Hi Mithun,
>> 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.
I noticed embedded board key generation times vary by OS and OpenSSL
version after converting a Altera Atlas FPGA SoC HPS from original 2013
Yocto Linux to latest Ubuntu. Under the old Yocto, key generation
occasionally took up to 2 minutes. Same board under Ubuntu 16.04, 2048
RSA keys take consistently 2-5 seconds, while 3072 keys need around 8-16
seconds. Even running the system single core, the numbers don't change
(on a low utilized system, using OS built-in /dev/urandom).
While I am on a different CPU and OS (32bit ARM v7 900Mhz dual core,
1GB 400Mhz RAM), your e500 PowerPC can't be to far behind. Your numbers
seem to be off by a magnitude. You mentioned using a external HW RNG,
could that be it?
Cheers,
Frank
Jakob Bohm <mailto:jb-open...@wisemo.com>
Wednesday, January 25, 2017 1:10 AM
I'm afraid you will have to look at the OpenSSL source code, I haven't
paid much attention to that CPU recently.
Enjoy
Jakob
Mithun P <mailto:getmith...@gmail.com>
Monday, January 23, 2017 4:09 PM
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
Jakob Bohm <mailto:jb-open...@wisemo.com>
Wednesday, January 18, 2017 1:08 AM
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
Mithun P <mailto:getmith...@gmail.com>
Tuesday, January 17, 2017 3:44 PM
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?
Regards
Mithun
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