ECC signature ECDSA on nRF9160

[Zhenchuan]

Hello,

Does nRF9160 support ECDSA key generation and signing? 

Is there any sample or document that I can start with?

Thanks

Zhenchuan

[Bjørn Kvaale]

Hi Zhenchuan,

Yes, there is ECDSA support, as can be seen in the nrf9160 product spec. I doubt there are any samples or documents at the moment, but I will check internally & get back to you soon.

Update: There is some documentation here that could be useful. This link could also be helpful.

[Zhenchuan]

Hi Bjørn,

Thanks for the update. The link is really helpful!

Thanks

Zhenchuan

[Bjørn Kvaale]

Hi Zhenchuan,

Thanks for that! I have another quick update: You might also want to checkout nrf_security module --> https://github.com/NordicPlayground/nrfxlib

Also, if you are using the cryptocell as the backend, remember that it's a secure-only peripheral on nRF91,  so he need to use secure services to access it.

[Zhenchuan]

Hi Bjørn,

Appreciate your update.

I have a follow-up question.

Now my understanding is that, in order to use CC310 ECDSA hardware functions, I may need to modify secure_services.c to exposed the ECDSA functions as part of secure services through SPM to my application. Right?

If so, taking the sample project /nrf/samples/nrf9160/secure_services as the template, I noticed the solution uses the source code ncs/nrf/subsys/spm/secure_services.c , which is in the common directory and shared by all other solutions.  So I think it may not be good practice to modify that code directly. Right?

Then how can I implement the secure service for my application? Can I implement both un-secure application with its accompanying secure service of SPM in the same solution in SES 4.18?

Thanks

Zhenchuan

[Bjørn Kvaale]

Hi Zhenchuan,

Very sorry for the delayed response. Did these two cases (link 1, link 2) answer your questions?

[Zhenchuan]

Hi Bjørn,

No worries! Yes, I got answered in those links!

Thanks

Zhenchuan