Re: Linus' sha1 is much faster!

[Nicolas Pitre <nico@cam.org>]

On Mon, 17 Aug 2009, George Spelvin wrote:

> If it helps anyone resolve license issues, here's a from-FIPS-180-2
> implementation that's placed in the public domain.  That should be
> compatible with any license.
> 
> It uses Linus's and Artur's performance ideas, and some of Linus' macro
> ideas (in the rotate implementation), but tries to be textually different.
> Is there anything recognizable that anyone cares to clam copyright to?
> 
> It's not quite 100% finished, as I haven't benchmarked it against Linus's
> code yet, but it's functionally correct.
> 
> It's also clean with -W -Wall -Wextra.
> 
> TODO: Check if an initial copy to w[] is faster on i386 (less register
> pressure).
> 
> /*
>  * Secure Hash Algorith SHA-1, as published in FIPS PUB 180-2.
>  *
>  * This implementation is in the public domain.  Copyright abandoned.
>  * You may do anything you like with it, including evil things.
>  *
>  * This is a rewrite from scratch, based on Linus Torvalds' "block-sha1"
>  * from the git mailing list (August, 2009).  Additional optimization
>  * ideas cribbed from
>  * - Artur Skawina (x86, particularly P4, and much benchmarking)
>  * - Nicilas Pitre (ARM)

Please be careful to spell my name correctly.


Nicolas