TextCracker v.1.0

Well I think I've done the the most I can do with XOR, and it's time to move on to other encryptions. On realizing how pitifully weak XOR encryption are I have decided to release the full source for my TextCracker as well as the executable. Its time to move on to more advanced encryptions....

Full Source:
[PHP]
#include <iostream>
#include <fstream>
using namespace std;

void start();
void XOR_char_crack(char* str, bool brute);
bool encrypt(char *src, char *dest, char k);
bool filterStrings(unsigned char* str, int l);
bool brute = true;
int filter = 0;


int main()
{
start();
system("pause");
return 0;
}

void start(){
char filename1[50] = "";
char filename2[50] = "";
char key;
char choice;
char ch;
cout << "Would you like to crack a text file?\n" << endl;
cout << "q.) Quit\n";
cout << "1.) XOR ASCII Crack\n";
cout << "2.) Decrypt XOR ASCII with key\n";
cout << "3.) XOR Encrypt your own file\n";
cin >> choice;

switch(choice){
case 'q':
break;

case '1':
system("cls");
cout <<"Type the name of the file you want cracked: ";
cin >> filename1;

while(true)
{
cout <<"Try realistic keys? (keyboard characters) (y/n)\n";
cin >> ch;
if(ch == 'y' || ch =='Y'){brute = false; break;}
if(ch =='n' || ch =='N'){brute = true; break;}
else cout<<"Not a valid choice.\n";
}

for(bool exit = false; !exit; )
{
cout <<"Would you like to enable a filter? (y/n)";
cin >> ch;

switch(ch){
case 'y':
cout << "Select Filtration Level: \n";
cout << "1. Filter extended ASCII characters\n";
cout << "2. Target character strings only. (strings of letters)\n";
cin >> filter;
exit = true;
cout<<"\nWARNING: These results have been filtered.\n\n";
break;
case 'n':
filter = 0;
exit = true;
break;
default:
cout <<"Invalid option. Enter \'y\' for yes or \'n\' for no.\n";
break;
}
}
XOR_char_crack(filename1, brute);
system("pause");
system("cls");
start();
break;
case '2':
system("cls");
cout <<"Type the name of the file you want the decrypter to read: ";
cin >> filename1;
cout <<"Type the name of the file you would like to send the decrypted message to: ";
cin >> filename2;
cout << "What key is the message encrypted with?" << endl;
cin >> key;
if(encrypt(filename1, filename2, key)) cout <<"File successfully decrypted.\n";
else cout << "Decyprtion failed.\n";
system("pause");
system("cls");
start();
break;

case '3':
system("cls");
cout <<"Type the name of the file you want the encrypter to read: ";
cin >> filename1;
cout <<"Type the name of the file you would like to send the encrypted message to: ";
cin >> filename2;
cout << "What key would you like to encrypt this message in?" << endl;
cin >> key;
if(encrypt(filename1,filename2, key))cout <<"File successfully encrypted.\n";
else cout <<"Encryption failed.\n";
system("pause");
system("cls");
start();
break;

default:
system("cls");
start();
break;
}
}

void XOR_char_crack(char* str, bool brute)
{
fstream file(str, ios::binary | ios::in | ios:ut);
fstream dump("dump.txt", ios::in | ios:ut | ios::trunc);

if(!file)
{
cout << "ERROR. Cannot open specified file. File must be in same directory as decryptor.\n";
return;
}
if(!dump)
{
cout << "ERROR. Cannot open dump.txt file.\n";
return;
}

char ch;
unsigned char temp[20] = "";
unsigned char k = 0;
if(!brute)k=32;
do
{
for(int i=0; str[i]; i++)
{
file.get(ch);
temp[i] = (ch ^ k);
}
file.seekg(ios::beg);
if(filter)
{
if(filterStrings(temp, filter))
{
dump << "Key of: " << k << " Produces: " << temp << endl << endl;
cout << "Key of: " << k << " Produces: " << temp << endl << endl;
}
}
k++;
if(!brute && k> 126) break;
}while(k != 0);

return;
}

bool encrypt(char *src, char *dest, char k)
{
fstream ifile(src, ios::binary | ios::in | ios:ut);
fstream efile(dest, ios::binary | ios::in | ios:ut | ios::trunc);
unsigned char key = k;
char ch;

if(!ifile)
{
cout << "ERROR. Cannot open first file.\n";
return 0;
}
if(!efile)
{
cout << "ERROR. Cannot open second file.\n";
return 0;
}
cout << "Contents of file1:\n\n";
while(ifile)
{
ifile.get(ch);
if(ifile) cout << ch;
efile.put(ch^key);
}
cout << endl << endl;
cout << "The first file has been encrypted with a key of '" << key <<"' and saved to the second file.\n";
cout << "Encrypted message: \n\n";
efile.seekg(ios::beg);
while(efile)
{
efile.get(ch);
if(efile)cout << ch;
}
cout<< endl;
ifile.close();
efile.close();
cout << endl;
return 1;
}

bool filterStrings(unsigned char* str, int l)
{
int count = 0;
if (l == 0) return true;
else if (l == 1)
{


for(int i = 0; str[i]; i++)
{
if(str[i] >= 32 && str[i] <= 127)count++;
else count = 0;
if(count >= 3)return true;
}
}
else
{
for(int i = 0; str[i]; i++)
{
if(str[i] >= 65 && str[i] <= 122)count++;
else count = 0;
if(count >= 3)return true;
}
}
}

[/PHP]
Sorry I didn't comment my code.

I guess you guys can play around with it if you want... I know you get hours of fun from typing into a console.... =/