AES Encryption/Decryption nRF91 and the CRYPTOCELL

[stevenminnick]

I was looking for more information about hardware accelerated AES128 functions in the nRF9160.  We want to encrypt and decrypt data using this and was wondering if there are API's or examples using hardware accelerated features of the nRF91. 

A search of the forum lists information for the nrf52 line. 

A search of the infocenter for nrf91 just shows you the block for the CRYPTOCELL.

https://infocenter.nordicsemi.com/index.jsp?topic=%2Fps_nrf9160%2Fcryptocell.html&resultof=%22%41%45%53%22%20%22%61%65%22%20

Anyone have any sample projects or function call references that would point me in the right direction?

Thanks!

[jli157@intel]

The pull request is very helpful as a reference! I'll take a look and come back upon further questions. Thank you very much! 

[jli157@intel]

Hi Einar, one question about how to use the library: I'm trying to use entropy functions and I need to call the function `mbedtls_ctr_drbg_init`. However, I can't find the place for defining the macro `CONFIG_MBEDTLS_CTR_DRBG_ENABLED` in the test code.  Also, it seems I need to define my mutex functions and call the function `mbedtls_threading_set_alt` to set them to the mbedtls library. However, I can't find a any code defining these mutex functions and calling the function `mbedtls_threading_set_alt`.  Can you explain how I use the entropy functions? Thank you! 

[Einar Thorsrud]

Hi,

I need to look into this. The holiday season is upon us, so unfortunately I will probably not be able to get back to you regarding this until beginning of January.

[Einar Thorsrud]

Hi,

Did you make any progress these last two weeks?

If not, the CONFIG_MBEDTLS_CTR_DRBG_ENABLED is set via Kconfig, so typically prj.conf, as is the case in the PR I linked to. You can see an example of usage of mbedtls_ctr_drbg_init() here.

[jli157@intel]

Thanks! I see the macro `MBEDTLS_CTR_DRBG_ENABLED` could be defined in pro.conf. However, I can't find its definition in your examples. Anyway, I see the whole examples and will take a try again. Thank you!