S32 SDKのトピックRe: CSEc key load result

CSEc key load result

yqs77 — Wed, 22 Jun 2022 03:07:36 GMT

As I known, the CSEc key will be loaded in the format of M1, M2, M3, and the M4, M5 are used to check the result of key load. It is safe for that the calculation is irreversible, but I want to know that after loading the key to CSEc slot, whether the key is decrypted or still stored as the format of M1 to M5?

Re: CSEc key load result

lukaszadrapa — Thu, 23 Jun 2022 05:31:33 GMT

Hi,

it follows SHE specification:

Regards,

Lukas

Re: CSEc key load result

yqs77 — Mon, 04 Jul 2022 02:57:22 GMT

Thanks for the reply. Refer to the attachment, I will suppose that when the key like BOOT_MAC_KEY loaded to slot, it will be encrypted with the AES in ECB mode. And when it used like BOOT_MAC calculation, it is still read in AES encrypted form. Am I correct?

Re: CSEc key load result

lukaszadrapa — Mon, 11 Jul 2022 05:01:19 GMT

Hi,

I'm sorry for delayed response.

From user's point of view, this is completely hidden to user. A user can use the keys or BOOT_MAC as needed and knowledge of these background operations is not needed. It follows SHE specification to ensure the keys / BOOT_MAC are protected as required. We can't share more details.

Regards,

Lukas