func (curve CurveParams) IsOnCurve(x, y *big.Int) bool {
bnx := C.BN_new()
if bnx == nil {
return false
}
defer C.BN_free(bnx)
bny := C.BN_new()
if bny == nil {
return false
}
defer C.BN_free(bny)
xs := C.CString(x.String())
defer C.free(unsafe.Pointer(xs))
if C.BN_hex2bn(&bnx, xs) == 0 {
return false
}
ys := C.CString(y.String())
defer C.free(unsafe.Pointer(ys))
if C.BN_hex2bn(&bny, ys) == 0 {
return false
}
point := C.EC_POINT_new(curve.curve)
if point == nil {
return false
}
defer C.EC_POINT_free(point)
if C.EC_POINT_set_affine_coordinates_GFp(curve.curve, point, bnx, bny, nil) != 1 {
return false
}
if C.EC_POINT_is_on_curve(curve.curve, point, nil) == 0 {
return false
}
return true
}
func (p *point) Valid() bool {
return C.EC_POINT_is_on_curve(p.g, p.p, p.c.ctx) != 0
}