public JsonWebKeySignBuilder SetAlg(HMAC hmac, string algName)
        {
            _jsonWebKey.Alg = algName;
            _jsonWebKey.Kty = KeyTypes.OCT;
            foreach (var kvp in hmac.ExportKey())
            {
                _jsonWebKey.Content.Add(kvp.Key, kvp.Value);
            }

            return(this);
        }