BetterAmongUs/Modules/Encryptor.cs

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

namespace BetterAmongUs.Modules;

class Encryptor
{
    private static readonly byte[] Key = Encoding.UTF8.GetBytes("0123456789ABCDEF0123456789ABCDEF");
    private static readonly byte[] IV = Encoding.UTF8.GetBytes("ABCDEF0123456789");

    internal static string Encrypt(string input)
    {
        using (Aes aes = Aes.Create())
        {
            aes.Key = Key;
            aes.IV = IV;

            using MemoryStream memoryStream = new();
            using CryptoStream cryptoStream = new(memoryStream, aes.CreateEncryptor(), CryptoStreamMode.Write);
            using (StreamWriter streamWriter = new(cryptoStream))
            {
                streamWriter.Write(input);
            }
            return Convert.ToBase64String(memoryStream.ToArray());
        }
    }

    internal static string Decrypt(string input)
    {
        using Aes aes = Aes.Create();
        aes.Key = Key;
        aes.IV = IV;

        using MemoryStream memoryStream = new(Convert.FromBase64String(input));
        using CryptoStream cryptoStream = new(memoryStream, aes.CreateDecryptor(), CryptoStreamMode.Read);
        using StreamReader streamReader = new(cryptoStream);
        return streamReader.ReadToEnd();
    }
}