using System;

using System.IO;

using System.Security.Cryptography;

using System.Text;

using Microsoft.Extensions.Options;

public class Program

{

    public static void Main()

    {

        //This is the string we need to encode

        var plainText = "10bab7f7-1057-4234-824a-1f1988bbdc57";

        var salt = Encoding.ASCII.GetBytes("hgt!16kl");

        var keySize = 256;

        var passPhrase = "gsKnGZ041HLL4IM8";

        var plainTextBytes = Encoding.UTF8.GetBytes(plainText);

        var initVectorBytes = Encoding.ASCII.GetBytes("jkE49230Tf093b42");

        using (var password = new Rfc2898DeriveBytes(passPhrase, salt))

        {

            var keyBytes = password.GetBytes(keySize / 8);

            using (var symmetricKey = Aes.Create())

            {

                symmetricKey.Mode = CipherMode.CBC;

                using (var encryptor = symmetricKey.CreateEncryptor(keyBytes, initVectorBytes))

                {

                    using (var memoryStream = new MemoryStream())

                    {

                        using (var cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write))

                        {

                            cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);

                            cryptoStream.FlushFinalBlock();

                            var cipherTextBytes = memoryStream.ToArray();                           

                            Console.WriteLine($"{plainText} is encoded. Find the value below");

                            Console.WriteLine(Convert.ToBase64String(cipherTextBytes));

                        }

                    }

                }

            }

        }

    }

}