For a colleague's convenience I built a small desktop program that receives as input a .CER file and a .p12 file and transforms them into the proper .PEM format that Apple needs for iOS Push Notifications as described in this tutorial.
It actually just executes console commands to convert both files into a single .PEM file which lately will be used to sign the Push Notifications.
In my interface I got a NSTextField where the user can write the iOS application Bundle Identifier since all the generated files will be using it as their name's prefix.
I realized that inside the original .CER file we can find the Bundle Identifier and I thought: hey, let's use that instead so my friend can't make any mistake.
So my question is if there is anyway at all to parse a .CER file in Objective-C in order to obtain the iOS application Bundle Identifier.