This repository is part of the source code of Wire. You can find more information at wire.com or by contacting [email protected].

You can find the published source code at github.com/wireapp.

For licensing information, see the attached LICENSE file and the list of third-party licenses at wire.com/legal/licenses/.

JNI bindings for the cryptobox with support for cross-compilation to Android.

### Host Architecture

Besides common OS-specific development tooling, the following prerequisites are needed to build for the host architecture:

• A Rust compiler (1.12.1 or newer).
• A Java compiler (1.6 or later).

With that in place

make dist

will leave a tarball in the dist directory containing all the binaries for your host architecture in the form of shared libraries, as well as a .jar file and the corresponding javadoc output.

### Android

Besides common OS-specific development tooling, the following prerequisites are needed to build for Android:

• The Android SDK (The Android Studio IDE is not required).

• The Android NDK (r10d or newer).

• NDK standalone toolchains for the following architectures:

  • armeabi-v7a
  • arm64-v8a
  • x86

• A Java compiler (1.6 or later).

• A Rust compiler (1.12.1 or newer) that can cross-compile to the following targets corresponding to the aforementioned NDK standalone toolchains:

  • armv7-linux-androideabi
  • aarch64-linux-android
  • i686-linux-android

  It is recommended to use rustup to manage multiple Rust compiler toolchains. Using rustup, the following commands will install the necessary target-specific Rust binaries needed for Android:

  rustup target add armv7-linux-androideabi
  rustup target add i686-linux-android
  rustup target add aarch64-linux-android
  

  Alternatively a Rust compiler that supports the necessary targets can be built from source, e.g.:

  ./configure \
      --prefix=/where/to/install \
      --arm-linux-androideabi-ndk=/path/to/android-ndk-toolchain-armeabi-v7a \
      --aarch64-linux-android-ndk=/path/to/android-ndk-toolchain-arm64-v8a \
      --i686-linux-android-ndk=/path/to/android-ndk-toolchain-x86 \
      --target=arm-linux-androideabi,aarch64-linux-android,i686-linux-android
  make -j4
  make install
  

• The ANDROID_NDK_HOME environment variable must be set and point to the home directory of the NDK installation.

• The ANDROID_NDK_TOOLCHAIN_ARM environment variable must be set and point to the home directory of the armeabi-v7a standalone toolchain.

• The ANDROID_NDK_TOOLCHAIN_X86 environment variable must be set and point to the home directory of the x86 standalone toolchain.

• The ANDROID_NDK_TOOLCHAIN_AARCH64 environment variable must be set and point to the home directory of the arm64-v8a standalone toolchain.

With the prerequisites in place, the Android build can be run with:

cd android && make dist

The distribution artifacts will be in the android/dist directory, which includes an Android Library Archive (.aar).

You need:

• MSYS2 with MinGW-w64 toolchains

• The pkg-config from MinGW-w64 toolchain

  pacman -S mingw-w64-x86_64-pkg-config
  

• A Java compiler (1.6 or later)

• A Rust compiler (1.6 or newer) with GNU ABI

• The JAVA_HOME environment variable must be set correctly for MSYS2

  export JAVA_HOME="/c/Program Files/Java/jdk1.8.0_rev"
  

• The PATH environment variable must include JDK and Rust for MSYS2

This project has a simple Android sample application that can be installed on a connected Android device or emulator:

cd android-example && make install

Look for an application named CryptoBoxExample.

Currently this project's tests run only on Android and require a connected Android device or emulator:

cd android-example && make test

The test project is located in the android-example/tests directory.

For any problems, comments, or feedback please create an issue here on GitHub.

This project is released under the GNU General Public License v3.0.