/// <summary>
/// Receive Message
/// </summary>
void Receive(object obj)
{
Socket client = obj as Socket;
try
{
c : while (true)//luôn luôn nhận
{
data = new byte[1024];
client.Receive(data);
if (string.Equals(Encoding.UTF8.GetString(data), "guikeyserver", StringComparison.InvariantCultureIgnoreCase))
{
nhankeydadoi = new byte[140];
client.Receive(nhankeydadoi);
keypublic = Convert.ToBase64String(nhankeydadoi);
txtkeyclient.Text = keypublic;
diff.LayKhoaBiMat(nhankeydadoi);
khoabimat = diff.aes.Key;
keysecret = Convert.ToBase64String(khoabimat);
txbSecretkey.Text = keysecret;
nhankey = nhankeydadoi;
}
else if (string.Equals(Encoding.UTF8.GetString(data), "guikeytoserver", StringComparison.InvariantCultureIgnoreCase))
{
nhankeydadoi = new byte[140];
client.Receive(nhankeydadoi);
keypublic = Convert.ToBase64String(nhankeydadoi);
txtkeyclient.Text = keypublic;
TaoKey();
diff.LayKhoaBiMat(nhankeydadoi);
khoabimat = diff.aes.Key;
keysecret = Convert.ToBase64String(khoabimat);
txbSecretkey.Text = keysecret;
nhankey = nhankeydadoi;
guiLaiKeyChoClientVuaGui();
}
else
{
tinnhan = new byte[BitConverter.ToInt32(data, 0)];
client.Receive(tinnhan);
byte[] nhanvector = new byte[16];
client.Receive(nhanvector);
string message = diff.GiaiMaDiffie(nhankey, tinnhan, nhanvector);
dateTimeIV = md5.maHoaMd5(DateTime.Now.ToString());
string time = dateTimeIV.Substring(0, 16);
dateTimeIv = Encoding.UTF8.GetBytes(time);
string a = txbSecretkey.Text.Substring(0, 32);
byte[] key = Encoding.ASCII.GetBytes(a);
string s = aes.DecryptString(message, key, dateTimeIv);
foreach (char c in s)
{
if (c.ToString() == ";")
{
string[] tokens = s.Trim().Split(';');
compare1 = tokens[1];
compare2 = md5.maHoaMd5(tokens[0]);
if (compare1 != compare2)
{
AddMessage(tokens[0]);
MessageHeTHong("chuỗi này đã bị thay đổi vì 2 chuỗi mã hóa khác nhau:");
MessageHeTHong("Chuỗi mã hóa trước khi gửi :" + compare1);
MessageHeTHong("chuỗi mã hóa sau khi mã hóa tin nhận :" + compare2);
goto c;
}
}
}
AddMessage(s);
}
}
}
catch
{
clientList.Remove(client);
client.Close();
}
}
void Receive(object obj)
{
Socket client = obj as Socket;
try
{
while (true)//luôn luôn nhận
{
data = new byte[1024];
client.Receive(data);
if (string.Equals(Encoding.UTF8.GetString(data), "guikeyserver", StringComparison.InvariantCultureIgnoreCase))
{
nhankeydadoi = new byte[140];
client.Receive(nhankeydadoi);
keypublic = Convert.ToBase64String(nhankeydadoi);
txtkeyclient.Text = keypublic;
diff.LayKhoaBiMat(nhankeydadoi);
khoabimat = diff.aes.Key;
keysecret = Convert.ToBase64String(khoabimat);
txbSecretkey.Text = keysecret;
nhankey = nhankeydadoi;
}
else if (string.Equals(Encoding.UTF8.GetString(data), "guikeytoserver", StringComparison.InvariantCultureIgnoreCase))
{
nhankeydadoi = new byte[140];
client.Receive(nhankeydadoi);
keypublic = Convert.ToBase64String(nhankeydadoi);
txtkeyclient.Text = keypublic;
TaoKey();
diff.LayKhoaBiMat(nhankeydadoi);
khoabimat = diff.aes.Key;
keysecret = Convert.ToBase64String(khoabimat);
txbSecretkey.Text = keysecret;
nhankey = nhankeydadoi;
guiLaiKeyChoClientVuaGui();
}
else
{
tinnhan = new byte[BitConverter.ToInt32(data, 0)];
client.Receive(tinnhan);
byte[] nhanvector = new byte[16];
client.Receive(nhanvector);
string message = diff.GiaiMaDiffie(nhankey, tinnhan, nhanvector);
dateTimeIV = md5.maHoaMd5(DateTime.Now.ToString());
string time = dateTimeIV.Substring(0, 16);
dateTimeIv = Encoding.UTF8.GetBytes(time);
string a = txbSecretkey.Text.Substring(0, 32);
byte[] key = Encoding.ASCII.GetBytes(a);
string s = aes.DecryptString(message, key, dateTimeIv);
AddMessage(s);
}
}
}
catch
{
clientList.Remove(client);
client.Close();
}
}
