<!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 `HMAC` struct in crate `openssl`.">
    <meta name="keywords" content="rust, rustlang, rust-lang, HMAC">

    <title>openssl::crypto::hmac::HMAC - Rust</title>

    <link rel="stylesheet" type="text/css" href="../../../rustdoc.css">
    <link rel="stylesheet" type="text/css" href="../../../main.css">
    

    
    
</head>
<body class="rustdoc">
    <!--[if lte IE 8]>
    <div class="warning">
        This old browser is unsupported and will most likely display funky
        things.
    </div>
    <![endif]-->

    

    <nav class="sidebar">
        
        <p class='location'><a href='../../index.html'>openssl</a>::<wbr><a href='../index.html'>crypto</a>::<wbr><a href='index.html'>hmac</a></p><script>window.sidebarCurrent = {name: 'HMAC', ty: 'struct', relpath: ''};</script><script defer src="sidebar-items.js"></script>
    </nav>

    <nav class="sub">
        <form class="search-form js-only">
            <div class="search-container">
                <input class="search-input" name="search"
                       autocomplete="off"
                       placeholder="Click or press ‘S’ to search, ‘?’ for more options…"
                       type="search">
            </div>
        </form>
    </nav>

    <section id='main' class="content struct">
<h1 class='fqn'><span class='in-band'>Struct <a href='../../index.html'>openssl</a>::<wbr><a href='../index.html'>crypto</a>::<wbr><a href='index.html'>hmac</a>::<wbr><a class='struct' href=''>HMAC</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 id='src-619' class='srclink' href='../../../src/openssl/crypto/hmac.rs.html#65-69' title='goto source code'>[src]</a></span></h1>
<pre class='rust struct'>pub struct HMAC {
    // some fields omitted
}</pre><div class='docblock'><p>Provides HMAC computation.</p>

<h1 id='examples' class='section-header'><a href='#examples'>Examples</a></h1>
<p>Calculate a HMAC in one go.</p>

<pre class='rust rust-example-rendered'>
<span class='kw'>use</span> <span class='ident'>openssl</span>::<span class='ident'>crypto</span>::<span class='ident'>hash</span>::<span class='ident'>Type</span>;
<span class='kw'>use</span> <span class='ident'>openssl</span>::<span class='ident'>crypto</span>::<span class='ident'>hmac</span>::<span class='ident'>hmac</span>;
<span class='kw'>let</span> <span class='ident'>key</span> <span class='op'>=</span> <span class='string'>b&quot;Jefe&quot;</span>;
<span class='kw'>let</span> <span class='ident'>data</span> <span class='op'>=</span> <span class='string'>b&quot;what do ya want for nothing?&quot;</span>;
<span class='kw'>let</span> <span class='ident'>spec</span> <span class='op'>=</span> <span class='string'>b&quot;\x75\x0c\x78\x3e\x6a\xb0\xb5\x03\xea\xa8\x6e\x31\x0a\x5d\xb7\x38&quot;</span>;
<span class='kw'>let</span> <span class='ident'>res</span> <span class='op'>=</span> <span class='ident'>hmac</span>(<span class='ident'>Type</span>::<span class='ident'>MD5</span>, <span class='ident'>key</span>, <span class='ident'>data</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>res</span>, <span class='ident'>spec</span>);</pre>

<p>Use the <code>Write</code> trait to supply the input in chunks.</p>

<pre class='rust rust-example-rendered'>
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>io</span>::<span class='ident'>prelude</span>::<span class='op'>*</span>;
<span class='kw'>use</span> <span class='ident'>openssl</span>::<span class='ident'>crypto</span>::<span class='ident'>hash</span>::<span class='ident'>Type</span>;
<span class='kw'>use</span> <span class='ident'>openssl</span>::<span class='ident'>crypto</span>::<span class='ident'>hmac</span>::<span class='ident'>HMAC</span>;
<span class='kw'>let</span> <span class='ident'>key</span> <span class='op'>=</span> <span class='string'>b&quot;Jefe&quot;</span>;
<span class='kw'>let</span> <span class='ident'>data</span>: <span class='kw-2'>&amp;</span>[<span class='kw-2'>&amp;</span>[<span class='ident'>u8</span>]] <span class='op'>=</span> <span class='kw-2'>&amp;</span>[<span class='string'>b&quot;what do ya &quot;</span>, <span class='string'>b&quot;want for nothing?&quot;</span>];
<span class='kw'>let</span> <span class='ident'>spec</span> <span class='op'>=</span> <span class='string'>b&quot;\x75\x0c\x78\x3e\x6a\xb0\xb5\x03\xea\xa8\x6e\x31\x0a\x5d\xb7\x38&quot;</span>;
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>h</span> <span class='op'>=</span> <span class='ident'>HMAC</span>::<span class='ident'>new</span>(<span class='ident'>Type</span>::<span class='ident'>MD5</span>, <span class='kw-2'>&amp;</span><span class='op'>*</span><span class='ident'>key</span>);
<span class='ident'>h</span>.<span class='ident'>write_all</span>(<span class='ident'>data</span>[<span class='number'>0</span>]);
<span class='ident'>h</span>.<span class='ident'>write_all</span>(<span class='ident'>data</span>[<span class='number'>1</span>]);
<span class='kw'>let</span> <span class='ident'>res</span> <span class='op'>=</span> <span class='ident'>h</span>.<span class='ident'>finish</span>();
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>res</span>, <span class='ident'>spec</span>);</pre>
</div><h2 id='methods'>Methods</h2><h3 class='impl'><span class='in-band'><code>impl <a class='struct' href='../../../openssl/crypto/hmac/struct.HMAC.html' title='openssl::crypto::hmac::HMAC'>HMAC</a></code></span><span class='out-of-band'><div class='ghost'></div><a id='src-623' class='srclink' href='../../../src/openssl/crypto/hmac.rs.html#71-162' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.new' class='method'><code>fn <a href='#method.new' class='fnname'>new</a>(ty: <a class='enum' href='../../../openssl/crypto/hash/enum.Type.html' title='openssl::crypto::hash::Type'>Type</a>, key: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>&amp;[</a><a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.u8.html'>u8</a><a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>]</a>) -&gt; <a class='struct' href='../../../openssl/crypto/hmac/struct.HMAC.html' title='openssl::crypto::hmac::HMAC'>HMAC</a></code></h4>
<div class='docblock'><p>Creates a new <code>HMAC</code> with the specified hash type using the <code>key</code>.</p>
</div><h4 id='method.finish' class='method'><code>fn <a href='#method.finish' class='fnname'>finish</a>(&amp;mut self) -&gt; <a class='struct' href='https://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html' title='collections::vec::Vec'>Vec</a>&lt;<a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.u8.html'>u8</a>&gt;</code></h4>
<div class='docblock'><p>Returns the hash of the data written since creation or
the last <code>finish</code> and resets the hasher.</p>
</div></div><h2 id='implementations'>Trait Implementations</h2><h3 class='impl'><span class='in-band'><code>impl <a class='trait' href='https://doc.rust-lang.org/nightly/std/io/trait.Write.html' title='std::io::Write'>Write</a> for <a class='struct' href='../../../openssl/crypto/hmac/struct.HMAC.html' title='openssl::crypto::hmac::HMAC'>HMAC</a></code></span><span class='out-of-band'><div class='ghost'></div><a id='src-684' class='srclink' href='../../../src/openssl/crypto/hmac.rs.html#164-174' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.write' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/std/io/trait.Write.html#tymethod.write' class='fnname'>write</a>(&amp;mut self, buf: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>&amp;[</a><a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.u8.html'>u8</a><a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>]</a>) -&gt; <a class='type' href='https://doc.rust-lang.org/nightly/std/io/error/type.Result.html' title='std::io::error::Result'>Result</a>&lt;<a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.usize.html'>usize</a>&gt;</code></h4>
<div class='docblock'><p>Write a buffer into this object, returning how many bytes were written. <a href="https://doc.rust-lang.org/nightly/std/io/trait.Write.html#tymethod.write">Read more</a></p>
</div><h4 id='method.flush' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/std/io/trait.Write.html#tymethod.flush' class='fnname'>flush</a>(&amp;mut self) -&gt; <a class='type' href='https://doc.rust-lang.org/nightly/std/io/error/type.Result.html' title='std::io::error::Result'>Result</a>&lt;<a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.tuple.html'>()</a>&gt;</code></h4>
<div class='docblock'><p>Flush this output stream, ensuring that all intermediately buffered contents reach their destination. <a href="https://doc.rust-lang.org/nightly/std/io/trait.Write.html#tymethod.flush">Read more</a></p>
</div><h4 id='method.write_all' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/std/io/trait.Write.html#method.write_all' class='fnname'>write_all</a>(&amp;mut self, buf: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>&amp;[</a><a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.u8.html'>u8</a><a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>]</a>) -&gt; <a class='enum' href='https://doc.rust-lang.org/nightly/core/result/enum.Result.html' title='core::result::Result'>Result</a>&lt;<a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.tuple.html'>()</a>,&nbsp;<a class='struct' href='https://doc.rust-lang.org/nightly/std/io/error/struct.Error.html' title='std::io::error::Error'>Error</a>&gt;</code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
<div class='docblock'><p>Attempts to write an entire buffer into this write. <a href="https://doc.rust-lang.org/nightly/std/io/trait.Write.html#method.write_all">Read more</a></p>
</div><h4 id='method.write_fmt' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/std/io/trait.Write.html#method.write_fmt' class='fnname'>write_fmt</a>(&amp;mut self, fmt: <a class='struct' href='https://doc.rust-lang.org/nightly/core/fmt/struct.Arguments.html' title='core::fmt::Arguments'>Arguments</a>) -&gt; <a class='enum' href='https://doc.rust-lang.org/nightly/core/result/enum.Result.html' title='core::result::Result'>Result</a>&lt;<a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.tuple.html'>()</a>,&nbsp;<a class='struct' href='https://doc.rust-lang.org/nightly/std/io/error/struct.Error.html' title='std::io::error::Error'>Error</a>&gt;</code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
<div class='docblock'><p>Writes a formatted string into this writer, returning any error encountered. <a href="https://doc.rust-lang.org/nightly/std/io/trait.Write.html#method.write_fmt">Read more</a></p>
</div><h4 id='method.by_ref' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/std/io/trait.Write.html#method.by_ref' class='fnname'>by_ref</a>(&amp;mut self) -&gt; &amp;mut Self</code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
<div class='docblock'><p>Creates a &quot;by reference&quot; adaptor for this instance of <code>Write</code>. <a href="https://doc.rust-lang.org/nightly/std/io/trait.Write.html#method.by_ref">Read more</a></p>
</div></div><h3 class='impl'><span class='in-band'><code>impl <a class='trait' href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html' title='core::clone::Clone'>Clone</a> for <a class='struct' href='../../../openssl/crypto/hmac/struct.HMAC.html' title='openssl::crypto::hmac::HMAC'>HMAC</a></code></span><span class='out-of-band'><div class='ghost'></div><a id='src-690' class='srclink' href='../../../src/openssl/crypto/hmac.rs.html#176-190' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.clone' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone' class='fnname'>clone</a>(&amp;self) -&gt; <a class='struct' href='../../../openssl/crypto/hmac/struct.HMAC.html' title='openssl::crypto::hmac::HMAC'>HMAC</a></code></h4>
<div class='docblock'><p>Returns a copy of the value. <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone">Read more</a></p>
</div><h4 id='method.clone_from' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from' class='fnname'>clone_from</a>(&amp;mut self, source: &amp;Self)</code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
<div class='docblock'><p>Performs copy-assignment from <code>source</code>. <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from">Read more</a></p>
</div></div><h3 class='impl'><span class='in-band'><code>impl <a class='trait' href='https://doc.rust-lang.org/nightly/core/ops/trait.Drop.html' title='core::ops::Drop'>Drop</a> for <a class='struct' href='../../../openssl/crypto/hmac/struct.HMAC.html' title='openssl::crypto::hmac::HMAC'>HMAC</a></code></span><span class='out-of-band'><div class='ghost'></div><a id='src-701' class='srclink' href='../../../src/openssl/crypto/hmac.rs.html#192-203' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.drop' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/core/ops/trait.Drop.html#tymethod.drop' class='fnname'>drop</a>(&amp;mut self)</code></h4>
<div class='docblock'><p>A method called when the value goes out of scope. <a href="https://doc.rust-lang.org/nightly/core/ops/trait.Drop.html#tymethod.drop">Read more</a></p>
</div></div></section>
    <section id='search' class="content hidden"></section>

    <section class="footer"></section>

    <aside id="help" class="hidden">
        <div>
            <h1 class="hidden">Help</h1>

            <div class="shortcuts">
                <h2>Keyboard Shortcuts</h2>

                <dl>
                    <dt>?</dt>
                    <dd>Show this help dialog</dd>
                    <dt>S</dt>
                    <dd>Focus the search field</dd>
                    <dt>&larrb;</dt>
                    <dd>Move up in search results</dd>
                    <dt>&rarrb;</dt>
                    <dd>Move down in search results</dd>
                    <dt>&#9166;</dt>
                    <dd>Go to active search result</dd>
                    <dt>+</dt>
                    <dd>Collapse/expand all sections</dd>
                </dl>
            </div>

            <div class="infos">
                <h2>Search Tricks</h2>

                <p>
                    Prefix searches with a type followed by a colon (e.g.
                    <code>fn:</code>) to restrict the search to a given type.
                </p>

                <p>
                    Accepted types are: <code>fn</code>, <code>mod</code>,
                    <code>struct</code>, <code>enum</code>,
                    <code>trait</code>, <code>type</code>, <code>macro</code>,
                    and <code>const</code>.
                </p>

                <p>
                    Search functions by type signature (e.g.
                    <code>vec -> usize</code> or <code>* -> vec</code>)
                </p>
            </div>
        </div>
    </aside>

    

    <script>
        window.rootPath = "../../../";
        window.currentCrate = "openssl";
        window.playgroundUrl = "";
    </script>
    <script src="../../../jquery.js"></script>
    <script src="../../../main.js"></script>
    
    <script defer src="../../../search-index.js"></script>
</body>
</html>