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<section id="krb5-c-prfplus-generate-pseudo-random-bytes-using-rfc-6113-prf">
<h1>krb5_c_prfplus - Generate pseudo-random bytes using RFC 6113 PRF+.<a class="headerlink" href="#krb5-c-prfplus-generate-pseudo-random-bytes-using-rfc-6113-prf" title="Link to this heading">¶</a></h1>
<dl class="c function">
<dt class="sig sig-object c" id="c.krb5_c_prfplus">
<a class="reference internal" href="../types/krb5_error_code.html#c.krb5_error_code" title="krb5_error_code"><span class="n"><span class="pre">krb5_error_code</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">krb5_c_prfplus</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="../types/krb5_context.html#c.krb5_context" title="krb5_context"><span class="n"><span class="pre">krb5_context</span></span></a><span class="w"> </span><span class="n"><span class="pre">context</span></span>, <span class="k"><span class="pre">const</span></span><span class="w"> </span><a class="reference internal" href="../types/krb5_keyblock.html#c.krb5_keyblock" title="krb5_keyblock"><span class="n"><span class="pre">krb5_keyblock</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">k</span></span>, <span class="k"><span class="pre">const</span></span><span class="w"> </span><a class="reference internal" href="../types/krb5_data.html#c.krb5_data" title="krb5_data"><span class="n"><span class="pre">krb5_data</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">input</span></span>, <a class="reference internal" href="../types/krb5_data.html#c.krb5_data" title="krb5_data"><span class="n"><span class="pre">krb5_data</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">output</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.krb5_c_prfplus" title="Link to this definition">¶</a><br /></dt>
<dd></dd></dl>
<dl class="field-list">
<dt class="field-odd">param<span class="colon">:</span></dt>
<dd class="field-odd"><p><strong>[in]</strong> <strong>context</strong> - Library context</p>
<p><strong>[in]</strong> <strong>k</strong> - KDC contribution key</p>
<p><strong>[in]</strong> <strong>input</strong> - Input data</p>
<p><strong>[out]</strong> <strong>output</strong> - Pseudo-random output buffer</p>
</dd>
</dl>
<dl class="field-list simple">
<dt class="field-odd">return<span class="colon">:</span></dt>
<dd class="field-odd"><ul class="simple">
<li><p>0 on success, E2BIG if output->length is too large for PRF+ to generate, ENOMEM on allocation failure, or an error code from krb5_c_prf()</p></li>
</ul>
</dd>
</dl>
<p>This function fills <em>output</em> with PRF+(k, input) as defined in RFC 6113 section 5.1. The caller must preinitialize <em>output</em> and allocate the desired amount of space. The length of the pseudo-random output will match the length of <em>output</em> .</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>RFC 4402 defines a different PRF+ operation. This function does not implement that operation.</p>
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