n class="p">,</span>
                <span class="s1">&#39;hmac_digest&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;sha256&#39;</span><span class="p">,</span>
                <span class="s1">&#39;hmac_key&#39;</span> <span class="o">=&gt;</span> <span class="nv">$hmac_key</span>
        <span class="p">)</span>
<span class="p">);</span>
</pre></div>
</div>
<p>In the above example, we are decrypting a message that was encrypted
using the Blowfish cipher in CBC mode and authenticated via a 