account.py 文件源码

def _derive_y_from_x(self, x, is_even):
        """ Derive y point from x point """
        curve = ecdsa.SECP256k1.curve
        # The curve equation over F_p is:
        #   y^2 = x^3 + ax + b
        a, b, p = curve.a(), curve.b(), curve.p()
        alpha = (pow(x, 3, p) + a * x + b) % p
        beta = ecdsa.numbertheory.square_root_mod_prime(alpha, p)
        if (beta % 2) == is_even:
            beta = p - beta
        return beta