我有以下SqlCipher数据库。它在我第一次安装应用程序时工作正常，但如果我关闭，从最近的历史记录中移除应用程序（在堆栈外）并重新打开应用程序，它崩溃时出现以下错误。一旦遇到异常，db就不会打开，例如我在Activity中放置一个1/0来强制它崩溃，同样的情况发生在下面。
07-20 15:39:05.669: E/Database(21425): CREATE TABLE android_metadata failed
07-20 15:39:05.669: E/Database(21425): Failed to setLocale() when constructing, closing the database
07-20 15:39:05.669: E/Database(21425): net.sqlcipher.database.SQLiteException: file is encrypted or is not a database
我发现以下链接似乎可以解决问题（我不确定它是否是解决方案），但我不确定如何将其实现到我的代码中。任何人都可以帮忙或告诉我为什么我会收到此错误？
http://rootslash.net/88542/sqlcipher-cant-open-database-after-apprestart
这是我的数据库代码，我使用SqlCipher SQLiteOpenHelper来创建数据库。我想我需要修改这个代码，以便它返回一个DB对象（如果已经存在），如果它不存在则创建一个。我只是不确定如何。
提前致谢。
[EDIT1] 我有一个LoginActivity来验证用户的凭据。如果它们是有效的，它会加载MenuActivity，我在其中放置1/0来强制崩溃。崩溃后，如果我重新打开应用程序，它会在登录数据库用户表的行的LoginActivity中崩溃。
DBModel是一个具有SqliteOpenHelper和CRUD方法的类。
因此它在DBModel类中的checkUserInDB（）崩溃，后者又调用queryAllFromUser（）。
07-25 13:45:43.043 10654-10654/? E/AppObj﹕ Build.SERIAL = SH43PWM07311
07-25 13:45:43.203 10654-10654/? E/AppObj﹕ secretKey = com.android.org.bouncycastle.jcajce.provider.symmetric.util.BCPBEKey@31a79cea
07-25 13:45:43.643 10654-10654/? E/Database﹕ CREATE TABLE android_metadata failed
07-25 13:45:43.643 10654-10654/? E/Database﹕ Failed to setLocale() when constructing, closing the database
net.sqlcipher.database.SQLiteException: file is encrypted or is not a database
at net.sqlcipher.database.SQLiteDatabase.native_setLocale(Native Method)
at net.sqlcipher.database.SQLiteDatabase.setLocale(SQLiteDatabase.java:2096)
at net.sqlcipher.database.SQLiteDatabase.<init>(SQLiteDatabase.java:1962)
at net.sqlcipher.database.SQLiteDatabase.openDatabase(SQLiteDatabase.java:881)
at net.sqlcipher.database.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:913)
at net.sqlcipher.database.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:132)
at net.sqlcipher.database.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:197)
at net.sqlcipher.database.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:184)
at devreach.co.uk.devreach.DBModel.queryAllFromUser(DBModel.java:175)
at devreach.co.uk.devreach.DBModel.checkIfUserInDB(DBModel.java:262)
at devreach.co.uk.devreach.LoginActivity.onCreate(LoginActivity.java:62)
at android.app.Activity.performCreate(Activity.java:5958)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1129)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2474)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1359)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:155)
at android.app.ActivityThread.main(ActivityThread.java:5696)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1028)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:823)
07-25 13:45:43.643 10654-10654/? E/SQLiteOpenHelper﹕ Couldn't open devreach.db for writing (will try read-only):
net.sqlcipher.database.SQLiteException: file is encrypted or is not a database
at net.sqlcipher.database.SQLiteDatabase.native_setLocale(Native Method)
at net.sqlcipher.database.SQLiteDatabase.setLocale(SQLiteDatabase.java:2096)
at net.sqlcipher.database.SQLiteDatabase.<init>(SQLiteDatabase.java:1962)
at net.sqlcipher.database.SQLiteDatabase.openDatabase(SQLiteDatabase.java:881)
at net.sqlcipher.database.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:913)
at net.sqlcipher.database.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:132)
at net.sqlcipher.database.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:197)
at net.sqlcipher.database.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:184)
at devreach.co.uk.devreach.DBModel.queryAllFromUser(DBModel.java:175)
at devreach.co.uk.devreach.DBModel.checkIfUserInDB(DBModel.java:262)
at devreach.co.uk.devreach.LoginActivity.onCreate(LoginActivity.java:62)
at android.app.Activity.performCreate(Activity.java:5958)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1129)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2474)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1359)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:155)
at android.app.ActivityThread.main(ActivityThread.java:5696)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1028)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:823)
07-25 13:45:43.983 10654-10654/? E/Database﹕ CREATE TABLE android_metadata failed
07-25 13:45:43.983 10654-10654/? E/Database﹕ Failed to setLocale() when constructing, closing the database
net.sqlcipher.database.SQLiteException: file is encrypted or is not a database
at net.sqlcipher.database.SQLiteDatabase.native_setLocale(Native Method)
at net.sqlcipher.database.SQLiteDatabase.setLocale(SQLiteDatabase.java:2096)
at net.sqlcipher.database.SQLiteDatabase.<init>(SQLiteDatabase.java:1962)
at net.sqlcipher.database.SQLiteDatabase.openDatabase(SQLiteDatabase.java:881)
at net.sqlcipher.database.SQLiteDatabase.openDatabase(SQLiteDatabase.java:940)
at net.sqlcipher.database.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:219)
at net.sqlcipher.database.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:184)
at devreach.co.uk.devreach.DBModel.queryAllFromUser(DBModel.java:175)
at devreach.co.uk.devreach.DBModel.checkIfUserInDB(DBModel.java:262)
at devreach.co.uk.devreach.LoginActivity.onCreate(LoginActivity.java:62)
at android.app.Activity.performCreate(Activity.java:5958)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1129)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2474)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1359)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:155)
at android.app.ActivityThread.main(ActivityThread.java:5696)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1028)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:823)
07-25 13:45:43.983 10654-10654/? E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: devreach.co.uk.devreach, PID: 10654
java.lang.RuntimeException: Unable to start activity ComponentInfo{devreach.co.uk.devreach/devreach.co.uk.devreach.LoginActivity}: net.sqlcipher.database.SQLiteException: file is encrypted or is not a database
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2411)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2474)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1359)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:155)
at android.app.ActivityThread.main(ActivityThread.java:5696)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1028)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:823)
Caused by: net.sqlcipher.database.SQLiteException: file is encrypted or is not a database
at net.sqlcipher.database.SQLiteDatabase.native_setLocale(Native Method)
at net.sqlcipher.database.SQLiteDatabase.setLocale(SQLiteDatabase.java:2096)
at net.sqlcipher.database.SQLiteDatabase.<init>(SQLiteDatabase.java:1962)
at net.sqlcipher.database.SQLiteDatabase.openDatabase(SQLiteDatabase.java:881)
at net.sqlcipher.database.SQLiteDatabase.openDatabase(SQLiteDatabase.java:940)
at net.sqlcipher.database.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:219)
at net.sqlcipher.database.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:184)
at devreach.co.uk.devreach.DBModel.queryAllFromUser(DBModel.java:175)
at devreach.co.uk.devreach.DBModel.checkIfUserInDB(DBModel.java:262)
at devreach.co.uk.devreach.LoginActivity.onCreate(LoginActivity.java:62)
at android.app.Activity.performCreate(Activity.java:5958)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1129)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2474)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1359)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:155)
at android.app.ActivityThread.main(ActivityThread.java:5696)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1028)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:823)
LoginActivity：
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
appObj = (AppObj)getApplication();
editTextFirstName = (EditText)findViewById(R.id.edittextfirstname);
editTextPassword = (EditText)findViewById(R.id.editTextpassword);
String firstName = appObj.dbModel.checkIfUserInDB();
if(! firstName.equalsIgnoreCase("NO_USER")){
editTextFirstName.setText(firstName);
}
DbModel之后：
import net.sqlcipher.Cursor;
import net.sqlcipher.database.SQLiteDatabase;
import net.sqlcipher.database.SQLiteOpenHelper;
import android.content.ContentValues;
import android.content.Context;
import android.provider.BaseColumns;
import android.util.Log;
import android.widget.Toast;
public class DBModel {
private static final String TAG = DBModel.class.getSimpleName();
// table user column names
public static final String C_USER_ID_INDEX = BaseColumns._ID;
public static final String C_USER_ID = "userid";
public static final String C_USER_COMP_ID = "usercompid";
public static final String C_USER_FIRSTNAME = "userfirstname";
public static final String C_USER_LASTNAME = "userlastname";
public static final String C_USER_PASSWORD = "userpassword";
public static final String C_USER_DATE_TIME = "userdatetime";
// table company column names
public static final String C_COMPANY_ID_INDEX = BaseColumns._ID;
public static final String C_COMPANY_ID = "companyid";
public static final String C_COMPANY_NAME = "companyname";
public static final String C_COMPANY_URL = "companyurl";
public static final String C_COMPANY_GUID = "companyguid";
Context context;
DBHelper dbhelper;
AppObj appObj;
public DBModel(Context context) {
this.context = context;
dbhelper = new DBHelper();
appObj = (AppObj) context.getApplicationContext();
}
/**
* inner class to create/open/upgrade database
*
* @author matt
*
*/
private class DBHelper extends SQLiteOpenHelper {
// database name and version number
public static final String DB_NAME = "devreach.db";
public static final int DB_VERSION = 1;
// table names
public static final String TABLEUSER = "user";
public static final String TABLECOMPANY = "company";
public DBHelper() {
super(context, DB_NAME, null, DB_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
Log.e(TAG, "SQLiteOpenHelper oncreate ");
String sqlToCreateUserTable = String
.format("create table %s ( %s INTEGER primary key, %s TEXT, %s TEXT, %s TEXT, %s TEXT, %s TEXT, %s TEXT)",
TABLEUSER, C_USER_ID_INDEX, C_USER_ID, C_USER_COMP_ID,
C_USER_FIRSTNAME, C_USER_LASTNAME, C_USER_PASSWORD,
C_USER_DATE_TIME);
db.execSQL(sqlToCreateUserTable);
Log.e(TAG, "oncreate " + sqlToCreateUserTable);
String sqlToCreateCompanyTable = String
.format("create table %s ( %s INTEGER primary key, %s TEXT, %s TEXT, %s TEXT, %s TEXT)",
TABLECOMPANY, C_COMPANY_ID_INDEX, C_COMPANY_ID, C_COMPANY_NAME,
C_COMPANY_URL, C_COMPANY_GUID);
db.execSQL(sqlToCreateCompanyTable);
Log.e(TAG, "oncreate " + sqlToCreateCompanyTable);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}//end of onUpgrade
}//end of DBHelper
public void close() {
dbhelper.close();
}
public void deleteTableUser() {
// open database
SQLiteDatabase db = dbhelper.getWritableDatabase(AppObj.getSecretKey().toString());
// delete contents of table
db.delete(DBHelper.TABLEUSER, null, null);
}
public void insertIntoUser(ContentValues cv) {
SQLiteDatabase db = dbhelper.getWritableDatabase(AppObj.getSecretKey().toString());
db.insertWithOnConflict(DBHelper.TABLEUSER, null, cv, SQLiteDatabase.CONFLICT_REPLACE);
}
public Cursor queryAllFromUser() {
// open database
SQLiteDatabase db = dbhelper.getReadableDatabase(AppObj.getSecretKey().toString());
return db.query(DBHelper.TABLEUSER, null, null, null, null, null, null);
}
public void deleteTableCompany() {
// open database
SQLiteDatabase db = dbhelper.getWritableDatabase(AppObj.getSecretKey().toString());
// delete contents of table
db.delete(DBHelper.TABLECOMPANY, null, null);
}
public void insertIntoCompany(ContentValues cv) {
SQLiteDatabase db = dbhelper.getWritableDatabase(AppObj.getSecretKey().toString());
db.insertWithOnConflict(DBHelper.TABLECOMPANY, null, cv, SQLiteDatabase.CONFLICT_REPLACE);
}
public Cursor queryAllFromCompany() {
// open database
SQLiteDatabase db = dbhelper.getReadableDatabase(AppObj.getSecretKey().toString());
return db.query(DBHelper.TABLECOMPANY, null, null, null, null, null, null);
}
public String getCompanyGuid(){
String guid = null;
Cursor c = null;
SQLiteDatabase db = dbhelper.getReadableDatabase(AppObj.getSecretKey().toString());
c = db.query(DBHelper.TABLECOMPANY, null, null, null, null, null, null);
if(c != null){
if(c.moveToLast()){
guid = c.getString(c.getColumnIndex(DBModel.C_COMPANY_GUID));
}
}
try{
c.close();
}catch(Exception e){}
return guid;
}
public String getCompanyID(){
String id = null;
Cursor c = null;
SQLiteDatabase db = dbhelper.getReadableDatabase(AppObj.getSecretKey().toString());
c = db.query(DBHelper.TABLECOMPANY, null, null, null, null, null, null);
if(c != null){
if(c.moveToLast()){
id = c.getString(c.getColumnIndex(DBModel.C_COMPANY_ID));
}
}
try{
c.close();
}catch(Exception e){}
return id;
}
public String checkIfUserInDB() {
String firstName = null;
Cursor c = queryAllFromUser();
if(c != null && c.getCount() > 0){
if(c.moveToLast()){
Log.e(TAG,"c != null and > 0");
firstName = c.getString(c.getColumnIndex(DBModel.C_USER_FIRSTNAME));
}
}else{
Log.e(TAG,"c == null");
firstName = "NO_USER";
}
try{
c.close();
}catch(Exception e){}
Log.e(TAG,"firstName = " + firstName);
return firstName;
}
}//end of DBModel
[EDIT2]
@Override
public void onCreate() {
super.onCreate();
secretKey = null;
Log.e(TAG, "Build.SERIAL = " + Build.SERIAL);
SecureRandom secureRandom = new SecureRandom();
byte[] salt = secureRandom.generateSeed(256);
try {
secretKey = generateKey(Build.SERIAL.toCharArray(), salt);
Log.e(TAG, "key-Base64 before in appObj = "+new String(Base64.encode(RROnCallApplication.getSecretKey().getEncoded(),0)));
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvalidKeySpecException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.e(TAG, "secretKey = " + secretKey);
SQLiteDatabase.loadLibs(this);
dbModel = new DBModel(this);
webService = new WebService(this);
alertCount = 0;
// Cursor checkCarerTable = dbModel.queryAllFromCarer();
//
// if(checkCarerTable.getCount() == 0){
//
// //runGetCarersService();
// //runGetClientsService();
//
//
// }else{
//
// Log.e(TAG, "carer and client table is populated with some data");
// }
}
private static SecretKey generateKey(char[] passphraseOrPin, byte[] salt) throws NoSuchAlgorithmException, InvalidKeySpecException {
// Number of PBKDF2 hardening rounds to use. Larger values increase
// computation time. You should select a value that causes computation
// to take >100ms.
final int iterations = 1000;
// Generate a 256-bit key
final int outputKeyLength = 256;
SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
KeySpec keySpec = new PBEKeySpec(passphraseOrPin, salt, iterations, outputKeyLength);
SecretKey secretKey = secretKeyFactory.generateSecret(keySpec);
return secretKey;
}
答案 0 :(得分：4)
salt必须与创建密钥时要散列的变量相同。
变量可以保持相同，相同的用户/用户密码，但是您的代码正在重新生成随机盐。
如果您使用密钥加密数据库，则密钥必须相同，因此salt必须相同。
我希望这有帮助！
答案 1 :(得分：3)
我得到的错误是因为使用另一个SecureRandom为盐重新生成的关键。因此，在崩溃后，密钥不匹配。 Mark建议使用用户首次使用该应用时必须输入的无保留用户密码。此外，应用程序必须保持SqlOpenHelper对象，该对象依次保留数据库和密钥。