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<p class='location'><a href='../index.html'>ring</a>::<wbr><a href='index.html'>pbkdf2</a></p><script>window.sidebarCurrent = {name: 'derive', ty: 'fn', relpath: ''};</script><script defer src="sidebar-items.js"></script>
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<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'>
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</span><a class='srclink' href='../../src/ring/pbkdf2.rs.html#142-164' title='goto source code'>[src]</a></span></h1>
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<pre class='rust fn'>pub fn derive(<br> digest_alg: &'static <a class="struct" href="../../ring/digest/struct.Algorithm.html" title="struct ring::digest::Algorithm">Algorithm</a>, <br> iterations: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>, <br> salt: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.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.slice.html">]</a>, <br> secret: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.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.slice.html">]</a>, <br> out: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&mut [</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.slice.html">]</a><br>)</pre><div class='docblock'><p>Fills <code>out</code> with the key derived using PBKDF2 with the given inputs.</p>
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<p>Do not use <code>derive</code> as part of verifying a secret; use <code>verify</code> instead, to
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minimize the effectiveness of timing attacks.</p>
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<p><code>out.len()</code> must be no larger than the digest length * (2**32 - 1), per the
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PBKDF2 specification.</p>
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<table>
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<thead>
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<tr>
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<th>Parameter</th>
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<th>RFC 2898 Section 5.2 Term</th>
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</tr>
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</thead>
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<tr>
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<td>digest_alg</td>
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<td>PRF (HMAC with the given digest algorithm)</td>
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</tr>
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<tr>
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<td>iterations</td>
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<td>c (iteration count)</td>
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<td>salt</td>
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<td>S (salt)</td>
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<td>secret</td>
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<td>P (password)</td>
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<td>out</td>
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<td>dk (derived key)</td>
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<td>out.len()</td>
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<td>dkLen (derived key length)</td>
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<p>C analog: <code>PKCS5_PBKDF2_HMAC</code></p>
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<h1 id='panics' class='section-header'><a href='#panics'>Panics</a></h1>
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<p><code>derive</code> panics if <code>iterations < 1</code>.</p>
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<p><code>derive</code> panics if <code>out.len()</code> is larger than (2**32 - 1) * the digest
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algorithm's output length, per the PBKDF2 specification.</p>
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