I'm afraid you will have to look at the OpenSSL source code, I haven't
paid much attention to that CPU recently.
On 23/01/2017 08:09, Mithun P wrote:
Hi Jakob,
Can you please give me some reference/example of bignum optimization
which I can check on powerpc architectures.
Is this any specific instruction set addition? or something more generic?
Thanks & Regards
Mithun
On Tue, Jan 17, 2017 at 9:38 PM, Jakob Bohm <jb-open...@wisemo.com
<mailto:jb-open...@wisemo.com>> wrote:
On 17/01/2017 07:44, Mithun P wrote:
Hi
I have a embedded board P1010 RDB running openssl on VXWORKS
5.4 .
I am generating RSA 2048 and 3072 bit key pairs.
I am providing entropy to openssl by using RAND_seed from a HW
RNG.
My average generation time for RSA 2048 key pair is 2 Minutes
and 3072 is 8 minutes.
Is there a way to reduce the generation time?
I believe this is a CPU intensive operation (if VxWorks can do
this, try observing the CPU load during).
Potential improvements:
1. Check if the CPU specific bignum optimizations for your CPU
variant have been enabled via the libcrypto CPU detection code
(for example, there are optimizations for different ARM cortex
variants).
2. Faster CPU (expensive obviously).
3. Do the generation in the background before the keypair is
needed, at a time when the extra CPU load is less of a problem.
Enjoy
Jakob
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