RE: Softdevice Controller peripheral usage

user18631 — Mon, 15 May 2023 10:49:00 GMT

Alright, thank you. After some benchmarking, we've decided to go with sdc_soc_ecb_block_encrypt and do the cipher mode in software. (If anybody comes across this thread looking for CCM, Zephyr provides a software implementation that wraps the hardware primitive via BT_HOST_CCM)

RE: Softdevice Controller peripheral usage

Susheel Nuguru — Fri, 12 May 2023 05:36:25 GMT

Hi,

[quote user=""]Why is this the ECB peripheral and not the CCM peripheral? Judging from the peripheral IDs, those are separate IP blocks and for Bluetooth using the CCM peripheral would seem more natural.[/quote]

The Softdevice controller used in nRF Connect SDK uses both ECB and CCM. The usage documentation of CCM seems to be missing. I requested the internal team to update it or send us link if this is documented.already.

[quote user=""]Does the fact that the CCM peripheral does not appear in this list mean that it is available for application use?[/quote]

No, you cannot access CCM in the application directly outside the timeslot API.

[quote user=""]Since we are not using any kind of cryptography on the link, would this mean that the ECB peripheral is available for application use after all?[/quote]

No, The ECB and CCM peripherals are still protected even if the security is not enabled for a particular connection.