openmls/openmls

Some data may be outdated — see provenance labels.

Rust implementation of the Messaging Layer Security (MLS) protocol observed · 2026-09-24

github.com/openmls/openmls · homepage · Rust · MIT (permissive) observed · 2026-09-24

Health v2 · maintenance only

95/100

Activity 96
Release rhythm 92
Longevity 100

How is this computed?

round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-10-21. Adoption (stars, forks) is never an input.

gap_med: 16
age_days: 2348
days_rel: 56
days_push: 27
n_releases_24m: 8

Full methodology

Adoption not part of the score

1032 stars · 181 forks observed · 2026-09-24

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

OpenMLS is a Rust implementation of the Messaging Layer Security (MLS) protocol as specified in RFC 9420. It is a library providing safe, easy-to-use end-to-end encryption for group messaging, with pluggable cryptographic backends and support for targets including Linux, Windows, macOS, Android, iOS, and WebAssembly.

Use cases

add end-to-end encrypted group messaging to an app
implement the MLS protocol (RFC 9420) in Rust
encrypt messages for groups of two to many participants
build a secure messaging library with pluggable crypto backends
compile E2EE messaging code to WebAssembly or mobile platforms
resolve group state forks in MLS-based messaging

When to choose

you need a standards-compliant MLS (RFC 9420) implementation
you want safe, memory-safe Rust code for E2EE group messaging
you need cross-platform support including mobile and WASM
you want to bring your own cryptographic provider via traits

When to avoid

you need a complete messaging application rather than a protocol library
you need a non-Rust language implementation without FFI/wasm compilation
you require cryptographic primitives implemented in the library itself (it delegates to external providers)

Facets

library · maturity active

cryptography security sdk security privacy windows wasm rust cross-platform mls rfc9420 e2ee end-to-end-encryption group-messaging ietf messaging-layer-security messaging linux macos android ios

3 sources

readme: https://github.com/openmls/openmls · fetched 2026-09-24 · 437e5f707023
homepage: https://openmls.tech · fetched 2026-08-29 · e9cc78791c5f
registry_crates: https://crates.io/api/v1/crates/openmls · fetched 2026-08-29 · b764d4ef43c9

Member repositories

Repository	Role	Health v2
openmls/openmls	main	95

For agents

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Data as of 2026-10-19T08:05:51.212177+00:00 · Report a problem