Exemple #1
0
func (p *point) Base() abstract.Point {
	genp := C.EC_GROUP_get0_generator(p.c.g)
	if genp == nil {
		panic("EC_GROUP_get0_generator: " + getErrString())
	}
	if C.EC_POINT_copy(p.p, genp) == 0 {
		panic("EC_POINT_copy: " + getErrString())
	}
	return p
}
Exemple #2
0
func buildCurveParams(curve *C.EC_GROUP) *elliptic.CurveParams {
	cp := &elliptic.CurveParams{}
	// handle go < 1.5
	// Name wasn't in CurveParams before
	elem := reflect.ValueOf(cp).Elem()
	f := elem.FieldByName("Name")
	if f.IsValid() {
		f.SetString(getCurveName(curve))
	}
	cp.BitSize = getCurveBitSize(curve)

	p := C.BN_new()
	if p == nil {
		panic(sslerr.SSLErrorMessage().String())
	}
	defer C.BN_free(p)
	a := C.BN_new()
	if a == nil {
		panic(sslerr.SSLErrorMessage().String())
	}
	defer C.BN_free(a)
	b := C.BN_new()
	if b == nil {
		panic(sslerr.SSLErrorMessage().String())
	}
	defer C.BN_free(b)

	if C.EC_GROUP_get_curve_GFp(curve, p, a, b, nil) != 1 {
		panic(sslerr.SSLErrorMessage().String())
	}
	if p == nil || a == nil || b == nil {
		panic("something went wrong getting GFp params")
	}
	cp.P, _ = new(big.Int).SetString(C.GoString(C.BN_bn2dec(p)), 10)
	cp.N, _ = new(big.Int).SetString(C.GoString(C.BN_bn2dec(a)), 10)
	cp.B, _ = new(big.Int).SetString(C.GoString(C.BN_bn2hex(b)), 16)

	generator := C.EC_GROUP_get0_generator(curve)
	if generator == nil {
		panic("generator cannot be nil")
	}
	x := C.BN_new()
	if x == nil {
		panic(sslerr.SSLErrorMessage().String())
	}
	defer C.BN_free(x)
	y := C.BN_new()
	if y == nil {
		panic(sslerr.SSLErrorMessage().String())
	}
	defer C.BN_free(y)
	if C.EC_POINT_get_affine_coordinates_GFp(curve, generator, x, y, nil) != 1 {
		panic(sslerr.SSLErrorMessage().String())
	}
	if x == nil || y == nil {
		panic("something went wrong getting affine coordinates")
	}
	cp.Gx, _ = new(big.Int).SetString(C.GoString(C.BN_bn2hex(x)), 16)
	cp.Gy, _ = new(big.Int).SetString(C.GoString(C.BN_bn2hex(y)), 16)

	return cp
}