client workflow can now work with session-ids

auth and hello are now session-based
now multiple clients can work at the same time so the last criteria is 
also fullfilled

chap-client.py

 # connects to the XMLRPC Server
 s = xmlrpc.client.ServerProxy('http://localhost:8000')
 # initalized the login process
-key = s.init()
+session, key = s.init()
+password_hash = hashlib.sha256( ( 'Test123' + key ).encode( 'utf-8' ) ).hexdigest();
+
 # does the actual authentication
-print( s.auth( hashlib.sha256( ( 'Test123' + key ).encode( 'utf-8' ) ).hexdigest() ) )
+print( s.auth( session, password_hash ) )
 # tests protected method
-print( s.hello() )
-
-# Print list of available methods
-print( s.system.listMethods() )
+print( s.hello( session ) )
+# logs out cause anything seems to be done already
+print( s.logout( session, password_hash ) )

chap-server.py

 
     # checks if send hash is same as internally generated to validate if the correct
     # password was used
-    def auth( self, password_hash ):
-        combined = CHAP.test_password + self.key
-        passhash = hashlib.sha256( combined.encode( 'utf-8' ) ).hexdigest()
-        self.authenticated = passhash == password_hash
-        return self.authenticated
+    def auth( self, session, password_hash ):
+        if session in self.keys:
+            combined = CHAP.test_password + self.keys[ session ]
+            passhash = hashlib.sha256( combined.encode( 'utf-8' ) ).hexdigest()
+            self.authenticated[ session ] = passhash == password_hash
+            return self.authenticated[ session ] == True
+        else:
+            return False
 
     # adds functionality for users to log them selfes off, but also need the
     # the password_hash to ensure, that nobody else logs you off
     def logout( self, session, password_hash ):
-        if session in self.authenticated:
-            if self.auth( password_hash ):
-                self.authenticated[ session ] = False
-        return self.authenticated.get( session )
+        if self.auth( session, password_hash ):
+            del self.authenticated[ session ]
+            del self.keys[ session ]
+        return self.authenticated.get( session ) != True
 
     # a little method that refuses to say hi, if you
     # are not authenticated
-    def hello( self ):
-        if ( self.authenticated ):
+    def hello( self, session ):
+        if ( self.authenticated.get( session ) == True ):
             return 'Hi, you are authenticated'
         else:
             return 'Sorry, please authenticate first'