#include <iostream>
#include <list>
#include <cstring>
#include <crypt.h>
using namespace std;
string target_salt = "$6$SvT3dVpN$";
string target_pw_hash = "$6$SvT3dVpN$lwb3GViLl0J0ntNk5BAWe2WtkbjSBMXtSkDCtZUkVhVPiz5X37WflWL4k3ZUusdoyh7IOUlSXE1jUHxIrg29p.";

char null[] = { '\0' };

#define MAX_LEN 10
list<char*> pwlist;

int check_password(char* pw, char* salt, char* hash)
{
    char* res = crypt(pw, salt);
    for (int i = 0; i < strlen(hash); i++)
        if (res[i] != hash[i]) return 0;
    cout << "match !!!" << "\n";
    cout << "password " << pw << "\n";
    cout << "hashes to " << res << "\n";
    return 1;
}


char* exhaustive_search(char* charset, char* salt, char* target)
{
    char* current_password;
    char* new_password;
    int i, current_len;

    for (i = 0; i < strlen(charset); i++) {
        new_password = new char[2];
        new_password[0] = charset[i];
        new_password[1] = '\0';
        pwlist.push_back(new_password);
    }
    while (true) {

        if (pwlist.empty()) return null;

        current_password = pwlist.front();
        current_len = strlen(current_password);

        if (check_password(current_password, salt, target))
            return current_password;


        if (current_len < MAX_LEN) {
            for (i = 0; i < strlen(charset); i++) {
                new_password = new char[current_len + 2];
                memcpy(new_password, current_password, current_len);
                if (new_password[current_len - 1] == '!' or new_password[current_len - 1] == '@' or new_password[current_len - 1] == '#')
                {
                    if(i>4)
                        new_password[current_len] = charset[i];
                }
                else
                    new_password[current_len] = charset[i];
                new_password[current_len + 1] = '\0';
                pwlist.push_back(new_password);
            }
        }

        pwlist.pop_front();
    }
}
int main()
{
    char* salt;
    char* target;
    char* password;

    char charset[] = { 'a', 'b', 'c', '1', '2', '!','@','#', '\0' };
    salt = new char[target_salt.length() + 1];
    copy(target_salt.begin(), target_salt.end(), salt);
    target = new char[target_pw_hash.length() + 1];
    copy(target_pw_hash.begin(), target_pw_hash.end(), target);

    password = exhaustive_search(charset, salt, target);
    if (strlen(password) != 0) cout << "Password successfuly recovered: " <<
        password << " \n";
    else cout << "Failure to find password, try distinct character set of size \n";
}