From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756171AbZC3Bgz (ORCPT ); Sun, 29 Mar 2009 21:36:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756302AbZC3Bgo (ORCPT ); Sun, 29 Mar 2009 21:36:44 -0400 Received: from mga03.intel.com ([143.182.124.21]:62611 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753216AbZC3Bgm (ORCPT ); Sun, 29 Mar 2009 21:36:42 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.38,443,1233561600"; d="asc'?scan'208";a="125470523" Subject: Re: Accelerate GCM with PCLMULQDQ-NI From: Huang Ying To: Herbert Xu Cc: Sebastian Andrzej Siewior , "linux-kernel@vger.kernel.org" , "linux-crypto@vger.kernel.org" In-Reply-To: <20090329074326.GB11735@gondor.apana.org.au> References: <1237366332.24215.260.camel@yhuang-dev.sh.intel.com> <20090329074326.GB11735@gondor.apana.org.au> Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=-ZT24eGYiBapoGWK5d4tS" Date: Mon, 30 Mar 2009 09:36:35 +0800 Message-Id: <1238376995.6639.80.camel@yhuang-dev.sh.intel.com> Mime-Version: 1.0 X-Mailer: Evolution 2.22.3.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-ZT24eGYiBapoGWK5d4tS Content-Type: text/plain Content-Transfer-Encoding: quoted-printable 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: > >=20 > > 1. Implement ghash as an ahash algorithm, Use ghash in gcm > > implementation. > > 2. Provide a new implementation of ghash with PCLMULQDQ-NI. > >=20 > > What do you think about that? >=20 > 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 --=-ZT24eGYiBapoGWK5d4tS Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) iEYEABECAAYFAknQIh8ACgkQKhFGF+eHlpjiyQCdGZnZKSWJiZpyQET0G2m66wvC UAsAnii91nPpLBW1pHWMKdt5aAIhMn0+ =PIwQ -----END PGP SIGNATURE----- --=-ZT24eGYiBapoGWK5d4tS--