Rust Vs C

Reverse Engineering

What is C

  • General-purpose procedural programming language.
  • Designed in 1972 by Dennis Ritchie 
    • Designed to construct utilities running on Linux. 
  • "You control everything, including memory safety" 

What is Rust

  • Multi-paradigm programming language designed for productivity and performance. 
  • Syntactically similar to C++
  • Can guarantee memory safety through the borrow checker.
    • No garbage collection
    • Reference counting is optional

Properties of C

  • Procedural language
  • Statically typed
  • Manually manage memory
  • Errors both at compile and run time

Properties of Rust

  • Functional Programming Language
  • Dynamically typed
  • Explicit definition of mutable vs non-mutable variables
  • Ownership system
  • Errors caught at compile time
#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#include <stdlib.h>

bool pw_check(char *input) {
    char flag[] = {0x4d, 0x44, 0x46, 0x4e, 0x46, 0x56, 0x40, 0x46, 0x28, 0x7e, 0x63, 0x34, 0x73, 0x36, 0x76, 0x5a, 0x52, 0x30, 0x56, 0x5a, 0x51, 0x6d, 0x36, 0x5a, 0x47, 0x36, 0x76, 0x51, 0x5a, 0x56, 0x35, 0x69, 0x61, 0x34, 0x60, 0x77, 0x78};

    int inputLength = strlen(input); 
    int flagLength = strlen(flag);
    int i = 0;
    if (inputLength != flagLength) {
        return false;
    }

    for (i = 0; i < inputLength; i++) {
        if (input[i] != flag[i]) {
            return false;
        }
    }
    return true;
}

void operation_fives(char *input, char *output) {
    int inputLength = strlen(input);
    int i = 0;
    for (i = 0; i < inputLength; i++) {
        output[i] = input[i] ^ 5;
    }
}

int main(int argc, char **argv) {
    if (argc == 2) {
        char *input;
        char output[128];
        bool result;
        input = argv[1];
        operation_fives(input, output);

        result = pw_check(output);
        if (result == true) {
            printf("Success!\n"); 
        } else {
            printf("Failure!\n");
        }
    } else {
        printf("Invalid input!\n"); 
    }
    
}

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