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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 `JitterRng` struct in crate `rand`."><meta name="keywords" content="rust, rustlang, rust-lang, JitterRng"><title>rand::rngs::JitterRng - 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="../../dark.css"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script src="../../storage.js"></script><link rel="shortcut icon" href="https://www.rust-lang.org/favicon.ico"></head><body class="rustdoc struct"><!--[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='../../rand/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk.png' alt='logo' width='100'></a><p class='location'>Struct JitterRng</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.new">new</a><a href="#method.new_with_timer">new_with_timer</a><a href="#method.set_rounds">set_rounds</a><a href="#method.test_timer">test_timer</a><a href="#method.timer_stats">timer_stats</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Debug">Debug</a><a href="#impl-Clone">Clone</a><a href="#impl-RngCore">RngCore</a><a href="#impl-CryptoRng">CryptoRng</a></div><a class="sidebar-title" href="#synthetic-implementations">Auto Trait Implementations</a><div class="sidebar-links"><a href="#impl-Send">Send</a><a href="#impl-Sync">Sync</a></div></div><p class='location'><a href='../index.html'>rand</a>::<wbr><a href='index.html'>rngs</a></p><script>window.sidebarCurrent = {name: 'JitterRng', ty: 'struct', relpath: ''};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../theme.js"></script><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"><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'>Struct <a href='../index.html'>rand</a>::<wbr><a href='index.html'>rngs</a>::<wbr><a class="struct" href=''>JitterRng</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/rand/rngs/jitter.rs.html#138-148' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class='rust struct'>pub struct JitterRng { /* fields omitted */ }</pre></div><div class='docblock'><p>A true random number generator based on jitter in the CPU execution time,
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and jitter in memory access time.</p>
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<p>This is a true random number generator, as opposed to pseudo-random
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generators. Random numbers generated by <code>JitterRng</code> can be seen as fresh
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entropy. A consequence is that is orders of magnitude slower than <a href="struct.OsRng.html"><code>OsRng</code></a>
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and PRNGs (about 10<sup>3</sup>..10<sup>6</sup> slower).</p>
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<p>There are very few situations where using this RNG is appropriate. Only very
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few applications require true entropy. A normal PRNG can be statistically
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indistinguishable, and a cryptographic PRNG should also be as impossible to
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predict.</p>
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<p>Use of <code>JitterRng</code> is recommended for initializing cryptographic PRNGs when
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<a href="struct.OsRng.html"><code>OsRng</code></a> is not available.</p>
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<p><code>JitterRng</code> can be used without the standard library, but not conveniently,
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you must provide a high-precision timer and carefully have to follow the
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instructions of <a href="struct.JitterRng.html#method.new_with_timer"><code>new_with_timer</code></a>.</p>
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<p>This implementation is based on
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<a href="http://www.chronox.de/jent.html">Jitterentropy</a> version 2.1.0.</p>
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<p>Note: There is no accurate timer available on Wasm platforms, to help
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prevent fingerprinting or timing side-channel attacks. Therefore
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<a href="struct.JitterRng.html#method.new"><code>JitterRng::new()</code></a> is not available on Wasm.</p>
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<h1 id="quality-testing" class="section-header"><a href="#quality-testing">Quality testing</a></h1>
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<p><a href="struct.JitterRng.html#method.new"><code>JitterRng::new()</code></a> has build-in, but limited, quality testing, however
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before using <code>JitterRng</code> on untested hardware, or after changes that could
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effect how the code is optimized (such as a new LLVM version), it is
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recommend to run the much more stringent
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<a href="https://github.com/usnistgov/SP800-90B_EntropyAssessment">NIST SP 800-90B Entropy Estimation Suite</a>.</p>
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<p>Use the following code using <a href="struct.JitterRng.html#method.timer_stats"><code>timer_stats</code></a> to collect the data:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">rand</span>::<span class="ident">jitter</span>::<span class="ident">JitterRng</span>;
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rng</span> <span class="op">=</span> <span class="ident">JitterRng</span>::<span class="ident">new</span>()<span class="question-mark">?</span>;
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<span class="comment">// 1_000_000 results are required for the</span>
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<span class="comment">// NIST SP 800-90B Entropy Estimation Suite</span>
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<span class="kw">const</span> <span class="ident">ROUNDS</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">1_000_000</span>;
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">deltas_variable</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">with_capacity</span>(<span class="ident">ROUNDS</span>);
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">deltas_minimal</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">with_capacity</span>(<span class="ident">ROUNDS</span>);
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<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">ROUNDS</span> {
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<span class="ident">deltas_variable</span>.<span class="ident">push</span>(<span class="ident">rng</span>.<span class="ident">timer_stats</span>(<span class="bool-val">true</span>) <span class="kw">as</span> <span class="ident">u8</span>);
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<span class="ident">deltas_minimal</span>.<span class="ident">push</span>(<span class="ident">rng</span>.<span class="ident">timer_stats</span>(<span class="bool-val">false</span>) <span class="kw">as</span> <span class="ident">u8</span>);
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}
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<span class="comment">// Write out after the statistics collection loop, to not disturb the</span>
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<span class="comment">// test results.</span>
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<span class="ident">File</span>::<span class="ident">create</span>(<span class="string">"jitter_rng_var.bin"</span>)<span class="question-mark">?</span>.<span class="ident">write</span>(<span class="kw-2">&</span><span class="ident">deltas_variable</span>)<span class="question-mark">?</span>;
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<span class="ident">File</span>::<span class="ident">create</span>(<span class="string">"jitter_rng_min.bin"</span>)<span class="question-mark">?</span>.<span class="ident">write</span>(<span class="kw-2">&</span><span class="ident">deltas_minimal</span>)<span class="question-mark">?</span>;</pre>
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<p>This will produce two files: <code>jitter_rng_var.bin</code> and <code>jitter_rng_min.bin</code>.
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Run the Entropy Estimation Suite in three configurations, as outlined below.
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Every run has two steps. One step to produce an estimation, another to
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validate the estimation.</p>
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<ol>
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<li>Estimate the expected amount of entropy that is at least available with
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each round of the entropy collector. This number should be greater than
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the amount estimated with <code>64 / test_timer()</code>.
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<pre><code class="language-sh">python noniid_main.py -v jitter_rng_var.bin 8
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restart.py -v jitter_rng_var.bin 8 <min-entropy>
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</code></pre>
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</li>
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<li>Estimate the expected amount of entropy that is available in the last 4
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bits of the timer delta after running noice sources. Note that a value of
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<code>3.70</code> is the minimum estimated entropy for true randomness.
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<pre><code class="language-sh">python noniid_main.py -v -u 4 jitter_rng_var.bin 4
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restart.py -v -u 4 jitter_rng_var.bin 4 <min-entropy>
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</code></pre>
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</li>
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<li>Estimate the expected amount of entropy that is available to the entropy
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collector if both noice sources only run their minimal number of times.
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This measures the absolute worst-case, and gives a lower bound for the
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available entropy.
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<pre><code class="language-sh">python noniid_main.py -v -u 4 jitter_rng_min.bin 4
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restart.py -v -u 4 jitter_rng_min.bin 4 <min-entropy>
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</code></pre>
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</li>
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</ol>
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</div><h2 id='methods' class='small-section-header'>Methods<a href='#methods' class='anchor'></a></h2><h3 id='impl' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="struct" href="../../rand/rngs/struct.JitterRng.html" title="struct rand::rngs::JitterRng">JitterRng</a></code><a href='#impl' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/rand/rngs/jitter.rs.html#278-774' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.new' class="method"><span id='new.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.new' class='fnname'>new</a>() -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="struct" href="../../rand/rngs/struct.JitterRng.html" title="struct rand::rngs::JitterRng">JitterRng</a>, <a class="enum" href="../../rand/rngs/enum.TimerError.html" title="enum rand::rngs::TimerError">TimerError</a>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/rand/rngs/jitter.rs.html#287-302' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Create a new <code>JitterRng</code>. Makes use of <code>std::time</code> for a timer, or a
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platform-specific function with higher accuracy if necessary and
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available.</p>
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<p>During initialization CPU execution timing jitter is measured a few
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hundred times. If this does not pass basic quality tests, an error is
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returned. The test result is cached to make subsequent calls faster.</p>
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</div><h4 id='method.new_with_timer' class="method"><span id='new_with_timer.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.new_with_timer' class='fnname'>new_with_timer</a>(timer: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.fn.html">fn</a>() -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a>) -> <a class="struct" href="../../rand/rngs/struct.JitterRng.html" title="struct rand::rngs::JitterRng">JitterRng</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/rand/rngs/jitter.rs.html#349-357' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Create a new <code>JitterRng</code>.
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A custom timer can be supplied, making it possible to use <code>JitterRng</code> in
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<code>no_std</code> environments.</p>
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<p>The timer must have nanosecond precision.</p>
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<p>This method is more low-level than <code>new()</code>. It is the responsibility of
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the caller to run <a href="struct.JitterRng.html#method.test_timer"><code>test_timer</code></a> before using any numbers generated with
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<code>JitterRng</code>, and optionally call <a href="struct.JitterRng.html#method.set_rounds"><code>set_rounds</code></a>. Also it is important to
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consume at least one <code>u64</code> before using the first result to initialize
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the entropy collection pool.</p>
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<h1 id="example" class="section-header"><a href="#example">Example</a></h1>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">rand</span>::<span class="ident">jitter</span>::<span class="ident">JitterRng</span>;
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<span class="kw">fn</span> <span class="ident">get_nstime</span>() <span class="op">-></span> <span class="ident">u64</span> {
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">time</span>::{<span class="ident">SystemTime</span>, <span class="ident">UNIX_EPOCH</span>};
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<span class="kw">let</span> <span class="ident">dur</span> <span class="op">=</span> <span class="ident">SystemTime</span>::<span class="ident">now</span>().<span class="ident">duration_since</span>(<span class="ident">UNIX_EPOCH</span>).<span class="ident">unwrap</span>();
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<span class="comment">// The correct way to calculate the current time is</span>
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<span class="comment">// `dur.as_secs() * 1_000_000_000 + dur.subsec_nanos() as u64`</span>
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<span class="comment">// But this is faster, and the difference in terms of entropy is</span>
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<span class="comment">// negligible (log2(10^9) == 29.9).</span>
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<span class="ident">dur</span>.<span class="ident">as_secs</span>() <span class="op"><<</span> <span class="number">30</span> <span class="op">|</span> <span class="ident">dur</span>.<span class="ident">subsec_nanos</span>() <span class="kw">as</span> <span class="ident">u64</span>
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}
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rng</span> <span class="op">=</span> <span class="ident">JitterRng</span>::<span class="ident">new_with_timer</span>(<span class="ident">get_nstime</span>);
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<span class="kw">let</span> <span class="ident">rounds</span> <span class="op">=</span> <span class="ident">rng</span>.<span class="ident">test_timer</span>()<span class="question-mark">?</span>;
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<span class="ident">rng</span>.<span class="ident">set_rounds</span>(<span class="ident">rounds</span>); <span class="comment">// optional</span>
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<span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">rng</span>.<span class="ident">gen</span>::<span class="op"><</span><span class="ident">u64</span><span class="op">></span>();
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<span class="comment">// Ready for use</span>
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<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="ident">rng</span>.<span class="ident">gen</span>();
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</pre>
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</div><h4 id='method.set_rounds' class="method"><span id='set_rounds.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.set_rounds' class='fnname'>set_rounds</a>(&mut self, rounds: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>)</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/rand/rngs/jitter.rs.html#369-372' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Configures how many rounds are used to generate each 64-bit value.
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This must be greater than zero, and has a big impact on performance
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and output quality.</p>
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<p><a href="struct.JitterRng.html#method.new_with_timer"><code>new_with_timer</code></a> conservatively uses 64 rounds, but often less rounds
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can be used. The <code>test_timer()</code> function returns the minimum number of
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rounds required for full strength (platform dependent), so one may use
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<code>rng.set_rounds(rng.test_timer()?);</code> or cache the value.</p>
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</div><h4 id='method.test_timer' class="method"><span id='test_timer.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.test_timer' class='fnname'>test_timer</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>, <a class="enum" href="../../rand/rngs/enum.TimerError.html" title="enum rand::rngs::TimerError">TimerError</a>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/rand/rngs/jitter.rs.html#614-749' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Basic quality tests on the timer, by measuring CPU timing jitter a few
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hundred times.</p>
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<p>If succesful, this will return the estimated number of rounds necessary
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to collect 64 bits of entropy. Otherwise a <a href="enum.TimerError.html"><code>TimerError</code></a> with the cause
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of the failure will be returned.</p>
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</div><h4 id='method.timer_stats' class="method"><span id='timer_stats.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.timer_stats' class='fnname'>timer_stats</a>(&mut self, var_rounds: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i64.html">i64</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/rand/rngs/jitter.rs.html#765-773' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Statistical test: return the timer delta of one normal run of the
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<code>JitterRng</code> entropy collector.</p>
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<p>Setting <code>var_rounds</code> to <code>true</code> will execute the memory access and the
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CPU jitter noice sources a variable amount of times (just like a real
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<code>JitterRng</code> round).</p>
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<p>Setting <code>var_rounds</code> to <code>false</code> will execute the noice sources the
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minimal number of times. This can be used to measure the minimum amount
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of entropy one round of the entropy collector can collect in the worst
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case.</p>
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<p>See <a href="struct.JitterRng.html#quality-testing">Quality testing</a> on how to
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use <code>timer_stats</code> to test the quality of <code>JitterRng</code>.</p>
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</div></div><h2 id='implementations' class='small-section-header'>Trait Implementations<a href='#implementations' class='anchor'></a></h2><div id='implementations-list'><h3 id='impl-Debug' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="../../rand/rngs/struct.JitterRng.html" title="struct rand::rngs::JitterRng">JitterRng</a></code><a href='#impl-Debug' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/rand/rngs/jitter.rs.html#200-204' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.fmt' class="method"><span id='fmt.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&self, f: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -> <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/rand/rngs/jitter.rs.html#201-203' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
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</div></div><h3 id='impl-Clone' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> for <a class="struct" href="../../rand/rngs/struct.JitterRng.html" title="struct rand::rngs::JitterRng">JitterRng</a></code><a href='#impl-Clone' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/rand/rngs/jitter.rs.html#206-218' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.clone' class="method"><span id='clone.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone' class='fnname'>clone</a>(&self) -> <a class="struct" href="../../rand/rngs/struct.JitterRng.html" title="struct rand::rngs::JitterRng">JitterRng</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/rand/rngs/jitter.rs.html#207-217' title='goto source code'>[src]</a></td></tr></tbody></table></span></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>
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</div><h4 id='method.clone_from' class="method"><span id='clone_from.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from' class='fnname'>clone_from</a>(&mut self, source: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>Self)</code></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/clone.rs.html#130-132' title='goto source code'>[src]</a></td></tr></tbody></table></span></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>
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</div></div><h3 id='impl-RngCore' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="../../rand/trait.RngCore.html" title="trait rand::RngCore">RngCore</a> for <a class="struct" href="../../rand/rngs/struct.JitterRng.html" title="struct rand::rngs::JitterRng">JitterRng</a></code><a href='#impl-RngCore' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/rand/rngs/jitter.rs.html#825-855' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.next_u32' class="method"><span id='next_u32.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../rand/trait.RngCore.html#tymethod.next_u32' class='fnname'>next_u32</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/rand/rngs/jitter.rs.html#826-836' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Return the next random <code>u32</code>. <a href="../../rand/trait.RngCore.html#tymethod.next_u32">Read more</a></p>
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</div><h4 id='method.next_u64' class="method"><span id='next_u64.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../rand/trait.RngCore.html#tymethod.next_u64' class='fnname'>next_u64</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/rand/rngs/jitter.rs.html#838-841' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Return the next random <code>u64</code>. <a href="../../rand/trait.RngCore.html#tymethod.next_u64">Read more</a></p>
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</div><h4 id='method.fill_bytes' class="method"><span id='fill_bytes.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../rand/trait.RngCore.html#tymethod.fill_bytes' class='fnname'>fill_bytes</a>(&mut self, dest: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&mut [</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>)</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/rand/rngs/jitter.rs.html#843-850' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Fill <code>dest</code> with random data. <a href="../../rand/trait.RngCore.html#tymethod.fill_bytes">Read more</a></p>
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</div><h4 id='method.try_fill_bytes' class="method"><span id='try_fill_bytes.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../rand/trait.RngCore.html#tymethod.try_fill_bytes' class='fnname'>try_fill_bytes</a>(&mut self, dest: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&mut [</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>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, <a class="struct" href="../../rand/struct.Error.html" title="struct rand::Error">Error</a>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/rand/rngs/jitter.rs.html#852-854' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Fill <code>dest</code> entirely with random data. <a href="../../rand/trait.RngCore.html#tymethod.try_fill_bytes">Read more</a></p>
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</div></div><h3 id='impl-CryptoRng' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="../../rand/trait.CryptoRng.html" title="trait rand::CryptoRng">CryptoRng</a> for <a class="struct" href="../../rand/rngs/struct.JitterRng.html" title="struct rand::rngs::JitterRng">JitterRng</a></code><a href='#impl-CryptoRng' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/rand/rngs/jitter.rs.html#857' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'></div></div><h2 id='synthetic-implementations' class='small-section-header'>Auto Trait Implementations<a href='#synthetic-implementations' class='anchor'></a></h2><div id='synthetic-implementations-list'><h3 id='impl-Send' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="../../rand/rngs/struct.JitterRng.html" title="struct rand::rngs::JitterRng">JitterRng</a></code><a href='#impl-Send' class='anchor'></a></span></td><td><span class='out-of-band'></span></td></tr></tbody></table></h3><div class='impl-items'></div><h3 id='impl-Sync' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="../../rand/rngs/struct.JitterRng.html" title="struct rand::rngs::JitterRng">JitterRng</a></code><a href='#impl-Sync' class='anchor'></a></span></td><td><span class='out-of-band'></span></td></tr></tbody></table></h3><div class='impl-items'></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><kbd>?</kbd></dt><dd>Show this help dialog</dd><dt><kbd>S</kbd></dt><dd>Focus the search field</dd><dt><kbd>↑</kbd></dt><dd>Move up in search results</dd><dt><kbd>↓</kbd></dt><dd>Move down in search results</dd><dt><kbd>↹</kbd></dt><dd>Switch tab</dd><dt><kbd>⏎</kbd></dt><dd>Go to active search result</dd><dt><kbd>+</kbd></dt><dd>Expand all sections</dd><dt><kbd>-</kbd></dt><dd>Collapse 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><p>Search multiple things at once by splitting your query with comma (e.g. <code>str,u8</code> or <code>String,struct:Vec,test</code>)</p></div></div></aside><script>window.rootPath = "../../";window.currentCrate = "rand";</script><script src="../../aliases.js"></script><script src="../../main.js"></script><script defer src="../../search-index.js"></script></body></html> |