// 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 key, err
	}
	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,

		if crypto.SSECopy.IsRequested(header) {
			clientKey, err = crypto.SSECopy.ParseHTTP(header)
			if err != nil {
				return opts, err
			}
			if sse, err = encrypt.NewSSEC(clientKey[:]); err != nil {
				return opts, err
			}
			opts.ServerSideEncryption = encrypt.SSECopy(sse)
			return opts, err
		}
		return opts, err
	}

	if crypto.SSEC.IsRequested(header) {
		clientKey, err = crypto.SSEC.ParseHTTP(header)

		},
		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()

		},
		Extensions: make(map[string]string),
	}, nil
}

func validateClientKeyIsTrusted(c ssh.ConnMetadata, clientKey ssh.PublicKey) (err error) {
	if globalSFTPTrustedCAPubkey == nil {
		return errors.New("public key authority validation requested but no ca public key specified.")
	}

	cert, ok := clientKey.(*ssh.Certificate)
	if !ok {
		return errSftpPublicKeyWithoutCert
	}

			Enable:     enabled,
			Endpoint:   *url,
			Transport:  transport,
			AuthToken:  env.Get(authEnv, kv.Get(target.WebhookAuthToken)),
			ClientCert: env.Get(clientCertEnv, kv.Get(target.WebhookClientCert)),
			ClientKey:  env.Get(clientKeyEnv, kv.Get(target.WebhookClientKey)),
		}
		if err = webhookArgs.Validate(); err != nil {
			return nil, err
		}
		webhookTargets[k] = webhookArgs
	}
	return webhookTargets, nil

	UserAgent   string            `json:"userAgent"`
	Endpoint    *xnet.URL         `json:"endpoint"`
	AuthToken   string            `json:"authToken"`
	ClientCert  string            `json:"clientCert"`
	ClientKey   string            `json:"clientKey"`
	BatchSize   int               `json:"batchSize"`
	QueueSize   int               `json:"queueSize"`
	QueueDir    string            `json:"queueDir"`
	MaxRetry    int               `json:"maxRetry"`