On 12/08/2015 03:08 am, Peter Gutmann wrote:
Werner Koch <wk(_at_)gnupg(_dot_)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
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