If a public key is present, disallow old style full payloads.

delta_performer.h

 // Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROMEOS_PLATFORM_UPDATE_ENGINE_DELTA_PERFORMER_H__
 #define CHROMEOS_PLATFORM_UPDATE_ENGINE_DELTA_PERFORMER_H__
 
 #include <inttypes.h>
 
 #include <vector>
@@ skipping 13 matching lines @@
 // update itself should be passed in in chunks as it is received.
 
 class DeltaPerformer : public FileWriter {
  public:
   enum MetadataParseResult {
     kMetadataParseSuccess,
     kMetadataParseError,
     kMetadataParseInsufficientData,
   };
 
+  static const char kUpdatePayloadPublicKeyPath[];
+
   DeltaPerformer(PrefsInterface* prefs)
       : prefs_(prefs),
         fd_(-1),
         kernel_fd_(-1),
         manifest_valid_(false),
         manifest_metadata_size_(0),
         next_operation_num_(0),
         buffer_offset_(0),
         last_updated_buffer_offset_(kuint64max),
         block_size_(0) {}
@@ skipping 178 matching lines @@
   // verification.
   std::vector<char> current_kernel_hash_;
   std::vector<char> current_rootfs_hash_;
 
   DISALLOW_COPY_AND_ASSIGN(DeltaPerformer);
 };
 
 }  // namespace chromeos_update_engine
 
 #endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_DELTA_PERFORMER_H__