DLMF - library for decrypting container files (rsdf, ccf, ncf and dlc)

[bluefrogx]

DLC

function decrypt_dlc($str_filename, $return_array)
{
    if(!isset($str_filename) || !isset($return_array) || empty($str_filename) || empty($str_filename) || !file_exists($str_filename))
        die("Pass correct parameter");
    
    $return_array ? $links = array() : $links = '';
    
    $key = 'xxxx';
    $IV = 'xxxx';
    
    $dlc_whole_content = file_get_contents($str_filename);
    
    $dlc_content = substr($dlc_whole_content, 0, -88);     //base64 encoded dlc content
    $dlc_content = base64_decode($dlc_content);         //dlc content
    $dlc_key = substr($dlc_whole_content, -88);         //dlc key

    /*
     * Send an HTTP-Request, remove <rc> and </rc> of response and decode it with base64
     */
    $result = file_get_contents("http://service.jdownloader.org/dlcrypt/service.php?destType=load&srcType=dlc&data=$dlc_key");
    $result = explode("<rc>", $result);
    $result = explode("</rc>",$result[1]);
    $result = $result[0];
    $result = base64_decode($result);
    
    if(empty($result))
        die("Got wrong or no response from server!");

    /*
     * Decrypt the base64 decoded server response
     * (128 Bit AES in CBC mode with your key and IV)
     */
    $hdlDLCCrypt = mcrypt_module_open(MCRYPT_RIJNDAEL_128,'','cbc','');
    @mcrypt_generic_init($hdlDLCCrypt,$key,$IV);
    $dlckey = mdecrypt_generic($hdlDLCCrypt, $result);
    
    /*
     * Decrypt your content
     * (128 Bit AES in CBC mode with your previously decrypted result as key and IV)
     */
    $hdlDLCCrypt = mcrypt_module_open(MCRYPT_RIJNDAEL_128,'','cbc','');
    @mcrypt_generic_init($hdlDLCCrypt,$dlckey,$dlckey);
    $data = mdecrypt_generic($hdlDLCCrypt, $dlc_content);
    $data = base64_decode($data);

    /*
     * Simple and dirty XML parsing
     */
    $parser = xml_parser_create();
    xml_parse_into_struct($parser, $data, $vals);
    xml_parser_free($parser);

    for($i = 0;; ++$i)
    {
        if($vals[$i]["tag"] == "DLC" && $vals[$i]["type"] == "close") // break at </dlc> (end of dlc content)
            break;
            
        if($vals[$i]["tag"] == "URL") // filter the links
        {
            /*
             * <dlc>[...]<url>___LINKS___</url>[...]</dlc>
             */
            
            $return_array 
            ? $links[] = base64_decode($vals[$i]["value"])         // append link to array
            : $links .= base64_decode($vals[$i]["value"])."\n";    // append link to string
        }
    }
    return $links;
}