process method
Process a whole block of blockSize bytes stored in data
at once, returning the result in a
byte array.
This call is equivalent to processBlock but it allocates the array under the hood.
Implementation
@override
Uint8List process(Uint8List data) {
var out = Uint8List(blockSize);
var len = processBlock(data, 0, out, 0);
return out.sublist(0, len);
}