}
        if (len == 0) {
            resp = initialToken();
        } else {
            resp = negotitate(inputBuf, offset, len);
        }

        if (resp == null) {
            return null;
        }
        return resp.toByteArray();
    }

    private SpnegoToken negotitate(final byte[] inputBuf, final int offset, final int len) throws CIFSException {

     */
    @Override
    public byte[] getServerEncryptionKey() {
        if (this.negotiated == null) {
            return null;
        }

        if (this.negotiated instanceof SmbComNegotiateResponse) {
            return ((SmbComNegotiateResponse) this.negotiated).getServerData().encryptionKey;
        }
        return null;
    }

    @Override

    }

    /**
     * Returns the server capabilities negotiated during the SMB handshake.
     *
     * @return the negotiated capabilities
     */
    public int getNegotiatedCapabilities() {
        return this.capabilities;
    }

    /**
     * Gets the negotiated send buffer size.
     *
     * @return negotiated send buffer size
     */
    public int getNegotiatedSendBufferSize() {

import jcifs.Decodable;
import jcifs.internal.SMBProtocolDecodingException;
import jcifs.internal.util.SMBUtil;

/**
 * SMB2 Validate Negotiate Info response data structure. This structure contains the server's
 * validation of the originally negotiated SMB2 dialect.
 *
 * @author mbechler
 *
 */
public class ValidateNegotiateInfoResponse implements Decodable {

    /**

        }
    }

    @Override
    protected void doConnect() throws IOException {
        /*
         * Negotiate Protocol Request / Response
         */

        final SmbComNegotiateResponse resp = new SmbComNegotiateResponse(server);
        try {
            negotiate(port, resp);
        } catch (final ConnectException | NoRouteToHostException nr) {

    }

    /**
     * Get the negotiated SMB Direct protocol version
     *
     * @return negotiated protocol version
     */
    public int getNegotiatedVersion() {
        return negotiatedVersion;
    }

    /**
     * Set the negotiated SMB Direct protocol version
     *
     * @param negotiatedVersion negotiated protocol version
     */

                log.debug("Multiple preauth negotiate contexts");
                return false;
            }
        }

        if (!foundPreauth) {
            log.error("Missing preauth negotiate context");
            return false;
        }
        if (!foundEnc && (caps & Smb2Constants.SMB2_GLOBAL_CAP_ENCRYPTION) != 0) {
            log.error("Missing encryption negotiate context");
            return false;

 * to a remote host. Newer TLS options are quite useful:
 *
 *  * Server Name Indication (SNI) enables one IP address to negotiate secure connections for
 *    multiple domain names.
 *
 *  * Application Layer Protocol Negotiation (ALPN) enables the HTTPS port (443) to be used to
 *    negotiate HTTP/2.
 *
 * Unfortunately, older HTTPS servers refuse to connect when such options are presented. Rather than

 */
package jcifs.internal.smb2.ioctl;

import jcifs.Encodable;
import jcifs.internal.util.SMBUtil;

/**
 * SMB2 Validate Negotiate Info request data structure. This structure is used to validate
 * that the negotiated SMB2 dialect matches what was originally negotiated.
 *
 * @author mbechler
 *
 */
public class ValidateNegotiateInfoRequest implements Encodable {

    private final int capabilities;

        }
    }

    @Override
    public void destroy() {
    }

    /**
     * This method simply calls {@code negotiate( req, resp, false )}
     * and then {@code chain.doFilter}. You can override and call
     * negotiate manually to achive a variety of different behavior.
     */
    @Override