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Date: Mon, 7 Jan 2013 03:52:56 +0100
From: magnum <john.magnum@...hmail.com>
To: john-dev@...ts.openwall.com
Subject: Re: BLAKE2 (was: New plugin load order magic)

On 5 Jan, 2013, at 6:03 , Solar Designer <solar@...nwall.com> wrote:
> On Sat, Jan 05, 2013 at 10:00:10AM +0530, Dhiru Kholia wrote:
>> Speed using XOP on FX-8120. There is lot of improvement but I was
>> expecting more.
> 
> Yeah.  As you might have noticed, I exchanged some tweets with @aumasson
> and @sevenps on this a couple of weeks ago.  There's not enough
> parallelism in one instance of BLAKE2 to fully hide Bulldozer's
> instruction latencies.  Things are much better on Sandy Bridge.
> 
> So we'll need to do our own interleaved instructions for multiple
> instances for cracking these hashes faster, much like we do for
> MD4/MD5/SHA-1.



Jim,

Do you feel like taking a stab at interleaving per above? I think you are best suited among us. Also, I am not sure raw-blake2 will currently build on non-SIMD platforms, although this should be a trivial fix (there is generic code present too).

magnum

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