private void buttonLogin_Click(object sender, EventArgs e) { UdpClient klienti = new UdpClient(); Socket newSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); IPEndPoint ep = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 12000); EndPoint tempRemote = (EndPoint)ep; klienti.Connect(ep); byte[] bytesend = Encoding.ASCII.GetBytes(textBoxUsername.Text + ' ' + textBoxPassword.Text); klienti.Send(bytesend, bytesend.Length); byte[] receivedData = klienti.Receive(ref ep); if (string.Equals(Encoding.ASCII.GetString(receivedData), "Wrong password/username")) { textBoxUsername.Text = ""; textBoxPassword.Text = ""; Console.WriteLine(Encoding.ASCII.GetString(receivedData)); grade.Text = Encoding.ASCII.GetString(receivedData); } Console.WriteLine(Encoding.ASCII.GetString(receivedData)); grade.Text = Encoding.ASCII.GetString(receivedData); X509Certificate2 cert = GetCertificateFromStore("CN=RootCA"); if (cert == null) { Console.WriteLine("Certificate 'CN=CERT_SIGN_TEST_CERT' not found."); Console.ReadLine(); } if (Validate()) { string email = textBoxUsername.Text.Trim(); string password = textBoxPassword.Text.Trim(); DES des = new DES(); string mesazhi = email + ":" + password + ":" + "blla"; Console.WriteLine(mesazhi); byte[] encrytedData = des.Enkripto(mesazhi); byte[] IV = des.getIV(); byte[] key = des.getKey(); byte[] encryptedKey = EncryptDataOaepSha1(cert, key); Console.WriteLine(encryptedKey.Length); Console.WriteLine(Convert.ToBase64String(encryptedKey)); Console.WriteLine(Convert.ToBase64String(key)); Console.WriteLine(Convert.ToBase64String(DecryptDataOaepSha1(cert, encryptedKey))); string delimiter = "."; string fullmessageEncrypted = Convert.ToBase64String(IV) + delimiter + delimiter + Convert.ToBase64String(encrytedData); Console.WriteLine("qa qova :" + fullmessageEncrypted.Length); Console.WriteLine("IV:" + Convert.ToBase64String(IV)); Console.WriteLine("Qelsi: " + Convert.ToBase64String(encryptedKey)); Console.WriteLine("Mesazhi: " + Convert.ToBase64String(encrytedData)); if (Encoding.UTF8.GetString(des.Dekripto(Convert.ToBase64String(receivedData))).Substring(0, 2) == "OK") { MessageBox.Show("Successful Login"); } else { MessageBox.Show("Login failed"); } } }