypt\Base::cfb_init_len + * @var int + * @access private + */ + var $cfb_init_len = 750; + + /** + * max possible size of $key + * + * @see self::setKey() + * @see \phpseclib\Crypt\DES::setKey() + * @var string + * @access private + */ + var $key_length_max = 24; + + /** + * Internal flag whether using self::MODE_3CBC or not + * + * @var bool + * @access private + */ + var $mode_3cbc; + + /** + * The \phpseclib\Crypt\DES objects + * + * Used only if $mode_3cbc === true + * + * @var array + * @access private + */ + var $des; + + /** + * Default Constructor. + * + * Determines whether or not the mcrypt extension should be used. + * + * $mode could be: + * + * - \phpseclib\Crypt\Base::MODE_ECB + * + * - \phpseclib\Crypt\Base::MODE_CBC + * + * - \phpseclib\Crypt\Base::MODE_CTR + * + * - \phpseclib\Crypt\Base::MODE_CFB + * + * - \phpseclib\Crypt\Base::MODE_OFB + * + * - \phpseclib\Crypt\TripleDES::MODE_3CBC + * + * If not explicitly set, \phpseclib\Crypt\Base::MODE_CBC will be used. + * + * @see \phpseclib\Crypt\DES::__construct() + * @see \phpseclib\Crypt\Base::__construct() + * @param int $mode + * @access public + */ + function __construct($mode = Base::MODE_CBC) + { + switch ($mode) { + // In case of self::MODE_3CBC, we init as CRYPT_DES_MODE_CBC + // and additional flag us internally as 3CBC + case self::MODE_3CBC: + parent::__construct(Base::MODE_CBC); + $this->mode_3cbc = true; + + // This three $des'es will do the 3CBC work (if $key > 64bits) + $this->des = array( + new DES(Base::MODE_CBC), + new DES(Base::MODE_CBC), + new DES(Base::MODE_CBC), + ); + + // we're going to be doing the padding, ourselves, so disable it in the \phpseclib\Crypt\DES objects + $this->des[0]->disablePadding(); + $this->des[1]->disablePadding(); + $this->des[2]->disablePadding(); + break; + // If not 3CBC, we init as usual + default: + parent::__construct($mode); + } + } + + /** + * Test for engine validity + * + * This is mainly just a wrapper to set things up for \phpseclib\Crypt\Base::isValidEngine() + * + * @see \phpseclib\Crypt\Base::__construct() + * @param int $engine + * @access public + * @return bool + */ + function isValidEngine($engine) + { + if ($engine == self::ENGINE_OPENSSL) { + $this->cipher_name_openssl_ecb = 'des-ede3'; + $mode = $this->_openssl_translate_mode(); + $this->cipher_name_openssl = $mode == 'ecb' ? 'des-ede3' : 'des-ede3-' . $mode; + } + + return parent::isValidEngine($engine); + } + + /** + * Sets the initialization vector. (optional) + * + * SetIV is not required when \phpseclib\Crypt\Base::MODE_ECB is being used. If not explicitly set, it'll be assumed + * to be all zero's. + * + * @see \phpseclib\Crypt\Base::setIV() + * @access public + * @param string $iv + */ + function setIV($iv) + { + parent::setIV($iv); + if ($this->mode_3cbc) { + $this->des[0]->setIV($iv); + $this->des[1]->setIV($iv); + $this->des[2]->setIV($iv); + } + } + + /** + * Sets the key length. + * + * Valid key lengths are 64, 128 and 192 + * + * @see \phpseclib\Crypt\Base:setKeyLength() + * @access public + * @param int $length + */ + function setKeyLength($length) + { + $length >>= 3; + switch (true) { + case $length <= 8: + $this->key_length = 8; + break; + case $length <= 16: + $this->key_length = 16; + break; + default: + $this->key_length = 24; + } + + parent::setKeyLength($length); + } + + /** + * Sets the key. + * + * Keys can be of any length. Triple DES, itself, can use 128-bit (eg. strlen($key) == 16) or + * 192-bit (eg. strlen($key) == 24) keys. This function pads and truncates $key as appropriate. + * + * DES also requires that every eighth bit be a parity bit, however, we'll ignore that. + * + * If the key is not explicitly set, it'll be assumed to be all null bytes. + * + * @access public + * @see \phpseclib\Crypt\DES::setKey() + * @see \phpseclib\Crypt\Base::setKey() + * @param string $key + */ + function setKey($key) + { + $length = $this->explicit_key_length ? $this->key_length : strlen($key); + if ($length > 8) { + $key = str_pad(substr($key, 0, 24), 24, chr(0)); + // if $key is between 64 and 128-bits, use the first 64-bits as the last, per this: + // http://php.net/function.mcrypt-encrypt#47973 + $key = $length <= 16 ? substr_replace($key, substr($key, 0, 8), 16) : substr($key, 0, 24); + } else { + $key = str_pad($key, 8, chr(0)); + } + parent::setKey($key); + + // And in case of self::MODE_3CBC: + // if key <= 64bits we not need the 3 $des to work, + // because we will then act as regular DES-CBC with just a <= 64bit key. + // So only if the key > 64bits (> 8 bytes) we will call setKey() for the 3 $des. + if ($this->mode_3cbc && $length > 8) { + $this->des[0]->setKey(substr($key, 0, 8)); + $this->des[1]->setKey(substr($key, 8, 8)); + $this->des[2]->setKey(substr($key, 16, 8)); + } + } + + /** + * Encrypts a message. + * + * @see \phpseclib\Crypt\Base::encrypt() + * @access public + * @param string $plaintext + * @return string $cipertext + */ + function encrypt($plaintext) + { + // parent::en/decrypt() is able to do all the work for all modes and keylengths, + // except for: self::MODE_3CBC (inner chaining CBC) with a key > 64bits + + // if the key is smaller then 8, do what we'd normally do + if ($this->mode_3cbc && strlen($this->key) > 8) { + return $this->des[2]->encrypt( + $this->des[1]->decrypt( + $this->des[0]->encrypt( + $this->_pad($plaintext) + ) + ) + ); + } + + return parent::encrypt($plaintext); + } + + /** + * Decrypts a message. + * + * @see \phpseclib\Crypt\Base::decrypt() + * @access public + * @param string $ciphertext + * @return string $plaintext + */ + function decrypt($ciphertext) + { + if ($this->mode_3cbc && strlen($this->key) > 8) { + return $this->_unpad( + $this->des[0]->decrypt( + $this->des[1]->encrypt( + $this->des[2]->decrypt( + str_pad($ciphertext, (strlen($ciphertext) + 7) & 0xFFFFFFF8, "\0") + ) + ) + ) + ); + } + + return parent::decrypt($ciphertext); + } + + /** + * Treat consecutive "packets" as if they are a continuous buffer. + * + * Say you have a 16-byte plaintext $plaintext. Using the default behavior, the two following code snippets + * will yield different outputs: + * + * <code> + * echo $des->encrypt(substr($plaintext, 0, 8)); + * echo $des->encrypt(substr($plaintext, 8, 8)); + * </code> + * <code> + * echo $des->encrypt($plaintext); + * </code> + * + * The solution is to enable the continuous buffer. Although this will resolve the above discrepancy, it creates + * another, as demonstrated with the following: + * + * <code> + * $des->encrypt(substr($plaintext, 0, 8)); + * echo $des->decrypt($des->encrypt(substr($plaintext, 8, 8))); + * </code> + * <code> + * echo $des->decrypt($des->encrypt(substr($plaintext, 8, 8))); + * </code> + * + * With the continuous buffer disabled, these would yield the same output. With it enabled, they yield different + * outputs. The reason is due to the fact that the initialization vector's change after every encryption / + * decryption round when the continuous buffer is enabled. When it's disabled, they remain constant. + * + * Put another way, when the continuous buffer is enabled, the state of the \phpseclib\Crypt\DES() object changes after each + * encryption / decryption round, whereas otherwise, it'd remain constant. For this reason, it's recommended that + * continuous buffers not be used. They do offer better security and are, in fact, sometimes required (SSH uses them), + * however, they are also less intuitive and more likely to cause you problems. + * + * @see \phpseclib\Crypt\Base::enableContinuousBuffer() + * @see self::disableContinuousBuffer() + * @access public + */ + function enableContinuousBuffer() + { + parent::enableContinuousBuffer(); + if ($this->mode_3cbc) { + $this->des[0]->enableContinuousBuffer(); + $this->des[1]->enableContinuousBuffer(); + $this->des[2]->enableContinuousBuffer(); + } + } + + /** + * Treat consecutive packets as if they are a discontinuous buffer. + * + * The default behavior. + * + * @see \phpseclib\Crypt\Base::disableContinuousBuffer() + * @see self::enableContinuousBuffer() + * @access public + */ + function disableContinuousBuffer() + { + parent::disableContinuousBuffer(); + if ($this->mode_3cbc) { + $this->des[0]->disableContinuousBuffer(); + $this->des[1]->disableContinuousBuffer(); + $this->des[2]->disableContinuousBuffer(); + } + } + + /** + * Creates the key schedule + * + * @see \phpseclib\Crypt\DES::_setupKey() + * @see \phpseclib\Crypt\Base::_setupKey() + * @access private + */ + function _setupKey() + { + switch (true) { + // if $key <= 64bits we configure our internal pure-php cipher engine + // to act as regular [1]DES, not as 3DES. mcrypt.so::tripledes does the same. + case strlen($this->key) <= 8: + $this->des_rounds = 1; + break; + + // otherwise, if $key > 64bits, we configure our engine to work as 3DES. + default: + $this->des_rounds = 3; + + // (only) if 3CBC is used we have, of course, to setup the $des[0-2] keys also separately. + if ($this->mode_3cbc) { + $this->des[0]->_setupKey(); + $this->des[1]->_setupKey(); + $this->des[2]->_setupKey(); + + // because $des[0-2] will, now, do all the work we can return here + // not need unnecessary stress parent::_setupKey() with our, now unused, $key. + return; + } + } + // setup our key + parent::_setupKey(); + } + + /** + * Sets the internal crypt engine + * + * @see \phpseclib\Crypt\Base::__construct() + * @see \phpseclib\Crypt\Base::setPreferredEngine() + * @param int $engine + * @access public + * @return int + */ + function setPreferredEngine($engine) + { + if ($this->mode_3cbc) { + $this->des[0]->setPreferredEngine($engine); + $this->des[1]->setPreferredEngine($engine); + $this->des[2]->setPreferredEngine($engine); + } + + return parent::setPreferredEngine($engine); + } +} |