using System;

using System.IO;

using System.Text;

using System.Security.Cryptography;

public class Program

{

    public static string Encrypt(string text, string key)

    {

        var _key = Encoding.UTF8.GetBytes(key);

        using (var aes = Aes.Create())

        {

            aes.Mode = CipherMode.CBC;

            using (var encryptor = aes.CreateEncryptor(_key, aes.IV))

            {

                using (var ms = new MemoryStream())

                {

                    using (var cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write))

                    {

                        using (var sw = new StreamWriter(cs))

                        {

                            sw.Write(text);

                        }

                    }

​

                    var iv = aes.IV;

                    var encrypted = ms.ToArray();

                    var result = new byte[iv.Length + encrypted.Length];

​

                    Buffer.BlockCopy(iv, 0, result, 0, iv.Length);

                    Buffer.BlockCopy(encrypted, 0, result, iv.Length, encrypted.Length);

​

                    return Convert.ToBase64String(result);

                }

            }

        }

    }

    public static string Decrypt(string encrypted, string key)

    {

        var b = Convert.FromBase64String(encrypted);

        var iv = new byte[16];

        var cipher = new byte[b.Length - 16];

​

        Buffer.BlockCopy(b, 0, iv, 0, iv.Length);

        Buffer.BlockCopy(b, iv.Length, cipher, 0, b.Length - iv.Length);

​

        var _key = Encoding.UTF8.GetBytes(key);

​

        using (var aes = Aes.Create())

        {

            aes.Mode = CipherMode.CBC;

            using (var decryptor = aes.CreateDecryptor(_key, iv))

            {

                var result = string.Empty;

​

                using (var ms = new MemoryStream(cipher))

                {

                    using (var cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Read))

                    {

                        using (var sr = new StreamReader(cs))

                        {

                            result = sr.ReadToEnd();

                        }

                    }

                }

​

                return result;

            }

        }

    }

    public static void Main()

    {

        var key = "as2wqww2WWSdw32ghdfsds!qvfFFsxc2";

        var payload = "elmir.muratovic@titanka.com#it#2022-03-30T15:03:26+02:00";

        var hash1 = "6JGv3wTRi5TKdoJzfN0TWo+afkaTEzfAUQ8rQLyI2FF+KUPZv9S24LA9b0LjIcHOOfLeSa0DWtCjIkdkp+3UKF5MvlNdH63SoB3AJocH+Io=";  // Generato da PHP

        var hash2 = Program.Encrypt(payload, key);

        Console.WriteLine("Hash1: " + hash1);

        Console.WriteLine("Descrypt: " + Program.Decrypt(hash1, key));

        Console.WriteLine("");

        Console.WriteLine("Hash2: " + hash2);

        Console.WriteLine("Descrypt: " + Program.Decrypt(hash2, key));

    }

}