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  <div class="section" id="krb5-k-make-checksum-iov-fill-in-a-checksum-element-in-iov-array-operates-on-opaque-key">
<h1>krb5_k_make_checksum_iov -  Fill in a checksum element in IOV array (operates on opaque key)<a class="headerlink" href="#krb5-k-make-checksum-iov-fill-in-a-checksum-element-in-iov-array-operates-on-opaque-key" title="Permalink to this headline">¶</a></h1>
<dl class="function">
<dt id="c.krb5_k_make_checksum_iov">
<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_make_checksum_iov</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_cksumtype.html#c.krb5_cksumtype" title="krb5_cksumtype">krb5_cksumtype</a><em>&nbsp;cksumtype</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>, <a class="reference internal" href="../types/krb5_crypto_iov.html#c.krb5_crypto_iov" title="krb5_crypto_iov">krb5_crypto_iov</a> *<em>&nbsp;data</em>, size_t<em>&nbsp;num_data</em><big>)</big><a class="headerlink" href="#c.krb5_k_make_checksum_iov" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>

<table class="docutils field-list" frame="void" rules="none">
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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>cksumtype</strong> - Checksum type (0 for mandatory type)</p>
<p><strong>[in]</strong> <strong>key</strong> - Encryption key for a keyed checksum</p>
<p><strong>[in]</strong> <strong>usage</strong> - Key usage (see <tt class="xref py py-data docutils literal"><span class="pre">KRB5_KEYUSAGE</span></tt> types)</p>
<p><strong>[inout]</strong> <strong>data</strong> - IOV array</p>
<p class="last"><strong>[in]</strong> <strong>num_data</strong> - Size of <em>data</em></p>
</td>
</tr>
</tbody>
</table>
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<col class="field-name" />
<col class="field-body" />
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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>
</tbody>
</table>
<p>Create a checksum in the <a class="reference internal" href="../macros/KRB5_CRYPTO_TYPE_CHECKSUM.html#KRB5_CRYPTO_TYPE_CHECKSUM" title="KRB5_CRYPTO_TYPE_CHECKSUM"><tt class="xref py py-data docutils literal"><span class="pre">KRB5_CRYPTO_TYPE_CHECKSUM</span></tt></a> element over <a class="reference internal" href="../macros/KRB5_CRYPTO_TYPE_DATA.html#KRB5_CRYPTO_TYPE_DATA" title="KRB5_CRYPTO_TYPE_DATA"><tt class="xref py py-data docutils literal"><span class="pre">KRB5_CRYPTO_TYPE_DATA</span></tt></a> and <a class="reference internal" href="../macros/KRB5_CRYPTO_TYPE_SIGN_ONLY.html#KRB5_CRYPTO_TYPE_SIGN_ONLY" title="KRB5_CRYPTO_TYPE_SIGN_ONLY"><tt class="xref py py-data docutils literal"><span class="pre">KRB5_CRYPTO_TYPE_SIGN_ONLY</span></tt></a> chunks in <em>data</em> . Only the <a class="reference internal" href="../macros/KRB5_CRYPTO_TYPE_CHECKSUM.html#KRB5_CRYPTO_TYPE_CHECKSUM" title="KRB5_CRYPTO_TYPE_CHECKSUM"><tt class="xref py py-data docutils literal"><span class="pre">KRB5_CRYPTO_TYPE_CHECKSUM</span></tt></a> region is modified.</p>
<div class="admonition seealso">
<p class="first admonition-title">See also</p>
<p class="last"><a class="reference internal" href="krb5_k_verify_checksum_iov.html#c.krb5_k_verify_checksum_iov" title="krb5_k_verify_checksum_iov"><tt class="xref c c-func docutils literal"><span class="pre">krb5_k_verify_checksum_iov()</span></tt></a></p>
</div>
<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_make_checksum_iov.html#c.krb5_c_make_checksum_iov" title="krb5_c_make_checksum_iov"><tt class="xref c c-func docutils literal"><span class="pre">krb5_c_make_checksum_iov()</span></tt></a> , but operates on opaque <em>key</em> .</p>
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