if KMS == nil {
			return nil, errKMSNotConfigured
		}
		objectKey, err := crypto.S3.UnsealObjectKey(KMS, metadata, bucket, object)
		if err != nil {
			return nil, err
		}
		return objectKey[:], nil
	case crypto.S3KMS:
		if GlobalKMS == nil {
			return nil, errKMSNotConfigured
		}
		objectKey, err := crypto.S3KMS.UnsealObjectKey(GlobalKMS, metadata, bucket, object)
		if err != nil {
			return nil, err
		}