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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `_04_features` mod in crate `rustls`."><meta name="keywords" content="rust, rustlang, rust-lang, _04_features"><title>rustls::manual::_04_features - Rust</title><link rel="stylesheet" type="text/css" href="../../../normalize.css"><link rel="stylesheet" type="text/css" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../../ayu.css" disabled ><script id="default-settings"></script><script src="../../../storage.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../../favicon.svg">
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<a id="settings-menu" href="../../../settings.html"><img src="../../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><span class="in-band">Module <a href="../../index.html">rustls</a>::<wbr><a href="../index.html">manual</a>::<wbr><a class="mod" href="">_04_features</a></span><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span><a class="srclink" href="../../../src/rustls/manual/features.rs.html#1-50" title="goto source code">[src]</a></span></h1><div class="docblock"><p>This section documents rustls itself: what protocol features are and are not implemented.</p>
<h2 id="current-features" class="section-header"><a href="#current-features">Current features</a></h2>
<ul>
<li>TLS1.2 and TLS1.3.</li>
<li>ECDSA, Ed25519 or RSA server authentication by clients.</li>
<li>ECDSA, Ed25519 or RSA server authentication by servers.</li>
<li>Forward secrecy using ECDHE; with curve25519, nistp256 or nistp384 curves.</li>
<li>AES128-GCM and AES256-GCM bulk encryption, with safe nonces.</li>
<li>ChaCha20-Poly1305 bulk encryption (<a href="https://tools.ietf.org/html/rfc7905">RFC7905</a>).</li>
<li>ALPN support.</li>
<li>SNI support.</li>
<li>Tunable MTU to make TLS messages match size of underlying transport.</li>
<li>Optional use of vectored IO to minimise system calls.</li>
<li>TLS1.2 session resumption.</li>
<li>TLS1.2 resumption via tickets (RFC5077).</li>
<li>TLS1.3 resumption via tickets or session storage.</li>
<li>TLS1.3 0-RTT data for clients.</li>
<li>Client authentication by clients.</li>
<li>Client authentication by servers.</li>
<li>Extended master secret support (RFC7627).</li>
<li>Exporters (RFC5705).</li>
<li>OCSP stapling by servers.</li>
<li>SCT stapling by servers.</li>
<li>SCT verification by clients.</li>
</ul>
<h2 id="possible-future-features" class="section-header"><a href="#possible-future-features">Possible future features</a></h2>
<ul>
<li>PSK support.</li>
<li>OCSP verification by clients.</li>
<li>Certificate pinning.</li>
</ul>
<h2 id="non-features" class="section-header"><a href="#non-features">Non-features</a></h2>
<p>For reasons explained in the other sections of this manual, rustls does not
and will not support:</p>
<ul>
<li>SSL1, SSL2, SSL3, TLS1 or TLS1.1.</li>
<li>RC4.</li>
<li>DES or triple DES.</li>
<li>EXPORT ciphersuites.</li>
<li>MAC-then-encrypt ciphersuites.</li>
<li>Ciphersuites without forward secrecy.</li>
<li>Renegotiation.</li>
<li>Kerberos.</li>
<li>Compression.</li>
<li>Discrete-log Diffie-Hellman.</li>
<li>Automatic protocol version downgrade.</li>
</ul>
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