Revealed salary, now they want detail

Hi there, Made the mistake of disclosing current package to HR in discussions for a new job before they offer. I didn't embellish but I did include bonus (which has always paid out in full and extra than contracted amount) and all the other extras (incl extra week of leave). They've now asked for clarification but I know they'll just use the information against me and try and dismiss the bonus etc... How can I politely decline providing the details without looking like I'm lying about my package, even though I'm not?

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