def add_user(self, username, password):
     
     # Generate an ssh keypair for the user
     ssh_private = RSA.gen_key(1024, 65337).as_pem(cipher=None)
     twisted_key = keys.RSA.importKey(ssh_private)
     ssh_public = keys.Key(twisted_key).public().toString("openssh")  
     
     #add the user to the db.  
     user = {"username": username,
             "password": password,
             "pub_key": ssh_public,
             "priv_key": ssh_private}
     return connection_manager.get_user_collection().insert(user)
 def update_password(self, username, password):
     connection_manager.get_user_collection().update({"username":username},
                                                       {"$set": {"password": password}}, 
                                                        multi=False)
 def remove_user(self, username):
     connection_manager.get_user_collection().remove({"username":username})
 def get_user(self, username, password):
     user = connection_manager.get_user_collection().find_one({"username":username,
                                                               "password":password})
     return user