// with unity header
public static void EncryptFile(String file)
{
var fileName = Path.GetFileNameWithoutExtension(file);
var unityBlob = new List <Byte>();
unityBlob.AddRange(BitConverter.GetBytes(fileName.Length));
unityBlob.AddRange(Encoding.ASCII.GetBytes(fileName));
var pad = 8 - ((unityBlob.Count - 1) % 8) - 1;
unityBlob.AddRange(Enumerable.Range(0, pad).Select(i => (Byte)0).ToList());
var bytes = File.ReadAllBytes(file).ToList();
var size = bytes.Count;
pad = 8 - ((bytes.Count - 1) % 8) - 1;
bytes.AddRange(Enumerable.Range(0, pad).Select(i => (Byte)0).ToList());
var cipher = new ROMDesCipher(ROMKey, 8);
var encryptedBytes = cipher.Encrypt(bytes.ToArray());
var payload = new List <Byte>();
payload.AddRange(Encoding.ASCII.GetBytes(ROMSig));
payload.AddRange(BitConverter.GetBytes(size));
payload.AddRange(encryptedBytes);
unityBlob.AddRange(BitConverter.GetBytes(payload.Count));
unityBlob.AddRange(payload);
File.WriteAllBytes(file.replace(".lua", "") + ".bytes", unityBlob.ToArray());
}
// without unity header
public static void DecryptFile(String file)
{
var fileBytes = File.ReadAllBytes(file);
var header = fileBytes.Take(12);
var signature = header.Take(8);
if (Encoding.ASCII.GetString(signature.ToArray()) != ROMSig)
{
throw new Exception("not a valid ROM payload");
}
var size = BitConverter.ToInt32(header.Skip(8).ToArray(), 0);
var encryptedBytes = fileBytes.Skip(12).ToArray();
var cipher = new ROMDesCipher(ROMKey, 8);
var decryptedBytes = cipher.Decrypt(encryptedBytes);
File.WriteAllBytes(file.replace(".bytes", "") + ".lua", decryptedBytes.Take(size).ToArray());
}
