public static bool secp256k1_ge_set_xo_var(Ge r, Fe x, bool odd)
{
if (!Group.secp256k1_ge_set_xquad(r, x))
{
return(false);
}
Field.NormalizeVar(r.Y);
if (Field.IsOdd(r.Y) != odd)
{
Field.Negate(r.Y, r.Y, 1U);
}
return(true);
}