tandard in SQL, all functions return NULL, if any of the arguments
    are NULL.  This may create security risks on careless usage.
   </p></div><div class="sect3" id="PGCRYPTO-NOTES-SEC-LIMITS"><div class="titlepage"><div><div><h4 class="title">F.28.6.3. Security Limitations <a href="#PGCRYPTO-NOTES-SEC-LIMITS" class="id_link">#</a></h4></div></div></div><p>
    All <code class="filename">pgcrypto</code> functions run inside the database server.
    That means that all
    the data and passwords move betw