CC310 and mbed TLS crypto engines performance issue.

[Srinivas V]

Hi Team,

We have used the "CC310" and "mbed TLS" both the crypto engines in my application with conditional compilation on NRF52840 soc.

We have measured the timings for both the engines for one of my BLE command and observed that CC310 taking more time compared to mbed TLS libraries.

We have used the " CC310 + CC310 RNG " and " mbed TLS + Crypto RNG module " in both scenarios.

Is there any thing else is causing CC310 is taking more time (2.8 sec) compared to mbed TLS ( 2.3 sec), generally CC310 Should take less time because it is purely hardware engine.

Is there any specific settings required for CC310 and mbed TLS like " sdk_config" file and pre-processor settings to work efficiently each engine within their intended performance.

Regards,

Srinivas.V

[Einar Thorsrud]

Hi Srinivas,

Generally, CC310 should be the fastest yes, but there can be some exceptions. Which crypto operation(s) are you using?

Also, if you use SHA-512(?) this is a special case since the CC310 does not have SHA-512 support in HW, and therefore this is done entirely in SW in the CC310 runtime library.

Einar