[okular] [Bug 483678] New: Signing with Luxtrust's non-repudiation certificate just hangs

[Alain Knaff]

https://bugs.kde.org/show_bug.cgi?id=483678

            Bug ID: 483678
           Summary: Signing with Luxtrust's non-repudiation certificate
                    just hangs
    Classification: Applications
           Product: okular
           Version: 22.12.2
          Platform: Debian stable
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: kde at kde.lka.org.lu
  Target Milestone: ---

SUMMARY
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STEPS TO REPRODUCE
1. Connect Smart card reader with Luxtrust card to computer
2. View PDF form using okular
3. Click "show signatures panel"
4. In signatures panel, right click and chose sign
5. When asked, enter smart card's PIN
6. Chose LuxTrusV5: User Cert Sig (i.e. the certificate for "Non Repudiation"
rather than "Digital Signature, Encrypt Keys"
7. Click Ok

OBSERVED RESULT

okular just freezes :-(
okular's UI no longer refreshes, and okular needs to be killed with Control-C
No diagnostic on stdout/stderr (except unrelated "evaluate() threw an
exception" due to "This PDF file requires a newer version of Adobe Acrobat
Reader DC." popup at document load)

EXPECTED RESULT

It should sign the document and allow me to save it. Or if not possible /
allowed, plainly state why in a popup.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System) menu item not present
KDE Plasma Version: 142
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8

ADDITIONAL INFORMATION

- Signing using the second certificate on the same smartcard works just fine
- Signing using a PKCS12 certificate (file-based, rather than card) just works
fine too

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