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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="Bindings to OpenSSL"><meta name="keywords" content="rust, rustlang, rust-lang, openssl"><title>openssl - 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">
<link rel="alternate icon" type="image/png" href="../favicon-16x16.png">
<link rel="alternate icon" type="image/png" href="../favicon-32x32.png"><style type="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><body class="rustdoc mod"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">&#9776;</div><a href='../openssl/index.html'><div class='logo-container rust-logo'><img src='../rust-logo.png' alt='logo'></div></a><p class="location">Crate openssl</p><div class="block version"><p>Version 0.10.32</p></div><div class="sidebar-elems"><a id="all-types" href="all.html"><p>See all openssl's items</p></a><div class="block items"><ul><li><a href="#modules">Modules</a></li><li><a href="#functions">Functions</a></li></ul></div><p class="location"></p><div id="sidebar-vars" data-name="openssl" data-ty="mod" data-relpath="../"></div></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu"><img src="../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><script src="../theme.js"></script><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" class="help-button">?</button>
<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">Crate <a class="mod" href="">openssl</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/openssl/lib.rs.html#1-202" title="goto source code">[src]</a></span></h1><div class="docblock"><p>Bindings to OpenSSL</p>
<p>This crate provides a safe interface to the popular OpenSSL cryptography library. OpenSSL versions 1.0.1 through
1.1.1 and LibreSSL versions 2.5 through 2.8 are supported.</p>
<h1 id="building" class="section-header"><a href="#building">Building</a></h1>
<p>Both OpenSSL libraries and headers are required to build this crate. There are multiple options available to locate
OpenSSL.</p>
<h2 id="vendored" class="section-header"><a href="#vendored">Vendored</a></h2>
<p>If the <code>vendored</code> Cargo feature is enabled, the <code>openssl-src</code> crate will be used to compile and statically link to
a copy of OpenSSL. The build process requires a C compiler, perl, and make. The OpenSSL version will generally track
the newest OpenSSL release, and changes to the version are <em>not</em> considered breaking changes.</p>
<pre><code class="language-toml">[dependencies]
openssl = { version = &quot;0.10&quot;, features = [&quot;vendored&quot;] }
</code></pre>
<p>The vendored copy will not be configured to automatically find the system’s root certificates, but the
<code>openssl-probe</code> crate can be used to do that instead.</p>
<h2 id="automatic" class="section-header"><a href="#automatic">Automatic</a></h2>
<p>The <code>openssl-sys</code> crate will automatically detect OpenSSL installations via Homebrew on macOS and vcpkg on Windows.
Additionally, it will use <code>pkg-config</code> on Unix-like systems to find the system installation.</p>
<pre><code class="language-not_rust"># macOS
$ brew install openssl@1.1
# Arch Linux
$ sudo pacman -S pkg-config openssl
# Debian and Ubuntu
$ sudo apt-get install pkg-config libssl-dev
# Fedora
$ sudo dnf install pkg-config openssl-devel
</code></pre>
<h2 id="manual" class="section-header"><a href="#manual">Manual</a></h2>
<p>A set of environment variables can be used to point <code>openssl-sys</code> towards an OpenSSL installation. They will
override the automatic detection logic.</p>
<ul>
<li><code>OPENSSL_DIR</code> - If specified, the directory of an OpenSSL installation. The directory should contain <code>lib</code> and
<code>include</code> subdirectories containing the libraries and headers respectively.</li>
<li><code>OPENSSL_LIB_DIR</code> and <code>OPENSSL_INCLUDE_DIR</code> - If specified, the directories containing the OpenSSL libraries and
headers respectively. This can be used if the OpenSSL installation is split in a nonstandard directory layout.</li>
<li><code>OPENSSL_STATIC</code> - If set, the crate will statically link to OpenSSL rather than dynamically link.</li>
<li><code>OPENSSL_LIBS</code> - If set, a <code>:</code>-separated list of library names to link to (e.g. <code>ssl:crypto</code>). This can be used
if nonstandard library names were used for whatever reason.</li>
<li><code>OPENSSL_NO_VENDOR</code> - If set, always find OpenSSL in the system, even if the <code>vendored</code> feature is enabled.</li>
</ul>
<p>Additionally, these variables can be prefixed with the upper-cased target architecture (e.g.
<code>X86_64_UNKNOWN_LINUX_GNU_OPENSSL_DIR</code>), which can be useful when cross compiling.</p>
<h1 id="feature-detection" class="section-header"><a href="#feature-detection">Feature Detection</a></h1>
<p>APIs have been added to and removed from the various supported OpenSSL versions, and this library exposes the
functionality available in the version being linked against. This means that methods, constants, and even modules
will be present when building against one version of OpenSSL but not when building against another! APIs will
document any version-specific availability restrictions.</p>
<p>A build script can be used to detect the OpenSSL or LibreSSL version at compile time if needed. The <code>openssl-sys</code>
crate propagates the version via the <code>DEP_OPENSSL_VERSION_NUMBER</code> and <code>DEP_OPENSSL_LIBRESSL_VERSION_NUMBER</code>
environment variables to build scripts. The version format is a hex-encoding of the OpenSSL release version:
<code>0xMNNFFPPS</code>. For example, version 1.0.2g’s encoding is <code>0x1_00_02_07_0</code>.</p>
<p>For example, let’s say we want to adjust the TLSv1.3 cipher suites used by a client, but also want to compile
against OpenSSL versions that don’t support TLSv1.3:</p>
<p>Cargo.toml:</p>
<pre><code class="language-toml">[dependencies]
openssl-sys = &quot;0.9&quot;
openssl = &quot;0.10&quot;
</code></pre>
<p>build.rs:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">env</span>;
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">v</span>) <span class="op">=</span> <span class="ident">env</span>::<span class="ident">var</span>(<span class="string">&quot;DEP_OPENSSL_VERSION_NUMBER&quot;</span>) {
<span class="kw">let</span> <span class="ident">version</span> <span class="op">=</span> <span class="ident">u64</span>::<span class="ident">from_str_radix</span>(<span class="kw-2">&amp;</span><span class="ident">v</span>, <span class="number">16</span>).<span class="ident">unwrap</span>();
<span class="kw">if</span> <span class="ident">version</span> <span class="op">&gt;</span><span class="op">=</span> <span class="number">0x1_01_01_00_0</span> {
<span class="macro">println</span><span class="macro">!</span>(<span class="string">&quot;cargo:rustc-cfg=openssl111&quot;</span>);
}
}
}</pre></div>
<p>lib.rs:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">openssl</span>::<span class="ident">ssl</span>::{<span class="ident">SslConnector</span>, <span class="ident">SslMethod</span>};
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ctx</span> <span class="op">=</span> <span class="ident">SslConnector</span>::<span class="ident">builder</span>(<span class="ident">SslMethod</span>::<span class="ident">tls</span>()).<span class="ident">unwrap</span>();
<span class="comment">// set_ciphersuites was added in OpenSSL 1.1.1, so we can only call it when linking against that version</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">openssl111</span>)]</span>
<span class="ident">ctx</span>.<span class="ident">set_ciphersuites</span>(<span class="string">&quot;TLS_AES_256_GCM_SHA384:TLS_AES_128_GCM_SHA256&quot;</span>).<span class="ident">unwrap</span>();</pre></div>
</div><h2 id="modules" class="section-header"><a href="#modules">Modules</a></h2>
<table><tr class="module-item"><td><a class="mod" href="aes/index.html" title="openssl::aes mod">aes</a></td><td class="docblock-short"><p>Low level AES IGE and key wrapping functionality</p>
</td></tr><tr class="module-item"><td><a class="mod" href="asn1/index.html" title="openssl::asn1 mod">asn1</a></td><td class="docblock-short"><p>Defines the format of certificiates</p>
</td></tr><tr class="module-item"><td><a class="mod" href="base64/index.html" title="openssl::base64 mod">base64</a></td><td class="docblock-short"><p>Base64 encoding support.</p>
</td></tr><tr class="module-item"><td><a class="mod" href="bn/index.html" title="openssl::bn mod">bn</a></td><td class="docblock-short"><p>BigNum implementation</p>
</td></tr><tr class="module-item"><td><a class="mod" href="cms/index.html" title="openssl::cms mod">cms</a></td><td class="docblock-short"><p>SMIME implementation using CMS</p>
</td></tr><tr class="module-item"><td><a class="mod" href="conf/index.html" title="openssl::conf mod">conf</a></td><td class="docblock-short"><p>Interface for processing OpenSSL configuration files.</p>
</td></tr><tr class="module-item"><td><a class="mod" href="derive/index.html" title="openssl::derive mod">derive</a></td><td class="docblock-short"><p>Shared secret derivation.</p>
</td></tr><tr class="module-item"><td><a class="mod" href="dh/index.html" title="openssl::dh mod">dh</a></td><td class="docblock-short"></td></tr><tr class="module-item"><td><a class="mod" href="dsa/index.html" title="openssl::dsa mod">dsa</a></td><td class="docblock-short"><p>Digital Signatures</p>
</td></tr><tr class="module-item"><td><a class="mod" href="ec/index.html" title="openssl::ec mod">ec</a></td><td class="docblock-short"><p>Elliptic Curve</p>
</td></tr><tr class="module-item"><td><a class="mod" href="ecdsa/index.html" title="openssl::ecdsa mod">ecdsa</a></td><td class="docblock-short"><p>Low level Elliptic Curve Digital Signature Algorithm (ECDSA) functions.</p>
</td></tr><tr class="module-item"><td><a class="mod" href="encrypt/index.html" title="openssl::encrypt mod">encrypt</a></td><td class="docblock-short"><p>Message encryption.</p>
</td></tr><tr class="module-item"><td><a class="mod" href="envelope/index.html" title="openssl::envelope mod">envelope</a></td><td class="docblock-short"><p>Envelope encryption.</p>
</td></tr><tr class="module-item"><td><a class="mod" href="error/index.html" title="openssl::error mod">error</a></td><td class="docblock-short"><p>Errors returned by OpenSSL library.</p>
</td></tr><tr class="module-item"><td><a class="mod" href="ex_data/index.html" title="openssl::ex_data mod">ex_data</a></td><td class="docblock-short"></td></tr><tr class="module-item"><td><a class="mod" href="fips/index.html" title="openssl::fips mod">fips</a></td><td class="docblock-short"><p>FIPS 140-2 support.</p>
</td></tr><tr class="module-item"><td><a class="mod" href="hash/index.html" title="openssl::hash mod">hash</a></td><td class="docblock-short"></td></tr><tr class="module-item"><td><a class="mod" href="memcmp/index.html" title="openssl::memcmp mod">memcmp</a></td><td class="docblock-short"><p>Utilities to safely compare cryptographic values.</p>
</td></tr><tr class="module-item"><td><a class="mod" href="nid/index.html" title="openssl::nid mod">nid</a></td><td class="docblock-short"><p>A collection of numerical identifiers for OpenSSL objects.</p>
</td></tr><tr class="module-item"><td><a class="mod" href="ocsp/index.html" title="openssl::ocsp mod">ocsp</a></td><td class="docblock-short"></td></tr><tr class="module-item"><td><a class="mod" href="pkcs5/index.html" title="openssl::pkcs5 mod">pkcs5</a></td><td class="docblock-short"></td></tr><tr class="module-item"><td><a class="mod" href="pkcs7/index.html" title="openssl::pkcs7 mod">pkcs7</a></td><td class="docblock-short"></td></tr><tr class="module-item"><td><a class="mod" href="pkcs12/index.html" title="openssl::pkcs12 mod">pkcs12</a></td><td class="docblock-short"><p>PKCS #12 archives.</p>
</td></tr><tr class="module-item"><td><a class="mod" href="pkey/index.html" title="openssl::pkey mod">pkey</a></td><td class="docblock-short"><p>Public/private key processing.</p>
</td></tr><tr class="module-item"><td><a class="mod" href="rand/index.html" title="openssl::rand mod">rand</a></td><td class="docblock-short"><p>Utilities for secure random number generation.</p>
</td></tr><tr class="module-item"><td><a class="mod" href="rsa/index.html" title="openssl::rsa mod">rsa</a></td><td class="docblock-short"><p>Rivest–Shamir–Adleman cryptosystem</p>
</td></tr><tr class="module-item"><td><a class="mod" href="sha/index.html" title="openssl::sha mod">sha</a></td><td class="docblock-short"><p>The SHA family of hashes.</p>
</td></tr><tr class="module-item"><td><a class="mod" href="sign/index.html" title="openssl::sign mod">sign</a></td><td class="docblock-short"><p>Message signatures.</p>
</td></tr><tr class="module-item"><td><a class="mod" href="srtp/index.html" title="openssl::srtp mod">srtp</a></td><td class="docblock-short"></td></tr><tr class="module-item"><td><a class="mod" href="ssl/index.html" title="openssl::ssl mod">ssl</a></td><td class="docblock-short"><p>SSL/TLS support.</p>
</td></tr><tr class="module-item"><td><a class="mod" href="stack/index.html" title="openssl::stack mod">stack</a></td><td class="docblock-short"></td></tr><tr class="module-item"><td><a class="mod" href="string/index.html" title="openssl::string mod">string</a></td><td class="docblock-short"></td></tr><tr class="module-item"><td><a class="mod" href="symm/index.html" title="openssl::symm mod">symm</a></td><td class="docblock-short"><p>High level interface to certain symmetric ciphers.</p>
</td></tr><tr class="module-item"><td><a class="mod" href="version/index.html" title="openssl::version mod">version</a></td><td class="docblock-short"></td></tr><tr class="module-item"><td><a class="mod" href="x509/index.html" title="openssl::x509 mod">x509</a></td><td class="docblock-short"><p>The standard defining the format of public key certificates.</p>
</td></tr></table><h2 id="functions" class="section-header"><a href="#functions">Functions</a></h2>
<table><tr class="module-item"><td><a class="fn" href="fn.init.html" title="openssl::init fn">init</a></td><td class="docblock-short"></td></tr></table></section><section id="search" class="content hidden"></section><section class="footer"></section><div id="rustdoc-vars" data-root-path="../" data-current-crate="openssl"></div>
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