reset method
void
reset()
Implementation
void reset() {
_bufferPos = 0;
_f0 = Int64.fromInts(0, 0);
_t0 = Int64.fromInts(0, 0);
_t1 = Int64.fromInts(0, 0);
_chainValue = null;
_buffer.fillRange(0, _buffer.length, 0);
if (_key != null) {
_buffer.addAll(_key!);
_bufferPos = Const.blockLengthBytes; // zero padding
}
init();
}