def checkHash(digestHash):
        """
        @param digestHash: The hashed username:realm:password to check against.

        @return: C{True} if the credentials represented by this object match
            the given hash, C{False} if they do not, or a L{Deferred} which
            will be called back with one of these values.
        """

        @param digestHash: The hashed username:realm:password to check against.

        @return: C{True} if the credentials represented by this object match
            the given hash, C{False} if they do not, or a L{Deferred} which
            will be called back with one of these values.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/cred/credentials.py