if len(cmetadata) != 0 {
		if err := json.Unmarshal(cmetadata, &meta); err != nil {
			return nil, err
		}
		if crypto.S3.IsEncrypted(meta) {
			if data, err = decryptBucketMetadata(cdata, bucket, meta, kms.Context{
				bucket:            bucket,
				bucketTargetsFile: bucketTargetsFile,
			}); err != nil {
				return nil, err
			}
		}
	}

	}
	metabytes, err = json.Marshal(metadata)
	if err != nil {
		return
	}
	return outbuf.Bytes(), metabytes, nil
}

// decrypt bucket metadata if kms is configured.
func decryptBucketMetadata(input []byte, bucket string, meta map[string]string, kmsContext kms.Context) ([]byte, error) {
	if GlobalKMS == nil {
		return nil, errKMSNotConfigured
	}
	keyID, kmsKey, sealedKey, err := crypto.S3.ParseMetadata(meta)