mbedtls implements the SSL3, TLS 1.0, 1.1 and 1.2 protocols. It
supports a number of extensions such as SSL Session Tickets (RFC
5077), Server Name Indication (SNI) (RFC 6066), Truncated HMAC (RFC
6066), Max Fragment Length (RFC 6066), Secure Renegotiation (RFC
5746) and Application Layer Protocol Negotiation (ALPN). It
understands the RSA, (EC)DH(E)-RSA, (EC)DH(E)-PSK and RSA-PSK key
exchanges.