curve string
	key   *C.GO_EC_KEY
}

func (k *PrivateKeyECDH) finalize() {
	C._goboringcrypto_EC_KEY_free(k.key)
}

func NewPublicKeyECDH(curve string, bytes []byte) (*PublicKeyECDH, error) {
	if len(bytes) < 1 {
		return nil, errors.New("NewPublicKeyECDH: missing key")
	}

	nid, err := curveNID(curve)
	if err != nil {
		return nil, err
	}

func GenerateKeyECDH(string) (*PrivateKeyECDH, []byte, error)   { panic("boringcrypto: not available") }
func NewPrivateKeyECDH(string, []byte) (*PrivateKeyECDH, error) { panic("boringcrypto: not available") }
func NewPublicKeyECDH(string, []byte) (*PublicKeyECDH, error)   { panic("boringcrypto: not available") }
func (*PublicKeyECDH) Bytes() []byte                            { panic("boringcrypto: not available") }

		return nil, errors.New("crypto/ecdh: invalid public key")
	}
	k := &PublicKey{
		curve:     c,
		publicKey: append([]byte{}, key...),
	}
	if boring.Enabled {
		bk, err := boring.NewPublicKeyECDH(c.name, k.publicKey)
		if err != nil {
			return nil, err
		}
		k.boring = bk
	} else {
		// SetBytes also checks that the point is on the curve.
		if _, err := c.newPoint().SetBytes(key); err != nil {