init method

@override void init(CipherParameters params)

Init the MAC with its initialization params. The type of CipherParameters depends on the algorithm being used (see the documentation of each implementation to find out more).

Implementation

@override
void init(CipherParameters params) {
  Uint8List? nonce;

  if (cipher != null) {
    if (params is! ParametersWithIV) {
      throw ArgumentError(
          'Poly1305 requires an IV when used with a block cipher.');
    }

    nonce = params.iv;
    params = params.parameters!;
  }

  if (params is! KeyParameter) {
    throw ArgumentError('Poly1305 requires a key.');
  }

  if (!checkKey(params.key)) clamp(params.key);

  setKey(params.key, nonce);

  reset();
}