f</code>:
<pre>
  TraceLog /path/to/ftpd/trace.log
  Trace sql.passwd:20
</pre>
This trace logging can generate large files; it is intended for debugging use
only, and should be removed from any production configuration.

<p><a name="Transformations">
<b>Processing of Password and Salt Data</b><br>
The logical description of the processing that <code>mod_sql_passwd</code>
does can be expressed as:
<pre>
  ENCODE(HASH(<i>data</i>))
</pre>
where <em>data</em> is comprised of the password, and possibly a salt.