}
		return nil, errors.New("metadataEncryptFn: unexpected key size")
	}

	return nil, nil
}

// decryptChecksums will attempt to decode checksums and return it/them if set.
// if part > 0, and we have the checksum for the part that will be returned.
func (o *ObjectInfo) decryptChecksums(part int) map[string]string {
	data := o.Checksum
	if len(data) == 0 {
		return nil
	}

		if lc, err := globalLifecycleSys.Get(objInfo.Bucket); err == nil && !delete {
			lc.SetPredictionHeaders(w, objInfo.ToLifecycleOpts())
		}
	}
	hash.AddChecksumHeader(w, objInfo.decryptChecksums(0))
}

func deleteObjectVersions(ctx context.Context, o ObjectLayer, bucket string, toDel []ObjectToDelete, lcEvent lifecycle.Event) {
	for remaining := toDel; len(remaining) > 0; toDel = remaining {

}

// generates CompleteMultipartUploadResponse for given bucket, key, location and ETag.
func generateCompleteMultpartUploadResponse(bucket, key, location string, oi ObjectInfo) CompleteMultipartUploadResponse {
	cs := oi.decryptChecksums(0)
	c := CompleteMultipartUploadResponse{
		Location: location,
		Bucket:   bucket,
		Key:      key,
		// AWS S3 quotes the ETag in XML, make sure we are compatible here.

	}

	if r.Header.Get(xhttp.AmzChecksumMode) == "ENABLED" && rs == nil {
		// AWS S3 silently drops checksums on range requests.
		hash.AddChecksumHeader(w, objInfo.decryptChecksums(opts.PartNumber))
	}

	var buf *bytebufferpool.ByteBuffer
	if update {
		if globalCacheConfig.MatchesSize(objInfo.Size) {
			buf = bytebufferpool.Get()
			defer bytebufferpool.Put(buf)
		}