Add first implemenation for SU password sync

chrome/browser/chromeos/login/managed/supervised_user_authentication.h

Index: chrome/browser/chromeos/login/managed/supervised_user_authentication.h
diff --git a/chrome/browser/chromeos/login/managed/supervised_user_authentication.h b/chrome/browser/chromeos/login/managed/supervised_user_authentication.h
new file mode 100644
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+++ b/chrome/browser/chromeos/login/managed/supervised_user_authentication.h
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+// Copyright (c) 2013 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_CHROMEOS_LOGIN_MANAGED_SUPERVISED_USER_AUTHENTICATION_H_
+#define CHROME_BROWSER_CHROMEOS_LOGIN_MANAGED_SUPERVISED_USER_AUTHENTICATION_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/memory/weak_ptr.h"
+#include "base/strings/string16.h"
+#include "base/values.h"
+#include "chrome/browser/chromeos/login/managed/supervised_user_login_flow.h"
+
+namespace chromeos {
+
+class SupervisedUserManager;
+
+// This is a class that encapsulates all details of password handling for
+// supervised users.
+// Main property is the schema used to handle password. For now it can be either
+// plain password schema, when plain text password is passed to standard
+// cryprohome authentication algorithm without modification, or hashed password
+// schema, when password is additionally hashed with user-specific salt.
+// Second schema is required to allow password syncing across devices for
+// supervised users.
+class SupervisedUserAuthentication {
+ public:
+  enum Schema {
+    SCHEMA_PLAIN = 1,
+    SCHEMA_SALT_HASHED = 2
+  };
+
+  explicit SupervisedUserAuthentication(SupervisedUserManager* owner);
+  virtual ~SupervisedUserAuthentication();
+
+  // Transforms password according to schema specified in Local State.
+  std::string TransformPassword(const std::string& supervised_user_id,
+                                const std::string& password);
+
+  // Returns |true| if current password schema for user is different from
+  // target schema.
+  bool PasswordNeedsMigration(const std::string& user_id);
+
+  // Schedules password migration for |user_id| with |password| as a plain text
+  // password. Migration should happen during |user_login_flow|.
+  void SchedulePasswordMigration(const std::string& user_id,
+                                 const std::string& password,
+                                 SupervisedUserLoginFlow* user_login_flow);
+
+  // Fills |password_data| with |password|-specific data for |user_id|,
+  // depending on target schema. Does not affect Local State.
+  bool FillDataForNewUser(const std::string& user_id,
+                          const std::string& password,
+                          base::DictionaryValue* password_data);
+
+  // Stores |password_data| for |user_id| in Local State. Only public parts
+  // of |password_data| will be stored.
+  void StorePasswordData(const std::string& user_id,
+                         const base::DictionaryValue& password_data);
+
+ private:
+  SupervisedUserManager* owner_;
+
+  // Controls if migration is enabled.
+  bool migration_enabled_;
+
+  // Target schema version. Affects migration process and new user creation.
+  Schema stable_schema_;
+
+  // Utility method that gets schema version for |user_id| from Local State.
+  Schema GetPasswordSchema(const std::string& user_id);
+
+  DISALLOW_COPY_AND_ASSIGN(SupervisedUserAuthentication);
+};
+
+} // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_LOGIN_MANAGED_SUPERVISED_USER_AUTHENTICATION_H_