12 безопасность

#include "pch.h"
#include <fstream>
#include <string>
#include <algorithm>
#include <iostream>



using namespace std;
//Объявляем массив символов русского и английского алфавита
string alpha = "абвгдеёжзийклмнопрстуфхцчшщъыьэюя,-.";
int code(char str)
{
	for (int i = 0; i < 33; i++) {
		if (str == alpha[i])
			return i;
	}
}

unsigned short lfsr = 0xACE1u;
unsigned bit;
unsigned period = 0;

int main() {
	system("chcp 1251");
	system("cls");
	setlocale(LC_ALL, "Russian");
	ifstream start("start.txt");
	ofstream output("out.txt");
	char alphaB[30][2] = { ' ' };
	string message;
	int keym[10];
	string keybuf;
	string key;
	getline(start, key);
	getline(start, message);
	cout << endl;
	int o;
	int ukazi = 0;
	int ukazj = 0;
	//for (int i = 0; i < 100000; ++i)
		//cout <<  <<endl;
	uint16_t start_state = 0xACE1u;  /* Any nonzero start state will work. */
	uint16_t lfsr = 1;
	while (!key.empty()) {
		lfsr*=code(key[0]);
		key.erase(0,1);
	}
	uint16_t bit;                    /* Must be 16bit to allow bit<<15 later in the code */
	for (int i = 0; i < 10; ++i)
	{
		while (lfsr != rand()) {
			bit = ((lfsr >> 0) ^ (lfsr >> 2) ^ (lfsr >> 3) ^ (lfsr >> 5)) & 1;
			lfsr = (lfsr >> 1) | (bit << 15);
			++period;
		}
		cout << period%33<<endl;
		keym[i] = period % 33;
	}
	string decode;
	for (int i = 0; i < message.length(); ++i) {
		char buf = (message[i] ^ keym[i%10]);
		output << buf << ' ';
		decode += buf;
	}

	cout << endl << decode<<endl;
	for (int i = 0; i < decode.length(); ++i) {
		char buf = (decode[i] ^ keym[i%10]);
		cout << buf ;
	}
	cout << endl;
	system("pause");
	return 0;
}