byte[] getPrivacyPasswordKeyMD5() {
   if (userPrivKeyMD5 == null) {
     userPrivKeyMD5 = SnmpUtilities.passwordToKeyMD5(userPrivacyPassword);
   }
   return userPrivKeyMD5;
 }
 byte[] getAuthenticationPasswordKeyMD5() {
   if (userAuthKeyMD5 == null) {
     userAuthKeyMD5 = SnmpUtilities.passwordToKeyMD5(userAuthenticationPassword);
   }
   return userAuthKeyMD5;
 }