![]() ![]() A lot of Foundation API has counterpart in CoreFoundation (CFString, CFArray, CFDictionary, …).Hard to swizzle implementation (no legal ways).In disassembled code (if there’s no debug symbols) C functions and structures Main aspects.Add $(DERIVED_FILE_DIR) to header search paths.Update #import sections with obfuscated.Problems to know about: ✓ Debug and crash report hell ✓ KVC ✓ Use property via getter/setter (is…, set…) ✓ Xib file compatibility ✓ Method inheritance.Better to obfuscate code for each build.Mangles class/protocol, method, function, variable.Direct messaging objc_msgSend objc_msgSend_stret.Storing hidden value objc_setAssociatedObject objc_getAssociatedObject.Method swizzling class_getClassMethod class_getInstanceMethod class_replaceMethodĬlass_addMethod class_getMethodImplementation method_exchangeImplementations ….Objc_allocateClassPair objc_registerClassPair class_addProtocol class_addIvar class_addProperty … Q: Why do we need to know about this? A:Īn attacker can use this to crack your application and you can use it to hide licensing.class-dump - a command line utility for getting all info about classes and protocols used in binary files.lldb/gdb - a system debugger Open source.Forums with fellows that can help you Reverse engineering in a nutshell You need ‣.Articles about reverse engineering Reverse engineering in a nutshell You need ‣ ‣.Toolkit that contains a disassembler and a debugger Toolkit that contains a disassembler and a debugger Reverse engineering in a nutshell You need Basic knowledge of asm for better understanding.Basic knowledge of asm for better understanding Reverse engineering.Software reverse engineering involves reversing a program's machine codeīack into the source code that it was written in, using program language statements.Objective-C classes and methods names, used constant strings, linked libraries and frameworks, etc. It consists of a header, load commands and data.It’s a binary stream of bytes grouped in meaningful data chunks.To make a better code protection you should become an attackerįor executables used by macOS, iOS and other systems based on Mach kernelįor executables used by macOS, iOS and other systems based on Mach kernel.The more time you spend on app securing, the more time it takes an attacker to crack it.A concurrent app starts using the same algorithm you’ve created.Site version has trial, licensing and validation mechanism for it.Receipt validation according to Apple’s documentation Another application (macOS / iOS) has brand new algorithm for doing something.We want to sell licenses for it and make money for creating more cool applications. ![]() Reverse engineering and tools in a nutshell ![]()
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