KEY-octet-string">&quot;key&quot; (<b>OSSL_MAC_PARAM_KEY</b>) &lt;octet string&gt;</dt>
<dd>

<p>Its value is the MAC key as an array of bytes.</p>

<p>For MACs that use an underlying computation algorithm, the algorithm must be set first, see parameter names &quot;algorithm&quot; below.</p>

</dd>
<dt id="iv-OSSL_MAC_PARAM_IV-octet-string">&quot;iv&quot; (<b>OSSL_MAC_PARAM_IV</b>) &lt;octet string&gt;</dt>
<dd>

<p>Some MAC implementations (GMAC) require an IV, this parameter sets the IV.</p>

</dd>
<dt id