b0529bc943
This commit provides a method to verify that firmware has been signed with a private key given its public key. The implementation uses ed25519-dalek as the signature verifier. An "ed25519" feature is required to enable the functionality. When disabled (the default), calling the firmware updater's verify method will return a failure.
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Examples using bootloader
Example for nRF demonstrating the bootloader. The example consists of application binaries, 'a' which allows you to press a button to start the DFU process, and 'b' which is the updated application.
Prerequisites
cargo-binutilscargo-flashembassy-boot-nrf
Usage
# Use bare metal linker script
cp memory-bl.x ../../bootloader/nrf/memory.x
# Flash bootloader
cargo flash --manifest-path ../../bootloader/nrf/Cargo.toml --features embassy-nrf/nrf52840 --target thumbv7em-none-eabi --release --chip nRF52840_xxAA
# Build 'b'
cargo build --release --bin b --features embassy-nrf/nrf52840
# Generate binary for 'b'
cargo objcopy --release --bin b --features embassy-nrf/nrf52840 --target thumbv7em-none-eabi -- -O binary b.bin
Flash a (which includes b.bin)
cargo flash --release --bin a --features embassy-nrf/nrf52840 --target thumbv7em-none-eabi --chip nRF52840_xxAA
You should then see a solid LED. Pressing button 1 will cause the DFU to be loaded by the bootloader. Upon successfully loading, you'll see the LED flash. After 5 seconds, because there is no petting of the watchdog, you'll see the LED go solid again. This indicates that the bootloader has reverted the update.