spark udf内部的加密解密，使用JKS文件

keytool -genkeypair -alias mykey -keyalg RSA -keystore mykeystore.jks

import javax.crypto.Cipher;
import java.security.Key;
import java.security.KeyStore;
import java.security.PrivateKey;

// 加载JKS文件
KeyStore keystore = KeyStore.getInstance("JKS");
keystore.load(new FileInputStream("mykeystore.jks"), "password".toCharArray());

// 获取私钥
PrivateKey privateKey = (PrivateKey) keystore.getKey("mykey", "password".toCharArray());

// 创建加密算法实例
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, privateKey);

// 加密数据
byte[] encryptedData = cipher.doFinal(data);

import javax.crypto.Cipher;
import java.security.Key;
import java.security.KeyStore;
import java.security.PublicKey;

// 加载JKS文件
KeyStore keystore = KeyStore.getInstance("JKS");
keystore.load(new FileInputStream("mykeystore.jks"), "password".toCharArray());

// 获取公钥
PublicKey publicKey = keystore.getCertificate("mykey").getPublicKey();

// 创建解密算法实例
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.DECRYPT_MODE, publicKey);

// 解密数据
byte[] decryptedData = cipher.doFinal(encryptedData);