s2n
A C99 TLS/SSL implementation designed for simplicity, small size, speed, and security-first design.
What is s2n?
s2n-tls is an open-source implementation of the TLS/SSL protocols written in C99. It provides secure communication for applications by encrypting data transmissions, with a design focused on simplicity, small code size, and high performance. The project prioritizes security through systematic mechanisms like memory protection, timing blinding, and auditable code.
Developers and organizations building networked applications in C or other languages via bindings, who need a lightweight, secure, and performant TLS/SSL library. It is particularly suitable for those requiring strict security controls and auditability.
Developers choose s2n-tls for its security-first design, minimal attack surface, and intuitive API. Its modular support for multiple cryptographic libraries, systematic safety mechanisms, and AWS backing make it a reliable choice for production systems where security and performance are critical.
Overview
An implementation of the TLS/SSL protocols
Use Cases
Best For
- Implementing TLS/SSL in C-based networked applications
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