linux-kernel - Re: drivers/char/random.c: More futzing about

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Message-ID: <5398F7F9.9000106@zytor.com>
Date:	Wed, 11 Jun 2014 17:44:41 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"H. Peter Anvin" <hpa@...ux.intel.com>,
	"Theodore Ts'o" <tytso@....edu>,
	George Spelvin <linux@...izon.com>,
	linux-kernel@...r.kernel.org, mingo@...nel.org, price@....edu
Subject: Re: drivers/char/random.c: More futzing about

On 06/11/2014 01:41 PM, H. Peter Anvin wrote:
> On 06/11/2014 12:25 PM, Theodore Ts'o wrote:
>> On Wed, Jun 11, 2014 at 09:48:31AM -0700, H. Peter Anvin wrote:
>>> While talking about performance, I did a quick prototype of random using
>>> Skein instead of SHA-1, and it was measurably faster, in part because
>>> Skein produces more output per hash.
>>
>> Which Skein parameters did you use, and how much stack space was
>> required for it?  Skein-512 is described as needing 200 bytes of
>> state, IIRC (which I assume most of which comes from Threefish key
>> schedule). 
>>
> 
> I believe I used Skein-256, but I'd have to dig to find it again.
> 
> 	-hpa
> 

Sadly I can't find the tree, but I'm 94% sure it was Skein-256
(specifically the SHA3-256 candidate parameter set.)

	-hpa


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