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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="A marker trait used to indicate that an [`RngCore`] or `BlockRngCore` implementation is supposed to be cryptographically secure."><meta name="keywords" content="rust, rustlang, rust-lang, CryptoRng"><title>CryptoRng in rand - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Semibold.ttf.woff2"><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="../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../dark.css" disabled><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../storage.js"></script><script src="../crates.js"></script><script defer src="../main.js"></script>
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</a><h2 class="location"><a href="#">CryptoRng</a></h2><div class="sidebar-elems"><section><div class="block"><h3 class="sidebar-title"><a href="#foreign-impls">Implementations on Foreign Types</a></h3><ul><li><a href="#impl-CryptoRng-for-%26%27a%20mut%20R">&'a mut R</a></li><li><a href="#impl-CryptoRng-for-BlockRng%3CR%3E">BlockRng<R></a></li><li><a href="#impl-CryptoRng-for-Box%3CR%2C%20Global%3E">Box<R, Global></a></li><li><a href="#impl-CryptoRng-for-ChaCha12Core">ChaCha12Core</a></li><li><a href="#impl-CryptoRng-for-ChaCha12Rng">ChaCha12Rng</a></li><li><a href="#impl-CryptoRng-for-ChaCha20Core">ChaCha20Core</a></li><li><a href="#impl-CryptoRng-for-ChaCha20Rng">ChaCha20Rng</a></li><li><a href="#impl-CryptoRng-for-ChaCha8Core">ChaCha8Core</a></li><li><a href="#impl-CryptoRng-for-ChaCha8Rng">ChaCha8Rng</a></li></ul></div><div class="block"><h3 class="sidebar-title"><a href="#implementors">Implementors</a></h3></div></section><h2 class="location"><a href="index.html">In rand</a></h2><div id="sidebar-vars" data-name="CryptoRng" data-ty="trait" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../rand/index.html">
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<h1 class="fqn"><span class="in-band">Trait <a href="index.html">rand</a>::<wbr><a class="trait" href="#">CryptoRng</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"><a class="srclink" href="../src/rand_core/lib.rs.html#209">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span></div><div class="docblock item-decl"><pre class="rust trait"><code>pub trait CryptoRng { }</code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A marker trait used to indicate that an <a href="trait.RngCore.html" title="RngCore"><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></details><h2 id="foreign-impls" class="small-section-header">Implementations on Foreign Types<a href="#foreign-impls" class="anchor"></a></h2><section id="impl-CryptoRng-for-BlockRng%3CR%3E" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../src/rand_core/block.rs.html#437">source</a></span><a href="#impl-CryptoRng-for-BlockRng%3CR%3E" class="anchor"></a><h3 class="code-header in-band">impl<R> <a class="trait" href="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="trait.CryptoRng.html" title="trait rand::CryptoRng">CryptoRng</a>, </span></h3></section><section id="impl-CryptoRng-for-Box%3CR%2C%20Global%3E" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../src/rand_core/lib.rs.html#456">source</a></span><a href="#impl-CryptoRng-for-Box%3CR%2C%20Global%3E" class="anchor"></a><h3 class="code-header in-band">impl<R> <a class="trait" href="trait.CryptoRng.html" title="trait rand::CryptoRng">CryptoRng</a> for <a class="struct" href="https://doc.rust-lang.org/1.62.1/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a><R, <a class="struct" href="https://doc.rust-lang.org/1.62.1/alloc/alloc/struct.Global.html" title="struct alloc::alloc::Global">Global</a>> <span class="where fmt-newline">where<br> R: <a class="trait" href="trait.CryptoRng.html" title="trait rand::CryptoRng">CryptoRng</a> + ?<a class="trait" href="https://doc.rust-lang.org/1.62.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></h3></section><section id="impl-CryptoRng-for-%26%27a%20mut%20R" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../src/rand_core/lib.rs.html#452">source</a></span><a href="#impl-CryptoRng-for-%26%27a%20mut%20R" class="anchor"></a><h3 class="code-header in-band">impl<'a, R> <a class="trait" href="trait.CryptoRng.html" title="trait rand::CryptoRng">CryptoRng</a> for <a class="primitive" href="https://doc.rust-lang.org/1.62.1/std/primitive.reference.html">&'a mut </a>R <span class="where fmt-newline">where<br> R: <a class="trait" href="trait.CryptoRng.html" title="trait rand::CryptoRng">CryptoRng</a> + ?<a class="trait" href="https://doc.rust-lang.org/1.62.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></h3></section><section id="impl-CryptoRng-for-ChaCha8Rng" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../src/rand_chacha/chacha.rs.html#345">source</a></span><a href="#impl-CryptoRng-for-ChaCha8Rng" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="trait.CryptoRng.html" title="trait rand::CryptoRng">CryptoRng</a> for <a class="struct" href="../rand_chacha/chacha/struct.ChaCha8Rng.html" title="struct rand_chacha::chacha::ChaCha8Rng">ChaCha8Rng</a></h3></section><section id="impl-CryptoRng-for-ChaCha12Rng" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../src/rand_chacha/chacha.rs.html#344">source</a></span><a href="#impl-CryptoRng-for-ChaCha12Rng" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="trait.CryptoRng.html" title="trait rand::CryptoRng">CryptoRng</a> for <a class="struct" href="../rand_chacha/chacha/struct.ChaCha12Rng.html" title="struct rand_chacha::chacha::ChaCha12Rng">ChaCha12Rng</a></h3></section><section id="impl-CryptoRng-for-ChaCha12Core" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../src/rand_chacha/chacha.rs.html#344">source</a></span><a href="#impl-CryptoRng-for-ChaCha12Core" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="trait.CryptoRng.html" title="trait rand::CryptoRng">CryptoRng</a> for <a class="struct" href="../rand_chacha/chacha/struct.ChaCha12Core.html" title="struct rand_chacha::chacha::ChaCha12Core">ChaCha12Core</a></h3></section><section id="impl-CryptoRng-for-ChaCha20Core" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../src/rand_chacha/chacha.rs.html#343">source</a></span><a href="#impl-CryptoRng-for-ChaCha20Core" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="trait.CryptoRng.html" title="trait rand::CryptoRng">CryptoRng</a> for <a class="struct" href="../rand_chacha/chacha/struct.ChaCha20Core.html" title="struct rand_chacha::chacha::ChaCha20Core">ChaCha20Core</a></h3></section><section id="impl-CryptoRng-for-ChaCha8Core" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../src/rand_chacha/chacha.rs.html#345">source</a></span><a href="#impl-CryptoRng-for-ChaCha8Core" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="trait.CryptoRng.html" title="trait rand::CryptoRng">CryptoRng</a> for <a class="struct" href="../rand_chacha/chacha/struct.ChaCha8Core.html" title="struct rand_chacha::chacha::ChaCha8Core">ChaCha8Core</a></h3></section><section id="impl-CryptoRng-for-ChaCha20Rng" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../src/rand_chacha/chacha.rs.html#343">source</a></span><a href="#impl-CryptoRng-for-ChaCha20Rng" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="trait.CryptoRng.html" title="trait rand::CryptoRng">CryptoRng</a> for <a class="struct" href="../rand_chacha/chacha/struct.ChaCha20Rng.html" title="struct rand_chacha::chacha::ChaCha20Rng">ChaCha20Rng</a></h3></section><h2 id="implementors" class="small-section-header">Implementors<a href="#implementors" class="anchor"></a></h2><div class="item-list" id="implementors-list"><section id="impl-CryptoRng" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../src/rand_core/os.rs.html#50">source</a></span><a href="#impl-CryptoRng" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="trait.CryptoRng.html" title="trait rand::CryptoRng">CryptoRng</a> for <a class="struct" href="rngs/struct.OsRng.html" title="struct rand::rngs::OsRng">OsRng</a></h3></section><section id="impl-CryptoRng-1" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../src/rand/rngs/std.rs.html#72">source</a></span><a href="#impl-CryptoRng-1" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="trait.CryptoRng.html" title="trait rand::CryptoRng">CryptoRng</a> for <a class="struct" href="rngs/struct.StdRng.html" title="struct rand::rngs::StdRng">StdRng</a></h3></section><section id="impl-CryptoRng-2" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../src/rand/rngs/thread.rs.html#131">source</a></span><a href="#impl-CryptoRng-2" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="trait.CryptoRng.html" title="trait rand::CryptoRng">CryptoRng</a> for <a class="struct" href="rngs/struct.ThreadRng.html" title="struct rand::rngs::ThreadRng">ThreadRng</a></h3></section><section id="impl-CryptoRng-3" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../src/rand/rngs/adapter/reseeding.rs.html#149-154">source</a></span><a href="#impl-CryptoRng-3" class="anchor"></a><h3 class="code-header in-band">impl<R, Rsdr> <a class="trait" href="trait.CryptoRng.html" title="trait rand::CryptoRng">CryptoRng</a> for <a class="struct" href="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="trait.SeedableRng.html" title="trait rand::SeedableRng">SeedableRng</a> + <a class="trait" href="trait.CryptoRng.html" title="trait rand::CryptoRng">CryptoRng</a>,<br> Rsdr: <a class="trait" href="trait.RngCore.html" title="trait rand::RngCore">RngCore</a> + <a class="trait" href="trait.CryptoRng.html" title="trait rand::CryptoRng">CryptoRng</a>, </span></h3></section></div><script type="text/javascript" src="../implementors/rand_core/trait.CryptoRng.js" data-ignore-extern-crates="rand_core,alloc,rand_chacha" async></script></section></div></main><div id="rustdoc-vars" data-root-path="../" data-current-crate="rand" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.62.1 (e092d0b6b 2022-07-16)" ></div>
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