return b.Bytes()
}

func computeAndUpdateOuterECHExtension(outer, inner *clientHelloMsg, ech *echContext, useKey bool) error {
	var encapKey []byte
	if useKey {
		encapKey = ech.encapsulatedKey
	}
	encodedInner, err := encodeInnerClientHello(inner, int(ech.config.MaxNameLength))
	if err != nil {
		return err
	}