assertThrows(SmbUnsupportedOperationException.class, () -> transport.createEncryptionContext(new byte[] { 1 }, null));
        }

        @Test
        @DisplayName("createEncryptionContext rejects pre-SMB3 dialect")
        void createEncryptionContext_rejects_oldDialect() throws Exception {
            setField(transport, "smb2", true);
            Smb2NegotiateResponse nego = new Smb2NegotiateResponse(cfg);

            negotiate(altPort, resp);
            port = altPort;
        }

        if (resp.dialectIndex > 10) {
            throw new SmbException("This client does not support the negotiated dialect.");
        }
        if ((server.capabilities & CAP_EXTENDED_SECURITY) != CAP_EXTENDED_SECURITY && server.encryptionKeyLength != 8
                && LM_COMPATIBILITY == 0) {

    /**
     * SMB command to disconnect from a tree share.
     */
    public static final byte SMB_COM_TREE_DISCONNECT = (byte) 0x71;

    /**
     * SMB command to negotiate protocol dialect.
     */
    public static final byte SMB_COM_NEGOTIATE = (byte) 0x72;

    /**
     * SMB command to setup a session with extended attributes.
     */

    @Override
    int writeBytesWireFormat(final byte[] dst, final int dstIndex) {
        byte[] dialects;
        try {
            dialects = DIALECTS.getBytes("ASCII");
        } catch (final UnsupportedEncodingException uee) {
            return 0;
        }
        System.arraycopy(dialects, 0, dst, dstIndex, dialects.length);
        return dialects.length;
    }

    @Override