TLSSecure

TLSSecure is an open-source software project that provides a comprehensive toolkit for implementing and hardening Transport Layer Security (TLS) in client and server applications. It includes a portable TLS library, a certificate validation and pinning module, and tooling for configuration, testing, and monitoring.

Core features include support for TLS 1.2 and TLS 1.3, explicit cipher suite policy, and robust certificate validation. The pinning module allows managed pin sets, while the toolkit supports OCSP stapling, certificate transparency integration, and logging for posture monitoring. A policy engine enables enforcement of minimum protocol versions and cipher strength.

The architecture emphasizes portability and embedding in diverse environments. The core library is written in C, with bindings for C, Go, and Rust, and is designed to run in servers, proxies, and client applications. It provides hooks for custom validation, error handling, and observability without requiring a full TLS stack replacement.

TLSSecure is maintained by an open-source community and released under an permissive license. Security reviews and audits are conducted periodically. The project adheres to established TLS standards and uses test vectors and automated checks; however, strict pinning or aggressive policy settings may affect compatibility with legacy clients.

Adoption has grown among API gateways, web services, and mail servers seeking stronger TLS postures. While pinning and lifecycle management can reduce downgrade risk, they also introduce operational complexity that requires careful configuration and verification.