#include <iostream>
#include <fstream>
#include <vector>
#include <bitset>
#include <string>
#include <Windows.h>

using namespace std;

#define BIT 8
#define X 2
#define A 5
#define C 3
#define M 256

int GetRandom(int &x)
{
	int Xn = (A*X + C) % M;
	x = Xn;
	return Xn;
}

int to_xor(char a, char b)
{
	return ((a) + (b)) % 2;
}

int main()
{
	setlocale(LC_ALL, "RU");
	SetConsoleCP(1251);
	SetConsoleOutputCP(1251);

	int x = 2;

	vector<pair<string, string>> inputValues;
	vector<pair<string, string>> randValues;

	ifstream inputStream("C:/VSProjects/TI/lab2/input.txt");
	string input((istreambuf_iterator<char>(inputStream)), istreambuf_iterator<char>());
	inputStream.close();

	int randValue;
	string binary;

	for (int i = 0; i < input.length(); ++i)
	{
		binary = bitset<BIT>(input[i]).to_string();
		inputValues.emplace_back(to_string(input[i]), binary);

		//берём псевдослучайное значение

		randValue = GetRandom(x);
		binary = bitset<BIT>(randValue).to_string();
		randValues.emplace_back(to_string(randValue), binary);
	}

	vector<string> crypted;
	string number;
	char tmp;
	for (int i = 0; i < input.length(); ++i)
	{
		number = "";
		for (int j = 0; j < BIT; ++j)
		{
			tmp = to_xor(inputValues[i].second[j], randValues[i].second[j]);
			int q = tmp;
			number += to_string(q);
		}
		crypted.push_back(number);
	}

	int answer, temp;
	string cryptedText;
	for (int i = 0; i < input.length(); ++i)
	{
		cryptedText += (char)stoi(crypted[i], nullptr, 2);
	}

	//cout << cryptedText;

	for (int i = 0; i < cryptedText.length(); ++i)
	{
		binary = bitset<BIT>(cryptedText[i]).to_string();
		number = "";

		for (int j = 0; j < BIT; ++j)
		{
			temp = (int)to_xor(binary[j], randValues[i].second[j]);
			number += to_string(temp);
		}

		answer = stoi(number, nullptr, 2);
		cout << (char)answer;

	}

	return 0;
}