public static void UpdateCommonKey(KeyExchangeDto previous = null)
{
int myIndex = CURRENT_CHAT.Members.FindIndex(member => member.Equals(ME));
int nextIndex = (myIndex + 1) % CURRENT_CHAT.Members.Count;
if (myIndex == nextIndex)
{
throw new ConflictException("sender loop");
}
MemberDto nextMember = CURRENT_CHAT.Members[nextIndex];
KeyExchangeDto dto = dto = new KeyExchangeDto();
if (previous == null)
{
dto.KeyTemp = USER_CHAT_KEYS[CURRENT_CHAT.Name].PublicKey;
}
else
{
dto.KeyTemp = DIFFIE.GetCommonPrivateKey(
previous.KeyTemp,
USER_CHAT_KEYS[CURRENT_CHAT.Name].PrivateKey,
CURRENT_CHAT.P
);
dto.TTL = previous.TTL + 1;
}
MoveCursorToEnd();
ConsoleWriteLine($"Key exchange with user on port {nextMember.Port}");
KeyExchangeAction action = new KeyExchangeAction(dto);
USER_NOTIFIERS[nextMember.Name].Send(action);
}
private static void ServerListener_Recieved(object sender, Listener.RecieveEventArgs e)
{
string json = Encoding.UTF8.GetString(e.Data);
SocketActionBase action = JsonConvert.DeserializeObject <SocketActionBase>(json);
//ConsoleWriteLine($"Recieved {json} via sockets");
switch (action.Action)
{
case SocketActions.JOIN:
MemberDto member = JsonConvert.DeserializeObject <MemberDto>(JsonConvert.SerializeObject(action.Data));
ConsoleWriteLine($"{member.Name} joined chat");
if (!CURRENT_CHAT.Members.Contains(member))
{
CURRENT_CHAT.Members.Add(member);
}
if (!member.Equals(ME))
{
ConnectTo(member);
}
UpdateCommonKey();
break;
case SocketActions.KEY_UPDATE:
KeyExchangeDto keyExchange = JsonConvert.DeserializeObject <KeyExchangeDto>(JsonConvert.SerializeObject(action.Data));
if (keyExchange.TTL + 1 == CURRENT_CHAT.Members.Count)
{
CURRENT_CHAT_COMMON_KEY = DIFFIE.GetCommonPrivateKey(
keyExchange.KeyTemp,
USER_CHAT_KEYS[CURRENT_CHAT.Name].PrivateKey,
CURRENT_CHAT.P
);
ConsoleWriteLine($"Got common key: {CURRENT_CHAT_COMMON_KEY}");
}
else
{
UpdateCommonKey(keyExchange);
}
break;
case SocketActions.MESSAGE:
Message message = JsonConvert.DeserializeObject <Message>(JsonConvert.SerializeObject(action.Data));
string textCode = NOTEPAD.Decode(message.MessageText, CURRENT_CHAT_COMMON_KEY);
string text = NOTEPAD.GetCodeText(textCode);
ConsoleWriteLine($"{message.SenderName}: {text} ({message.TimeStamp.ToShortTimeString()})");
break;
}
}
public KeyExchangeAction(KeyExchangeDto dto)
{
Action = SocketActions.KEY_UPDATE;
Data = dto;
}
