itext-java VS pyHanko

iText 7

- excellent open source library for working with PDFs and digital signatures (incl. PDF ones): https://github.com/MatthiasValvekens/pyHanko

If you mean signing as in "adding a digital, cryptographic signature", you could use pyhanko () which provides everything state-of-the-art to do just that.

Document read from codimd-api https://github.com/hackmdio/hackmd-cli/blob/master/README.md - Matching config.yaml + styles read from git - Fetching data from CRM https://docs.espocrm.com/development/api/#client-implementations - Parsing markdown as jinja template - Generate pdf from markdown https://github.com/jmaupetit/md2pdf - Add signature fields https://github.com/MatthiasValvekens/pyHanko - store pdf file (maybe seafile?) (or nextcloud)

I don't think Okular supports PKCS#11 out of the box, but if you're OK with CLI tooling, this might suit your needs: https://github.com/MatthiasValvekens/pyHanko (full disclosure: I wrote that tool, so assume I'm biased).

Shameless plug: I'm the author of this tool: https://github.com/MatthiasValvekens/pyHanko/.

Certomancer started out as a weekend-long hacking session because I wanted to put the test suite for pyHanko on more solid foundations. I more or less knew where I wanted to go: I started by crafting a configuration file describing a somewhat involved testing configuration, and then implemented features incrementally until the tool was capable of handling the sample config I initially put together. This is the result.

If you aren't afraid of some command-line tooling, you can use pyHanko: https://github.com/MatthiasValvekens/pyHanko/. It's mainly a signing tool, but the library behind it supports literally every encryption scheme in the PDF standard. The CLI is a bit more restricted, but it'll probably still do the job in this particular case.