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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="API documentation for the Rust `derive` fn in crate `ring`."><meta name="keywords" content="rust, rustlang, rust-lang, derive"><title>ring::pbkdf2::derive - Rust</title><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="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings"></script><script src="../../storage.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../favicon.svg">
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<a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><span class="in-band">Function <a href="../index.html">ring</a>::<wbr><a href="index.html">pbkdf2</a>::<wbr><a class="fn" href="">derive</a></span><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span><a class="srclink" href="../../src/ring/pbkdf2.rs.html#155-181" title="goto source code">[src]</a></span></h1><pre class="rust fn">pub fn derive(<br>&nbsp;&nbsp;&nbsp;&nbsp;algorithm: <a class="struct" href="../../ring/pbkdf2/struct.Algorithm.html" title="struct ring::pbkdf2::Algorithm">Algorithm</a>, <br>&nbsp;&nbsp;&nbsp;&nbsp;iterations: <a class="struct" href="https://doc.rust-lang.org/nightly/core/num/nonzero/struct.NonZeroU32.html" title="struct core::num::nonzero::NonZeroU32">NonZeroU32</a>, <br>&nbsp;&nbsp;&nbsp;&nbsp;salt: &amp;[u8], <br>&nbsp;&nbsp;&nbsp;&nbsp;secret: &amp;[u8], <br>&nbsp;&nbsp;&nbsp;&nbsp;out: &amp;mut [u8]<br>)</pre><div class="docblock"><p>Fills <code>out</code> with the key derived using PBKDF2 with the given inputs.</p>
<p>Do not use <code>derive</code> as part of verifying a secret; use <code>verify</code> instead, to
minimize the effectiveness of timing attacks.</p>
<p><code>out.len()</code> must be no larger than the digest length * (2**32 - 1), per the
PBKDF2 specification.</p>
<table><thead><tr><th>Parameter</th><th>RFC 2898 Section 5.2 Term</th></tr></thead><tbody>
<tr><td>digest_alg</td><td>PRF (HMAC with the given digest algorithm)</td></tr>
<tr><td>iterations</td><td>c (iteration count)</td></tr>
<tr><td>salt</td><td>S (salt)</td></tr>
<tr><td>secret</td><td>P (password)</td></tr>
<tr><td>out</td><td>dk (derived key)</td></tr>
<tr><td>out.len()</td><td>dkLen (derived key length)</td></tr>
</tbody></table>
<h1 id="panics" class="section-header"><a href="#panics">Panics</a></h1>
<p><code>derive</code> panics if <code>out.len()</code> is larger than (2**32 - 1) * the digest
algorithm's output length, per the PBKDF2 specification.</p>
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