if err != nil {
		return err
	}
	serializedOuter, err := outer.marshal()
	if err != nil {
		return err
	}
	serializedOuter = serializedOuter[4:] // strip the four byte prefix
	encryptedInner, err := ech.hpkeContext.Seal(serializedOuter, encodedInner)
	if err != nil {
		return err
	}