Language: Java
private String decrypt(String str_hex, String str_key1, String str_key2) {
        // http://wordrider.net/forum/read.php?10,3209,3212#msg-3212
 
        // 1. Convert hexadecimal string to binary string
        char[] chr_hex = str_hex.toCharArray();
        String str_bin = "";
        for(int i = 0; i < 32; i++) {
            String temp1 = Integer.toBinaryString(Integer.parseInt(Character.toString(chr_hex[i]), 16));
            while (temp1.length() < 4) {
                temp1 = "0" + temp1;
            }
            str_bin += temp1;
        }
        char[] chr_bin = str_bin.toCharArray();
 
        // 2. Generate switch and XOR keys
        int key1 = Integer.parseInt(str_key1);
        int key2 = Integer.parseInt(str_key2);
        int[] key = new int[384];
        for (int i = 0; i < 384; i++) {
            key1 = (key1 * 11 + 77213) % 81371;
            key2 = (key2 * 17 + 92717) % 192811;
            key[i] = (key1 + key2) % 128;
        }
 
        // 3. Switch bits positions
        for (int i = 256; i >= 0; i--) {
            char temp3 = chr_bin[key[i]];
            chr_bin[key[i]] = chr_bin[i%128];
            chr_bin[i%128] = temp3;
        }
 
        // 4. XOR entire binary string
        for (int i = 0; i < 128; i++) {
            chr_bin[i] = (char)(chr_bin[i] ^ key[i+256] & 1);
        }
 
        // 5. Convert binary string back to hexadecimal
        str_bin = new String(chr_bin);
        str_hex = "";
        for(int i = 0; i < 128; i+=4) {
            str_hex += Integer.toHexString(Integer.parseInt(str_bin.substring(i, i+4), 2));
        }
 
        // 6. Return counted string
        return str_hex;
    }

Language: Java
decrypt("adae225909bb6c445fe27aa919386454", "34233", "51162")

Language: Java
"e54017d16ca68e8a9127a38731cd7173"

Language: Java
private String decrypt(String str_hex, String str_key1, String str_key2){
        char[] chr_hex = str_hex.toCharArray();
 
        // 1. Convert hexadecimal string to binary string
        String str_bin = "";
        for(int i = 0; i < 32; i++){
            str_bin += Integer.toBinaryString(Integer.parseInt(Character.toString(chr_hex[i]), 16));
        }
        char[] chr_bin = str_bin.toCharArray();
 
        // 2. Generate switch and XOR keys
        int key1 = Integer.parseInt(str_key1);
        int key2 = Integer.parseInt(str_key2);
        int[] key = new int[384];
        for (int i = 0; i < 384; i++){
            key1 = (key1 * 11 + 77213) % 81371;
            key2 = (key2 * 17 + 92717) % 192811;
            key[i] = (key1 + key2) % 128;
        }
 
        // 3. Switch bits positions
        char temp;
        for (int i = 256; i >= 0; i--){
            logger.info(Integer.toString(i));
            temp = chr_bin[key[i]];
            chr_bin[key[i]] = chr_bin[i%128];
            chr_bin[i%128] = temp;
        }
 
        //etc...
}

Language: Java
decrypt("c4b77e65a4c1e33bf0f8571c69d69027", "73692", "147815")

Language: PHP
<?php
// Vadi_G Megavideo Flv Finder PHP
 
function mv_decrypt($str_hex, $key1, $key2){
$str_bin = "";
// 1. Convert hexadecimal string to binary string
for($i = 0; $i < 128; $i++){
$str_bin .= floor(hexdec($str_hex[floor($i/4)])/pow(2,(3-($i%4))))%2;
}
// 2. Generate switch and XOR keys
$key = Array();
for ($i = 0; $i < 384; $i++){
$key1 = ($key1 * 11 + 77213) % 81371;
$key2 = ($key2 * 17 + 92717) % 192811;
$key[$i] = ($key1 + $key2) % 128;
}
// 3. Switch bits positions
for ($i = 256; $i >= 0; $i--){
$temp = $str_bin[$key[$i]];
$str_bin[$key[$i]] = $str_bin[$i%128];
$str_bin[$i%128] = $temp;
}
// 4. XOR entire binary string
for ($i = 0; $i < 128; $i++){
$str_bin[$i] = $str_bin[$i] ^ $key[$i+256] & 1;
}
// 5. Convert binary string back to hexadecimal
$str_hex = "";
for($i = 0; $i < 32; $i++){
$str_hex .= dechex(bindec(substr($str_bin, $i*4, 4)));
}
// 6. Return counted string
return $str_hex;
}
 
// Is set the "file" variable?
if(isset($_GET["file"])){
// Does player send video position?
$pos = (isset($_GET["pos"]) ? intval($_GET["pos"]) : "");
//Obtain Megavideo ID from link
$megavideo_id = $_GET["file"];
// Obtain Megavideo XML playlist file
if ($content = @file_get_contents("http://www.megavideo.com/xml/videolink.php?v=".$megavideo_id)){
// Parameters which I want to obtain from XML;
$parameters = Array("un", "k1", "k2", "s", "size");
$success = true;
// Obtain parameters from XML one by one
for($i=0; $i<Count($parameters); $i++){
 $success = $success && preg_match('/ ' . $parameters[$i] . '="([^"]+)"/', $content, $match);
 $$parameters[$i] = $match[1];
 }
 if($success){
 // Count "dkey" from obtained parameters
 $dkey=mv_decrypt($un,$k1,$k2);
 // set URL address of video file
 $video_url = "http://www".$s.".megavideo.com/files/".$dkey."/".$pos;
 // Send headers to browser
 header("Content-Type: video/flv");
 header("Content-Disposition: attachment; filename=video.flv;" );
 header("Content-Length: ".$size);
 // Read video file from Megavideo server
 readfile($video_url);
 }
 }
 }
 ?>