obfus.h

obfus.h is a macro-only library for compile-time obfuscating C applications, designed specifically for the Tiny C (tcc). It is tailored for Windows x86 and x64 platforms and supports almost all versions of the compiler. Very reliable armor for your C programs!

• 🔍 Function Call Obfuscation: Confuse function calls to make your code less readable to unauthorized eyes.
• 🛡️ Anti-Debugging Techniques: Built-in mechanisms to prevent code analysis during runtime.
• 🔄 Control Flow Code Mutation: Turns code into spaghetti, making it difficult to parse conditions and loops.
• 🚫 Anti-Decompilation Techniques: Makes many popular decompilers useless visually breaking their output.
• 😈 Fake Signatures Adding: Can add fake signatures of various packers and protectors to confuse reverse engineers.

Usage

Integrating obfus.h into your project is a simple process. Just include the following line in your code:

#include "obfus.h"

This will automatically obfuscate your code during compilation, ensuring protection and confidentiality of your intellectual property.

Available options for protection configuring:

// Additional options
#define cflow_v2       1  // More powerful Control Flow obfuscation (slowly!)
#define antidebug_v2   1  // Use better dynamic anti-debugging protection
#define fake_signs     1  // Adds fake signatures of various protectors or packers

// Disabling default features
#define no_cflow       1  // Don't use Control-Flow obfuscation
#define no_antidebug   1  // Don't build in debugging protection

or use it with compiler args:

tcc "app.c" -w  -D no_cflow  -D antidebug_v2  -D fake_signs

⚠️ When compiling an application with obfuscation, use the -w argument to suppress warnings. Otherwise, the console will display numerous intimidating logs that have no impact on the final result. There's no need to be alarmed by them.

Example

// Let's obfuscate your code!

#include <stdio.h>

#define cflow_v2     1 // [+] ControlFlow v2
#define fake_signs   1 // [+] Fake signatures
#define antidebug_v2 1 // [+] AntiDebug v2
#define no_cflow     0 // [-] Disable ControlFlow
#define no_antidebug 0 // [-] Disable AntiDebug

#include "obfus.h"

void main() {
    char *out = malloc(256);

    strcpy(out, "Hello, world!");

    if (out) {
        printf(out);
    } else {
        printf("Error!");
    }
}

Version

The latest version of Tiny C (0.9.27) is recommended for use. Unfortunately, some versions of the compiler do not support the functionality needed to completely obfuscation.

Special thanks

Thanks to everyone who helped in the development of this project. I appreciate it! ❤️

• 👨🏼‍💻 @horsicq (for help with the code and advices)
• 🦊 @ac3ss0r (for cool ideas and their solutions)