File file = new File(USER_HASH_FILE);
if (!file.exists()) return ;
FileChannel input_channel = new FileInputStream(file).getChannel();
ByteBuffer hash = Misc.getByteBuffer(16);
input_channel.read(hash);
user_hash = new UserHash(hash.array());
input_channel.close();
}
private void storeClientID() throws Throwable {
FileChannel output_channel = new FileOutputStream(KAD_ID_FILE).getChannel();