* given its object identifier
*
* @returns null if the CertificateExtension doesn't exist
*/
public CertificateExtension getStandardCertificateExtension(String oid, CertificateProfile certProf){
StandardCertificateExtension ret = null;
String classPath = (String)standardCertificateExtensions.get(oid);
if (classPath != null) {
try {
Class<?> implClass = Class.forName(classPath);
ret = (StandardCertificateExtension)implClass.newInstance();
ret.init(certProf);
} catch (ClassNotFoundException e) {
log.error(intres.getLocalizedMessage("certext.noextensionforid", oid), e);
} catch (InstantiationException e) {
log.error(intres.getLocalizedMessage("certext.noextensionforid", oid), e);
} catch (IllegalAccessException e) {