topic Re: S32K CSEC in S32K

S32K CSEC

wanglijun — Tue, 20 Apr 2021 05:57:48 GMT

Hello,

About the S32K CSEC module, after MCU production, the user key is empty.

And I select the authorizing key is KEY_N. Currently if update the key, what is the authorizing key value?

lukaszadrapa — Tue, 20 Apr 2021 08:43:05 GMT

Hi,

you can see in AN5401:

So, when MASTER_ECU_KEY is loaded first time, blank key is used as an authorizing key:

uint32_t BLANK_KEY_VALUE[4] = {0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF}; //When key value is not written it is all FFs

Once the MASTER_ECU_KEY is loaded, it's used for authorization of other keys:

Also this could be useful:

Regards,

Lukas

wanglijun — Tue, 20 Apr 2021 09:40:27 GMT

Hello, If I want to update the KEY_N at first, the process is same with MATER KEY, right? Thank you!

lukaszadrapa — Tue, 20 Apr 2021 12:01:10 GMT

As explained in the first screenshot from AN5401 above, yes.

Regards,

Lukas