<!DOCTYPE html><htmllang="en"><head><metacharset="utf-8"><metaname="viewport"content="width=device-width, initial-scale=1.0"><metaname="generator"content="rustdoc"><metaname="description"content="Gadget and chips for the SHA-256 hash function."><metaname="keywords"content="rust, rustlang, rust-lang, sha256"><title>halo2_gadgets::sha256 - Rust</title><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../../SourceSerif4-Regular.ttf.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../../FiraSans-Regular.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../../FiraSans-Medium.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../../SourceCodePro-Regular.ttf.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../../SourceSerif4-Bold.ttf.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../../SourceCodePro-Semibold.ttf.woff2"><linkrel="stylesheet"type="text/css"href="../../normalize.css"><linkrel="stylesheet"type="text/css"href="../../rustdoc.css"id="mainThemeStyle"><linkrel="stylesheet"type="text/css"href="../../ayu.css"disabled><linkrel="stylesheet"type="text/css"href="../../dark.css"disabled><linkrel="stylesheet"type="text/css"href="../../light.css"id="themeStyle"><scriptid="default-settings"></script><scriptsrc="../../storage.js"></script><scriptsrc="../../crates.js"></script><scriptdefersrc="../../main.js"></script>
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</a><h2class="location"><ahref="#">Module sha256</a></h2><divclass="sidebar-elems"><section><divclass="block"><ul><li><ahref="#structs">Structs</a></li><li><ahref="#constants">Constants</a></li><li><ahref="#traits">Traits</a></li></ul></div></section><divid="sidebar-vars"data-name="sha256"data-ty="mod"data-relpath="./"></div><scriptdefersrc="./sidebar-items.js"></script></div></nav><main><divclass="width-limiter"><divclass="sub-container"><aclass="sub-logo-container"href="../../halo2_gadgets/index.html"><imgclass="rust-logo"src="../../rust-logo.svg"alt="logo"></a><navclass="sub"><divclass="theme-picker hidden"><buttonid="theme-picker"aria-label="Pick another theme!"aria-haspopup="menu"title="themes"><imgwidth="22"height="22"alt="Pick another theme!"src="../../brush.svg"></button><divid="theme-choices"role="menu"></div></div><formclass="search-form"><divclass="search-container"><span></span><inputclass="search-input"name="search"autocomplete="off"spellcheck="false"placeholder="Click or press ‘S’ to search, ‘?’ for more options…"type="search"><buttontype="button"id="help-button"title="help">?</button><aid="settings-menu"href="../../settings.html"title="settings"><imgwidth="22"height="22"alt="Change settings"src="../../wheel.svg"></a></div></form></nav></div><sectionid="main-content"class="content"><divclass="main-heading">
<h1class="fqn"><spanclass="in-band">Module <ahref="../index.html">halo2_gadgets</a>::<wbr><aclass="mod"href="#">sha256</a><buttonid="copy-path"onclick="copy_path(this)"title="Copy item path to clipboard"><imgsrc="../../clipboard.svg"width="19"height="18"alt="Copy item path"></button></span></h1><spanclass="out-of-band"><aclass="srclink"href="../../src/halo2_gadgets/sha256.rs.html#1-166">source</a> · <aid="toggle-all-docs"href="javascript:void(0)"title="collapse all docs">[<spanclass="inner">−</span>]</a></span></div><detailsclass="rustdoc-toggle top-doc"open><summaryclass="hideme"><span>Expand description</span></summary><divclass="docblock"><p>Gadget and chips for the <ahref="https://tools.ietf.org/html/rfc6234">SHA-256</a> hash function.</p>
<divclass="item-table"><divclass="item-row"><divclass="item-left module-item"><aclass="struct"href="struct.BlockWord.html"title="halo2_gadgets::sha256::BlockWord struct">BlockWord</a></div><divclass="item-right docblock-short"><p>A word in a <code>Table16</code> message block.</p>
</div></div><divclass="item-row"><divclass="item-left module-item"><aclass="struct"href="struct.Sha256.html"title="halo2_gadgets::sha256::Sha256 struct">Sha256</a></div><divclass="item-right docblock-short"><p>A gadget that constrains a SHA-256 invocation. It supports input at a granularity of
32 bits.</p>
</div></div><divclass="item-row"><divclass="item-left module-item"><aclass="struct"href="struct.Sha256Digest.html"title="halo2_gadgets::sha256::Sha256Digest struct">Sha256Digest</a></div><divclass="item-right docblock-short"><p>The output of a SHA-256 circuit invocation.</p>
</div></div><divclass="item-row"><divclass="item-left module-item"><aclass="struct"href="struct.Table16Chip.html"title="halo2_gadgets::sha256::Table16Chip struct">Table16Chip</a></div><divclass="item-right docblock-short"><p>A chip that implements SHA-256 with a maximum lookup table size of $2^16$.</p>
</div></div><divclass="item-row"><divclass="item-left module-item"><aclass="struct"href="struct.Table16Config.html"title="halo2_gadgets::sha256::Table16Config struct">Table16Config</a></div><divclass="item-right docblock-short"><p>Configuration for a <ahref="struct.Table16Chip.html"title="Table16Chip"><code>Table16Chip</code></a>.</p>
<divclass="item-table"><divclass="item-row"><divclass="item-left module-item"><aclass="constant"href="constant.BLOCK_SIZE.html"title="halo2_gadgets::sha256::BLOCK_SIZE constant">BLOCK_SIZE</a></div><divclass="item-right docblock-short"><p>The size of a SHA-256 block, in 32-bit words.</p>
<divclass="item-table"><divclass="item-row"><divclass="item-left module-item"><aclass="trait"href="trait.Sha256Instructions.html"title="halo2_gadgets::sha256::Sha256Instructions trait">Sha256Instructions</a></div><divclass="item-right docblock-short"><p>The set of circuit instructions required to use the <ahref="struct.Sha256.html"title="Sha256"><code>Sha256</code></a> gadget.</p>