I have posted a patch to "GERONIMO-2413 Add a Certification Authority (CA) portlet to Geronimo console".  The patch contains CA portlet and CA Helper application.  JIRA comment provides a few instructions on  a minimal (end-to-end setup of CA and the helper application) task that can be performed using the portlet.  Please take time to review the patch, try the CA portlet and the helper application.

PS: JIRA also has patch for branches\1.1 .  This patch is only intended for those who want to try the portlet in 1.1.x.