Update cmd/timestamp-cli/app/verify.go

Co-authored-by: Bob Callaway <bobcallaway@users.noreply.github.com>
Signed-off-by: Hector Fernandez <hector@chainguard.dev>

cmd/timestamp-cli/app/verify.go

@@ -136,18 +136,8 @@ func verifyArtifactWithTSR(ts *timestamp.Timestamp) error {
 
 func verifyHashedMessages(hashAlg hash.Hash, hashedMessage []byte, artifactReader io.Reader) error {
 	h := hashAlg
-
-	b := make([]byte, h.Size())
-	for {
-		n, err := artifactReader.Read(b)
-		if err == io.EOF {
-			break
-		}
-
-		_, err = h.Write(b[:n])
-		if err != nil {
-			return fmt.Errorf("failed to create hash %w", err)
-		}
+	if _, err := io.Copy(h, artifactReader); err != nil {
+		return fmt.Errorf("failed to create hash %w", err)
 	}
 	localHashedMsg := h.Sum(nil)