https://bugs.kde.org/show_bug.cgi?id=520496
Bug ID: 520496
Summary: Digital signatures are not displayed on the document
after signing
Classification: Applications
Product: okular
Version First 26.04.1
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: PDF backend
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 192521
--> https://bugs.kde.org/attachment.cgi?id=192521&action=edit
example form PDF document
DESCRIPTION
For some forms I can digitally sign a pre-prepared signature field and the
signature will show up as valid in the signature panel, but not on the actual
document.
STEPS TO REPRODUCE
1. Open the attached example form.
2. Click "Show Forms"
3. Click on the signature field at the bottom and sign through the signature
dialogue (hit "Ok", choose file name)
OBSERVED RESULT
On the newly created document the signature shows up as valid in the
"Signatures Panel" but the field on the document is empty.
EXPECTED RESULT
On the newly created document the signature shows up as valid in the
"Signatures Panel" and the field on the document displays my signature
text/graphics.
SOFTWARE/OS VERSIONS
Operating System (available in the Info Center app, or by running `kinfo` in a
terminal window):
KDE Plasma Version: 6.6.5
KDE Frameworks Version: 26.04.1
Qt Version: 6.11.1
ADDITIONAL INFORMATION
If I look at the terminal output, I can see that step 1 leads to
org.kde.okular.generators.pdf: [Poppler] "Error (0): Invalid or missing
Signature string"
Step 3 leads to many Poppler error messages, e.g. of the form
org.kde.okular.generators.pdf: [Poppler] "Error (111): Unknown operator
'<97><f7><8e>L<f2><a2>Jz<b9><ab>=<12>c#<88><ef><80><9e><13>z<0e><ce>J<06>F<f1><85><f6><e8><f9>i<f9><91>Y#8<92>,f<b9><d3>z<80>'"
org.kde.okular.generators.pdf: [Poppler] "Error (121): Illegal character '{'"
org.kde.okular.generators.pdf: [Poppler] "Error (611): Illegal character <d7>
in hex string"
...
(I can add a complete logfile)
I used to be able to digitally sign without problems with okular. I am not sure
what change caused this problem (a new system installation, or TU Dresden
updating their forms, or a regression in okular/poppler).
I also wonder whether this is related to some form entries not showing up as
reported in https://gitlab.freedesktop.org/poppler/poppler/-/work_items/1529
since I can also reproduce that problem and it sounds similar.
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