libolm ☆

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Description:
Implementation of the Double Ratchet cryptographic ratchet

Type: Formula | Tracked Since: Dec 28, 2025

Links: Homepage | @matrixorg | formulae.brew.sh

Category: Security

Tags: cryptography encryption matrix security messaging olm

Install: brew install libolm

About:
Libolm is an implementation of the Double Ratchet cryptographic ratchet used in end-to-end encrypted messaging. It provides Olm and Megolm encryption algorithms, enabling secure message exchange with forward secrecy and break-in recovery. This C library with Python bindings is essential for building Matrix clients that require verifiable end-to-end encryption.

Key Features:

Implements Olm and Megolm cryptographic ratchets
Provides forward secrecy and break-in recovery
C library with Python bindings for easy integration
Cryptographically verifiable encryption algorithms
Cross-platform compatibility

Use Cases:

Implementing end-to-end encryption in Matrix clients
Building secure messaging applications
Integrating Double Ratchet protocol into custom applications
Developing encrypted communication protocols

Alternatives:

libsignal-protocol – Signal's protocol implementation; Libolm is specifically designed for Matrix protocol compatibility

Version History

Detected	Version	Rev	Change	Commit
Sep 14, 2024 9:02pm		0	VERSION_BUMP	cf0ca189
May 1, 2023 12:53pm		0	VERSION_BUMP	8bcb6076