Module rustls::manual::_04_features

This section documents rustls itself: what protocol features are and are not implemented.

Current features

• TLS1.2 and TLS1.3.
• ECDSA, Ed25519 or RSA server authentication by clients.
• ECDSA, Ed25519 or RSA server authentication by servers.
• Forward secrecy using ECDHE; with curve25519, nistp256 or nistp384 curves.
• AES128-GCM and AES256-GCM bulk encryption, with safe nonces.
• ChaCha20-Poly1305 bulk encryption (RFC7905).
• ALPN support.
• SNI support.
• Tunable MTU to make TLS messages match size of underlying transport.
• Optional use of vectored IO to minimise system calls.
• TLS1.2 session resumption.
• TLS1.2 resumption via tickets (RFC5077).
• TLS1.3 resumption via tickets or session storage.
• TLS1.3 0-RTT data for clients.
• Client authentication by clients.
• Client authentication by servers.
• Extended master secret support (RFC7627).
• Exporters (RFC5705).
• OCSP stapling by servers.
• SCT stapling by servers.
• SCT verification by clients.

Possible future features

• PSK support.
• OCSP verification by clients.
• Certificate pinning.

Non-features

For reasons explained in the other sections of this manual, rustls does not and will not support:

• SSL1, SSL2, SSL3, TLS1 or TLS1.1.
• RC4.
• DES or triple DES.
• EXPORT ciphersuites.
• MAC-then-encrypt ciphersuites.
• Ciphersuites without forward secrecy.
• Renegotiation.
• Kerberos.
• Compression.
• Discrete-log Diffie-Hellman.
• Automatic protocol version downgrade.