scripts/signrom: remove Python 2 support, add shebang

Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200204160028.16211-1-pbonzini@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>

diff --git a/scripts/signrom.py b/scripts/signrom.py
index 313ee28a17753171d9e34b19479199b9fba4adf4..9be5dab1cfb12ccbc70081fe171531b858e0d478 100644 (file)
--- a/scripts/signrom.py
+++ b/scripts/signrom.py
@@ -1,3 +1,5 @@
+#!/usr/bin/env python3
+
 from __future__ import print_function
 #
 # Option ROM signing utility
@@ -44,14 +46,8 @@ fout.write(data)
 
 checksum = 0
 for b in data:
-    # catch Python 2 vs. 3 differences
-    if isinstance(b, int):
-        checksum += b
-    else:
-        checksum += ord(b)
-checksum = (256 - checksum) % 256
-
-# Python 3 no longer allows chr(checksum)
+    checksum = (checksum - b) & 255
+
 fout.write(struct.pack('B', checksum))
 
 fin.close()