add method

@override void add(List<int> data)

Adds data to the sink.

Must not be called after a call to close.

Implementation

@override
void add(List<int> data) {
  final bs = _cipher.blockSize;

  // Deal with any pending bytes
  var fromPos = 0;
  {
    final total = _lastPlaintextPos + data.length;
    if (total < bs) {
      _lastPlaintext.setRange(_lastPlaintextPos, total, data);
      _lastPlaintextPos = total;
      return;
    }
    _lastPlaintext.setRange(_lastPlaintextPos, bs, data);
    _emit(_lastPlaintext, 0, bs);
    fromPos = bs - _lastPlaintextPos;
  }

  if (fromPos == data.length) {
    _lastPlaintextPos = 0;
    return; // No more to do
  }

  final toEmit = ((data.length - fromPos) ~/ bs) * bs;
  _emit(data, fromPos, toEmit);
  fromPos += toEmit;

  _lastPlaintextPos = data.length - fromPos;
  if (_lastPlaintextPos > 0) {
    _lastPlaintext.setRange(0, _lastPlaintextPos,
        data.getRange(fromPos, fromPos + _lastPlaintextPos));
  } else {
    // Keep the last block of plaintext around, in case we need it
    // to generate the padding.  See Padding.addPadding() in Pointycastle.
    _lastPlaintext.setRange(
        0, bs, data.getRange(data.length - bs, data.length));
  }
}