#include <fstream>
#include <iostream>

using namespace std;

void set_passwd();
void encrypt_decrypt(ifstream&, ofstream&);

int main(){
    char ifile[100];
    char ofile[100];
    cout << "Input file to encrypt/decrypt: ";
    cin >> ifile;
    cout << "Input output file name: ";
    cin >> ofile;
    ifstream in(ifile);
    ofstream out(ofile);
    set_passwd();
    encrypt_decrypt(in, out);
}

void set_passwd(){
    char passwd[100];
    long seed = 0;
    int shift = 0;
    cout << "Enter Password (100 chars max): ";
    cin >> passwd;
    for(int i = 0; i < 100 && passwd[i] != 0; i++){
        seed ^= passwd[i] << shift;
	shift = (shift + 8)%32;
    }
    srand(seed);
}

void encrypt_decrypt(ifstream& in, ofstream &out){
    int data;
    while(in.peek() != EOF){
	data = in.get();
	out << char(data^int(rand()));
    }
}