I already have the hash digitally signed by an external provider, how can I insert it back into the original PDF?

[fedegalan]

I already have the hash digitally signed by an external provider, how can I insert it back into the original PDF?

[MatthiasValvekens]

Should probably put this in the FAQ, because this gets asked quite a lot ;)

This section in the docs should get you started: https://pyhanko.readthedocs.io/en/latest/lib-guide/signing.html#extending-signer

Also, mind the warning in this thread about how PDF signatures work.

[MatthiasValvekens]

I went ahead and added it to the FAQ just now: https://pyhanko.readthedocs.io/en/latest/faq.html#how-do-i-use-pyhanko-to-sign-pdfs-with-a-remote-signing-service.

[Dhopal]

Hey @fedegalan . I am also looking for a remote signer, maybe some kind of saas. Can you let me know the external service you are using and how your end to end flow looks like. Do you need to share your certificate with the external service?