linux-kernel - Re: [PATCH -mm crypto] AES: remove crypto_fl_tab and replace crypto_il_tab with isb

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Date:	Tue, 11 Mar 2008 14:47:21 +0800
From:	"Huang, Ying" <ying.huang@...el.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	"Adam J. Richter" <adam@...drasil.com>,
	Alexander Kjeldaas <astor@...t.no>,
	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org
Subject: Re: [PATCH -mm crypto] AES: remove crypto_fl_tab and replace
	crypto_il_tab with isb_tab

On Tue, 2008-03-11 at 12:42 +0800, Huang, Ying wrote:
> Remove crypto_fl_tab from aes implementation. Because mix_col(1,n) = n,
> all information in cryto_fl_tab is in crypto_ft_tab too.
> crypto_il_tab is replaced by isb_tab, the byte shift is done
> during decryption.
> 
> These changes reduce the encryption cache footprint to 50% and
> decryption cache footprint to 53.1%. The code size is increased
> slightly. On my Intel CORE micro-architecture CPU, there is almost no
> performance penalty.

Similar optimization is used by OpenSSL too. So I think this is
reasonable.

Best Regards,
Huang Ying


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