S32K CSEC

[wanglijun]

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]

Hi,

you can see in AN5401:

lukaszadrapa_0-1618907824798.png

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

lukaszadrapa_2-1618908032194.png

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

lukaszadrapa_3-1618908115961.png

Also this could be useful:

lukaszadrapa_4-1618908158905.png

Regards,

Lukas

[wanglijun]

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

[lukaszadrapa]

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

Regards,

Lukas