RSA非对称加密解密，前端公钥加密后端私钥解密，可以防止陌生人直接通过后端接口篡改数据。有数据泄露的风险。

前端：Vue框架
后端：sprintboot（Java）
工具类：hutool

前端Vue获取公钥：
这里安装jsencrypt这个库进行RSA的加密

npm i jsencrypt  --force

通过后端接口getJSEncryptPublic获取公钥之后，直接套函数加密

/*** 前端vue公钥加密，后段私钥解密* @return*/@GetMapping("/getJSEncryptPublic")public String getJSEncryptPublic(){String str = (String)stringRedisTemplate.opsForValue().get("privateKey");if (StringUtils.isNotBlank(str)){stringRedisTemplate.delete("privateKey");}Map<String, String> mapKeyPair = getMapKeyPair();this.privateKey = mapKeyPair.get("privateKey");stringRedisTemplate.opsForValue().set("privateKey",this.privateKey,15, TimeUnit.MINUTES);this.publicKey = mapKeyPair.get("publicKey");return this.publicKey;}

    /*** 获取私钥，公钥* @return*/public static Map<String,String> getMapKeyPair() {
//        String privateKey = bytesToBase64(getRsaKey().getPrivate().getEncoded());
//        String publicKey = bytesToBase64(getRsaKey().getPublic().getEncoded());// 生成对象，包含钥匙一对RSA rsa = new RSA();// 提取公钥并转成base64编码String publicKeyBase64 = rsa.getPublicKeyBase64();// 提取私钥并转成base64编码String privateKeyBase64 = rsa.getPrivateKeyBase64();Map<String,String> map = new HashMap<>();//privateKey 私钥map.put("privateKey",privateKeyBase64);//publicKey 公钥map.put("publicKey",publicKeyBase64);return map;}

import JSEncrypt from 'jsencrypt/bin/jsencrypt';axios.get('http://localhost:8887/jing/Xqy/user/getJSEncryptPublic').then(reponse =>{console.log("加密加密:",reponse.data);const publicKey = reponse.data // 提取公钥// 获取密码对象const encryptor = new JSEncrypt()// 放入公钥encryptor.setPublicKey(publicKey) // 放入加密的内容，并加密this.passByPublicKey = encryptor.encrypt(this.ruleFormLogin.pass)  // 加密后的密文console.log("passByPublicKey:"+this.passByPublicKey)  //调用queryzhuce()传密文

之后在以密文的形式传给后端（这里调用登录接口queryzhuce()方法），然后后端利用私钥解密获取到真正的明文。

后端获取密文并解密：
如下此时pass是加密后的密文

@GetMapping("/queryZhuce")public List<CaiwuUser> queryZhuce(@RequestParam(name = "username",required = false)String username,@RequestParam(name = "pass",required = false)String pass,HttpServletRequest request){//解密String decyptByRSAPass = getDecyptByRSA(pass, this.privateKey, this.publicKey);System.out.println("decyptByRSAPass:"+decyptByRSAPass);return xqyService.queryZhuce(username,decyptByRSAPass,request);}

/*** 私钥解密* @param rsaPass* @param privateKey* @return*/public static String getDecyptByRSA(String rsaPass,String privateKey,String publicKeyStr){RSA rsa = new RSA(privateKey, null);String s = rsa.decryptStr(rsaPass, KeyType.PrivateKey, CharsetUtil.CHARSET_UTF_8);//String s = new String(decrypt, CharsetUtil.CHARSET_UTF_8);return s;}

RSA非对称加密公共类

RSAUtil类：

import cn.hutool.core.util.CharsetUtil;
import cn.hutool.core.util.StrUtil;
import cn.hutool.crypto.SecureUtil;
import cn.hutool.crypto.asymmetric.KeyType;
import cn.hutool.crypto.asymmetric.RSA;
import cn.hutool.crypto.asymmetric.Sign;
import cn.hutool.crypto.asymmetric.SignAlgorithm;
import com.alibaba.fastjson.JSON;
import com.richfit.richfit.dto.AllDataDto;import java.nio.charset.StandardCharsets;
import java.security.KeyPair;
import java.security.PrivateKey;
import java.util.Base64;
import java.util.HashMap;
import java.util.Map;/*** RSA加密解密验签*/
public class RSAUtil {/*** 获取私钥，公钥* @return*/public static Map<String,String> getMapKeyPair() {
//        String privateKey = bytesToBase64(getRsaKey().getPrivate().getEncoded());
//        String publicKey = bytesToBase64(getRsaKey().getPublic().getEncoded());// 生成对象，包含钥匙一对RSA rsa = new RSA();// 提取公钥并转成base64编码String publicKeyBase64 = rsa.getPublicKeyBase64();// 提取私钥并转成base64编码String privateKeyBase64 = rsa.getPrivateKeyBase64();Map<String,String> map = new HashMap<>();map.put("privateKey",privateKeyBase64);map.put("publicKey",publicKeyBase64);return map;}public static void main(String[] args) {Map<String, String> mapKeyPair = getMapKeyPair();AllDataDto allDataDto = new AllDataDto(null,mapKeyPair.get("privateKey"),mapKeyPair.get("publicKey"),null);System.out.println(JSON.toJSONString(allDataDto));}/*** 私钥解密* @param rsaPass* @param privateKey* @return*/public static String getDecyptByRSA(String rsaPass,String privateKey,String publicKeyStr){RSA rsa = new RSA(privateKey, null);String s = rsa.decryptStr(rsaPass, KeyType.PrivateKey, CharsetUtil.CHARSET_UTF_8);//String s = new String(decrypt, CharsetUtil.CHARSET_UTF_8);return s;}/*** 生成私钥和公钥* @return*/public static KeyPair getRsaKey(){//生成RSA私钥KeyPair pair = SecureUtil.generateKeyPair("RSA");return pair;}/*** 生成私钥* @return*/public static String getRsaPrivateKey(){//生成RSA私钥KeyPair pair = SecureUtil.generateKeyPair("RSA");PrivateKey privateKey = pair.getPrivate();return bytesToBase64(privateKey.getEncoded());}/*** 生成公钥* @return*/public static String getRsaPublicKey(){//生成RSA私钥KeyPair pair = SecureUtil.generateKeyPair("RSA");PrivateKey privateKey = pair.getPrivate();return bytesToBase64(privateKey.getEncoded());}/*** 根据入参生成公钥，私钥，验签* @param text* @return*/public static AllDataDto getAllRsaObject(String text){if (StrUtil.isBlank(text)){throw new RuntimeException("参数不能为空!");}text = text.trim();Map<String,String> map = getMapKeyPair();Sign sign = SecureUtil.sign(SignAlgorithm.SHA256withRSA, map.get("privateKey"), map.get("publicKey"));//签名byte[] data = text.getBytes(StandardCharsets.UTF_8);byte[] signed = sign.sign(data);String signedStr = bytesToBase64(signed);System.out.println("签名：" + signedStr);//验证签名boolean verify = sign.verify(data, base64ToBytes(signedStr));System.out.println("验签：" + verify);AllDataDto allDataDto = new AllDataDto(signedStr, map.get("privateKey"), map.get("publicKey"), text);System.out.println("allDataDto：" + JSON.toJSON(allDataDto));return allDataDto;}//    public static void main(String[] args) {
//        Map<String, String> map = getMapKeyPair();
//        String sign = getSign("123",map.get("privateKey"),map.get("publicKey"));
//        System.out.println("签名:"+sign);
//    }//    public static void main(String[] args) {
//        String text = "人最宝贵的是生命.生命对每个人只有一次.人的一生应当这样度过：当他回首往事的时候,不会因为虚度年华而悔恨,也不会因为碌碌无为而羞耻.这样,在临死的时候,他能够说：“我已把自己的整个的生命和全部的精力献给了世界上最壮丽的事业---------为人类的解放而斗争.”";
//        System.out.println("原文：" + text);
//
//        //生成公私钥对
//        KeyPair pair = SecureUtil.generateKeyPair("RSA");
//        PrivateKey privateKey = pair.getPrivate();
//        PublicKey publicKey = pair.getPublic();
//        //获得私钥
//        String privateKeyStr = bytesToBase64(privateKey.getEncoded());
//        System.out.println("私钥：" + privateKeyStr);
//        //获得公钥
//        String publicKeyStr = bytesToBase64(publicKey.getEncoded());
//        System.out.println("公钥：" + publicKeyStr);
//
//        RSA rsa = new RSA(privateKeyStr, publicKeyStr);
//        System.out.println(rsa);
//
//        //公钥加密，私钥解密
//        byte[] encrypt = rsa.encrypt(StrUtil.bytes(text, CharsetUtil.CHARSET_UTF_8), KeyType.PublicKey);
//        System.out.println("公钥加密：" + bytesToBase64(encrypt));
//
//        byte[] decrypt = rsa.decrypt(encrypt, KeyType.PrivateKey);
//        System.out.println("私钥解密：" + new String(decrypt,StandardCharsets.UTF_8));
////私钥加密，公钥解密byte[] encrypt2 = rsa.encrypt(StrUtil.bytes(text, CharsetUtil.CHARSET_UTF_8), KeyType.PrivateKey);System.out.println("私钥加密：" + bytesToBase64(encrypt2));byte[] decrypt2 = rsa.decrypt(encrypt2, KeyType.PublicKey);System.out.println("公钥解密：" + bytesToBase64(decrypt2));
//
//        Sign sign = SecureUtil.sign(SignAlgorithm.SHA256withRSA, privateKeyStr, publicKeyStr);
//        //签名
//        byte[] data = text.getBytes(StandardCharsets.UTF_8);
//        byte[] signed = sign.sign(data);
//        String signedStr = bytesToBase64(signed);
//        System.out.println("签名：" + signedStr);
//
//        //验证签名
//        boolean verify = sign.verify(data, base64ToBytes(signedStr));
//        System.out.println("验签：" + verify);
//
//    }/*** 验证签名* @param text 入参* @param signedStr 签名* @param privateKeyStr 私钥* @param publicKeyStr 公钥* @return 签名是否合法*/public static Boolean verifySign(String text,String signedStr,String privateKeyStr,String publicKeyStr){Sign sign = SecureUtil.sign(SignAlgorithm.SHA256withRSA, privateKeyStr, publicKeyStr);//验证签名boolean verify = sign.verify(text.getBytes(StandardCharsets.UTF_8), base64ToBytes(signedStr));System.out.println("验签：" + verify);return verify;}/*** 字节数组转Base64编码** @param bytes 字节数组* @return Base64编码*/private static String bytesToBase64(byte[] bytes) {byte[] encodedBytes = Base64.getEncoder().encode(bytes);return new String(encodedBytes, StandardCharsets.UTF_8);}/*** Base64编码转字节数组** @param base64Str Base64编码* @return 字节数组*/private static byte[] base64ToBytes(String base64Str) {byte[] bytes = base64Str.getBytes(StandardCharsets.UTF_8);return Base64.getDecoder().decode(bytes);}
}