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| H A D | rsa.c | 7910f4d89008cedd0176c4091bb8b8c17812a003 Fri Aug 12 13:35:55 UTC 2022 Lars Persson <larper@axis.com> core: mbedtls: Use a DRBG to speed up RSA key generation
The output rate of a TRNG is quite slow and this has a big impact
on the time needed to generate an RSA key since that process does
require a lot of random bits to find prime numbers.
We instantiate a CTR DRBG that is seeded from the TRNG to provide a
higher-speed source of random bits.
Performance comparison for rsa 2048 key generation on our device
with a TRNG that outputs on the order of 1e5 bits per second.
Before patch (14 samples)
mean time 14.02 sec stddev. 7.91
With patch (14 samples):
mean time 1.67 sec stddev. 1.24
Reviewed-by: Joakim Bech <joakim.bech@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Lars Persson <larper@axis.com>
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