Random Number Generation used for Encryption

[Learner]

Hello,

I am using a third party chriptographic engine that provides a dedicated hardware accelerator for AES-128 encryption based algorithms.

I am using this engine to encrypt the data transmitted and received over RF. To make the data more secure I am looking at generating encryption 128-bits keys using a True Random Number Generator. Is there a way of achieving a true random number generation using nRF5340 or Zephyr?

Kind regards

Mohamed Belaroussi

[ketiljo]

There's a separate peripheral block that generates random numbers: https://infocenter.nordicsemi.com/topic/ps_nrf5340/rng.html

[Learner]

Thank you Ketiljo.

Would it be possible to point me to an example C code that uses this peripheral preferably under Zephyr?

Kind regards

Mohamed Belaroussi

[Learner]

Hi Ketiljo,

I found on DevZone that over a year ago someone mentioned this example "nrf_drv_rng_rand". Heidi was in fact assisting a developer with this. It sounds like it could be helpful to me. Where can I find it?

Kind regards

Mohamed

[Einar Thorsrud]

Hi Mohamed,

You can get random numbers from the CryptoCell peripheral using the Zephyr Entropy API. See the Entropy sample for reference.

Einar