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<p class='location'><a href='../index.html'>rand</a>::<wbr><a href='index.html'>chacha</a></p><script>window.sidebarCurrent = {name: 'ChaChaRng', ty: 'struct', relpath: ''};</script><script defer src="sidebar-items.js"></script>
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<h1 class='fqn'><span class='in-band'>Struct <a href='../index.html'>rand</a>::<wbr><a href='index.html'>chacha</a>::<wbr><a class='struct' href=''>ChaChaRng</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>−</span>]
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</span><a id='src-829' class='srclink' href='../../src/rand/chacha.rs.html#30-34' title='goto source code'>[src]</a></span></h1>
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<pre class='rust struct'>pub struct ChaChaRng {
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// some fields omitted
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}</pre><div class='docblock'><p>A random number generator that uses the ChaCha20 algorithm [1].</p>
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<p>The ChaCha algorithm is widely accepted as suitable for
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cryptographic purposes, but this implementation has not been
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verified as such. Prefer a generator like <code>OsRng</code> that defers to
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the operating system for cases that need high security.</p>
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<p>[1]: D. J. Bernstein, <a href="http://cr.yp.to/chacha.html"><em>ChaCha, a variant of
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Salsa20</em></a></p>
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</div><h2 id='methods'>Methods</h2><h3 class='impl'><span class='in-band'><code>impl <a class='struct' href='../../rand/chacha/struct.ChaChaRng.html' title='rand::chacha::ChaChaRng'>ChaChaRng</a></code></span><span class='out-of-band'><div class='ghost'></div><a id='src-851' class='srclink' href='../../src/rand/chacha.rs.html#80-155' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.new_unseeded' class='method'><code>fn <a href='#method.new_unseeded' class='fnname'>new_unseeded</a>() -> <a class='struct' href='../../rand/chacha/struct.ChaChaRng.html' title='rand::chacha::ChaChaRng'>ChaChaRng</a></code></h4>
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<div class='docblock'><p>Create an ChaCha random number generator using the default
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fixed key of 8 zero words.</p>
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</div><h4 id='method.set_counter' class='method'><code>fn <a href='#method.set_counter' class='fnname'>set_counter</a>(&mut self, counter_low: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.u64.html'>u64</a>, counter_high: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.u64.html'>u64</a>)</code></h4>
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<div class='docblock'><p>Sets the internal 128-bit ChaCha counter to
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a user-provided value. This permits jumping
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arbitrarily ahead (or backwards) in the pseudorandom stream.</p>
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<p>Since the nonce words are used to extend the counter to 128 bits,
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users wishing to obtain the conventional ChaCha pseudorandom stream
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associated with a particular nonce can call this function with
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arguments <code>0, desired_nonce</code>.</p>
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</div></div><h2 id='implementations'>Trait Implementations</h2><h3 class='impl'><span class='in-band'><code>impl <a class='trait' href='../../rand/trait.Rng.html' title='rand::Rng'>Rng</a> for <a class='struct' href='../../rand/chacha/struct.ChaChaRng.html' title='rand::chacha::ChaChaRng'>ChaChaRng</a></code></span><span class='out-of-band'><div class='ghost'></div><a id='src-866' class='srclink' href='../../src/rand/chacha.rs.html#157-168' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.next_u32' class='method'><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></h4>
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<h4 id='method.next_u64' class='method'><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></h4>
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<h4 id='method.next_f32' class='method'><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></h4>
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<h4 id='method.next_f64' class='method'><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></h4>
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<h4 id='method.fill_bytes' class='method'><code>fn <a href='../../rand/trait.Rng.html#method.fill_bytes' class='fnname'>fill_bytes</a>(&mut self, dest: <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></h4>
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<h4 id='method.gen' class='method'><code>fn <a href='../../rand/trait.Rng.html#method.gen' class='fnname'>gen</a><T: <a class='trait' href='../../rand/trait.Rand.html' title='rand::Rand'>Rand</a>>(&mut self) -> T <span class='where'>where Self: <a class='trait' href='https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html' title='core::marker::Sized'>Sized</a></span></code></h4>
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<h4 id='method.gen_iter' class='method'><code>fn <a href='../../rand/trait.Rng.html#method.gen_iter' class='fnname'>gen_iter</a><'a, T: <a class='trait' href='../../rand/trait.Rand.html' title='rand::Rand'>Rand</a>>(&'a mut self) -> <a class='struct' href='../../rand/struct.Generator.html' title='rand::Generator'>Generator</a><'a, T, Self> <span class='where'>where Self: <a class='trait' href='https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html' title='core::marker::Sized'>Sized</a></span></code></h4>
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<h4 id='method.gen_range' class='method'><code>fn <a href='../../rand/trait.Rng.html#method.gen_range' class='fnname'>gen_range</a><T: <a class='trait' href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialOrd.html' title='core::cmp::PartialOrd'>PartialOrd</a> + <a class='trait' href='../../rand/distributions/range/trait.SampleRange.html' title='rand::distributions::range::SampleRange'>SampleRange</a>>(&mut self, low: T, high: T) -> T <span class='where'>where Self: <a class='trait' href='https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html' title='core::marker::Sized'>Sized</a></span></code></h4>
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<h4 id='method.gen_weighted_bool' class='method'><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> <span class='where'>where Self: <a class='trait' href='https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html' title='core::marker::Sized'>Sized</a></span></code></h4>
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<h4 id='method.gen_ascii_chars' class='method'><code>fn <a href='../../rand/trait.Rng.html#method.gen_ascii_chars' class='fnname'>gen_ascii_chars</a><'a>(&'a mut self) -> <a class='struct' href='../../rand/struct.AsciiGenerator.html' title='rand::AsciiGenerator'>AsciiGenerator</a><'a, Self> <span class='where'>where Self: <a class='trait' href='https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html' title='core::marker::Sized'>Sized</a></span></code></h4>
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<h4 id='method.choose' class='method'><code>fn <a href='../../rand/trait.Rng.html#method.choose' class='fnname'>choose</a><'a, T>(&mut self, values: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>&'a [</a>T<a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>]</a>) -> <a class='enum' href='https://doc.rust-lang.org/nightly/core/option/enum.Option.html' title='core::option::Option'>Option</a><&'a T> <span class='where'>where Self: <a class='trait' href='https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html' title='core::marker::Sized'>Sized</a></span></code></h4>
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<h4 id='method.shuffle' class='method'><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 [</a>T<a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>]</a>) <span class='where'>where Self: <a class='trait' href='https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html' title='core::marker::Sized'>Sized</a></span></code></h4>
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</div><h3 class='impl'><span class='in-band'><code>impl<'a> <a class='trait' href='../../rand/trait.SeedableRng.html' title='rand::SeedableRng'>SeedableRng</a><<a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>&'a [</a><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.slice.html'>]</a>> for <a class='struct' href='../../rand/chacha/struct.ChaChaRng.html' title='rand::chacha::ChaChaRng'>ChaChaRng</a></code></span><span class='out-of-band'><div class='ghost'></div><a id='src-870' class='srclink' href='../../src/rand/chacha.rs.html#170-191' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.reseed' class='method'><code>fn <a href='../../rand/trait.SeedableRng.html#tymethod.reseed' class='fnname'>reseed</a>(&mut self, seed: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>&'a [</a><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.slice.html'>]</a>)</code></h4>
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<h4 id='method.from_seed' class='method'><code>fn <a href='../../rand/trait.SeedableRng.html#tymethod.from_seed' class='fnname'>from_seed</a>(seed: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>&'a [</a><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.slice.html'>]</a>) -> <a class='struct' href='../../rand/chacha/struct.ChaChaRng.html' title='rand::chacha::ChaChaRng'>ChaChaRng</a></code></h4>
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<div class='docblock'><p>Create a ChaCha generator from a seed,
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obtained from a variable-length u32 array.
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Only up to 8 words are used; if less than 8
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words are used, the remaining are set to zero.</p>
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</div></div><h3 class='impl'><span class='in-band'><code>impl <a class='trait' href='../../rand/trait.Rand.html' title='rand::Rand'>Rand</a> for <a class='struct' href='../../rand/chacha/struct.ChaChaRng.html' title='rand::chacha::ChaChaRng'>ChaChaRng</a></code></span><span class='out-of-band'><div class='ghost'></div><a id='src-882' class='srclink' href='../../src/rand/chacha.rs.html#193-201' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.rand' class='method'><code>fn <a href='../../rand/trait.Rand.html#tymethod.rand' class='fnname'>rand</a><R: <a class='trait' href='../../rand/trait.Rng.html' title='rand::Rng'>Rng</a>>(other: &mut R) -> <a class='struct' href='../../rand/chacha/struct.ChaChaRng.html' title='rand::chacha::ChaChaRng'>ChaChaRng</a></code></h4>
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</div><h3 id='derived_implementations'>Derived Implementations </h3><h3 class='impl'><span class='in-band'><code>impl <a class='trait' href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html' title='core::clone::Clone'>Clone</a> for <a class='struct' href='../../rand/chacha/struct.ChaChaRng.html' title='rand::chacha::ChaChaRng'>ChaChaRng</a></code></span><span class='out-of-band'><div class='ghost'></div><a id='src-835' class='srclink' href='../../src/rand/chacha.rs.html#29' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.clone' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone' class='fnname'>clone</a>(&self) -> <a class='struct' href='../../rand/chacha/struct.ChaChaRng.html' title='rand::chacha::ChaChaRng'>ChaChaRng</a></code></h4>
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<h4 id='method.clone_from' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from' class='fnname'>clone_from</a>(&mut self, source: &Self)</code><div class="since">1.0.0</div></h4>
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</div><h3 class='impl'><span class='in-band'><code>impl <a class='trait' href='https://doc.rust-lang.org/nightly/core/marker/trait.Copy.html' title='core::marker::Copy'>Copy</a> for <a class='struct' href='../../rand/chacha/struct.ChaChaRng.html' title='rand::chacha::ChaChaRng'>ChaChaRng</a></code></span><span class='out-of-band'><div class='ghost'></div><a id='src-841' class='srclink' href='../../src/rand/chacha.rs.html#29' title='goto source code'>[src]</a></span></h3>
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