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1. Debug Authentication
Debug authentication controls debug opening and regressions. It can be used during development, manufacturing and for field return analysis.
- Features
- the usage of a password method allow only full regression (from closed state to open state).
- the usage of cryptography (certificates) can be used for full regressions ,debug opening and firmware update from a closed device.
- Debug authentication principle
- Use of JTAG dedicated access point (ap0) to communicate with the chip.
- Secure protocol defined by ARM : ARM PSA ADAC V1.0. (Authenticated Debug Access Control)[1]
2. Debug Authentication for STM32H7S with password method
Provisioning with password management
- Provisioning data is located at beginning of the OBKeys-HDPL1 area.
- Provisioning data is the HASH (SHA256) of the password.
- STM32TrustedPackageCreator is used to generate the OBKeys files containing the HASH of the Debug authentication password adding SHA256 to ensure integrity.
Debug authentication controls
- Full regression with the Debug authentication password.
- Debug authentication password has to be provisioned in OBKeys to allow this regression.
Getting started with Debug authentication
Refer to the following page for an example on getting started with Debug authentication access whith password method:
How to start with OEMiRoT - Password method
How to start with STiRoT - Password method
3. Debug Authentication for STM32H7S with certificate method