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;

        }
        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;

        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);
        }
    }

    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];

            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

	// fetch the content from response body.
	getContent, err := io.ReadAll(response.Body)
	c.Assert(err, nil)

	// Get etag of the response content.
	getMD5 := getMD5Hash(getContent)

	// Compare putContent and getContent.
	c.Assert(putMD5, getMD5)
}

// TestGetPartialObjectMisAligned - tests get object partially miss-aligned.
// create a large buffer of miss-aligned data and upload it.