STM32 MCUs Security

STM32 RDP2 prevents the modification of OPTLOCK?

Hi everyone,we have a bootloader that writes new application code to the flash bank 2 in an STM32H7 and afterwards swaps the banks to execute the new code. The procedure for swapping is something like this:   unlock OPTLOCK   set SWAP_BANK_OPT   set ...

can I use the Nucleo L053R8 CRC calculation unit to calculate a 3 Bytes length CRC value ? If it is possible how can I do it

STM32L arm based MCU - TRNG details

Hi, I am wondering if the build-in TRNG modules in the STM32L series (0, 1,2 ,4, 4+ and 5) are compliant with the NIST 800 90A/B/C standards. If so, where I can find information on ST stating such TRNG complies with this standards? We are developing ...

What is the best way to sign a message using RSA protocol ?

Hello, what wouldd be the best library to create private/public keys (RSA) and sign some messages ? I did not find a free library able to create and sign messages even in the smt32 crypto lib. Any clues ? Thank you in advance

Cryptographic scheme selection

Could someone elaborate on the tradeoffs of cryptographic scheme selection, especially between Asymmetric with AES encryption and Symmetric (AES GCM) ?While it is the default choice, it is not clear to me why SECBOOT_ECCDSA_WITH_AES128_CBC_SHA256 wou...

How to integrate the secure boot expansion package into CubeMX

I have the secure boot expansion package and I can't find any documentation at all that details how it integrates into CubeMX and how to install it. This is the expansion package:https://www.st.com/en/embedded-software/x-cube-sbsfu.htmlThanks in ad...

Which Serial Terminal is recommended for project SBSFU on MAC and Linux?

Hi,We were able to successfully port STM secure bootloader(SBSFU) on our custom boards. We could demo the firmware update using Teraterm(also extraputty) on windows machine as recommended by STM. But I was not able to update firmware using any of the...