SqliteRE (Regex-Encryption)

Customized version of Sqlite library supporting REGEXP and Encryption for Android. This project is a mix/merge of three other projects that are listed below.

How to build the native library

• Point to the directory src/main/
• Run the ndk-build in the command prompt
• move compiled native library from libs to jniLibs

How to use

Building this library project using gradle in command line or from Android Studio will produce .aar file , copy the sqlite.aar file to the libs directory of your own project, then add the line below to the dependencies section in the build.gradle :

compile ('com.mobilife.sqlitere:sqlitere@aar')

Now you just need to change import part of your code to import com.mobilife.sqlitere.database.sqlite.SQLiteDatabase; and anything else will remain exactly how you use normal android sqlite classes.

Regular Experssion Compare

you can use REGEXP operator to compare a field with a regex string

SELECT FirstName FROM Persons WHERE LastName REGEXP '^abc'

Encryption

PRAGMA key

• example usage: PRAGMA key='passphrase';

SQLiteDatabase db = SQLiteDatabase.openOrCreateDatabase(dbfile, null);
db.execSQL("PRAGMA key = 'passphrase'");

PRAGMA rekey

• example usage: PRAGMA rekey='passphrase';

SQLiteDatabase db = SQLiteDatabase.openOrCreateDatabase(dbfile, null);
db.execSQL("PRAGMA key = 'current passphrase'");
db.execSQL("PRAGMA rekey = 'new passphrase'");

• example of decrypting: PRAGMA rekey='';

SQLiteDatabase db = SQLiteDatabase.openOrCreateDatabase(dbfile, null);
db.execSQL("PRAGMA key = 'current passphrase'");
db.execSQL("PRAGMA rekey = ''");

Encrypting a new db - order

open          // <-- db is still plain text
key           // <-- db is now fully encrypted
use as usual

Opening an encrypted DB - order

open          // <-- db is fully encrypted
key           // <-- db is still fully encrypted
use as usual  // <-- read/written pages are fully encrypted and only decrypted in-memory

Changing the key - order

open          // <-- db is fully encrypted
key           // <-- db is still fully encrypted
rekey         // <-- db is still fully encrypted
use as usual  

Decrypting - order

open              // <-- db is fully encrypted
key               // <-- db is still fully encrypted
rekey with null   // <-- db is now fully decrypted to plain text
use as usual

References

-Android native and java helper classes :

https://sqlite.org/android/doc/trunk/www/index.wiki

-Encryption Module :

https://github.com/rindeal/SQLite3-Encryption

-Regexp Module :

https://github.com/litehelpers/Android-sqlite-native-driver-regexp-pcre

-This project uses sqlite amalgamation v3.12.2 , you can replace it with the lastest version from here :

https://github.com/liteglue/sqlite-amalgamation