byte[] ipad = new byte[64];
        byte[] opad = new byte[64];

        for (int i = 0; i < key.length; i++) {
            ipad[i] = (byte) (key[i] ^ 0x36);
            opad[i] = (byte) (key[i] ^ 0x5c);
        }
        for (int i = key.length; i < 64; i++) {
            ipad[i] = 0x36;
            opad[i] = 0x5c;
        }

        md5.update(ipad);

        MessageDigest md5 = MessageDigest.getInstance("MD5");
        byte[] ipad = new byte[64];
        byte[] opad = new byte[64];

        // HMACT64 specific: truncate key to 64 bytes if needed
        int keyLen = Math.min(key.length, 64);
        for (int i = 0; i < keyLen; i++) {
            ipad[i] = (byte) (key[i] ^ 0x36);
            opad[i] = (byte) (key[i] ^ 0x5c);
        }
        for (int i = keyLen; i < 64; i++) {

    @Test
    @DisplayName("Test pad calculation with various offsets")
    void testPadCalculation() {
        // Test pad calculation with different alignment values
        assertEquals(0, transaction.pad(0)); // Already aligned
        assertEquals(0, transaction.pad(4)); // Already aligned
        assertEquals(0, transaction.pad(8)); // Already aligned
        assertEquals(3, transaction.pad(1)); // Need 3 bytes to align to 4

                pad = parameterOffset % PADDING_SIZE;
                pad = pad == 0 ? 0 : PADDING_SIZE - pad;
                parameterOffset += pad;
            }

            // caclulate parameterDisplacement before calculating new parameterCount
            parameterDisplacement += parameterCount;

            int available = maxBufferSize - parameterOffset - pad;

    }

    @Override
    protected int readBytesWireFormat(final byte[] buffer, int bufferIndex) throws SMBProtocolDecodingException {
        this.pad = this.pad1 = 0;
        if (this.parameterCount > 0) {
            bufferIndex += this.pad = this.parameterOffset - (bufferIndex - this.headerStart);

                }
                String progress = " [" + number + '/' + totalProjects + ']';

                int pad = lineLength - building.length() - progress.length();

                infoMain(building + ((pad > 0) ? chars(' ', pad) : "") + progress);
            }

            // path to pom.xml
            File currentPom = project.getFile();
            if (currentPom != null) {

            if (this.getCommand() == SMB_COM_TRANSACTION && !isResponse()) {
                this.parameterOffset += stringWireLength(this.name, this.parameterOffset);
            }

            this.pad1 = pad(this.parameterOffset);
            this.parameterOffset += this.pad1;

            this.totalParameterCount = writeParametersWireFormat(this.txn_buf, this.bufParameterOffset);

                }
                String progress = " [" + number + '/' + totalProjects + ']';

                int pad = lineLength - building.length() - progress.length();

                infoMain(building + ((pad > 0) ? chars(' ', pad) : "") + progress);
            }

            // path to pom.xml
            File currentPom = project.getFile();
            if (currentPom != null) {

                off += 27;
                resp.decode(BUF, 4);
                /* EMC can send pad w/o data */
                final int pad = r.dataOffset - off;
                if (r.byteCount > 0 && pad > 0 && pad < 4) {
                    readn(in, BUF, 4 + off, pad);
                }

                if (r.dataLength > 0) {

	if tw.err != nil {
		return tw.err
	}
	if nb := tw.curr.logicalRemaining(); nb > 0 {
		return fmt.Errorf("archive/tar: missed writing %d bytes", nb)
	}
	if _, tw.err = tw.w.Write(zeroBlock[:tw.pad]); tw.err != nil {
		return tw.err
	}
	tw.pad = 0
	return nil
}

// WriteHeader writes hdr and prepares to accept the file's contents.
// The Header.Size determines how many bytes can be written for the next file.