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 {