aws/s2n-tls
FreeAn implementation of the TLS/SSL protocols
FreeFree tier
About aws/s2n-tls
s2n-tls is a C99 implementation of the TLS/SSL protocols developed by AWS, designed to be simple, small, fast, and with security as a priority. Released under the Apache License 2.0, it supports multiple platforms including Ubuntu, Amazon Linux, NixOS, OpenBSD, FreeBSD, macOS, and Windows (via MSYS2/MinGW). The library includes Doxygen-based documentation, a usage guide, and Rust bindings. It is continuously tested on Tier 1 and Tier 2 platforms. The name 's2n-tls' is short for 'signal to noise', reflecting the encryption process.
Key Features
C99 implementation of TLS/SSL protocols
Simple, small, and fast design
Security as a priority
Apache License 2.0 open source
Cross-platform support: Ubuntu, Amazon Linux, NixOS, OpenBSD, FreeBSD, macOS, Windows (MSYS2/MinGW)
Comprehensive Doxygen documentation and usage guide
Rust bindings available
Continuous integration testing on Tier 1 and Tier 2 platforms
Pros & Cons
Pros
- Open source with permissive Apache 2.0 license
- Security-focused design
- Well-documented API and usage guide
- Cross-platform and portable (C99)
- Backed by AWS with active maintenance
Cons
- Requires an external libcrypto library (e.g., OpenSSL) as a build dependency
- Limited to C99; other languages require bindings
Best For
Embedding TLS/SSL in software applicationsSecure network communicationBuilding secure cloud infrastructureIntegration into operating systems or embedded systems