ot provided or if a provided
value is incorrect. This includes <em>hmac_key</em>, unless <em>hmac</em>
is set to FALSE.</p>
</div>
</div>
<div class="section" id="supported-hmac-authentication-algorithms">
<span id="digests"></span><h4><a class="toc-backref" href="#id15">Supported HMAC authentication algorithms</a><a class="headerlink" href="#supported-hmac-authentication-algorithms" title="Permalink to this headline">¶</a></h4>
<p>For HMAC message authentication, the Encryption library supports
usage of t