aes256Decrypt in C#

app.cs

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

namespace ConsoleApp
{
    internal class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(Decrypt(new byte[] { 0x37, 0x21, 0xa5, 0xd1, 0xd2, 0x26, 0x78, 0x48, 0x89, 0xd6, 0xe3, 0x42, 0x33, 0x7c, 0x12, 0x9a }, "MYSUPERSECRECTKEYDONTLEAKIT!!!!!"));
            Console.WriteLine(Encrypt("my secrect code", "MYSUPERSECRECTKEYDONTLEAKIT!!!!!"));
        }

        public static string Encrypt(string plainText, string keyString)
        {
            byte[] cipherData;
            byte[] key = Encoding.UTF8.GetBytes(keyString);
            // resize like WinCC OA
            Array.Resize(ref key, 32);
            Aes aes = Aes.Create();
            aes.Mode = CipherMode.CBC;
            aes.Padding = PaddingMode.Zeros;
            aes.Key = key;
            aes.IV = new byte[16];
            ICryptoTransform cipher = aes.CreateEncryptor(aes.Key, aes.IV);

            using (MemoryStream ms = new MemoryStream())
            {
                using (CryptoStream cs = new CryptoStream(ms, cipher, CryptoStreamMode.Write))
                {
                    using (StreamWriter sw = new StreamWriter(cs))
                    {
                        sw.Write(plainText);
                    }
                }

                cipherData = ms.ToArray();
            }

            return Convert.ToHexString(cipherData);
        }

        public static string Decrypt(byte[] combinedData, string keyString)
        {
            string plainText;
            byte[] key = Encoding.UTF8.GetBytes(keyString);
            // resize like WinCC OA
            Array.Resize(ref key, 32);
            Aes aes = Aes.Create();
            aes.Mode = CipherMode.CBC;
            aes.Padding = PaddingMode.Zeros;
            aes.Key = key;
            aes.IV = new byte[16];
            ICryptoTransform decipher = aes.CreateDecryptor(aes.Key, aes.IV);

            using (MemoryStream ms = new MemoryStream(combinedData))
            {
                using (CryptoStream cs = new CryptoStream(ms, decipher, CryptoStreamMode.Read))
                {
                    using (StreamReader sr = new StreamReader(cs))
                    {
                        plainText = sr.ReadToEnd();
                    }
                }

                return plainText;
            }

        }

    }
}

winccoa.cpp

main()
{
  string password;
  string enc = "3721A5D1D226784889D6E342337C129A";
  aes256Decrypt((blob)enc, "MYSUPERSECRECTKEYDONTLEAKIT!!!!!", password);
}