| <!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="Source of the Rust file `/root/.cargo/git/checkouts/incubator-teaclave-crates-c8106113f74feefc/ede1f68/rand/src/rngs/std.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>std.rs - source</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" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="icon" href="https://www.rust-lang.org/favicon.ico"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../rand/index.html"><div class="logo-container"> |
| <img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../rand/index.html"> |
| <img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
| <span id="2">2</span> |
| <span id="3">3</span> |
| <span id="4">4</span> |
| <span id="5">5</span> |
| <span id="6">6</span> |
| <span id="7">7</span> |
| <span id="8">8</span> |
| <span id="9">9</span> |
| <span id="10">10</span> |
| <span id="11">11</span> |
| <span id="12">12</span> |
| <span id="13">13</span> |
| <span id="14">14</span> |
| <span id="15">15</span> |
| <span id="16">16</span> |
| <span id="17">17</span> |
| <span id="18">18</span> |
| <span id="19">19</span> |
| <span id="20">20</span> |
| <span id="21">21</span> |
| <span id="22">22</span> |
| <span id="23">23</span> |
| <span id="24">24</span> |
| <span id="25">25</span> |
| <span id="26">26</span> |
| <span id="27">27</span> |
| <span id="28">28</span> |
| <span id="29">29</span> |
| <span id="30">30</span> |
| <span id="31">31</span> |
| <span id="32">32</span> |
| <span id="33">33</span> |
| <span id="34">34</span> |
| <span id="35">35</span> |
| <span id="36">36</span> |
| <span id="37">37</span> |
| <span id="38">38</span> |
| <span id="39">39</span> |
| <span id="40">40</span> |
| <span id="41">41</span> |
| <span id="42">42</span> |
| <span id="43">43</span> |
| <span id="44">44</span> |
| <span id="45">45</span> |
| <span id="46">46</span> |
| <span id="47">47</span> |
| <span id="48">48</span> |
| <span id="49">49</span> |
| <span id="50">50</span> |
| <span id="51">51</span> |
| <span id="52">52</span> |
| <span id="53">53</span> |
| <span id="54">54</span> |
| <span id="55">55</span> |
| <span id="56">56</span> |
| <span id="57">57</span> |
| <span id="58">58</span> |
| <span id="59">59</span> |
| <span id="60">60</span> |
| <span id="61">61</span> |
| <span id="62">62</span> |
| <span id="63">63</span> |
| <span id="64">64</span> |
| <span id="65">65</span> |
| <span id="66">66</span> |
| <span id="67">67</span> |
| <span id="68">68</span> |
| <span id="69">69</span> |
| <span id="70">70</span> |
| <span id="71">71</span> |
| <span id="72">72</span> |
| <span id="73">73</span> |
| <span id="74">74</span> |
| <span id="75">75</span> |
| <span id="76">76</span> |
| <span id="77">77</span> |
| <span id="78">78</span> |
| <span id="79">79</span> |
| <span id="80">80</span> |
| <span id="81">81</span> |
| <span id="82">82</span> |
| <span id="83">83</span> |
| <span id="84">84</span> |
| <span id="85">85</span> |
| <span id="86">86</span> |
| <span id="87">87</span> |
| <span id="88">88</span> |
| <span id="89">89</span> |
| <span id="90">90</span> |
| <span id="91">91</span> |
| <span id="92">92</span> |
| <span id="93">93</span> |
| <span id="94">94</span> |
| <span id="95">95</span> |
| <span id="96">96</span> |
| <span id="97">97</span> |
| <span id="98">98</span> |
| </pre><pre class="rust"><code><span class="comment">// Copyright 2018 Developers of the Rand project. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // https://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| </span><span class="doccomment">//! The standard RNG |
| |
| </span><span class="kw">use crate</span>::{CryptoRng, Error, RngCore, SeedableRng}; |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use </span>rand_chacha::ChaCha12Core <span class="kw">as </span>Core; |
| |
| <span class="kw">use </span>rand_chacha::ChaCha12Rng <span class="kw">as </span>Rng; |
| |
| <span class="doccomment">/// The standard RNG. The PRNG algorithm in `StdRng` is chosen to be efficient |
| /// on the current platform, to be statistically strong and unpredictable |
| /// (meaning a cryptographically secure PRNG). |
| /// |
| /// The current algorithm used is the ChaCha block cipher with 12 rounds. Please |
| /// see this relevant [rand issue] for the discussion. This may change as new |
| /// evidence of cipher security and performance becomes available. |
| /// |
| /// The algorithm is deterministic but should not be considered reproducible |
| /// due to dependence on configuration and possible replacement in future |
| /// library versions. For a secure reproducible generator, we recommend use of |
| /// the [rand_chacha] crate directly. |
| /// |
| /// [rand_chacha]: https://crates.io/crates/rand_chacha |
| /// [rand issue]: https://github.com/rust-random/rand/issues/932 |
| </span><span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"std_rng"</span>)))] |
| #[derive(Clone, Debug, PartialEq, Eq)] |
| </span><span class="kw">pub struct </span>StdRng(Rng); |
| |
| <span class="kw">impl </span>RngCore <span class="kw">for </span>StdRng { |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">fn </span>next_u32(<span class="kw-2">&mut </span><span class="self">self</span>) -> u32 { |
| <span class="self">self</span>.<span class="number">0</span>.next_u32() |
| } |
| |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">fn </span>next_u64(<span class="kw-2">&mut </span><span class="self">self</span>) -> u64 { |
| <span class="self">self</span>.<span class="number">0</span>.next_u64() |
| } |
| |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">fn </span>fill_bytes(<span class="kw-2">&mut </span><span class="self">self</span>, dest: <span class="kw-2">&mut </span>[u8]) { |
| <span class="self">self</span>.<span class="number">0</span>.fill_bytes(dest); |
| } |
| |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">fn </span>try_fill_bytes(<span class="kw-2">&mut </span><span class="self">self</span>, dest: <span class="kw-2">&mut </span>[u8]) -> <span class="prelude-ty">Result</span><(), Error> { |
| <span class="self">self</span>.<span class="number">0</span>.try_fill_bytes(dest) |
| } |
| } |
| |
| <span class="kw">impl </span>SeedableRng <span class="kw">for </span>StdRng { |
| <span class="kw">type </span>Seed = <Rng <span class="kw">as </span>SeedableRng>::Seed; |
| |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">fn </span>from_seed(seed: <span class="self">Self</span>::Seed) -> <span class="self">Self </span>{ |
| StdRng(Rng::from_seed(seed)) |
| } |
| |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">fn </span>from_rng<R: RngCore>(rng: R) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, Error> { |
| Rng::from_rng(rng).map(StdRng) |
| } |
| } |
| |
| <span class="kw">impl </span>CryptoRng <span class="kw">for </span>StdRng {} |
| |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>test { |
| <span class="kw">use </span><span class="kw">crate</span>::rngs::StdRng; |
| <span class="kw">use crate</span>::{RngCore, SeedableRng}; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_stdrng_construction() { |
| <span class="comment">// Test value-stability of StdRng. This is expected to break any time |
| // the algorithm is changed. |
| </span><span class="attribute">#[rustfmt::skip] |
| </span><span class="kw">let </span>seed = [<span class="number">1</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>, <span class="number">23</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>, <span class="number">200</span>,<span class="number">1</span>,<span class="number">0</span>,<span class="number">0</span>, <span class="number">210</span>,<span class="number">30</span>,<span class="number">0</span>,<span class="number">0</span>, |
| <span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>, <span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>, <span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>, <span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>]; |
| |
| <span class="kw">let </span>target = [<span class="number">10719222850664546238</span>, <span class="number">14064965282130556830</span>]; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>rng0 = StdRng::from_seed(seed); |
| <span class="kw">let </span>x0 = rng0.next_u64(); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>rng1 = StdRng::from_rng(rng0).unwrap(); |
| <span class="kw">let </span>x1 = rng1.next_u64(); |
| |
| <span class="macro">assert_eq!</span>([x0, x1], target); |
| } |
| } |
| </code></pre></div> |
| </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="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |