/// <summary>
/// Metoda słuzaca do rozlaczenia aktualnej rozmowy
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void DisconnectBtn_Click(object sender, EventArgs e)
{
if (isChatOpen)
{
//Disconnect
SendBtn.Enabled = false;
MsgTextBox.Enabled = false;
isChatOpen = false;
EnableDisableControls(true);
this.MsgTextBox.Enabled = false;
this.SendBtn.Enabled = false;
this.DisconnectBtn.Enabled = false;
CryptoModule.RemoveUserKey(loginToConnect);
cm.Send(Encoding.UTF8.GetBytes("DIC"));
loginToConnect = null;
WriteInLog("Disconnected. Chat terminated");
}
}
/// <summary>
/// Metoda odpowiedzialna za obsluge przychodzacych wiadomosci
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void MsgService(object sender, MsgEvent e)
{
sb.Clear();
Decoder decoder = Encoding.UTF8.GetDecoder();
char[] chars = new char[decoder.GetCharCount(e.msg, 0, e.msg.Length)];
decoder.GetChars(e.msg, 0, e.msg.Length, chars, 0);
sb.Append(chars);
string message = sb.ToString();
sb.Clear();
if (String.Compare("ONLR", 0, message, 0, 4) == 0)
{
string onlinelist = message.Substring(4);
onlinelist = onlinelist.Replace(' ', '\n');
WriteInLog("Online:\n" + onlinelist);
return;
}
else if (String.Compare("ISOR", 0, message, 0, 4) == 0)
{
bool isOnline = false;
string msg = null;
if (String.Compare("True", 0, message, 4, 4) == 0)
{
isOnline = true;
}
if (!isOnline)
{
sb.Append("Connection attempt with: ").Append(loginToConnect).
Append(" failed, User is offline");
msg = sb.ToString();
WriteInLog(msg);
loginToConnect = null;
sb.Clear();
return;
}
else
{
sb.Append("Connection attempt with: ").Append(loginToConnect).
Append(" succeed");
msg = sb.ToString();
WriteInLog(msg);
sb.Append("Waiting for certificate from ").Append(loginToConnect);
msg = sb.ToString();
WriteInLog(msg);
sb.Clear();
byte[] msgOut = BindingModule.enc.GetBytes("GCR");
cm.Send(msgOut);
return;
}
}
else if (String.Compare("GCRA", 0, message, 0, 4) == 0)
{
byte[] data = e.msg;
byte[] certRawData = new byte[data.Length - 4];
Array.Copy(data, 4, certRawData, 0, certRawData.Length);
X509Certificate2 cert = CryptoModule.CreatePublicCertFromRawData(certRawData);
loginToConnect = CryptoModule.ImportKey(cert, false, false);
string msg;
sb.Clear();
sb.Append("Alice received certicate from ").Append(loginToConnect).
Append(". Starting chat now");
msg = sb.ToString();
WriteInLog(msg);
//Rozpoczecie dzialania chatu
isChatOpen = true;
EnableDisableControls(false);
this.MsgTextBox.Enabled = true;
this.SendBtn.Enabled = true;
this.DisconnectBtn.Enabled = true;
return;
}
else if (String.Compare("GCRB", 0, message, 0, 4) == 0)
{
byte[] data = e.msg;
byte[] certRawData = new byte[data.Length - 4];
Array.Copy(data, 4, certRawData, 0, certRawData.Length);
X509Certificate2 cert = CryptoModule.CreatePublicCertFromRawData(certRawData);
loginToConnect = CryptoModule.ImportKey(cert, false, false);
string msg;
sb.Clear();
sb.Append("Bob received certicate from ").Append(loginToConnect).
Append(".Connecting. Starting chat now");
msg = sb.ToString();
WriteInLog(msg);
//Rozpoczecie dzialania chatu
isChatOpen = true;
EnableDisableControls(false);
this.MsgTextBox.Enabled = true;
this.SendBtn.Enabled = true;
this.DisconnectBtn.Enabled = true;
return;
}
else if (String.Compare("DIC", 0, message, 0, 3) == 0)
{
//Disconnect
if (isChatOpen)
{
SendBtn.Enabled = false;
MsgTextBox.Enabled = false;
isChatOpen = false;
EnableDisableControls(true);
this.MsgTextBox.Enabled = false;
this.SendBtn.Enabled = false;
this.DisconnectBtn.Enabled = false;
CryptoModule.RemoveUserKey(loginToConnect);
loginToConnect = null;
WriteInLog("Disconnected. Chat terminated");
}
}
else if (String.Compare("MSG", 0, message, 0, 3) == 0)
{
WriteInLog("MSG recived");
byte[] encrypted = new byte[128];
byte[] signed = new byte[128];
Array.Copy(e.msg, 3, encrypted, 0, 128);
Array.Copy(e.msg, 131, signed, 0, 128);
byte[] decrypted = CryptoModule.DecryptMsg(encrypted);
if (CryptoModule.Verify(decrypted, signed, loginToConnect))
{
string msg = Encoding.UTF8.GetString(decrypted);
WriteInLogAsOtherUser(msg);
}
else
{
//Disconnect
SendBtn.Enabled = false;
MsgTextBox.Enabled = false;
isChatOpen = false;
EnableDisableControls(true);
this.MsgTextBox.Enabled = false;
this.SendBtn.Enabled = false;
this.DisconnectBtn.Enabled = false;
CryptoModule.RemoveUserKey(loginToConnect);
cm.Send(Encoding.UTF8.GetBytes("DIC"));
loginToConnect = null;
WriteInLog("Disconnected. Chat terminated");
}
}
}