def make_internal_signing_service(config, entity_id):
_args = dict([(k, v) for k, v in config.items() if k in KJ_SPECS])<EOL>_kj = init_key_jar(**_args)<EOL>return InternalSigningService(entity_id, _kj)<EOL>
Given configuration initiate an InternalSigningService instance

:param config: The signing service configuration
:param entity_id: The entity identifier
:return: A InternalSigningService instance