CESc question

814420552 — Fri, 06 Dec 2019 09:53:47 GMT

Dear all，

1. whether can i get the key value by software ,such as MASTER_ECU_KEY/BOOT_MAC_KEY/BOOT_MAC, KEY_<n> , RAM_KEY?

2.whether MASTER_ECU_KEY is 128 bits 1 when i get one new ecu?

3. if I update MASTER_ECU_KEY after I get one new ecu, but after long time I forget the new MASTER_ECU_KEY which last time updated, at this time how can i update MASTER_ECU_KEY and other key, and how to do it?

4. whether RAM key save in NVM? if yes, why after reset, RAM_KEY became empty?

wish your hep, thanks very much!!

Re: CESc question

jorge_a_vazquez — Mon, 09 Dec 2019 21:31:29 GMT

Hi kui wu

whether can i get the key value by software ,such as MASTER_ECU_KEY/BOOT_MAC_KEY/BOOT_MAC, KEY_<n> , RAM_KEY?

Those Keys are defined by the user, so you should know them before have them programmed.

whether MASTER_ECU_KEY is 128 bits 1 when i get one new ecu?

For a blank key, the key being updated has an initial value of “all 1s”.

if I update MASTER_ECU_KEY after I get one new ecu, but after long time I forget the new MASTER_ECU_KEY which last time updated, at this time how can i update MASTER_ECU_KEY and other key, and how to do it?

If you don't have the Master key, then you will not be able to update any other key, this MASTER_ECU_KEY is the only one that can update any other key.

whether RAM key save in NVM? if yes, why after reset, RAM_KEY became empty?

RAM_KEY is not saved in NVM, it is a volatile key and can be used for any arbitrary operations.

I recommend you check the application note AN5401:

https://www.nxp.com/webapp/Download?colCode=AN5401

Hope this info could help you.

Best regards

Jorge Alcala

S32K中的主题 Re: CESc question

CESc question

Re: CESc question