AvaloniaProject/ApplicationAvalonia/Utilities/EnryptionClass.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace ApplicationAvalonia.Utilities
{
    public static class EncryptionClass
    {

        public static byte[] Encrypt(string simpleText, byte[] key, byte[] iv)
        {
            byte[] cipheredText;

            using (Aes aes = Aes.Create())
            {
                ICryptoTransform encryptor = aes.CreateEncryptor(key, iv);

                using (MemoryStream memoryStream = new MemoryStream())
                {

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

                        using (StreamWriter streamWriter = new StreamWriter(cryptoStream))
                        {
                            streamWriter.Write(simpleText);                        
                        }

                        cipheredText = memoryStream.ToArray();

                    }

                }

            }

            return cipheredText;
        }


        public static string Decrypt(byte[] cipheretext, byte[] key, byte[] iv)
        {
            string simpleText = String.Empty;


            using (Aes aes = Aes.Create())
            {
                ICryptoTransform decryptor = aes.CreateDecryptor(key, iv);

                using (MemoryStream memoryStream = new MemoryStream(cipheretext)) 
                {

                    using (CryptoStream cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read))
                    {

                        using (StreamReader streamReader = new StreamReader(cryptoStream))
                        {
                            simpleText = streamReader.ReadToEnd();
                        }

                    }

                }

            }

            return simpleText;
        }


    }
}