*/
    public static MessageDigest getMD4 () {
        try {
            return MessageDigest.getInstance("MD4", getProvider());
        }
        catch ( NoSuchAlgorithmException e ) {
            throw new CIFSUnsupportedCryptoException(e);
        }
    }


    /**
     * 
     * @return MD5 digest
     */
    public static MessageDigest getMD5 () {
        try {

     * 
     * @param domain
     * @param tf
     * @return connection
     * @throws CIFSException
     * @throws jcifs.smb.SmbAuthException
     */
    SmbTransport getDc ( CIFSContext tf, String domain ) throws CIFSException;


    /**
     * Resolve the location of a DFS path
     * 
     * @param domain
     * @param root
     * @param path
     * @param tf

            return null;
        }

    }


    /**
     * 
     * {@inheritDoc}
     *
     * @see jcifs.DfsResolver#getDc(jcifs.CIFSContext, java.lang.String)
     */
    @Override
    public SmbTransport getDc ( CIFSContext tf, String domain ) throws SmbAuthException {
        if ( tf.getConfig().isDfsDisabled() )
            return null;

     */
    public static byte[] getNTHash ( String password ) {
        if ( password == null ) {
            throw new NullPointerException("Password parameter is required");
        }
        MessageDigest md4 = Crypto.getMD4();
        md4.update(Strings.getUNIBytes(password));
        return md4.digest();
    }


    /**
     * 
     * @param password
     * @return the calculated hash
     */

    private SID id;
    private int attributes;


    public PacGroup ( SID id, int attributes ) {
        super();
        this.id = id;
        this.attributes = attributes;
    }


    public SID getId () {
        return this.id;
    }


    public int getAttributes () {
        return this.attributes;
    }

    @Test
    public void resolveDC () throws CIFSException {
        CIFSContext context = withAnonymousCredentials();
        DfsResolver dfs = context.getDfs();

        try ( SmbTransport dc = dfs.getDc(context, getTestDomain()) ) {
            Address addr = dc.getRemoteAddress();
            String remoteHostName = dc.getRemoteHostName();
            assertNotNull(addr);
            assertNotNull(remoteHostName);

            log.debug("Server seal key is " + Hexdump.toHexString(this.sealServerKey));
        }
    }


    private static byte[] deriveKey ( byte[] masterKey, String cnst ) {
        MessageDigest md5 = Crypto.getMD5();
        md5.update(masterKey);
        md5.update(cnst.getBytes(StandardCharsets.US_ASCII));
        md5.update((byte) 0);
        return md5.digest();
    }


    @Override

        }
        for ( int i = length; i < BLOCK_LENGTH; i++ ) {
            this.ipad[ i ] = IPAD;
            this.opad[ i ] = OPAD;
        }

        this.md5 = Crypto.getMD5();
        engineReset();
    }


    private HMACT64 ( HMACT64 hmac ) throws CloneNotSupportedException {
        super("HMACT64");
        this.ipad = hmac.ipad;
        this.opad = hmac.opad;

     * @throws SmbException
     */
    public void getUserSessionKey ( CIFSContext tc, byte[] chlng, byte[] dest, int offset ) throws SmbException {
        try {
            MessageDigest md4 = Crypto.getMD4();
            byte[] ntHash = getNTHash();
            switch ( tc.getConfig().getLanManCompatibility() ) {
            case 0:
            case 1:
            case 2:
                md4.update(ntHash);

        this.digest = Crypto.getMD5();
        this.macSigningKey = macSigningKey;
    }


    /**
     * Construct a digest with a non-zero starting sequence number
     * 
     * @param macSigningKey
     * @param initialSequence
     */
    public SMB1SigningDigest ( byte[] macSigningKey, int initialSequence ) {
        this.digest = Crypto.getMD5();
        this.macSigningKey = macSigningKey;