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);
}
public static byte[] Encrypt(byte[] Payload, int Id, int Version, KeyPair keyPair)
{
if (!Form1.Config.UseRC4)
{
switch (Id)
{
case 10100:
encryptedPayload = Payload;
break;
case 10101:
ClientConfig.Nonce = GenericHash.Hash(keyPair.PublicKey.Concat(Keys.ServerKey).ToArray(), null, 24);
ClientConfig.SNonce = Utils.GenerateRandomBytes(24);
Payload = ClientConfig.SessionKey.Concat(ClientConfig.SNonce).Concat(Payload).ToArray();
encryptedPayload = PublicKeyBox.Create(Payload, ClientConfig.Nonce, keyPair.PrivateKey, Keys.ServerKey);
encryptedPayload = keyPair.PublicKey.Concat(encryptedPayload).ToArray();
Console.WriteLine(BitConverter.ToString(ClientConfig.Nonce).Replace("-", ""));
Console.WriteLine(BitConverter.ToString(ClientConfig.SNonce).Replace("-", ""));
Console.WriteLine(BitConverter.ToString(ClientConfig.SessionKey).Replace("-", ""));
break;
default:
ClientConfig.SNonce = Utilities.Increment(Utilities.Increment(ClientConfig.SNonce));
encryptedPayload = SecretBox.Create(Payload, ClientConfig.SNonce, ClientConfig.SharedKey);
Console.WriteLine($"Encrypted ID: {Id} with Nonce: {BitConverter.ToString(ClientConfig.SNonce).Replace("-", "")}");
break;
}
}
else if (Form1.Config.UseRC4)
{
encryptedPayload = RC4.Encrypt(Payload);
}
else
{
}
byte[] packet = BitConverter.GetBytes(Id).Reverse().Skip(2).Concat(BitConverter.GetBytes(encryptedPayload.Length).Reverse().Skip(1)).Concat(BitConverter.GetBytes(Version).Reverse().Skip(2)).Concat(encryptedPayload).ToArray();
return(packet);
}
