RE: Struggling with crypto examples

Pete W — Mon, 13 Jul 2020 10:45:24 GMT

Thanks for the reply. I've managed to get the CCM module working and have been able to test encryption/decryption with this, which was all I was looking for at this point. I thought there would be some simple examples for the ECB and CCM peripherals (without using backends) but there doesn't seem to be, but I found the one that Torbjørn did a few years, ago, which really helped.

Pete

RE: Struggling with crypto examples

Amanda Hsieh — Fri, 10 Jul 2020 12:59:56 GMT

Hi Peter,

[quote user=""] I keep getting an error about the external micro_ecc_lib_nrf52.a not being found. I'm guessing I have to build this, but this doesn't seem to be stated anywhere - the instructions for the examples are 'compile and program'.[/quote]

Please see the Installing micro-ecc documentation.

[quote user=""]1. Why is decryption functionality not included in the ECB?[/quote]

Please see this post.

[quote user=""]2. The crypto examples seem to pull in every possible backend and an inordinate number of extra files. I don't know where to start to add basic encryption & decryption to my project. Is there any guidance for getting a basic AES decryption working?[/quote]

Please see AES Example and its sdk_config.h.

[quote user=""]3. Am I correct in thinking that there is no driver for the CCM? I can only see the HAL file and the libraries.[/quote]

Yes, only the AES CCM HAL.

[quote user=""]3. Do I need to build all external backends, and if so why?[/quote]

No, see the Configuring nrf_crypto frontend and backends documentation.

The support staff is reduced during the summer holidays, and you may experience delayed answers.

-Amanda H.