Key_Recover.cpp

#include <iostream>
#include <fstream>
#include <shlwapi.h>
#include <string>

#pragma comment( lib, "shlwapi.lib")

using namespace std;

int main(int argc, char* argv[])
{
    ifstream keyFile("key.dat", ios_base::binary);
    string header = "";
    string key = "";
    if(!keyFile.is_open())
        return 0;
    getline(keyFile, header);
    getline(keyFile, key);
    keyFile.close();
    char keyDat[18];
    sprintf_s(keyDat, 18, "%s", key.c_str());
    printf("Please input your plain-text key. DO NOT use dashes in this key. Make sure it is one word.\n");
    char keyRaw[18];
    gets_s(keyRaw, 18);
    char keyDigest[18];
    for(int i = 0; i < 18; i++)
    {
        keyDigest[i] = (char) keyDat[i] ^ keyRaw[i];
    }
    ifstream lostKeyFile("keyLost.dat", ios_base::binary);
    getline(lostKeyFile, header);
    key = "";
    getline(lostKeyFile, key);
    sprintf_s(keyDat, 18, "%s", key.c_str());
    memset(keyRaw, 0x00, 18);
    for(int i = 0; i < 18; i++)
    {
        keyRaw[i] = (char) keyDat[i] ^ keyDigest[i];
    }
    printf("Your recovered key is: %s\n", keyRaw);
    keyFile.close();
    printf("Press Enter to save this key to out.txt and close the program.");
    cin.ignore();
    ofstream outFile("out.txt");
    outFile.write(keyRaw, 17);
    outFile.close();
    return 1;
}