code: Key getSigningKey(JwtConsumerConfig config, JwtContext jwtContext, Map properties) throws KeyException {
  		Key signingKey = null;
  		if (config == null) {
  			if (tc.isDebugEnabled()) {
  				Tr.debug(tc, "JWT consumer config object is null");
  			}
  			return null;
  		}
  		signingKey = getSigningKeyBasedOnSignatureAlgorithm(config, jwtContext, properties);
  		if (signingKey == null) {
  			if (tc.isDebugEnabled()) {
  				Tr.debug(tc, "A signing key could not be found");
  			}
  		}
  		return signingKey;
  	}
docs: Get the appropriate signing key based on the signature algorithm specified in
  the config.