Password used to generate certificate is not encrypted when stored in directory

<?xml version="1.0"?>
<component name="digital.signature.directory.override">
	<require>digital.signature.directory</require>
  <extension target="org.nuxeo.ecm.directory.sql.SQLDirectoryFactory"
    point="directories">

    <directory name="certificate">
      <schema>cert</schema>
      <dataSource>java:/nxsqldirectory</dataSource>
      <cacheTimeout>3600</cacheTimeout>
      <cacheMaxSize>1000</cacheMaxSize>
      <table>certificate</table>
      <idField>userid</idField>
      <passwordField>keypassword</passwordField>
      <passwordHashAlgorithm>SSHA</passwordHashAlgorithm>
      <autoincrementIdField>false</autoincrementIdField>
      <createTablePolicy>on_missing_columns</createTablePolicy>
    </directory>
  </extension>
</component>