Crackme Z

main.c

#include <stdio.h>
#include "to_think.h"

#define ERRO "You can't pass through here!"
#define NOTSUCCESS "Hey, are you sure ? Do you forgetting something ?"
#define LOOKMEM "You definitely should think about this a little longer."
#define WHOLE "It's easy, c'mon! I know that you can do it!"

char nkey[26] = {0x0};
char npass[22] = {0x0};

void (*p)();
void (*z)(char);
void (*y)();

void print_for_me_please(){
    puts(ERRO);
}

void print_for_me_sir(char *x){
    puts(x);
}

void wanna_beef(){
    char key[5]   = { 0xb, 0xe, 0xe, 0xf, 0x0 };

    puts("Want some...");

    for(int i=0; i<sizeof(key); i++){
        if(key[i]!=0x0){
            printf("%2x", key[i]);
        }
    }

    puts(" ? ");

    if(nkey[0]==0xf){
        puts(ERRO);
    }
}

void secret_main(){
    char key_n_key[22] = { 0x66 + 0x2, 0x6c + 0x2, 0x61 + 0x2, 0x67 + 0x2, 0x28 + 0x2, 0x2e + 0x2, 0x2e + 0x2, 0x2e + 0x2, 0x6e + 0x2, 0x6f + 0x2, 0x74 + 0x2, 0x72 + 0x2, 0x65 + 0x2, 0x61 + 0x2, 0x6c + 0x2, 0x6f + 0x2, 0x6e + 0x2, 0x65 + 0x2, 0x21 + 0x2, 0x21 + 0x2, 0x21 + 0x2, 0x29 + 0x2 };
    
    wanna_beef();

    if((nkey[0]>0x31 && nkey[0]<0x33) && nkey[1]==0xc && nkey[3]==0x7a){
        z(nkey[0]);
        return;
    }

    for(int a=0;a<sizeof(key_n_key);a++){
        key_n_key[a] = key_n_key[a]-0x2;
        nkey[a] = key_n_key[a];
    }

    puts(NOTSUCCESS);
}

void grab_my_pass_to_release_the_kraken(){
    char key_n_key[46] = { 0x50 + 0x20, 0x6c + 0x20, 0x65 + 0x20, 0x61 + 0x20, 0x73 + 0x20, 0x65 + 0x20, 0x5f + 0x20, 0x53 + 0x20, 0x69 + 0x20, 0x72 + 0x20, 0x5f + 0x20, 0x57 + 0x20, 0x68 + 0x20, 0x61 + 0x20, 0x74 + 0x20, 0x5f + 0x20, 0x49 + 0x20, 0x73 + 0x20, 0x5f + 0x20, 0x54 + 0x20, 0x68 + 0x20, 0x65 + 0x20, 0x5f + 0x20, 0x50 + 0x20, 0x61 + 0x20, 0x73 + 0x20, 0x73 + 0x20, 0x77 + 0x20, 0x6f + 0x20, 0x72 + 0x20, 0x64 + 0x20, 0x5f + 0x20, 0x54 + 0x20, 0x6f + 0x20, 0x5f + 0x20, 0x52 + 0x20, 0x65 + 0x20, 0x6c + 0x20, 0x65 + 0x20, 0x61 + 0x20, 0x73 + 0x20, 0x65 + 0x20, 0x5f + 0x20, 0x4d + 0x20, 0x65+ 0x20, 0x3a + 0x20 };
    int a              = 0;
    int z              = 13;
    //to_think_about

    for(int i=0; i<sizeof(key_n_key); i++){
        key_n_key[i] = key_n_key[i] - 0x20;
    }

    puts(key_n_key);
    scanf("%s", npass);

    for(int i=0; i<=(4+9); i++){
        if(a<=3){
            if(npass[i] != nkey[a]){
                puts(WHOLE);
                break;
            }
        } else if(a>3 && a<13){
            if(npass[i] != nkey[z]){
                puts(WHOLE);
                break;
            }
            z++;
        } else if(i>=(4+9)){
            for(int aa=0; aa<sizeof(to_think_about); aa++){
                if(to_think_about[aa] != 0x0){
                    to_think_about[aa] = to_think_about[aa] - 0x20;
                }
            }
            print_for_me_sir("");
            puts(nkey);
            print_for_me_sir("");
            puts(to_think_about);
            print_for_me_sir("");
            return;
        }
        a++;
    }

    return;
}

void middle_secret(char c){
    char key_n_key[27] = { 0x66 ^ 0x2, 0x6c ^ 0x2, 0x61 ^ 0x2, 0x67 ^ 0x2, 0x28 ^ 0x2, 0x2e ^ 0x2, 0x2e ^ 0x2, 0x2e ^ 0x2, 0x31 ^ 0x2, 0x33 ^ 0x2, 0x33 ^ 0x2, 0x37 ^ 0x2, 0x5f ^ 0x2, 0x4d ^ 0x2, 0x45 ^ 0x2, 0x4e ^ 0x2, 0x54 ^ 0x2, 0x45 ^ 0x2, 0x5f ^ 0x2, 0x42 ^ 0x2, 0x49 ^ 0x2, 0x4e ^ 0x2, 0x2e ^ 0x2, 0x2e ^ 0x2, 0x2e ^ 0x2, 0x29 ^ 0x2, 0x0 };

    for(int a=0;a<sizeof(key_n_key);a++){
        if(key_n_key[a]!=0){
            key_n_key[a] = key_n_key[a]^(c-0x30);
            nkey[a] = key_n_key[a];
        }
    }
    
    grab_my_pass_to_release_the_kraken();
}

int main(int argc, char *argv[]) {

    p = &secret_main;
    z = &middle_secret;
    y = &wanna_beef;
    nkey[2] = 0xa;
    nkey[3] = 0xb;

    if(argc <= 1){
        p = &wanna_beef;
        nkey[0] = 0xf;
        nkey[0] = 0xe;
        nkey[3] = 0xa;
    } else if(argc == 2){
        p = &secret_main;
        nkey[0] = *argv[1];
        nkey[1] = 0xa;
        nkey[3] = 0x6;
    } else if(argc == 3){
        p = &secret_main;
        nkey[0] = *argv[2];
        nkey[1] = 0xc;
        nkey[3] = *argv[1];
    }
    p();
}