https://bugs.documentfoundation.org/show_bug.cgi?id=156082

            Bug ID: 156082
           Summary: PDF Signature: Unknown signature part opening file
                    signed by Hungarian AVDH service
           Product: LibreOffice
           Version: 6.2.0.3 release
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Draw
          Assignee: libreoffice-bugs@lists.freedesktop.org
          Reporter: kelem...@ubuntu.com
            Blocks: 105605, 113122

Created attachment 188110
  --> https://bugs.documentfoundation.org/attachment.cgi?id=188110&action=edit
Signed PDF from AVDH service

Attached document was signed by the https://magyarorszag.hu/avdh document
signing service.
When opened in LO, Draw sees two digital signatures, but one of them is not
working, no details are shown about it.

1. Open attached document in Draw
2. Notice the infobar shows "This document has invalid signatures" warning.
3. Push the Show Signatures button
4. In the Digital Signatures dialog there are two signatures listed: one by
AVDH Sign which is valid in itself, and one without any information.

When opened in a browser, it lists one attachment which is a 1 page document.
Maybe this part is misunderstood.

Version: 24.2.0.0.alpha0+ (X86_64) / LibreOffice Community
Build ID: df29592493367bc03c9602c924711852eecf64c4
CPU threads: 8; OS: Linux 5.4; UI render: default; VCL: gtk3
Locale: hu-HU (hu_HU.UTF-8); UI: en-US
Calc: threaded

Note: the AVDH Signature requires two root CAs to be imported into the Firefox
certificate store: from the
https://hiteles.gov.hu/cikk/22/szolgaltatoi_tanusitvanyok site: 
http://qca.hiteles.gov.hu/cer/GOVCA-ROOT.cer (RSA Főtanúsítványkiadó) and
http://qca.hiteles.gov.hu/cer/GOVCA-Qv2.cer (Minősített Tanúsítványkiadó v2)


Referenced Bugs:

https://bugs.documentfoundation.org/show_bug.cgi?id=105605
[Bug 105605] [META] Digital signatures bugs and enhancements
https://bugs.documentfoundation.org/show_bug.cgi?id=113122
[Bug 113122] [META] PDF bugs and enhancement
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