[Poppler-bugs] [Bug 104881] New: Add ability to extract signature information (PKCS #7) to tools

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104881

            Bug ID: 104881
           Summary: Add ability to extract signature information (PKCS #7)
                    to tools
           Product: poppler
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: utils
          Assignee: poppler-bugs at lists.freedesktop.org
          Reporter: hanno at hboeck.de

Created attachment 137081
  --> https://bugs.freedesktop.org/attachment.cgi?id=137081&action=edit
sigdump patch

It would be very helpful if one of the poppler utils supported extracting
signatures from PDF files. I looked quite a bit and it seems there's no other
free pdf tool currently capable of doing this.

I'll attach a quick+dirty patch I got from Tavis Ormandy which adds a "sigdump"
tool that does this and writes a PKCS #7 object to a file. However this is just
an example, I guess a more elegant solution would be to have a parameter to the
pdfsig tool that extracts a signature to a file.

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