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diff --git a/chromeos/login/auth/extended_authenticator_impl.h b/chromeos/login/auth/extended_authenticator_impl.h
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+++ b/chromeos/login/auth/extended_authenticator_impl.h
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+// Copyright 2014 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 CHROMEOS_LOGIN_AUTH_EXTENDED_AUTHENTICATOR_IMPL_H_
+#define CHROMEOS_LOGIN_AUTH_EXTENDED_AUTHENTICATOR_IMPL_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/callback.h"
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "chromeos/chromeos_export.h"
+#include "chromeos/login/auth/extended_authenticator.h"
+#include "third_party/cros_system_api/dbus/service_constants.h"
+
+namespace chromeos {
+
+class AuthStatusConsumer;
+class UserContext;
+
+// Implements ExtendedAuthenticator.
+class CHROMEOS_EXPORT ExtendedAuthenticatorImpl : public ExtendedAuthenticator {
+ public:
+  explicit ExtendedAuthenticatorImpl(NewAuthStatusConsumer* consumer);
+  explicit ExtendedAuthenticatorImpl(AuthStatusConsumer* consumer);
+
+  // ExtendedAuthenticator:
+  virtual void SetConsumer(AuthStatusConsumer* consumer) override;
+  virtual void AuthenticateToMount(
+      const UserContext& context,
+      const ResultCallback& success_callback) override;
+  virtual void AuthenticateToCheck(
+      const UserContext& context,
+      const base::Closure& success_callback) override;
+  virtual void CreateMount(const std::string& user_id,
+                           const std::vector<cryptohome::KeyDefinition>& keys,
+                           const ResultCallback& success_callback) override;
+  virtual void AddKey(const UserContext& context,
+                      const cryptohome::KeyDefinition& key,
+                      bool replace_existing,
+                      const base::Closure& success_callback) override;
+  virtual void UpdateKeyAuthorized(
+      const UserContext& context,
+      const cryptohome::KeyDefinition& key,
+      const std::string& signature,
+      const base::Closure& success_callback) override;
+  virtual void RemoveKey(const UserContext& context,
+                         const std::string& key_to_remove,
+                         const base::Closure& success_callback) override;
+  virtual void TransformKeyIfNeeded(const UserContext& user_context,
+                                    const ContextCallback& callback) override;
+
+ private:
+  virtual ~ExtendedAuthenticatorImpl();
+
+  // Callback for system salt getter.
+  void OnSaltObtained(const std::string& system_salt);
+
+  // Performs actual operation with fully configured |context|.
+  void DoAuthenticateToMount(const ResultCallback& success_callback,
+                             const UserContext& context);
+  void DoAuthenticateToCheck(const base::Closure& success_callback,
+                             const UserContext& context);
+  void DoAddKey(const cryptohome::KeyDefinition& key,
+                bool replace_existing,
+                const base::Closure& success_callback,
+                const UserContext& context);
+  void DoUpdateKeyAuthorized(const cryptohome::KeyDefinition& key,
+                             const std::string& signature,
+                             const base::Closure& success_callback,
+                             const UserContext& context);
+  void DoRemoveKey(const std::string& key_to_remove,
+                   const base::Closure& success_callback,
+                   const UserContext& context);
+
+  // Inner operation callbacks.
+  void OnMountComplete(const std::string& time_marker,
+                       const UserContext& context,
+                       const ResultCallback& success_callback,
+                       bool success,
+                       cryptohome::MountError return_code,
+                       const std::string& mount_hash);
+  void OnOperationComplete(const std::string& time_marker,
+                           const UserContext& context,
+                           const base::Closure& success_callback,
+                           bool success,
+                           cryptohome::MountError return_code);
+
+  bool salt_obtained_;
+  std::string system_salt_;
+  std::vector<base::Closure> system_salt_callbacks_;
+
+  NewAuthStatusConsumer* consumer_;
+  AuthStatusConsumer* old_consumer_;
+
+  DISALLOW_COPY_AND_ASSIGN(ExtendedAuthenticatorImpl);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROMEOS_LOGIN_AUTH_EXTENDED_AUTHENTICATOR_IMPL_H_