break;
        case SMB2_LOCK:
            c = "SMB2_LOCK";
            break;
        case SMB2_IOCTL:
            c = "SMB2_IOCTL";
            break;
        case SMB2_CANCEL:
            c = "SMB2_CANCEL";
            break;
        case SMB2_ECHO:
            c = "SMB2_ECHO";
            break;
        case SMB2_QUERY_DIRECTORY:
            c = "SMB2_QUERY_DIRECTORY";
            break;

    /**
     * 
     */
    public static final byte SMB_COM_NT_TRANSACT = (byte) 0xA0;

    /**
     * 
     */
    public static final byte SMB_COM_NT_CANCEL = (byte) 0xA4;

    /**
     * 
     */
    public static final byte SMB_COM_NT_TRANSACT_SECONDARY = (byte) 0xA1;

    /**
     * 
     */

        }
    }


    /**
     * This constructor used to instance a SigningDigest object for
     * signing/verifying SMB using kerberos session key.
     * The MAC Key = concat(Session Key, Digest of Challenge);
     * Because of Kerberos Authentication don't have challenge,
     * The MAC Key = Session Key
     * 
     * @param macSigningKey
     *            The MAC key used to sign or verify SMB.