if err != nil {
		return key, err
	}
	err = key.Unseal(clientKey, sealedKey, SSEC.String(), bucket, object)
	return key, err
}

// EncryptSinglePart encrypts an io.Reader which must be the
// body of a single-part PUT request.
func EncryptSinglePart(r io.Reader, key ObjectKey) io.Reader {
	r, err := sio.EncryptReader(r, sio.Config{MinVersion: sio.Version20, Key: key[:]})
	if err != nil {