md4.update(responseKeyNT);
                    final byte[] userSessionKey = md4.digest();

                    final HMACT64 hmac = new HMACT64(userSessionKey);
                    hmac.update(sessionNonce);
                    final byte[] ntlm2SessionKey = hmac.digest();

                    if ((getFlags() & NTLMSSP_NEGOTIATE_KEY_EXCH) != 0) {
                        masterKey = new byte[16];

    }

    private AuthScheme getAuthScheme() {
        final String scheme = getProtocolScheme();
        if (Constants.BASIC.equals(scheme)) {
            return new BasicScheme();
        }
        if (Constants.DIGEST.equals(scheme)) {
            return new DigestScheme();
        }
        if (Constants.NTLM.equals(scheme)) {
            final Properties props = new Properties();

            }
        }
        // digest
        final String digest = getSingleNodeValue(document, getDigestXpath(fessConfig, xpathConfigMap), node -> node);
        if (StringUtil.isNotBlank(digest)) {
            putResultDataBody(dataMap, fessConfig.getIndexFieldDigest(), digest);
        } else {
            putResultDataBody(dataMap, fessConfig.getIndexFieldDigest(),

                md4.update(passwordHash);
                final byte[] userSessionKey = md4.digest();

                final MessageDigest hmac = Crypto.getHMACT64(userSessionKey);
                hmac.update(sessionNonce);
                final byte[] ntlm2SessionKey = hmac.digest();

                if (getFlag(NTLMSSP_NEGOTIATE_KEY_EXCH)) {
                    this.masterKey = new byte[16];

        dstIndex += writeHeaderWireFormat(dst, dstIndex);
        dstIndex += writeAndXWireFormat(dst, dstIndex);
        length = dstIndex - start;

        if (digest != null) {
            digest.sign(dst, headerStart, length, this, response);
        }

        return length;
    }

    /*
     * We overload this because we want readAndXWireFormat to

        dstIndex += writeHeaderWireFormat(dst, dstIndex);
        dstIndex += writeAndXWireFormat(dst, dstIndex);
        this.length = dstIndex - start;

        if (this.digest != null) {
            this.digest.sign(dst, this.headerStart, this.length, this, this.getResponse());
        }

        return this.length;
    }

    /*
     * We overload this because we want readAndXWireFormat to

      },
      "timestamp": {
        "type": "date",
        "format": "date_optional_time"
      },
      "expires": {
        "type": "date",
        "format": "date_optional_time"
      },
      "digest": {
        "type": "text",
        "index": false
      },
      "doc_id": {
        "type": "keyword"
      },
      "favorite_count": {
        "type": "long"
      },
      "filename": {

        this.fid = fid;
        this.offset = offset;
        this.remaining = remaining;
        this.b = b;
        this.off = off;
        this.dataLength = len;
        this.digest = null; /*
                             * otherwise recycled commands
                             * like writeandx will choke if session
                             * closes in between
                             */
    }

        // mimetype
        defaultDataMap.put(fessConfig.getIndexFieldMimetype(), mimeType);
        // title
        // content
        // cache
        // digest
        // host
        // site
        // url
        // anchor
        // content_length
        // last_modified
        // id
        // virtual_host

    // ============================================================

    /** Basic authentication type identifier. */
    public static final String BASIC = "BASIC";

    /** Digest authentication type identifier. */
    public static final String DIGEST = "DIGEST";

    /** NTLM authentication type identifier. */
    public static final String NTLM = "NTLM";

    /** Form-based authentication type identifier. */