code: def _verify_dict(self, conf):
          
          if not conf:
              raise SATOSAConfigurationError("Missing configuration or unknown format")
  
          for key in SATOSAConfig.mandatory_dict_keys:
              if key not in conf:
                  raise SATOSAConfigurationError("Missing key '%s' in config" % key)
  
          for key in SATOSAConfig.sensitive_dict_keys:
              if key not in conf and "SATOSA_{key}".format(key=key) not in os.environ:
                  raise SATOSAConfigurationError("Missing key '%s' from config and ENVIRONMENT" % key)
docs: Check that the configuration contains all necessary keys.
  
          :type conf: dict
          :rtype: None
          :raise SATOSAConfigurationError: if the configuration is incorrect
  
          :param conf: config to verify
          :return: None