Differences between RNG drivers

RE: Differences between RNG drivers

Zoptune — Thu, 25 Apr 2019 07:37:02 GMT

Ok everything is clear now, thank you :)

RE: Differences between RNG drivers

Einar Thorsrud — Thu, 25 Apr 2019 07:33:41 GMT

Yes, the memory impact is higher with nrf_crypto_rng compared to using the RNG peripheral directly. To what degree depend on which backed you use. But that only matters if your design is memory constrained.

RE: Differences between RNG drivers

Zoptune — Thu, 25 Apr 2019 07:18:36 GMT

Hi and thank you for your clear answer. I now understand.

I think that the memory impact is higher with the nrf_crypto_rng. Am I wrong ?

Thanks

RE: Differences between RNG drivers

Einar Thorsrud — Wed, 24 Apr 2019 14:41:56 GMT

Hi,

The nrf_drv_rng uses nrfx_rng for low level handling of the RNG, but provide a more user-friendly API. the nrf_crypto_rng is an even higher level API that is uniform across the RNG peripherals (CC310 RNG and nRF RNG). Moreover, this supports using the RNG peripheral to seed a CTR-DRBG algorithm, which is why you get better performance. I recommend using nrf_crypto_rng unless you have a good reason not to (I cannot think of any).