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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 `rand` mod in crate `ring`."><meta name="keywords" content="rust, rustlang, rust-lang, rand"><title>ring::rand - 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='../../ring/index.html'><div class='logo-container rust-logo'><img src='../../rust-logo.png' alt='logo'></div></a><p class="location">Module rand</p><div class="sidebar-elems"><div class="block items"><ul><li><a href="#structs">Structs</a></li><li><a href="#traits">Traits</a></li><li><a href="#functions">Functions</a></li></ul></div><p class="location"><a href="../index.html">ring</a></p><div id="sidebar-vars" data-name="rand" data-ty="mod" data-relpath="../"></div><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="in-band">Module <a href="../index.html">ring</a>::<wbr><a class="mod" href="">rand</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">−</span>]</a></span><a class="srclink" href="../../src/ring/rand.rs.html#15-433" title="goto source code">[src]</a></span></h1><div class="docblock"><p>Cryptographic pseudo-random number generation.</p>
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<p>An application should create a single <code>SystemRandom</code> and then use it for
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all randomness generation. Functions that generate random bytes should take
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a <code>&dyn SecureRandom</code> parameter instead of instantiating their own. Besides
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being more efficient, this also helps document where non-deterministic
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(random) outputs occur. Taking a reference to a <code>SecureRandom</code> also helps
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with testing techniques like fuzzing, where it is useful to use a
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(non-secure) deterministic implementation of <code>SecureRandom</code> so that results
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can be replayed. Following this pattern also may help with sandboxing
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(seccomp filters on Linux in particular). See <code>SystemRandom</code>'s
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documentation for more details.</p>
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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.Random.html" title="ring::rand::Random struct">Random</a></td><td class="docblock-short"><p>A random value constructed from a <code>SecureRandom</code> that hasn't been exposed
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through any safe Rust interface.</p>
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</td></tr><tr class="module-item"><td><a class="struct" href="struct.SystemRandom.html" title="ring::rand::SystemRandom struct">SystemRandom</a></td><td class="docblock-short"><p>A secure random number generator where the random values come directly
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from the operating system.</p>
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</td></tr></table><h2 id="traits" class="section-header"><a href="#traits">Traits</a></h2>
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<table><tr class="module-item"><td><a class="trait" href="trait.RandomlyConstructable.html" title="ring::rand::RandomlyConstructable trait">RandomlyConstructable</a></td><td class="docblock-short"><p>A type that can be returned by <code>ring::rand::generate()</code>.</p>
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</td></tr><tr class="module-item"><td><a class="trait" href="trait.SecureRandom.html" title="ring::rand::SecureRandom trait">SecureRandom</a></td><td class="docblock-short"><p>A secure random number generator.</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.generate.html" title="ring::rand::generate fn">generate</a></td><td class="docblock-short"><p>Generate the new random value using <code>rng</code>.</p>
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