VestaPoint.random constructor

Implementation

factory VestaPoint.random() {
  while (true) {
    final x = VestaFq.random();
    final ySign = QuickCrypto.nextU32() % 2;
    final x3 = x.square() * x;
    VestaFq? y = (x3 + PastaCurveParams.vesta.b).sqrt().sqrtOrNull();
    if (y == null) continue;
    if (y == VestaFq.fromBytes(y.toBytes())) {
      final sign = y.isOdd() ? 1 : 0;
      if ((ySign ^ sign) != 0) {
        y = -y;
      }
      return VestaAffinePoint(x: x, y: y).toCurve();
    }
  }
}