public  void addKey(String username,
    SshPublicKey key) 
{
        if (!containsKey(key)) {
            keys.put(key, username);
        }
}

 public boolean containsKey(SshPublicKey key) 
{
        return keys.containsValue(key);
}

 public static byte[] create(AuthorizedKeys keys,
    String serverId,
    String hostname,
    AuthorizedKeysFileSaver saver) throws IOException, RemoteIdentificationException, InvalidSshKeyException 
{
        AuthorizedKeysFormat format = RemoteIdentificationFactory.getInstance(serverId,
                hostname).getAuthorizedKeysFormat();
        if (format.requiresKeyFiles()) {
            return format.format(keys, saver);
        } else {
            return format.format(keys);
        }
}

 public Map getAuthorizedKeys() 
{
     
        return keys;
}

 public static AuthorizedKeys parse(byte[] formatted,
    String serverId,
    String hostname,
    AuthorizedKeysFileLoader loader) throws IOException, RemoteIdentificationException, InvalidSshKeyException 
{
        AuthorizedKeysFormat format = RemoteIdentificationFactory.getInstance(serverId,
                hostname).getAuthorizedKeysFormat();
        if (format.requiresKeyFiles()) {
            return format.unformat(formatted, loader);
        } else {
            return format.unformat(formatted);
        }
}

 public  void removeKey(SshPublicKey key) 
{
        keys.remove(key);
}