[NTG-context] Re: digital signing in ConTeXt

[Henning Hraban Ramm <texml@fiee.net>]

Am 17.06.24 um 19:51 schrieb Pablo Rodriguez via ntg-context:
> Dear list,
> 
> the latest version of LMTX can digitally sign PDF documents. It requires
> OpenSSL installed (since it does the crypto part).
> 
> Could anyone confirm the following issues?
> 
> 1. The signature I get is wrong, unless I apply this patch
> (https://mailman.ntg.nl/archives/list/dev-context@ntg.nl/message/T3OCKVZWTUTIXCSOKIFRVJ4X76MROZHE/attachment/3/byterange.diff
> [sent by myself to the devel list]).

Can confirm.

Before patching, I checked with …
– Acrobat Reader: doesn’t recognize a signature
– Foxit Reader: "a signature is invalid"

> 2. I cannot get any signature display in Acrobat. Does any PDF viewer (I
> have tested this with pdfsig from poppler and MuPDF-GL) display the
> digital signature at all?

After patching, I checked with …
– Acrobat Reader: doesn’t recognize a signature
– Foxit Reader: "there’s something wrong with a signature" (i.e. 
different message)
– Apple Preview: doesn’t handle signatures at all
– PDF Studio Pro 2023: shows signature, "don’t know if valid, issuer 
unknown" etc.
– Master PDF Editor: can edit form fields, but doesn’t handle signatures
– Skim: doesn’t handle signatures

Hraban
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