digitally sign fields with MuPDF-GL

digitally sign fields with MuPDF-GL

[Pablo Rodriguez]

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Dear list,

having the following sample code:

  \setuppapersize[A4, landscape]
  \setuplayout[page]
  \setupinteraction[state=start]
  \starttext
  \setupfield[sl][horizontal]
    [frame=off, width=\textwidth, height=\textheight]
  \definefield[x][signature][sl]
  \field[x]

I also attach a sample certificate with password ABCabc.

The binaries for Windows provided by Artifex do not provide SSL support.
I’m on Linux myself, and something like MSYS2 provides binaries with
support for Linux (https://packages.msys2.org/base/mingw-w64-mupdf). I
wonder whether Homebrew provides mupdf-gl (I cannot say from
https://formulae.brew.sh/formula/mupdf).

If I try to sign the output PDF with the previous password, using
mupdf-gl or "mutool sign" (version 1.2.2), the signature annotation is
only viewed by MuPDF, MuPDF-GL and SumatraPDF.

On Linux, neither Evince or xpdf can display the signature annotation.

On Windows, Acrobat Reader DC doesn’t display the signature annotation,
nor it shows any info about the document being signed (BTW, I used
another certificate for this).

If I open the unsigned document with Acrobat Reader DC and save it, then
mupdf-gl can sign the saved document that Acrobat can handle (both
annotation and signature info) and Evince and xpdf can display the
signature.

I guess what might be causing this issue and I’m investigating it.

But it would really help, if someone can confirm the issue with MuPDF-GL
(or "mutool sign") and Acrobat (Reader or not).

Many thanks for your help,

Pablo

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