Add a lock to the managed user settings page and require authentication for unlocking.

chrome/browser/managed_mode/managed_user_passphrase.h

Index: chrome/browser/managed_mode/managed_user_passphrase.h
diff --git a/chrome/browser/managed_mode/managed_user_passphrase.h b/chrome/browser/managed_mode/managed_user_passphrase.h
new file mode 100644
index 0000000000000000000000000000000000000000..f27e21a1fa165c04369efabc53a193e770602bc3
--- /dev/null
+++ b/chrome/browser/managed_mode/managed_user_passphrase.h
@@ -0,0 +1,37 @@
+// Copyright (c) 2012 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.
+
+#ifndef CHROME_BROWSER_MANAGED_MODE_MANAGED_USER_PASSPHRASE_H_
+#define CHROME_BROWSER_MANAGED_MODE_MANAGED_USER_PASSPHRASE_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+
+// This class can be used to derive a hash of a provided passphrase. When an
+// empty salt is given as parameter to the constructor, a new salt is
+// generated randomly, which can be accessed through the |GetSalt| method.
+class ManagedUserPassphrase {
+ public:
+  explicit ManagedUserPassphrase(const std::string& salt);
+  ~ManagedUserPassphrase();
+
+  std::string GetSalt();

[Bernhard Bauer, 2013/01/08 17:43:14]

Newlines before comments would be nice.

[Adrian Kuegel, 2013/01/09 12:10:05]

Done.

+  // This function generates a hash from a passphrase, which should be provided
+  // as the first parameter. On return, the second parameter will contain the
+  // Base64-encoded hash of the password.
+  void GenerateHashFromPassphrase(const std::string& passphrase,
+      std::string* encoded_passphrase_hash);

[Bernhard Bauer, 2013/01/08 17:43:14]

Align the parameter please.

[Adrian Kuegel, 2013/01/09 12:10:05]

Done.

+
+ private:
+  void GetPassphraseHash(const std::string& passphrase,
+      std::string* passphrase_hash);

[Bernhard Bauer, 2013/01/08 17:43:14]

Align please.

[Adrian Kuegel, 2013/01/09 12:10:05]

Done.

+  void GenerateRandomSalt();
+
+  std::string salt_;
+
+  DISALLOW_COPY_AND_ASSIGN(ManagedUserPassphrase);
+};
+
+#endif  // CHROME_BROWSER_MANAGED_MODE_MANAGED_USER_PASSPHRASE_H_