var found *ObjectPartInfo
		for _, pinfo := range pinfos {
			if pinfo == nil {
				continue
			}
			if maxETag != "" && pinfo.ETag == maxETag {
				found = pinfo
				break
			}
			if pinfo.ETag == "" && maxPartMeta != "" && path.Base(maxPartMeta) == fmt.Sprintf("part.%d.meta", pinfo.Number) {
				found = pinfo
				break
			}
		}

		if err != nil {
			return setRestoreHeaderFn(oi, err)
		}
		pInfo, err := er.PutObjectPart(ctx, bucket, object, res.UploadID, partInfo.Number, NewPutObjReader(hr), ObjectOptions{})
		if err != nil {
			return setRestoreHeaderFn(oi, err)
		}
		if pInfo.Size != partInfo.Size {
			return setRestoreHeaderFn(oi, InvalidObjectState{Bucket: bucket, Object: object})
		}

		startOffset int64, length int64, srcInfo ObjectInfo, srcOpts, dstOpts ObjectOptions) (info PartInfo, err error)
	PutObjectPart(ctx context.Context, bucket, object, uploadID string, partID int, data *PutObjReader, opts ObjectOptions) (info PartInfo, err error)
	GetMultipartInfo(ctx context.Context, bucket, object, uploadID string, opts ObjectOptions) (info MultipartInfo, err error)

		if err != nil {
			writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
			return
		}
		reader = etag.Wrap(encReader, reader)

		wantSize := int64(-1)
		if length >= 0 {
			info := ObjectInfo{Size: length}
			wantSize = info.EncryptedSize()
		}

		srcInfo.Reader, err = hash.NewReader(ctx, reader, wantSize, "", "", actualPartSize)
		if err != nil {
			writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)

		if err != nil {
			writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
			return
		}

		wantSize := int64(-1)
		if size >= 0 {
			info := ObjectInfo{Size: size}
			wantSize = info.EncryptedSize()
		}

		// do not try to verify encrypted content
		hashReader, err = hash.NewReader(ctx, etag.Wrap(reader, hashReader), wantSize, "", "", actualSize)
		if err != nil {