Re: Where to find the APIs in POI for reading the invisible digital signature info in Office Documents?
The private key will not be in the Excel file - because it is private. You may find the public key. However, if your original purpose is signature verification then why not use the POI functions to verify it:
> On 13. Sep 2018, at 05:09, 许 秋熹 <[hidden email]> wrote:
> Hi.I have create an Excel file(xlsx) and use Office 2010 to create invisible digital signature for it.
> Now I need to read the invisible digital signature info (maybe private key , public key or expire date )from the Excel file.