A Messaging Layer Security (MLS) library for Android, built with Rust and Kotlin using OpenMLS.

• End-to-end encrypted group messaging
• Built on the MLS protocol (RFC 9420)
• Native performance with Rust backend
• Simple Kotlin API for Android

Add to your build.gradle.kts:

dependencies {
    implementation("space.zeroxv6:kotlin-mls:1.1.0")
}

import space.zeroxv6.kotlin_mls.MlsService

// Initialize
val mlsService = MlsService(context)

// Create a group
val groupId = mlsService.createGroup()

// Generate key package
val keyPackage = mlsService.generateKeyPackage()

// Add member
mlsService.addMember(groupId, keyPackage)

// Send encrypted message
val ciphertext = mlsService.sendMessage(groupId, "Hello, MLS!")

// Receive and decrypt
val plaintext = mlsService.receiveMessage(groupId, ciphertext)

• Android API 26+
• NDK 29.0.14206865

# Build the library
./gradlew :app:assembleRelease

# Run tests
./gradlew :app:test
./gradlew :app:connectedAndroidTest

• Rust Layer: Core MLS implementation using OpenMLS
• UniFFI: Automatic Kotlin bindings generation
• Android Library: Kotlin wrapper with Android-friendly API

This library has not undergone a formal security audit. While care has been taken to implement the MLS protocol correctly and securely, it may contain undiscovered vulnerabilities. If you plan to use this library in a production or security-critical context, proceed with caution and consider conducting an independent security review.

MIT License - see LICENSE file for details.

Contributions are welcome! Please feel free to submit a Pull Request.

Raman Mann (aka zeroxv6)

• GitHub: @zeroxv6
• Email: raman.mann.205@gmail.com