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  <div class="section" id="krb5-k-verify-checksum-verify-a-checksum-operates-on-opaque-key">
<h1>krb5_k_verify_checksum -  Verify a checksum (operates on opaque key).<a class="headerlink" href="#krb5-k-verify-checksum-verify-a-checksum-operates-on-opaque-key" title="Permalink to this headline"></a></h1>
<dl class="function">
<dt id="c.krb5_k_verify_checksum">
<a class="reference internal" href="../types/krb5_error_code.html#c.krb5_error_code" title="krb5_error_code">krb5_error_code</a> <tt class="descname">krb5_k_verify_checksum</tt><big>(</big><a class="reference internal" href="../types/krb5_context.html#c.krb5_context" title="krb5_context">krb5_context</a><em>&nbsp;context</em>, <a class="reference internal" href="../types/krb5_key.html#c.krb5_key" title="krb5_key">krb5_key</a><em>&nbsp;key</em>, <a class="reference internal" href="../types/krb5_keyusage.html#c.krb5_keyusage" title="krb5_keyusage">krb5_keyusage</a><em>&nbsp;usage</em>, const <a class="reference internal" href="../types/krb5_data.html#c.krb5_data" title="krb5_data">krb5_data</a> *<em>&nbsp;data</em>, const <a class="reference internal" href="../types/krb5_checksum.html#c.krb5_checksum" title="krb5_checksum">krb5_checksum</a> *<em>&nbsp;cksum</em>, <a class="reference internal" href="../types/krb5_boolean.html#c.krb5_boolean" title="krb5_boolean">krb5_boolean</a> *<em>&nbsp;valid</em><big>)</big><a class="headerlink" href="#c.krb5_k_verify_checksum" title="Permalink to this definition"></a></dt>
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<tr class="field-odd field"><th class="field-name">param:</th><td class="field-body"><p class="first"><strong>[in]</strong> <strong>context</strong> - Library context</p>
<p><strong>[in]</strong> <strong>key</strong> - Encryption key for a keyed checksum</p>
<p><strong>[in]</strong> <strong>usage</strong> - <em>key</em> usage</p>
<p><strong>[in]</strong> <strong>data</strong> - Data to be used to compute a new checksum using <em>key</em> to compare <em>cksum</em> against</p>
<p><strong>[in]</strong> <strong>cksum</strong> - Checksum to be verified</p>
<p class="last"><strong>[out]</strong> <strong>valid</strong> - Non-zero for success, zero for failure</p>
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<tr class="field-odd field"><th class="field-name">retval:</th><td class="field-body"><ul class="first last simple">
<li>0   Success; otherwise - Kerberos error codes</li>
</ul>
</td>
</tr>
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</table>
<p>This function verifies that <em>cksum</em> is a valid checksum for <em>data</em> . If the checksum type of <em>cksum</em> is a keyed checksum, <em>key</em> is used to verify the checksum. If the checksum type in <em>cksum</em> is 0 and <em>key</em> is not NULL, the mandatory checksum type for <em>key</em> will be used. The actual checksum key will be derived from <em>key</em> and <em>usage</em> if key derivation is specified for the checksum type.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">This function is similar to <a class="reference internal" href="krb5_c_verify_checksum.html#c.krb5_c_verify_checksum" title="krb5_c_verify_checksum"><tt class="xref c c-func docutils literal"><span class="pre">krb5_c_verify_checksum()</span></tt></a> , but operates on opaque <em>key</em> .</p>
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