ilure.  The <code>argon2</code> algorithm <b>requires</b> 16 bytes of salt
data; lack of salt or the wrong amount will result in failure.

<p>
The <code>argon2</code> algorithm requires <code>libsodium-1.0.9</code> or
later.

<p>
<b>Logging</b><br>
The <code>mod_sql_passwd</code> module supports <a href="../howto/Tracing.html">trace logging</a>, via the module-specific log
channels:
<ul>
  <li>sql.passwd
</ul>
Thus for trace logging, to aid in debugging, you would use the following in
your <code>proftpd.con