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// 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 CHROMEOS_CRYPTOHOME_CRYPTOHOME_LIBRARY_H_
#define CHROMEOS_CRYPTOHOME_CRYPTOHOME_LIBRARY_H_
#include <string>
#include "base/basictypes.h"
#include "chromeos/chromeos_export.h"
namespace chromeos {
// This interface defines the interaction with the ChromeOS cryptohome library
// APIs.
class CHROMEOS_EXPORT CryptohomeLibrary {
public:
// Manage an explicitly initialized global instance.
static void Initialize();
static bool IsInitialized();
static void Shutdown();
static CryptohomeLibrary* Get();
// Sets up Get() to return |impl| for testing (e.g. with a mock
// implementation). Call SetForTest(NULL) when |impl| is deleted.
static void SetForTest(CryptohomeLibrary* impl);
// Returns a CryptohomeLibrary instance for testing. Does not set or affect
// the global instance.
static CryptohomeLibrary* GetTestImpl();
// Public so that result of GetTestImpl can be destroyed.
virtual ~CryptohomeLibrary();
// Wrappers of the functions for working with Tpm.
// Returns whether Tpm is presented and enabled.
virtual bool TpmIsEnabled() = 0;
// Returns whether device has already been owned.
virtual bool TpmIsOwned() = 0;
// Returns whether device is being owned (Tpm password is generating).
virtual bool TpmIsBeingOwned() = 0;
// Attempts to start owning (if device isn't owned and isn't being owned).
virtual void TpmCanAttemptOwnership() = 0;
// Clears Tpm password. Password should be cleared after it was generated and
// shown to user.
virtual void TpmClearStoredPassword() = 0;
virtual bool InstallAttributesGet(const std::string& name,
std::string* value) = 0;
virtual bool InstallAttributesSet(const std::string& name,
const std::string& value) = 0;
virtual bool InstallAttributesFinalize() = 0;
virtual bool InstallAttributesIsInvalid() = 0;
virtual bool InstallAttributesIsFirstInstall() = 0;
// Returns system hash in hex encoded ascii format.
virtual std::string GetSystemSalt() = 0;
// Encrypts |token| with the system salt key (stable for the lifetime
// of the device). Useful to avoid storing plain text in place like
// Local State.
virtual std::string EncryptWithSystemSalt(const std::string& token) = 0;
// Decrypts |token| with the system salt key (stable for the lifetime
// of the device).
virtual std::string DecryptWithSystemSalt(
const std::string& encrypted_token_hex) = 0;
protected:
CryptohomeLibrary();
private:
DISALLOW_COPY_AND_ASSIGN(CryptohomeLibrary);
};
} // namespace chromeos
#endif // CHROMEOS_CRYPTOHOME_CRYPTOHOME_LIBRARY_H_
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