metadata = metadata[:0:N]
		buckets = buckets[:0:N]
		names = names[:0:N]
		SSES3SinglePartObjects := make(map[int]bool)
		for i, object := range batch {
			if kind, ok := crypto.IsEncrypted(object.UserDefined); ok && kind == crypto.S3 && !crypto.IsMultiPart(object.UserDefined) {
				SSES3SinglePartObjects[i] = true

				metadata = append(metadata, object.UserDefined)
				buckets = append(buckets, object.Bucket)