Re: State of Argon2 support

[Patrick Steinhardt <ps@pks.im>]

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On Fri, Jan 26, 2024 at 03:18:57AM -0500, Nikolaos Chatzikonstantinou wrote:
> On Thu, Jan 25, 2024 at 1:15 PM Daniel Kiper <dkiper@net-space.pl> wrote:
> >
> > Adding Vladimir who knows GRUB history better than I...
> >
> > On Wed, Jan 24, 2024 at 01:23:55AM -0500, Nikolaos Chatzikonstantinou wrote:
> >
> > [...]
> >
> > > My apologies for the repeated messages, but I came up with just one
> > > more question that I'm curious about. To summarize my questions:
> > >
> > > 1. Where is the libgcrypt bundle from grub from? I think my
> > > investigation has led me around version 1.7.0 of libgcrypt, but if I
> > > can get a precise commit or version, that would be useful.
> > >
> > > ... and now to my new question:
> >
> > Vladimir, could you help with that?
> >
> > > 2. What is the reason libgcrypt is bundled as opposed to a regular dependency?
> >
> > I am not entirely sure I understand the question. Could you elaborate?
> 
> By bundling, I mean that someone copied libgcrypt files into the GRUB project.
> 
> To elaborate further, regular programs (not like GRUB which is a
> bootloader) can link statically or dynamically to libraries; but also,
> there's a third option, to dump the source code of a library directly
> into the source tree of the project. To my understanding this third
> option (which is not really a third linker option as it is not related
> to the linker) is chosen when the project needs to include its own
> patch set to the library. I am curious if GRUB has patched libgcrypt
> for some reason, and is that why libgcrypt is bundled with GRUB?

Yeah, the libgcrypt version carried by GRUB is heavily patched so that
it compiles within the non-libc environment that GRUB uses. That is the
whole crux of this topic -- if libgcrypt was simply a vanilla version
then it shouldn't be all that hard to update.

I think in the long term it would be great indeed if we could refrain
from patching libgcrypt to the widest extent possible so that future
updates become easier. I guess that would require something of a "shim"
header that makes available all of the prerequisites that are currently
missing for libgcrypt to compile.

Patrick

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