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pdfsig: Sign form signature fields with an appearance

Open Erich Hoover requested to merge ehoover/poppler:master into master

The last patch in this set adds support for pdfsig to add the "appearance" to a PDF document when signing an existing signature field, for example: image

The patches leading up to that fix various issues I encountered trying to do this:

  • using a signature field that's not attached to a form (patches 1-3) [doing this to work around Issue #1280]
  • obtaining the signer name when signing_cert is set and CMSSignerInfo is not (patch 4)