Remove Windows XP SHA-256 and ECDSA logic.

content/browser/browser_main_runner.cc

Index: content/browser/browser_main_runner.cc
diff --git a/content/browser/browser_main_runner.cc b/content/browser/browser_main_runner.cc
index 2585c8dd870f2d0e8b3c2805bb7b0f9b5611ba67..9ee9ee17a1b3bddffdaa8c3f95efbd3df769fe02 100644
--- a/content/browser/browser_main_runner.cc
+++ b/content/browser/browser_main_runner.cc
@@ -34,12 +34,8 @@
 #endif
 
 #if defined(OS_WIN)
-#include "base/win/win_util.h"
 #include "base/win/windows_version.h"
-#include "net/cert/sha256_legacy_support_win.h"
-#include "sandbox/win/src/sidestep/preamble_patcher.h"
 #include "ui/base/win/scoped_ole_initializer.h"
-#include "ui/gfx/switches.h"
 #include "ui/gfx/win/direct_write.h"
 #endif
 
@@ -49,86 +45,6 @@ namespace {
 
 bool g_exited_main_message_loop = false;
 
-#if defined(OS_WIN)
-#if !defined(_WIN64)
-// Pointer to the original CryptVerifyCertificateSignatureEx function.
-net::sha256_interception::CryptVerifyCertificateSignatureExFunc
-    g_real_crypt_verify_signature_stub = NULL;
-
-// Stub function that is called whenever the Crypt32 function
-// CryptVerifyCertificateSignatureEx is called. It just defers to net to perform
-// the actual verification.
-BOOL WINAPI CryptVerifyCertificateSignatureExStub(
-    HCRYPTPROV_LEGACY provider,
-    DWORD encoding_type,
-    DWORD subject_type,
-    void* subject_data,
-    DWORD issuer_type,
-    void* issuer_data,
-    DWORD flags,
-    void* extra) {
-  return net::sha256_interception::CryptVerifyCertificateSignatureExHook(
-      g_real_crypt_verify_signature_stub, provider, encoding_type, subject_type,
-      subject_data, issuer_type, issuer_data, flags, extra);
-}
-#endif  // !defined(_WIN64)
-
-// If necessary, install an interception
-void InstallSha256LegacyHooks() {
-#if defined(_WIN64)
-  // Interception on x64 is not supported.
-  return;
-#else
-  if (base::win::MaybeHasSHA256Support())
-    return;
-
-  net::sha256_interception::CryptVerifyCertificateSignatureExFunc
-      cert_verify_signature_ptr = reinterpret_cast<
-          net::sha256_interception::CryptVerifyCertificateSignatureExFunc>(
-              ::GetProcAddress(::GetModuleHandle(L"crypt32.dll"),
-                               "CryptVerifyCertificateSignatureEx"));
-  CHECK(cert_verify_signature_ptr);
-
-  DWORD old_protect = 0;
-  if (!::VirtualProtect(cert_verify_signature_ptr, 5, PAGE_EXECUTE_READWRITE,
-                        &old_protect)) {
-    return;
-  }
-
-  g_real_crypt_verify_signature_stub =
-      reinterpret_cast<
-          net::sha256_interception::CryptVerifyCertificateSignatureExFunc>(
-              VirtualAllocEx(::GetCurrentProcess(), NULL,
-                             sidestep::kMaxPreambleStubSize, MEM_COMMIT,
-                             PAGE_EXECUTE_READWRITE));
-  if (g_real_crypt_verify_signature_stub == NULL) {
-    CHECK(::VirtualProtect(cert_verify_signature_ptr, 5, old_protect,
-                           &old_protect));
-    return;
-  }
-
-  sidestep::SideStepError patch_result =
-      sidestep::PreamblePatcher::Patch(
-          cert_verify_signature_ptr, CryptVerifyCertificateSignatureExStub,
-          g_real_crypt_verify_signature_stub, sidestep::kMaxPreambleStubSize);
-  if (patch_result != sidestep::SIDESTEP_SUCCESS) {
-    CHECK(::VirtualFreeEx(::GetCurrentProcess(),
-                          g_real_crypt_verify_signature_stub, 0,
-                          MEM_RELEASE));
-    CHECK(::VirtualProtect(cert_verify_signature_ptr, 5, old_protect,
-                           &old_protect));
-    return;
-  }
-
-  DWORD dummy = 0;
-  CHECK(::VirtualProtect(cert_verify_signature_ptr, 5, old_protect, &dummy));
-  CHECK(::VirtualProtect(g_real_crypt_verify_signature_stub,
-                         sidestep::kMaxPreambleStubSize, old_protect,
-                         &old_protect));
-#endif  // _WIN64
-}
-#endif  // OS_WIN
-
 }  // namespace
 
 class BrowserMainRunnerImpl : public BrowserMainRunner {
@@ -180,7 +96,6 @@ class BrowserMainRunnerImpl : public BrowserMainRunner {
         // Win32 API here directly.
         ImmDisableTextFrameService(static_cast<DWORD>(-1));
       }
-      InstallSha256LegacyHooks();
 #endif  // OS_WIN
 
       base::StatisticsRecorder::Initialize();