byte[] getPrivacyPasswordKeySHA1() {
   if (userPrivKeySHA1 == null) {
     userPrivKeySHA1 = SnmpUtilities.passwordToKeySHA1(userPrivacyPassword);
   }
   return userPrivKeySHA1;
 }
 byte[] getAuthenticationPasswordKeySHA1() {
   if (userAuthKeySHA1 == null) {
     userAuthKeySHA1 = SnmpUtilities.passwordToKeySHA1(userAuthenticationPassword);
   }
   return userAuthKeySHA1;
 }