Protect the SQLite database

Hi all

In my application, I have a database that must be protected with a key to restrict other apps on this device to access.

The problem is that I can't get the key signature at run time: whatever I do (...) CodeSigningKey.get always returns null.

This is my code

        final CodeSigningKey key = CodeSigningKey.get(AbstractDB.class);
        if (key != null) {
            Log.d("+ GOT SIGNING KEY");
            final DatabaseSecurityOptions secopt = new DatabaseSecurityOptions(key);
            db = DatabaseFactory.create(name,  secopt);
        } else {
            Log.d("- SIGNING KEY IS NULL");
        }

I downloaded Signing Authority Tool and created a TEST.key use it and put it in {project_root}/keys/TEST.key in my Eclipse project

Also, I have TEST.key doule-click in Eclipse and class selected AbstractDB to be signed with it

I run my application on a real device, not in the Simulator

I run as follows

1. start debugging on a device - this introduces packaging and siging the .cod file. (However, in the signature tool window, I get a warning on my TEST.key: "Unregistered" and "please contact the signer and register with signing authority.")

2. with the signing authority tool, I sign my .cod file obtained in step 1 using my TEST.key

3. I click on debug on the device once more, sign tool signs the main .cod file again, and then the application will start on the device.

However, the key I get from CodeSigningKey.get (.) is always zero.

Do I did wrong

First of all, you need an instance of object in CodeSigningKey.get (...), like get (this). However, there is one thing, you should: If your object extends certain classes and/or implements interfaces, then ALL those who must be signed with the same key, in order to work. If no ancestor classes/interfaces is not signed, you get null.

This can be a problem if your hierarchy is deep enough. Information on classes are signed with keys that are stored in BlackBerry_App_Descriptor.xml and copied in the signature tool settings when you click on debug. It may happen that command line gets too long so the signing tool fails with the message "Invalid parameter" in the console.

So I extracted a class specially for the purposes of the signature:

final public class SignatureClass {    private static final SignatureClass INSTANCE = new SignatureClass();

    private SignatureClass(){}

    public static CodeSigningKey getKey(){        return CodeSigningKey.get(INSTANCE);    }}

I only sign this class with my key and use SignatureClass.getKey () to get the key.

PS: Also, if you move/rename the classes or the keys to verify this signature references in the BlackBerry_App_Descriptor.xml are valid. They are not being updated automatically.

Tags: BlackBerry Developers

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