1、方案1（jsencrypt加密 java解密 ）
首先要了解到rsa加密后的byte数组类型需要base64加密才能变成String类型；解密的时候也是需要经过base64处理。同理，js这边rsa加密也是一样的，但是使用jsencrypt.js库人就不需要了，因为库里面会自动用base64处理。其次使用rsa处理的明文不能超过公钥的长度，公钥达到1024就属于安全了，如果用2048会是解密的时间变长，所以就用1024。但是这样就需要把所传的参数分段处理，注意使用slice （js）方法。最后就是上代码了。
//尽量长yidia
var sRequestData = "在这样雨雪交加的日子里，如果没有什么紧要事，人们宁愿一整天足不出户。因此，县城的大街小巷倒也比平时少了许多嘈杂。";
$(function () {
$("#one").on("click", function() {
$.post("http://192.168.102.136:8080/mxpp-web/servlet/user/getTokenServlet",{},function(result){
token = result.token;
console.log(token);
});
});
$("#two").on("click", function() {
var encrypt = new JSEncrypt();
encrypt.setPublicKey(token);
var arr=Array();
var arr1=Array();
var str = "";
var byteData = str2UTF8(sRequestData);
if(byteData.length > 128) {
var arr=Array();
var arr1=Array();
for(var i=0;i<sRequestData.length;i+=37){ //约定好的用37就算中文也不会超过长度
arr.push(sRequestData.slice(i,i+37)); //slice比substring更好
}
console.log(arr);
for(var i in arr){
arr1.push(encrypt.encrypt(arr[i]));
console.log(arr[i]);
}
str=arr1.join(',');
} else {
str = encrypt.encrypt(sRequestData);
}
$.post("http://192.168.102.136:8080/mxpp-web/servlet/user/test",{jsonStr:str, token:token},function(result){
debugger;
token = result.token;
});
});
});
function str2UTF8(str){
var bytes = new Array();
var len,c;
len = str.length;
for(var i = 0; i < len; i++){
c = str.charCodeAt(i);
if(c >= 0x010000 && c <= 0x10FFFF){
bytes.push(((c >> 18) & 0x07) | 0xF0);
bytes.push(((c >> 12) & 0x3F) | 0x80);
bytes.push(((c >> 6) & 0x3F) | 0x80);
bytes.push((c & 0x3F) | 0x80);
}else if(c >= 0x000800 && c <= 0x00FFFF){
bytes.push(((c >> 12) & 0x0F) | 0xE0);
bytes.push(((c >> 6) & 0x3F) | 0x80);
bytes.push((c & 0x3F) | 0x80);
}else if(c >= 0x000080 && c <= 0x0007FF){
bytes.push(((c >> 6) & 0x1F) | 0xC0);
bytes.push((c & 0x3F) | 0x80);
}else{
bytes.push(c & 0xFF);
}
}
return bytes;
}
</script>
</html>import java.io.ByteArrayOutputStream;
import java.math.BigInteger;
import java.security.Key;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.Provider;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.RSAPublicKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.Map;
import javax.crypto.Cipher;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
/**
* rsa加密
* 此类主要针对于jsencrypt.js给明文加密，server端java解密
* @author liangjiawei
*
*/
@SuppressWarnings("restriction")
public class RSAUtil {
public static final Provider provider = new BouncyCastleProvider();
private static final String PUBLIC_KEY = "RSAPublicKey";
private static final String PRIVATE_KEY = "RSAPrivateKey";
private static final String charSet = "UTF-8";
public static final String KEY_ALGORITHM = "RSA";
// 种子,改变后,生成的密钥对会发生变化
//private static final String seedKey = "seedKey";
/**
* RSA最大加密明文大小
*/
private static final int MAX_ENCRYPT_BLOCK = 117;
/**
* RSA最大解密密文大小
*/
private static final int MAX_DECRYPT_BLOCK = 128;
/**
* 生成密钥对(公钥和私钥)
* @return
* @throws Exception
*/
public static synchronized Map<String, Object> generateKeyPair() throws Exception {
KeyPairGenerator kpg = KeyPairGenerator.getInstance(KEY_ALGORITHM, provider);
kpg.initialize(1024, new SecureRandom());//seedKey.getBytes()
KeyPair keyPair = kpg.generateKeyPair();
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
Map<String, Object> keyMap = new HashMap<String, Object>(2);
keyMap.put(PUBLIC_KEY, publicKey);
keyMap.put(PRIVATE_KEY, privateKey);
return keyMap;
}
public static PublicKey getPublicRSAKey(String modulus, String exponent)
throws Exception {
RSAPublicKeySpec spec = new RSAPublicKeySpec(
new BigInteger(modulus, 16), new BigInteger(exponent, 16));
KeyFactory kf = KeyFactory.getInstance(KEY_ALGORITHM, provider);
return kf.generatePublic(spec);
}
/**
* 获取公钥
* @param key base64加密后的公钥
* @return
* @throws Exception
*/
public static PublicKey getPublicRSAKey(String key) throws Exception {
X509EncodedKeySpec x509 = new X509EncodedKeySpec(decryptBase64(key));
KeyFactory kf = KeyFactory.getInstance(KEY_ALGORITHM, provider);
return kf.generatePublic(x509);
}
/**
* 获取私钥
* @param key base64加密后的私钥
* @return
* @throws Exception
*/
public static PrivateKey getPrivateRSAKey(String key) throws Exception {
PKCS8EncodedKeySpec pkgs8 = new PKCS8EncodedKeySpec(decryptBase64(key));
KeyFactory kf = KeyFactory.getInstance(KEY_ALGORITHM, provider);
return kf.generatePrivate(pkgs8);
}
/**
* 加密
* @param input 明文
* @param publicKey 公钥
* @return
* @throws Exception
*/
public static byte[] encrypt(String input, PublicKey publicKey)
throws Exception {
Cipher cipher = Cipher.getInstance("RSA/None/PKCS1Padding", provider);
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
byte[] re = cipher.doFinal(input.getBytes(charSet));
return re;
}
/**
* 解密
* @param encrypted
* @param privateKey
* @return
* @throws Exception
*/
public static byte[] decrypt(byte[] encrypted, PrivateKey privateKey)
throws Exception {
Cipher cipher = Cipher.getInstance("RSA/None/PKCS1Padding", provider);
cipher.init(Cipher.DECRYPT_MODE, privateKey);
byte[] re = cipher.doFinal(encrypted);
return re;
}
/**
* base64加密
* @param key
* @return
* @throws Exception
*/
public static byte[] decryptBase64(String key) throws Exception {
return (new BASE64Decoder()).decodeBuffer(key);
}
/**
* base64解密
* @param key
* @return
* @throws Exception
*/
public static String encryptBase64(byte[] key) throws Exception {
return (new BASE64Encoder()).encodeBuffer(key);
}
public static String getPrivateKey(Map<String, Object> keyMap)
throws Exception {
Key key = (Key) keyMap.get(PRIVATE_KEY);
return encryptBase64(key.getEncoded());
}
public static String getPublicKey(Map<String, Object> keyMap)
throws Exception {
Key key = (Key) keyMap.get(PUBLIC_KEY);
return encryptBase64(key.getEncoded());
}
/**
* 分段解密
* @param jsonEncryptStr 密文 格式 base64(rsa(明文)),base64(rsa(明文)),base64(rsa(明文))
* @param privateKey base64加密后的秘钥
* @return
* @throws Exception
*/
public static String segmentdecrypt(String jsonEncryptStr, String privateKey) throws Exception {
String jsonStr = "";
String[] str = jsonEncryptStr.split(",");
if(str !=null && str.length > 0) {
int inputLen = str.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] cache;
int i = 0;
// 对数据分段解密
while (inputLen - 1 >= 0) {
byte[] bt = RSAUtil.decryptBase64(str[i]);
cache = RSAUtil.decrypt(bt, RSAUtil.getPrivateRSAKey(privateKey));
out.write(cache, 0, cache.length);
i++;
inputLen--;
}
byte[] decryptedData = out.toByteArray();
out.close();
jsonStr = new String(decryptedData);
}
return jsonStr;
}
}//生成公钥私钥
try {
Map<String, Object> map = RSAUtil.generateKeyPair();
String publicKey = RSAUtil.getPublicKey(map);
String privateKey = RSAUtil.getPrivateKey(map);
ICacheClient client = WebContextHolder.getCacheClient();
client.set(publicKey, privateKey);
comRes.setRetCode(GetTokenRes.OPT_RESULT_SUCCESS);
comRes.setToken(publicKey);
} catch (Exception e) {
log.error(DataTypeConstant.MOD_CODE_SUBTYPE16, "getTokenServlet", "用户生成公钥接口异常.", e);
comRes.setErrMsg("用户TOKEN生成失败！");
}
String jsonResult = JSON.toJSONString(comRes, SerializerFeature.WriteMapNullValue,
SerializerFeature.WriteNullStringAsEmpty, SerializerFeature.WriteNullNumberAsZero);
return writeAjaxResponse(jsonResult);ICacheClient client = WebContextHolder.getCacheClient();
String privateKey = client.get(token);
jsonStr = RSAUtil.segmentdecrypt(jsonEncryptStr, privateKey);有用回复：
1、我在使用的时候中文参数解码后会出现乱码问题，在RSAUtil中改成 jsonStr = new String(decryptedData,"utf-8")就可以了
2、要注意一点js的rsa和java 生产的rsa不一定对接的上
2、方案2（node-forge加密 java解密）
前端（JavaScript/TypeScript）加密实践
前端进行RSA加密的第三方库采用 node-forge 库
import * as forge from 'node-forge';
// publicKey需要先通过http从后台获取，后台可以写一些geKey接口供前端调用
const pki = forge.pki;
// 规定格式：publicKey之前需要加'-----BEGIN PUBLIC KEY-----\n'，之后需要加'\n-----END PUBLIC KEY-----'
const publicK = pki.publicKeyFromPem('-----BEGIN PUBLIC KEY-----\n' + publicKey + '\n-----END PUBLIC KEY-----');
// forge通过公钥加密后一般会是乱码格式，可进行base64编码操作再进行传输，相应的，后台获取到密文的密码后需要先进行base64解码操作再进行解密
const passwordCrypto = forge.util.encode64(publicK.encrypt(password));
// ... 后面就是进行常规的发送登录请求，不同的是，也需要将publicKey作为一个参数传输到后台，后台需要以此找到对应的私钥后端（Java）解密实践
网上后端解密的代码很多，但质量无法确保，正好我使用的 Hutool 这个Java的工具库，其中包含了非对称加密的工具，可以直接使用
/**
* 获取秘钥-RSA
* @return
*/
@RequestMapping(value = "/getKey",method = RequestMethod.POST)
@ResponseBody
public Result<String> getKeyOfRSA() {
Result<String> result = new Result<>();
RSA rsa = new RSA();
String privateKeyBase64 = rsa.getPrivateKeyBase64();
String publicKeyBase64 = rsa.getPublicKeyBase64();
// 使用当前用户的session进行保存公钥私钥对
Subject currentUser = SecurityUtils.getSubject();
Session session = currentUser.getSession();
session.setAttribute(publicKeyBase64, privateKeyBase64);
return result.successWithData(publicKeyBase64);
}
/**
* 解密password
* @param password
* @param publicKey
* @return
* @throws Exception
*/
private String checkPassword(String password, String publicKey, String algorithm) throws Exception {
Subject currentUser = SecurityUtils.getSubject();
Session session = currentUser.getSession();
// publicKey需要前端返回
String privateKey = (String) session.getAttribute(publicKey);
if(privateKey ==null){
log.error("session中私钥失效.publickey={},password={}",publicKey,password);
return null;
}
// 获取到私钥之后，需要将session中的该公钥私钥对信息移除
session.removeAttribute(publicKey);
// 构建，当只用私钥进行构造对象时，只允许使用该私钥进行加密和解密操作，本文只需要进行私钥解密，故只使用私钥构造对象
RSA rsa = new RSA(privateKey, null);
// 密码的密文先进行base64解码，之后再进行解密
byte[] decrypt = rsa.decrypt(Base64.decode(password), KeyType.PrivateKey);
String decryptStr = StrUtil.str(decrypt, CharsetUtil.CHARSET_UTF_8);
return decryptStr;
}
本文章为转载内容，我们尊重原作者对文章享有的著作权。如有内容错误或侵权问题，欢迎原作者联系我们进行内容更正或删除文章。
