How can I call a secure service (like hash, cipher functions, ...) from non secure application via PSA API ?

[BKABR.1]

Hello,

I'm new to stm32 ecosystem and I'm trying to make in place secure boot and secure firmware update on stm32l5 discovery kit. After these two things, I would like to call secure services from non secure application via PSA API.

I first get the stm32cubel5 package expansion and after compilation, the secure boot seems to be OK. I still facing on how can I call a secure service (like hash, cipher functions, ...) from the non secure application ? I have read some documents on the PSA specification but I have not find any answer to my question.

I will be happy if someone have some documents or anything else that can help me to establish communication between non secure and secure application !

Regards.