if cred.IsTemp() && cred.IsExpired() {
				return nil, errInvalidAccessKeyID
			}
			return []byte(cred.SecretKey), nil
		} // this means claims.AccessKey == rootAccessKey
		if !globalAPIConfig.permitRootAccess() {
			// if root access is disabled, fail this request.
			return nil, errAccessKeyDisabled
		}
		return []byte(globalActiveCred.SecretKey), nil
	}); err != nil {
		return claims, nil, false, errAuthentication