[okular] [Bug 435260] New: Strange checking for signing bounds

[Oleg Solovyov]

https://bugs.kde.org/show_bug.cgi?id=435260

            Bug ID: 435260
           Summary: Strange checking for signing bounds
           Product: okular
           Version: 20.12.3
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: mcpain at altlinux.org
  Target Milestone: ---

Created attachment 137267
  --> https://bugs.kde.org/attachment.cgi?id=137267&action=edit
signed PDF

SUMMARY
As far as I can see in the code, only byteRange.last() and byteRange.first()
are used.

That's strange because of:
$ pdfsig ul-1172651010388-20210402102439.pdf 
Internal Error (0): couldn't find default Firefox Folder
Digital Signature Info of: ul-1172651010388-20210402102439.pdf
[...]
  - Signed Ranges: [0 - 23225], [31227 - 167454]

Signed Ranges becomes in pairs. Thus, when getting signed data, okular will
treat the whole PDF file to be signed, which is not the case.

I'm preparing a patch now, which will get this issue solved.

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