private boolean markKeyInvalid(int seq){
  checkLoaded();
  AccountSshKey key=getKey(seq);
  if (key != null && key.isValid()) {
    key.setInvalid();
    return true;
  }
  return false;
}

private boolean markKeyInvalid ( int seq ) { checkLoaded ( ) ; AccountSshKey key = getKey ( seq ) ; if ( key != null && key . isValid ( ) ) { key . setInvalid ( ) ; return true ; } return false ; }
marks the ssh key with the given sequence number as invalid .
