Java client: set tag to empty (if not set) to be backward compatible

         */

        if (header.getMessageType() == MessageType.PUT) {

            if (commandBuilder.getBodyBuilder().getKeyValueBuilder().hasTag() == false) {

                // set tag to empty for backward compatibility with drive.

                // this can be removed when drive does not require the tag

                // to be set.

                commandBuilder.getBodyBuilder().getKeyValueBuilder()

                        .setTag(ByteString.EMPTY);

                // calculate value message digest

                // ByteString tag = Hmac.calcTag(kineticMessage, this.myKey);

                // ByteString tag =

                // MessageDigestUtil.calculateTag(Algorithm.SHA1,

                // kineticMessage.getValue());

                //

                // set tag

                // commandBuilder.getBodyBuilder().getKeyValueBuilder()

                // .setTag(tag);

                //

                // Algorithm algo = Algorithm.SHA1;

                // commandBuilder.getBodyBuilder().getKeyValueBuilder()

                // .setAlgorithm(algo);

                // .setAlgorithm(Algorithm.INVALID_ALGORITHM);

            }

        }

        /**