catch ( NoSuchAlgorithmException e ) {
            throw new CIFSUnsupportedCryptoException(e);
        }
    }


    /**
     * 
     * @return MD5 digest
     */
    public static MessageDigest getMD5 () {
        try {
            return MessageDigest.getInstance("MD5");
        }
        catch ( NoSuchAlgorithmException e ) {
            throw new CIFSUnsupportedCryptoException(e);
        }
    }

        }
        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;

    public static byte[] getNTLM2Response ( byte[] passwordHash, byte[] serverChallenge, byte[] clientChallenge ) throws GeneralSecurityException {
        byte[] sessionHash = new byte[8];

        MessageDigest md5 = Crypto.getMD5();;
        md5.update(serverChallenge);
        md5.update(clientChallenge, 0, 8);
        System.arraycopy(md5.digest(), 0, sessionHash, 0, 8);

        byte[] key = new byte[21];