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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="Random number generation traits"><title>rand_core - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="rand_core" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../static.files/storage-e2aeef58.js"></script><script defer src="../crates.js"></script><script defer src="../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-263c88ec.css"></noscript><link rel="icon" href="https://www.rust-lang.org/favicon.ico"></head><body class="rustdoc mod crate"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><rustdoc-topbar><h2><a href="#">Crate rand_core</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><a class="logo-container" href="../rand_core/index.html"><img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt="logo"></a><h2><a href="../rand_core/index.html">rand_<wbr>core</a><span class="version">0.9.5</span></h2></div><div class="sidebar-elems"><ul class="block"><li><a id="all-types" href="all.html">All Items</a></li></ul><section id="rustdoc-toc"><h3><a href="#modules">Crate Items</a></h3><ul class="block"><li><a href="#modules" title="Modules">Modules</a></li><li><a href="#structs" title="Structs">Structs</a></li><li><a href="#traits" title="Traits">Traits</a></li></ul></section><div id="rustdoc-modnav"></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><section id="main-content" class="content"><div class="main-heading"><h1>Crate <span>rand_<wbr>core</span>&nbsp;<button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../src/rand_core/lib.rs.html#10-771">Source</a> </span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Random number generation traits</p>
<p>This crate is mainly of interest to crates publishing implementations of
<a href="trait.RngCore.html" title="trait rand_core::RngCore"><code>RngCore</code></a>. Other users are encouraged to use the <a href="https://docs.rs/rand"><code>rand</code></a> crate instead
which re-exports the main traits and error types.</p>
<p><a href="trait.RngCore.html" title="trait rand_core::RngCore"><code>RngCore</code></a> is the core trait implemented by algorithmic pseudo-random number
generators and external random-number sources.</p>
<p><a href="trait.SeedableRng.html" title="trait rand_core::SeedableRng"><code>SeedableRng</code></a> is an extension trait for construction from fixed seeds and
other random number generators.</p>
<p>The <a href="impls/index.html" title="mod rand_core::impls"><code>impls</code></a> and <a href="le/index.html" title="mod rand_core::le"><code>le</code></a> sub-modules include a few small functions to assist
implementation of <a href="trait.RngCore.html" title="trait rand_core::RngCore"><code>RngCore</code></a>.</p>
</div></details><h2 id="modules" class="section-header">Modules<a href="#modules" class="anchor">§</a></h2><dl class="item-table"><dt><a class="mod" href="block/index.html" title="mod rand_core::block">block</a></dt><dd>The <code>BlockRngCore</code> trait and implementation helpers</dd><dt><a class="mod" href="impls/index.html" title="mod rand_core::impls">impls</a></dt><dd>Helper functions for implementing <code>RngCore</code> functions.</dd><dt><a class="mod" href="le/index.html" title="mod rand_core::le">le</a></dt><dd>Little-Endian utilities</dd></dl><h2 id="structs" class="section-header">Structs<a href="#structs" class="anchor">§</a></h2><dl class="item-table"><dt><a class="struct" href="struct.OsError.html" title="struct rand_core::OsError">OsError</a></dt><dd>Error type of <a href="struct.OsRng.html" title="struct rand_core::OsRng"><code>OsRng</code></a></dd><dt><a class="struct" href="struct.OsRng.html" title="struct rand_core::OsRng">OsRng</a></dt><dd>An interface over the operating-systems random data source</dd><dt><a class="struct" href="struct.RngReadAdapter.html" title="struct rand_core::RngReadAdapter">RngRead<wbr>Adapter</a></dt><dd>Adapter that enables reading through a <a href="https://doc.rust-lang.org/1.93.1/std/io/trait.Read.html" title="trait std::io::Read"><code>io::Read</code></a> from a <a href="trait.RngCore.html" title="trait rand_core::RngCore"><code>RngCore</code></a>.</dd><dt><a class="struct" href="struct.UnwrapErr.html" title="struct rand_core::UnwrapErr">Unwrap<wbr>Err</a></dt><dd>Wrapper around <a href="trait.TryRngCore.html" title="trait rand_core::TryRngCore"><code>TryRngCore</code></a> implementation which implements <a href="trait.RngCore.html" title="trait rand_core::RngCore"><code>RngCore</code></a>
by panicking on potential errors.</dd><dt><a class="struct" href="struct.UnwrapMut.html" title="struct rand_core::UnwrapMut">Unwrap<wbr>Mut</a></dt><dd>Wrapper around <a href="trait.TryRngCore.html" title="trait rand_core::TryRngCore"><code>TryRngCore</code></a> implementation which implements <a href="trait.RngCore.html" title="trait rand_core::RngCore"><code>RngCore</code></a>
by panicking on potential errors.</dd></dl><h2 id="traits" class="section-header">Traits<a href="#traits" class="anchor">§</a></h2><dl class="item-table"><dt><a class="trait" href="trait.CryptoRng.html" title="trait rand_core::CryptoRng">Crypto<wbr>Rng</a></dt><dd>A marker trait over <a href="trait.RngCore.html" title="trait rand_core::RngCore"><code>RngCore</code></a> for securely unpredictable RNGs</dd><dt><a class="trait" href="trait.RngCore.html" title="trait rand_core::RngCore">RngCore</a></dt><dd>Implementation-level interface for RNGs</dd><dt><a class="trait" href="trait.SeedableRng.html" title="trait rand_core::SeedableRng">Seedable<wbr>Rng</a></dt><dd>A random number generator that can be explicitly seeded.</dd><dt><a class="trait" href="trait.TryCryptoRng.html" title="trait rand_core::TryCryptoRng">TryCrypto<wbr>Rng</a></dt><dd>A marker trait over <a href="trait.TryRngCore.html" title="trait rand_core::TryRngCore"><code>TryRngCore</code></a> for securely unpredictable RNGs</dd><dt><a class="trait" href="trait.TryRngCore.html" title="trait rand_core::TryRngCore">TryRng<wbr>Core</a></dt><dd>A potentially fallible variant of <a href="trait.RngCore.html" title="trait rand_core::RngCore"><code>RngCore</code></a></dd></dl></section></div></main></body></html>