Display a Root Certificate's authenticity on an Excel Spreadsheet

Hello,

I maintain a spreadsheet for my employer that has a considerable about of VBA code contained inside it. Me employer has purchased a root code certificate for me to include in this form to verify its authenticity to the users. I would like to add some code that displays a "Certified" logo on the form as long as the certificate is valid, but would remove the logo, or replace it with a different logo, or even display a dialog box if the code is broken. Are there any functions in Excel that check for valid certificates?

Thank you.