Soft Crypto mbed TLS timing issues.

RE: Soft Crypto mbed TLS timing issues.

Einar Thorsrud — Mon, 27 Jul 2020 13:37:43 GMT

Hi Srinivas,

I am sorry for the late reply.

As you need some algorithms that are not supported by nrf_oberon, but also want to get higher performance on some operations than what you would get using mbed TLS, I suggest you use both. the nRF Crypto library lets you combine backends in any way you want, as long as you make sure to not enable the same algorithm in multiple backends. So you can use Oberon for any algorithms where it performed best, and use mbed TLS or micro-ecc where that is more appropriate (or the only alternative).

RE: Soft Crypto mbed TLS timing issues.

Srinivas V — Thu, 09 Jul 2020 10:51:03 GMT

Hi Einar,

Thanks for your reply.

We need the crypto functionalities like AES-ECB, CFB, CBC-MAC , therese are supported in OBERON library , that is the reason we have used the mbed TLS.

For ECC functionalities we are using the Micro-ECC library. You have any better thoughts on this.

Regards,

Srinivas.V

RE: Soft Crypto mbed TLS timing issues.

Einar Thorsrud — Mon, 22 Jun 2020 15:12:21 GMT

Hi Srinivas,

Assuming you have configured the toolchain with a sensible set of optimizations (typical release configuration), then there is not much more you can do to improve the speed of the mbed TLS operations. However, I suggest you re-do the tests using the nrf_oberon backend instead, as that generally has significantly better performance.

Einar