[Poppler-bugs] [Bug 16770] support for digital signatures

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=16770

--- Comment #107 from Markus Kilås <digital at markuspage.com> ---
(In reply to Markus Wernig from comment #104)
> I think the correct statement to issue in this case would be that a part
> ("revision") of the PDF has been signed and to show the validation result
> for that revision, ideally giving the user a chance to view only the signed
> part.
> 
> This might even be indispensable when there are multiple signatures applied
> to the document.

So one idea could be to also use the first offset when checking the signature
and in case it is not zero instead of return the status as SIGNATURE_VALID say
something like "SIGNATURE_PARTLY_VALID".

The pdfsig tool already implements support for multiple signatures/"revisions"
but it seems the API does not expose the ByteRange for which the signature
covers nor provides an other way to obtain that revision of the document (?).

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