code: def add_response_signature(self, response_data, sign_algorithm=OneLogin_Saml2_Constants.RSA_SHA1):
          
          return self.__build_signature(response_data, 'SAMLResponse', sign_algorithm)
docs: Builds the Signature of the SAML Response.
          :param response_data: The Response parameters
          :type response_data: dict
  
          :param sign_algorithm: Signature algorithm method
          :type sign_algorithm: string