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Well 'not worth it' is a bit of a stretch: you should add some sort of copy protection but to the point where you can stop what I call 'the office cracker': the person who skips lunch and tries to crack the software during that lunch because s/he thinks s/he can outsmart the software developer. Instead, spend more time on writing features for your paying customers than investing time in stopping non-paying customers.
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If you imagine if the string reference would be calculated at runtime using an encrypted block of code you decrypt at runtime it would be way harder to find it.īut in the end, it's not worth it.
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Things like the pop up and the license check pop up are the weak links here. If you want to do it at a higher level, you can use lambdas / function pointers and use these to call code like the pop up. you can go low level and use stack tricks, like do calculations on many different locations and jump between locations by push (which contains the results of your calculations) + (somewhere later) ret, to return to the address you just pushed, but what that is is only known at runtime. You can do a lot of things, but they take a lot of time to implement. I knew this already, but this really rang home just how easy it is for anyone to rip your OAuth keys or any other sensitive information out of your app. Again, lots of retain/release calls but this time it looks like the author of this library is managing memory without ARC.Īnother cool thing about Hopper (aside from the pseudocode which is terrific) is the graph modeĪnyhow, it's a neat piece of software and you can use it for lots of things besides cracking. You can see that they call into a third party library, iOS Artwork Extractor. Or you could say I did miss them, amirite?įinally I had a look at Sketch which looks to be written in Obj-C. You can also see ARC in action with all the retain/release calls. In any case you can see where Swift calls into some Objective-c libraries which i find interesting. Maybe because it is Swift which Hopper just started supporting. Maybe it's because this is a debug build. Of the three apps I opened, this one had the least readable pseudo code. Next I opened one of my own OS X Swift apps. Sublime looks to have C++ syntax in there.
The tutorial worked as expected (Yes, I own a Sublime license). I went through OP's article again, this time with the ability to export a binary and test the results. I figured Hopper would be a neat tool to have in the toolbox. Mainly on Microchip PIC, but some x86 experience and university stuff too. I have a fair amount of ASM experience from a decade ago. I went deep enough that I decided to plop the $99 down and buy Hopper. This article had me interested enough to download the Hopper demo and start following along.