| <!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_core - 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">Trait CryptoRng</h2><div class="sidebar-elems"><div class="block items"><h3 class="sidebar-title"><a href="#foreign-impls">Implementations on Foreign Types</a></h3><div class="sidebar-links"><a href="#impl-CryptoRng-for-%26%27a%20mut%20R">&'a mut R</a><a href="#impl-CryptoRng-for-Box%3CR%3E">Box<R></a></div><h3 class="sidebar-title"><a href="#implementors">Implementors</a></h3></div><h2 class="location">Other items in<br><a href="index.html">rand_core</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_core/index.html"><img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt="logo"></a><nav class="sub"><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../brush.svg"></button><div id="theme-choices" role="menu"></div></div><form class="search-form"><div class="search-container"><div> |
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| <h1 class="fqn"><span class="in-band">Trait <a href="index.html">rand_core</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"> |
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| <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="block/trait.BlockRngCore.html"><code>BlockRngCore</code></a> |
| implementation is supposed to be cryptographically secure.</p> |
| <p><em>Cryptographically secure generators</em>, also known as <em>CSPRNGs</em>, should |
| satisfy an additional properties over other generators: given the first |
| <em>k</em> bits of an algorithm’s output |
| sequence, it should not be possible using polynomial-time algorithms to |
| predict the next bit with probability significantly greater than 50%.</p> |
| <p>Some generators may satisfy an additional property, however this is not |
| required by this trait: if the CSPRNG’s state is revealed, it should not be |
| computationally-feasible to reconstruct output prior to this. Some other |
| generators allow backwards-computation and are considered <em>reversible</em>.</p> |
| <p>Note that this trait is provided for guidance only and cannot guarantee |
| suitability for cryptographic applications. In general it should only be |
| implemented for well-reviewed code implementing well-regarded algorithms.</p> |
| <p>Note also that use of a <code>CryptoRng</code> does not protect against other |
| weaknesses such as seeding from a weak entropy source or leaking state.</p> |
| </div></details><h2 id="foreign-impls" class="small-section-header">Implementations on Foreign Types<a href="#foreign-impls" class="anchor"></a></h2><div id="impl-CryptoRng-for-%26%27a%20mut%20R" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../src/rand_core/lib.rs.html#481" title="goto source code">source</a></div><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_core::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>> <a class="trait" href="trait.CryptoRng.html" title="trait rand_core::CryptoRng">CryptoRng</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'a mut </a>R</h3></div><div id="impl-CryptoRng-for-Box%3CR%3E" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../src/rand_core/lib.rs.html#485" title="goto source code">source</a></div><a href="#impl-CryptoRng-for-Box%3CR%3E" class="anchor"></a><h3 class="code-header in-band">impl<R: <a class="trait" href="trait.CryptoRng.html" title="trait rand_core::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>> <a class="trait" href="trait.CryptoRng.html" title="trait rand_core::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></h3></div><h2 id="implementors" class="small-section-header">Implementors<a href="#implementors" class="anchor"></a></h2><div class="item-list" id="implementors-list"><div id="impl-CryptoRng" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../src/rand_core/os.rs.html#50" title="goto source code">source</a></div><a href="#impl-CryptoRng" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="trait.CryptoRng.html" title="trait rand_core::CryptoRng">CryptoRng</a> for <a class="struct" href="struct.OsRng.html" title="struct rand_core::OsRng">OsRng</a></h3></div><div id="impl-CryptoRng-1" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../src/rand_core/block.rs.html#431" title="goto source code">source</a></div><a href="#impl-CryptoRng-1" class="anchor"></a><h3 class="code-header in-band">impl<R: <a class="trait" href="block/trait.BlockRngCore.html" title="trait rand_core::block::BlockRngCore">BlockRngCore</a> + <a class="trait" href="trait.CryptoRng.html" title="trait rand_core::CryptoRng">CryptoRng</a>> <a class="trait" href="trait.CryptoRng.html" title="trait rand_core::CryptoRng">CryptoRng</a> for <a class="struct" href="block/struct.BlockRng.html" title="struct rand_core::block::BlockRng">BlockRng</a><R></h3></div></div><script type="text/javascript" src="../implementors/rand_core/trait.CryptoRng.js" async></script></section><section id="search" class="content hidden"></section></div></main><div id="rustdoc-vars" data-root-path="../" data-current-crate="rand_core" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.60.0-nightly (1bd4fdc94 2022-01-12)" ></div> |
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