app-ethereum

Ethereum wallet application for Ledger Blue, Nano S, Nano S Plus and Nano X
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Table of Contents

• About the project
• Documentation
  • Plugins
• Quick start guide
  • With VSCode
  • With a terminal
• Compilation and load
  • Compilation
  • Loading on a physical device
• Tests
  • Functional Tests (Ragger based)
  • Unit Tests
• Contributing

About the project

Ethereum wallet application framework for Nano S, Nano S Plus and Nano X. Ledger Blue is not maintained anymore, but the app can still be compiled for this target using the branch blue-final-release.

Documentation

This app follows the specification available in the doc/ folder.

To compile it and load it on a device, please check out our developer portal.

Plugins

We have the concept of plugins in the ETH app. Find the documentations here:

• Blog Ethereum plugins
• Ethereum application Plugins : Technical Specifications
• Plugin guide
• Boilerplate plugin

Quick start guide

With VSCode

You can quickly setup a convenient environment to build and test your application by using Ledger's VSCode developer tools extension which leverages the ledger-app-dev-tools docker image.

It will allow you, whether you are developing on macOS, Windows or Linux, to quickly build your apps, test them on Speculos and load them on any supported device.

• Install and run Docker.
• Make sure you have an X11 server running:
  • On Ubuntu Linux, it should be running by default.
  • On macOS, install and launch XQuartz (make sure to go to XQuartz > Preferences > Security and check "Allow client connections").
  • On Windows, install and launch VcXsrv (make sure to configure it to disable access control).
• Install VScode and add Ledger's extension.
• Open a terminal and clone app-ethereum with git clone git@github.com:LedgerHQ/app-ethereum.git.
• Open the app-ethereum folder with VSCode.
• Use Ledger extension's sidebar menu or open the tasks menu with ctrl + shift + b (command + shift + b on a Mac) to conveniently execute actions:
  • Build the app for the device model of your choice with Build.
  • Test your binary on Speculos with Run with Speculos.
  • You can also run functional tests, load the app on a physical device, and more.

The terminal tab of VSCode will show you what commands the extension runs behind the scene.

With a terminal

The ledger-app-dev-tools docker image contains all the required tools and libraries to build, test and load an application.

You can download it from the ghcr.io docker repository:

sudo docker pull ghcr.io/ledgerhq/ledger-app-builder/ledger-app-dev-tools:latest

You can then enter this development environment by executing the following command from the root directory of the application git repository:

Linux (Ubuntu)

sudo docker run --rm -ti --user "$(id -u):$(id -g)" --privileged -v "/dev/bus/usb:/dev/bus/usb" -v "$(realpath .):/app" ghcr.io/ledgerhq/ledger-app-builder/ledger-app-dev-tools:latest

macOS

sudo docker run  --rm -ti --user "$(id -u):$(id -g)" --privileged -v "$(pwd -P):/app" ghcr.io/ledgerhq/ledger-app-builder/ledger-app-dev-tools:latest

Windows (with PowerShell)

docker run --rm -ti --privileged -v "$(Get-Location):/app" ghcr.io/ledgerhq/ledger-app-builder/ledger-app-dev-tools:latest

The application's code will be available from inside the docker container, you can proceed to the following compilation steps to build your app.

Compilation and load

To easily setup a development environment for compilation and loading on a physical device, you can use the VSCode integration whether you are on Linux, macOS or Windows.

If you prefer using a terminal to perform the steps manually, you can use the guide below.

Compilation

Setup a compilation environment by following the shell with docker approach.

Be sure you checkout the submodule:

git submodule update --init

From inside the container, use the following command to build the app:

make DEBUG=1  # compile optionally with PRINTF

You can choose which device to compile and load for by setting the BOLOS_SDK environment variable to the following values:

• BOLOS_SDK=$NANOS_SDK
• BOLOS_SDK=$NANOX_SDK
• BOLOS_SDK=$NANOSP_SDK
• BOLOS_SDK=$STAX_SDK

Loading on a physical device

This step will vary slightly depending on your platform.

Your physical device must be connected, unlocked and the screen showing the dashboard (not inside an application).

Linux (Ubuntu)

First make sure you have the proper udev rules added on your host. See udev-rules

Then once you have opened a terminal in the app-builder image and built the app for the device you want, run the following command:

# Run this command from the app-builder container terminal.
make load    # load the app on a Nano S by default

Setting the BOLOS_SDK environment variable will allow you to load on whichever supported device you want.

macOS / Windows (with PowerShell)

It is assumed you have Python installed on your computer.

Run these commands on your host from the app's source folder once you have built the app for the device you want:

# Install Python virtualenv
python3 -m pip install virtualenv
# Create the 'ledger' virtualenv
python3 -m virtualenv ledger

Enter the Python virtual environment

• macOS: source ledger/bin/activate
• Windows: .\ledger\Scripts\Activate.ps1

# Install Ledgerblue (tool to load the app)
python3 -m pip install ledgerblue
# Load the app.
python3 -m ledgerblue.runScript --scp --fileName bin/app.apdu --elfFile bin/app.elf

Tests

The Ethereum app comes with different tests:

• Functional Tests implemented with Ledger's Ragger test framework.
• Unit Tests, allowing to test basic simple functions

Functional Tests (Ragger based)

Linux (Ubuntu)

On Linux, you can use Ledger's VS Code extension to run the tests. If you prefer not to, open a terminal and follow the steps below.

Install the tests requirements:

pip install -r tests/ragger/requirements.txt

Then you can:

Run the functional tests (here for nanos but available for any device once you have built the binaries):

pytest tests/ragger/ --tb=short -v --device nanos

Please see the corresponding ducomentation USAGE

Or run your app directly with Speculos

speculos --model nanos build/nanos/bin/app.elf

macOS / Windows

To test your app on macOS or Windows, it is recommended to use Ledger's VS Code extension to quickly setup a working test environment.

You can use the following sequence of tasks and commands (all accessible in the extension sidebar menu):

• Select build target
• Build app

Then you can choose to execute the functional tests:

• Use Run tests.

Or simply run the app on the Speculos emulator:

• Run with Speculos.

Unit Tests

Those tests are available in the directory tests/unit. Please see the corresponding README to compile and run them.

Contributing

Contributions are what makes the open source community such an amazing place to learn, inspire, and create. Any contributions you make are greatly appreciated.

If you have a suggestion that would make this better, please fork the repo and create a pull request. You can also simply open an issue with the tag enhancement.

1. Fork the Project
2. Create your Feature Branch (git checkout -b feature/my-feature)
3. Commit your Changes (git commit -m 'feat: my new feature)
4. Push to the Branch (git push origin feature/my-feature)
5. Open a Pull Request

Please try to follow Conventional Commits.