public static void run(byte[] receivedData_init, byte[] BSKey, UdpClient Bob, IPEndPoint Alice)
{
//Console.WriteLine("Bob: listens on port 11010.");
Bob.Connect(Alice);
Int64 nonceB0 = NSUtilities.getNonce();
Int64 nonceB = NSUtilities.getNonce();
string dataString_init = NSUtilities.getString(receivedData_init);
//Console.WriteLine("Bob: receive info from Alice.");
string[] splits_init = dataString_init.Split(new string[] { " " }, StringSplitOptions.None);
if (String.Compare(splits_init[0], "msg1:") != 0 || String.Compare(splits_init[1], NSUtilities.Alice_port + "") != 0)
{
//Console.WriteLine("Bob: does not recognize message.");
return;
}
byte[] msg0_payload = NSUtilities.getBytes(NSUtilities.Alice_port + " " + nonceB0);
byte[] msg0 = NSUtilities.getBytes("msg2: " + NSUtilities.getString(NSUtilities.Encrypt(msg0_payload, BSKey)));
// Bob.Send(msg0,msg0.Length, Alice);
NSUtilities.Send(Bob.Client, msg0);
//Console.WriteLine("Bob: send first nonceB to Alice.");
byte[] receivedData = Bob.Receive(ref Alice);
string dataString = NSUtilities.getString(receivedData);
//Console.WriteLine("Bob: receive Kab from Alice.");
string[] splits = dataString.Split(new string[] { " " }, StringSplitOptions.None);
if (String.Compare(splits[0], "msg5:") == 0)
{
byte[] cipher3 = NSUtilities.getBytes(dataString.Substring(6, dataString.Length - 6));
string msg3 = NSUtilities.getString(NSUtilities.Decrypt(cipher3, BSKey));
string[] msg3s = msg3.Split(new string[] { " " }, StringSplitOptions.None);
if (int.Parse(msg3s[2]) == NSUtilities.Alice_port && Int64.Parse(msg3s[1]) == nonceB0)
{
//Console.WriteLine("Bob: verified the first nonceB.");
KeyAB = NSUtilities.getBytes(msg3s[0]);
byte[] msg4combine = NSUtilities.getBytes("msg6: " + NSUtilities.getString(NSUtilities.Encrypt(BitConverter.GetBytes(nonceB), KeyAB)));
// Bob.Send(msg4combine,msg4combine.Length, Alice);
NSUtilities.Send(Bob.Client, msg4combine);
//Console.WriteLine("Bob: send second nonceB to Alice.");
byte[] receivedData2 = Bob.Receive(ref Alice);
string dataString2 = NSUtilities.getString(receivedData2);
string[] splits2 = dataString2.Split(new string[] { " " }, StringSplitOptions.None);
if (String.Compare(splits2[0], "msg7:") == 0)
{
byte[] cipher5 = NSUtilities.getBytes(dataString2.Substring(6, dataString2.Length - 6));
Int64 nonceBminus;
//parse nonceB-1
nonceBminus = BitConverter.ToInt64(NSUtilities.Decrypt(cipher5, KeyAB), 0);
if (nonceBminus + 1 != nonceB)
{
return;
}
//Console.WriteLine("Bob: verified nonceB-1.");
//Console.WriteLine("Bob: successfully finished key negotiation.");
}
}
}
}
public static void run()
{
//Console.WriteLine("Alice: Sends its identity to Bob");
Alice.Connect(Bob);
byte[] msg_init = NSUtilities.getBytes("msg1: " + NSUtilities.Alice_port);
// Alice.Send(msg_init,msg_init.Length);
NSUtilities.Send(Alice.Client, msg_init);
byte[] receivedData_init = Alice.Receive(ref Bob);
string dataString_init = NSUtilities.getString(receivedData_init);
//Console.WriteLine("Alice: receive first nonce from Bob.");
string[] splits_init = dataString_init.Split(new string[] { " " }, StringSplitOptions.None);
if (String.Compare(splits_init[0], "msg2:") != 0)
{
//Console.WriteLine("Alice: does not recognize message.");
return;
}
//Console.WriteLine("Alice: Send key request to server");
Alice.Connect(server);
Int64 nonceA = NSUtilities.getNonce();
Int64 nonceB;
byte[] msg = NSUtilities.getBytes("msg3: " + NSUtilities.Alice_port + " " + NSUtilities.Bob_port + " " + nonceA + " " + splits_init[1]);
// send to server
// Alice.Send(msg,msg.Length);
NSUtilities.Send(Alice.Client, msg);
// then receive data
byte[] receivedData = Alice.Receive(ref server);
string dataString = NSUtilities.getString(receivedData);
//Console.WriteLine("Alice: receive key info from Server.");
string[] splits = dataString.Split(new string[] { " " }, StringSplitOptions.None);
if (String.Compare(splits[0], "msg4:") == 0)
{
byte[] cipher2 = NSUtilities.getBytes(dataString.Substring(6, dataString.Length - 6));
string msg2 = NSUtilities.getString(NSUtilities.Decrypt(cipher2, ASKey));
string[] msg2s = msg2.Split(new string[] { " " }, StringSplitOptions.None);
if (Int64.Parse(msg2s[0]) == nonceA && int.Parse(msg2s[1]) == NSUtilities.Bob_port)
{
KeyAB = NSUtilities.getBytes(msg2s[2]);
byte[] msg3combine = NSUtilities.getBytes("msg5: " + msg2s[3]);
// IPEndPoint Bob = new IPEndPoint(IPAddress.Parse("127.0.0.1"), NSUtilities.Bob_port);
Alice.Connect(Bob);
// Alice.Send(msg3combine,msg3combine.Length);
NSUtilities.Send(Alice.Client, msg3combine);
//Console.WriteLine("Alice: send Kab to Bob.");
byte[] receivedData2 = Alice.Receive(ref Bob);
string dataString2 = NSUtilities.getString(receivedData2);
string[] splits2 = dataString2.Split(new string[] { " " }, StringSplitOptions.None);
if (String.Compare(splits2[0], "msg6:") == 0)
{
byte[] cipher4 = NSUtilities.getBytes(dataString2.Substring(6, dataString2.Length - 6));
// parse nounceB
nonceB = BitConverter.ToInt64(NSUtilities.Decrypt(cipher4, KeyAB), 0);
//Console.WriteLine("Alice: decrypted nonceB with Kab.");
nonceB--;
byte[] msg5combine = NSUtilities.getBytes("msg7: " + NSUtilities.getString(NSUtilities.Encrypt(BitConverter.GetBytes(nonceB), KeyAB)));
// Alice.Send(msg5combine,msg5combine.Length);
NSUtilities.Send(Alice.Client, msg5combine);
//Console.WriteLine("Alice: successfully finished key negotiation.");
}
}
}
}