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Below is a list of implementations of TLS 1.3.


name language role(s) version features/limitations
fizz C++ C/S RFC 8446 Based on libsodium, includes secure design abstractions. Zero-copy for advanced performance.
NSS C C/S RFC 8446 Almost everything, except post-handshake auth and X448
Mint Go C/S -18 PSK resumption, 0-RTT, HRR
nqsb OCaml C/S -11 PSK/DHE-PSK, no EC*, no client auth, no 0RTT -- live server at port 4433, records traces, ping @hannesm, contains a static PSK/DHE_PSK token: id: 0x0000
secret: 0x000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f
ProtoTLS JavaScript C/S -13 EC/DHE/PSK, no HelloRetryRequest
miTLS F* C/S RFC 8446 EC/DHE/PSK/0-RTT, no RSA-PSS, no post-HS-auth, no ESNI
Tris Go C/S RFC 8446 ECDHE/PSK/0-RTT, no HelloRetryRequest
BoringSSL C C/S -23, -28, RFC 8446 P-256, X25519, HelloRetryRequest, resumption, 0-RTT, KeyUpdate
Wireshark C other -18 to -28, RFC 8446 Full decryption and dissection support for drafts 19-21 since 2.4.0 (keylog format). Supports 18-21 since 2.4.2, -22 since 2.4.3, -23 since 2.4.5, -24 to -28 (+0RTT trial decryption) since 2.6.0. Tracking bug.
picotls C C/S -18,-21,-23,-26 P-256, X25519, HelloRetryRequest, resumption, 0-RTT
rustls Rust C/S -28 (final on branch) P-256/P-384/curve25519, HRR, resumption, 0-RTT client
Haskell tls Haskell C/S -28 ECDHE w/ P* and X*, full, HRR, PSK, 0RTT
Leto C# S -18 DHE, X25519, AES, no PSK no 0RTT. Tested against NSS
OpenSSL C C/S RFC 8446 P-256, P-384, P-521, X25519, X448, Ed25519, Ed448, HelloRetryRequest, resumption, PSK, 0-RTT, CCS, cookies, stateless server, Post-handshake auth, KeyUpdate, RSA-PSS certs, no FFDHE
wolfSSL C C/S RFC 8446 -18/-22/-23/-26/-28 P-256, P-384, X25519, Ed25519, HelloRetryRequest, resumption, PSK, 0-RTT, CCS, cookies, stateless server, Post-Handshake Auth, KeyUpdate
GnuTLS C C/S RFC 8446 P-256, P-384, X25519, FFDHE, RSA-PSS (keys and certs), HelloRetryRequest, KeyUpdate, Post-Handshake Auth, PSK
tlslite-ng Python C/S RFC 8446 ECDHE (all), EdDHE (X25519, X448), FFDHE (all), AES-GCM, Chacha20, HelloRetryRequest, RSA, RSA-PSS keys and certificate signatures, cookie extension, CCS, PSK, resumption, in-handshake client auth, no ECDSA certificates, no post-handshake client auth, no 0-RTT, no KeyUpdate
tlsfuzzer Python C (other) RFC 8446 ECDHE (all), EdDHE (x25519, X448), FFDHE (all), AES-GCM, Chacha20, RSA, HelloRetryRequest, CCS, cookie extension, PSK, resumption, in-handshake auth, no KeyUpdate
SwiftTLS Swift C/S -26,-28, RFC 8446 ECDHE, P-256, 0-RTT, HelloRetryRequest
JSSE/JDK Java C/S RFC 8446 JDK 11 only: All required extensions and algorithms, ECDHE (all), FFDHE, RSA-PSS certs/signatures, PSK resumption, HelloRetryRequest, cookie extension, post handshake messages (NewSessionTicket/KeyUpdate), OCSP Stapling, Middlebox compatibility mode. No support for: previous drafts, 0-RTT, CCM, x25519/x448 & ChaCha20/Poly1305 (although JCA/JCE support is now available in JDK 11), SCT, post_handshake_auth.
CycloneSSL C C/S RFC 8446 P-256, P-384, X25519, X448, FFDHE, AES-GCM, AES-CCM, ChaCha20Poly1305, HelloRetryRequest, PSK, 0-RTT (client only), CCS, cookies, KeyUpdate, RSA-PSS certificates, ECDSA certificates, EdDSA certificates (Ed25519 and Ed448)

Version Negotiation

As of draft-16 version negotiation is in the "supported_versions" extension. Versions should advertise a draft version of TLS 1.3 as {0x7f, <version-number>} (for draft-16: {0x7f, 10}).



Available in all versions. TLS 1.3 is enabled by default from Firefox 60 (draft 23) on. Firefox 61 will support the final draft 28. On earlier versions, TLS 1.3 is disabled by default on the Release channel (set security.tls.version.max to 4 in about:config to enable it).


Need Chrome Version 57, uses BoringSSL (draft -18). Chrome 65 has implemented draft-22 and draft-23. Chromium 70 supports draft-23, draft-28 and final.

Go to chrome://flags/#tls13-variant and set the TLS 1.3 variant to Enabled (Final) (observed in Chromium 70).


Need macOS High Sierra or iOS 11. draft -18

On macOS, execute: defaults write /Library/Preferences/ tcp_connect_enable_tls13 1 On iOS, install the following profile:

Test servers

Implementation Version URL
BoringSSL+nginx -28
mod_nss -28
BoringSSL -23, -28, RFC8446
rustls+nginx RFC8446
picotls+H2O -18
Haskell tls -28
OpenSSL -18
OpenSSL -22
OpenSSL+nginx -26
OpenSSL+nginx RFC8446
SwiftTLS -26,-28, RFC8446
Tris+Caddy RFC 8446
OpenSSL -23
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