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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 `sha` mod in crate `openssl`."><meta name="keywords" content="rust, rustlang, rust-lang, sha"><title>openssl::sha - 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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<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">☰</div><a href='../../openssl/index.html'><div class='logo-container rust-logo'><img src='../../rust-logo.png' alt='logo'></div></a><p class="location">Module sha</p><div class="sidebar-elems"><div class="block items"><ul><li><a href="#structs">Structs</a></li><li><a href="#functions">Functions</a></li></ul></div><p class="location"><a href="../index.html">openssl</a></p><script>window.sidebarCurrent = {name: "sha", ty: "mod", relpath: "../"};</script><script defer src="../sidebar-items.js"></script></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>
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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="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span><a class="srclink" href="../../src/openssl/sha.rs.html#1-446" title="goto source code">[src]</a></span><span class="in-band">Module <a href="../index.html">openssl</a>::<wbr><a class="mod" href="">sha</a></span></h1><div class="docblock"><p>The SHA family of hashes.</p>
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<p>SHA, or Secure Hash Algorithms, are a family of cryptographic hashing algorithms published by
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the National Institute of Standards and Technology (NIST). Hash algorithms such as those in
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the SHA family are used to map data of an arbitrary size to a fixed-size string of bytes.
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As cryptographic hashing algorithms, these mappings have the property of being irreversable.
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This property makes hash algorithms like these excellent for uses such as verifying the
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contents of a file- if you know the hash you expect beforehand, then you can verify that the
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data you have is correct if it hashes to the same value.</p>
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<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
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<p>When dealing with data that becomes available in chunks, such as while buffering data from IO,
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you can create a hasher that you can repeatedly update to add bytes to.</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">openssl</span>::<span class="ident">sha</span>;
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">hasher</span> <span class="op">=</span> <span class="ident">sha</span>::<span class="ident">Sha256</span>::<span class="ident">new</span>();
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<span class="ident">hasher</span>.<span class="ident">update</span>(<span class="string">b"Hello, "</span>);
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<span class="ident">hasher</span>.<span class="ident">update</span>(<span class="string">b"world"</span>);
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<span class="kw">let</span> <span class="ident">hash</span> <span class="op">=</span> <span class="ident">hasher</span>.<span class="ident">finish</span>();
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"Hashed \"Hello, world\" to {}"</span>, <span class="ident">hex</span>::<span class="ident">encode</span>(<span class="ident">hash</span>));</pre></div>
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<p>On the other hand, if you already have access to all of the data you woud like to hash, you
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may prefer to use the slightly simpler method of simply calling the hash function corresponding
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to the algorithm you want to use.</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">openssl</span>::<span class="ident">sha</span>::<span class="ident">sha256</span>;
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<span class="kw">let</span> <span class="ident">hash</span> <span class="op">=</span> <span class="ident">sha256</span>(<span class="string">b"your data or message"</span>);
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"Hash = {}"</span>, <span class="ident">hex</span>::<span class="ident">encode</span>(<span class="ident">hash</span>));</pre></div>
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</div><h2 id="structs" class="section-header"><a href="#structs">Structs</a></h2>
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<table><tr class="module-item"><td><a class="struct" href="struct.Sha1.html" title="openssl::sha::Sha1 struct">Sha1</a></td><td class="docblock-short"><p>An object which calculates a SHA1 hash of some data.</p>
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</td></tr><tr class="module-item"><td><a class="struct" href="struct.Sha224.html" title="openssl::sha::Sha224 struct">Sha224</a></td><td class="docblock-short"><p>An object which calculates a SHA224 hash of some data.</p>
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</td></tr><tr class="module-item"><td><a class="struct" href="struct.Sha256.html" title="openssl::sha::Sha256 struct">Sha256</a></td><td class="docblock-short"><p>An object which calculates a SHA256 hash of some data.</p>
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</td></tr><tr class="module-item"><td><a class="struct" href="struct.Sha384.html" title="openssl::sha::Sha384 struct">Sha384</a></td><td class="docblock-short"><p>An object which calculates a SHA384 hash of some data.</p>
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</td></tr><tr class="module-item"><td><a class="struct" href="struct.Sha512.html" title="openssl::sha::Sha512 struct">Sha512</a></td><td class="docblock-short"><p>An object which calculates a SHA512 hash of some data.</p>
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</td></tr></table><h2 id="functions" class="section-header"><a href="#functions">Functions</a></h2>
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<table><tr class="module-item"><td><a class="fn" href="fn.sha1.html" title="openssl::sha::sha1 fn">sha1</a></td><td class="docblock-short"><p>Computes the SHA1 hash of some data.</p>
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</td></tr><tr class="module-item"><td><a class="fn" href="fn.sha224.html" title="openssl::sha::sha224 fn">sha224</a></td><td class="docblock-short"><p>Computes the SHA224 hash of some data.</p>
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</td></tr><tr class="module-item"><td><a class="fn" href="fn.sha256.html" title="openssl::sha::sha256 fn">sha256</a></td><td class="docblock-short"><p>Computes the SHA256 hash of some data.</p>
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</td></tr><tr class="module-item"><td><a class="fn" href="fn.sha384.html" title="openssl::sha::sha384 fn">sha384</a></td><td class="docblock-short"><p>Computes the SHA384 hash of some data.</p>
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</td></tr><tr class="module-item"><td><a class="fn" href="fn.sha512.html" title="openssl::sha::sha512 fn">sha512</a></td><td class="docblock-short"><p>Computes the SHA512 hash of some data.</p>
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