Write-up: Basic conditional decision - CTF HoneyCON 2018 (Reversing challenge)

solve_rev3.c

#include <stdio.h>

void main() {

	char x[] = {0x68, 0x6F, 0x6F, 0x65, 0x79, 0x5F, 0x63, 0x6F, 0x6F};
	char y[] = {0x0B, 0X00, 0x00, 0x09, 0x03, 0x00, 0x1B, 0x00, 0x1D};
	char z[10];
	
	int i;
	char word, test;
	
	for(i = 0; i < 9; i++) {	
		
		for(word = 0x01; word < 0xFF; word++) {
			
			test = x[i] ^ word;
			
			if(test == y[i]) {
				
				z[i] = word;
				break;
				
			}
			
		}
		
	}
	
	z[9] = '\0';
	printf("FLAG --> %s\n", z);
	
}