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Date: Mon, 2 Apr 2012 12:09:06 +0400
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: SHA-256 and SHA-512 implementations

On Sat, Mar 24, 2012 at 02:05:02AM +0400, Solar Designer wrote:
> I've just specified this as a task for GSoC 2012:
> 
> JtR: SIMD and bitslice implementations of SHA-512, SHA-256, SHA-crypt,
> other SHA-2 based JtR formats
> 
> The ideas page at http://openwall.info/wiki/ideas gives more detail on
> the task.
> 
> While doing it, I did another web search - and surprisingly I found a
> closely relevant paper that says it was published on February 13, 2012:
> 
> http://eprint.iacr.org/2012/067.pdf
> 
> Besides a novel idea of how a single SHA-2 digest may be computed with a
> SIMD parallelized implementation of the compression function

Upon a closer look, I was wrong about that: they parallelize message
scheduling, not the compression function.

> (great, but
> not needed for JtR in particular), this paper gives actual pieces of
> code with SSSE3 and AVX2 intrinsics (separately).  No license, though.
> I might e-mail the authors.

I just did.

Alexander

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