linux-kernel - Re: [PATCH] crypto: twofish - add x86

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Message-ID: <20120528092505.211453i11cwxhp4w@naisho.dyndns.info>
Date:	Mon, 28 May 2012 09:25:05 +0300
From:	Jussi Kivilinna <jussi.kivilinna@...et.fi>
To:	Johannes Goetzfried 
	<Johannes.Goetzfried@...ormatik.stud.uni-erlangen.de>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
	Tilo Müller 
	<tilo.mueller@...ormatik.uni-erlangen.de>
Subject: Re: [PATCH] crypto: twofish - add x86_64/avx assembler
 implementation

Quoting Johannes Goetzfried  
<Johannes.Goetzfried@...ormatik.stud.uni-erlangen.de>:

> This patch adds a x86_64/avx assembler implementation of the Twofish block
> cipher. The implementation processes eight blocks in parallel (two 4 block
> chunk AVX operations). The table-lookups are done in general-purpose  
> registers.
> For small blocksizes the 3way-parallel functions from the twofish-x86_64-3way
> module are called. A good performance increase is provided for blocksizes
> greater or equal to 128B.
>
> Patch has been tested with tcrypt and automated filesystem tests.
>

It would be benefical to expand the twofish vectors in  
crypto/testmgr.h from 3 blocks
to 8 blocks so that 8-way algorithm(s) can be checked runtime. And  
while at expanding
test-vectors, why not just expand to 16 blocks... AVX2 is just one year away:
   
https://github.com/jkivilin/crypto-avx2/commit/1a72d7a6a1553aee70ad4b6a1980ca372181f40d

>
> Tcrypt benchmark results:
>
> Intel Core i5-2500 CPU (fam:6, model:42, step:7)

<snip>

> +/*
> + * Glue Code for AVX assembler version of Twofish Cipher
> + *
> + * Copyright (C) 2012 Johannes Goetzfried
> + *     <Johannes.Goetzfried@...ormatik.stud.uni-erlangen.de>
> + *
> + * Glue code based on twofish_sse2_glue.c by:
> + *  Copyright (C) 2011 Jussi Kivilinna <jussi.kivilinna@...et.fi>

I think you mean serpent_sse2_glue.c :)

-Jussi


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