pointAtIndex method

Implementation

@override
PastaAffinePoint<VestaFq, PallasFp, PallasPoint> pointAtIndex(int index) {
  final r = _sinsemillaS.elementAtOrNull(index);
  if (r == null) {
    throw CryptoException.failed(
      "pointAtIndex",
      reason: "Missing sinsemillaS point at index $index",
    );
  }
  return r;
}