加密c#中的Webclient数据

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

public class WebClientEncryptionExample
{
    private static readonly byte[] Key = Encoding.UTF8.GetBytes("YourSecretKey123"); // 16, 24, or 32 bytes long
    private static readonly byte[] IV = Encoding.UTF8.GetBytes("YourIVVector123"); // 16 bytes long

    public static void Main()
    {
        string url = "https://example.com/data";
        string encryptedData = DownloadEncryptedData(url);
        string decryptedData = DecryptData(encryptedData);

        Console.WriteLine("Decrypted Data: " + decryptedData);
    }

    private static string DownloadEncryptedData(string url)
    {
        using (WebClient client = new WebClient())
        {
            byte[] encryptedBytes = client.DownloadData(url);
            return Convert.ToBase64String(encryptedBytes);
        }
    }

    private static string DecryptData(string encryptedData)
    {
        byte[] encryptedBytes = Convert.FromBase64String(encryptedData);

        using (Aes aes = Aes.Create())
        {
            aes.Key = Key;
            aes.IV = IV;

            ICryptoTransform decryptor = aes.CreateDecryptor(aes.Key, aes.IV);

            using (MemoryStream ms = new MemoryStream(encryptedBytes))
            {
                using (CryptoStream cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Read))
                {
                    using (StreamReader sr = new StreamReader(cs))
                    {
                        return sr.ReadToEnd();
                    }
                }
            }
        }
    }
}