/*
 * DLC (Download Link Container) Decrypter in PHP
 *
 * @param $str_filename path to dlc file
 * @param $return_array return links in an array or as a string seperated by a new-line character
 *
 * @author
 * 	Christian Lange - <Christian_Lange@hotmail.com> <chlange@htwg-konstanz.de>
 *
 * @link
 *	http://www.ganz-sicher.net/chlange
 *
 * @date
 * 	03 November 2010
 */
function decrypt_dlc($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;
}