public static void receive(int bytesReceived, Socket socket, State state)
{
int bytesRead = 0;
int payloadLength, bytesAvailable, bytesNeeded;
while (bytesRead < bytesReceived)
{
bytesAvailable = bytesReceived - bytesRead;
if (bytesReceived > 0)
{
if (state.packet.Length >= 7)
{
payloadLength = BitConverter.ToInt32(new byte[1].Concat(state.packet.Skip(2).Take(3)).Reverse().ToArray(), 0);
bytesNeeded = payloadLength - (state.packet.Length - 7);
if (bytesAvailable >= bytesNeeded)
{
state.packet = state.packet.Concat(state.buffer.Skip(bytesRead).Take(bytesNeeded)).ToArray();
bytesRead += bytesNeeded;
bytesAvailable -= bytesNeeded;
if (state.GetType() == typeof(ClientState))
{
ClientCrypto.DecryptPacket(socket, (ClientState)state, state.packet);
}
else if (state.GetType() == typeof(ServerState))
{
ServerCrypto.DecryptPacket(socket, (ServerState)state, state.packet);
}
state.packet = new byte[0];
}
else
{
state.packet = state.packet.Concat(state.buffer.Skip(bytesRead).Take(bytesAvailable)).ToArray();
bytesRead = bytesReceived;
bytesAvailable = 0;
}
}
else if (bytesAvailable >= 7)
{
state.packet = state.packet.Concat(state.buffer.Skip(bytesRead).Take(7)).ToArray();
bytesRead += 7;
bytesAvailable -= 7;
}
else
{
state.packet = state.packet.Concat(state.buffer.Skip(bytesRead).Take(bytesAvailable)).ToArray();
bytesRead = bytesReceived;
bytesAvailable = 0;
}
}
}
}
public static void DecryptPacket(Socket socket, ServerState state, byte[] packet)
{
int messageId = BitConverter.ToInt32(new byte[2].Concat(packet.Take(2)).Reverse().ToArray(), 0);
int payloadLength = BitConverter.ToInt32(new byte[1].Concat(packet.Skip(2).Take(3)).Reverse().ToArray(), 0);
int unknown = BitConverter.ToInt32(new byte[2].Concat(packet.Skip(2).Skip(3).Take(2)).Reverse().ToArray(), 0);
byte[] cipherText = packet.Skip(2).Skip(3).Skip(2).ToArray();
byte[] plainText;
if (messageId == 10100)
{
plainText = cipherText;
}
else if (messageId == 10101)
{
state.clientKey = cipherText.Take(32).ToArray();
byte[] nonce = GenericHash.Hash(state.clientKey.Concat(state.serverKey.PublicKey).ToArray(), null, 24);
cipherText = cipherText.Skip(32).ToArray();
plainText = PublicKeyBox.Open(cipherText, nonce, state.serverKey.PrivateKey, state.clientKey);
state.sessionKey = plainText.Take(24).ToArray();
state.clientState.nonce = plainText.Skip(24).Take(24).ToArray();
plainText = plainText.Skip(24).Skip(24).ToArray();
}
else
{
state.clientState.nonce = Utilities.Increment(Utilities.Increment(state.clientState.nonce));
plainText = SecretBox.Open(new byte[16].Concat(cipherText).ToArray(), state.clientState.nonce, state.sharedKey);
}
try
{
JObject decoded = state.decoder.decode(messageId, unknown, plainText);
Console.WriteLine("{0}: {1}", decoded["name"], decoded["fields"]);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
Console.WriteLine("{0} {1}", messageId, Utilities.BinaryToHex(BitConverter.GetBytes(messageId).Reverse().Skip(2).Concat(BitConverter.GetBytes(plainText.Length).Reverse().Skip(1)).Concat(BitConverter.GetBytes(unknown).Reverse().Skip(2)).Concat(plainText).ToArray()));
}
ClientCrypto.EncryptPacket(state.clientState.socket, state.clientState, messageId, unknown, plainText);
}
