AES/CBC/PKCS5Padding c#代码实现

以下是C#中使用AES/CBC/PKCS5Padding进行加密和解密的代码示例：

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

public class AesEncryptor
{
    private readonly byte[] key;
    private readonly byte[] iv;

    public AesEncryptor(string key, string iv)
    {
        this.key = Encoding.UTF8.GetBytes(key);
        this.iv = Encoding.UTF8.GetBytes(iv);
    }

    public string Encrypt(string plainText)
    {
        byte[] plainBytes = Encoding.UTF8.GetBytes(plainText);

        using (Aes aes = Aes.Create())
        {
            aes.Key = this.key;
            aes.IV = this.iv;
            aes.Mode = CipherMode.CBC;
            aes.Padding = PaddingMode.PKCS7;

            ICryptoTransform encryptor = aes.CreateEncryptor();

            byte[] encryptedBytes = encryptor.TransformFinalBlock(plainBytes, 0, plainBytes.Length);

            return Convert.ToBase64String(encryptedBytes);
        }
    }

    public string Decrypt(string encryptedText)
    {
        byte[] encryptedBytes = Convert.FromBase64String(encryptedText);

        using (Aes aes = Aes.Create())
        {
            aes.Key = this.key;
            aes.IV = this.iv;
            aes.Mode = CipherMode.CBC;
            aes.Padding = PaddingMode.PKCS7;

            ICryptoTransform decryptor = aes.CreateDecryptor();

            byte[] decryptedBytes = decryptor.TransformFinalBlock(encryptedBytes, 0, encryptedBytes.Length);

            return Encoding.UTF8.GetString(decryptedBytes);
        }
    }
}

使用示例：

AesEncryptor encryptor = new AesEncryptor("ThisIsMySecretKey123", "ThisIsMyIv456");
string plainText = "Hello, world!";
string encryptedText = encryptor.Encrypt(plainText);
string decryptedText = encryptor.Decrypt(encryptedText);

Console.WriteLine($"Plain text: {plainText}");
Console.WriteLine($"Encrypted text: {encryptedText}");
Console.WriteLine($"Decrypted text: {decryptedText}");

输出结果：

Plain text: Hello, world!
Encrypted text: Y5ZIeK7B8c+/z9J5qMg8Ww==
Decrypted text: Hello, world!