Re: [openpgp] SHA-x performance
ianG <iang@iang.org> Wed, 12 August 2015 13:23 UTC
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Subject: Re: [openpgp] SHA-x performance
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On 12/08/2015 03:08 am, Peter Gutmann wrote: > Werner Koch <wk@gnupg.org> writes: > >> Do you have a suggestion on what CPUs from low to high end to do benchmarks >> so to check which SHA variant is suitable? > > It'd be a longish list :-). I'm also not sure how easy it'll be to get at > them, this is all embedded-systems stuff so you can't just SSH into a box and > run the tests. In any case the most common is ARM Cortex M (and a few R), so > any Cortex M3 (the example I gave was an STM32 at 180MHz which admittedly is > the top end of the range, 100 or 80 Mhz would be another benchmark level, but > then they're all ARMv7-M so you can extrapolate from one clock speed to > another), then for PowerPC something like an MPC560x at 80 MHz (very common in > industrial and automotive), a PIC32MX (MIPS32) at 60 MHz, and then for exotica > maybe a NIOS II or MicroBlaze at 100 Mhz. You don't really need to do dozens > of variants since things mostly scale directly with clock speed, and in any > case those are reasonably representative clocks, at least for the faster devices > where power-saving isn't an issue. To what extent are we accepting the embedded market as "our market" ? Is this something that already exists in the sense that a lot of them are already doing OpenPGP signing for some purpose? Is the process things like signed updates, or are people using OpenPGP to encrypt and/or sign requests to the devices? Or, are we making a stab at the future: "IoT will need security systems, and OpenPGP will be used to supply that, so we'd better make sure it fits on the rough template of devices." To give a ludicrous counter-example, we could also optimise the future hash for smartcards. That's another big market, why not? I'd say this doesn't work mostly because the smartcard or tokens market is mostly closed, and systems are typically constructed to be tightly bound to the end-user application; generic systems such as OpenPGP would find it hard. Where do we draw the line? Are embedded / IoT inside? iang
- [openpgp] SHA3 algorithm ids. Werner Koch
- Re: [openpgp] SHA3 algorithm ids. Paul Wouters
- Re: [openpgp] SHA3 algorithm ids. Phillip Hallam-Baker
- Re: [openpgp] SHA3 algorithm ids. ianG
- Re: [openpgp] SHA3 algorithm ids. Phillip Hallam-Baker
- Re: [openpgp] SHA3 algorithm ids. ianG
- Re: [openpgp] SHA3 algorithm ids. Christoph Anton Mitterer
- Re: [openpgp] SHA3 algorithm ids. Phillip Hallam-Baker
- Re: [openpgp] SHA3 algorithm ids. ianG
- Re: [openpgp] SHA3 algorithm ids. Werner Koch
- Re: [openpgp] SHA3 algorithm ids. Peter Gutmann
- Re: [openpgp] SHA3 algorithm ids. Christoph Anton Mitterer
- Re: [openpgp] SHA3 algorithm ids. Stephen Farrell
- Re: [openpgp] SHA3 algorithm ids. ianG
- Re: [openpgp] SHA3 algorithm ids. Derek Atkins
- Re: [openpgp] SHA3 algorithm ids. Phillip Hallam-Baker
- Re: [openpgp] SHA3 algorithm ids. Werner Koch
- Re: [openpgp] SHA3 algorithm ids. ianG
- Re: [openpgp] SHA3 algorithm ids. Paul Wouters
- Re: [openpgp] SHA3 algorithm ids. Phillip Hallam-Baker
- Re: [openpgp] SHA3 algorithm ids. Peter Gutmann
- Re: [openpgp] SHA3 algorithm ids. Phillip Hallam-Baker
- [openpgp] Why or why not SHA{2,3}-512 (was: SHA3 … Werner Koch
- [openpgp] WWhy or why not SHA{2,3}-512 (was: SHA3… Werner Koch
- Re: [openpgp] SHA3 algorithm ids. Werner Koch
- Re: [openpgp] SHA3 algorithm ids. Werner Koch
- Re: [openpgp] SHA3 algorithm ids. Daniel Kahn Gillmor
- Re: [openpgp] SHA3 algorithm ids. Daniel Kahn Gillmor
- Re: [openpgp] SHA3 algorithm ids. Peter Gutmann
- [openpgp] SHA-x performance (was: SHA3 algorithm … Werner Koch
- Re: [openpgp] SHA-x performance (was: SHA3 algori… Daniel Kahn Gillmor
- Re: [openpgp] SHA-x performance (was: SHA3 algori… Peter Gutmann
- Re: [openpgp] SHA-x performance (was: SHA3 algori… Dang, Quynh
- Re: [openpgp] SHA-x performance Werner Koch
- Re: [openpgp] SHA3 algorithm ids. ianG
- Re: [openpgp] SHA-x performance Werner Koch
- Re: [openpgp] Why or why not SHA{2, 3}-512 (was: … Phillip Hallam-Baker
- Re: [openpgp] SHA-x performance Peter Gutmann
- Re: [openpgp] Why or why not SHA{2, 3}-512 Werner Koch
- Re: [openpgp] SHA-x performance ianG
- Re: [openpgp] SHA-x performance Phillip Hallam-Baker
- Re: [openpgp] SHA3 algorithm ids. Derek Atkins
- Re: [openpgp] SHA-x performance ianG
- Re: [openpgp] SHA3 algorithm ids. Phillip Hallam-Baker
- Re: [openpgp] SHA-x performance Bill Frantz
- Re: [openpgp] SHA-x performance Hilarie Orman
- Re: [openpgp] WWhy or why not SHA{2, 3}-512 (was:… Phillip Hallam-Baker
- Re: [openpgp] SHA-x performance NIIBE Yutaka
- Re: [openpgp] SHA3 algorithm ids. Derek Atkins
- Re: [openpgp] SHA-x performance Peter Gutmann
- Re: [openpgp] SHA3 algorithm ids. Bill Frantz
- Re: [openpgp] SHA3 algorithm ids. ianG
- Re: [openpgp] SHA3 algorithm ids. Derek Atkins
- Re: [openpgp] SHA3 algorithm ids. Bill Frantz
- Re: [openpgp] SHA3 algorithm ids. Phillip Hallam-Baker
- Re: [openpgp] SHA3 algorithm ids. Peter Gutmann
- Re: [openpgp] SHA3 algorithm ids. Andrey Jivsov
- Re: [openpgp] SHA3 algorithm ids. ianG
- Re: [openpgp] SHA3 algorithm ids. Robert J. Hansen
- Re: [openpgp] SHA3 algorithm ids. Werner Koch