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<section id="krb5-c-derive-prfplus-derive-a-key-using-some-input-data-via-rfc-6113-prf">
<h1>krb5_c_derive_prfplus - Derive a key using some input data (via RFC 6113 PRF+).<a class="headerlink" href="#krb5-c-derive-prfplus-derive-a-key-using-some-input-data-via-rfc-6113-prf" title="Permalink to this headline">¶</a></h1>
<dl class="c function">
<dt class="sig sig-object c" id="c.krb5_c_derive_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_derive_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_enctype.html#c.krb5_enctype" title="krb5_enctype"><span class="n"><span class="pre">krb5_enctype</span></span></a><span class="w"> </span><span class="n"><span class="pre">enctype</span></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="p"><span class="pre">*</span></span><span class="n"><span class="pre">out</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.krb5_c_derive_prfplus" title="Permalink to this definition">¶</a><br /></dt>
<dd></dd></dl>
<dl class="field-list">
<dt class="field-odd">param</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 string</p>
<p><strong>[in]</strong> <strong>enctype</strong> - Output key enctype (or <strong>ENCTYPE_NULL</strong> )</p>
<p><strong>[out]</strong> <strong>out</strong> - Derived keyblock</p>
</dd>
</dl>
<p>This function uses PRF+ as defined in RFC 6113 to derive a key from another key and an input string. If <em>enctype</em> is <strong>ENCTYPE_NULL</strong> , the output key will have the same enctype as the input key.</p>
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