an>, that is, it can be
  installed by non-superusers who have <code class="literal">CREATE</code> privilege
  on the current database.
 </p><p>
  <code class="filename">pgcrypto</code> requires OpenSSL and won't be installed if
  OpenSSL support was not selected when PostgreSQL was built.
 </p><div class="sect2" id="PGCRYPTO-GENERAL-HASHING-FUNCS"><div class="titlepage"><div><div><h3 class="title">F.28.1. General Hashing Functions <a href="#PGCRYPTO-GENERAL-HASHING-FUNCS" class="id_link">#</a></h3></div><