init is now session-based

added logout functionality

chap-server.py

 class CHAP:
     test_password = 'Test123'
     # initializes class-instance and instance variables
-    def __init__(self):
-        self.key = '';
-        self.authenticated = False;
+    def __init__( self ):
+        self.keys = {}
+        self.authenticated = {}
 
     # 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
+    def init( self ):
+        session = str( uuid.uuid4() )
+        key = str( uuid.uuid4() )
+        while session in self.keys:
+            session = str( uuid.uuid4() )
+
+        self.keys[ session ] = key
+        return [ session, key ]
 
     # checks if send hash is same as internally generated to validate if the correct
     # password was used
-    def auth(self, password_hash):
+    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
 
+    # 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 )
+
     # a little method that refuses to say hi, if you
     # are not authenticated
-    def hello(self):
+    def hello( self ):
         if ( self.authenticated ):
             return 'Hi, you are authenticated'
         else: