Hello ,
I am trying to calculate a MAC using `cmox_mac_compute()` from this lib on an STM32L562 in the Secure code.
The code looks like this :
auto r = cmox_initialize(NULL); /*default template with stm32l5xx.h included*/
auto ret = cmox_mac_compute(CMOX_CMAC_AES_ALGO,
in, in_s,
key, 16,
NULL, 0,
out, 16, NULL);
This exact code works when run on non secure mode if everything is set as non secure in stm32CubeMX.
I tried to debug the library to understand what was wrong and found out that the issue comes from the fact that cmox_mac_compute tries to access my crc peripheral from 0x40023000 instead of 0x50023000 (CRC non secure and secure addresses).
I am also almost sure that my GTZ and SAU are correctly set because i was able to write at address 0x50023000 and not at 0x40023000 when running from Secure code.
I also have :
CRC_BASE_S => 0x50023000
CRC_BASE_NS => 0x40023000
CRC_BASE => 0x50023000
So this looks fine. I also tried to forcefuly set CRC_BASE_NS to 0x50023000 but the cmac calculation was wrong again (still the same as when it doesn't work).
Because of these reasons , i guess that CMSIS isn't using CRC_BASE but an instance or something not directly linked to CRC_BASE.
I suppose that has to be done in 'cmox_initialize' or something similar but couldn't find anything to set the address or the mode to 'Secure execution context' so the library accesses the CRC through its secure address.
Also , i am effectively compiling the secure version in the secure elf and the same goes for non secure.
Can anyone help reguarding this matter ?
