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Date: Wed, 8 Jun 2011 05:05:09 +0200
From: Łukasz Odzioba <>
Subject: Re: Lukas's Status Report - #4 of 15

>> In the meantime I found cpu implementation called "fast md5-crypt" and
> Can you please post an URL for it (or otherwise share it with us)?
> A Google web search for "fast md5-crypt" doesn't appear to find it.
My fault, it was ultra fast crypt(3) i sugested md5 because files was
in the same directory as md5-based crypt. ufc-crypt is des based so it
wont help.

> You mean to the one in JtR?  BTW, bartavelle's code in 1.7.7-jumbo-5
> introduces a SIMD implementation.

I meant that, which is my base, which I dont like for the same reason
as sha256-based crypt version.

> Also, since the overall structure of SHA-crypt was based on MD5-crypt's,
> you may be able to reuse some approaches for SHA-crypt.
I am counting on that.

> OK.  Obviously, the bottleneck for fast hashes like this is different.
Good point, for slow hashes results should be better, but it's still
far away from needed 200-300% speedup.

>> Surprisingly I didn't stated any difference in coalescing operations
>> inside kernel.

Assuming that kernel:
reads password
compute hash
write hash to memory

I didn't noticed any difference in coalescing r/w operations while
computing hash. It is at least sizeof(64*uint) bytes so it cannot been
hidden in 18 registers used by whole kernel.

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