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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="`EncodedChallenge<C>` defines a challenge encoding with a [`Self::Input`] that is used to derive the challenge encoding and `get_challenge` obtains the real `C::Scalar` that the challenge encoding represents."><meta name="keywords" content="rust, rustlang, rust-lang, EncodedChallenge"><title>EncodedChallenge in halo2_proofs::transcript - Rust</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" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script src="../../crates.js"></script><script defer src="../../main.js"></script>
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</head><body class="rustdoc trait"><!--[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">☰</button><a class="sidebar-logo" href="../../halo2_proofs/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div>
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</a><h2 class="location"><a href="#">EncodedChallenge</a></h2><div class="sidebar-elems"><section><div class="block"><h3 class="sidebar-title"><a href="#required-associated-types">Required Associated Types</a></h3><ul><li><a href="#associatedtype.Input">Input</a></li></ul></div><div class="block"><h3 class="sidebar-title"><a href="#required-methods">Required Methods</a></h3><ul><li><a href="#tymethod.get_scalar">get_scalar</a></li><li><a href="#tymethod.new">new</a></li></ul></div><div class="block"><h3 class="sidebar-title"><a href="#provided-methods">Provided Methods</a></h3><ul><li><a href="#method.as_challenge_scalar">as_challenge_scalar</a></li></ul></div><div class="block"><h3 class="sidebar-title"><a href="#implementors">Implementors</a></h3></div></section><h2 class="location"><a href="index.html">In halo2_proofs::transcript</a></h2><div id="sidebar-vars" data-name="EncodedChallenge" data-ty="trait" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../../halo2_proofs/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><nav class="sub"><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"><button type="button" id="help-button" title="help">?</button><div id="settings-menu" tabindex="-1">
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<h1 class="fqn"><span class="in-band">Trait <a href="../index.html">halo2_proofs</a>::<wbr><a href="index.html">transcript</a>::<wbr><a class="trait" href="#">EncodedChallenge</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"><a class="srclink" href="../../src/halo2_proofs/transcript.rs.html#243-262">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span></div><div class="docblock item-decl"><pre class="rust trait"><code>pub trait EncodedChallenge<C: <a class="trait" href="../arithmetic/trait.CurveAffine.html" title="trait halo2_proofs::arithmetic::CurveAffine">CurveAffine</a>> {
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type <a href="#associatedtype.Input" class="associatedtype">Input</a>;
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fn <a href="#tymethod.new" class="fnname">new</a>(challenge_input: &Self::<a class="associatedtype" href="trait.EncodedChallenge.html#associatedtype.Input" title="type halo2_proofs::transcript::EncodedChallenge::Input">Input</a>) -> Self;
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<span class="item-spacer"></span> fn <a href="#tymethod.get_scalar" class="fnname">get_scalar</a>(&self) -> C::Scalar;
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fn <a href="#method.as_challenge_scalar" class="fnname">as_challenge_scalar</a><T>(&self) -> <a class="struct" href="struct.ChallengeScalar.html" title="struct halo2_proofs::transcript::ChallengeScalar">ChallengeScalar</a><C, T> { ... }
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}</code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p><code>EncodedChallenge<C></code> defines a challenge encoding with a <a href="trait.EncodedChallenge.html#associatedtype.Input" title="Self::Input"><code>Self::Input</code></a>
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that is used to derive the challenge encoding and <code>get_challenge</code> obtains
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the <em>real</em> <code>C::Scalar</code> that the challenge encoding represents.</p>
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</div></details><h2 id="required-associated-types" class="small-section-header">Required Associated Types<a href="#required-associated-types" class="anchor"></a></h2><div class="methods"><details class="rustdoc-toggle" open><summary><div id="associatedtype.Input" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/halo2_proofs/transcript.rs.html#247">source</a></div><h4 class="code-header">type <a href="#associatedtype.Input" class="associatedtype">Input</a></h4></div></summary><div class="docblock"><p>The Input type used to derive the challenge encoding. For example,
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an input from the Poseidon hash would be a base field element;
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an input from the Blake2b hash would be a [u8; 64].</p>
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</div></details></div><h2 id="required-methods" class="small-section-header">Required Methods<a href="#required-methods" class="anchor"></a></h2><div class="methods"><details class="rustdoc-toggle" open><summary><div id="tymethod.new" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/halo2_proofs/transcript.rs.html#250">source</a></div><h4 class="code-header">fn <a href="#tymethod.new" class="fnname">new</a>(challenge_input: &Self::<a class="associatedtype" href="trait.EncodedChallenge.html#associatedtype.Input" title="type halo2_proofs::transcript::EncodedChallenge::Input">Input</a>) -> Self</h4></div></summary><div class="docblock"><p>Get an encoded challenge from a given input challenge.</p>
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</div></details><details class="rustdoc-toggle" open><summary><div id="tymethod.get_scalar" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/halo2_proofs/transcript.rs.html#253">source</a></div><h4 class="code-header">fn <a href="#tymethod.get_scalar" class="fnname">get_scalar</a>(&self) -> C::Scalar</h4></div></summary><div class="docblock"><p>Get a scalar field element from an encoded challenge.</p>
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</div></details></div><h2 id="provided-methods" class="small-section-header">Provided Methods<a href="#provided-methods" class="anchor"></a></h2><div class="methods"><details class="rustdoc-toggle" open><summary><div id="method.as_challenge_scalar" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/halo2_proofs/transcript.rs.html#256-261">source</a></div><h4 class="code-header">fn <a href="#method.as_challenge_scalar" class="fnname">as_challenge_scalar</a><T>(&self) -> <a class="struct" href="struct.ChallengeScalar.html" title="struct halo2_proofs::transcript::ChallengeScalar">ChallengeScalar</a><C, T></h4></div></summary><div class="docblock"><p>Cast an encoded challenge as a typed <code>ChallengeScalar</code>.</p>
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</div></details></div><h2 id="implementors" class="small-section-header">Implementors<a href="#implementors" class="anchor"></a></h2><div class="item-list" id="implementors-list"><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-EncodedChallenge%3CC%3E" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/halo2_proofs/transcript.rs.html#276-294">source</a></span><a href="#impl-EncodedChallenge%3CC%3E" class="anchor"></a><h3 class="code-header in-band">impl<C: <a class="trait" href="../arithmetic/trait.CurveAffine.html" title="trait halo2_proofs::arithmetic::CurveAffine">CurveAffine</a>> <a class="trait" href="trait.EncodedChallenge.html" title="trait halo2_proofs::transcript::EncodedChallenge">EncodedChallenge</a><C> for <a class="struct" href="struct.Challenge255.html" title="struct halo2_proofs::transcript::Challenge255">Challenge255</a><C></h3></section></summary><div class="impl-items"><section id="associatedtype.Input-1" class="associatedtype trait-impl has-srclink"><a href="#associatedtype.Input-1" class="anchor"></a><h4 class="code-header">type <a href="#associatedtype.Input" class="associatedtype">Input</a> = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">[</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.array.html">; 64]</a></h4></section></div></details></div><script type="text/javascript" src="../../implementors/halo2_proofs/transcript/trait.EncodedChallenge.js" data-ignore-extern-crates="" async></script></section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="halo2_proofs" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.63.0-nightly (490324f7b 2022-05-26)" ></div>
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