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

public class AesHelper
{
    public static string Encrypt(string text, string key, string iv = "")
    {
        byte[] textBytes = Encoding.UTF8.GetBytes(text);

        using (Aes aes = Aes.Create())
        {
            aes.Key = SHA256.Create().ComputeHash(Encoding.UTF8.GetBytes(key));
            aes.IV = MD5.Create().ComputeHash(Encoding.UTF8.GetBytes(iv));

            ICryptoTransform encryptor = aes.CreateEncryptor();
            byte[] encryptedBytes = encryptor.TransformFinalBlock(textBytes, 0, textBytes.Length);

            return Convert.ToBase64String(encryptedBytes);
        }
    }

    public static string Decrypt(string text, string key, string iv = "")
    {
        byte[] textBytes = Convert.FromBase64String(text);

        using (Aes aes = Aes.Create())
        {
            aes.Key = SHA256.Create().ComputeHash(Encoding.UTF8.GetBytes(key));
            aes.IV = MD5.Create().ComputeHash(Encoding.UTF8.GetBytes(iv));

            ICryptoTransform decryptor = aes.CreateDecryptor();
            byte[] decryptedBytes = decryptor.TransformFinalBlock(textBytes, 0, textBytes.Length);

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

Console.Write("请输入要加密的文本：");
string text = Console.ReadLine();

Console.Write("请输入密钥（Key）：");
string key = Console.ReadLine();

Console.Write("请输入初始化向量（IV）：");
string iv = Console.ReadLine();

string encrypted = AesHelper.Encrypt(text, key, iv);
Console.WriteLine("【加密结果】{0}", encrypted);

string decrypted = AesHelper.Decrypt(encrypted, key, iv);
Console.WriteLine("【解密结果】{0}", decrypted);