}

// Seal encrypts the ObjectKey using the 256 bit external key and IV. The sealed
// key is also cryptographically bound to the object's path (bucket/object) and the
// domain (SSE-C or SSE-S3).
func (key ObjectKey) Seal(extKey []byte, iv [32]byte, domain, bucket, object string) SealedKey {
	if len(extKey) != 32 {
		logger.CriticalIf(context.Background(), errors.New("crypto: invalid key length"))
	}
	var (
		sealingKey   [32]byte