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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 COMPONENTS_OS_CRYPT_OS_CRYPT_H_
#define COMPONENTS_OS_CRYPT_OS_CRYPT_H_
#include <string>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/single_thread_task_runner.h"
#include "base/strings/string16.h"
#include "build/build_config.h"
#if defined(OS_LINUX) && !defined(OS_CHROMEOS)
#include "components/os_crypt/key_storage_linux.h"
#endif // defined(OS_LINUX) && !defined(OS_CHROMEOS)
// The OSCrypt class gives access to simple encryption and decryption of
// strings. Note that on Mac, access to the system Keychain is required and
// these calls can block the current thread to collect user input. The same is
// true for Linux, if a password management tool is available.
class OSCrypt {
public:
#if defined(OS_LINUX) && !defined(OS_CHROMEOS)
// If |store_type| is a known password store, we will attempt to use it.
// In any other case, we default to auto-detecting the store.
// This should not be changed after OSCrypt has been used.
static void SetStore(const std::string& store_type);
// Some password stores may prompt the user for permission and show the
// application name.
static void SetProductName(const std::string& product_name);
// The gnome-keyring implementation requires calls from the main thread.
// TODO(crbug/466975): Libsecret and KWallet don't need this. We can remove
// this when we stop supporting keyring.
static void SetMainThreadRunner(
scoped_refptr<base::SingleThreadTaskRunner> main_thread_runner);
#endif // defined(OS_LINUX) && !defined(OS_CHROMEOS)
// Encrypt a string16. The output (second argument) is really an array of
// bytes, but we're passing it back as a std::string.
static bool EncryptString16(const base::string16& plaintext,
std::string* ciphertext);
// Decrypt an array of bytes obtained with EncryptString16 back into a
// string16. Note that the input (first argument) is a std::string, so you
// need to first get your (binary) data into a string.
static bool DecryptString16(const std::string& ciphertext,
base::string16* plaintext);
// Encrypt a string.
static bool EncryptString(const std::string& plaintext,
std::string* ciphertext);
// Decrypt an array of bytes obtained with EnctryptString back into a string.
// Note that the input (first argument) is a std::string, so you need to first
// get your (binary) data into a string.
static bool DecryptString(const std::string& ciphertext,
std::string* plaintext);
#if defined(OS_MACOSX)
// For unit testing purposes we instruct the Encryptor to use a mock Keychain
// on the Mac. The default is to use the real Keychain.
static void UseMockKeychain(bool use_mock);
#endif
private:
DISALLOW_IMPLICIT_CONSTRUCTORS(OSCrypt);
};
#if defined(OS_LINUX) && !defined(OS_CHROMEOS) && defined(UNIT_TEST)
// For unit testing purposes, inject methods to be used.
// |get_key_storage_mock| provides the desired |KeyStorage| implementation.
// If the provider returns |nullptr|, a hardcoded password will be used.
// |get_password_v11_mock| provides a password to derive the encryption key from
// If one parameter is |nullptr|, the function will be not be replaced.
// If all parameters are |nullptr|, the real implementation is restored.
void UseMockKeyStorageForTesting(KeyStorageLinux* (*get_key_storage_mock)(),
std::string* (*get_password_v11_mock)());
#endif // defined(OS_LINUX) && !defined(OS_CHROMEOS) && defined(UNIT_TEST)
#endif // COMPONENTS_OS_CRYPT_OS_CRYPT_H_
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