Remove Windows XP SHA-256 and ECDSA logic.

components/component_updater/configurator_impl.cc

 // Copyright 2014 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.
 
 #include "components/component_updater/configurator_impl.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 
@@ skipping 41 matching lines @@
 const char kSwitchDisableBackgroundDownloads[] = "disable-background-downloads";
 #endif  // defined(OS_WIN)
 
 // Returns true if and only if |test| is contained in |vec|.
 bool HasSwitchValue(const std::vector<std::string>& vec, const char* test) {
   if (vec.empty())
     return 0;
   return (std::find(vec.begin(), vec.end(), test) != vec.end());
 }
 
-// Returns true if falling back on an alternate, unsafe, service URL is
-// allowed. In the fallback case, the security of the component update relies
-// only on the integrity of the CRX payloads, which is self-validating.
-// This is allowed only for some of the pre-Windows Vista versions not including
-// Windows XP SP3. As a side note, pings could be sent to the alternate URL too.
-bool CanUseAltUrlSource() {
-#if defined(OS_WIN)
-  return !base::win::MaybeHasSHA256Support();
-#else
-  return false;
-#endif  // OS_WIN
-}
-
 // If there is an element of |vec| of the form |test|=.*, returns the right-
 // hand side of that assignment. Otherwise, returns an empty string.
 // The right-hand side may contain additional '=' characters, allowing for
 // further nesting of switch arguments.
 std::string GetSwitchArgument(const std::vector<std::string>& vec,
                               const char* test) {
   if (vec.empty())
     return std::string();
   for (std::vector<std::string>::const_iterator it = vec.begin();
        it != vec.end(); ++it) {
     const std::size_t found = it->find("=");
     if (found != std::string::npos) {
       if (it->substr(0, found) == test) {
         return it->substr(found + 1);
       }
     }
   }
   return std::string();
 }
 
 }  // namespace
 
 ConfiguratorImpl::ConfiguratorImpl(
     const base::CommandLine* cmdline,
     net::URLRequestContextGetter* url_request_getter)
     : url_request_getter_(url_request_getter),
       fast_update_(false),
       pings_enabled_(false),
       deltas_enabled_(false),
-      background_downloads_enabled_(false),
-      fallback_to_alt_source_url_enabled_(false) {
+      background_downloads_enabled_(false) {
   // Parse comma-delimited debug flags.
   std::vector<std::string> switch_values = base::SplitString(
       cmdline->GetSwitchValueASCII(switches::kComponentUpdater), ",",
       base::KEEP_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
   fast_update_ = HasSwitchValue(switch_values, kSwitchFastUpdate);
   pings_enabled_ = !HasSwitchValue(switch_values, kSwitchDisablePings);
   deltas_enabled_ = !HasSwitchValue(switch_values, kSwitchDisableDeltaUpdates);
 
 #if defined(OS_WIN)
   background_downloads_enabled_ =
       !HasSwitchValue(switch_values, kSwitchDisableBackgroundDownloads);
 #else
   background_downloads_enabled_ = false;
 #endif
 
   const std::string switch_url_source =
       GetSwitchArgument(switch_values, kSwitchUrlSource);
   if (!switch_url_source.empty()) {
     url_source_override_ = GURL(switch_url_source);
     DCHECK(url_source_override_.is_valid());
   }
 
   if (HasSwitchValue(switch_values, kSwitchRequestParam))
     extra_info_ += "testrequest=\"1\"";
-
-  fallback_to_alt_source_url_enabled_ = CanUseAltUrlSource();
 }
 
 ConfiguratorImpl::~ConfiguratorImpl() {}
 
 int ConfiguratorImpl::InitialDelay() const {
   return fast_update_ ? 10 : (6 * kDelayOneMinute);
 }
 
 int ConfiguratorImpl::NextCheckDelay() const {
   return fast_update_ ? 60 : (6 * kDelayOneHour);
@@ skipping 10 matching lines @@
 int ConfiguratorImpl::UpdateDelay() const {
   return fast_update_ ? 10 : (15 * kDelayOneMinute);
 }
 
 std::vector<GURL> ConfiguratorImpl::UpdateUrl() const {
   std::vector<GURL> urls;
   if (url_source_override_.is_valid()) {
     urls.push_back(GURL(url_source_override_));
   } else {
     urls.push_back(GURL(kUpdaterDefaultUrl));
-    if (fallback_to_alt_source_url_enabled_) {
-      urls.push_back(GURL(kUpdaterAltUrl));
-    }
   }
   return urls;
 }
 
 std::vector<GURL> ConfiguratorImpl::PingUrl() const {
   return pings_enabled_ ? UpdateUrl() : std::vector<GURL>();
 }
 
 base::Version ConfiguratorImpl::GetBrowserVersion() const {
   return base::Version(version_info::GetVersionNumber());
@@ skipping 12 matching lines @@
 }
 
 bool ConfiguratorImpl::DeltasEnabled() const {
   return deltas_enabled_;
 }
 
 bool ConfiguratorImpl::UseBackgroundDownloader() const {
   return background_downloads_enabled_;
 }
 
-void ConfiguratorImpl::set_enable_alt_source_url(bool enable_alt_source_url) {
-  fallback_to_alt_source_url_enabled_ = enable_alt_source_url;
-}
-
 }  // namespace component_updater