nRF9160DK Cryptography

[Gioele]

Hi!
I'm trying to encrypt some data using ECC 256 but I have some issues:

-I found a code (https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.9.1/nrf/samples/crypto/ecdsa/README.html) in the Devzone that works with TFM but when I'm trying to set the code for the SPM it works only in the secure domain. How can I use this type of encryption for some data created in the non-secure domain?

-This guide https://infocenter.nordicsemi.com/index.jsp?topic=%2Fps_nrf9160%2Fcryptocell.html&cp=2_0_0_5_0 explain to me how this encryption/decryption works or it is also an alternative for the code that I found?

Thanks

[Vidar Berg]

Hi,

I recommend using TF-M if you are going to use the cryptocell from the non secure domain. Otherwise you will have to implement your own secure services for SPM.

-This guide https://infocenter.nordicsemi.com/index.jsp?topic=%2Fps_nrf9160%2Fcryptocell.html&cp=2_0_0_5_0 explain to me how this encryption/decryption works or it is also an alternative for the code that I found?

This is the documentation of the cryptocell module used to accelerate crypto operations in HW. TF-M uses this module by default.  

[Gioele]

I can't use TF-M because my project is now divided into two parts, secure and non-secure. I need to make work the cryptography in the non-secure part!

[Vidar Berg]

Yes, TF-M runs in the secure domain, and the app in the non-secure domain. It replaces SPM.

[Gioele]

Now I try, thanks!