private static void DecryptFile(string filepath)
{
Console.WriteLine("-------------------------");
Console.WriteLine("File: " + Path.GetFileName(filepath));
Console.WriteLine("-------------------------");
Console.WriteLine("Encrypt as flash object? (Y/N)");
bool isFlashObj = Console.ReadLine().Trim().ToLower() == "y";
string filename = Path.GetFileNameWithoutExtension(filepath);
// Base64 decode
byte[] encodedBuf;
using (MemoryStream ms = new MemoryStream(File.ReadAllBytes(filepath))) {
FromBase64Transform trans = new FromBase64Transform();
using (CryptoStream cryptStream = new CryptoStream(ms, trans, CryptoStreamMode.Read)) {
byte[] buf = new byte[1024];
int read = 0;
using (MemoryStream msResult = new MemoryStream()) {
do
{
read = cryptStream.Read(buf, 0, buf.Length);
if (read > 0)
{
msResult.Write(buf, 0, read);
}
} while (read > 0);
encodedBuf = msResult.ToArray();
}
}
}
// Flash objects needs to be pulled via Flash Decompiler..
if (isFlashObj)
{
string flashObjPath = Path.Combine(Directory.GetCurrentDirectory(), filename + ".swf");
if (File.Exists(flashObjPath))
{
File.Delete(flashObjPath);
}
File.WriteAllBytes(flashObjPath, encodedBuf);
Console.WriteLine("Data exported to \"" + Path.GetFileName(flashObjPath) + "\"");
Console.Read();
return;
}
// Decrypt real XML using BlowFish algo
string keyFromDummyAs = "O99vUyAPaGXHNo";
using (MemoryStream streamDataEncoded = new MemoryStream(encodedBuf)) {
var keyData = Encoding.UTF8.GetBytes(keyFromDummyAs);
var pkcs = new PKCS5();
var blowKey = new BlowFishKey(keyData);
var ecbMode = new ECBMode(blowKey, pkcs);
pkcs.BlockSize = ecbMode.BlockSize;
byte[] bufFinal = ecbMode.Decrypt(streamDataEncoded);
string xmlPath = Path.Combine(Directory.GetCurrentDirectory(), filename + ".xml");
if (File.Exists(xmlPath))
{
File.Delete(xmlPath);
}
File.WriteAllBytes(xmlPath, bufFinal);
}
}
public ECBMode(BlowFishKey bKey, PKCS5 pkcs5)
{
mKey = bKey;
mPadding = pkcs5;
mPadding.BlockSize = mKey.BlockSize;
}