</p><p>
    When compiled against <span class="productname">OpenSSL</span> 3.0.0 and later
    versions, the legacy provider must be activated in the
    <code class="filename">openssl.cnf</code> configuration file in order to use older
    ciphers like DES or Blowfish.
   </p></div><div class="sect3" id="PGCRYPTO-NOTES-NULL-HANDLING"><div class="titlepage"><div><div><h4 class="title">F.28.6.2. NULL Handling <a href="#PGCRYPTO-NOTES-NULL-HANDLING" class="id_link">#</a></h4></div></div></div><p>
    As is s