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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="This section collects together goal-oriented documentation."><title>rustls::manual::_03_howto - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../../static.files/rustdoc-ac92e1bbe349e143.css"><meta name="rustdoc-vars" data-root-path="../../../" data-static-root-path="../../../static.files/" data-current-crate="rustls" data-themes="" data-resource-suffix="" data-rustdoc-version="1.76.0 (07dca489a 2024-02-04)" data-channel="1.76.0" data-search-js="search-2b6ce74ff89ae146.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../../static.files/storage-f2adc0d6ca4d09fb.js"></script><script defer src="../sidebar-items.js"></script><script defer src="../../../static.files/main-305769736d49e732.js"></script><noscript><link rel="stylesheet" href="../../../static.files/noscript-feafe1bb7466e4bd.css"></noscript><link rel="alternate icon" type="image/png" href="../../../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc mod"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">&#9776;</button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../../rustls/index.html">rustls</a><span class="version">0.21.7</span></h2></div><h2 class="location"><a href="#">Module _03_howto</a></h2><div class="sidebar-elems"><h2><a href="../index.html">In rustls::manual</a></h2></div></nav><div class="sidebar-resizer"></div>
<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../../../rustls/all.html" title="show sidebar"></a></div><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press S to search, ? for more options…" type="search"><div id="help-button" tabindex="-1"><a href="../../../help.html" title="help">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1>Module <a href="../../index.html">rustls</a>::<wbr><a href="../index.html">manual</a>::<wbr><a class="mod" href="#">_03_howto</a><button id="copy-path" title="Copy item path to clipboard"><img src="../../../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../../../src/rustls/manual/howto.rs.html#1-36">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>&#x2212;</span>]</button></span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>This section collects together goal-oriented documentation.</p>
<h2 id="customising-private-key-usage"><a href="#customising-private-key-usage">Customising private key usage</a></h2>
<p>By default rustls supports PKCS#8-format<sup id="fnref1"><a href="#fn1">1</a></sup> RSA or ECDSA keys, plus PKCS#1-format RSA keys.</p>
<p>However, if your private key resides in a HSM, or in another process, or perhaps
another machine, rustls has some extension points to support this:</p>
<p>The main trait you must implement is <a href="../../sign/trait.SigningKey.html"><code>sign::SigningKey</code></a>. The primary method here
is <a href="../../sign/trait.SigningKey.html#tymethod.choose_scheme"><code>choose_scheme</code></a> where you are given a set of <a href="../../enum.SignatureScheme.html"><code>SignatureScheme</code>s</a> the client says
it supports: you must choose one (or return <code>None</code> this aborts the handshake). Having
done that, you return an implementation of the <a href="../../sign/trait.Signer.html"><code>sign::Signer</code></a> trait.
The <a href="../../sign/trait.Signer.html#tymethod.sign"><code>sign()</code></a> performs the signature and returns it.</p>
<p>(Unfortunately this is currently designed for keys with low latency access, like in a
PKCS#11 provider, Microsoft CryptoAPI, etc. so is blocking rather than asynchronous.
Its a TODO to make these and other extension points async.)</p>
<p>Once you have these two pieces, configuring a server to use them involves, briefly:</p>
<ul>
<li>packaging your <code>sign::SigningKey</code> with the matching certificate chain into a <a href="../../sign/struct.CertifiedKey.html"><code>sign::CertifiedKey</code></a></li>
<li>making a <a href="../../struct.ResolvesServerCertUsingSni.html"><code>ResolvesServerCertUsingSni</code></a> and feeding in your <code>sign::CertifiedKey</code> for all SNI hostnames you want to use it for,</li>
<li>setting that as your <code>ServerConfig</code>s <a href="../../struct.ServerConfig.html#structfield.cert_resolver"><code>cert_resolver</code></a></li>
</ul>
<div class="footnotes"><hr><ol><li id="fn1"><p>For PKCS#8 it does not support password encryption theres not a meaningful threat
model addressed by this, and the encryption supported is typically extremely poor.&nbsp;<a href="#fnref1"></a></p></li></ol></div></div></details></section></div></main></body></html>