implemented auth method and client workflow

base-functionality is done

chap-client.py

@@ -1,11 +1,14 @@
 #!/usr/bin/env python2
 
 import xmlrpc.client
+import hashlib
 
+# connects to the XMLRPC Server
 s = xmlrpc.client.ServerProxy('http://localhost:8000')
-print( s.pow(2,3) )  # Returns 2**3 = 8
-print( s.add(2,3) )  # Returns 5
-print( s.div(5,2) )  # Returns 5//2 = 2
+# initalized the login process
+key = s.init()
+# does the actual authentication
+print( s.auth( hashlib.sha256( ( 'Test123' + key ).encode( 'utf-8' ) ).hexdigest() ) )
 
 # Print list of available methods
 print( s.system.listMethods() )

chap-server.py

@@ -1,6 +1,7 @@
 #!/usr/bin/env python2
 
 import uuid
+import hashlib
 from xmlrpc.server import SimpleXMLRPCServer
 from xmlrpc.server import SimpleXMLRPCRequestHandler
 
@@ -17,13 +18,28 @@ server.register_introspection_functions()
 # Register an instance; all the methods of the instance are
 # published as XML-RPC methods
 class CHAP:
+    test_password = 'Test123'
+    # initializes class-instance and instance variables
     def __init__(self):
-        self.key = 0;
+        self.key = '';
+        self.authenticated = 0;
 
+    # tells the server to start the autentification process
+    # and send the generated random salt
     def init(self):
         self.key = str( uuid.uuid4() )
         return self.key
 
+    # 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()
+        print( passhash )
+        print( password_hash )
+        self.authenticated = passhash == password_hash
+        return self.authenticated
+
 server.register_instance(CHAP())
 # Run the server's main loop
 server.serve_forever()