func main() {
// Generate pseudorandom bytes using Dual_EC_DRBG on NIST Curve-256.
// NB: Never, ever use this generator. It is ridiculously slow, demonstrates bias
// and for the provided values of Q is backdoored by the NSA.
// The seed s is the value of S *after* seeding the OpenSSL implementation.
// Any integer on the order of 2^256 will suffice.
// @TODO: Have compatible seeding routines with OpenSSL.
s := ec.NewBigInt("14611F02F7F34E6121433EFB0D71ECAC38F28BE4274B3DD784D2C1D4BE78DF89", 16)
curve := ec.NewP256Curve()
g := pnc.NewDualECDRBG(
curve,
ec.NewBigInt(dual_ec_drbg_curve_p256_qx, 16),
ec.NewBigInt(dual_ec_drbg_curve_p256_qy, 16),
s)
for i := 0; i < 10; i++ {
fmt.Printf("%x", g.Bytes(600))
}
fmt.Println()
}
func main() {
curve := ec.NewP256Curve()
p := curve.G.Copy()
t := big.NewInt(0)
t.SetString("05ABA71EB402603B7D24D9F921E49433A69AB3DB2D5A9910FF040FA906207587", 16)
// ----------------
fmt.Println("Before:")
p.Print()
r := curve.ScalarMultiply(t, p)
fmt.Println("After:")
r.Print()
fmt.Printf("Expected:\n- x = %X\n- y = %X\n- on curve: %t\n",
ec.NewBigInt("7FDA41915769256A2D8F968BC9897849FC44C5CA64CF03E576EAF95E5FF9A799", 16),
ec.NewBigInt("D7E013E76E4CEDCEB49F8C267164954F0D57C3FD077B0A81DF4DDA5AF4D5868D", 16),
true)
}
func main() {
curve := ec.NewPrimeCurve(
ec.NewBigInt(curve_p256_p, 10),
ec.NewBigInt(curve_p256_a, 10),
ec.NewBigInt(curve_p256_b, 16),
ec.NewBigInt(curve_p256_gx, 16),
ec.NewBigInt(curve_p256_gy, 16),
ec.NewBigInt(curve_p256_n, 10),
ec.NewBigInt(curve_p256_h, 10))
p := curve.G.Copy()
fmt.Println("Before:")
p.Print()
r := curve.Add(p, p)
fmt.Println("After:")
r.Print()
}