Rijndael在Java中的支持

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

public class AESExample {
    public static void main(String[] args) throws Exception {
        // 生成一个128位的密钥
        KeyGenerator keyGen = KeyGenerator.getInstance("AES");
        keyGen.init(128);
        SecretKey secretKey = keyGen.generateKey();

        // 创建一个Cipher对象，使用AES加密算法
        Cipher cipher = Cipher.getInstance("AES");

        // 初始化Cipher对象为加密模式
        cipher.init(Cipher.ENCRYPT_MODE, secretKey);

        // 加密数据
        byte[] plaintext = "Hello, world!".getBytes();
        byte[] ciphertext = cipher.doFinal(plaintext);

        // 初始化Cipher对象为解密模式
        cipher.init(Cipher.DECRYPT_MODE, secretKey);

        // 解密数据
        byte[] decrypted = cipher.doFinal(ciphertext);

        // 输出结果
        System.out.println("Plaintext: " + new String(plaintext));
        System.out.println("Ciphertext: " + new String(ciphertext));
        System.out.println("Decrypted: " + new String(decrypted));
    }
}