(In reply to comment #26)
> What's missing in gnutls is a way to parse all the relevant components of the
> PKCS#7 object as present in a PDF signature.
> 
> It seems that in gnutls they assume those objects can only contain 
> certificates
> and CRLs as you can confirm if you go through the functions that take
> gnutls_pkcs7_t as argument.
> 
> With openssl you can get the certificates, signature, and the digest of the
> signed content (these are the essential parts for detached signatures as used
> in PDF) as well as any optional timestamps or CRLs.

Would it be a lot of work to add support for that to gnutls?

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https://bugs.launchpad.net/bugs/740506

Title:
  verify digital signatures

Status in Poppler:
  Confirmed
Status in “poppler” package in Ubuntu:
  Triaged

Bug description:
  Binary package hint: evince

  This is a feature request to verify digital signatures.  I'm receiving more 
and more digitally signed PDF's and evince already acknowledges them with:
  Signature Not Verified
  Digitally signed by <signer>
  Date:  <time stamp>
  Reason: <reason>
  Location: <location>
  but it would be great if Evince would be integrated into the distro's 
ca-certificate infrastructure to verify these signatures.

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