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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="The `CtOption<T>` type represents an optional value similar to the `Option<T>` type but is intended for use in constant time APIs."><title>CtOption in subtle - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.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" crossorigin href="../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../static.files/rustdoc-46132b98.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="subtle" data-themes="" data-resource-suffix="" data-rustdoc-version="1.85.0 (4d91de4e4 2025-02-17)" data-channel="1.85.0" data-search-js="search-75f5ac3e.js" data-settings-js="settings-0f613d39.js" ><script src="../static.files/storage-59e33391.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-5f194d8c.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-893ab5e7.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-6580c154.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-044be391.svg"></head><body class="rustdoc struct"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button><a class="logo-container" href="../subtle/index.html"><img src="https://doc.dalek.rs/assets/dalek-logo-clear.png" alt=""></a></nav><nav class="sidebar"><div class="sidebar-crate"><a class="logo-container" href="../subtle/index.html"><img src="https://doc.dalek.rs/assets/dalek-logo-clear.png" alt="logo"></a><h2><a href="../subtle/index.html">subtle</a><span class="version">2.6.1</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">CtOption</a></h2><h3><a href="#fields">Fields</a></h3><ul class="block structfield"><li><a href="#structfield.is_some" title="is_some">is_some</a></li><li><a href="#structfield.value" title="value">value</a></li></ul><h3><a href="#implementations">Methods</a></h3><ul class="block method"><li><a href="#method.and_then" title="and_then">and_then</a></li><li><a href="#method.expect" title="expect">expect</a></li><li><a href="#method.into_option" title="into_option">into_option</a></li><li><a href="#method.is_none" title="is_none">is_none</a></li><li><a href="#method.is_some" title="is_some">is_some</a></li><li><a href="#method.map" title="map">map</a></li><li><a href="#method.new" title="new">new</a></li><li><a href="#method.or_else" title="or_else">or_else</a></li><li><a href="#method.unwrap" title="unwrap">unwrap</a></li><li><a href="#method.unwrap_or" title="unwrap_or">unwrap_or</a></li><li><a href="#method.unwrap_or_else" title="unwrap_or_else">unwrap_or_else</a></li></ul><h3><a href="#trait-implementations">Trait Implementations</a></h3><ul class="block trait-implementation"><li><a href="#impl-Clone-for-CtOption%3CT%3E" title="Clone">Clone</a></li><li><a href="#impl-ConditionallySelectable-for-CtOption%3CT%3E" title="ConditionallySelectable">ConditionallySelectable</a></li><li><a href="#impl-ConstantTimeEq-for-CtOption%3CT%3E" title="ConstantTimeEq">ConstantTimeEq</a></li><li><a href="#impl-Copy-for-CtOption%3CT%3E" title="Copy">Copy</a></li><li><a href="#impl-Debug-for-CtOption%3CT%3E" title="Debug">Debug</a></li><li><a href="#impl-From%3CCtOption%3CT%3E%3E-for-Option%3CT%3E" title="From<CtOption<T>>">From<CtOption<T>></a></li></ul><h3><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><ul class="block synthetic-implementation"><li><a href="#impl-Freeze-for-CtOption%3CT%3E" title="Freeze">Freeze</a></li><li><a href="#impl-RefUnwindSafe-for-CtOption%3CT%3E" title="RefUnwindSafe">RefUnwindSafe</a></li><li><a href="#impl-Send-for-CtOption%3CT%3E" title="Send">Send</a></li><li><a href="#impl-Sync-for-CtOption%3CT%3E" title="Sync">Sync</a></li><li><a href="#impl-Unpin-for-CtOption%3CT%3E" title="Unpin">Unpin</a></li><li><a href="#impl-UnwindSafe-for-CtOption%3CT%3E" title="UnwindSafe">UnwindSafe</a></li></ul><h3><a href="#blanket-implementations">Blanket Implementations</a></h3><ul class="block blanket-implementation"><li><a href="#impl-Any-for-T" title="Any">Any</a></li><li><a href="#impl-Borrow%3CT%3E-for-T" title="Borrow<T>">Borrow<T></a></li><li><a href="#impl-BorrowMut%3CT%3E-for-T" title="BorrowMut<T>">BorrowMut<T></a></li><li><a href="#impl-CloneToUninit-for-T" title="CloneToUninit">CloneToUninit</a></li><li><a href="#impl-From%3CT%3E-for-T" title="From<T>">From<T></a></li><li><a href="#impl-Into%3CU%3E-for-T" title="Into<U>">Into<U></a></li><li><a href="#impl-TryFrom%3CU%3E-for-T" title="TryFrom<U>">TryFrom<U></a></li><li><a href="#impl-TryInto%3CU%3E-for-T" title="TryInto<U>">TryInto<U></a></li></ul></section><div id="rustdoc-modnav"><h2 class="in-crate"><a href="index.html">In crate subtle</a></h2></div></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><span class="rustdoc-breadcrumbs"><a href="index.html">subtle</a></span><h1>Struct <span class="struct">CtOption</span><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/subtle/lib.rs.html#647-650">Source</a> </span></div><pre class="rust item-decl"><code>pub struct CtOption<T> {
pub(crate) value: T,
pub(crate) is_some: <a class="struct" href="struct.Choice.html" title="struct subtle::Choice">Choice</a>,
}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>The <code>CtOption<T></code> type represents an optional value similar to the
<a href="https://doc.rust-lang.org/1.85.0/core/option/enum.Option.html" title="enum core::option::Option"><code>Option<T></code></a> type but is intended for
use in constant time APIs.</p>
<p>Any given <code>CtOption<T></code> is either <code>Some</code> or <code>None</code>, but unlike
<code>Option<T></code> these variants are not exposed. The
<a href="struct.CtOption.html#method.is_some" title="method subtle::CtOption::is_some"><code>is_some()</code></a> method is used to determine if
the value is <code>Some</code>, and <a href="struct.CtOption.html#method.unwrap_or" title="method subtle::CtOption::unwrap_or"><code>unwrap_or()</code></a> and
<a href="struct.CtOption.html#method.unwrap_or_else" title="method subtle::CtOption::unwrap_or_else"><code>unwrap_or_else()</code></a> methods are
provided to access the underlying value. The value can also be
obtained with <a href="struct.CtOption.html#method.unwrap" title="method subtle::CtOption::unwrap"><code>unwrap()</code></a> but this will panic
if it is <code>None</code>.</p>
<p>Functions that are intended to be constant time may not produce
valid results for all inputs, such as square root and inversion
operations in finite field arithmetic. Returning an <code>Option<T></code>
from these functions makes it difficult for the caller to reason
about the result in constant time, and returning an incorrect
value burdens the caller and increases the chance of bugs.</p>
</div></details><h2 id="fields" class="fields section-header">Fields<a href="#fields" class="anchor">§</a></h2><span id="structfield.value" class="structfield section-header"><a href="#structfield.value" class="anchor field">§</a><code>value: T</code></span><span id="structfield.is_some" class="structfield section-header"><a href="#structfield.is_some" class="anchor field">§</a><code>is_some: <a class="struct" href="struct.Choice.html" title="struct subtle::Choice">Choice</a></code></span><h2 id="implementations" class="section-header">Implementations<a href="#implementations" class="anchor">§</a></h2><div id="implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-CtOption%3CT%3E" class="impl"><a class="src rightside" href="../src/subtle/lib.rs.html#671-818">Source</a><a href="#impl-CtOption%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T> <a class="struct" href="struct.CtOption.html" title="struct subtle::CtOption">CtOption</a><T></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.new" class="method"><a class="src rightside" href="../src/subtle/lib.rs.html#678-683">Source</a><h4 class="code-header">pub fn <a href="#method.new" class="fn">new</a>(value: T, is_some: <a class="struct" href="struct.Choice.html" title="struct subtle::Choice">Choice</a>) -> <a class="struct" href="struct.CtOption.html" title="struct subtle::CtOption">CtOption</a><T></h4></section></summary><div class="docblock"><p>This method is used to construct a new <code>CtOption<T></code> and takes
a value of type <code>T</code>, and a <code>Choice</code> that determines whether
the optional value should be <code>Some</code> or not. If <code>is_some</code> is
false, the value will still be stored but its value is never
exposed.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.expect" class="method"><a class="src rightside" href="../src/subtle/lib.rs.html#691-695">Source</a><h4 class="code-header">pub fn <a href="#method.expect" class="fn">expect</a>(self, msg: &<a class="primitive" href="https://doc.rust-lang.org/1.85.0/core/primitive.str.html">str</a>) -> T</h4></section></summary><div class="docblock"><p>Returns the contained value, consuming the <code>self</code> value.</p>
<h5 id="panics"><a class="doc-anchor" href="#panics">§</a>Panics</h5>
<p>Panics if the value is none with a custom panic message provided by
<code>msg</code>.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.unwrap" class="method"><a class="src rightside" href="../src/subtle/lib.rs.html#700-704">Source</a><h4 class="code-header">pub fn <a href="#method.unwrap" class="fn">unwrap</a>(self) -> T</h4></section></summary><div class="docblock"><p>This returns the underlying value but panics if it
is not <code>Some</code>.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.unwrap_or" class="method"><a class="src rightside" href="../src/subtle/lib.rs.html#709-714">Source</a><h4 class="code-header">pub fn <a href="#method.unwrap_or" class="fn">unwrap_or</a>(self, def: T) -> T<div class="where">where
T: <a class="trait" href="trait.ConditionallySelectable.html" title="trait subtle::ConditionallySelectable">ConditionallySelectable</a>,</div></h4></section></summary><div class="docblock"><p>This returns the underlying value if it is <code>Some</code>
or the provided value otherwise.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.unwrap_or_else" class="method"><a class="src rightside" href="../src/subtle/lib.rs.html#722-728">Source</a><h4 class="code-header">pub fn <a href="#method.unwrap_or_else" class="fn">unwrap_or_else</a><F>(self, f: F) -> T<div class="where">where
T: <a class="trait" href="trait.ConditionallySelectable.html" title="trait subtle::ConditionallySelectable">ConditionallySelectable</a>,
F: <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>() -> T,</div></h4></section></summary><div class="docblock"><p>This returns the underlying value if it is <code>Some</code>
or the value produced by the provided closure otherwise.</p>
<p>This operates in constant time, because the provided closure
is always called.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.is_some" class="method"><a class="src rightside" href="../src/subtle/lib.rs.html#732-734">Source</a><h4 class="code-header">pub fn <a href="#method.is_some" class="fn">is_some</a>(&self) -> <a class="struct" href="struct.Choice.html" title="struct subtle::Choice">Choice</a></h4></section></summary><div class="docblock"><p>Returns a true <code>Choice</code> if this value is <code>Some</code>.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.is_none" class="method"><a class="src rightside" href="../src/subtle/lib.rs.html#738-740">Source</a><h4 class="code-header">pub fn <a href="#method.is_none" class="fn">is_none</a>(&self) -> <a class="struct" href="struct.Choice.html" title="struct subtle::Choice">Choice</a></h4></section></summary><div class="docblock"><p>Returns a true <code>Choice</code> if this value is <code>None</code>.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.map" class="method"><a class="src rightside" href="../src/subtle/lib.rs.html#751-764">Source</a><h4 class="code-header">pub fn <a href="#method.map" class="fn">map</a><U, F>(self, f: F) -> <a class="struct" href="struct.CtOption.html" title="struct subtle::CtOption">CtOption</a><U><div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/default/trait.Default.html" title="trait core::default::Default">Default</a> + <a class="trait" href="trait.ConditionallySelectable.html" title="trait subtle::ConditionallySelectable">ConditionallySelectable</a>,
F: <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(T) -> U,</div></h4></section></summary><div class="docblock"><p>Returns a <code>None</code> value if the option is <code>None</code>, otherwise
returns a <code>CtOption</code> enclosing the value of the provided closure.
The closure is given the enclosed value or, if the option is
<code>None</code>, it is provided a dummy value computed using
<code>Default::default()</code>.</p>
<p>This operates in constant time, because the provided closure
is always called.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.and_then" class="method"><a class="src rightside" href="../src/subtle/lib.rs.html#774-787">Source</a><h4 class="code-header">pub fn <a href="#method.and_then" class="fn">and_then</a><U, F>(self, f: F) -> <a class="struct" href="struct.CtOption.html" title="struct subtle::CtOption">CtOption</a><U><div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/default/trait.Default.html" title="trait core::default::Default">Default</a> + <a class="trait" href="trait.ConditionallySelectable.html" title="trait subtle::ConditionallySelectable">ConditionallySelectable</a>,
F: <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(T) -> <a class="struct" href="struct.CtOption.html" title="struct subtle::CtOption">CtOption</a><U>,</div></h4></section></summary><div class="docblock"><p>Returns a <code>None</code> value if the option is <code>None</code>, otherwise
returns the result of the provided closure. The closure is
given the enclosed value or, if the option is <code>None</code>, it
is provided a dummy value computed using <code>Default::default()</code>.</p>
<p>This operates in constant time, because the provided closure
is always called.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.or_else" class="method"><a class="src rightside" href="../src/subtle/lib.rs.html#792-801">Source</a><h4 class="code-header">pub fn <a href="#method.or_else" class="fn">or_else</a><F>(self, f: F) -> <a class="struct" href="struct.CtOption.html" title="struct subtle::CtOption">CtOption</a><T><div class="where">where
T: <a class="trait" href="trait.ConditionallySelectable.html" title="trait subtle::ConditionallySelectable">ConditionallySelectable</a>,
F: <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>() -> <a class="struct" href="struct.CtOption.html" title="struct subtle::CtOption">CtOption</a><T>,</div></h4></section></summary><div class="docblock"><p>Returns <code>self</code> if it contains a value, and otherwise returns the result of
calling <code>f</code>. The provided function <code>f</code> is always called.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.into_option" class="method"><a class="src rightside" href="../src/subtle/lib.rs.html#815-817">Source</a><h4 class="code-header">pub fn <a href="#method.into_option" class="fn">into_option</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/1.85.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><T></h4></section></summary><div class="docblock"><p>Convert the <code>CtOption<T></code> wrapper into an <code>Option<T></code>, depending on whether
the underlying <code>is_some</code> <code>Choice</code> was a <code>0</code> or a <code>1</code> once unwrapped.</p>
<h5 id="note"><a class="doc-anchor" href="#note">§</a>Note</h5>
<p>This function exists to avoid ending up with ugly, verbose and/or bad handled
conversions from the <code>CtOption<T></code> wraps to an <code>Option<T></code> or <code>Result<T, E></code>.
This implementation doesn’t intend to be constant-time nor try to protect the
leakage of the <code>T</code> since the <code>Option<T></code> will do it anyways.</p>
<p>It’s equivalent to the corresponding <code>From</code> impl, however this version is
friendlier for type inference.</p>
</div></details></div></details></div><h2 id="trait-implementations" class="section-header">Trait Implementations<a href="#trait-implementations" class="anchor">§</a></h2><div id="trait-implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-Clone-for-CtOption%3CT%3E" class="impl"><a class="src rightside" href="../src/subtle/lib.rs.html#646">Source</a><a href="#impl-Clone-for-CtOption%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T: <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>> <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> for <a class="struct" href="struct.CtOption.html" title="struct subtle::CtOption">CtOption</a><T></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.clone" class="method trait-impl"><a class="src rightside" href="../src/subtle/lib.rs.html#646">Source</a><a href="#method.clone" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.85.0/core/clone/trait.Clone.html#tymethod.clone" class="fn">clone</a>(&self) -> <a class="struct" href="struct.CtOption.html" title="struct subtle::CtOption">CtOption</a><T></h4></section></summary><div class='docblock'>Returns a copy of the value. <a href="https://doc.rust-lang.org/1.85.0/core/clone/trait.Clone.html#tymethod.clone">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.clone_from" class="method trait-impl"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/1.85.0/src/core/clone.rs.html#174">Source</a></span><a href="#method.clone_from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.85.0/core/clone/trait.Clone.html#method.clone_from" class="fn">clone_from</a>(&mut self, source: &Self)</h4></section></summary><div class='docblock'>Performs copy-assignment from <code>source</code>. <a href="https://doc.rust-lang.org/1.85.0/core/clone/trait.Clone.html#method.clone_from">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-ConditionallySelectable-for-CtOption%3CT%3E" class="impl"><a class="src rightside" href="../src/subtle/lib.rs.html#820-827">Source</a><a href="#impl-ConditionallySelectable-for-CtOption%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T: <a class="trait" href="trait.ConditionallySelectable.html" title="trait subtle::ConditionallySelectable">ConditionallySelectable</a>> <a class="trait" href="trait.ConditionallySelectable.html" title="trait subtle::ConditionallySelectable">ConditionallySelectable</a> for <a class="struct" href="struct.CtOption.html" title="struct subtle::CtOption">CtOption</a><T></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.conditional_select" class="method trait-impl"><a class="src rightside" href="../src/subtle/lib.rs.html#821-826">Source</a><a href="#method.conditional_select" class="anchor">§</a><h4 class="code-header">fn <a href="trait.ConditionallySelectable.html#tymethod.conditional_select" class="fn">conditional_select</a>(a: &Self, b: &Self, choice: <a class="struct" href="struct.Choice.html" title="struct subtle::Choice">Choice</a>) -> Self</h4></section></summary><div class='docblock'>Select <code>a</code> or <code>b</code> according to <code>choice</code>. <a href="trait.ConditionallySelectable.html#tymethod.conditional_select">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.conditional_assign" class="method trait-impl"><a class="src rightside" href="../src/subtle/lib.rs.html#442-444">Source</a><a href="#method.conditional_assign" class="anchor">§</a><h4 class="code-header">fn <a href="trait.ConditionallySelectable.html#method.conditional_assign" class="fn">conditional_assign</a>(&mut self, other: &Self, choice: <a class="struct" href="struct.Choice.html" title="struct subtle::Choice">Choice</a>)</h4></section></summary><div class='docblock'>Conditionally assign <code>other</code> to <code>self</code>, according to <code>choice</code>. <a href="trait.ConditionallySelectable.html#method.conditional_assign">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.conditional_swap" class="method trait-impl"><a class="src rightside" href="../src/subtle/lib.rs.html#469-473">Source</a><a href="#method.conditional_swap" class="anchor">§</a><h4 class="code-header">fn <a href="trait.ConditionallySelectable.html#method.conditional_swap" class="fn">conditional_swap</a>(a: &mut Self, b: &mut Self, choice: <a class="struct" href="struct.Choice.html" title="struct subtle::Choice">Choice</a>)</h4></section></summary><div class='docblock'>Conditionally swap <code>self</code> and <code>other</code> if <code>choice == 1</code>; otherwise,
reassign both unto themselves. <a href="trait.ConditionallySelectable.html#method.conditional_swap">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-ConstantTimeEq-for-CtOption%3CT%3E" class="impl"><a class="src rightside" href="../src/subtle/lib.rs.html#829-839">Source</a><a href="#impl-ConstantTimeEq-for-CtOption%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T: <a class="trait" href="trait.ConstantTimeEq.html" title="trait subtle::ConstantTimeEq">ConstantTimeEq</a>> <a class="trait" href="trait.ConstantTimeEq.html" title="trait subtle::ConstantTimeEq">ConstantTimeEq</a> for <a class="struct" href="struct.CtOption.html" title="struct subtle::CtOption">CtOption</a><T></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.ct_eq" class="method trait-impl"><a class="src rightside" href="../src/subtle/lib.rs.html#833-838">Source</a><a href="#method.ct_eq" class="anchor">§</a><h4 class="code-header">fn <a href="trait.ConstantTimeEq.html#tymethod.ct_eq" class="fn">ct_eq</a>(&self, rhs: &<a class="struct" href="struct.CtOption.html" title="struct subtle::CtOption">CtOption</a><T>) -> <a class="struct" href="struct.Choice.html" title="struct subtle::Choice">Choice</a></h4></section></summary><div class="docblock"><p>Two <code>CtOption<T></code>s are equal if they are both <code>Some</code> and
their values are equal, or both <code>None</code>.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.ct_ne" class="method trait-impl"><a class="src rightside" href="../src/subtle/lib.rs.html#284-286">Source</a><a href="#method.ct_ne" class="anchor">§</a><h4 class="code-header">fn <a href="trait.ConstantTimeEq.html#method.ct_ne" class="fn">ct_ne</a>(&self, other: &Self) -> <a class="struct" href="struct.Choice.html" title="struct subtle::Choice">Choice</a></h4></section></summary><div class='docblock'>Determine if two items are NOT equal. <a href="trait.ConstantTimeEq.html#method.ct_ne">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Debug-for-CtOption%3CT%3E" class="impl"><a class="src rightside" href="../src/subtle/lib.rs.html#646">Source</a><a href="#impl-Debug-for-CtOption%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T: <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>> <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="struct.CtOption.html" title="struct subtle::CtOption">CtOption</a><T></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.fmt" class="method trait-impl"><a class="src rightside" href="../src/subtle/lib.rs.html#646">Source</a><a href="#method.fmt" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.85.0/core/fmt/trait.Debug.html#tymethod.fmt" class="fn">fmt</a>(&self, f: &mut <a class="struct" href="https://doc.rust-lang.org/1.85.0/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a><'_>) -> <a class="type" href="https://doc.rust-lang.org/1.85.0/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></h4></section></summary><div class='docblock'>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/1.85.0/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-From%3CCtOption%3CT%3E%3E-for-Option%3CT%3E" class="impl"><a class="src rightside" href="../src/subtle/lib.rs.html#652-669">Source</a><a href="#impl-From%3CCtOption%3CT%3E%3E-for-Option%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><<a class="struct" href="struct.CtOption.html" title="struct subtle::CtOption">CtOption</a><T>> for <a class="enum" href="https://doc.rust-lang.org/1.85.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><T></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from" class="method trait-impl"><a class="src rightside" href="../src/subtle/lib.rs.html#662-668">Source</a><a href="#method.from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.85.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(source: <a class="struct" href="struct.CtOption.html" title="struct subtle::CtOption">CtOption</a><T>) -> <a class="enum" href="https://doc.rust-lang.org/1.85.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><T></h4></section></summary><div class="docblock"><p>Convert the <code>CtOption<T></code> wrapper into an <code>Option<T></code>, depending on whether
the underlying <code>is_some</code> <code>Choice</code> was a <code>0</code> or a <code>1</code> once unwrapped.</p>
<h5 id="note-1"><a class="doc-anchor" href="#note-1">§</a>Note</h5>
<p>This function exists to avoid ending up with ugly, verbose and/or bad handled
conversions from the <code>CtOption<T></code> wraps to an <code>Option<T></code> or <code>Result<T, E></code>.
This implementation doesn’t intend to be constant-time nor try to protect the
leakage of the <code>T</code> since the <code>Option<T></code> will do it anyways.</p>
</div></details></div></details><section id="impl-Copy-for-CtOption%3CT%3E" class="impl"><a class="src rightside" href="../src/subtle/lib.rs.html#646">Source</a><a href="#impl-Copy-for-CtOption%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T: <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/marker/trait.Copy.html" title="trait core::marker::Copy">Copy</a>> <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/marker/trait.Copy.html" title="trait core::marker::Copy">Copy</a> for <a class="struct" href="struct.CtOption.html" title="struct subtle::CtOption">CtOption</a><T></h3></section></div><h2 id="synthetic-implementations" class="section-header">Auto Trait Implementations<a href="#synthetic-implementations" class="anchor">§</a></h2><div id="synthetic-implementations-list"><section id="impl-Freeze-for-CtOption%3CT%3E" class="impl"><a href="#impl-Freeze-for-CtOption%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/marker/trait.Freeze.html" title="trait core::marker::Freeze">Freeze</a> for <a class="struct" href="struct.CtOption.html" title="struct subtle::CtOption">CtOption</a><T><div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/marker/trait.Freeze.html" title="trait core::marker::Freeze">Freeze</a>,</div></h3></section><section id="impl-RefUnwindSafe-for-CtOption%3CT%3E" class="impl"><a href="#impl-RefUnwindSafe-for-CtOption%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="struct.CtOption.html" title="struct subtle::CtOption">CtOption</a><T><div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a>,</div></h3></section><section id="impl-Send-for-CtOption%3CT%3E" class="impl"><a href="#impl-Send-for-CtOption%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="struct.CtOption.html" title="struct subtle::CtOption">CtOption</a><T><div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,</div></h3></section><section id="impl-Sync-for-CtOption%3CT%3E" class="impl"><a href="#impl-Sync-for-CtOption%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="struct.CtOption.html" title="struct subtle::CtOption">CtOption</a><T><div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,</div></h3></section><section id="impl-Unpin-for-CtOption%3CT%3E" class="impl"><a href="#impl-Unpin-for-CtOption%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="struct" href="struct.CtOption.html" title="struct subtle::CtOption">CtOption</a><T><div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>,</div></h3></section><section id="impl-UnwindSafe-for-CtOption%3CT%3E" class="impl"><a href="#impl-UnwindSafe-for-CtOption%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <a class="struct" href="struct.CtOption.html" title="struct subtle::CtOption">CtOption</a><T><div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a>,</div></h3></section></div><h2 id="blanket-implementations" class="section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor">§</a></h2><div id="blanket-implementations-list"><details class="toggle implementors-toggle"><summary><section id="impl-Any-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.85.0/src/core/any.rs.html#138">Source</a><a href="#impl-Any-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T<div class="where">where
T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/1.85.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.type_id" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.85.0/src/core/any.rs.html#139">Source</a><a href="#method.type_id" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.85.0/core/any/trait.Any.html#tymethod.type_id" class="fn">type_id</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/1.85.0/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></h4></section></summary><div class='docblock'>Gets the <code>TypeId</code> of <code>self</code>. <a href="https://doc.rust-lang.org/1.85.0/core/any/trait.Any.html#tymethod.type_id">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Borrow%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.85.0/src/core/borrow.rs.html#209">Source</a><a href="#impl-Borrow%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a><T> for T<div class="where">where
T: ?<a class="trait" href="https://doc.rust-lang.org/1.85.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.85.0/src/core/borrow.rs.html#211">Source</a><a href="#method.borrow" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.85.0/core/borrow/trait.Borrow.html#tymethod.borrow" class="fn">borrow</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.85.0/core/primitive.reference.html">&T</a></h4></section></summary><div class='docblock'>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.85.0/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-BorrowMut%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.85.0/src/core/borrow.rs.html#217">Source</a><a href="#impl-BorrowMut%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a><T> for T<div class="where">where
T: ?<a class="trait" href="https://doc.rust-lang.org/1.85.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow_mut" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.85.0/src/core/borrow.rs.html#218">Source</a><a href="#method.borrow_mut" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.85.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fn">borrow_mut</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/1.85.0/core/primitive.reference.html">&mut T</a></h4></section></summary><div class='docblock'>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.85.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-CloneToUninit-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.85.0/src/core/clone.rs.html#273">Source</a><a href="#impl-CloneToUninit-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/clone/trait.CloneToUninit.html" title="trait core::clone::CloneToUninit">CloneToUninit</a> for T<div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.clone_to_uninit" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.85.0/src/core/clone.rs.html#275">Source</a><a href="#method.clone_to_uninit" class="anchor">§</a><h4 class="code-header">unsafe fn <a href="https://doc.rust-lang.org/1.85.0/core/clone/trait.CloneToUninit.html#tymethod.clone_to_uninit" class="fn">clone_to_uninit</a>(&self, dst: <a class="primitive" href="https://doc.rust-lang.org/1.85.0/core/primitive.pointer.html">*mut </a><a class="primitive" href="https://doc.rust-lang.org/1.85.0/core/primitive.u8.html">u8</a>)</h4></section></summary><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>clone_to_uninit</code>)</span></div></span><div class='docblock'>Performs copy-assignment from <code>self</code> to <code>dst</code>. <a href="https://doc.rust-lang.org/1.85.0/core/clone/trait.CloneToUninit.html#tymethod.clone_to_uninit">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-From%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.85.0/src/core/convert/mod.rs.html#767">Source</a><a href="#impl-From%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for T</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from-1" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.85.0/src/core/convert/mod.rs.html#770">Source</a><a href="#method.from-1" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.85.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(t: T) -> T</h4></section></summary><div class="docblock"><p>Returns the argument unchanged.</p>
</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Into%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.85.0/src/core/convert/mod.rs.html#750-752">Source</a><a href="#impl-Into%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><U> for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.85.0/src/core/convert/mod.rs.html#760">Source</a><a href="#method.into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.85.0/core/convert/trait.Into.html#tymethod.into" class="fn">into</a>(self) -> U</h4></section></summary><div class="docblock"><p>Calls <code>U::from(self)</code>.</p>
<p>That is, this conversion is whatever the implementation of
<code><a href="https://doc.rust-lang.org/1.85.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for U</code> chooses to do.</p>
</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryFrom%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.85.0/src/core/convert/mod.rs.html#807-809">Source</a><a href="#impl-TryFrom%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U> for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><T>,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error-1" class="associatedtype trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.85.0/src/core/convert/mod.rs.html#811">Source</a><a href="#associatedtype.Error-1" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.85.0/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="enum" href="https://doc.rust-lang.org/1.85.0/core/convert/enum.Infallible.html" title="enum core::convert::Infallible">Infallible</a></h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="toggle method-toggle" open><summary><section id="method.try_from" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.85.0/src/core/convert/mod.rs.html#814">Source</a><a href="#method.try_from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.85.0/core/convert/trait.TryFrom.html#tymethod.try_from" class="fn">try_from</a>(value: U) -> <a class="enum" href="https://doc.rust-lang.org/1.85.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <T as <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.85.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryInto%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.85.0/src/core/convert/mod.rs.html#792-794">Source</a><a href="#impl-TryInto%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a><U> for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error" class="associatedtype trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.85.0/src/core/convert/mod.rs.html#796">Source</a><a href="#associatedtype.Error" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.85.0/core/convert/trait.TryInto.html#associatedtype.Error" class="associatedtype">Error</a> = <U as <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.85.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a></h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="toggle method-toggle" open><summary><section id="method.try_into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.85.0/src/core/convert/mod.rs.html#799">Source</a><a href="#method.try_into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.85.0/core/convert/trait.TryInto.html#tymethod.try_into" class="fn">try_into</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/1.85.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><U, <U as <a class="trait" href="https://doc.rust-lang.org/1.85.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.85.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details></div></section></div></main></body></html>