Function random [src]
Return a random scalar < L.
  Prototype
 pub fn random() Scalar  Source
 pub fn random() Scalar {
    var s: [64]u8 = undefined;
    while (true) {
        crypto.random.bytes(&s);
        const n = Scalar.fromBytes64(s);
        if (!n.isZero()) {
            return n;
        }
    }
}