how to decrypt and decode png files to real file (.ass)

[gaaara]

Hi,

I have an coded and encrypted .png file that I would like to decrypt and decode using an « ActionScript » fonction.

I know it’s coded using « basse64 » but I have no ideas what it is encrypted with. This fonction has what it takes to decrypt and decode and I want to use it to get the original .ass file.

I don’t have all the informations but I really am looking forward to make this all work.

Step #1 : Discovery of the encryption
Step #2 : Make the modifications to use the fonction to grab the .ass file.

public static function decryptSubtitle(param1:String, param2:String = "5463201897") : String {
var _loc_7:String = null;
var _loc_8:int = 0;
var _loc_9:int = 0;
var _loc_10:int = 0;
var _loc_3:* = new ByteArray();
var _loc_4:String = "";
var _loc_5:int = 0;
while (_loc_5 < param1.length)
{

_loc_7 = param1.substr(_loc_5, 1);
_loc_8 = parseInt(param2.substr(_loc_5 % param2.length - 1, 1));
_loc_9 = _loc_7.charCodeAt(0);
_loc_10 = _loc_9 - _loc_8;
_loc_7 = String.fromCharCode(_loc_10);
_loc_4 = _loc_4 + _loc_7;
_loc_5++;
}
var _loc_6:* = Base64.decode(_loc_4).replace(/?»?""?»?/, "");
_loc_3.writeMultiByte(_loc_6, "iso-8859-1");
return _loc_3.toString();
}// end function

link for this files animedigitalnetwork dot fr/picture_3615.png
A++