How can I check the check that two packages are signed by the same key?

Question

One of my Android applications relies on another package to be installed as a license key. I could have gone with in-app purchases but key/license is the same for many of my apps.

In order to unlock some paid functionality in my app, I check for the existence of the package com.example.license. This works just fine but in order to add a an extra layer of rigidity, I would like to check that my package and the licence key package are signed by the same key be it debug or release. How can I check this? Is it as simple as calling PackageManager.checkSignatures?

Answer 1

here: Get certificate fingerprint from android app I've put some example how to get certificate from application. You just need to run this code against your app and the license package (just replace this.getPackageName with the com.example.license)