static void DecryptFile(string inkey, string inflag, string inres, string outfile)
{
var key = new MV2.Key(File.ReadAllBytes(inkey));
var decoder = new MV2.Decoder(key);
var flag = File.ReadAllBytes(inflag);
var res = File.ReadAllBytes(inres);
File.WriteAllBytes(outfile, decoder.Decode(flag, res));
}
static void EncryptFile(string inkey, string infile, string outflag, string outres)
{
var key = new MV2.Key(File.ReadAllBytes(inkey));
var encoder = new MV2.Encoder(key, rounds: 16);
var result = encoder.Encode(File.ReadAllBytes(infile));
File.WriteAllBytes(outflag, result.Flag);
File.WriteAllBytes(outres, result.Residual);
}