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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="Instructions that can be implemented for a curve whose base field fits into its scalar field."><title>BaseFitsInScalarInstructions in halo2_gadgets::ecc - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceSerif4-Bold-a2c9cd1067f8b328.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-fa3bb1812debf86c.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="halo2_gadgets" data-themes="" data-resource-suffix="" data-rustdoc-version="1.75.0-nightly (2bbb61989 2023-10-04)" data-channel="nightly" data-search-js="search-8be46b629f5f14a8.js" data-settings-js="settings-74424d7eec62a23e.js" ><script src="../../static.files/storage-fec3eaa3851e447d.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-c5bd66d33317d69f.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-5d8b3c7633ad77ba.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-2c020d218678b618.svg"><link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/katex@0.10.0/dist/katex.min.css" integrity="sha384-9eLZqc9ds8eNjO3TmqPeYcDj8n+Qfa4nuSiGYa6DjLNcv9BtN69ZIulL9+8CqC9Y" crossorigin="anonymous">
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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">&#9776;</button><a class="logo-container" href="../../halo2_gadgets/index.html"><img class="rust-logo" src="../../static.files/rust-logo-151179464ae7ed46.svg" alt="logo"></a></nav><nav class="sidebar"><a class="logo-container" href="../../halo2_gadgets/index.html"><img class="rust-logo" src="../../static.files/rust-logo-151179464ae7ed46.svg" alt="logo"></a><h2 class="location"><a href="#">BaseFitsInScalarInstructions</a></h2><div class="sidebar-elems"><section><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.scalar_var_from_base">scalar_var_from_base</a></li></ul><h3><a href="#implementors">Implementors</a></h3></section><h2><a href="index.html">In halo2_gadgets::ecc</a></h2></div></nav><main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press S to search, ? for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1>Trait <a href="../index.html">halo2_gadgets</a>::<wbr><a href="index.html">ecc</a>::<wbr><a class="trait" href="#">BaseFitsInScalarInstructions</a><button id="copy-path" title="Copy item path to clipboard"><img src="../../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../../src/halo2_gadgets/ecc.rs.html#152-160">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>&#x2212;</span>]</button></span></div><pre class="rust item-decl"><code>pub trait BaseFitsInScalarInstructions&lt;C: CurveAffine&gt;: <a class="trait" href="trait.EccInstructions.html" title="trait halo2_gadgets::ecc::EccInstructions">EccInstructions</a>&lt;C&gt; {
// Required method
fn <a href="#tymethod.scalar_var_from_base" class="fn">scalar_var_from_base</a>(
&amp;self,
layouter: &amp;mut impl <a class="trait" href="../../halo2_proofs/circuit/trait.Layouter.html" title="trait halo2_proofs::circuit::Layouter">Layouter</a>&lt;C::Base&gt;,
base: &amp;Self::<a class="associatedtype" href="../utilities/trait.UtilitiesInstructions.html#associatedtype.Var" title="type halo2_gadgets::utilities::UtilitiesInstructions::Var">Var</a>
) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="associatedtype" href="trait.EccInstructions.html#associatedtype.ScalarVar" title="type halo2_gadgets::ecc::EccInstructions::ScalarVar">ScalarVar</a>, <a class="enum" href="../../halo2_proofs/plonk/error/enum.Error.html" title="enum halo2_proofs::plonk::error::Error">Error</a>&gt;;
}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Instructions that can be implemented for a curve whose base field fits into
its scalar field.</p>
</div></details><h2 id="required-methods" class="small-section-header">Required Methods<a href="#required-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="tymethod.scalar_var_from_base" class="method"><a class="src rightside" href="../../src/halo2_gadgets/ecc.rs.html#155-159">source</a><h4 class="code-header">fn <a href="#tymethod.scalar_var_from_base" class="fn">scalar_var_from_base</a>(
&amp;self,
layouter: &amp;mut impl <a class="trait" href="../../halo2_proofs/circuit/trait.Layouter.html" title="trait halo2_proofs::circuit::Layouter">Layouter</a>&lt;C::Base&gt;,
base: &amp;Self::<a class="associatedtype" href="../utilities/trait.UtilitiesInstructions.html#associatedtype.Var" title="type halo2_gadgets::utilities::UtilitiesInstructions::Var">Var</a>
) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="associatedtype" href="trait.EccInstructions.html#associatedtype.ScalarVar" title="type halo2_gadgets::ecc::EccInstructions::ScalarVar">ScalarVar</a>, <a class="enum" href="../../halo2_proofs/plonk/error/enum.Error.html" title="enum halo2_proofs::plonk::error::Error">Error</a>&gt;</h4></section></summary><div class="docblock"><p>Converts a base field element that exists as a variable in the circuit
into a scalar to be used in variable-base scalar multiplication.</p>
</div></details></div><h2 id="implementors" class="small-section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"><section id="impl-BaseFitsInScalarInstructions%3CEpAffine%3E-for-EccChip%3CFixed%3E" class="impl"><a class="src rightside" href="../../src/halo2_gadgets/ecc/chip.rs.html#597-614">source</a><a href="#impl-BaseFitsInScalarInstructions%3CEpAffine%3E-for-EccChip%3CFixed%3E" class="anchor">§</a><h3 class="code-header">impl&lt;Fixed: <a class="trait" href="trait.FixedPoints.html" title="trait halo2_gadgets::ecc::FixedPoints">FixedPoints</a>&lt;Affine&gt;&gt; <a class="trait" href="trait.BaseFitsInScalarInstructions.html" title="trait halo2_gadgets::ecc::BaseFitsInScalarInstructions">BaseFitsInScalarInstructions</a>&lt;EpAffine&gt; for <a class="struct" href="chip/struct.EccChip.html" title="struct halo2_gadgets::ecc::chip::EccChip">EccChip</a>&lt;Fixed&gt;<span class="where fmt-newline">where
&lt;Fixed as <a class="trait" href="trait.FixedPoints.html" title="trait halo2_gadgets::ecc::FixedPoints">FixedPoints</a>&lt;Affine&gt;&gt;::<a class="associatedtype" href="trait.FixedPoints.html#associatedtype.Base" title="type halo2_gadgets::ecc::FixedPoints::Base">Base</a>: <a class="trait" href="chip/trait.FixedPoint.html" title="trait halo2_gadgets::ecc::chip::FixedPoint">FixedPoint</a>&lt;Affine, FixedScalarKind = <a class="enum" href="chip/enum.BaseFieldElem.html" title="enum halo2_gadgets::ecc::chip::BaseFieldElem">BaseFieldElem</a>&gt;,
&lt;Fixed as <a class="trait" href="trait.FixedPoints.html" title="trait halo2_gadgets::ecc::FixedPoints">FixedPoints</a>&lt;Affine&gt;&gt;::<a class="associatedtype" href="trait.FixedPoints.html#associatedtype.FullScalar" title="type halo2_gadgets::ecc::FixedPoints::FullScalar">FullScalar</a>: <a class="trait" href="chip/trait.FixedPoint.html" title="trait halo2_gadgets::ecc::chip::FixedPoint">FixedPoint</a>&lt;Affine, FixedScalarKind = <a class="enum" href="chip/enum.FullScalar.html" title="enum halo2_gadgets::ecc::chip::FullScalar">FullScalar</a>&gt;,
&lt;Fixed as <a class="trait" href="trait.FixedPoints.html" title="trait halo2_gadgets::ecc::FixedPoints">FixedPoints</a>&lt;Affine&gt;&gt;::<a class="associatedtype" href="trait.FixedPoints.html#associatedtype.ShortScalar" title="type halo2_gadgets::ecc::FixedPoints::ShortScalar">ShortScalar</a>: <a class="trait" href="chip/trait.FixedPoint.html" title="trait halo2_gadgets::ecc::chip::FixedPoint">FixedPoint</a>&lt;Affine, FixedScalarKind = <a class="enum" href="chip/enum.ShortScalar.html" title="enum halo2_gadgets::ecc::chip::ShortScalar">ShortScalar</a>&gt;,</span></h3></section></div><script src="../../implementors/halo2_gadgets/ecc/trait.BaseFitsInScalarInstructions.js" async></script></section></div></main></body></html>