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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 `CryptoRng` trait in crate `rand`."><meta name="keywords" content="rust, rustlang, rust-lang, CryptoRng"><title>rand::CryptoRng - 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 trait"><!--[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'>Trait CryptoRng</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#foreign-impls">Implementations on Foreign Types</a><div class="sidebar-links"><a href="#impl-CryptoRng">Box<R></a><a href="#impl-CryptoRng">BlockRng<R></a><a href="#impl-CryptoRng">&'a mut R</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='index.html'>rand</a></p><script>window.sidebarCurrent = {name: 'CryptoRng', ty: 'trait', 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'>Trait <a href='index.html'>rand</a>::<wbr><a class="trait" href=''>CryptoRng</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_core/lib.rs.html#218' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class='rust trait'>pub trait CryptoRng { }</pre></div><div class='docblock'><p>A marker trait used to indicate that an <a href="trait.RngCore.html"><code>RngCore</code></a> or <a href="../rand_core/block/trait.BlockRngCore.html"><code>BlockRngCore</code></a>
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implementation is supposed to be cryptographically secure.</p>
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<p><em>Cryptographically secure generators</em>, also known as <em>CSPRNGs</em>, should
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satisfy an additional properties over other generators: given the first
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<em>k</em> bits of an algorithm's output
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sequence, it should not be possible using polynomial-time algorithms to
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predict the next bit with probability significantly greater than 50%.</p>
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<p>Some generators may satisfy an additional property, however this is not
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required by this trait: if the CSPRNG's state is revealed, it should not be
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computationally-feasible to reconstruct output prior to this. Some other
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generators allow backwards-computation and are consided <em>reversible</em>.</p>
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<p>Note that this trait is provided for guidance only and cannot guarantee
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suitability for cryptographic applications. In general it should only be
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implemented for well-reviewed code implementing well-regarded algorithms.</p>
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<p>Note also that use of a <code>CryptoRng</code> does not protect against other
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weaknesses such as seeding from a weak entropy source or leaking state.</p>
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</div>
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<h2 id='foreign-impls' class='small-section-header'>
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Implementations on Foreign Types<a href='#foreign-impls' class='anchor'></a>
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</h2>
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<h3 id='impl-CryptoRng' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<R> <a class="trait" href="../rand/trait.CryptoRng.html" title="trait rand::CryptoRng">CryptoRng</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a><R> <span class="where fmt-newline">where<br> R: <a class="trait" href="../rand/trait.CryptoRng.html" title="trait rand::CryptoRng">CryptoRng</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></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_core/lib.rs.html#443' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><span class='docblock autohide'><div class='impl-items'></div></span><h3 id='impl-CryptoRng-1' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<R> <a class="trait" href="../rand/trait.CryptoRng.html" title="trait rand::CryptoRng">CryptoRng</a> for <a class="struct" href="../rand_core/block/struct.BlockRng.html" title="struct rand_core::block::BlockRng">BlockRng</a><R> <span class="where fmt-newline">where<br> R: <a class="trait" href="../rand_core/block/trait.BlockRngCore.html" title="trait rand_core::block::BlockRngCore">BlockRngCore</a> + <a class="trait" href="../rand/trait.CryptoRng.html" title="trait rand::CryptoRng">CryptoRng</a>, </span></code><a href='#impl-CryptoRng-1' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand_core/block.rs.html#508' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><span class='docblock autohide'><div class='impl-items'></div></span><h3 id='impl-CryptoRng-2' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<'a, R> <a class="trait" href="../rand/trait.CryptoRng.html" title="trait rand::CryptoRng">CryptoRng</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'a mut </a>R <span class="where fmt-newline">where<br> R: <a class="trait" href="../rand/trait.CryptoRng.html" title="trait rand::CryptoRng">CryptoRng</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></code><a href='#impl-CryptoRng-2' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand_core/lib.rs.html#439' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><span class='docblock autohide'><div class='impl-items'></div></span><h2 id='implementors' class='small-section-header'>Implementors<a href='#implementors' class='anchor'></a></h2><ul class='item-list' id='implementors-list'><li><table class='table-display'><tbody><tr><td><code>impl CryptoRng for <a class="struct" href="../rand/prng/chacha/struct.ChaChaRng.html" title="struct rand::prng::chacha::ChaChaRng">ChaChaRng</a></code><td><div class='out-of-band'><a class='srclink' href='../src/rand/prng/chacha.rs.html#107' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
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<li><table class='table-display'><tbody><tr><td><code>impl CryptoRng for <a class="struct" href="../rand/prng/chacha/struct.ChaChaCore.html" title="struct rand::prng::chacha::ChaChaCore">ChaChaCore</a></code><td><div class='out-of-band'><a class='srclink' href='../src/rand/prng/chacha.rs.html#289' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
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<li><table class='table-display'><tbody><tr><td><code>impl CryptoRng for <a class="struct" href="../rand/prng/hc128/struct.Hc128Rng.html" title="struct rand::prng::hc128::Hc128Rng">Hc128Rng</a></code><td><div class='out-of-band'><a class='srclink' href='../src/rand/prng/hc128.rs.html#106' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
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<li><table class='table-display'><tbody><tr><td><code>impl CryptoRng for <a class="struct" href="../rand/prng/hc128/struct.Hc128Core.html" title="struct rand::prng::hc128::Hc128Core">Hc128Core</a></code><td><div class='out-of-band'><a class='srclink' href='../src/rand/prng/hc128.rs.html#335' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
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<li><table class='table-display'><tbody><tr><td><code>impl<R, Rsdr> CryptoRng for <a class="struct" href="../rand/rngs/adapter/struct.ReseedingRng.html" title="struct rand::rngs::adapter::ReseedingRng">ReseedingRng</a><R, Rsdr> <span class="where fmt-newline">where<br> R: <a class="trait" href="../rand_core/block/trait.BlockRngCore.html" title="trait rand_core::block::BlockRngCore">BlockRngCore</a> + <a class="trait" href="../rand/trait.SeedableRng.html" title="trait rand::SeedableRng">SeedableRng</a> + <a class="trait" href="../rand/trait.CryptoRng.html" title="trait rand::CryptoRng">CryptoRng</a>,<br> Rsdr: <a class="trait" href="../rand/trait.RngCore.html" title="trait rand::RngCore">RngCore</a> + <a class="trait" href="../rand/trait.CryptoRng.html" title="trait rand::CryptoRng">CryptoRng</a>, </span></code><td><div class='out-of-band'><a class='srclink' href='../src/rand/rngs/adapter/reseeding.rs.html#119-121' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
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<li><table class='table-display'><tbody><tr><td><code>impl CryptoRng for <a class="struct" href="../rand/rngs/struct.EntropyRng.html" title="struct rand::rngs::EntropyRng">EntropyRng</a></code><td><div class='out-of-band'><a class='srclink' href='../src/rand/rngs/entropy.rs.html#165' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
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<li><table class='table-display'><tbody><tr><td><code>impl CryptoRng for <a class="struct" href="../rand/rngs/struct.JitterRng.html" title="struct rand::rngs::JitterRng">JitterRng</a></code><td><div class='out-of-band'><a class='srclink' href='../src/rand/rngs/jitter.rs.html#857' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
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<li><table class='table-display'><tbody><tr><td><code>impl CryptoRng for <a class="struct" href="../rand/rngs/struct.StdRng.html" title="struct rand::rngs::StdRng">StdRng</a></code><td><div class='out-of-band'><a class='srclink' href='../src/rand/rngs/std.rs.html#65' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
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<li><table class='table-display'><tbody><tr><td><code>impl CryptoRng for <a class="struct" href="../rand/rngs/struct.ThreadRng.html" title="struct rand::rngs::ThreadRng">ThreadRng</a></code><td><div class='out-of-band'><a class='srclink' href='../src/rand/rngs/thread.rs.html#124' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
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<li><table class='table-display'><tbody><tr><td><code>impl CryptoRng for <a class="struct" href="../rand/rngs/struct.OsRng.html" title="struct rand::rngs::OsRng">OsRng</a></code><td><div class='out-of-band'><a class='srclink' href='../src/rand/rngs/os.rs.html#133' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
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