Issue in Compatibilty with uECC and openssl

RE: Issue in Compatibilty with uECC and openssl

Mathangopal — Wed, 22 Sep 2021 03:15:41 GMT

Hi. Do you have any other library that works with openssl? Seems like there is a lot of issues with uECC. I can also use uECC library on the Qualcomm chip. I am using uECC_set_rng(&RAND_bytes) with the same private and public key however, the shared key is still different. RAND_bytes is a openssl random bytes generator is this compatible with the nrf random number generator? if no, can you share a random number generator function that I can use which is compatible with nrf.

RE: Issue in Compatibilty with uECC and openssl

Vidar Berg — Tue, 21 Sep 2021 11:44:38 GMT

Hi,

uECC is built to work with little-endian keys while openssl is big endian so that's probably the biggest difference. I have not tried to work with openssl myself but looks like it should be possible to make the keys compatible according to the discussion here: https://githubmemory.com/repo/kmackay/micro-ecc/issues/173

Best regards,

Vidar