0byt3m1n1
Path:
/
home
/
mgatv524
/
www
/
edurocha
/
vendor
/
phpseclib
/
phpseclib
/
phpseclib
/
Crypt
/
[
Home
]
File: RC2.php
<?php /** * Pure-PHP implementation of RC2. * * Uses mcrypt, if available, and an internal implementation, otherwise. * * PHP version 5 * * Useful resources are as follows: * * - {@link http://tools.ietf.org/html/rfc2268} * * Here's a short example of how to use this library: * <code> * <?php * include 'vendor/autoload.php'; * * $rc2 = new \phpseclib\Crypt\RC2(); * * $rc2->setKey('abcdefgh'); * * $plaintext = str_repeat('a', 1024); * * echo $rc2->decrypt($rc2->encrypt($plaintext)); * ?> * </code> * * @category Crypt * @package RC2 * @author Patrick Monnerat <pm@datasphere.ch> * @license http://www.opensource.org/licenses/mit-license.html MIT License * @link http://phpseclib.sourceforge.net */ namespace phpseclib\Crypt; /** * Pure-PHP implementation of RC2. * * @package RC2 * @access public */ class RC2 extends Base { /** * Block Length of the cipher * * @see \phpseclib\Crypt\Base::block_size * @var int * @access private */ var $block_size = 8; /** * The Key * * @see \phpseclib\Crypt\Base::key * @see self::setKey() * @var string * @access private */ var $key; /** * The Original (unpadded) Key * * @see \phpseclib\Crypt\Base::key * @see self::setKey() * @see self::encrypt() * @see self::decrypt() * @var string * @access private */ var $orig_key; /** * Don't truncate / null pad key * * @see \phpseclib\Crypt\Base::_clearBuffers() * @var bool * @access private */ var $skip_key_adjustment = true; /** * Key Length (in bytes) * * @see \phpseclib\Crypt\RC2::setKeyLength() * @var int * @access private */ var $key_length = 16; // = 128 bits /** * The mcrypt specific name of the cipher * * @see \phpseclib\Crypt\Base::cipher_name_mcrypt * @var string * @access private */ var $cipher_name_mcrypt = 'rc2'; /** * Optimizing value while CFB-encrypting * * @see \phpseclib\Crypt\Base::cfb_init_len * @var int * @access private */ var $cfb_init_len = 500; /** * The key length in bits. * * @see self::setKeyLength() * @see self::setKey() * @var int * @access private * @internal Should be in range [1..1024]. * @internal Changing this value after setting the key has no effect. */ var $default_key_length = 1024; /** * The key length in bits. * * @see self::isValidEnine() * @see self::setKey() * @var int * @access private * @internal Should be in range [1..1024]. */ var $current_key_length; /** * The Key Schedule * * @see self::_setupKey() * @var array * @access private */ var $keys; /** * Key expansion randomization table. * Twice the same 256-value sequence to save a modulus in key expansion. * * @see self::setKey() * @var array * @access private */ var $pitable = array( 0xD9, 0x78, 0xF9, 0xC4, 0x19, 0xDD, 0xB5, 0xED, 0x28, 0xE9, 0xFD, 0x79, 0x4A, 0xA0, 0xD8, 0x9D, 0xC6, 0x7E, 0x37, 0x83, 0x2B, 0x76, 0x53, 0x8E, 0x62, 0x4C, 0x64, 0x88, 0x44, 0x8B, 0xFB, 0xA2, 0x17, 0x9A, 0x59, 0xF5, 0x87, 0xB3, 0x4F, 0x13, 0x61, 0x45, 0x6D, 0x8D, 0x09, 0x81, 0x7D, 0x32, 0xBD, 0x8F, 0x40, 0xEB, 0x86, 0xB7, 0x7B, 0x0B, 0xF0, 0x95, 0x21, 0x22, 0x5C, 0x6B, 0x4E, 0x82, 0x54, 0xD6, 0x65, 0x93, 0xCE, 0x60, 0xB2, 0x1C, 0x73, 0x56, 0xC0, 0x14, 0xA7, 0x8C, 0xF1, 0xDC, 0x12, 0x75, 0xCA, 0x1F, 0x3B, 0xBE, 0xE4, 0xD1, 0x42, 0x3D, 0xD4, 0x30, 0xA3, 0x3C, 0xB6, 0x26, 0x6F, 0xBF, 0x0E, 0xDA, 0x46, 0x69, 0x07, 0x57, 0x27, 0xF2, 0x1D, 0x9B, 0xBC, 0x94, 0x43, 0x03, 0xF8, 0x11, 0xC7, 0xF6, 0x90, 0xEF, 0x3E, 0xE7, 0x06, 0xC3, 0xD5, 0x2F, 0xC8, 0x66, 0x1E, 0xD7, 0x08, 0xE8, 0xEA, 0xDE, 0x80, 0x52, 0xEE, 0xF7, 0x84, 0xAA, 0x72, 0xAC, 0x35, 0x4D, 0x6A, 0x2A, 0x96, 0x1A, 0xD2, 0x71, 0x5A, 0x15, 0x49, 0x74, 0x4B, 0x9F, 0xD0, 0x5E, 0x04, 0x18, 0xA4, 0xEC, 0xC2, 0xE0, 0x41, 0x6E, 0x0F, 0x51, 0xCB, 0xCC, 0x24, 0x91, 0xAF, 0x50, 0xA1, 0xF4, 0x70, 0x39, 0x99, 0x7C, 0x3A, 0x85, 0x23, 0xB8, 0xB4, 0x7A, 0xFC, 0x02, 0x36, 0x5B, 0x25, 0x55, 0x97, 0x31, 0x2D, 0x5D, 0xFA, 0x98, 0xE3, 0x8A, 0x92, 0xAE, 0x05, 0xDF, 0x29, 0x10, 0x67, 0x6C, 0xBA, 0xC9, 0xD3, 0x00, 0xE6, 0xCF, 0xE1, 0x9E, 0xA8, 0x2C, 0x63, 0x16, 0x01, 0x3F, 0x58, 0xE2, 0x89, 0xA9, 0x0D, 0x38, 0x34, 0x1B, 0xAB, 0x33, 0xFF, 0xB0, 0xBB, 0x48, 0x0C, 0x5F, 0xB9, 0xB1, 0xCD, 0x2E, 0xC5, 0xF3, 0xDB, 0x47, 0xE5, 0xA5, 0x9C, 0x77, 0x0A, 0xA6, 0x20, 0x68, 0xFE, 0x7F, 0xC1, 0xAD, 0xD9, 0x78, 0xF9, 0xC4, 0x19, 0xDD, 0xB5, 0xED, 0x28, 0xE9, 0xFD, 0x79, 0x4A, 0xA0, 0xD8, 0x9D, 0xC6, 0x7E, 0x37, 0x83, 0x2B, 0x76, 0x53, 0x8E, 0x62, 0x4C, 0x64, 0x88, 0x44, 0x8B, 0xFB, 0xA2, 0x17, 0x9A, 0x59, 0xF5, 0x87, 0xB3, 0x4F, 0x13, 0x61, 0x45, 0x6D, 0x8D, 0x09, 0x81, 0x7D, 0x32, 0xBD, 0x8F, 0x40, 0xEB, 0x86, 0xB7, 0x7B, 0x0B, 0xF0, 0x95, 0x21, 0x22, 0x5C, 0x6B, 0x4E, 0x82, 0x54, 0xD6, 0x65, 0x93, 0xCE, 0x60, 0xB2, 0x1C, 0x73, 0x56, 0xC0, 0x14, 0xA7, 0x8C, 0xF1, 0xDC, 0x12, 0x75, 0xCA, 0x1F, 0x3B, 0xBE, 0xE4, 0xD1, 0x42, 0x3D, 0xD4, 0x30, 0xA3, 0x3C, 0xB6, 0x26, 0x6F, 0xBF, 0x0E, 0xDA, 0x46, 0x69, 0x07, 0x57, 0x27, 0xF2, 0x1D, 0x9B, 0xBC, 0x94, 0x43, 0x03, 0xF8, 0x11, 0xC7, 0xF6, 0x90, 0xEF, 0x3E, 0xE7, 0x06, 0xC3, 0xD5, 0x2F, 0xC8, 0x66, 0x1E, 0xD7, 0x08, 0xE8, 0xEA, 0xDE, 0x80, 0x52, 0xEE, 0xF7, 0x84, 0xAA, 0x72, 0xAC, 0x35, 0x4D, 0x6A, 0x2A, 0x96, 0x1A, 0xD2, 0x71, 0x5A, 0x15, 0x49, 0x74, 0x4B, 0x9F, 0xD0, 0x5E, 0x04, 0x18, 0xA4, 0xEC, 0xC2, 0xE0, 0x41, 0x6E, 0x0F, 0x51, 0xCB, 0xCC, 0x24, 0x91, 0xAF, 0x50, 0xA1, 0xF4, 0x70, 0x39, 0x99, 0x7C, 0x3A, 0x85, 0x23, 0xB8, 0xB4, 0x7A, 0xFC, 0x02, 0x36, 0x5B, 0x25, 0x55, 0x97, 0x31, 0x2D, 0x5D, 0xFA, 0x98, 0xE3, 0x8A, 0x92, 0xAE, 0x05, 0xDF, 0x29, 0x10, 0x67, 0x6C, 0xBA, 0xC9, 0xD3, 0x00, 0xE6, 0xCF, 0xE1, 0x9E, 0xA8, 0x2C, 0x63, 0x16, 0x01, 0x3F, 0x58, 0xE2, 0x89, 0xA9, 0x0D, 0x38, 0x34, 0x1B, 0xAB, 0x33, 0xFF, 0xB0, 0xBB, 0x48, 0x0C, 0x5F, 0xB9, 0xB1, 0xCD, 0x2E, 0xC5, 0xF3, 0xDB, 0x47, 0xE5, 0xA5, 0x9C, 0x77, 0x0A, 0xA6, 0x20, 0x68, 0xFE, 0x7F, 0xC1, 0xAD ); /** * Inverse key expansion randomization table. * * @see self::setKey() * @var array * @access private */ var $invpitable = array( 0xD1, 0xDA, 0xB9, 0x6F, 0x9C, 0xC8, 0x78, 0x66, 0x80, 0x2C, 0xF8, 0x37, 0xEA, 0xE0, 0x62, 0xA4, 0xCB, 0x71, 0x50, 0x27, 0x4B, 0x95, 0xD9, 0x20, 0x9D, 0x04, 0x91, 0xE3, 0x47, 0x6A, 0x7E, 0x53, 0xFA, 0x3A, 0x3B, 0xB4, 0xA8, 0xBC, 0x5F, 0x68, 0x08, 0xCA, 0x8F, 0x14, 0xD7, 0xC0, 0xEF, 0x7B, 0x5B, 0xBF, 0x2F, 0xE5, 0xE2, 0x8C, 0xBA, 0x12, 0xE1, 0xAF, 0xB2, 0x54, 0x5D, 0x59, 0x76, 0xDB, 0x32, 0xA2, 0x58, 0x6E, 0x1C, 0x29, 0x64, 0xF3, 0xE9, 0x96, 0x0C, 0x98, 0x19, 0x8D, 0x3E, 0x26, 0xAB, 0xA5, 0x85, 0x16, 0x40, 0xBD, 0x49, 0x67, 0xDC, 0x22, 0x94, 0xBB, 0x3C, 0xC1, 0x9B, 0xEB, 0x45, 0x28, 0x18, 0xD8, 0x1A, 0x42, 0x7D, 0xCC, 0xFB, 0x65, 0x8E, 0x3D, 0xCD, 0x2A, 0xA3, 0x60, 0xAE, 0x93, 0x8A, 0x48, 0x97, 0x51, 0x15, 0xF7, 0x01, 0x0B, 0xB7, 0x36, 0xB1, 0x2E, 0x11, 0xFD, 0x84, 0x2D, 0x3F, 0x13, 0x88, 0xB3, 0x34, 0x24, 0x1B, 0xDE, 0xC5, 0x1D, 0x4D, 0x2B, 0x17, 0x31, 0x74, 0xA9, 0xC6, 0x43, 0x6D, 0x39, 0x90, 0xBE, 0xC3, 0xB0, 0x21, 0x6B, 0xF6, 0x0F, 0xD5, 0x99, 0x0D, 0xAC, 0x1F, 0x5C, 0x9E, 0xF5, 0xF9, 0x4C, 0xD6, 0xDF, 0x89, 0xE4, 0x8B, 0xFF, 0xC7, 0xAA, 0xE7, 0xED, 0x46, 0x25, 0xB6, 0x06, 0x5E, 0x35, 0xB5, 0xEC, 0xCE, 0xE8, 0x6C, 0x30, 0x55, 0x61, 0x4A, 0xFE, 0xA0, 0x79, 0x03, 0xF0, 0x10, 0x72, 0x7C, 0xCF, 0x52, 0xA6, 0xA7, 0xEE, 0x44, 0xD3, 0x9A, 0x57, 0x92, 0xD0, 0x5A, 0x7A, 0x41, 0x7F, 0x0E, 0x00, 0x63, 0xF2, 0x4F, 0x05, 0x83, 0xC9, 0xA1, 0xD4, 0xDD, 0xC4, 0x56, 0xF4, 0xD2, 0x77, 0x81, 0x09, 0x82, 0x33, 0x9F, 0x07, 0x86, 0x75, 0x38, 0x4E, 0x69, 0xF1, 0xAD, 0x23, 0x73, 0x87, 0x70, 0x02, 0xC2, 0x1E, 0xB8, 0x0A, 0xFC, 0xE6 ); /** * 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) { switch ($engine) { case self::ENGINE_OPENSSL: if ($this->current_key_length != 128 || strlen($this->orig_key) < 16) { return false; } $this->cipher_name_openssl_ecb = 'rc2-ecb'; $this->cipher_name_openssl = 'rc2-' . $this->_openssl_translate_mode(); } return parent::isValidEngine($engine); } /** * Sets the key length. * * Valid key lengths are 8 to 1024. * Calling this function after setting the key has no effect until the next * \phpseclib\Crypt\RC2::setKey() call. * * @access public * @param int $length in bits */ function setKeyLength($length) { if ($length < 8) { $this->default_key_length = 1; } elseif ($length > 1024) { $this->default_key_length = 128; } else { $this->default_key_length = $length; } $this->current_key_length = $this->default_key_length; parent::setKeyLength($length); } /** * Returns the current key length * * @access public * @return int */ function getKeyLength() { return $this->current_key_length; } /** * Sets the key. * * Keys can be of any length. RC2, itself, uses 8 to 1024 bit keys (eg. * strlen($key) <= 128), however, we only use the first 128 bytes if $key * has more then 128 bytes in it, and set $key to a single null byte if * it is empty. * * If the key is not explicitly set, it'll be assumed to be a single * null byte. * * @see \phpseclib\Crypt\Base::setKey() * @access public * @param string $key * @param int $t1 optional Effective key length in bits. */ function setKey($key, $t1 = 0) { $this->orig_key = $key; if ($t1 <= 0) { $t1 = $this->default_key_length; } elseif ($t1 > 1024) { $t1 = 1024; } $this->current_key_length = $t1; // Key byte count should be 1..128. $key = strlen($key) ? substr($key, 0, 128) : "\x00"; $t = strlen($key); // The mcrypt RC2 implementation only supports effective key length // of 1024 bits. It is however possible to handle effective key // lengths in range 1..1024 by expanding the key and applying // inverse pitable mapping to the first byte before submitting it // to mcrypt. // Key expansion. $l = array_values(unpack('C*', $key)); $t8 = ($t1 + 7) >> 3; $tm = 0xFF >> (8 * $t8 - $t1); // Expand key. $pitable = $this->pitable; for ($i = $t; $i < 128; $i++) { $l[$i] = $pitable[$l[$i - 1] + $l[$i - $t]]; } $i = 128 - $t8; $l[$i] = $pitable[$l[$i] & $tm]; while ($i--) { $l[$i] = $pitable[$l[$i + 1] ^ $l[$i + $t8]]; } // Prepare the key for mcrypt. $l[0] = $this->invpitable[$l[0]]; array_unshift($l, 'C*'); parent::setKey(call_user_func_array('pack', $l)); } /** * Encrypts a message. * * Mostly a wrapper for \phpseclib\Crypt\Base::encrypt, with some additional OpenSSL handling code * * @see self::decrypt() * @access public * @param string $plaintext * @return string $ciphertext */ function encrypt($plaintext) { if ($this->engine == self::ENGINE_OPENSSL) { $temp = $this->key; $this->key = $this->orig_key; $result = parent::encrypt($plaintext); $this->key = $temp; return $result; } return parent::encrypt($plaintext); } /** * Decrypts a message. * * Mostly a wrapper for \phpseclib\Crypt\Base::decrypt, with some additional OpenSSL handling code * * @see self::encrypt() * @access public * @param string $ciphertext * @return string $plaintext */ function decrypt($ciphertext) { if ($this->engine == self::ENGINE_OPENSSL) { $temp = $this->key; $this->key = $this->orig_key; $result = parent::decrypt($ciphertext); $this->key = $temp; return $result; } return parent::decrypt($ciphertext); } /** * Encrypts a block * * @see \phpseclib\Crypt\Base::_encryptBlock() * @see \phpseclib\Crypt\Base::encrypt() * @access private * @param string $in * @return string */ function _encryptBlock($in) { list($r0, $r1, $r2, $r3) = array_values(unpack('v*', $in)); $keys = $this->keys; $limit = 20; $actions = array($limit => 44, 44 => 64); $j = 0; for (;;) { // Mixing round. $r0 = (($r0 + $keys[$j++] + ((($r1 ^ $r2) & $r3) ^ $r1)) & 0xFFFF) << 1; $r0 |= $r0 >> 16; $r1 = (($r1 + $keys[$j++] + ((($r2 ^ $r3) & $r0) ^ $r2)) & 0xFFFF) << 2; $r1 |= $r1 >> 16; $r2 = (($r2 + $keys[$j++] + ((($r3 ^ $r0) & $r1) ^ $r3)) & 0xFFFF) << 3; $r2 |= $r2 >> 16; $r3 = (($r3 + $keys[$j++] + ((($r0 ^ $r1) & $r2) ^ $r0)) & 0xFFFF) << 5; $r3 |= $r3 >> 16; if ($j === $limit) { if ($limit === 64) { break; } // Mashing round. $r0 += $keys[$r3 & 0x3F]; $r1 += $keys[$r0 & 0x3F]; $r2 += $keys[$r1 & 0x3F]; $r3 += $keys[$r2 & 0x3F]; $limit = $actions[$limit]; } } return pack('vvvv', $r0, $r1, $r2, $r3); } /** * Decrypts a block * * @see \phpseclib\Crypt\Base::_decryptBlock() * @see \phpseclib\Crypt\Base::decrypt() * @access private * @param string $in * @return string */ function _decryptBlock($in) { list($r0, $r1, $r2, $r3) = array_values(unpack('v*', $in)); $keys = $this->keys; $limit = 44; $actions = array($limit => 20, 20 => 0); $j = 64; for (;;) { // R-mixing round. $r3 = ($r3 | ($r3 << 16)) >> 5; $r3 = ($r3 - $keys[--$j] - ((($r0 ^ $r1) & $r2) ^ $r0)) & 0xFFFF; $r2 = ($r2 | ($r2 << 16)) >> 3; $r2 = ($r2 - $keys[--$j] - ((($r3 ^ $r0) & $r1) ^ $r3)) & 0xFFFF; $r1 = ($r1 | ($r1 << 16)) >> 2; $r1 = ($r1 - $keys[--$j] - ((($r2 ^ $r3) & $r0) ^ $r2)) & 0xFFFF; $r0 = ($r0 | ($r0 << 16)) >> 1; $r0 = ($r0 - $keys[--$j] - ((($r1 ^ $r2) & $r3) ^ $r1)) & 0xFFFF; if ($j === $limit) { if ($limit === 0) { break; } // R-mashing round. $r3 = ($r3 - $keys[$r2 & 0x3F]) & 0xFFFF; $r2 = ($r2 - $keys[$r1 & 0x3F]) & 0xFFFF; $r1 = ($r1 - $keys[$r0 & 0x3F]) & 0xFFFF; $r0 = ($r0 - $keys[$r3 & 0x3F]) & 0xFFFF; $limit = $actions[$limit]; } } return pack('vvvv', $r0, $r1, $r2, $r3); } /** * Setup the \phpseclib\Crypt\Base::ENGINE_MCRYPT $engine * * @see \phpseclib\Crypt\Base::_setupMcrypt() * @access private */ function _setupMcrypt() { if (!isset($this->key)) { $this->setKey(''); } parent::_setupMcrypt(); } /** * Creates the key schedule * * @see \phpseclib\Crypt\Base::_setupKey() * @access private */ function _setupKey() { if (!isset($this->key)) { $this->setKey(''); } // Key has already been expanded in \phpseclib\Crypt\RC2::setKey(): // Only the first value must be altered. $l = unpack('Ca/Cb/v*', $this->key); array_unshift($l, $this->pitable[$l['a']] | ($l['b'] << 8)); unset($l['a']); unset($l['b']); $this->keys = $l; } /** * Setup the performance-optimized function for de/encrypt() * * @see \phpseclib\Crypt\Base::_setupInlineCrypt() * @access private */ function _setupInlineCrypt() { $lambda_functions =& self::_getLambdaFunctions(); // The first 10 generated $lambda_functions will use the $keys hardcoded as integers // for the mixing rounds, for better inline crypt performance [~20% faster]. // But for memory reason we have to limit those ultra-optimized $lambda_functions to an amount of 10. // (Currently, for Crypt_RC2, one generated $lambda_function cost on php5.5@32bit ~60kb unfreeable mem and ~100kb on php5.5@64bit) $gen_hi_opt_code = (bool)(count($lambda_functions) < 10); // Generation of a unique hash for our generated code $code_hash = "Crypt_RC2, {$this->mode}"; if ($gen_hi_opt_code) { $code_hash = str_pad($code_hash, 32) . $this->_hashInlineCryptFunction($this->key); } // Is there a re-usable $lambda_functions in there? // If not, we have to create it. if (!isset($lambda_functions[$code_hash])) { // Init code for both, encrypt and decrypt. $init_crypt = '$keys = $self->keys;'; switch (true) { case $gen_hi_opt_code: $keys = $this->keys; default: $keys = array(); foreach ($this->keys as $k => $v) { $keys[$k] = '$keys[' . $k . ']'; } } // $in is the current 8 bytes block which has to be en/decrypt $encrypt_block = $decrypt_block = ' $in = unpack("v4", $in); $r0 = $in[1]; $r1 = $in[2]; $r2 = $in[3]; $r3 = $in[4]; '; // Create code for encryption. $limit = 20; $actions = array($limit => 44, 44 => 64); $j = 0; for (;;) { // Mixing round. $encrypt_block .= ' $r0 = (($r0 + ' . $keys[$j++] . ' + ((($r1 ^ $r2) & $r3) ^ $r1)) & 0xFFFF) << 1; $r0 |= $r0 >> 16; $r1 = (($r1 + ' . $keys[$j++] . ' + ((($r2 ^ $r3) & $r0) ^ $r2)) & 0xFFFF) << 2; $r1 |= $r1 >> 16; $r2 = (($r2 + ' . $keys[$j++] . ' + ((($r3 ^ $r0) & $r1) ^ $r3)) & 0xFFFF) << 3; $r2 |= $r2 >> 16; $r3 = (($r3 + ' . $keys[$j++] . ' + ((($r0 ^ $r1) & $r2) ^ $r0)) & 0xFFFF) << 5; $r3 |= $r3 >> 16;'; if ($j === $limit) { if ($limit === 64) { break; } // Mashing round. $encrypt_block .= ' $r0 += $keys[$r3 & 0x3F]; $r1 += $keys[$r0 & 0x3F]; $r2 += $keys[$r1 & 0x3F]; $r3 += $keys[$r2 & 0x3F];'; $limit = $actions[$limit]; } } $encrypt_block .= '$in = pack("v4", $r0, $r1, $r2, $r3);'; // Create code for decryption. $limit = 44; $actions = array($limit => 20, 20 => 0); $j = 64; for (;;) { // R-mixing round. $decrypt_block .= ' $r3 = ($r3 | ($r3 << 16)) >> 5; $r3 = ($r3 - ' . $keys[--$j] . ' - ((($r0 ^ $r1) & $r2) ^ $r0)) & 0xFFFF; $r2 = ($r2 | ($r2 << 16)) >> 3; $r2 = ($r2 - ' . $keys[--$j] . ' - ((($r3 ^ $r0) & $r1) ^ $r3)) & 0xFFFF; $r1 = ($r1 | ($r1 << 16)) >> 2; $r1 = ($r1 - ' . $keys[--$j] . ' - ((($r2 ^ $r3) & $r0) ^ $r2)) & 0xFFFF; $r0 = ($r0 | ($r0 << 16)) >> 1; $r0 = ($r0 - ' . $keys[--$j] . ' - ((($r1 ^ $r2) & $r3) ^ $r1)) & 0xFFFF;'; if ($j === $limit) { if ($limit === 0) { break; } // R-mashing round. $decrypt_block .= ' $r3 = ($r3 - $keys[$r2 & 0x3F]) & 0xFFFF; $r2 = ($r2 - $keys[$r1 & 0x3F]) & 0xFFFF; $r1 = ($r1 - $keys[$r0 & 0x3F]) & 0xFFFF; $r0 = ($r0 - $keys[$r3 & 0x3F]) & 0xFFFF;'; $limit = $actions[$limit]; } } $decrypt_block .= '$in = pack("v4", $r0, $r1, $r2, $r3);'; // Creates the inline-crypt function $lambda_functions[$code_hash] = $this->_createInlineCryptFunction( array( 'init_crypt' => $init_crypt, 'encrypt_block' => $encrypt_block, 'decrypt_block' => $decrypt_block ) ); } // Set the inline-crypt function as callback in: $this->inline_crypt $this->inline_crypt = $lambda_functions[$code_hash]; } }