private static void HandleAkep2Message2(SksMessageReceivedEventArgs sksMessageReceivedEventArgs)
{
var user = GetUserByIpAndPort(sksMessageReceivedEventArgs.FromIp, sksMessageReceivedEventArgs.FromPort);
Akep2 akep2;
lock (akep2sLock)
{
akep2 = Akep2s.FirstOrDefault(a => a.User == user);
}
if (akep2 == null)
{
return;
}
var message = Akep2Message2.FromString(sksMessageReceivedEventArgs.Message, user.Key);
akep2.NonceB = message.NonceB;
var newMessage = new Akep2Message3(MyUsername, akep2.NonceB, user.Key);
user.SendMessage(newMessage.ToString());
akep2.IncrementMessageCount();
}
private static void HandleChatMessage(SksMessageReceivedEventArgs sksMessageReceivedEventArgs)
{
var user = GetUserByIpAndPort(sksMessageReceivedEventArgs.FromIp, sksMessageReceivedEventArgs.FromPort);
var message = ChatMessage.FromString(sksMessageReceivedEventArgs.Message);
var secret = user.GetSecretFromProtocol();
var messageStr = SksAes.DecryptStringFromBytes_Aes(message.EncryptedMessageBytes, secret, message.Iv);
user.Client.OnChatMessageReceived(user.Client.tcpClient, messageStr);
}
private static void Client_MessageReceived(object source, SksMessageReceivedEventArgs sksMessageReceivedEventArgs)
{
var client = (SksClient)source;
if (client.Type == SksClientType.Local)
{
LocalClientMessageReceived(sksMessageReceivedEventArgs);
}
else if (client.Type == SksClientType.Remote)
{
RemoteClientMessageReceived(sksMessageReceivedEventArgs);
}
}
private static void HandleHandshakeMessage2(SksMessageReceivedEventArgs sksMessageReceivedEventArgs)
{
var user = GetUserByIpAndPort(sksMessageReceivedEventArgs.FromIp, sksMessageReceivedEventArgs.FromPort);
Handshake handshake;
lock (handshakesLock)
{
handshake = Handshakes.FirstOrDefault(h => h.User == user);
}
if (handshake == null)
{
Logger.Log(LogTag, "ERROR: Handshake message 2 - handshake doesn't exist");
return;
}
var message = HandshakeMessage2.FromString(sksMessageReceivedEventArgs.Message);
user.Protocol = message.ProtocolId;
switch (message.ProtocolId)
{
case ProtocolType.None:
break;
case ProtocolType.Akep2:
InitAkep2(user, SksClientType.Local);
break;
case ProtocolType.LamportScheme:
InitLamportScheme(user, SksClientType.Local);
break;
case ProtocolType.OtwayRees:
break;
case ProtocolType.Rsa:
break;
default:
throw new ArgumentOutOfRangeException();
}
}
private static void HandleAkep2Message3(SksMessageReceivedEventArgs sksMessageReceivedEventArgs)
{
var user = GetUserByIpAndPort(sksMessageReceivedEventArgs.FromIp, sksMessageReceivedEventArgs.FromPort);
Akep2 akep2;
lock (akep2sLock)
{
akep2 = Akep2s.FirstOrDefault(a => a.User == user);
}
if (akep2 == null)
{
return;
}
var message = Akep2Message3.FromString(sksMessageReceivedEventArgs.Message, user.Key);
akep2.IncrementMessageCount();
}
private static void HandleAkep2Message1(SksMessageReceivedEventArgs sksMessageReceivedEventArgs)
{
var user = GetUserByIpAndPort(sksMessageReceivedEventArgs.FromIp, sksMessageReceivedEventArgs.FromPort);
var akep2 = InitAkep2(user, SksClientType.Remote);
if (akep2 == null)
{
return;
}
var message = Akep2Message1.FromString(sksMessageReceivedEventArgs.Message);
akep2.NonceA = message.NonceA;
akep2.NonceB = Utils.GenerateRandom16();
var newMessage = new Akep2Message2(MyUsername, user.Name, akep2.NonceA, akep2.NonceB, user.Key);
user.SendMessage(newMessage.ToString());
akep2.IncrementMessageCount();
}
private static void HandleHandshakeMessage1(SksMessageReceivedEventArgs sksMessageReceivedEventArgs)
{
var user = GetUserByIpAndPort(sksMessageReceivedEventArgs.FromIp, sksMessageReceivedEventArgs.FromPort);
Handshake handshake;
lock (handshakesLock)
{
handshake = Handshakes.FirstOrDefault(h => h.User == user);
}
if (handshake != null)
{
Logger.Log(LogTag, "ERROR: Handshake message 1 - handshake already existed");
return;
}
handshake = InitHandshake(user, SksClientType.Remote);
if (handshake == null)
{
return;
}
var message = HandshakeMessage1.FromString(sksMessageReceivedEventArgs.Message);
user.Protocol = Utils.DetermineProtocol(user);
if (user.Protocol == ProtocolType.LamportScheme)
{
InitLamportScheme(user, SksClientType.Remote);
}
var newMessage = new HandshakeMessage2(user.Protocol, null);
user.SendMessage(newMessage.ToString());
handshake.IncrementMessageCount();
}
private static void HandleHandshakeMessage4(SksMessageReceivedEventArgs sksMessageReceivedEventArgs)
{
// todo: ukoncenie komunikacie
}
public static void HandleMessage(SksMessageReceivedEventArgs sksMessageReceivedEventArgs)
{
var messageType = PemParser.GetMessageType(sksMessageReceivedEventArgs.Message);
// todo: doriesit otway reese
switch (messageType)
{
case PemMessageType.LongTermKey:
break;
case PemMessageType.InitialMessage1:
break;
case PemMessageType.InitialMessage2:
break;
case PemMessageType.ErrorMessage:
break;
case PemMessageType.ChatMessage:
HandleChatMessage(sksMessageReceivedEventArgs);
break;
case PemMessageType.Akep2Message1:
HandleAkep2Message1(sksMessageReceivedEventArgs);
break;
case PemMessageType.Akep2Message2:
HandleAkep2Message2(sksMessageReceivedEventArgs);
break;
case PemMessageType.Akep2Message3:
HandleAkep2Message3(sksMessageReceivedEventArgs);
break;
case PemMessageType.OtwayReesMessage1:
break;
case PemMessageType.OtwayReesMessage2:
//HandleOtwayReeseMessage2(sksMessageReceivedEventArgs);
break;
case PemMessageType.OtwayReesMessage3:
break;
case PemMessageType.OtwayReesMessage4:
//HandleOtwayReeseMessage4(sksMessageReceivedEventArgs);
break;
case PemMessageType.HandshakeMessage1:
HandleHandshakeMessage1(sksMessageReceivedEventArgs);
break;
case PemMessageType.HandshakeMessage2:
HandleHandshakeMessage2(sksMessageReceivedEventArgs);
break;
case PemMessageType.HandshakeMessage3:
HandleHandshakeMessage3(sksMessageReceivedEventArgs);
break;
case PemMessageType.HandshakeMessage4:
HandleHandshakeMessage4(sksMessageReceivedEventArgs);
break;
case PemMessageType.SshTlsMessage1:
break;
case PemMessageType.SshTlsMessage2:
break;
case PemMessageType.SshTlsMessage3:
break;
default:
throw new ArgumentOutOfRangeException();
}
}
private static void RemoteClientMessageReceived(SksMessageReceivedEventArgs sksMessageReceivedEventArgs)
{
HandleMessage(sksMessageReceivedEventArgs);
}