Record Code Signature of Downloaded DMG files

components/safe_browsing/csd.proto

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // This proto file includes:
 // (1) Client side phishing and malware detection request and response
 //   protocol buffers.  Those protocol messages should be kept in sync
 //   with the server implementation.
 //
 // (2) Safe Browsing reporting protocol buffers.
@@ skipping 503 matching lines @@
   repeated string alternate_extensions = 35;
 
   // URLs transitions from landing referrer to download in reverse chronological
   // order, i.e. download url comes first in this list, and landing referrer
   // comes last.
   repeated ReferrerChainEntry referrer_chain = 36;
 
   // Deprecated.
   optional bool DEPRECATED_download_attribution_finch_enabled = 39
       [deprecated = true];
+
+  // The Mac disk image code signature.
+  // The underlying structure of code signature is defined at
+  // https://opensource.apple.com/source/xnu/xnu-2782.1.97/bsd/sys/codesign.h
+  optional bytes udif_code_signature = 40;
 }
 
 // Please update SafeBrowsingNavigationObserverManager::SanitizeReferrerChain()
 // if you're adding more fields to this message.
 message ReferrerChainEntry {
   enum URLType {
     // URL of safe browsing events that are at the end of the referrer chain.
     // e.g. URL of a download, URL of a low reputation login page, etc.
     EVENT_URL = 1;  // e.g.
 
@@ skipping 546 matching lines @@
 // There is no response (an empty body) to this request.
 message NotificationImageReportRequest {
   optional string notification_origin = 1;  // Src-origin of the notification.
   optional ImageData image = 2;             // The bitmap of the image.
 
   // Note that the image URL is deliberately omitted as it would be untrusted,
   // since the notification image fetch may be intercepted by a Service Worker
   // (even if the image URL is cross-origin). Otherwise a website could mislead
   // Safe Browsing into associating phishing image bitmaps with safe image URLs.
 }