linux-kernel - Re: [PATCH crypto] crypto: blake2s

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Date:   Fri, 27 May 2022 10:05:22 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        herbert@...dor.apana.org.au, gaochao <gaochao49@...wei.com>,
        Ard Biesheuvel <ardb@...nel.org>
Subject: Re: [PATCH crypto] crypto: blake2s - remove shash module

Hey Eric,

On Thu, May 26, 2022 at 11:01:34AM -0700, Eric Biggers wrote:
> On Thu, May 26, 2022 at 11:20:26AM +0200, Jason A. Donenfeld wrote:
> > BLAKE2s has no use as an shash and no use is likely to ever come up.
> 
> I'm not sure about that.  Anyone who is already using shash (for supporting

I'll tweak the language of the commit message.

> More importantly, this is removing quite a bit of test coverage because the
> extra self-tests in crypto/testmgr.c are more comprehensive than what
> lib/crypto/blake2s-selftest.c does.  For example they test the case where the
> input data is misaligned, as well as the case where the code is executed in a
> context where SIMD instructions are unavailable.
> 
> In order for this to be acceptable, I think you'd need to update
> blake2s-selftest.c to be more comprehensive.

There actually already is some alignment tests. But I'll add some more
and also compare implementations. v2 incoming.

Jason