如何正确使用CryptoJ对AES256进行加密

import org.cryptomathic.crypto.CryptoMathicProvider;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;

// 添加CryptoJ提供者
CryptoMathicProvider.add();

// 生成AES密钥
KeyGenerator keyGenerator = KeyGenerator.getInstance("AES", "CryptoMathicProvider");
keyGenerator.init(256); // 设置密钥长度为256位
SecretKey secretKey = keyGenerator.generateKey();

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

// 获取AES加密实例
Cipher cipher = Cipher.getInstance("AES", "CryptoMathicProvider");

// 设置加密模式和密钥
cipher.init(Cipher.ENCRYPT_MODE, secretKey);

// 执行加密操作
byte[] encryptedData = cipher.doFinal(plainText.getBytes());

// 获取AES解密实例
Cipher cipher = Cipher.getInstance("AES", "CryptoMathicProvider");

// 设置解密模式和密钥
cipher.init(Cipher.DECRYPT_MODE, secretKey);

// 执行解密操作
byte[] decryptedData = cipher.doFinal(encryptedData);