Several fixes to authenticator, added more unit tests

Some fixes include, in more detail:
- Using little over big endianess in some parts
- Flagging all the constructor numbers as unsigned
- Fixed bugs with factorizer
- Implemented TLSharp's RSA

network/tcp_client.py

@@ -10,10 +10,12 @@ class TcpClient:
     def connect(self, ip, port):
         """Connects to the specified IP and port number"""
         self.socket.connect((ip, port))
+        self.connected = True
 
     def close(self):
         """Closes the connection"""
         self.socket.close()
+        self.connected = False
 
     def write(self, data):
         """Writes (sends) the specified bytes to the connected peer"""