*
 * This class represents negotiate contexts used in SMB 3.1.1
 * for capability negotiation and security enhancements.
 *
 * @author mbechler
 */
public interface NegotiateContextRequest extends Encodable {

    /**
     * Gets the negotiate context type.
     *
     * @return the SMB2 negotiate context type
     */
    int getContextType();

 * This negotiate context is used in SMB 3.1.1 to establish
 * pre-authentication integrity protection against downgrade attacks.
 *
 * @author mbechler
 */
public class PreauthIntegrityNegotiateContext implements NegotiateContextRequest, NegotiateContextResponse {

    /**
     * Context type
     */
    public static final int NEGO_CTX_PREAUTH_TYPE = 0x1;

    /**
     * SHA-512
     */

    private final int[] dialects;
    private int capabilities;
    private final byte[] clientGuid = new byte[16];
    private final int securityMode;
    private final NegotiateContextRequest[] negotiateContexts;
    private byte[] preauthSalt;

    /**
     * Constructs an SMB2 negotiate request with the specified configuration and security mode.
     *

 *
 * This negotiate context is used in SMB 3.x to negotiate
 * encryption capabilities and cipher suites.
 *
 * @author mbechler
 */
public class EncryptionNegotiateContext implements NegotiateContextRequest, NegotiateContextResponse {

    /**
     * Context type
     */
    public static final int NEGO_CTX_ENC_TYPE = 0x2;

    /**
     * AES 128 CCM
     */

 *
 * This context is used during SMB2 negotiation to indicate RDMA transform
 * capabilities when SMB Direct is supported by the client and server.
 */
public class Smb2RdmaTransformCapabilitiesContext implements NegotiateContextRequest, NegotiateContextResponse {

    // Context type
    /** Context ID for RDMA transform capabilities */
    public static final int CONTEXT_ID = Smb2Constants.SMB2_RDMA_TRANSFORM_CAPABILITIES;

 *
 * This context is used during SMB2 negotiation to negotiate compression
 * algorithms for SMB3 data compression support.
 */
public class CompressionNegotiateContext implements NegotiateContextRequest, NegotiateContextResponse {

    private static final Logger log = LoggerFactory.getLogger(CompressionNegotiateContext.class);

    // Context type
    /** Context ID for compression capabilities */