From: Huang Ying <ying.huang@intel.com>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Sebastian Andrzej Siewior <linux-crypto@ml.breakpoint.cc>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-crypto@vger.kernel.org" <linux-crypto@vger.kernel.org>
Subject: Re: Accelerate GCM with PCLMULQDQ-NI
Date: Mon, 30 Mar 2009 09:36:35 +0800 [thread overview]
Message-ID: <1238376995.6639.80.camel@yhuang-dev.sh.intel.com> (raw)
In-Reply-To: <20090329074326.GB11735@gondor.apana.org.au>
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On Sun, 2009-03-29 at 15:43 +0800, Herbert Xu wrote:
> On Wed, Mar 18, 2009 at 04:52:12PM +0800, Huang Ying wrote:
> >
> > To accelerate GCM with it, I make the following design:
> >
> > 1. Implement ghash as an ahash algorithm, Use ghash in gcm
> > implementation.
> > 2. Provide a new implementation of ghash with PCLMULQDQ-NI.
> >
> > What do you think about that?
>
> Sounds OK to me. I presume the choice of ahash instead of shash
> is due to the use of XMM registers, just like AES?
Yes, because PCLMULQDQ touches XMMs too. Just like AES, there is a raw
shash: ghash-clmul and an ahash via cryptd(ghash-clmul).
Best Regards,
Huang Ying
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prev parent reply other threads:[~2009-03-30 1:36 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-18 8:52 Huang Ying
2009-03-29 7:43 ` Herbert Xu
2009-03-30 1:36 ` Huang Ying [this message]
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