powVartime method

Implementation

JubJubNativeFq powVartime(List<BigInt> by) {
  JubJubNativeFq res = JubJubNativeFq.one();
  for (BigInt e in by.reversed) {
    e = e.asU64;
    for (int i = 63; i >= 0; i--) {
      res = res.square();

      if (((e >> i) & BigInt.one) == BigInt.one) {
        res = res * this;
      }
    }
  }

  return res;
}