return key, ErrMissingCustomerKeyMD5
	}

	clientKey, err := base64.StdEncoding.DecodeString(h.Get(xhttp.AmzServerSideEncryptionCopyCustomerKey))
	if err != nil || len(clientKey) != 32 { // The client key must be 256 bits long
		return key, ErrInvalidCustomerKey
	}
	keyMD5, err := base64.StdEncoding.DecodeString(h.Get(xhttp.AmzServerSideEncryptionCopyCustomerKeyMD5))
	if md5Sum := md5.Sum(clientKey); err != nil || !bytes.Equal(md5Sum[:], keyMD5) {

	Transport  *http.Transport `json:"-"`
	QueueDir   string          `json:"queueDir"`
	QueueLimit uint64          `json:"queueLimit"`
	ClientCert string          `json:"clientCert"`
	ClientKey  string          `json:"clientKey"`
}

// Validate WebhookArgs fields
func (w WebhookArgs) Validate() error {
	if !w.Enable {
		return nil
	}
	if w.Endpoint.IsEmpty() {
		return errors.New("endpoint empty")
	}

		return key, ErrMissingCustomerKeyMD5
	}

	clientKey, err := base64.StdEncoding.DecodeString(h.Get(xhttp.AmzServerSideEncryptionCustomerKey))
	if err != nil || len(clientKey) != 32 { // The client key must be 256 bits long
		return key, ErrInvalidCustomerKey
	}
	keyMD5, err := base64.StdEncoding.DecodeString(h.Get(xhttp.AmzServerSideEncryptionCustomerKeyMD5))
	if md5Sum := md5.Sum(clientKey); err != nil || !bytes.Equal(md5Sum[:], keyMD5) {

	ClientCert string          `json:"clientCert"`
	ClientKey  string          `json:"clientKey"`
}

// Validate WebhookArgs fields
func (w WebhookArgs) Validate() error {
	if !w.Enable {
		return nil
	}
	if w.Endpoint.IsEmpty() {
		return errors.New("endpoint empty")
	}
	if w.ClientCert != "" && w.ClientKey == "" || w.ClientCert == "" && w.ClientKey != "" {
		return errors.New("cert and key must be specified as a pair")

// initialization vector (IV) and the bucket/object path.
//
//  1. Encrypt:
//     Input: ClientKey, bucket, object, metadata, object_data
//     -              IV := Random({0,1}²⁵⁶)
//     -       ObjectKey := SHA256(ClientKey || Random({0,1}²⁵⁶))
//     -       KeyEncKey := HMAC-SHA256(ClientKey, IV || 'SSE-C' || 'DAREv2-HMAC-SHA256' || bucket || '/' || object)
//     -       SealedKey := DAREv2_Enc(KeyEncKey, ObjectKey)

	}
	return cert, nil
}

// EnsureCertAndKey checks if both client certificate and key paths are provided
func EnsureCertAndKey(clientCert, clientKey string) error {
	if (clientCert != "" && clientKey == "") ||
		(clientCert == "" && clientKey != "") {
		return errors.New("cert and key must be specified as a pair")
	}
	return nil

	clientKey, err := sse.ParseHTTP(h)
	if err != nil {
		return
	}
	return unsealObjectKey(clientKey[:], metadata, bucket, object)
}

// unsealObjectKey decrypts and returns the sealed object key
// from the metadata using the SSE-C client key.
func unsealObjectKey(clientKey []byte, metadata map[string]string, bucket, object string) (key ObjectKey, err error) {

// communicating with client cert authentication.
func (s ConnSettings) NewHTTPTransportWithClientCerts(ctx context.Context, clientCert, clientKey string) (*http.Transport, error) {
	transport := s.NewHTTPTransportWithTimeout(1 * time.Minute)
	if clientCert != "" && clientKey != "" {
		c, err := certs.NewManager(ctx, clientCert, clientKey, tls.LoadX509KeyPair)
		if err != nil {
			return nil, err
		}
		if c != nil {

			Key:         ClientCert,
			Description: "mTLS certificate for webhook authentication",
			Optional:    true,
			Type:        "string",
			Sensitive:   true,
		},
		config.HelpKV{
			Key:         ClientKey,
			Description: "mTLS certificate key for webhook authentication",
			Optional:    true,
			Type:        "string",
			Sensitive:   true,
		},
		config.HelpKV{
			Key:         BatchSize,

		},
		Subject:       "test",
		Secure:        true,
		CertAuthority: path.Join("testdata", "contrib", "certs", "root_ca_cert.pem"),
		ClientCert:    path.Join("testdata", "contrib", "certs", "nats_client_cert.pem"),
		ClientKey:     path.Join("testdata", "contrib", "certs", "nats_client_key.pem"),
	}

	con, err := clientConfig.connectNats()
	if err != nil {
		t.Errorf("Could not connect to nats: %v", err)
	}
	defer con.Close()