nt</span></code> if the argument is not exactly 16 bytes.</p>
</div>
</div>

<pre><span id="VALfrom_hex"><span class="keyword">val</span> from_hex</span> : <code class="type">string -&gt; <a href="Digest.html#TYPEt">t</a></code></pre><div class="info ">
<div class="info-desc">
<p>Convert a hexadecimal representation back into the corresponding digest.
   Raise <code class="code"><span class="constructor">Invalid_argument</span></code> if the argument is not exactly 32 hexadecimal
   characters.</p>
</div>
<