1 files changed, 39 insertions, 0 deletions
diff --git a/security/sandbox/chromium/base/unguessable_token.cc b/security/sandbox/chromium/base/unguessable_token.cc
new file mode 100644
index 0000000000..973b4167bd
--- /dev/null
+++ b/security/sandbox/chromium/base/unguessable_token.cc
@@ -0,0 +1,39 @@
+// Copyright 2016 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 "base/unguessable_token.h"
+
+#include "base/format_macros.h"
+#include "base/no_destructor.h"
+#include "base/rand_util.h"
+#include "base/strings/stringprintf.h"
+
+namespace base {
+
+UnguessableToken::UnguessableToken(const base::Token& token) : token_(token) {}
+
+// static
+UnguessableToken UnguessableToken::Create() {
+  return UnguessableToken(Token::CreateRandom());
+}
+
+// static
+const UnguessableToken& UnguessableToken::Null() {
+  static const NoDestructor<UnguessableToken> null_token;
+  return *null_token;
+}
+
+// static
+UnguessableToken UnguessableToken::Deserialize(uint64_t high, uint64_t low) {
+  // Receiving a zeroed out UnguessableToken from another process means that it
+  // was never initialized via Create(). Treat this case as a security issue.
+  DCHECK(!(high == 0 && low == 0));
+  return UnguessableToken(Token{high, low});
+}
+
+std::ostream& operator<<(std::ostream& out, const UnguessableToken& token) {
+  return out << "(" << token.ToString() << ")";
+}
+
+}  // namespace base