}

    /**
     * Get the associated data for AEAD encryption (everything except signature)
     *
     * @return byte array containing associated data
     */
    public byte[] getAssociatedData() {
        final byte[] aad = new byte[52]; // Use full header size to ensure all data fits
        int index = 0;

        // Protocol ID
        SMBUtil.writeInt4(TRANSFORM_PROTOCOL_ID, aad, index);