LITE Flow tool
This project is an attempt at a reference implementation of the cryptographic "flow" demonstrating how data undergoes encryption and signing from an embedded device to the cloud.
In order to gather some meaningful benchmarks, there is also a main program that is able to run on some embedded targets to benchmark this encryption.
Submodules
This repo currently brings in a current version of embassy with git submodules,
and if you didn't add --submodules when cloning the repo, you will need to
update those:
$ git submodule update --init
On target benchmarking
Currently, the benchmark can be run on the STM32F407VGTx Discovery board, which is available at the time of writing. This tool needs a rust unstable version, which can be downloaded with rustup. It is highly recommended to use rustup to build this software, as the necessary tools will be automatically installed.
$ cd boards/stm32f4-disco
$ cargo build --release
Although the rust embedded book describes using openocd to connect to the
target, the probe-run tool, built on probe-rs provides a much more concise
solution to running and developing on these boards. It supports the RTT
protocol, and will automatically show available messages as they are printed by
the device.
$ cargo install probe-run
You should be able to query your probe with:
$ probe-run --list-probes
the following probes were found:
[0]: STLink V3 (VID: 0483, PID: 374e, Serial: 001F00094741500420383733, StLink)
If the board doesn't show up here, it likely has to do with device permissions and such. The probe-run documentation may be helpful in diagnosing problems.
Once that works, you can just issue
$ cargo run --release
to run the test, and print out messages. There is a script ./run.sh in this
directory that uses a grep command to filter out the line information on the log
messages, making the content of the messages easier to read.