<?
##############################################
# Bitrix: SiteManager                        #
# Copyright (c) 2002-2006 Bitrix             #
# http://www.bitrixsoft.com                  #
# mailto:admin@bitrixsoft.com                #
##############################################

////////////////////////////////////////////////////////////////////////////////////////
// $data = "some data string";
//
// $c = new CCrypt(CRYPT_MODE_ECB, "blowfish", "password");
// $data1 = $c->Encrypt($data);
//
// $s = new CSteganos();
// $s->HideData($_SERVER["DOCUMENT_ROOT"]."/crypt/user.bmp", $data1, $_SERVER["DOCUMENT_ROOT"]."/crypt/user1.bmp", 2);
//
// $s = new CSteganos();
// $data2 = $s->ShowData($_SERVER["DOCUMENT_ROOT"]."/crypt/user1.bmp");
//
// $c = new CCrypt(CRYPT_MODE_ECB, "blowfish", "password");
// $data3 = $c->Decrypt($data2);
//
//
// $c = new CCrypt(CRYPT_MODE_CBC, "blowfish", "password");
// $data1 = $c->Encrypt($data);
//
// $data1 = str_pad(strlen($c->iv), 5).$c->iv.$data1;
//
// $s = new CSteganos();
// $s->HideData($_SERVER["DOCUMENT_ROOT"]."/crypt/user.txt", $data1, $_SERVER["DOCUMENT_ROOT"]."/crypt/user1.txt", 2);
//
// $s = new CSteganos();
// $data2 = $s->ShowData($_SERVER["DOCUMENT_ROOT"]."/crypt/user1.txt");
//
// $ivSize = IntVal(substr($data2, 0, 5));
// $iv = substr($data2, 5, $ivSize);
// $data2 = substr($data2, 5 + $ivSize);
//
// $c = new CCrypt(CRYPT_MODE_CBC, "blowfish", "password", $iv);
// $data3 = $c->Decrypt($data2);
////////////////////////////////////////////////////////////////////////////////////////


/************************************************************************************/
/************   Cryptography   *******************************************************/
/************************************************************************************/

// CRYPT_MODE_ECB (electronic codebook) is suitable for random data, such as
// encrypting other keys. In ECB mode the blocks are encrypted independently.
// Since data there is short and random, the disadvantages of ECB have a
// favorable negative effect.
define("CRYPT_MODE_ECB", 0);

// CRYPT_MODE_CBC (cipher block chaining) is especially suitable for encrypting
// files where the security is increased over ECB significantly. In CBC mode each
// block is xored with the last. This function use initialization vector ($iv) as first block.
define("CRYPT_MODE_CBC", 1);

class CCrypt
{
    var $blockCipherMode = CRYPT_MODE_CBC;
    var $key = "";
    var $iv = "";
    /** @var CCryptblowfish|CCryptrc4 */
    var $cipher = null;
    var $errorMessage = "";


    public function __construct($blockCipherMode = CRYPT_MODE_CBC, $cipher = "blowfish", $key = "", $iv = "")
    {
        $cipher = strtolower($cipher);

        if (!class_exists("CCrypt".$cipher))
        {
            $this->errorMessage = "Class 'CCrypt".$cipher."' doesn't exists";
        }
        else
        {
            $class = "CCrypt".$cipher;
            $this->cipher = new $class($key);
            $this->blockCipherMode = $blockCipherMode;
            $this->key = $key;
            $this->iv = $iv;

            switch ($this->blockCipherMode)
            {
                case CRYPT_MODE_ECB:
                    break;

                case CRYPT_MODE_CBC:
                    if (strlen($this->iv) <= 0)
                        $this->CreateIV();
                    break;

                default:
                    $this->errorMessage = "Invalid mode '".$this->blockCipherMode."'";
            }
        }
    }


    function CreateIV()
    {
        $ivSize = $this->cipher->blockSize;
        $ivSize = IntVal($ivSize);

       $iv = "";
        for ($i = 0; $i < $ivSize; $i++)
            $iv .= chr(rand(0, 255));

        $this->iv = $iv;
    }


    function Encrypt($text)
    {
        if (empty($text))
        {
            $this->errorMessage = "Empty source text";
            return False;
        }

        $cipher = false;
        switch ($this->blockCipherMode)
        {
            case CRYPT_MODE_ECB:
                $cipher = $this->__EncryptECB($text);
                break;

            case CRYPT_MODE_CBC:
                $cipher = $this->__EncryptCBC($text);
                break;

            default:
                $this->errorMessage = "Invalid mode '".$this->blockCipherMode."'";
        }

        return $cipher;
    }


    function Decrypt($cipher)
    {
        if (empty($cipher))
        {
            $this->errorMessage = "Empty cipher text";
            return False;
        }

        $text = false;
        switch ($this->blockCipherMode)
        {
            case CRYPT_MODE_ECB:
                $text = $this->__DecryptECB($cipher);
                break;

            case CRYPT_MODE_CBC:
                $text = $this->__DecryptCBC($cipher);
                break;

            default:
                $this->errorMessage = "Invalid mode '".$this->blockCipherMode."'";
        }

        return $text;
    }


    function __EncryptECB($text)
    {
        $blockSize = $this->cipher->blockSize;
        $cipher = "";

        if ($blockSize <= 0)
        {
            $cipher = $this->cipher->__Encrypt($text);
        }
        else
        {
            $textLength = strlen($text);
            for ($i = 0; $i < $textLength; $i = $i + $blockSize)
            {
                $block = substr($text, $i, $blockSize);

                if (strlen($block) < $blockSize)
                    $block = str_pad($block, $blockSize, "\0", STR_PAD_LEFT);

                $cipher .= $this->cipher->__Encrypt($block);
            }
        }

        return $cipher;
    }


    function __DecryptECB($cipher)
    {
        $blockSize = $this->cipher->blockSize;
        $text = "";

        if ($blockSize <= 0)
        {
            $text = $this->cipher->__Decrypt($cipher);
        }
        else
        {
            $cipherLength = strlen($cipher);
            for ($i = 0; $i < $cipherLength; $i = $i + $blockSize)
            {
                $block = substr($cipher, $i, $blockSize);
                $block = $this->cipher->__Decrypt($block);

                while (substr($block, 0, 1) == "\0")
                     $block = substr($block, 1);

                $text .= $block;
            }
        }

        return $text;
    }


    function __EncryptCBC($text)
    {
        $blockSize = $this->cipher->blockSize;
        $cipher = "";

        if ($blockSize <= 0)
        {
            $cipher = $this->cipher->__Encrypt($text);
        }
        else
        {
            $textLength = strlen($text);
            $lastCipher = $this->iv;

            for ($i = 0; $i < $textLength; $i = $i + $blockSize)
            {
                $block = substr($text, $i, $blockSize);

                if (strlen($block) < $blockSize)
                    $block = str_pad($block, $blockSize, "\0", STR_PAD_LEFT);

                $lastCipher = $this->cipher->__Encrypt($block ^ $lastCipher);
                $cipher .= $lastCipher;
            }
        }

        return $cipher;
    }


    function __DecryptCBC($cipher)
    {
        $blockSize = $this->cipher->blockSize;
        $text = '';

        if ($blockSize <= 0)
        {
            $text = $this->cipher->__Decrypt($cipher);
        }
        else
        {
            $cipherLength = strlen($cipher);
            $lastCipher = $this->iv;

            for ($i = 0; $i < $cipherLength; $i = $i + $blockSize)
            {
                $block = substr($cipher, $i, $blockSize);

                $decryptBlock = $lastCipher ^ $this->cipher->__Decrypt($block);
                $lastCipher = $block;

                while (substr($decryptBlock, 0, 1) == "\0")
                    $decryptBlock = substr($decryptBlock, 1);

                $text .= $decryptBlock;
            }
        }

        return $text;
    }
}


/************************************************************************************/
/************   Steganography   *****************************************************/
/************************************************************************************/

class CSteganos
{
    var $errorMessage = "";

    var $data = "";
    var $containerFile = "";
    var $containerData = "";
    var $resultFile = "";

    var $containerType = "";

    var $level;
    var $dataSize;
    var $offset;


    public function __construct()
    {
    }


    function HideData($containerFile, $data, $resultFile, $level = 2)
    {
        if (!file_exists($containerFile) || !is_file($containerFile) || !is_readable($containerFile))
        {
            $this->errorMessage = "The container file '".$containerFile."' was not found or not readable";
            return false;
        }

        $containerFile_tmp = trim($containerFile, ". \r\n\t");
        $arContainerFile_tmp = explode(".", $containerFile_tmp);
        $containerFileExt = strtolower($arContainerFile_tmp[count($arContainerFile_tmp) - 1]);
        switch (strtolower($containerFileExt))
        {
            case "bmp":
                $this->containerType = "bmp";
                break;
            case "txt":
            case "php":
            case "html":
            case "htm":
            case "css":
                $this->containerType = "txt";
                break;
            default:
                $this->errorMessage = "Unknown container type";
                return false;
        }

        if (empty($data))
        {
            $this->errorMessage = "No data to hide";
            return false;
        }

        if (empty($resultFile))
        {
            $this->errorMessage = "The output file was not specified";
            return false;
        }

        $this->data = $data;
        $this->containerFile = $containerFile;
        $this->resultFile = $resultFile;
        $this->level = $level;

        if (!$this->__CheckContainer())
            return false;

        $this->__OpenContainer();

        //$this->__CompressData();

        $this->__HideData();

        $this->__SaveResult();

        return null;
    }


    function ShowData($containerFile)
    {
        if (!file_exists($containerFile) || !is_file($containerFile) || !is_readable($containerFile))
        {
            $this->errorMessage = "The container file '".$containerFile."' was not found or not readable";
            return false;
        }

        $containerFile_tmp = trim($containerFile, ". \r\n\t");
        $arContainerFile_tmp = explode(".", $containerFile_tmp);
        $containerFileExt = strtolower($arContainerFile_tmp[count($arContainerFile_tmp) - 1]);
        switch (strtolower($containerFileExt))
        {
            case "bmp":
                $this->containerType = "bmp";
                break;
            case "txt":
            case "php":
            case "html":
            case "htm":
            case "css":
                $this->containerType = "txt";
                break;
            default:
                $this->errorMessage = "Unknown container type";
                return false;
        }

        $this->containerFile = $containerFile;

        $this->__OpenContainer();

        if (!$this->__GetHiddenInfo())
            return false;

        $this->__ShowData();

        //$this->__UnCompressData();

        return $this->data;
    }


    function __CompressData()
    {
        if (function_exists("gzcompress"))
        {
            $this->data = "BCDW".$this->data;
            $this->data = gzcompress($this->data, 9);
        }
    }

    function __UnCompressData()
    {
        if (function_exists("gzuncompress"))
        {
            $data1 = gzuncompress($this->data);
            if ($data1 && substr($data1, 0, 4) == "BCDW")
                $this->data = substr($data1, 4);
        }
    }


    function __CheckContainer()
    {
        if ($this->containerType == "bmp")
        {
            if ($this->level < 1 || $this->level > 4)
            {
                $this->errorMessage = "The encryption level is out of range";
                return False;
            }

            $containerSize = filesize($this->containerFile);
            $this->dataSize = strlen($this->data);
            $totalSize = (12 + $this->dataSize) * (ceil(8 / $this->level));
            if (($containerSize - 55) < $totalSize)
            {
                $this->errorMessage = "The bitmap file '".$this->containerFile."' is too small to carry the input data";
                return False;
            }
        }
        return True;
    }

    function __OpenContainer()
    {
        if (function_exists("file_get_contents"))
        {
            $this->containerData = file_get_contents($this->containerFile);
        }
        else
        {
            $fd = fopen($this->containerFile, "rb");
            $this->containerData = fread($fd, filesize($this->containerFile));
            fclose($fd);
        }
    }


    function __SaveResult()
    {
        $fp = fopen($this->resultFile, "wb");
        fwrite($fp, $this->containerData);
        fclose($fp);

        $this->containerData = "";
    }


    function __HideData()
    {
        if ($this->containerType == "bmp")
        {
            $levelBase = IntVal(8 / $this->level);
            $num = 0;
            for ($i = 0; $i < $this->level; $i++)
            {
                $num = $num << 1;
                $num = $num + 1;
            }
            $num = 255 ^ $num;

            $data = sprintf("BSAW%08x", strlen($this->data)).$this->data;

            for ($i = 0, $j = 55, $len = strlen($data); $i < $len; $i++, $j += $levelBase)
            {
                $temp = sprintf("%08s", decbin(ord(substr($data, $i, 1))));
                for ($k = 0; $k < $levelBase; $k++)
                {
                    $this->containerData[$j + $k] = chr(ord($this->containerData[$j + $k]) & $num);

                    $n = 0;
                    for ($t = 0; $t < $this->level; $t++)
                        $n += ($temp[$k * $this->level + $t] == '1') ? (1 << ($this->level - 1 - $t)) : 0;

                    if ($n != 0)
                        $this->containerData[$j + $k] = chr(ord($this->containerData[$j + $k]) + $n);
                }
            }
        }
        elseif ($this->containerType == "txt")
        {
            $data = "";
            for ($i = 0, $n = strlen($this->data); $i < $n; $i++)
            {
                $data .= $this->__ConvertToBitString(ord($this->data[$i]));
            }

            $containerDataLength = sprintf("%08X", strlen($this->containerData));
            for ($i = 6; $i >= 0; $i -= 2)
            {
                sscanf(substr($containerDataLength, $i, 2), "%X", $b);
                $data .= $this->__ConvertToBitString($b);
            }

            $this->containerData .= $data."\r\n";
        }
    }

    function __ConvertToBitString($bite)
    {
        $mask = 0x80;
        $bitString = "";
        for ($i = 0; $i < 8; $i++)
        {
            $bitString .= ($bite & $mask) ? "\t" : " ";
            $mask >>= 1;
        }
        return $bitString;
    }

    function __ShowData()
    {
        if ($this->containerType == "bmp")
        {
            $nBytes = (($this->level == 1) ? 8 : (($this->level == 2) ? 4 : 2));

            $this->data = "";
            for ($i = 0; $i < $this->dataSize; $i++)
                $this->data = chr(0);

            for ($i = $this->offset, $j = 0; $i < $this->offset + $this->dataSize * $nBytes; $i += $nBytes, $j++)
            {
                if ($this->level == 1)
                {
                    for ($k = 0, $n = 7; $k < 8; $k++, $n--)
                        $this->data[$j] = chr(ord($this->data[$j]) | ((ord($this->containerData[$i + $k]) & 1) << $n));
                }
                elseif ($this->level == 2)
                {
                    for ($k = 0, $n = 6; $k < 4; $k++, $n -= 2)
                        $this->data[$j] = chr(ord($this->data[$j]) | ((ord($this->containerData[$i + $k]) & 3) << $n));
                }
                elseif ($this->level == 4)
                {
                    for ($k = 0; $k < 2; $k++)
                    {
                        if ($k == 0)
                            $this->data[$j] = chr(ord($this->data[$j]) | ((ord($this->containerData[$i]) & 15) << 4));
                        else
                            $this->data[$j] = chr(ord($this->data[$j]) | (ord($this->containerData[$i + 1]) & 15));
                    }
                }
            }
        }
        elseif ($this->containerType == "txt")
        {
            $data = substr($this->containerData, $this->offset, $this->dataSize);
            $this->data = $this->__ConvertBitStringToBinary($data);
        }
    }


    function __GetHiddenInfo()
    {
        if ($this->containerType == "bmp")
        {
            $this->level = -1;


            $header = "";
            for ($i = 0; $i < 12; $i++)
                $header = chr(0);

            for ($i = 55, $j = 7, $k = 0; $i < 151; $i++)
            {
                $header[$k] = chr(ord($header[$k]) | ((ord($this->containerData[$i]) & 1) << $j));
                $j--;
                if ($j < 0)
                {
                    $j = 7;
                    $k++;
                }
            }

            if (!strcmp(substr($header, 0, 4), "BSAW"))
            {
                sscanf(substr($header, 4, 8), "%x", $this->dataSize);
                $this->level = 1;
                $this->offset = 151;
            }


            if ($this->level == -1)
            {
                $header = "";
                for ($i = 0; $i < 12; $i++)
                    $header = chr(0);

                for ($i = 55, $j = 6, $k = 0; $i < 103; $i++)
                {
                    $header[$k] = chr(ord($header[$k]) | ((ord($this->containerData[$i]) & 3) << $j));
                    $j -= 2;
                    if ($j < 0)
                    {
                        $j = 6;
                        $k++;
                    }
                }

                if (!strcmp(substr($header, 0, 4), "BSAW"))
                {
                    sscanf(substr($header, 4, 8), "%x", $this->dataSize);
                    $this->level = 2;
                    $this->offset = 103;
                }
            }


            if ($this->level == -1)
            {
                $header = "";
                for ($i = 0; $i < 12; $i++)
                    $header = chr(0);

                for ($i = 55, $j = 0; $i < 79; $i += 2, $j++)
                {
                    for ($k = 0; $k < 2; $k++)
                    {
                        if ($k == 0)
                            $header[$j] = chr(ord($header[$j]) | ((ord($this->containerData[$i]) & 15) << 4));
                        else
                            $header[$j] = chr(ord($header[$j]) | (ord($this->containerData[$i+1]) & 15));
                    }
                }

                if (!strcmp(substr($header, 0, 4), "BSAW"))
                {
                    sscanf(substr($header, 4, 8), "%x", $this->dataSize);
                    $this->level = 4;
                    $this->offset = 79;
                }
            }

            if ($this->level == -1)
            {
                $this->errorMessage = "The bitmap file '".$this->containerFile."' contains no encrypted data";
                return false;
            }

            $nBytes = (($this->level == 1) ? 8 : (($this->level == 2) ? 4 : 2));

            if ($this->offset + $this->dataSize * $nBytes > strlen($this->containerData))
            {
                $this->errorMessage = "The container file '".$this->containerFile."' contains no encrypted data";
                return false;
            }
        }
        elseif ($this->containerType == "txt")
        {
            $endStr = strrchr($this->containerData, "\r");
            if ($endStr === false || $endStr[1] != "\n")
            {
                $this->errorMessage = "The container file '".$this->containerFile."' contains no encrypted data";
                return false;
            }

            $bits = substr($this->containerData, strlen($this->containerData) - strlen($endStr) - 32, 32);
            $containerDataLength_bin = $this->__ConvertBitStringToBinary($bits);
            if ($containerDataLength_bin == false)
            {
                $this->errorMessage = "The container file '".$this->containerFile."' contains no encrypted data";
                return false;
            }

            $containerDataLength_hex = "";
            for ($i = 3; $i >= 0; $i--)
                $containerDataLength_hex .= sprintf("%02X", ord($containerDataLength_bin[$i]));
            sscanf($containerDataLength_hex, "%X", $this->offset);

            $this->dataSize = strlen($this->containerData) - strlen($endStr) - 32 - $this->offset;
        }

        return True;
    }

    function __ConvertBitStringToBinary($bitStr)
    {
        $mask = 0x80;
        $b = 0;
        $j = 0;
        $binStr = "";
        for ($i = 0, $n = strlen($bitStr); $i < $n; $i++)
        {
            if ($j == 0)
            {
                $b = 0;
                $mask = 0x80;
            }
            if ($bitStr[$i] == "\t")
                $b |= $mask;
            elseif ($bitStr[$i] != " ")
            {
                $this->errorMessage = "The container file '".$this->containerFile."' contains no encrypted data";
                return false;
            }
            $mask >>= 1;
            $j++;
            if ($j == 8)
            {
                $binStr .= chr($b);
                $j = 0;
            }
        }

        return $binStr;
    }
}


/************************************************************************************/
/************   Blowfish   **********************************************************/
/************************************************************************************/

/*
Blowfish is a variable-length key, 64-bit block cipher. The algorithm consists of two parts:
a key-expansion part and a data-encryption part. Key expansion converts a key of at most
448 bits into several subkey arrays totaling 4168 bytes.

Data encryption occurs via a 16-round Feistel network. Each round consists of a key-dependent
permutation, and a key- and data-dependent substitution. All operations are XORs and
additions on 32-bit words. The only additional operations are four indexed array data lookups
per round.
*/

class CCryptblowfish
{

    /*
    Initialize first the P-array and then the four S-boxes, in order, with a fixed string.
    This string consists of the hexadecimal digits of pi (less the initial 3).
    */

    /* The P-array consists of 18 32-bit subkeys */
    var $arrP = array(
        0x243f6a88, 0x85a308d3, 0x13198a2e, 0x03707344, 0xa4093822, 0x299f31d0,
        0x082efa98, 0xec4e6c89, 0x452821e6, 0x38d01377, 0xbe5466cf, 0x34e90c6c,
        0xc0ac29b7, 0xc97c50dd, 0x3f84d5b5, 0xb5470917, 0x9216d5d9, 0x8979fb1b
    );

    /* There are four 32-bit S-boxes with 256 entries each */
    var $arrSBox0 = array(
        0xd1310ba6, 0x98dfb5ac, 0x2ffd72db, 0xd01adfb7, 0xb8e1afed, 0x6a267e96,
        0xba7c9045, 0xf12c7f99, 0x24a19947, 0xb3916cf7, 0x0801f2e2, 0x858efc16,
        0x636920d8, 0x71574e69, 0xa458fea3, 0xf4933d7e, 0x0d95748f, 0x728eb658,
        0x718bcd58, 0x82154aee, 0x7b54a41d, 0xc25a59b5, 0x9c30d539, 0x2af26013,
        0xc5d1b023, 0x286085f0, 0xca417918, 0xb8db38ef, 0x8e79dcb0, 0x603a180e,
        0x6c9e0e8b, 0xb01e8a3e, 0xd71577c1, 0xbd314b27, 0x78af2fda, 0x55605c60,
        0xe65525f3, 0xaa55ab94, 0x57489862, 0x63e81440, 0x55ca396a, 0x2aab10b6,
        0xb4cc5c34, 0x1141e8ce, 0xa15486af, 0x7c72e993, 0xb3ee1411, 0x636fbc2a,
        0x2ba9c55d, 0x741831f6, 0xce5c3e16, 0x9b87931e, 0xafd6ba33, 0x6c24cf5c,
        0x7a325381, 0x28958677, 0x3b8f4898, 0x6b4bb9af, 0xc4bfe81b, 0x66282193,
        0x61d809cc, 0xfb21a991, 0x487cac60, 0x5dec8032, 0xef845d5d, 0xe98575b1,
        0xdc262302, 0xeb651b88, 0x23893e81, 0xd396acc5, 0x0f6d6ff3, 0x83f44239,
        0x2e0b4482, 0xa4842004, 0x69c8f04a, 0x9e1f9b5e, 0x21c66842, 0xf6e96c9a,
        0x670c9c61, 0xabd388f0, 0x6a51a0d2, 0xd8542f68, 0x960fa728, 0xab5133a3,
        0x6eef0b6c, 0x137a3be4, 0xba3bf050, 0x7efb2a98, 0xa1f1651d, 0x39af0176,
        0x66ca593e, 0x82430e88, 0x8cee8619, 0x456f9fb4, 0x7d84a5c3, 0x3b8b5ebe,
        0xe06f75d8, 0x85c12073, 0x401a449f, 0x56c16aa6, 0x4ed3aa62, 0x363f7706,
        0x1bfedf72, 0x429b023d, 0x37d0d724, 0xd00a1248, 0xdb0fead3, 0x49f1c09b,
        0x075372c9, 0x80991b7b, 0x25d479d8, 0xf6e8def7, 0xe3fe501a, 0xb6794c3b,
        0x976ce0bd, 0x04c006ba, 0xc1a94fb6, 0x409f60c4, 0x5e5c9ec2, 0x196a2463,
        0x68fb6faf, 0x3e6c53b5, 0x1339b2eb, 0x3b52ec6f, 0x6dfc511f, 0x9b30952c,
        0xcc814544, 0xaf5ebd09, 0xbee3d004, 0xde334afd, 0x660f2807, 0x192e4bb3,
        0xc0cba857, 0x45c8740f, 0xd20b5f39, 0xb9d3fbdb, 0x5579c0bd, 0x1a60320a,
        0xd6a100c6, 0x402c7279, 0x679f25fe, 0xfb1fa3cc, 0x8ea5e9f8, 0xdb3222f8,
        0x3c7516df, 0xfd616b15, 0x2f501ec8, 0xad0552ab, 0x323db5fa, 0xfd238760,
        0x53317b48, 0x3e00df82, 0x9e5c57bb, 0xca6f8ca0, 0x1a87562e, 0xdf1769db,
        0xd542a8f6, 0x287effc3, 0xac6732c6, 0x8c4f5573, 0x695b27b0, 0xbbca58c8,
        0xe1ffa35d, 0xb8f011a0, 0x10fa3d98, 0xfd2183b8, 0x4afcb56c, 0x2dd1d35b,
        0x9a53e479, 0xb6f84565, 0xd28e49bc, 0x4bfb9790, 0xe1ddf2da, 0xa4cb7e33,
        0x62fb1341, 0xcee4c6e8, 0xef20cada, 0x36774c01, 0xd07e9efe, 0x2bf11fb4,
        0x95dbda4d, 0xae909198, 0xeaad8e71, 0x6b93d5a0, 0xd08ed1d0, 0xafc725e0,
        0x8e3c5b2f, 0x8e7594b7, 0x8ff6e2fb, 0xf2122b64, 0x8888b812, 0x900df01c,
        0x4fad5ea0, 0x688fc31c, 0xd1cff191, 0xb3a8c1ad, 0x2f2f2218, 0xbe0e1777,
        0xea752dfe, 0x8b021fa1, 0xe5a0cc0f, 0xb56f74e8, 0x18acf3d6, 0xce89e299,
        0xb4a84fe0, 0xfd13e0b7, 0x7cc43b81, 0xd2ada8d9, 0x165fa266, 0x80957705,
        0x93cc7314, 0x211a1477, 0xe6ad2065, 0x77b5fa86, 0xc75442f5, 0xfb9d35cf,
        0xebcdaf0c, 0x7b3e89a0, 0xd6411bd3, 0xae1e7e49, 0x00250e2d, 0x2071b35e,
        0x226800bb, 0x57b8e0af, 0x2464369b, 0xf009b91e, 0x5563911d, 0x59dfa6aa,
        0x78c14389, 0xd95a537f, 0x207d5ba2, 0x02e5b9c5, 0x83260376, 0x6295cfa9,
        0x11c81968, 0x4e734a41, 0xb3472dca, 0x7b14a94a, 0x1b510052, 0x9a532915,
        0xd60f573f, 0xbc9bc6e4, 0x2b60a476, 0x81e67400, 0x08ba6fb5, 0x571be91f,
        0xf296ec6b, 0x2a0dd915, 0xb6636521, 0xe7b9f9b6, 0xff34052e, 0xc5855664,
        0x53b02d5d, 0xa99f8fa1, 0x08ba4799, 0x6e85076a
    );

    var $arrSBox1 = array(
        0x4b7a70e9, 0xb5b32944, 0xdb75092e, 0xc4192623, 0xad6ea6b0, 0x49a7df7d,
        0x9cee60b8, 0x8fedb266, 0xecaa8c71, 0x699a17ff, 0x5664526c, 0xc2b19ee1,
        0x193602a5, 0x75094c29, 0xa0591340, 0xe4183a3e, 0x3f54989a, 0x5b429d65,
        0x6b8fe4d6, 0x99f73fd6, 0xa1d29c07, 0xefe830f5, 0x4d2d38e6, 0xf0255dc1,
        0x4cdd2086, 0x8470eb26, 0x6382e9c6, 0x021ecc5e, 0x09686b3f, 0x3ebaefc9,
        0x3c971814, 0x6b6a70a1, 0x687f3584, 0x52a0e286, 0xb79c5305, 0xaa500737,
        0x3e07841c, 0x7fdeae5c, 0x8e7d44ec, 0x5716f2b8, 0xb03ada37, 0xf0500c0d,
        0xf01c1f04, 0x0200b3ff, 0xae0cf51a, 0x3cb574b2, 0x25837a58, 0xdc0921bd,
        0xd19113f9, 0x7ca92ff6, 0x94324773, 0x22f54701, 0x3ae5e581, 0x37c2dadc,
        0xc8b57634, 0x9af3dda7, 0xa9446146, 0x0fd0030e, 0xecc8c73e, 0xa4751e41,
        0xe238cd99, 0x3bea0e2f, 0x3280bba1, 0x183eb331, 0x4e548b38, 0x4f6db908,
        0x6f420d03, 0xf60a04bf, 0x2cb81290, 0x24977c79, 0x5679b072, 0xbcaf89af,
        0xde9a771f, 0xd9930810, 0xb38bae12, 0xdccf3f2e, 0x5512721f, 0x2e6b7124,
        0x501adde6, 0x9f84cd87, 0x7a584718, 0x7408da17, 0xbc9f9abc, 0xe94b7d8c,
        0xec7aec3a, 0xdb851dfa, 0x63094366, 0xc464c3d2, 0xef1c1847, 0x3215d908,
        0xdd433b37, 0x24c2ba16, 0x12a14d43, 0x2a65c451, 0x50940002, 0x133ae4dd,
        0x71dff89e, 0x10314e55, 0x81ac77d6, 0x5f11199b, 0x043556f1, 0xd7a3c76b,
        0x3c11183b, 0x5924a509, 0xf28fe6ed, 0x97f1fbfa, 0x9ebabf2c, 0x1e153c6e,
        0x86e34570, 0xeae96fb1, 0x860e5e0a, 0x5a3e2ab3, 0x771fe71c, 0x4e3d06fa,
        0x2965dcb9, 0x99e71d0f, 0x803e89d6, 0x5266c825, 0x2e4cc978, 0x9c10b36a,
        0xc6150eba, 0x94e2ea78, 0xa5fc3c53, 0x1e0a2df4, 0xf2f74ea7, 0x361d2b3d,
        0x1939260f, 0x19c27960, 0x5223a708, 0xf71312b6, 0xebadfe6e, 0xeac31f66,
        0xe3bc4595, 0xa67bc883, 0xb17f37d1, 0x018cff28, 0xc332ddef, 0xbe6c5aa5,
        0x65582185, 0x68ab9802, 0xeecea50f, 0xdb2f953b, 0x2aef7dad, 0x5b6e2f84,
        0x1521b628, 0x29076170, 0xecdd4775, 0x619f1510, 0x13cca830, 0xeb61bd96,
        0x0334fe1e, 0xaa0363cf, 0xb5735c90, 0x4c70a239, 0xd59e9e0b, 0xcbaade14,
        0xeecc86bc, 0x60622ca7, 0x9cab5cab, 0xb2f3846e, 0x648b1eaf, 0x19bdf0ca,
        0xa02369b9, 0x655abb50, 0x40685a32, 0x3c2ab4b3, 0x319ee9d5, 0xc021b8f7,
        0x9b540b19, 0x875fa099, 0x95f7997e, 0x623d7da8, 0xf837889a, 0x97e32d77,
        0x11ed935f, 0x16681281, 0x0e358829, 0xc7e61fd6, 0x96dedfa1, 0x7858ba99,
        0x57f584a5, 0x1b227263, 0x9b83c3ff, 0x1ac24696, 0xcdb30aeb, 0x532e3054,
        0x8fd948e4, 0x6dbc3128, 0x58ebf2ef, 0x34c6ffea, 0xfe28ed61, 0xee7c3c73,
        0x5d4a14d9, 0xe864b7e3, 0x42105d14, 0x203e13e0, 0x45eee2b6, 0xa3aaabea,
        0xdb6c4f15, 0xfacb4fd0, 0xc742f442, 0xef6abbb5, 0x654f3b1d, 0x41cd2105,
        0xd81e799e, 0x86854dc7, 0xe44b476a, 0x3d816250, 0xcf62a1f2, 0x5b8d2646,
        0xfc8883a0, 0xc1c7b6a3, 0x7f1524c3, 0x69cb7492, 0x47848a0b, 0x5692b285,
        0x095bbf00, 0xad19489d, 0x1462b174, 0x23820e00, 0x58428d2a, 0x0c55f5ea,
        0x1dadf43e, 0x233f7061, 0x3372f092, 0x8d937e41, 0xd65fecf1, 0x6c223bdb,
        0x7cde3759, 0xcbee7460, 0x4085f2a7, 0xce77326e, 0xa6078084, 0x19f8509e,
        0xe8efd855, 0x61d99735, 0xa969a7aa, 0xc50c06c2, 0x5a04abfc, 0x800bcadc,
        0x9e447a2e, 0xc3453484, 0xfdd56705, 0x0e1e9ec9, 0xdb73dbd3, 0x105588cd,
        0x675fda79, 0xe3674340, 0xc5c43465, 0x713e38d8, 0x3d28f89e, 0xf16dff20,
        0x153e21e7, 0x8fb03d4a, 0xe6e39f2b, 0xdb83adf7
    );

    var $arrSBox2 = array(
        0xe93d5a68, 0x948140f7, 0xf64c261c, 0x94692934, 0x411520f7, 0x7602d4f7,
        0xbcf46b2e, 0xd4a20068, 0xd4082471, 0x3320f46a, 0x43b7d4b7, 0x500061af,
        0x1e39f62e, 0x97244546, 0x14214f74, 0xbf8b8840, 0x4d95fc1d, 0x96b591af,
        0x70f4ddd3, 0x66a02f45, 0xbfbc09ec, 0x03bd9785, 0x7fac6dd0, 0x31cb8504,
        0x96eb27b3, 0x55fd3941, 0xda2547e6, 0xabca0a9a, 0x28507825, 0x530429f4,
        0x0a2c86da, 0xe9b66dfb, 0x68dc1462, 0xd7486900, 0x680ec0a4, 0x27a18dee,
        0x4f3ffea2, 0xe887ad8c, 0xb58ce006, 0x7af4d6b6, 0xaace1e7c, 0xd3375fec,
        0xce78a399, 0x406b2a42, 0x20fe9e35, 0xd9f385b9, 0xee39d7ab, 0x3b124e8b,
        0x1dc9faf7, 0x4b6d1856, 0x26a36631, 0xeae397b2, 0x3a6efa74, 0xdd5b4332,
        0x6841e7f7, 0xca7820fb, 0xfb0af54e, 0xd8feb397, 0x454056ac, 0xba489527,
        0x55533a3a, 0x20838d87, 0xfe6ba9b7, 0xd096954b, 0x55a867bc, 0xa1159a58,
        0xcca92963, 0x99e1db33, 0xa62a4a56, 0x3f3125f9, 0x5ef47e1c, 0x9029317c,
        0xfdf8e802, 0x04272f70, 0x80bb155c, 0x05282ce3, 0x95c11548, 0xe4c66d22,
        0x48c1133f, 0xc70f86dc, 0x07f9c9ee, 0x41041f0f, 0x404779a4, 0x5d886e17,
        0x325f51eb, 0xd59bc0d1, 0xf2bcc18f, 0x41113564, 0x257b7834, 0x602a9c60,
        0xdff8e8a3, 0x1f636c1b, 0x0e12b4c2, 0x02e1329e, 0xaf664fd1, 0xcad18115,
        0x6b2395e0, 0x333e92e1, 0x3b240b62, 0xeebeb922, 0x85b2a20e, 0xe6ba0d99,
        0xde720c8c, 0x2da2f728, 0xd0127845, 0x95b794fd, 0x647d0862, 0xe7ccf5f0,
        0x5449a36f, 0x877d48fa, 0xc39dfd27, 0xf33e8d1e, 0x0a476341, 0x992eff74,
        0x3a6f6eab, 0xf4f8fd37, 0xa812dc60, 0xa1ebddf8, 0x991be14c, 0xdb6e6b0d,
        0xc67b5510, 0x6d672c37, 0x2765d43b, 0xdcd0e804, 0xf1290dc7, 0xcc00ffa3,
        0xb5390f92, 0x690fed0b, 0x667b9ffb, 0xcedb7d9c, 0xa091cf0b, 0xd9155ea3,
        0xbb132f88, 0x515bad24, 0x7b9479bf, 0x763bd6eb, 0x37392eb3, 0xcc115979,
        0x8026e297, 0xf42e312d, 0x6842ada7, 0xc66a2b3b, 0x12754ccc, 0x782ef11c,
        0x6a124237, 0xb79251e7, 0x06a1bbe6, 0x4bfb6350, 0x1a6b1018, 0x11caedfa,
        0x3d25bdd8, 0xe2e1c3c9, 0x44421659, 0x0a121386, 0xd90cec6e, 0xd5abea2a,
        0x64af674e, 0xda86a85f, 0xbebfe988, 0x64e4c3fe, 0x9dbc8057, 0xf0f7c086,
        0x60787bf8, 0x6003604d, 0xd1fd8346, 0xf6381fb0, 0x7745ae04, 0xd736fccc,
        0x83426b33, 0xf01eab71, 0xb0804187, 0x3c005e5f, 0x77a057be, 0xbde8ae24,
        0x55464299, 0xbf582e61, 0x4e58f48f, 0xf2ddfda2, 0xf474ef38, 0x8789bdc2,
        0x5366f9c3, 0xc8b38e74, 0xb475f255, 0x46fcd9b9, 0x7aeb2661, 0x8b1ddf84,
        0x846a0e79, 0x915f95e2, 0x466e598e, 0x20b45770, 0x8cd55591, 0xc902de4c,
        0xb90bace1, 0xbb8205d0, 0x11a86248, 0x7574a99e, 0xb77f19b6, 0xe0a9dc09,
        0x662d09a1, 0xc4324633, 0xe85a1f02, 0x09f0be8c, 0x4a99a025, 0x1d6efe10,
        0x1ab93d1d, 0x0ba5a4df, 0xa186f20f, 0x2868f169, 0xdcb7da83, 0x573906fe,
        0xa1e2ce9b, 0x4fcd7f52, 0x50115e01, 0xa70683fa, 0xa002b5c4, 0x0de6d027,
        0x9af88c27, 0x773f8641, 0xc3604c06, 0x61a806b5, 0xf0177a28, 0xc0f586e0,
        0x006058aa, 0x30dc7d62, 0x11e69ed7, 0x2338ea63, 0x53c2dd94, 0xc2c21634,
        0xbbcbee56, 0x90bcb6de, 0xebfc7da1, 0xce591d76, 0x6f05e409, 0x4b7c0188,
        0x39720a3d, 0x7c927c24, 0x86e3725f, 0x724d9db9, 0x1ac15bb4, 0xd39eb8fc,
        0xed545578, 0x08fca5b5, 0xd83d7cd3, 0x4dad0fc4, 0x1e50ef5e, 0xb161e6f8,
        0xa28514d9, 0x6c51133c, 0x6fd5c7e7, 0x56e14ec4, 0x362abfce, 0xddc6c837,
        0xd79a3234, 0x92638212, 0x670efa8e, 0x406000e0
    );

    var $arrSBox3 = array(
        0x3a39ce37, 0xd3faf5cf, 0xabc27737, 0x5ac52d1b, 0x5cb0679e, 0x4fa33742,
        0xd3822740, 0x99bc9bbe, 0xd5118e9d, 0xbf0f7315, 0xd62d1c7e, 0xc700c47b,
        0xb78c1b6b, 0x21a19045, 0xb26eb1be, 0x6a366eb4, 0x5748ab2f, 0xbc946e79,
        0xc6a376d2, 0x6549c2c8, 0x530ff8ee, 0x468dde7d, 0xd5730a1d, 0x4cd04dc6,
        0x2939bbdb, 0xa9ba4650, 0xac9526e8, 0xbe5ee304, 0xa1fad5f0, 0x6a2d519a,
        0x63ef8ce2, 0x9a86ee22, 0xc089c2b8, 0x43242ef6, 0xa51e03aa, 0x9cf2d0a4,
        0x83c061ba, 0x9be96a4d, 0x8fe51550, 0xba645bd6, 0x2826a2f9, 0xa73a3ae1,
        0x4ba99586, 0xef5562e9, 0xc72fefd3, 0xf752f7da, 0x3f046f69, 0x77fa0a59,
        0x80e4a915, 0x87b08601, 0x9b09e6ad, 0x3b3ee593, 0xe990fd5a, 0x9e34d797,
        0x2cf0b7d9, 0x022b8b51, 0x96d5ac3a, 0x017da67d, 0xd1cf3ed6, 0x7c7d2d28,
        0x1f9f25cf, 0xadf2b89b, 0x5ad6b472, 0x5a88f54c, 0xe029ac71, 0xe019a5e6,
        0x47b0acfd, 0xed93fa9b, 0xe8d3c48d, 0x283b57cc, 0xf8d56629, 0x79132e28,
        0x785f0191, 0xed756055, 0xf7960e44, 0xe3d35e8c, 0x15056dd4, 0x88f46dba,
        0x03a16125, 0x0564f0bd, 0xc3eb9e15, 0x3c9057a2, 0x97271aec, 0xa93a072a,
        0x1b3f6d9b, 0x1e6321f5, 0xf59c66fb, 0x26dcf319, 0x7533d928, 0xb155fdf5,
        0x03563482, 0x8aba3cbb, 0x28517711, 0xc20ad9f8, 0xabcc5167, 0xccad925f,
        0x4de81751, 0x3830dc8e, 0x379d5862, 0x9320f991, 0xea7a90c2, 0xfb3e7bce,
        0x5121ce64, 0x774fbe32, 0xa8b6e37e, 0xc3293d46, 0x48de5369, 0x6413e680,
        0xa2ae0810, 0xdd6db224, 0x69852dfd, 0x09072166, 0xb39a460a, 0x6445c0dd,
        0x586cdecf, 0x1c20c8ae, 0x5bbef7dd, 0x1b588d40, 0xccd2017f, 0x6bb4e3bb,
        0xdda26a7e, 0x3a59ff45, 0x3e350a44, 0xbcb4cdd5, 0x72eacea8, 0xfa6484bb,
        0x8d6612ae, 0xbf3c6f47, 0xd29be463, 0x542f5d9e, 0xaec2771b, 0xf64e6370,
        0x740e0d8d, 0xe75b1357, 0xf8721671, 0xaf537d5d, 0x4040cb08, 0x4eb4e2cc,
        0x34d2466a, 0x0115af84, 0xe1b00428, 0x95983a1d, 0x06b89fb4, 0xce6ea048,
        0x6f3f3b82, 0x3520ab82, 0x011a1d4b, 0x277227f8, 0x611560b1, 0xe7933fdc,
        0xbb3a792b, 0x344525bd, 0xa08839e1, 0x51ce794b, 0x2f32c9b7, 0xa01fbac9,
        0xe01cc87e, 0xbcc7d1f6, 0xcf0111c3, 0xa1e8aac7, 0x1a908749, 0xd44fbd9a,
        0xd0dadecb, 0xd50ada38, 0x0339c32a, 0xc6913667, 0x8df9317c, 0xe0b12b4f,
        0xf79e59b7, 0x43f5bb3a, 0xf2d519ff, 0x27d9459c, 0xbf97222c, 0x15e6fc2a,
        0x0f91fc71, 0x9b941525, 0xfae59361, 0xceb69ceb, 0xc2a86459, 0x12baa8d1,
        0xb6c1075e, 0xe3056a0c, 0x10d25065, 0xcb03a442, 0xe0ec6e0e, 0x1698db3b,
        0x4c98a0be, 0x3278e964, 0x9f1f9532, 0xe0d392df, 0xd3a0342b, 0x8971f21e,
        0x1b0a7441, 0x4ba3348c, 0xc5be7120, 0xc37632d8, 0xdf359f8d, 0x9b992f2e,
        0xe60b6f47, 0x0fe3f11d, 0xe54cda54, 0x1edad891, 0xce6279cf, 0xcd3e7e6f,
        0x1618b166, 0xfd2c1d05, 0x848fd2c5, 0xf6fb2299, 0xf523f357, 0xa6327623,
        0x93a83531, 0x56cccd02, 0xacf08162, 0x5a75ebb5, 0x6e163697, 0x88d273cc,
        0xde966292, 0x81b949d0, 0x4c50901b, 0x71c65614, 0xe6c6c7bd, 0x327a140a,
        0x45e1d006, 0xc3f27b9a, 0xc9aa53fd, 0x62a80f00, 0xbb25bfe2, 0x35bdd2f6,
        0x71126905, 0xb2040222, 0xb6cbcf7c, 0xcd769c2b, 0x53113ec0, 0x1640e3d3,
        0x38abbd60, 0x2547adf0, 0xba38209c, 0xf746ce76, 0x77afa1c5, 0x20756060,
        0x85cbfe4e, 0x8ae88dd8, 0x7aaaf9b0, 0x4cf9aa7e, 0x1948c25c, 0x02fb8a8c,
        0x01c36ae4, 0xd6ebe1f9, 0x90d4f869, 0xa65cdea0, 0x3f09252d, 0xc208e69f,
        0xb74e6132, 0xce77e25b, 0x578fdfe3, 0x3ac372e6
    );

    var $blockSize = 8;


    public function __construct($key)
    {
        $this->arSubkeys = array(
            "P" => $this->arrP,
            "S" => array(
                $this->arrSBox0,
                $this->arrSBox1,
                $this->arrSBox2,
                $this->arrSBox3
            )
        );
        $this->__Init($key);
    }


    function __F($x)
    {
        // Divide xL into four eight-bit quarters: a, b, c, and d
        // F(xL) = ((S1[a] + S2[b] mod 232) XOR S3[c]) + S4[d] mod 232

        $d = $x & 0xff;
        $x = $x >> 8;
        $c = $x & 0xff;
        $x = $x >> 8;
        $b = $x & 0xff;
        $x = $x >> 8;
        $a = $x & 0xff;

        $y = $this->arSubkeys["S"][0][$a] + $this->arSubkeys["S"][1][$b];
        $y = ($y ^ $this->arSubkeys["S"][2][$c]) + $this->arSubkeys["S"][3][$d];

        return $y;
    }


    function __BlowfishCrypt(&$Xl, &$Xr)
    {
        // Blowfish is a Feistel network consisting of 16 rounds (see Figure 1).
        // The input is a 64-bit data element, x

        // Divide x into two 32-bit halves: xL, xR
        // For i = 1 to 16:
        //      xL = xL XOR Pi
        //      xR = F(xL) XOR xR
        //      Swap xL and xR
        // end For
        // Swap xL and xR (Undo the last swap)
        // xR = xR XOR P17
        // xL = xL XOR P18
        // Recombine xL and xR

        for ($i = 0; $i < 16; $i++)
        {
            $Xl = $Xl ^ $this->arSubkeys["P"][$i];
            $Xr = $this->__F($Xl) ^ $Xr;

            $tmp = $Xl;
            $Xl = $Xr;
            $Xr = $tmp;
        }

        $tmp = $Xl;
        $Xl  = $Xr;
        $Xr  = $tmp;

        $Xr  = $Xr ^ $this->arSubkeys["P"][16];
        $Xl  = $Xl ^ $this->arSubkeys["P"][17];
    }


    function __BlowfishDecrypt(&$Xl, &$Xr)
    {
        for ($i = 17; $i >= 2 ; $i--)
        {
            $Xl = $Xl ^ $this->arSubkeys["P"][$i];
            $Xr = $this->__F($Xl) ^ $Xr;

            $tmp = $Xl;
            $Xl = $Xr;
            $Xr = $tmp;
        }

        $tmp = $Xl;
        $Xl  = $Xr;
        $Xr  = $tmp;

        $Xr  = $Xr ^ $this->arSubkeys["P"][1];
        $Xl  = $Xl ^ $this->arSubkeys["P"][0];
    }


    function __Init($key)
    {
        $key = array_values(unpack("C*", $key));
        $keyLength = count($key);

        // XOR P[0] with the first 32 bits of the key,
        // XOR P[1] with the second 32-bits of the key,
        // and so on for all bits of the key. Repeatedly cycle through the key bits until
        // the entire P-array has been XORed with key bits.
        $j = 0;
        for ($i = 0; $i < 18; $i++)
        {
            $data = 0;
            for ($k = 0; $k < 4; $k++)
            {
                $data = ($data << 8) | $key[$j];
                $j++;
                if ($j >= $keyLength)
                    $j = 0;
            }
            $this->arSubkeys["P"][$i] = $this->arrP[$i] ^ $data;
        }

        // Encrypt the all-zero string with the Blowfish algorithm,
        // replace P1 and P2 with the encrypted data,
        // encrypt P3 and P4 with the new P1 and P2,
        // continue the process, replacing all entries of the P- array, and then all four
        // S-boxes in order, with the output of the continuously-changing Blowfish algorithm
        $datal = 0;
        $datar = 0;
        for ($i = 0; $i < 18; $i += 2)
        {
            $this->__BlowfishCrypt($datal, $datar);
            $this->arSubkeys["P"][$i] = $datal;
            $this->arSubkeys["P"][$i + 1] = $datar;
        }

        for ($i = 0; $i < 4; $i++)
        {
            for ($j = 0; $j < 256; $j += 2)
            {
                 $this->__BlowfishCrypt($datal, $datar);
                 $this->arSubkeys["S"][$i][$j] = $datal;
                 $this->arSubkeys["S"][$i][$j + 1] = $datar;
            }
        }
    }


    function __Encrypt($block)
    {
        $data = array_values(unpack('N*', $block));
        $this->__BlowfishCrypt($data[0], $data[1]);
        return pack('N*', $data[0], $data[1]);
    }


    function __Decrypt($block)
    {
        $data = array_values(unpack('N*', $block));
        $this->__BlowfishDecrypt($data[0], $data[1]);
        return pack('N*', $data[0], $data[1]);
    }
}

/************************************************************************************/
/************   RC4   ***************************************************************/
/************************************************************************************/
class CCryptrc4
{
    var $arKey = array();
    var $arBox = array();

    var $blockSize = 0;


    public function __construct($key)
    {
        $this->__Init($key);
    }


    function __Init($key)
    {
        $this->arKey[] = "";
        $this->arBox[] = "";

        $keyLength = strlen($key);

        for ($i = 0; $i < 256; $i++)
        {
            $this->arKey[$i] = ord(substr($key, ($i % $keyLength), 1));
            $this->arBox[$i] = $i;
        }

        for ($j = $i = 0; $i < 256; $i++)
        {
            $j = ($j + $this->arBox[$i] + $this->arKey[$i]) % 256;
            $this->arBox[$i] ^= $this->arBox[$j];
            $this->arBox[$j] ^= $this->arBox[$i];
            $this->arBox[$i] ^= $this->arBox[$j];
        }
    }

    function __Process($block)
    {
        $data = "";
        $blockLength = strlen($block);

        for ($a = $j = $i = 0; $i < $blockLength; $i++)
        {
            $a = ($a + 1) % 256;
            $j = ($j + $this->arBox[$a]) % 256;

            $this->arBox[$a] ^= $this->arBox[$j];
            $this->arBox[$j] ^= $this->arBox[$a];
            $this->arBox[$a] ^= $this->arBox[$j];

            $k = $this->arBox[(($this->arBox[$a] + $this->arBox[$j]) % 256)];
            $data .= chr(ord(substr($block, $i, 1)) ^ $k);
        }

        return $data;
    }


    function __Encrypt($block)
    {
        return $this->__Process($block);
    }


    function __Decrypt($block)
    {
        return $this->__Process($block);
    }
}