rp235x-sha256

Hardware abstraction for the RP2350 (Raspberry Pi Pico 2) SHA256 feature

// Take the peripherals
let mut pac = hal::pac::Peripherals::take().unwrap();

// Initialise the SHA256 hardware
let mut sha = rp235x_sha256::Sha256::new(pac.SHA256, &mut pac.RESETS);

// Build a `Hasher`
let mut hasher = sha.start();

let data = b"abc";

// Update state of hasher
hasher.update(&data);

// Finalize and return 256-bit hash
let hash: [u32; 8] = hasher.finalize();

Crypto dongle example

Building

This requires a memory.x map for the target RP2350 core (eg RISC-V core memory map).

RUSTFLAGS="-C link-arg=--nmagic -C link-arg=-Tmemory.x" cargo build --target=riscv32imac-unknown-none-elf --example cryptodongle
picotool load -u -v -x -t elf target/riscv32imac-unknown-none-elf/debug/examples/cryptodongle

Running

Listen for serial communication from device:

stty -F /dev/ttyACM0 raw -echo -echoe -echok && cat /dev/ttyACM0

Send a message to the device to be hashed:

echo -n "abc" >> /dev/ttyACM0