llvm-obfuscation

LLVM control flow flattening prevents reverse engineering by transforming a function's CFG into a single dispatch loop, making automated analysis and reconstruction difficult. You apply it by wiring CFF passes into your compilation pipeline for selected functions.

Bogus control flow inserts opaque predicates to complicate graphs, while virtual machine protection (VMP) converts logic into embedded bytecode. VMP provides stronger anti-analysis by requiring attackers to build a specific emulator to deobfuscate execution.

You encrypt string literals at compile time by implementing a custom LLVM pass that substitutes strings with encrypted data arrays and injects runtime decryption routines. This data obfuscation increases uncertainty without changing intended behavior.

You can integrate OLLVM-style frameworks with an NDK toolchain by wiring custom obfuscation passes into the LLVM build pipeline. This allows you to apply string encryption and control flow transformations to C/C++ artifacts during compilation.

Mixed boolean-arithmetic (MBA) transforms increase binary size and runtime overhead by substituting simple operations with complex equivalent expressions. You must balance these performance costs against the desired level of anti-analysis protection.

You should avoid LLVM-based code virtualization when application performance is critical and execution overhead is unacceptable. VMP introduces significant runtime costs by converting native logic into embedded bytecode requiring an interpreter.