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<section id="krb5-c-verify-checksum-verify-a-checksum-operates-on-keyblock">
<h1>krb5_c_verify_checksum - Verify a checksum (operates on keyblock).<a class="headerlink" href="#krb5-c-verify-checksum-verify-a-checksum-operates-on-keyblock" title="Link to this heading">¶</a></h1>
<dl class="c function">
<dt class="sig sig-object c" id="c.krb5_c_verify_checksum">
<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_verify_checksum</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">key</span></span>, <a class="reference internal" href="../types/krb5_keyusage.html#c.krb5_keyusage" title="krb5_keyusage"><span class="n"><span class="pre">krb5_keyusage</span></span></a><span class="w"> </span><span class="n"><span class="pre">usage</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">data</span></span>, <span class="k"><span class="pre">const</span></span><span class="w"> </span><a class="reference internal" href="../types/krb5_checksum.html#c.krb5_checksum" title="krb5_checksum"><span class="n"><span class="pre">krb5_checksum</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">cksum</span></span>, <a class="reference internal" href="../types/krb5_boolean.html#c.krb5_boolean" title="krb5_boolean"><span class="n"><span class="pre">krb5_boolean</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">valid</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.krb5_c_verify_checksum" 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>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><strong>[out]</strong> <strong>valid</strong> - Non-zero for success, zero for failure</p>
</dd>
</dl>
<dl class="field-list simple">
<dt class="field-odd">retval<span class="colon">:</span></dt>
<dd class="field-odd"><ul class="simple">
<li><p>0 Success; otherwise - Kerberos error codes</p></li>
</ul>
</dd>
</dl>
<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="admonition-title">Note</p>
<p>This function is similar to krb5_k_verify_checksum(), but operates on keyblock <em>key</em> .</p>
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