[NTG-context] digital signing in ConTeXt

[Pablo Rodriguez via ntg-context <ntg-context@ntg.nl>]

Dear list,

the latest version of LMTX can digitally sign PDF documents. It requires
OpenSSL installed (since it does the crypto part).

I have two issues that I would like to be tested by others.

A sample certificate may be found at
https://mailman.ntg.nl/archives/list/ntg-context@ntg.nl/message/ECSXLVMT3TMQBIHA2UZJPWJN7OVV5334/attachment/2/mycert.pfx
(I sent it myself).

Here is a sample document (actually provided by Hans):

  \setupinteraction[state=start]
  \definefield[signature][signed]
  \defineoverlay[signature][my signature]
  \starttext
    \startTEXpage[offset=1ts,frame=on,framecolor=darkblue]
      sign: \inframed[background=signature,framecolor=darkred]
              {\fieldbody[signature][width=3cm,option=hidden]}
    \stopTEXpage
  \stoptext

After compiling the sample, you need to run:

mtxrun --script pdf --sign --certificate=c.pfx --password=ABCabc doc.pdf

Password will be prompted again ("ABCabc"), since it is an encrypted
certificate (also for the public 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]).

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?

Many thanks for your help,

Pablo
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