package com.dayu.qiheonlinelibrary.net;

import java.nio.charset.StandardCharsets;
import java.security.KeyFactory;
import java.security.PublicKey;
import java.security.spec.X509EncodedKeySpec;

import javax.crypto.Cipher;

/**
 * author: zuo
 * Date: 2024-07-29
 * Time: 14:38
 * 备注：RSA加密工具类
 */
public class RSAUtile {

 public static byte[] encryptByPublicKey(String data, String publicKey) throws Exception {
  // 得到公钥
  X509EncodedKeySpec keySpec = new X509EncodedKeySpec(publicKey.getBytes(StandardCharsets.UTF_8));
  KeyFactory kf = KeyFactory.getInstance("RSA");
  PublicKey keyPublic = kf.generatePublic(keySpec);

  // 加密数据
  Cipher cp = Cipher.getInstance("RSA/ECB/PKCS1Padding");
  cp.init(Cipher.ENCRYPT_MODE, keyPublic);
  return cp.doFinal(data.getBytes(StandardCharsets.UTF_8));
 }



}