public static byte[] Decrypt(byte[] Payload, KeyPair keyPair)
{
ushort Id;
int Length;
ushort Version;
using (Reader reader = new Reader(Payload))
{
Id = reader.ReadUInt16();
Length = reader.ReadInt24();
Version = reader.ReadUInt16();
Payload = Payload.Skip(2).Skip(3).Skip(2).ToArray();
}
if (!Form1.Config.UseRC4)
{
switch (Id)
{
case 20100:
decryptedPayload = Payload;
break;
case 20103:
decryptedPayload = Payload;
break;
case 20104:
ClientConfig.ServerNonce = GenericHash.Hash(ClientConfig.SNonce.Concat(keyPair.PublicKey).Concat(Keys.ServerKey).ToArray(), null, 24);
decryptedPayload = PublicKeyBox.Open(Payload, ClientConfig.ServerNonce, keyPair.PrivateKey, Keys.ServerKey);
ClientConfig.RNonce = decryptedPayload.Take(24).ToArray();
ClientConfig.SharedKey = decryptedPayload.Skip(24).Take(32).ToArray();
decryptedPayload = decryptedPayload.Skip(24).Skip(32).ToArray();
break;
default:
ClientConfig.RNonce = Utilities.Increment(Utilities.Increment(ClientConfig.RNonce));
byte[] toDecrypt = new byte[16].Concat(Payload).ToArray();
decryptedPayload = SecretBox.Open(toDecrypt, ClientConfig.RNonce, ClientConfig.SharedKey);
Logger.Write(Encoding.UTF8.GetString(decryptedPayload), "Decrypted OHD");
break;
}
}
else if (Form1.Config.UseRC4)
{
decryptedPayload = RC4.Decrypt(Payload);
}
else
{
}
return(decryptedPayload);
}
