// (c) 2006 Richard Grimes
// www.grimes.demon.co.uk

using System;
using System.Security.Cryptography;
using System.Net.Sockets;
using System.Net;
using System.Text;

class Bob
{
   static void Main()
   {
      TcpClient client = new TcpClient();
      client.Connect(IPAddress.Loopback, 5000);
      NetworkStream stm = client.GetStream();
      if (args.Length > 0)
      {
         byte[] quit = Encoding.ASCII.GetBytes(args[0]);
         stm.Write(quit, 0, quit.Length);
         client.Close();
         return;
      }
      byte[] buf = Encoding.ASCII.GetBytes("KEY");
      stm.Write(buf, 0, buf.Length);
      byte[] readBuf = new byte[client.ReceiveBufferSize];
      int read = stm.Read(readBuf, 0, readBuf.Length);
      string reply = Encoding.ASCII.GetString(readBuf, 0, read);
      if (reply.ToLower() == "ack")
      {
         RandomNumberGenerator rand = RandomNumberGenerator.Create();
         byte[] key = new byte[128];
         rand.GetBytes(key);
         Console.WriteLine(BitConverter.ToString(key));
         stm.Write(key, 0, key.Length);
      }
      client.Close();
   }
}