STM32 Hash Peripheral

[mbanducci-sandc]

Hi all,

I'm working on a system based on an STM32H755 and I'm having some trouble getting the HASH peripheral going. I did some digging, and it appears that Zephyr combines ciphers and hashes under the crypto driver, but ST splits the two into unique peripherals. I did find ST HAL code for the HASH peripheral, but it doesn't appear to make it into crypto_stm32.c.

Is there a piece I'm missing with regard to the STM32 HASH driver, or is this something that could use work to bring it to full functionality?

Thank you!
Mike

[ajarmouni-st]

Hi, crypto_stm32.c does not yet implement Zephyr's crypto_driver_api Hash functions (hash_begin_session, hash_free_session, hash_async_callback_set). So for now you will have to either use STM32 HAL directly or implement the Hash functions in crypto_stm32.c (an example of a driver that implements them: drivers/crypto/crypto_intel_sha.c) & then use Zephyr Crypto API.

[mbanducci-sandc]

Understood, thank you!