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- <?php
- define('CRYPT_RC4_MODE_INTERNAL', 1);
- define('CRYPT_RC4_MODE_MCRYPT', 2);
- define('CRYPT_RC4_ENCRYPT', 0);
- define('CRYPT_RC4_DECRYPT', 1);
- class Crypt_RC4 {
-
- var $key = "\0";
-
- var $encryptStream = false;
-
- var $decryptStream = false;
-
- var $encryptIndex = 0;
-
- var $decryptIndex = 0;
-
- var $mode;
-
- var $continuousBuffer = false;
-
- function Crypt_RC4()
- {
- if ( !defined('CRYPT_RC4_MODE') ) {
- switch (true) {
- case extension_loaded('mcrypt') && (defined('MCRYPT_ARCFOUR') || defined('MCRYPT_RC4')) && in_array('arcfour', mcrypt_list_algorithms()):
- define('CRYPT_RC4_MODE', CRYPT_RC4_MODE_MCRYPT);
- break;
- default:
- define('CRYPT_RC4_MODE', CRYPT_RC4_MODE_INTERNAL);
- }
- }
- switch ( CRYPT_RC4_MODE ) {
- case CRYPT_RC4_MODE_MCRYPT:
- switch (true) {
- case defined('MCRYPT_ARCFOUR'):
- $this->mode = MCRYPT_ARCFOUR;
- break;
- case defined('MCRYPT_RC4');
- $this->mode = MCRYPT_RC4;
- }
- $this->encryptStream = mcrypt_module_open($this->mode, '', MCRYPT_MODE_STREAM, '');
- $this->decryptStream = mcrypt_module_open($this->mode, '', MCRYPT_MODE_STREAM, '');
- }
- }
-
- function setKey($key)
- {
- $this->key = $key;
- if ( CRYPT_RC4_MODE == CRYPT_RC4_MODE_MCRYPT ) {
- mcrypt_generic_init($this->encryptStream, $this->key, '');
- mcrypt_generic_init($this->decryptStream, $this->key, '');
- return;
- }
- $keyLength = strlen($key);
- $keyStream = array();
- for ($i = 0; $i < 256; $i++) {
- $keyStream[$i] = $i;
- }
- $j = 0;
- for ($i = 0; $i < 256; $i++) {
- $j = ($j + $keyStream[$i] + ord($key[$i % $keyLength])) & 255;
- $temp = $keyStream[$i];
- $keyStream[$i] = $keyStream[$j];
- $keyStream[$j] = $temp;
- }
- $this->encryptIndex = $this->decryptIndex = array(0, 0);
- $this->encryptStream = $this->decryptStream = $keyStream;
- }
-
- function setPassword($password, $method = 'pbkdf2')
- {
- $key = '';
- switch ($method) {
- default:
- list(, , $hash, $salt, $count) = func_get_args();
- if (!isset($hash)) {
- $hash = 'sha1';
- }
-
- if (!isset($salt)) {
- $salt = 'phpseclib/salt';
- }
-
-
- if (!isset($count)) {
- $count = 1000;
- }
- if (!isset($dkLen)) {
- $dkLen = 128;
- }
- if (!class_exists('Crypt_Hash')) {
- require_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;
- }
- }
- $this->setKey(substr($key, 0, $dkLen));
- }
-
- function setIV($iv)
- {
- }
-
- function encrypt($plaintext)
- {
- return $this->_crypt($plaintext, CRYPT_RC4_ENCRYPT);
- }
-
- function decrypt($ciphertext)
- {
- return $this->_crypt($ciphertext, CRYPT_RC4_DECRYPT);
- }
-
- function _crypt($text, $mode)
- {
- if ( CRYPT_RC4_MODE == CRYPT_RC4_MODE_MCRYPT ) {
- $keyStream = $mode == CRYPT_RC4_ENCRYPT ? 'encryptStream' : 'decryptStream';
- if (!$this->continuousBuffer) {
- mcrypt_generic_init($this->$keyStream, $this->key, '');
- }
- return mcrypt_generic($this->$keyStream, $text);
- }
- if ($this->encryptStream === false) {
- $this->setKey($this->key);
- }
- switch ($mode) {
- case CRYPT_RC4_ENCRYPT:
- $keyStream = $this->encryptStream;
- list($i, $j) = $this->encryptIndex;
- break;
- case CRYPT_RC4_DECRYPT:
- $keyStream = $this->decryptStream;
- list($i, $j) = $this->decryptIndex;
- }
- $newText = '';
- for ($k = 0; $k < strlen($text); $k++) {
- $i = ($i + 1) & 255;
- $j = ($j + $keyStream[$i]) & 255;
- $temp = $keyStream[$i];
- $keyStream[$i] = $keyStream[$j];
- $keyStream[$j] = $temp;
- $temp = $keyStream[($keyStream[$i] + $keyStream[$j]) & 255];
- $newText.= chr(ord($text[$k]) ^ $temp);
- }
- if ($this->continuousBuffer) {
- switch ($mode) {
- case CRYPT_RC4_ENCRYPT:
- $this->encryptStream = $keyStream;
- $this->encryptIndex = array($i, $j);
- break;
- case CRYPT_RC4_DECRYPT:
- $this->decryptStream = $keyStream;
- $this->decryptIndex = array($i, $j);
- }
- }
- return $newText;
- }
-
- function enableContinuousBuffer()
- {
- if ( CRYPT_RC4_MODE == CRYPT_RC4_MODE_MCRYPT ) {
- mcrypt_generic_init($this->encryptStream, $this->key, '');
- mcrypt_generic_init($this->decryptStream, $this->key, '');
- }
- $this->continuousBuffer = true;
- }
-
- function disableContinuousBuffer()
- {
- if ( CRYPT_RC4_MODE == CRYPT_RC4_MODE_INTERNAL ) {
- $this->encryptIndex = $this->decryptIndex = array(0, 0);
- $this->encryptStream = $this->decryptStream = false;
- }
- $this->continuousBuffer = false;
- }
-
- function enablePadding()
- {
- }
-
- function disablePadding()
- {
- }
- }
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