code: def get_signing_key(self, algorithm, service_context):
          
          return service_context.keyjar.get_signing_key(
              alg2keytype(algorithm), alg=algorithm)
docs: Pick signing key based on signing algorithm to be used
  
          :param algorithm: Signing algorithm
          :param service_context: A
              :py:class:`oidcservice.service_context.ServiceContext` instance
          :return: A key