# -*- coding: utf-8 -*-

from lightecc import LightECC
from lightecc import EllipticCurvePoint
import secrets
from hashlib import sha256

ec = LightECC(curve_name = "p256")
G = ec.G

def sha256int(s):
    return int.from_bytes(sha256(s.encode()).digest(), byteorder = "big")

def gen():
    d = secrets.randbits(256) % ec.n
    Q = d*G
    return d, Q

def sig2(m, d):
    k = sha256int(m + str(d)) % ec.n
    R = k*G
    r = sha256int(m + str(R.x)) % ec.n
    s = (k + r + d) % ec.n
    return R.x, s


d, Q = gen()

m = "hello"
rx, s = sig2(m, d)