PhpSpreadsheet - Can I add digital signature to xls file in PHP?

Question

I use https://github.com/PHPOffice/PhpSpreadsheet I need to add digital signature to xls document to verify authenticity of document. Is it possible with this or maybe other PHP library? Can anyone point me a direction how to do this?

Answer 1

Digital signatures are not supported in PhpSpreadsheet.

But in case you want macros signed with a certificate, then those are supported in PhpSpreadsheet Xlsx writer. But that feature is not documented. To understand how to use, refer to the commit that introduced it . It should be something like:

$spreadsheet->setMacrosCertificate($certificate);