/// <summary>
/// Receive Message
/// </summary>
void Receive()
{
try
{
c : while (true)//luôn luôn nhận
{
data = new byte[1024];
client.Receive(data);
if (string.Equals(Encoding.UTF8.GetString(data), "guikey", StringComparison.InvariantCultureIgnoreCase))
{
txtkeyserver.Clear();
txtFinalKey.Clear();
nhankeydadoi = new byte[140];
client.Receive(nhankeydadoi);
keypublic = Convert.ToBase64String(nhankeydadoi);
txtkeyserver.Text = keypublic;
TaoKey();
Diff.LayKhoaBiMat(nhankeydadoi);
khoabimat = Diff.aes.Key;
keysecret = Convert.ToBase64String(khoabimat);
txtFinalKey.Text = keysecret;
nhankey = nhankeydadoi;
guilaipublickey();
}
else if (string.Equals(Encoding.UTF8.GetString(data), "guikeytoclient", StringComparison.InvariantCultureIgnoreCase))
{
txtkeyserver.Clear();
txtFinalKey.Clear();
nhankeydadoi = new byte[140];
client.Receive(nhankeydadoi);
keypublic = Convert.ToBase64String(nhankeydadoi);
txtkeyserver.Text = keypublic;
Diff.LayKhoaBiMat(nhankeydadoi);
khoabimat = Diff.aes.Key;
keysecret = Convert.ToBase64String(khoabimat);
txtFinalKey.Text = keysecret;
nhankey = nhankeydadoi;
}
else
{
dateTimeIV = md5.maHoaMd5(DateTime.Now.ToString());
string time = dateTimeIV.Substring(0, 16);
dateTimeIv = Encoding.UTF8.GetBytes(time);
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);
string a = txtFinalKey.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 (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
void Receive()
{
try
{
c : while (true)
{
byte[] data = new byte[1024];
client.Receive(data);
if (string.Equals(Encoding.UTF8.GetString(data), "guikey", StringComparison.InvariantCultureIgnoreCase))
{
txtServerKey.Clear();
txtFinalKey.Clear();
nhankeydadoi = new byte[140];
client.Receive(nhankeydadoi);
keypublic = Convert.ToBase64String(nhankeydadoi);
txtServerKey.Text = keypublic;
CreatePublicKey();
Diff.LayKhoaBiMat(nhankeydadoi);
khoabimat = Diff.aes.Key;
keysecret = Convert.ToBase64String(khoabimat);
txtFinalKey.Text = keysecret;
nhankey = nhankeydadoi;
guilaipublickey();
}
else if (string.Equals(Encoding.UTF8.GetString(data), "guikeytoclient", StringComparison.InvariantCultureIgnoreCase))
{
txtServerKey.Clear();
txtFinalKey.Clear();
nhankeydadoi = new byte[140];
client.Receive(nhankeydadoi);
keypublic = Convert.ToBase64String(nhankeydadoi);
txtServerKey.Text = keypublic;
Diff.LayKhoaBiMat(nhankeydadoi);
khoabimat = Diff.aes.Key;
keysecret = Convert.ToBase64String(khoabimat);
txtFinalKey.Text = keysecret;
nhankey = nhankeydadoi;
}
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 = txtFinalKey.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)
{
LstMS.Items.Add("Server: " + tokens[0]);
LstMS.Items.Add("Dữ liệu đã bị thay đổi trong quá trình chuyền:");
LstMS.Items.Add("Chuỗi mã trước:" + compare1);
LstMS.Items.Add("Chuỗi mã sau:" + compare2);
goto c;
}
}
}
LstMS.Items.Add("Server: " + s);
}
}
}catch
{
Close();
}
}
void Receive()
{
try
{
c : while (true)
{
data = new byte[1024];
client.Receive(data);
if (string.Equals(Encoding.UTF8.GetString(data), "guikey", StringComparison.InvariantCultureIgnoreCase))
{
textBox2.Clear();
textBox4.Clear();
nhankeydadoi = new byte[140];
client.Receive(nhankeydadoi);
keypublic = Convert.ToBase64String(nhankeydadoi);
textBox2.Text = keypublic;
TaoKey();
Diff.LayKhoaBiMat(nhankeydadoi);
khoabimat = Diff.aes.Key;
keysecret = Convert.ToBase64String(khoabimat);
textBox4.Text = keysecret;
nhankey = nhankeydadoi;
guilaipublickey();
}
else if (string.Equals(Encoding.UTF8.GetString(data), "guikeytoclient", StringComparison.InvariantCultureIgnoreCase))
{
textBox2.Clear();
textBox4.Clear();
nhankeydadoi = new byte[140];
client.Receive(nhankeydadoi);
keypublic = Convert.ToBase64String(nhankeydadoi);
textBox2.Text = keypublic;
Diff.LayKhoaBiMat(nhankeydadoi);
khoabimat = Diff.aes.Key;
keysecret = Convert.ToBase64String(khoabimat);
textBox4.Text = keysecret;
nhankey = nhankeydadoi;
}
else
{
dateTimeIV = md5.maHoaMd5(DateTime.Now.ToString());
string time = dateTimeIV.Substring(0, 16);
dateTimeIv = Encoding.UTF8.GetBytes(time);
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);
string a = textBox4.Text.Substring(0, 32);
byte[] key = Encoding.ASCII.GetBytes(a);
string s = aes.DecryptString(message, key, dateTimeIv);
string[] arr = s.Split('|');
string padding = arr[1];
string result = s.Substring(0, s.Length - int.Parse(padding));
AddMessage(result);
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}