Re: [PATCH v7] lib/crypto: blake2s: include as built-in

[Eric Biggers]

On Wed, Jan 05, 2022 at 11:01:04PM +0100, Ard Biesheuvel wrote:
> On Wed, 5 Jan 2022 at 22:53, Eric Biggers <ebiggers@xxxxxxxxxx> wrote:
> >
> > On Tue, Jan 04, 2022 at 06:02:52PM +0100, Ard Biesheuvel wrote:
> > > The only downside here is that the ARM/x86 accelerated shashes and the
> > > generic shash now use the same core transform, right?
> >
> > I don't see how this is the case, given that crypto/blake2s_generic.c still uses
> > blake2s_compress_generic(), not blake2s_compress().
> >
> 
> Ah ok, I stand corrected then.
> 
> So what are your thoughts on this? Should we keep the shashes while
> they have no users?

I don't know.  Removing unused stuff is good per se, but I wouldn't have
expected this to be something that is being considered here.  It's not like this
is a "controversial" algorithm, blake2b is already supported, and there could be
users of it already (dm-integrity, dm-verity, AF_ALG, etc.).  If this is going
to happen, then the acceptance criteria for new algorithms need to get *much*
stricter, so that algorithms aren't constantly being added and removed.

- Eric