public static void run(byte[] receivedData_init, byte[] BSKey, UdpClient Bob, IPEndPoint Alice)
{
//Console.WriteLine("Bob: listens on port 11010.");
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);
//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);
//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.");
}
}
}
}
// private PerformanceCounter theCPUCounter =
// new PerformanceCounter("Processor", "% Processor Time", Process.GetCurrentProcess().ProcessName);
// public NSServer(byte[] Key1,byte[] Key2){
// ASKey=Key1;
// BSKey=Key2;
// remoteEP = new IPEndPoint(IPAddress.Parse("127.0.0.1"), NSUtilities.server_port);
// udpServer = new UdpClient(NSUtilities.server_port);
// }
static void Main(string[] args)
{
byte[] ASKey;
byte[] BSKey;
IPEndPoint remoteEP;
UdpClient udpServer;
remoteEP = new IPEndPoint(IPAddress.Parse("127.0.0.1"), NSUtilities.server_port);
udpServer = new UdpClient(NSUtilities.server_port);
// string[] keys = args[0].Split(new string[]{" "}, StringSplitOptions.None);
// BSKey=NSUtilities.getBytes(args[1]);
// ASKey=NSUtilities.getBytes(args[0]);
// ASKey=NSUtilities.ASKey;
// BSKey=NSUtilities.BSKey;
ASKey = new byte[] { 0x7, 0x6, 0x5, 0x4, 0x3, 0x2, 0x1, 0x8, 0x8, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7,
0x7, 0x6, 0x5, 0x4, 0x3, 0x2, 0x1, 0x8, 0x8, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7 };
BSKey = new byte[] { 0x7, 0x6, 0x5, 0x4, 0x3, 0x2, 0x1, 0x8, 0x8, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7,
0x7, 0x6, 0x5, 0x4, 0x3, 0x2, 0x1, 0x8, 0x8, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7 };
string nonceA = null;
string nonceB = null;
//Console.WriteLine("Start Server at port 11000");
int i = 0;
Console.WriteLine(" RoleS start processor time: {0}",
Process.GetCurrentProcess().TotalProcessorTime);
while (true)
{
byte[] data = udpServer.Receive(ref remoteEP); // listen on port 11000
//Console.WriteLine("Server: receive key request from Alice. ");
string dataString = NSUtilities.getString(data);
string[] msgs = dataString.Split(new string[] { " " }, StringSplitOptions.None);
if (String.Compare(msgs[0], "msg3:") == 0 && int.Parse(msgs[1]) == NSUtilities.Alice_port &&
int.Parse(msgs[2]) == NSUtilities.Bob_port)
{
nonceA = msgs[3];
string payload_B = NSUtilities.getString(NSUtilities.Decrypt(NSUtilities.getBytes(msgs[4]), BSKey));
nonceB = payload_B.Split(new string[] { " " }, StringSplitOptions.None)[1];
// Aes aesAlg = Aes.Create();
byte[] keyAB = NSUtilities.getKey(32);
string kAB_s = NSUtilities.getString(keyAB);
byte[] kAB_A = NSUtilities.getBytes(kAB_s + " " + nonceB + " " + NSUtilities.Alice_port);
byte[] enc_kAB_A = NSUtilities.Encrypt(kAB_A, BSKey);
string enc_kAB_A_s = NSUtilities.getString(enc_kAB_A);
byte[] msg2s = NSUtilities.getBytes(nonceA + " " + NSUtilities.Bob_port + " " + kAB_s + " " + enc_kAB_A_s);
byte[] msg2 = NSUtilities.Encrypt(msg2s, ASKey);
byte[] msg2combine = NSUtilities.getBytes("msg4: " + NSUtilities.getString(msg2));
udpServer.Send(msg2combine, msg2combine.Length, remoteEP);
//Console.WriteLine("Server: send Alice Kab. ");
}
i++;
if (i == NSUtilities.loop)
{
Console.WriteLine(" RoleS end processor time: {0}",
Process.GetCurrentProcess().TotalProcessorTime);
Process.GetCurrentProcess().Kill();
}
}
}
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);
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);
// 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);
//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);
//Console.WriteLine("Alice: successfully finished key negotiation.");
}
}
}
}