c# rijndaelmanaged在.NET框架中的使用示例

RijndaelManaged类是.NET框架中用于对称加密和解密数据的类。下面是一个简单的示例，演示如何使用RijndaelManaged类进行数据加密和解密：

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

public class Program
{
    static void Main()
    {
        string plainText = "Hello, world!";
        string key = "0123456789abcdef";
        string iv = "fedcba9876543210";

        byte[] encryptedData = EncryptData(plainText, key, iv);
        string decryptedText = DecryptData(encryptedData, key, iv);

        Console.WriteLine("Encrypted Data: " + Convert.ToBase64String(encryptedData));
        Console.WriteLine("Decrypted Text: " + decryptedText);
    }

    static byte[] EncryptData(string plainText, string key, string iv)
    {
        using (RijndaelManaged rijndael = new RijndaelManaged())
        {
            rijndael.Key = Encoding.UTF8.GetBytes(key);
            rijndael.IV = Encoding.UTF8.GetBytes(iv);

            ICryptoTransform encryptor = rijndael.CreateEncryptor(rijndael.Key, rijndael.IV);

            using (MemoryStream ms = new MemoryStream())
            {
                using (CryptoStream cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write))
                {
                    byte[] plainBytes = Encoding.UTF8.GetBytes(plainText);
                    cs.Write(plainBytes, 0, plainBytes.Length);
                }

                return ms.ToArray();
            }
        }
    }

    static string DecryptData(byte[] encryptedData, string key, string iv)
    {
        using (RijndaelManaged rijndael = new RijndaelManaged())
        {
            rijndael.Key = Encoding.UTF8.GetBytes(key);
            rijndael.IV = Encoding.UTF8.GetBytes(iv);

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

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

在上面的示例中，我们定义了EncryptData和DecryptData两个方法来分别进行数据的加密和解密。在Main方法中，我们演示了如何使用这两个方法来加密和解密数据。请注意，需要提供一个密钥和初始化向量（IV）来进行加密和解密操作。