From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: Guix build side - including modules (guix hash),
	(guix gcrypt): How to provide shared library?
Date: Mon, 02 Jan 2017 23:03:34 +0100
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	(David Craven's message of "Mon, 2 Jan 2017 15:31:31 +0100")
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To: David Craven <david@craven.ch>
Cc: guix-devel <guix-devel@gnu.org>

David Craven <david@craven.ch> skribis:

>> Also, why is sha256 used via FFI via an external library? It's not exact=
ly difficult to implement in Guile :P
>
> I'm not sure we want to write our own crypto primitives... And it's
> not quite as trivial, I don't know or care what a Newton-Raphson
> algorithm is ;)
> http://stackoverflow.com/questions/24093199/a-pure-scheme-implementation-=
r5rs-of-sha256

I suspect it would be slow with Guile 2.0, and (guix hash) is used in
performance-critical locations.

That said, if there=E2=80=99s a need for it on the build side where perform=
ance
does not matter much, it makes sense to add a pure-Scheme
implementation.  I think Weinh=C3=B6lt=E2=80=99s Industria library has one.

Alternately, we could make it easier to import (guix hash).  All we need
is to create a custom (guix config) module where =E2=80=98%libgcrypt=E2=80=
=99 is found
to the right thing, or something like that.

HTH!

Ludo=E2=80=99.