Implement cryptographicallyRandomValues to let WebKit have some

cryptographically strong random values inside the sandbox.

Review URL: http://codereview.chromium.org/6581007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@75815 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 14 insertions, 2 deletions

diff --git a/webkit/glue/webkitclient_impl.cc b/webkit/glue/webkitclient_impl.cc
index 701d5c3..3a47de4 100644
--- a/webkit/glue/webkitclient_impl.cc
+++ b/webkit/glue/webkitclient_impl.cc
@@ -14,10 +14,11 @@
 
 #include "base/debug/trace_event.h"
 #include "base/message_loop.h"
-#include "base/metrics/stats_counters.h"
 #include "base/metrics/histogram.h"
-#include "base/process_util.h"
+#include "base/metrics/stats_counters.h"
 #include "base/platform_file.h"
+#include "base/process_util.h"
+#include "base/rand_util.h"
 #include "base/singleton.h"
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
@@ -445,6 +446,17 @@ double WebKitClientImpl::currentTime() {
   return base::Time::Now().ToDoubleT();
 }
 
+void WebKitClientImpl::cryptographicallyRandomValues(
+    unsigned char* buffer, size_t length) {
+  uint64 bytes = 0;
+  for (size_t i = 0; i < length; ++i) {
+    size_t offset = i % sizeof(bytes);
+    if (!offset)
+      bytes = base::RandUint64();
+    buffer[i] = reinterpret_cast<unsigned char*>(&bytes)[offset];
+  }
+}
+
 void WebKitClientImpl::setSharedTimerFiredFunction(void (*func)()) {
   shared_timer_func_ = func;
 }