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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.
// Various utility methods for nigori-based multi-type encryption.
#ifndef SYNC_ENGINE_NIGORI_UTIL_H_
#define SYNC_ENGINE_NIGORI_UTIL_H_
#pragma once
#include "base/compiler_specific.h"
#include "sync/internal_api/public/syncable/model_type.h"
#include "sync/protocol/nigori_specifics.pb.h"
namespace browser_sync {
class Cryptographer;
}
namespace sync_pb {
class EntitySpecifics;
}
namespace syncable {
const char kEncryptedString[] = "encrypted";
class BaseTransaction;
class Entry;
class MutableEntry;
class WriteTransaction;
// Check if our unsyced changes are encrypted if they need to be based on
// |encrypted_types|.
// Returns: true if all unsynced data that should be encrypted is.
// false if some unsynced changes need to be encrypted.
// This method is similar to ProcessUnsyncedChangesForEncryption but does not
// modify the data and does not care if data is unnecessarily encrypted.
bool VerifyUnsyncedChangesAreEncrypted(
BaseTransaction* const trans,
ModelTypeSet encrypted_types);
// Processes all unsynced changes and ensures they are appropriately encrypted
// or unencrypted, based on |encrypted_types|.
bool ProcessUnsyncedChangesForEncryption(
WriteTransaction* const trans,
browser_sync::Cryptographer* cryptographer);
// Returns true if the entry requires encryption but is not encrypted, false
// otherwise. Note: this does not check that already encrypted entries are
// encrypted with the proper key.
bool EntryNeedsEncryption(ModelTypeSet encrypted_types,
const Entry& entry);
// Same as EntryNeedsEncryption, but looks at specifics.
bool SpecificsNeedsEncryption(ModelTypeSet encrypted_types,
const sync_pb::EntitySpecifics& specifics);
// Verifies all data of type |type| is encrypted appropriately.
bool VerifyDataTypeEncryptionForTest(
BaseTransaction* const trans,
browser_sync::Cryptographer* cryptographer,
ModelType type,
bool is_encrypted) WARN_UNUSED_RESULT;
// Stores |new_specifics| into |entry|, encrypting if necessary.
// Returns false if an error encrypting occurred (does not modify |entry|).
// Note: gracefully handles new_specifics aliasing with entry->Get(SPECIFICS).
bool UpdateEntryWithEncryption(
browser_sync::Cryptographer* cryptographer,
const sync_pb::EntitySpecifics& new_specifics,
MutableEntry* entry);
} // namespace syncable
#endif // SYNC_ENGINE_NIGORI_UTIL_H_
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