linux-kernel - Re: Accelerate GCM with PCLMULQDQ-NI

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Message-Id: <1238376995.6639.80.camel@yhuang-dev.sh.intel.com>
Date:	Mon, 30 Mar 2009 09:36:35 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Sebastian Andrzej Siewior <linux-crypto@...breakpoint.cc>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>
Subject: Re: Accelerate GCM with PCLMULQDQ-NI

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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