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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="HMAC-based Extract-and-Expand Key Derivation Function."><title>ring::hkdf - 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/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-ac92e1bbe349e143.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="ring" data-themes="" data-resource-suffix="" data-rustdoc-version="1.76.0 (07dca489a 2024-02-04)" data-channel="1.76.0" data-search-js="search-2b6ce74ff89ae146.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../static.files/storage-f2adc0d6ca4d09fb.js"></script><script defer src="../sidebar-items.js"></script><script defer src="../../static.files/main-305769736d49e732.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-feafe1bb7466e4bd.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"></head><body class="rustdoc mod"><!--[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></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../ring/index.html">ring</a><span class="version">0.16.20</span></h2></div><h2 class="location"><a href="#">Module hkdf</a></h2><div class="sidebar-elems"><section><ul class="block"><li><a href="#structs">Structs</a></li><li><a href="#statics">Statics</a></li><li><a href="#traits">Traits</a></li></ul></section><h2><a href="../index.html">In crate ring</a></h2></div></nav><div class="sidebar-resizer"></div>
<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../../ring/all.html" title="show sidebar"></a></div><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" tabindex="-1"><a href="../../help.html" title="help">?</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>Module <a href="../index.html">ring</a>::<wbr><a class="mod" href="#">hkdf</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/ring/hkdf.rs.html#15-233">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>&#x2212;</span>]</button></span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>HMAC-based Extract-and-Expand Key Derivation Function.</p>
<p>HKDF is specified in <a href="https://tools.ietf.org/html/rfc5869">RFC 5869</a>.</p>
</div></details><h2 id="structs" class="section-header"><a href="#structs">Structs</a></h2><ul class="item-table"><li><div class="item-name"><a class="struct" href="struct.Algorithm.html" title="struct ring::hkdf::Algorithm">Algorithm</a></div><div class="desc docblock-short">An HKDF algorithm.</div></li><li><div class="item-name"><a class="struct" href="struct.Okm.html" title="struct ring::hkdf::Okm">Okm</a></div><div class="desc docblock-short">An HKDF OKM (Output Keying Material)</div></li><li><div class="item-name"><a class="struct" href="struct.Prk.html" title="struct ring::hkdf::Prk">Prk</a></div><div class="desc docblock-short">A HKDF PRK (pseudorandom key).</div></li><li><div class="item-name"><a class="struct" href="struct.Salt.html" title="struct ring::hkdf::Salt">Salt</a></div><div class="desc docblock-short">A salt for HKDF operations.</div></li></ul><h2 id="statics" class="section-header"><a href="#statics">Statics</a></h2><ul class="item-table"><li><div class="item-name"><a class="static" href="static.HKDF_SHA1_FOR_LEGACY_USE_ONLY.html" title="static ring::hkdf::HKDF_SHA1_FOR_LEGACY_USE_ONLY">HKDF_SHA1_FOR_LEGACY_USE_ONLY</a></div><div class="desc docblock-short">HKDF using HMAC-SHA-1. Obsolete.</div></li><li><div class="item-name"><a class="static" href="static.HKDF_SHA256.html" title="static ring::hkdf::HKDF_SHA256">HKDF_SHA256</a></div><div class="desc docblock-short">HKDF using HMAC-SHA-256.</div></li><li><div class="item-name"><a class="static" href="static.HKDF_SHA384.html" title="static ring::hkdf::HKDF_SHA384">HKDF_SHA384</a></div><div class="desc docblock-short">HKDF using HMAC-SHA-384.</div></li><li><div class="item-name"><a class="static" href="static.HKDF_SHA512.html" title="static ring::hkdf::HKDF_SHA512">HKDF_SHA512</a></div><div class="desc docblock-short">HKDF using HMAC-SHA-512.</div></li></ul><h2 id="traits" class="section-header"><a href="#traits">Traits</a></h2><ul class="item-table"><li><div class="item-name"><a class="trait" href="trait.KeyType.html" title="trait ring::hkdf::KeyType">KeyType</a></div><div class="desc docblock-short">The length of the OKM (Output Keying Material) for a <code>Prk::expand()</code> call.</div></li></ul></section></div></main></body></html>