LauncherIcarus/LauncherIcarus/Daemon/EncryptionHelper.cs

using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;

namespace LauncherIcarus.Daemon
{
    public static class EncryptionHelper
    {
        private const string Password = "N1PEUPQX";

        private static Rfc2898DeriveBytes Rfc2898DeriveBytes { get; } = new Rfc2898DeriveBytes(Password, new byte[]
        {
            73,
            118,
            97,
            110,
            32,
            77,
            101,
            100,
            118,
            101,
            100,
            101,
            118
        });

        public static string Encrypt(string clearText)
        {
            var bytes = Encoding.Unicode.GetBytes(clearText);
            using (var aes = Aes.Create())
            {
                aes.Key = Rfc2898DeriveBytes.GetBytes(32);
                aes.IV = Rfc2898DeriveBytes.GetBytes(16);
                using (var memoryStream = new MemoryStream())
                {
                    using (var cryptoStream =
                           new CryptoStream(memoryStream, aes.CreateEncryptor(), CryptoStreamMode.Write))
                    {
                        cryptoStream.Write(bytes, 0, bytes.Length);
                        cryptoStream.Close();
                    }

                    clearText = Convert.ToBase64String(memoryStream.ToArray());
                }
            }

            return clearText;
        }

        public static string Decrypt(string cipherText)
        {
            cipherText = cipherText.Replace(" ", "+");
            var buffer = Convert.FromBase64String(cipherText);
            using (var aes = Aes.Create())
            {
                aes.Key = Rfc2898DeriveBytes.GetBytes(32);
                aes.IV = Rfc2898DeriveBytes.GetBytes(16);
                using (var memoryStream = new MemoryStream())
                {
                    using (var cryptoStream =
                           new CryptoStream(memoryStream, aes.CreateDecryptor(), CryptoStreamMode.Write))
                    {
                        cryptoStream.Write(buffer, 0, buffer.Length);
                        cryptoStream.Close();
                    }

                    cipherText = Encoding.Unicode.GetString(memoryStream.ToArray());
                }
            }

            return cipherText;
        }
    }
}