Расшифровщик из AES Rijndael 256

using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
 
namespace Wpf1._0
{
  public class Cryptography
  {
    public const string key = "lkirwf897+22#bbtrm8814z5qq=498j5";
    public const string iv = "741952hheeyy66#cs!9hjv887mxx7@8y";
 
    public static string DecryptRJ256(string prm_key, string prm_iv, string prm_text_to_decrypt)
    {
      string s = prm_text_to_decrypt;
      RijndaelManaged rijndaelManaged = new RijndaelManaged();
      rijndaelManaged.Padding = PaddingMode.Zeros;
      rijndaelManaged.Mode = CipherMode.CBC;
      rijndaelManaged.KeySize = 256;
      rijndaelManaged.BlockSize = 256;
      ICryptoTransform decryptor = rijndaelManaged.CreateDecryptor(Encoding.ASCII.GetBytes(prm_key), Encoding.ASCII.GetBytes(prm_iv));
      byte[] buffer = Convert.FromBase64String(s);
      byte[] numArray = new byte[buffer.Length];
      new CryptoStream((Stream) new MemoryStream(buffer), decryptor, CryptoStreamMode.Read).Read(numArray, 0, numArray.Length);
      return Encoding.UTF8.GetString(numArray);
    }
 
    public static string EncryptRJ256(string prm_key, string prm_iv, string prm_text_to_encrypt)
    {
      string s = prm_text_to_encrypt;
      RijndaelManaged rijndaelManaged = new RijndaelManaged();
      rijndaelManaged.Padding = PaddingMode.Zeros;
      rijndaelManaged.Mode = CipherMode.CBC;
      rijndaelManaged.KeySize = 256;
      rijndaelManaged.BlockSize = 256;
      ICryptoTransform encryptor = rijndaelManaged.CreateEncryptor(Encoding.ASCII.GetBytes(prm_key), Encoding.ASCII.GetBytes(prm_iv));
      MemoryStream memoryStream = new MemoryStream();
      CryptoStream cryptoStream = new CryptoStream((Stream) memoryStream, encryptor, CryptoStreamMode.Write);
      byte[] bytes = Encoding.UTF8.GetBytes(s);
      cryptoStream.Write(bytes, 0, bytes.Length);
      cryptoStream.FlushFinalBlock();
      return Convert.ToBase64String(memoryStream.ToArray());
    }
 
    internal static void EncryptRJ256(string messageName) => throw new NotImplementedException();
  }
}