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Put a pgp signature in a pdf file

Sune Vuorela requested to merge svuorela/poppler:work/sune/pgp into master

Allow putting a pgp signature in a pdf file. This is not fully documented inside the specification, but basically it is replacing the CMS bundle as described with a pgp bundle.

These signatures are tagged in the g10c namespace (https://github.com/adobe/pdf-names-list/issues/45) and is only implemented in the GPGME backend as a 'whatever gpg understands'.

A special difference is that the signature is not padded with zeroes, but with a gpg comment packet with the exact size to fill the void.

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