digest method

List<int> digest()

Computes and returns the Poly1305 message authentication code (MAC) for the current state.

This method finalizes the Poly1305 authentication and produces the authentication code (MAC) based on the current state of the instance. After calling this method, further updates or finishing operations are not allowed.

Returns: A List<int> containing the computed Poly1305 message authentication code (MAC).

Throws:

• StateError if the Poly1305 instance was already finished before calling digest.

This method is used to obtain the final MAC from the current Poly1305 state, and it should not be called after the Poly1305 instance has been finished.

Implementation

List<int> digest() {
  if (_finished) {
    throw const MessageException("Poly1305 was finished");
  }
  List<int> mac = List<int>.filled(16, 0);
  finish(mac);
  return mac;
}