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I am looking for a working method to sign PDFs using the certificate from a signature card.

So what I need is either a program that signs PDFs in a way that is compatible to what AcroRead does on Microsoft, or a way to forward the signature card via rdesktop.

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  • Can you specify what format the signature card is in, and which kind of signature you want to apply?
    – AdminBee
    Oct 14, 2020 at 12:09
  • @AdminBee are there different formats?The driver for the cardreader is present and firefox has been manually instructed to load the shared lib that suports the signature.
    – schily
    Oct 14, 2020 at 12:53
  • Is LibreOffice available to you? It would seem to have such a function.
    – AdminBee
    Oct 14, 2020 at 13:05
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    OK, I would need to che check whether libreoffice recognizes my card and cardreader... Thank you for the hint. I will check this in a few days when I have time.
    – schily
    Oct 14, 2020 at 13:19

1 Answer 1

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If you already have your signature recognized by Firefox, then poppler can be used to sign PDFs with certificates:

  1. Install poppler (sudo apt install poppler-utils on Debian systems)
  2. List the signature nicknames available to you from Firefox:
pdfsig -list-nicks
  1. Apply the signature to the specified field in the document (either by field name or index in the document):
pdfsig -nick <NICKNAME> -sign <FIELD> <INPUT-PDF> <OUTPUT-PDF>

If you are looking to apply signatures to a document that does not have signature fields then that's also possible, but because of the way you asked your question I suspect that's not what you are looking for.

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