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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | <html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>kcapi_hkdf</title><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"><link rel="home" href="index.html" title="Linux Kernel Crypto API User Space Interface Library"><link rel="up" href="ch03s24.html" title="Key Derivation Functions"><link rel="prev" href="API-kcapi-pbkdf-iteration-count.html" title="kcapi_pbkdf_iteration_count"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">kcapi_hkdf</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-kcapi-pbkdf-iteration-count.html">Prev</a> </td><th width="60%" align="center">Key Derivation Functions</th><td width="20%" align="right"> </td></tr></table><hr></div><div class="refentry"><a name="API-kcapi-hkdf"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>kcapi_hkdf —
Extract-and-Expand HKDF (RFC5869)
</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int32_t <b class="fsfunc">kcapi_hkdf </b>(</code></td><td>const char * <var class="pdparam">hashname</var>, </td></tr><tr><td> </td><td>const uint8_t * <var class="pdparam">ikm</var>, </td></tr><tr><td> </td><td>uint32_t <var class="pdparam">ikmlen</var>, </td></tr><tr><td> </td><td>const uint8_t * <var class="pdparam">salt</var>, </td></tr><tr><td> </td><td>uint32_t <var class="pdparam">saltlen</var>, </td></tr><tr><td> </td><td>const uint8_t * <var class="pdparam">info</var>, </td></tr><tr><td> </td><td>uint32_t <var class="pdparam">infolen</var>, </td></tr><tr><td> </td><td>uint8_t * <var class="pdparam">dst</var>, </td></tr><tr><td> </td><td>uint32_t <var class="pdparam">dlen</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a name="idm5996"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>hashname</code></em></span></dt><dd><p>
[in] kernel crypto API name of a keyed hash (e.g. hmac(sha1))
</p></dd><dt><span class="term"><em class="parameter"><code>ikm</code></em></span></dt><dd><p>
[in] Input Keying Material (IKM) -- must be provided
</p></dd><dt><span class="term"><em class="parameter"><code>ikmlen</code></em></span></dt><dd><p>
[in] IKM buffer length -- must be non-zero
</p></dd><dt><span class="term"><em class="parameter"><code>salt</code></em></span></dt><dd><p>
[in] salt buffer -- may be NULL
</p></dd><dt><span class="term"><em class="parameter"><code>saltlen</code></em></span></dt><dd><p>
[in] salt buffer length -- may be zero
</p></dd><dt><span class="term"><em class="parameter"><code>info</code></em></span></dt><dd><p>
[in] info buffer -- may be NULL
</p></dd><dt><span class="term"><em class="parameter"><code>infolen</code></em></span></dt><dd><p>
[in] info buffer length -- may be zero
</p></dd><dt><span class="term"><em class="parameter"><code>dst</code></em></span></dt><dd><p>
[out] Buffer to store the generated key in,
</p></dd><dt><span class="term"><em class="parameter"><code>dlen</code></em></span></dt><dd><p>
[in] Length of the dst buffer. This value defines the number of bytes
generated by the KDF.
</p></dd></dl></div></div><div class="refsect1"><a name="idm6044"></a><h2>Description</h2><p>
Perform the key-derivation function according to RFC5869. The input data
is defined in sections 2.2 und 2.3 of RFC5869.
</p><p>
<em class="parameter"><code>return</code></em> 0 upon success;
a negative errno-style error code if an error occurred
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