Building the zephyr-wireguard requires a proper Zephyr development environment. Follow the official Zephyr Getting Started Guide to establish one. You need Zephyr version (4.1.99+), specifically from commit 8e908176c773980a61a44f861941228dc91c3329 ("net: shell: iface: Print VPN public key") or later.

Note that zephyr-wireguard is a library so normally you would want to use it in your own application. The zephyr-wireguard repository is a Zephyr module which allows for reuse of its components outside of the zephyr-wireguard demo application.

To pull in zephyr-wireguard as a Zephyr module, either add it as a West project in the west.yaml file or pull it in by adding a submanifest (e.g. zephyr/submanifests/zephyr-wireguard.yaml) file with the following content and run west update wireguard:

manifest:
  projects:
    - name: wireguard
      url: https://github.com/jukkar/zephyr-wireguard.git
      revision: main
      path: modules/lib/zephyr-wireguard # adjust the path as needed

You can also copy the file from this directory:

cp zephyr-wireguard.yaml $ZEPHYR_BASE/submanifests/

The zephyr-wireguard demo application can be used to show Wireguard functionality and how to setup the connection. The demo uses native_sim board, you can use the net-tools project, which is part of Zephyr development environment, to setup the host side:

cd $ZEPHYR_BASE/../tools/net-tools
./net-setup.sh -c wireguard-vpn.conf

The Zephyr Wireguard demo application can be built and run like this:

cd $ZEPHYR_BASE/../modules/lib/zephyr-wireguard
west build -p -b native_sim -d ../build samples/net/wireguard/ -- -DCONFIG_NATIVE_UART_AUTOATTACH_DEFAULT_CMD="\"gnome-terminal -- screen %s\""
../build/zephyr/zephyr.exe -attach_uart