https://devzone.nordicsemi.com/f/nordic-q-a/56012/can-i-change-the-crypto-backend-of-ble-controller-in-softdeviceI want to use mbed TLS backend in BLE stack. For example, BLE controller will use AES(hardware accelerator, I think) to gennerate link key and encrypt. I know that SoftDevice is not opensource, so I want to know if it&#39;s possible to change the Cryptoen-USTelligent Community 13Fri, 27 Dec 2019 14:06:33 GMThttps://devzone.nordicsemi.com/thread/226939?ContentTypeID=1Fri, 27 Dec 2019 14:06:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4c3350fc-ba8c-4765-8f17-b5f76ccf3ad6Vidar Berg<p>The CCM (<a href="https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/ccm.html?cp=4_2_0_28#topic">CCM — AES CCM mode encryption</a>)&nbsp;peripheral provides on the fly encryption/decryption of data transmitted or received by the RADIO, so it&#39;s purely HW. Although you could use Mbed TLS for the key exchange during LESC pairing.</p><div style="clear:both;"></div>