Task1.4

using System;
using System.Collections.Generic;
using System.Security.Cryptography;
using System.Text;

namespace PasswordHashing
{
    class Program
    {
        static readonly List<string> storedHashes = new List<string>();

        static void Main(string[] args)
        {
            Console.Write("Введите пароль: ");
            string password = Console.ReadLine();

            string hash = HashPassword(password);
            storedHashes.Add(hash);

            Console.WriteLine($"Пароль: {password}");
            Console.WriteLine($"Хэш: {hash}");

            Console.Write("\nВведите пароль для проверки:");
            string input = Console.ReadLine();

            if (VerifyPassword(input))
            {
                Console.ForegroundColor = ConsoleColor.Green;
                Console.WriteLine("Пароль верный!");
            }
            else
            {
                Console.ForegroundColor = ConsoleColor.Red;
                Console.WriteLine("Неверный пароль!");
            }

            Console.ResetColor();
        }

        static string HashPassword(string password)
        {
            using (SHA256 sha256 = SHA256.Create())
            {
                byte[] bytes = Encoding.UTF8.GetBytes(password);
                byte[] hashBytes = sha256.ComputeHash(bytes);

                StringBuilder builder = new StringBuilder();

                foreach (byte b in hashBytes)
                {
                    builder.Append(b.ToString("x2"));
                }

                return builder.ToString();
            }
        }

        static bool VerifyPassword(string inputPassword)
        {
            string inputHash = HashPassword(inputPassword);
            return storedHashes.Contains(inputHash);
        }
    }
}