Ledger wallets SDK for Rust Applications

Crate that allows developing Ledger Nano apps in Rust with a default configuration.

Contains:

• some safe wrappers over common syscalls
• IO abstractions
• signature abstractions

This SDK is incomplete in the sense that wrappers are currently missing, and not all wrappers have a nice Rust abstraction on top, but two apps were made using it:

• A demo application with a signature UI workflow
• A Password Manager

You can submit an issue or even a pull request if you wish to contribute, we will check what we can do.

Supported devices

Usage

Building requires adding rust-src to your Rust installation, and both Clang and arm-none-eabi-gcc. On Ubuntu, gcc-multilib might also be required.

Using rustc nightly builds is mandatory as some unstable features are required.

• rustup default nightly
• rustup component add rust-src
• install Clang.
• install an ARM gcc toolchain

If you wish to install the ARM gcc toolchain using your distribution's packages, these commands should work:

# On Debian and Ubuntu
sudo apt install clang gcc-arm-none-eabi gcc-multilib

# On Fedora or Red Hat Entreprise Linux
sudo dnf install clang arm-none-eabi-gcc arm-none-eabi-newlib

# On ArchLinux
sudo pacman -S clang arm-none-eabi-gcc arm-none-eabi-newlib

This SDK provides three custom target files for Nano S, Nano X and Nano S+.

Building for Nano S

cargo build --release -Z build-std=core --target=./nanos.json

Building for Nano X

cargo build --release -Z build-std=core --target=./nanox.json

Building for Nano S+

cargo build --release -Z build-std=core --target=./nanosplus.json

Building with rustc < 1.54

Building before rustc 1.54 should fail with error[E0635]: unknown feature const_fn_trait_bound.

This is solved by activating a specific feature: cargo build --features pre1_54

Contributing

Make sure you've followed the installation steps above. In order for your PR to be accepted, it will have to pass the CI, which performs the following checks:

• Check if the code builds on nightly
• Check that clippy does not emit any warnings
• check that your code follows rustfmt's format (using cargo fmt)