s2n
An implementation of the TLS/SSL protocols
... implements SSLv3, TLS1.0, TLS1.1, TLS1.2, and TLS1.3. For encryption, s2n-tls supports 128-bit and 256-bit AES in the CBC and GCM modes, ChaCha20, 3DES, and RC4. For forward secrecy, s2n-tls supports both DHE and ECDHE. s2n-tls also supports the Server Name Indicator (SNI), Application-Layer Protocol Negotiation (ALPN), and Online Certificate Status Protocol (OCSP) TLS extensions. SSLv3, RC4, 3DES, and DHE are each disabled by default for security reasons.