[okular] [Bug 469705] okular does not find any certificate for digital signing

[Sune Vuorela]

https://bugs.kde.org/show_bug.cgi?id=469705

--- Comment #28 from Sune Vuorela <kde at pusling.com> ---
(In reply to Philippe ROUBACH from comment #27)
> >> And you have your x509 certificates in your gpg store ?
> 
> why you speak about x509 certificate ?
> 
> I speak about gpg certificates. Those found and used by kmail, LibreOffice,
> kleopatra for digital signing.

openpgp certificates are not specified to be used for pdf files.

For that we need CMS -
https://en.wikipedia.org/wiki/Cryptographic_Message_Syntax - and CAdES - 
https://en.wikipedia.org/wiki/CAdES_(computing) - according to the pdf
specification section 12.8. 

I have not seen anyone specifying CMS with openpgp keys, only with x509
certificates.

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