Java中的AES加密和C#中的解密

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.security.SecureRandom;

public class AESEncryptionExample {

    public static void main(String[] args) throws Exception {
        String plaintext = "Hello, World!";
        String key = "0123456789abcdef"; // 16字节的密钥

        byte[] encrypted = encrypt(plaintext, key);
        System.out.println("加密后的数据：" + new String(encrypted, StandardCharsets.UTF_8));

        String decrypted = decrypt(encrypted, key);
        System.out.println("解密后的数据：" + decrypted);
    }

    public static byte[] encrypt(String plaintext, String key) throws Exception {
        SecretKeySpec secretKey = new SecretKeySpec(key.getBytes(StandardCharsets.UTF_8), "AES");
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, secretKey);
        return cipher.doFinal(plaintext.getBytes(StandardCharsets.UTF_8));
    }

    public static String decrypt(byte[] ciphertext, String key) throws Exception {
        SecretKeySpec secretKey = new SecretKeySpec(key.getBytes(StandardCharsets.UTF_8), "AES");
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, secretKey);
        byte[] decrypted = cipher.doFinal(ciphertext);
        return new String(decrypted, StandardCharsets.UTF_8);
    }
}

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

class AESDecryptionExample
{
    static void Main()
    {
        byte[] ciphertext = Convert.FromBase64String("..."); // 加密后的数据
        string key = "0123456789abcdef"; // 16字节的密钥

        string decrypted = Decrypt(ciphertext, key);
        Console.WriteLine("解密后的数据：" + decrypted);
    }

    static string Decrypt(byte[] ciphertext, string key)
    {
        using (Aes aes = Aes.Create())
        {
            aes.Key = Encoding.UTF8.GetBytes(key);
            aes.Mode = CipherMode.ECB;
            aes.Padding = PaddingMode.PKCS7;

            ICryptoTransform decryptor = aes.CreateDecryptor();
            byte[] decrypted = decryptor.TransformFinalBlock(ciphertext, 0, ciphertext.Length);
            return Encoding.UTF8.GetString(decrypted);
        }
    }
}