sbox - Compile-time AES string obfuscation for C++

Standard solutions rely on length + "#" + string. That is trivial to reverse. sbox utilizes a constexpr AES-128 block cipher to mutate strings into high-entropy noise.

The Story

During the Neetcode "Encode and Decode Strings" challenge, I ported the AES engine from my obfuscation project, Obfusk8.

The implementation passed in 7ms on the first submission. Cryptographic security shouldn't be a trade-off for performance.

Features

• No Delimiters: Fixed-width headers and block mutation replace predictable separators.
• Binary Safe: Effortlessly handles raw payloads and null bytes.
• Static Stealth: Plaintext is eliminated at compile-time. Using the provided macros, strings.exe (or strings in linux) returns zero results.

How to Use

Check the EXAMPLES folder for implementation details:

1. Multi-String Example (sbox_test.cpp): Demonstrates how to handle a vector<string> using the _OBF(str) macro for batch processing. Useful for transit-ready obfuscation.

2. Single String Example (sbox_test1.cpp): Demonstrates atomic materialization using the ObfStr(str) macro. Best for single variable assignments:

   string s = ObfStr("ama obfuscation addicted");
   

Performance

7ms runtime. Proving that overkill can still be optimal.

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Author: x86byte