Wire CoreCrypto

This repository is part of the source code of Wire. You can find more information at wire.com or by contacting opensource@wire.com.

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

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

No license is granted to the Wire trademark and its associated logos, all of which will continue to be owned exclusively by Wire Swiss GmbH. Any use of the Wire trademark and/or its associated logos is expressly prohibited without the express prior written consent of Wire Swiss GmbH.

Parts

• CoreCrypto: Abstracts MLS & Proteus in a unified API
• CoreCryptoFFI: FFI bindings for iOS, Android and WASM
• Keystore: Encrypted Keystore powered by SQLCipher on all platforms except WASM. WASM uses an IndexedDB-backed, encrypted store with AES256-GCM
• MlsProvider: RustCrypto + Keystore MLS provider

See ARCHITECTURE.md

Usage

API Docs

Building

General Requirements

• rust: https://www.rust-lang.org/tools/install
• cargo-make: https://sagiegurari.github.io/cargo-make/

If you're using macOS, you'll also need to install GNU sed:

brew install gnu-sed

and add an alias to your shell configuration file: alias sed=gsed (e.g. to ~/.zshenv if you're using zsh).

Development Requirements

Pre-commit

• Install the pre-commit framework
• Run pre-commit install to initialize the pre-commit hooks

Android

Install Android SDK and Build-Tools for API level 30+

Important

If you are building on macOS you'll need to setup $ANDROID_SDK_ROOT path variable manually:

export ANDROID_SDK_ROOT=~/Android/Sdk

Install android rust targets:

rustup target add x86_64-linux-android aarch64-linux-android armv7-linux-androideabi

Build:

cd crypto-ffi
cargo make android
cd bindings
./gradlew android:build

iOS

Install Xcode & its command-line tools: https://developer.apple.com/xcode/.

Install iOS rust targets:

rustup target add aarch64-apple-ios x86_64-apple-ios aarch64-apple-ios-sim

Build:

cd crypto-ffi
cargo make ios
# Additionally, if you want to export a .XCFramework:
cargo make ios-create-xcframework

MacOS

Install macOS rust targets:

rustup target add x86_64-apple-darwin aarch64-apple-darwin

Linux

Note

If cross-compiling from macOS, you'll need to install https://github.com/messense/homebrew-macos-cross-toolchains.

Install Linux targets:

rustup target add x86_64-unknown-linux-gnu

WASM

Make sure you have all prerequisites:

• Install wasm-pack
• Install the wasm32-unknown-unknown toolchain: rustup target add wasm32-unknown-unknown
• Install node.js (recommended way is via Volta)
• Install Bun (follow the instructions on Bun's website)

Build:

cd crypto-ffi
cargo make wasm

Bindings

Build bindings for Android, JVM, iOS and WASM

cd crypto-ffi

# builds bindings and targets for the JVM (macOS / Linux)
cargo make jvm

# builds bindings and targets for Android
cargo make android

# builds iOS framework
cargo make ios-create-xcframework

# builds wasm binary & TS bindings
cargo make wasm

Testing

General testing

# Install cargo-nextest if you haven't done so, it yields some substantial speedup
cargo install cargo-nextest
cargo nextest run

Run core crypto tests on WASM target

If you haven't already, install the target and wasm-pack:

rustup target add wasm32-unknown-unknown
cargo install wasm-pack

If you want to test for chrome, get chromedriver or the webdriver for the browser you want to test for, respectively.

Then, to run tests for a crate in the workspace do

wasm-pack test --headless --chrome ./<crate-folder-to-test>

Addendum: testing all ciphersuites

Warning

This takes quite a while.

cargo nextest run --features test-all-cipher

Platform-specific testing

Kotlin/Android

• Take the steps to compile for Kotlin/Android
• Then:

cd crypto-ffi/bindings
./gradlew test

Swift/iOS

No E2E testing is available as of now on Swift.

WASM/Web

• Take the steps to compile for WASM/Web
• Then:

cd crypto-ffi
bun test

Benchmarks

There are benches implemented in crypto/benches for several operations on mls groups with varying sizes or proteus. Parameters like minimum or maximum group sizes and step sizes are defined in crypto/benches/utils/mod.rs.

Executing Benches

To execute the benches, e.g. for creating commits, run

cargo bench --bench=commit -- --quick

where commit is the name of the bench specified in crypto/Cargo.toml, and the corresponding file in crypto/benches. In case you're interested in higher accuracy, and willing to trade it for execution speed, omit the --quick flag. If you need reporting plots, remove the .without_plots() call in crypto/benches/utils/mod.rs. The reports generated by criterion will be located in target/criterion.

Git workflow

• The main branch is used as the everyday development branch.
• No merge commits. Always rebase on top of main.
• Release branches are named release/<series>, e.g. release/1.x, release/2.x.
• Release branches contain fixes relevant to their specific release series and are never merged to main.
• Release branches always branch off their first major release tag. For example, the output of git merge-base main release/2.x must be a commit pointed to by tag v2.0.0.
• Release branches are created lazily, that is, only when the first fix needs to be applied and released for a specific release series.
• Use conventional commits -- those are picked up by the changelog generator.
• If there is a JIRA ticket related to the change, you should mention it in either the PR title or the commit(s), with the following format: [TICKET_ID].
• Sign your commits and tags.
• Remove branches from the remote once you don't need them anymore.

Publishing

Versioning

The versioning scheme used is SemVer AKA Semantic Versioning.

Making a new release

1. Make a branch based on main to prepare for release (git checkout -b prepare-release/X.Y.Z)
2. Run sh scripts/update-versions.sh X.Y.Z to update the versions of
   • all workspace member crates
   • package.json
   • crypto-ffi/bindings/gradle.properties Make sure the result of the script run is correct.
3. Generate the relevant changelog section:

   git cliff --bump --unreleased

   and add it to the top of CHANGELOG.md. Make sure the version number generated by git cliff matches the release version.
4. If there are any release highlights, add them as the first subsection below release title:

   ## v1.0.2 - 2024-08-16
   
   ### Highlights
   
   - foo
   - bar
   - baz

5. Make sure the changes look reasonable and complete; you can use the previous release as a reference
6. Push your prepare-release/X.Y.Z branch and create a PR for it
7. Get it reviewed, then merge it into main and remove the prepare-release/X.Y.Z branch from the remote
8. Now, pull your local main: git checkout main && git pull
9. Create the release tag: git tag -s vX.Y.Z
10. Push the new tag: git push origin tag vX.Y.Z
11. Create a new release on github, copying the relevant section from CHANGELOG.md
12. Voilà!

Publishing Android / JVM bindings

Publishing Android / JVM bindings happens automatically by a github workflow when a release tag is pushed.

If you would like to publish the bindings to a local maven cache, run:

cd crypto-ffi/bindings/android
./gradlew :jvm:publishToMavenLocal
./gradlew :android:publishToMavenLocal

Publishing JS / WASM bindings

Publishing JS / WASM bindings happens automatically by a github workflow when a release tag is pushed.

If you would like to publish to @wireapp/core-crypto manually, log into NPM and just run npm publish.