[19448] in cryptography@c2.net mail archive
Re: crypto for the average programmer
daemon@ATHENA.MIT.EDU (Jack Lloyd)
Tue Dec 27 22:18:57 2005
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Date: Tue, 27 Dec 2005 20:59:33 -0500
From: Jack Lloyd <lloyd@randombit.net>
To: cryptography@metzdowd.com
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In-Reply-To: <43B14F77.3020306@algroup.co.uk>
On Tue, Dec 27, 2005 at 02:28:07PM +0000, Ben Laurie wrote:
> Apparently this rather depends on platform and compiler options. I am
> reliably informed that GMP is not always faster.
>
> For those that really care it'd be cool if someone did a careful
> comparison. It would also be interesting to know why they differ.
Thank you for the correction. My statement was primarily on the basis of some
benchmarks I ran at the time I wrote some backend code in Botan to dump crypto
operations to GNU MP and/or OpenSSL when available, and at the time GNU MP
outperformed OpenSSL by a fairly large margin on x86 and Alpha machines (up to
50% on large RSA private key operations; as the keys got smaller the
performance difference reduced, down to basically nothing at 512 bit
keys). However I have since checked my changelogs and realized I must have run
those tests almost two years ago now (which surprised me a bit!), so I'm sure
those results are not particularly reflective of current performance. I'll have
to revisit this and see how things stack up these days on the platforms I care
about.
-Jack
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