# SQLCipher for Android

SQLCipher for Android provides a library replacement for `android.database.sqlite` on the Android platform for use on [SQLCipher](https://github.com/sqlcipher/sqlcipher) databases. This library is based on the upstream [Android Bindings](https://www.sqlite.org/android/doc/trunk/www/index.wiki) project and aims to be a long-term replacement for the original [SQLCipher for Android](https://github.com/sqlcipher/android-database-sqlcipher) library.

### Compatibility

SQLCipher for Android supports Android API 21 and up on `armeabi-v7a`, `x86`, `x86_64`, and `arm64_v8a` architectures.

### Contributions

We welcome contributions, to contribute to SQLCipher for Android, a [contributor agreement](https://www.zetetic.net/contributions/) needs to be submitted. All submissions should be based on the `master` branch.


### Application Integration

Add a local reference to the local library and dependency:

```groovy
implementation files('libs/sqlcipher-android-4.6.0-S1-release.aar')
implementation 'androidx.sqlite:sqlite:2.2.0'
```

or source a Community edition build from Maven Central:

```groovy
implementation 'net.zetetic:sqlcipher-android:4.6.0-S1@aar'
implementation 'androidx.sqlite:sqlite:2.2.0'
```

```java
import net.zetetic.database.sqlcipher.SQLiteDatabase;

System.loadLibrary("sqlcipher");
SQLiteDatabase database = SQLiteDatabase.openOrCreateDatabase(databaseFile, password, null, null, null);
```

### Pre/Post Key Operations

To perform operations on the database instance immediately before or after the keying operation is performed, provide a `SQLiteDatabaseHook` instance when creating your database connection:

```java
SQLiteDatabaseHook hook = new SQLiteDatabaseHook() {
      public void preKey(SQLiteConnection connection) { }
      public void postKey(SQLiteConnection connection) { }
    };
```

### API Usage

There are two main options for using SQLCipher for Android within an Application:

1. [Using the SQLCipher for Android classes](#sqlcipher-for-android-classes)
2. [Using SQLCipher for Android in conjunction with the Android Room API](#sqlcipher-for-android-room-integration)

In both cases, prior to using any portion of the SQLCipher for Android library, the native SQLCipher core library must be loaded into the running application process. The SQLCipher core library is bundled within the AAR of SQLCipher for Android, however, the developer must load this library explicitly. An example below:

```java
System.loadLibrary("sqlcipher");
```

#### SQLCipher for Android classes

SQLCipher for Android provides two classes for opening and access database files. The `SQLiteDatabase` provides static methods for opening/creating database files and general data access.
Additionally, applications may choose to subclass the `SQLiteOpenHelper` class which provides mechanisms for performing database migrations, as well as general data access.

#### SQLCipher for Android Room Integration

SQLCipher for Android may also integrate with the Room API via the `SupportOpenHelperFactory`, an example is given below:

```java
System.loadLibrary("sqlcipher");
String password = "Password1!";
File databaseFile = context.getDatabasePath("demo.db");
SupportOpenHelperFactory factory = new SupportOpenHelperFactory("password.getBytes(StandardCharsets.UTF_8));
db = Room.databaseBuilder(context, AppDatabase.class, databaseFile.getAbsolutePath())
        .openHelperFactory(factory).build();
```

### Building 

## Android NDK

Currently, SQLCipher for Android uses NDK version "25.2.9519653".

## External dependencies

This repository is not batteries-included. Specifically, you will need to build `libcrypto.a`, the static library from OpenSSL using the NDK for the [supported platforms](#compatibility), and bundle the top-level `include` folder from OpenSSL. Additionally, you will need to build a SQLCipher amalgamation. These files will need to be placed in the following locations:

```
<project-root>/sqlcipher/src/main/jni/sqlcipher/android-libs/armeabi-v7a/libcrypto.a
<project-root>/sqlcipher/src/main/jni/sqlcipher/android-libs/x86/libcrypto.a
<project-root>/sqlcipher/src/main/jni/sqlcipher/android-libs/x86_64/libcrypto.a
<project-root>/sqlcipher/src/main/jni/sqlcipher/android-libs/arm64_v8a/libcrypto.a
<project-root>/sqlcipher/src/main/jni/sqlcipher/android-libs/include/
<project-root>/sqlcipher/src/main/jni/sqlcipher/sqlite3.c
<project-root>/sqlcipher/src/main/jni/sqlcipher/sqlite3.h
```

To build the AAR package, either build directly within Android Studio, or from the command line:

```
./gradlew assembleRelease
```