Tom Biggs wrote:
>
> I'm writing an ENGINE wrapper for our new hardware.
>
> Currently, the hardware does not have a CRT version
> of modexp. I see from the Atalla ENGINE that this
> is not critical - one can simply ignore the component
> primes p,q and just do a standard modexp.
>
> Does anyone have any knowledge of the relative
> speed of RSA decryption in hardware between
> CRT modexp and non-CRT modexp? Or links to
> papers describing actual working hardware
> implementations with actual timing data?
>
If you just implment bn_modexp and leave the standard rsa_modexp in
place OpenSSL should implement the CRT using your supplied modexp but do
a few BN operations in software.
You can then compare the two. The CRT version is quite a bit quicker. I
can vaguely recall testing this a while ago and it being twice as quick.
> Is there any way to find out what is the most-used
> key-exchange algorithm? RSA? Any way to at
> least estimate?
>
Key exchange, as in SSL? If so then RSA is by far the most used, largely
because the usual browers don't support DH.
Steve.
--
Dr Stephen N. Henson. http://www.drh-consultancy.demon.co.uk/
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