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-rw-r--r--toolkit/components/resistfingerprinting/RelativeTimeline.cpp39
1 files changed, 39 insertions, 0 deletions
diff --git a/toolkit/components/resistfingerprinting/RelativeTimeline.cpp b/toolkit/components/resistfingerprinting/RelativeTimeline.cpp
new file mode 100644
index 0000000000..eca7fca975
--- /dev/null
+++ b/toolkit/components/resistfingerprinting/RelativeTimeline.cpp
@@ -0,0 +1,39 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsCOMPtr.h"
+#include "nsIRandomGenerator.h"
+#include "nsServiceManagerUtils.h"
+
+#include "RelativeTimeline.h"
+
+namespace mozilla {
+
+int64_t RelativeTimeline::GetRandomTimelineSeed() {
+ if (mRandomTimelineSeed == 0) {
+ nsresult rv;
+ nsCOMPtr<nsIRandomGenerator> randomGenerator =
+ do_GetService("@mozilla.org/security/random-generator;1", &rv);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ mRandomTimelineSeed = rand();
+ return mRandomTimelineSeed;
+ }
+
+ uint8_t* buffer = nullptr;
+ rv = randomGenerator->GenerateRandomBytes(sizeof(mRandomTimelineSeed),
+ &buffer);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ mRandomTimelineSeed = rand();
+ return mRandomTimelineSeed;
+ }
+
+ memcpy(&mRandomTimelineSeed, buffer, sizeof(mRandomTimelineSeed));
+ MOZ_ASSERT(buffer);
+ free(buffer);
+ }
+ return mRandomTimelineSeed;
+}
+
+} // namespace mozilla