="custom-OSSL_MAC_PARAM_CUSTOM-octet-string">&quot;custom&quot; (<b>OSSL_MAC_PARAM_CUSTOM</b>) &lt;octet string&gt;</dt>
<dd>

<p>Some MAC implementations (KMAC, BLAKE2) accept a Customization String, this parameter sets the Customization String. The default value is the empty string.</p>

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

<p>This option is used by BLAKE2 MAC.</p>

</dd>
<dt id="xof-OSSL_MAC_PARAM_XOF-integer">&