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) {
				ETag, err := etag.Parse(object.ETag)
				if err != nil {
					continue
				}
				if ETag.IsEncrypted() {
					SSES3SinglePartObjects[i] = true