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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef KEYSTORE_USER_STATE_H_
#define KEYSTORE_USER_STATE_H_
#include <sys/types.h>
#include <openssl/aes.h>
#include <utils/String8.h>
#include <keystore/keystore.h>
#include <vector>
class UserState {
public:
explicit UserState(uid_t userId);
~UserState();
bool initialize();
uid_t getUserId() const { return mUserId; }
const char* getUserDirName() const { return mUserDir; }
const char* getMasterKeyFileName() const { return mMasterKeyFile; }
void setState(State state);
State getState() const { return mState; }
int8_t getRetry() const { return mRetry; }
void zeroizeMasterKeysInMemory();
bool deleteMasterKey();
ResponseCode initialize(const android::String8& pw);
ResponseCode copyMasterKey(UserState* src);
ResponseCode copyMasterKeyFile(UserState* src);
ResponseCode writeMasterKey(const android::String8& pw);
ResponseCode readMasterKey(const android::String8& pw);
const std::vector<uint8_t>& getEncryptionKey() const { return mMasterKey; }
bool reset();
private:
static const int SHA1_DIGEST_SIZE_BYTES = 16;
static const int SHA256_DIGEST_SIZE_BYTES = 32;
static const int MASTER_KEY_SIZE_BYTES = SHA256_DIGEST_SIZE_BYTES;
static const int MASTER_KEY_SIZE_BITS = MASTER_KEY_SIZE_BYTES * 8;
static const int MAX_RETRY = 4;
static const size_t SALT_SIZE = 16;
void generateKeyFromPassword(std::vector<uint8_t>& key, const android::String8& pw,
uint8_t* salt);
bool generateSalt();
bool generateMasterKey();
void setupMasterKeys();
uid_t mUserId;
char* mUserDir;
char* mMasterKeyFile;
State mState;
int8_t mRetry;
std::vector<uint8_t> mMasterKey;
uint8_t mSalt[SALT_SIZE];
};
#endif // KEYSTORE_USER_STATE_H_
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