private static Provider provider = null;


    /**
     * 
     */
    private Crypto () {}


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

     * @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);

     */
    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
     */

                System.arraycopy(type2.getChallenge(), 0, sessionNonce, 0, 8);
                System.arraycopy(clientChallenge, 0, sessionNonce, 8, 8);

                MessageDigest md4 = Crypto.getMD4();
                md4.update(passwordHash);
                byte[] userSessionKey = md4.digest();

                MessageDigest hmac = Crypto.getHMACT64(userSessionKey);
                hmac.update(sessionNonce);