c# AES加密完成代码

在C#中，可以使用`System.Security.Cryptography.Aes`类来实现AES加密。以下是一个基本的示例，展示了如何创建一个AES密钥、初始化加密上下文并加密数据：

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

public static class AesEncryption
{
    public static string Encrypt(string plainText, string password)
    {
        byte[] salt = new byte[16]; // Salt for PBKDF2 key derivation
        using (RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider())
        {
            rng.GetBytes(salt);
        }

        byte[] keyAndIV = GenerateKeyAndIV(password, salt);

        using (Aes aes = Aes.Create())
        {
            aes.Key = keyAndIV.Take(16).ToArray(); // Key is first part of the derived bytes
            aes.IV = keyAndIV.Skip(16).Take(16).ToArray(); // IV is the second part

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

            using (MemoryStream ms = new MemoryStream())
            {
                using (CryptoStream cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write))
                using (StreamWriter sw = new StreamWriter(cs))
                {
                    sw.Write(plainText);
                }
                return Convert.ToBase64String(ms.ToArray());
            }
        }
    }

    private static byte[] GenerateKeyAndIV(string password, byte[] salt)
    {
        Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(password, salt);
        return pdb.GetBytes(32); // AES uses a 256-bit key, so we derive 32 bytes
    }

    // 示例：加密字符串
    public static void Main()
    {
        string plainText = "This is an example text to be encrypted.";
        string encryptedText = Encrypt(plainText, "MySecretPassword");
        Console.WriteLine("Encrypted Text: " + encryptedText);
    }
}

在这个例子中，我们首先生成一个随机盐值，然后使用`Rfc2898DeriveBytes`类从密码和盐值通过PBKDF2算法生成密钥和初始向量（IV）。接着，我们创建一个`Aes`对象，并设置其密钥和IV，然后使用`CreateEncryptor`方法创建一个加密器。最后，我们将明文写入加密流中。