// object into parts in PutObject()
	return len(o.ETag) != 32
}

// ParseSSECopyCustomerRequest parses the SSE-C header fields of the provided request.
// It returns the client provided key on success.
func ParseSSECopyCustomerRequest(h http.Header, metadata map[string]string) (key []byte, err error) {
	if crypto.S3.IsEncrypted(metadata) && crypto.SSECopy.IsRequested(h) {

	// - the object storage class is not changing
	// then execute a key rotation.
	if cpSrcDstSame && (sseCopyC && sseC) && !chStorageClass {
		oldKey, err = ParseSSECopyCustomerRequest(r.Header, srcInfo.UserDefined)
		if err != nil {
			writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
			return
		}

		for k, v := range srcInfo.UserDefined {