compress method

CompressedEdwardsY compress()

Implementation

CompressedEdwardsY compress() {
  final FieldElement r = _z.invert();
  final FieldElement x = _x * r;
  final FieldElement y = _y * r;
  final List<int> s = y.toByteArray();
  s[31] |= x.isNegative() << 7;
  return CompressedEdwardsY(s);
}