#include <stdio.h>
#include <string.h>

unsigned char encrypted[] = {
    0x07, 0x12, 0x0b, 0x16, 0x0a, 0x03, 0x01, 0x09, 0x39, 0x3a, 0x72,
    0x30, 0x1d, 0x2b, 0x11, 0x1d, 0x24, 0x17, 0x2c, 0x3f
};

int main() {
    unsigned char key;
    unsigned char decrypted[21] = { 0 };
    
    printf("Crypted text: \n");
    for(int i = 0; i < 20; i++) {
        printf("0x%02X", encrypted[i]);
    }
    puts("");
    printf("XOR HEX KEY: ");
    
    scanf("%hhx", &key);
    
    for(int i = 0; i < 20; i++) {
        decrypted[i] = encrypted[i] ^ key;
    }
    
    printf("Result: %s", decrypted);
    
    return 0;
}