return nil, sio.NotAuthentic
	}
	return stream.DecryptReader(ciphertext, metadata.Nonce, nil), nil
}

type encryptedObject struct {
	KeyID  string `json:"keyid"`
	KMSKey []byte `json:"kmskey"`

	Algorithm sio.Algorithm `json:"algorithm"`
	Nonce     []byte        `json:"nonce"`

//     metadata:
//       - key: "content-type"
//         value: "image/*" # match objects with 'content-type', with all values starting with 'image/'
//     kmskey: "key-id" # match objects with KMS key-id (applicable only for sse-kms)
//   notify:
//     endpoint: "https://notify.endpoint" # notification endpoint to receive job status events

	if GlobalKMS == nil {
		return nil, errKMSNotConfigured
	}
	keyID, kmsKey, sealedKey, err := crypto.S3.ParseMetadata(meta)
	if err != nil {
		return nil, err
	}
	extKey, err := GlobalKMS.Decrypt(context.TODO(), &kms.DecryptRequest{
		Name:           keyID,
		Ciphertext:     kmsKey,
		AssociatedData: kmsContext,
	})
	if err != nil {
		return nil, err
	}

	switch kind {
	case crypto.S3:
		if GlobalKMS == nil {
			return errKMSNotConfigured
		}
		keyID, kmsKey, sealedKey, err := crypto.S3.ParseMetadata(metadata)
		if err != nil {
			return err
		}
		oldKey, err := GlobalKMS.Decrypt(ctx, &kms.DecryptRequest{
			Name:           keyID,
			Ciphertext:     kmsKey,
			AssociatedData: kms.Context{bucket: path.Join(bucket, object)},
		})
		if err != nil {
			return err