[openssl-users] RSA Key generation time
jb-openssl at wisemo.com
Tue Jan 24 16:10:42 UTC 2017
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
> On Tue, Jan 17, 2017 at 9:38 PM, Jakob Bohm <jb-openssl at wisemo.com
> <mailto:jb-openssl at wisemo.com>> wrote:
> On 17/01/2017 07:44, Mithun P wrote:
> 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
> 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
> 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.
Jakob Bohm, CIO, Partner, WiseMo A/S. https://www.wisemo.com
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