return k, nil
}

func (k *PrivateKeyECDH) PublicKey() (*PublicKeyECDH, error) {
	defer runtime.KeepAlive(k)

	group := C._goboringcrypto_EC_KEY_get0_group(k.key)
	if group == nil {
		return nil, fail("EC_KEY_get0_group")
	}
	kbig := C._goboringcrypto_EC_KEY_get0_private_key(k.key)
	if kbig == nil {
		return nil, fail("EC_KEY_get0_private_key")
	}
	pt := C._goboringcrypto_EC_POINT_new(group)
	if pt == nil {