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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_OS_CRYPT_ASYNC_BROWSER_DPAPI_KEY_PROVIDER_H_
#define COMPONENTS_OS_CRYPT_ASYNC_BROWSER_DPAPI_KEY_PROVIDER_H_
#include <optional>
#include <string>
#include <vector>
#include "base/containers/span.h"
#include "base/gtest_prod_util.h"
#include "base/memory/raw_ptr.h"
#include "base/types/expected.h"
#include "components/os_crypt/async/browser/key_provider.h"
class PrefService;
namespace os_crypt_async {
class DPAPIKeyProviderTest;
// The DPAPI Key Provider provides forwards and backwards compatibility with
// OSCrypt's in-built DPAPI support on Windows. The Key provider will use the
// key from OSCrypt's storage which is encrypted with DPAPI. OSCrypt::Init
// should always be called before attempting to obtain a key from this provider.
class DPAPIKeyProvider : public KeyProvider {
public:
explicit DPAPIKeyProvider(PrefService* local_state);
~DPAPIKeyProvider() override;
private:
friend class DPAPIKeyProviderTestBase;
FRIEND_TEST_ALL_PREFIXES(DPAPIKeyProviderTest, DPAPIFailing);
FRIEND_TEST_ALL_PREFIXES(DPAPIKeyProviderTest, OSCryptNotInit);
FRIEND_TEST_ALL_PREFIXES(DPAPIKeyProviderTest, OSCryptBadKeyHeader);
FRIEND_TEST_ALL_PREFIXES(DPAPIKeyProviderTestBase, NoOSCrypt);
// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
enum class KeyStatus {
kSuccess = 0,
kKeyNotFound = 1,
kKeyDecodeFailure = 2,
kKeyTooShort = 3,
kInvalidKeyHeader = 4,
kDPAPIDecryptFailure = 5,
kInvalidKeyLength = 6,
kMaxValue = kInvalidKeyLength,
};
// os_crypt_async::KeyProvider interface.
void GetKey(KeyCallback callback) override;
bool UseForEncryption() override;
bool IsCompatibleWithOsCryptSync() override;
// Attempt to retrieve `encrypted_key` from `pref_path`. If a key is found
// that matches and has correct `key_prefix` then the raw encrypted key is
// returned without the `key_prefix`.
std::optional<std::vector<uint8_t>> RetrieveEncryptedKey(
const std::string& pref_path,
base::span<const uint8_t> key_prefix);
base::expected<Encryptor::Key, KeyStatus> GetKeyInternal();
raw_ptr<PrefService> local_state_;
};
} // namespace os_crypt_async
#endif // COMPONENTS_OS_CRYPT_ASYNC_BROWSER_DPAPI_KEY_PROVIDER_H_
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