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185 lines
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<p class='location'>Struct OsRng</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.new">new</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Rng">Rng</a><a href="#impl-Debug">Debug</a></div></div><p class='location'><a href='index.html'>rand</a></p><script>window.sidebarCurrent = {name: 'OsRng', ty: 'struct', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<section id='main' class="content">
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<h1 class='fqn'><span class='in-band'>Struct <a href='index.html'>rand</a>::<wbr><a class="struct" href=''>OsRng</a></span><span class='out-of-band'><span id='render-detail'>
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<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
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[<span class='inner'>−</span>]
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</a>
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</span><a class='srclink' href='../src/rand/os.rs.html#35' title='goto source code'>[src]</a></span></h1>
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<pre class='rust struct'>pub struct OsRng(_);</pre><div class='docblock'><p>A random number generator that retrieves randomness straight from
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the operating system. Platform sources:</p>
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<ul>
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<li>Unix-like systems (Linux, Android, Mac OSX): read directly from
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<code>/dev/urandom</code>, or from <code>getrandom(2)</code> system call if available.</li>
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<li>OpenBSD: calls <code>getentropy(2)</code></li>
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<li>FreeBSD: uses the <code>kern.arandom</code> <code>sysctl(2)</code> mib</li>
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<li>Windows: calls <code>RtlGenRandom</code>, exported from <code>advapi32.dll</code> as
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<code>SystemFunction036</code>.</li>
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<li>iOS: calls SecRandomCopyBytes as /dev/(u)random is sandboxed.</li>
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<li>PNaCl: calls into the <code>nacl-irt-random-0.1</code> IRT interface.</li>
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</ul>
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<p>This usually does not block. On some systems (e.g. FreeBSD, OpenBSD,
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Max OS X, and modern Linux) this may block very early in the init
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process, if the CSPRNG has not been seeded yet.[1]</p>
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<p>[1] See <a href="https://www.python.org/dev/peps/pep-0524/">https://www.python.org/dev/peps/pep-0524/</a> for a more
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in-depth discussion.</p>
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</div>
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<h2 id='methods' class='small-section-header'>
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Methods<a href='#methods' class='anchor'></a>
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</h2>
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<h3 id='impl' class='impl'><span class='in-band'><code>impl <a class="struct" href="../rand/os/struct.OsRng.html" title="struct rand::os::OsRng">OsRng</a></code><a href='#impl' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand/os.rs.html#37-42' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.new' class="method"><span id='new.v' class='invisible'><code>pub fn <a href='#method.new' class='fnname'>new</a>() -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="struct" href="../rand/os/struct.OsRng.html" title="struct rand::os::OsRng">OsRng</a>, <a class="struct" href="https://doc.rust-lang.org/nightly/std/io/error/struct.Error.html" title="struct std::io::error::Error">Error</a>></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand/os.rs.html#39-41' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Create a new <code>OsRng</code>.</p>
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</div></div>
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<h2 id='implementations' class='small-section-header'>
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Trait Implementations<a href='#implementations' class='anchor'></a>
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</h2>
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<h3 id='impl-Rng' class='impl'><span class='in-band'><code>impl <a class="trait" href="../rand/trait.Rng.html" title="trait rand::Rng">Rng</a> for <a class="struct" href="../rand/os/struct.OsRng.html" title="struct rand::os::OsRng">OsRng</a></code><a href='#impl-Rng' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand/os.rs.html#44-48' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.next_u32' class="method"><span id='next_u32.v' class='invisible'><code>fn <a href='../rand/trait.Rng.html#tymethod.next_u32' class='fnname'>next_u32</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand/os.rs.html#45' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Return the next random u32. <a href="../rand/trait.Rng.html#tymethod.next_u32">Read more</a></p>
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</div><h4 id='method.next_u64' class="method"><span id='next_u64.v' class='invisible'><code>fn <a href='../rand/trait.Rng.html#method.next_u64' class='fnname'>next_u64</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand/os.rs.html#46' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Return the next random u64. <a href="../rand/trait.Rng.html#method.next_u64">Read more</a></p>
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</div><h4 id='method.fill_bytes' class="method"><span id='fill_bytes.v' class='invisible'><code>fn <a href='../rand/trait.Rng.html#method.fill_bytes' class='fnname'>fill_bytes</a>(&mut self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&mut [</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>)</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand/os.rs.html#47' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Fill <code>dest</code> with random data. <a href="../rand/trait.Rng.html#method.fill_bytes">Read more</a></p>
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</div><h4 id='method.next_f32' class="method"><span id='next_f32.v' class='invisible'><code>fn <a href='../rand/trait.Rng.html#method.next_f32' class='fnname'>next_f32</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.f32.html">f32</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand/lib.rs.html#383-389' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Return the next random f32 selected from the half-open interval <code>[0, 1)</code>. <a href="../rand/trait.Rng.html#method.next_f32">Read more</a></p>
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</div><h4 id='method.next_f64' class="method"><span id='next_f64.v' class='invisible'><code>fn <a href='../rand/trait.Rng.html#method.next_f64' class='fnname'>next_f64</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.f64.html">f64</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand/lib.rs.html#401-407' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Return the next random f64 selected from the half-open interval <code>[0, 1)</code>. <a href="../rand/trait.Rng.html#method.next_f64">Read more</a></p>
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</div><h4 id='method.gen' class="method"><span id='gen.v' class='invisible'><code>fn <a href='../rand/trait.Rng.html#method.gen' class='fnname'>gen</a><T>(&mut self) -> T <span class="where fmt-newline">where<br> T: <a class="trait" href="../rand/trait.Rand.html" title="trait rand::Rand">Rand</a>, </span></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand/lib.rs.html#473-475' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Return a random value of a <code>Rand</code> type. <a href="../rand/trait.Rng.html#method.gen">Read more</a></p>
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</div><h4 id='method.gen_iter' class="method"><div class="important-traits"><div class='tooltip'>ⓘ<span class='tooltiptext'>Important traits for <a class="struct" href="../rand/struct.Generator.html" title="struct rand::Generator">Generator</a><'a, T, R></span></div><div class="content hidden"><h3 class="important">Important traits for <a class="struct" href="../rand/struct.Generator.html" title="struct rand::Generator">Generator</a><'a, T, R></h3><code class="content"><span class="where fmt-newline">impl<'a, T, R> <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a> for <a class="struct" href="../rand/struct.Generator.html" title="struct rand::Generator">Generator</a><'a, T, R> <span class="where fmt-newline">where<br> R: <a class="trait" href="../rand/trait.Rng.html" title="trait rand::Rng">Rng</a>,<br> T: <a class="trait" href="../rand/trait.Rand.html" title="trait rand::Rand">Rand</a>, </span></span><span class="where fmt-newline"> type <a href='https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html#associatedtype.Item' class="type">Item</a> = T;</span></code></div></div><span id='gen_iter.v' class='invisible'><code>fn <a href='../rand/trait.Rng.html#method.gen_iter' class='fnname'>gen_iter</a><T>(&'a mut self) -> <a class="struct" href="../rand/struct.Generator.html" title="struct rand::Generator">Generator</a><'a, T, Self> <span class="where fmt-newline">where<br> T: <a class="trait" href="../rand/trait.Rand.html" title="trait rand::Rand">Rand</a>, </span></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand/lib.rs.html#491-493' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Return an iterator that will yield an infinite number of randomly generated items. <a href="../rand/trait.Rng.html#method.gen_iter">Read more</a></p>
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</div><h4 id='method.gen_range' class="method"><span id='gen_range.v' class='invisible'><code>fn <a href='../rand/trait.Rng.html#method.gen_range' class='fnname'>gen_range</a><T>(&mut self, low: T, high: T) -> T <span class="where fmt-newline">where<br> T: <a class="trait" href="../rand/distributions/range/trait.SampleRange.html" title="trait rand::distributions::range::SampleRange">SampleRange</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialOrd.html" title="trait core::cmp::PartialOrd">PartialOrd</a><T>, </span></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand/lib.rs.html#518-521' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Generate a random value in the range [<code>low</code>, <code>high</code>). <a href="../rand/trait.Rng.html#method.gen_range">Read more</a></p>
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</div><h4 id='method.gen_weighted_bool' class="method"><span id='gen_weighted_bool.v' class='invisible'><code>fn <a href='../rand/trait.Rng.html#method.gen_weighted_bool' class='fnname'>gen_weighted_bool</a>(&mut self, n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand/lib.rs.html#533-535' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Return a bool with a 1 in n chance of true <a href="../rand/trait.Rng.html#method.gen_weighted_bool">Read more</a></p>
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</div><h4 id='method.gen_ascii_chars' class="method"><div class="important-traits"><div class='tooltip'>ⓘ<span class='tooltiptext'>Important traits for <a class="struct" href="../rand/struct.AsciiGenerator.html" title="struct rand::AsciiGenerator">AsciiGenerator</a><'a, R></span></div><div class="content hidden"><h3 class="important">Important traits for <a class="struct" href="../rand/struct.AsciiGenerator.html" title="struct rand::AsciiGenerator">AsciiGenerator</a><'a, R></h3><code class="content"><span class="where fmt-newline">impl<'a, R> <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a> for <a class="struct" href="../rand/struct.AsciiGenerator.html" title="struct rand::AsciiGenerator">AsciiGenerator</a><'a, R> <span class="where fmt-newline">where<br> R: <a class="trait" href="../rand/trait.Rng.html" title="trait rand::Rng">Rng</a>, </span></span><span class="where fmt-newline"> type <a href='https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html#associatedtype.Item' class="type">Item</a> = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.char.html">char</a>;</span></code></div></div><span id='gen_ascii_chars.v' class='invisible'><code>fn <a href='../rand/trait.Rng.html#method.gen_ascii_chars' class='fnname'>gen_ascii_chars</a>(&'a mut self) -> <a class="struct" href="../rand/struct.AsciiGenerator.html" title="struct rand::AsciiGenerator">AsciiGenerator</a><'a, Self></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand/lib.rs.html#547-549' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Return an iterator of random characters from the set A-Z,a-z,0-9. <a href="../rand/trait.Rng.html#method.gen_ascii_chars">Read more</a></p>
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</div><h4 id='method.choose' class="method"><span id='choose.v' class='invisible'><code>fn <a href='../rand/trait.Rng.html#method.choose' class='fnname'>choose</a><T>(&mut self, values: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&'a [T]</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'a </a>T></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand/lib.rs.html#565-571' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Return a random element from <code>values</code>. <a href="../rand/trait.Rng.html#method.choose">Read more</a></p>
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</div><h4 id='method.choose_mut' class="method"><span id='choose_mut.v' class='invisible'><code>fn <a href='../rand/trait.Rng.html#method.choose_mut' class='fnname'>choose_mut</a><T>(&mut self, values: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&'a mut [T]</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'a mut </a>T></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand/lib.rs.html#576-583' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Return a mutable pointer to a random element from <code>values</code>. <a href="../rand/trait.Rng.html#method.choose_mut">Read more</a></p>
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</div><h4 id='method.shuffle' class="method"><span id='shuffle.v' class='invisible'><code>fn <a href='../rand/trait.Rng.html#method.shuffle' class='fnname'>shuffle</a><T>(&mut self, values: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&mut [T]</a>)</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand/lib.rs.html#602-610' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Shuffle a mutable slice in place. <a href="../rand/trait.Rng.html#method.shuffle">Read more</a></p>
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</div></div><h3 id='impl-Debug' class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="../rand/os/struct.OsRng.html" title="struct rand::os::OsRng">OsRng</a></code><a href='#impl-Debug' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand/os.rs.html#50-54' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.fmt' class="method"><span id='fmt.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&self, f: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Error.html" title="struct core::fmt::Error">Error</a>></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rand/os.rs.html#51-53' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
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