Java应用服务系统安全性，签名和验签浅析

1 前言

随着互联网的普及，分布式服务部署越来越流行，服务之间通信的安全性也是越来越值得关注。这里，笔者把应用与服务之间通信时，进行的的安全性相关，加签与验签，进行了一个简单的记录。

2 安全性痛点

• 网关服务接口，暴漏在公网，被非法调用？
• 增加了token安全验证，被抓包等其他手段拦截了token，token验证无效？
• 参数被非法获取，非法调用系统应用的接口？
• 接口参数被非法获取后，同一个接口被重复多次非法调用？

3 技术选型

3.1 对称加密与非对称加密对比

• 对称加密

  优点：加密速度快
  缺点：密钥管理分配困难，安全性较低

• 非对称加密

  优点：安全性较高
  缺点：加密速度慢

对称加密技术加密和解密使用的都是同一个密钥，因此密钥的管理非常困难，在分发密钥的过程中，如果一方密钥被截获，那后面的通信就是不安全的。

而非对称加密技术就很好的解决了这一问题，非对称加密技术使用公钥加密，私钥加密。通信前把公钥发布出去，私钥只有自己保留，即便你的公钥被攻击者拿到，没有私钥，就无法进行解密。

那有了非对称加密技术，对称加密是不是就被淘汰了？当然不是，因为非对称加密技术加解密比较慢，不适合对大量数据的加解密。

3.2 MD5是对称加密还是非对称加密？

• 对称算法有哪些？

对称密码算法又叫传统密码算法，也就是加密密钥能够从解密密钥中推算出来，反过来也成立。在大多数对称算法中，加密解密密钥是相同的。常见的对称算法有：DES、IDEA、AES、SM1和SM4。

• 非对称算法有哪些？

非对称密钥也叫公开密钥加密,它是用两个数学相关的密钥对信息进行编码。在此系统中，其中一个密钥叫公开密钥，可随意发给期望同密钥持有者进行安全通信的人。公开密钥用于对信息加密。第二个密钥是私有密钥，属于密钥持有者，此人要仔细保存私有密钥。密钥持有者用私有密钥对收到的信息进行解密。常见的非对称算法有：RSA、ECC、SM2。

这个问题有人吐槽过，面试官竟然问MD5是对称加密还是非对称加密？其实，MD5不是加密算法，md5实际上既不是对称算法，也不是非对称加密算法。它是消息摘要（安全散列）算法。

• 对称加密和非对称加密有哪些优缺点？

  对称加密优点： 速度快，对称性加密通常在消息发送方需要加密大量数据时使用，具有算法公开、计算量小、加密速度快、加密效率高的特点。对称加密算法的优点在于加解密的高速度和使用长密钥时的解密性。

  对称加密的缺点： 密钥的管理和分发非常困难，不够安全。在数据传送前，发送方和接收方必须商定好密钥，并且双方都要保存好密钥，如果一方的密钥被泄露，那么加密信息也就不安全了，安全性得不到保证。

  非对称加密优点：安全性更高，公钥是公开的，秘钥是自己保存的，不需要将私钥给别人。

  非对称加密缺点：加密和解密花费时间长、速度慢，只适合对少量数据进行加密

• MD5优缺点

  MD5的优点：计算速度快，加密速度快，不需要密钥；可以检查文件的完整性，一旦文件被更改，MD5值会改变；防止被篡改，传输中一旦被篡改，计算出的MD5值也会改变；防止看到明文，公司存放密码存放的是MD5值。

  MD5的缺点：作为散列算法，经过证实，仍然会存在两种不同数据会发生碰撞；MD5的安全性。将用户的密码直接MD5后存储在数据库中是不安全的。很多人使用的密码是常见的组合，威胁者将这些密码的常见组合进行单向哈希，得到一个摘要组合，然后与数据库中的摘要进行比对即可获得对应的密码。

综上所述，md5是消息摘要算法，既不是对称算法也不是非对称算法。大部分情况下使用对称加密具有不错的安全性，如果需要分布式进行密钥分发，那么就考虑使用非对称加密；如果不需要可逆计算，则考虑散列算法（md5）。

参考资料：https://www.eolink.com/news/post/28567.html

具体的加密算法可以参考另一篇博文：浅析对称加密与非对称加密算法
经过分析，最终采用AES加密算法对参数进行加密（有需要的话），加签和验签采用RSA非对称加密算法。

4 请求头参数

服务端提供签名私钥 private_key、应用id app_id、商户号 merchant_no，另外，所有请求的接口，都需要添加请求头Headers，8个参数如下：

名称	类型	说明	是否必填
method_name	String	请求的方法名称	是
request_method	String	请求方式（get or post）	是
merchant_no	String	商户号，一个商户可以有多个应用	是
msg_id	String	通讯唯一编号	是
app_id	String	应用系统唯一编号	是
sign_timestamp	String	请求时应用端签名时的时间戳（毫秒单位），接入系统的时间误差不能超过3分钟，示例：1898098042342	是
api_gw_public_key	String	网关公钥key，通过该公钥，才可以请求网关服务	是
request_sign	String	签名信息，用来验签，通过签名机制，防止应用的请求参数被非法篡改，应用系统必须保证相关私钥不被泄露	是

• 请求是head头参数示例：

注：postman自定义参数，在Pre-request Script 输入: pm.environment.set('sign_timestamp',new Date().getTime());

5 签名以及验签机制

• 原理
  请求接口的参数中添加sign签名+时间戳（毫秒单位）
  具体实现原理：应用端生成RSA私钥加密签名串，和当前时间戳跟随请求的参数一起发送到后台，后台获取签名进行RSA公钥解密，然后获取系统当前时间戳和前端发送过来的时间戳做比较，如果两者相差超过180s，则认定为非法操作。这种方式既能保证防止请求重放，又能有效节省服务器资源

  注：应用端调用服务端接口时的公钥，必须为PKCS8格式的RSA 2048密钥，该密钥还必须经过Base64转换，服务端提供的API公钥也遵从同样标准。

• 本文章涉及到的安全机制梳理如下：

  * 原有的token校验，无法做到安全性，因为token一般过期时间都很长，可以token多次访问
  * 原来可以直接简单的http调用，现在必须经过一系列加签过程才可以访问服务资源
  * 加签时timestamp以日为单位，跨日时可能会验签失败，这里可以根据实际业务情况调整
  * api网关秘钥校验，只有有效的key才可以访问网关服务
  * 应用端使用后端分配的私钥（定期修改增加安全性）进行加签，后端进行公钥验签，非对称加解密，增加了更高级别的安全性
  * 服务端分配商户号和应用编号，保证唯一性
  * 应用端加签和服务端验签，`时间戳不允许超过3min（可动态调整）`，保证即使参数被盗，3min过期后仍然无法访问
  * 即使参数被非法获取，也仅仅是那个接口极短时间内有风险，大大提高的系统的防攻击特性
  

5.1 签名

• 系统采取的签名算法
  SHA256WithRSA签名算法，使用RSA非对称加密算法，可以采用应用端 + 服务端双重签名的方式，来保证系统的安全性。

  Unlike symmetric encryption algorithms, asymmetric encryption algorithms require two keys: public key and private key. The public key and private key are a pair. If the data is encrypted with the public key, only the corresponding private key can be decrypted; If the data is encrypted with a private key, it can only be decrypted with the corresponding public key. Because encryption and decryption use two different keys, this algorithm is called asymmetric encryption algorithm

• 签名私钥private_key、应用idapp_id、商户号merchant_no由服务端提供

5.2 加签名思路

• 参数数据是在应用端，使用私钥加密的，这里在服务端只能用相应公钥解密，即可验签是否有效

• 首先将method_name、request_method、merchant_no、msg_id、app_id、sign_timestamp拼接成一个字符串：

  getUserInfo?method_name=getUserInfo&request_method=get&merchant_no=6666XF20230306001&msg_id=666&app_id=10000000006666001&charset=UTF-8&format=json&sign_type=RSA2&timestamp=20230311
  

• 把拼接后的字符串，按照ASCII排序

  getUserInfo?app_id=10000000006666001&charset=UTF-8&format=json&merchant_no=6666XF20230306001&method_name=getUserInfo&msg_id=666&request_method=get&sign_type=RSA2&timestamp=20230311
  

  注：ASCII码的值从⼩到⼤为数字、⼤写英⽂字母、⼩写英⽂字母。48～57为0到9⼗个阿拉伯数字，65～90为26个⼤写英⽂字母，97～122号为26个⼩写英⽂字母。

• 对私钥进行Base64加密

• 对以上字符串进行SHA256WithRSA签名算法，运算之后得到：

  VN2O+0Kgf9SSQf36BhUo6EqvMcKPlRHEm+6TWBqqQxCXmW5a88NYnVafItEBvWBajY8nR+8w9zhpNrCZZ2dHyg0umPZSDi6cDQL/zVX15fwvZlMRnccNHnMJ4QfDuybEN4NGWUDsOWXiEvlAzTA3/QYrRWivXpyrKS9xlA/CqTOvZIdwlcyJEokGHP55aMrJCfJuVdmKI6oqkPMpNvwHe/fQHi0krhkOJw7aa97WJ0tptqdpmnANz/lvCEvFBmvUIMVFtjpEutPTRSAL1miDZeKHdfPlUIMN0G/qoTdSyFF4yh0Nvk0rSvGd0/tVSxDUBE5sLhbjM5K+gLpo2iOQGQ==
  

• 最后，将VsMiLe6字符串，添加到sign开头处，再次增加安全性，最后得到：

  VsMiLe6VN2O+0Kgf9SSQf36BhUo6EqvMcKPlRHEm+6TWBqqQxCXmW5a88NYnVafItEBvWBajY8nR+8w9zhpNrCZZ2dHyg0umPZSDi6cDQL/zVX15fwvZlMRnccNHnMJ4QfDuybEN4NGWUDsOWXiEvlAzTA3/QYrRWivXpyrKS9xlA/CqTOvZIdwlcyJEokGHP55aMrJCfJuVdmKI6oqkPMpNvwHe/fQHi0krhkOJw7aa97WJ0tptqdpmnANz/lvCEvFBmvUIMVFtjpEutPTRSAL1miDZeKHdfPlUIMN0G/qoTdSyFF4yh0Nvk0rSvGd0/tVSxDUBE5sLhbjM5K+gLpo2iOQGQ==
  

5.3 验签思路

使用原有的请求入参，以及传递来的sign进行公钥解密，如果解密成功，就说明验签通过，否则验签失败。

注：如果使用公钥加密，则需要私钥进行解密，是双向的。

6 功能核心代码实现

6.1 SDK核心代码

6.1.1 SmileConstants常量类

/*** icbc.com.cn Inc.* Copyright (c) 2004-2016 All Rights Reserved.*/
package cn.smilehappiness.security.constant;/*** <p>* SmileConstants* <p/>** @author* @Date 2023/3/6 19:30*/
public class SmileConstants {public static final String SIGN_TYPE = "sign_type";public static final String SIGN_TYPE_RSA = "RSA";public static final String SIGN_TYPE_RSA2 = "RSA2";public static final String SIGN_TYPE_SM2 = "SM2";public static final String SIGN_TYPE_CA = "CA";public static final String SIGN_TYPE_SM = "SM";public static final String SIGN_TYPE_EM = "EM";public static final String SIGN_TYPE_EM_SM = "EM-SM";public static final String SIGN_SHA1RSA_ALGORITHMS = "SHA1WithRSA";public static final String SIGN_SHA256RSA_ALGORITHMS = "SHA256WithRSA";public static final String ENCRYPT_TYPE_AES = "AES";public static final String METHOD_NAME = "method_name";public static final String REQUEST_METHOD = "request_method";public static final String MERCHANT_NO = "merchant_no";public static final String APP_ID = "app_id";public static final String SIGN_TIMESTAMP = "sign_timestamp";public static final String API_GW_PUBLIC_KEY = "api_gw_public_key";public static final String REQUEST_SIGN = "request_sign";public static final String FORMAT = "format";public static final String TIMESTAMP = "timestamp";public static final String SIGN = "sign";public static final String APP_AUTH_TOKEN = "app_auth_token";public static final String CHARSET = "charset";public static final String NOTIFY_URL = "notify_url";public static final String RETURN_URL = "return_url";public static final String ENCRYPT_TYPE = "encrypt_type";public static final String BIZ_CONTENT_KEY = "biz_content";/*** Default time format**/public static final String DATE_TIME_FORMAT = "yyyy-MM-dd HH:mm:ss";public static final String YYYY_MM_DD = "yyyyMMdd";/*** Date Default time zone**/public static final String DATE_TIMEZONE = "GMT+8";/*** UTF-8 character set**/public static final String CHARSET_UTF8 = "UTF-8";/*** GBK character set**/public static final String CHARSET_GBK = "GBK";/*** JSON  Format*/public static final String FORMAT_JSON = "json";/*** XML  Format*/public static final String FORMAT_XML = "xml";public static final String CA = "ca";public static final String PASSWORD = "password";public static final String RESPONSE_BIZ_CONTENT = "response_biz_content";/*** Message unique number**/public static final String MSG_ID = "msg_id";/*** sdk The version number in the headerkey*/public static final String VERSION_HEADER_NAME = "APIGW-VERSION";/*** sdk Region number, for overseas institutions*/public static final String ZONE_NO = "Zone-No";/*** Request type*/public static final String REQUEST_Type = "Request-Type";/*** For em-type signatures, send a request to CICC Cryptography*/public static final String EM_CFCA = "CFCA";/*** For em-type signature, send a request to the NC client*/public static final String EM_NC = "NC";/*** Refined information*/public static final String REFINE_INFO = "Apirefined-Info";}

6.1.2 SmileClient类

package cn.smilehappiness.security.api.client;import cn.smilehappiness.security.constant.SmileConstants;
import cn.smilehappiness.security.dto.BaseRequest;
import cn.smilehappiness.security.utils.AesCryptUtil;
import cn.smilehappiness.security.utils.SecurityStringUtil;
import cn.smilehappiness.security.utils.SmileHashMap;
import cn.smilehappiness.security.utils.SmileSignatureUtil;
import com.alibaba.fastjson.JSON;
import org.apache.commons.lang3.ObjectUtils;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.*;/*** <p>* smile client base deal* <p/>** @author* @Date 2023/3/7 11:08*/
public class SmileClient {private static final Logger logger = LoggerFactory.getLogger(SmileClient.class);protected String apiPublicKey;protected String merchantNo;protected String appId;protected String signType = SmileConstants.SIGN_TYPE_RSA;protected String privateKey;protected String publicKey;protected String charset = SmileConstants.CHARSET_UTF8;protected String format = SmileConstants.FORMAT_JSON;protected String encryptType;protected String encryptKey;public SmileClient() {}public SmileClient(String apiPublicKeyParam, String appId, String merchantNo, String signType, String privateKey, String publicKey, String charset, String format, String encryptType, String encryptKey) {this.apiPublicKey = apiPublicKeyParam;this.appId = appId;this.merchantNo = merchantNo;this.signType = signType;this.privateKey = privateKey;this.publicKey = publicKey;this.charset = charset;this.format = format;this.encryptType = encryptType;this.encryptKey = encryptKey;}public SmileClient(String apiPublicKeyParam, String appId, String merchantNo, String privateKey) {this(apiPublicKeyParam, appId, merchantNo, SmileConstants.SIGN_TYPE_RSA, privateKey, null, SmileConstants.CHARSET_UTF8, SmileConstants.FORMAT_JSON, null, null);}/*** <p>* rsa,rsa2，four params* <p/>** @param apiPublicKeyParam* @param appId* @param signType* @param privateKey* @return* @Date 2023/3/7 11:08*/public SmileClient(String apiPublicKeyParam, String appId, String merchantNo, String signType, String privateKey) {this(apiPublicKeyParam, appId, merchantNo, signType, privateKey, null, SmileConstants.CHARSET_UTF8, SmileConstants.FORMAT_JSON, null, null);}/*** <p>* check sign，five params* <p/>** @param apiPublicKeyParam* @param appId* @param signType* @param privateKey* @return* @Date 2023/3/8 15:40*/public SmileClient(String apiPublicKeyParam, String appId, String merchantNo, String signType, String privateKey, String publicKey) {this(apiPublicKeyParam, appId, merchantNo, signType, privateKey, publicKey, SmileConstants.CHARSET_UTF8, SmileConstants.FORMAT_JSON, null, null);}/*** <p>* six params -AES encrypt* <p/>** @param apiPublicKeyParam* @param appId* @param signType* @param privateKey* @param encryptType* @param encryptKey* @return* @Date 2023/3/8 10:19*/public SmileClient(String apiPublicKeyParam, String appId, String merchantNo, String signType, String privateKey, String encryptType, String encryptKey) {this(apiPublicKeyParam, appId, merchantNo, signType, privateKey, null, SmileConstants.CHARSET_UTF8, SmileConstants.FORMAT_JSON, encryptType, encryptKey);}public SmileClient(String apiPublicKeyParam, String appId, String merchantNo, String signType, String privateKey, String publicKey, String encryptType, String encryptKey) {this(apiPublicKeyParam, appId, merchantNo, signType, privateKey, publicKey, SmileConstants.CHARSET_UTF8, SmileConstants.FORMAT_JSON, encryptType, encryptKey);}private boolean checkApiPublicKeyLegal(String apiPublicKeyParam) {if (StringUtils.isBlank(apiPublicKeyParam) || !apiPublicKey.equals(apiPublicKeyParam)) {throw new RuntimeException("apiPublicKey param [" + apiPublicKeyParam + "] is unLegal");}return true;}/*** <p>* prepare params* <p/>** @param request* @return cn.smilehappiness.security.utils.IcbcHashMap* @Date 2023/3/7 13:56*/public SmileHashMap prepareParams(BaseRequest<?> request) {SmileHashMap params = new SmileHashMap();String strToSign = this.prepareParamStr(request, params);logger.info("addSign strToSign: {}", strToSign);if (signType.equals(SmileConstants.SIGN_TYPE_RSA) || signType.equals(SmileConstants.SIGN_TYPE_RSA2)) {String signedStr = SmileSignatureUtil.sign(strToSign, signType, privateKey, charset);params.put(SmileConstants.SIGN, signedStr);} else {// Other signature typeslogger.error("signType {} is not supported", signType);throw new RuntimeException("signType " + signType + " is not supported");}return params;}/*** <p>* prepare param str* <p/>** @param request* @param params* @return java.lang.String* @Date 2023/3/8 16:34*/private String prepareParamStr(BaseRequest<?> request, SmileHashMap params) {Map<String, String> extraParams = request.getExtraParameters();if (extraParams != null) {params.putAll(extraParams);}//appId Is the public variable of the classparams.put(SmileConstants.METHOD_NAME, request.getMethodName());params.put(SmileConstants.REQUEST_METHOD, StringUtils.lowerCase(request.getRequestMethod()));params.put(SmileConstants.MERCHANT_NO, merchantNo);params.put(SmileConstants.APP_ID, appId);params.put(SmileConstants.MSG_ID, request.getMsgId());params.put(SmileConstants.SIGN_TYPE, signType);params.put(SmileConstants.CHARSET, charset);params.put(SmileConstants.FORMAT, format);try {// Get the timestamp, where you can achieve a higher level of control over the time dimensionlong timestamp = System.currentTimeMillis();DateFormat df = new SimpleDateFormat(SmileConstants.YYYY_MM_DD);df.setTimeZone(TimeZone.getTimeZone(SmileConstants.DATE_TIMEZONE));//time error is within 3 minutes, gateway control,this only 1d validityparams.put(SmileConstants.TIMESTAMP, df.format(new Date(timestamp)));} catch (Exception exception) {exception.printStackTrace();}// Core content parameters need to be encryptedString bizContentStr = buildBizContentStr(request);if (request.isEncryptFlag()) {if (SecurityStringUtil.areEmpty(encryptType, encryptKey)) {logger.error("request need be encrypted, encrypt type and encrypt key can not be null");throw new RuntimeException("request need be encrypted, encrypt type and encrypt key can not be null");}if (bizContentStr != null) {params.put(SmileConstants.ENCRYPT_TYPE, encryptType);params.put(SmileConstants.BIZ_CONTENT_KEY, AesCryptUtil.encryptContent(bizContentStr, encryptType, encryptKey, charset));}} else {// Do not encrypt, fill in the requestParam fieldparams.put(SmileConstants.BIZ_CONTENT_KEY, bizContentStr);}// Sort by rulereturn this.buildOrderedSignStr(request.getMethodName(), params);}/*** <p>* build biz content str* <p/>** @param request* @return java.lang.String* @Date 2023/3/7 13:43*/protected String buildBizContentStr(BaseRequest<?> request) {if (ObjectUtils.isEmpty(request.getBizContent())) {return null;}if (this.format.equals(SmileConstants.FORMAT_JSON)) {return JSON.toJSONString(request.getBizContent());} else {logger.error("only support json format, current format is not supported, format: {}", this.format);throw new RuntimeException("only support json format, current format is not supported, format: " + this.format);}}/*** <p>* build ordered sign str* <p/>** @param methodName* @param params* @return java.lang.String* @Date 2023/3/7 11:25*/private String buildOrderedSignStr(String methodName, Map<String, String> params) {Map<String, String> sortedMap = new TreeMap();sortedMap.putAll(params);Set<Map.Entry<String, String>> entries = sortedMap.entrySet();boolean hasParam = false;StringBuilder sb = new StringBuilder(methodName);sb.append("?");Iterator var6 = entries.iterator();while (var6.hasNext()) {Map.Entry<String, String> entry = (Map.Entry) var6.next();String name = entry.getKey();String value = entry.getValue();if (SecurityStringUtil.areNotEmpty(name, value)) {if (hasParam) {sb.append("&");} else {hasParam = true;}sb.append(name).append("=").append(value);}}return sb.toString();}/*** <p>* signCheck* <p/>** @param request* @param signStr* @return T* @Date 2023/3/8 13:29*/public <T> T signCheck(BaseRequest<T> request, String signStr) {if (StringUtils.isBlank(signStr)) {throw new RuntimeException("sign check fail, signStr param is null");}//check api public key legalthis.checkApiPublicKeyLegal(request.getApiGwPublicKey());SmileHashMap params = new SmileHashMap();String strToSign = this.prepareParamStr(request, params);logger.info("signCheck strToSign: {}", strToSign);int indexOfSignStart = SmileSignatureUtil.SIGN_PREFIX.length();String sign = signStr.substring(indexOfSignStart);boolean passed = SmileSignatureUtil.verifySign(strToSign, this.signType, this.publicKey, this.charset, sign);if (!passed) {logger.error("sign verify not passed, please check");throw new RuntimeException("sign verify not passed, please check");}if (!request.isEncryptFlag()) {return null;}// The signature is base64 encoded, and no comma will appearString startKey = StringUtils.join(SmileConstants.BIZ_CONTENT_KEY, "=");int indexOfStart = strToSign.lastIndexOf(startKey);int indexOfEnd = strToSign.lastIndexOf("&charset");String bizContentStr = strToSign.substring(indexOfStart, indexOfEnd).replace(startKey, "");String bizContentDecryptResult = AesCryptUtil.decryptContent(bizContentStr, this.encryptType, this.encryptKey, this.charset);return (T) JSON.parse(bizContentDecryptResult);}}

6.1.3 签名工具类

package cn.smilehappiness.security.utils;import cn.smilehappiness.security.constant.SmileConstants;
import cn.smilehappiness.security.utils.crypt.RSAUtil;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;import java.io.UnsupportedEncodingException;/*** <p>* smile signature util* <p/>** @author* @Date 2023/3/7 14:04*/
public class SmileSignatureUtil {private static final Logger logger = LoggerFactory.getLogger(SmileSignatureUtil.class);public static final String SIGN_PREFIX = "VsMiLe6";private SmileSignatureUtil() {}public static String sign(String content, String signType, String privateKey, String charset) {return sign(content, signType, privateKey, charset, null);}/*** <p>* sign* <p/>** @param content* @param signType* @param privateKey* @param charset* @param password* @return java.lang.String* @Date 2023/3/7 14:15*/public static String sign(String content, String signType, String privateKey, String charset, String password) {try {byte[] contentBytes = content.getBytes(charset);if (signType.equals(SmileConstants.SIGN_TYPE_RSA)) {String signStr = RSAUtil.sign(contentBytes, Base64.decodeBase64(privateKey), SmileConstants.SIGN_SHA1RSA_ALGORITHMS);return StringUtils.join(SIGN_PREFIX, signStr);} else if (signType.equals(SmileConstants.SIGN_TYPE_RSA2)) {String signStr = RSAUtil.sign(contentBytes, Base64.decodeBase64(privateKey), SmileConstants.SIGN_SHA256RSA_ALGORITHMS);return StringUtils.join(SIGN_PREFIX, signStr);}logger.error("not support signType");throw new RuntimeException("not support signType.");} catch (UnsupportedEncodingException e) {logger.error("get content charset exception, content: {} , charset:{} ,error info: {}", content, charset, e);throw new RuntimeException("get content charset exception. content: " + content + " charset: " + charset + e);} catch (Exception e) {logger.error("sign exception.", e);throw new RuntimeException("sign exception." + e);}}/*** <p>* verify sign* <p/>** @param content* @param signType* @param publicKey* @param charset* @param sign* @return boolean* @Date 2023/3/7 14:15*/public static boolean verifySign(String content, String signType, String publicKey, String charset, String sign) {try {byte[] contentBytes = content.getBytes(charset);if (signType.equals(SmileConstants.SIGN_TYPE_RSA)) {return RSAUtil.verify(contentBytes, Base64.decodeBase64(publicKey), sign, SmileConstants.SIGN_SHA1RSA_ALGORITHMS);} else if (signType.equals(SmileConstants.SIGN_TYPE_RSA2)) {return RSAUtil.verify(contentBytes, Base64.decodeBase64(publicKey), sign, SmileConstants.SIGN_SHA256RSA_ALGORITHMS);}logger.error("not support signType.");throw new RuntimeException("not support signType.");} catch (UnsupportedEncodingException e) {logger.error("get content charset exception. content: " + content + " charset: " + charset, e);throw new RuntimeException("get content charset exception. content: " + content + " charset: " + charset + e);} catch (Exception e) {logger.error("sign verify exception.", e);throw new RuntimeException("sign verify exception." + e);}}}

6.2 加签代码示例

	@Testpublic void testAddSign() {BaseRequest<Map<String, Object>> request = new BaseRequest<>();//sign paramrequest.setMethodName("getUserInfo");request.setRequestMethod("get");request.setMerchantNo("6666XF20230306001");request.setAppId("10000000006666001");request.setMsgId("666");request.setSignTimestamp(System.currentTimeMillis());request.setApiGwPublicKey(smileSecurityConfig.getApiGwPublicKey());SmileClient client = new SmileClient(smileSecurityConfig.getApiGwPublicKey(), smileSecurityConfig.getAppId(), smileSecurityConfig.getMerchantNo(), SmileConstants.SIGN_TYPE_RSA2, smileSecurityConfig.getPrivateKey());SmileHashMap smileHashMap = client.prepareParams(request);System.out.println(JSON.toJSONString(smileHashMap));}

6.3 验签代码示例

package com.itn.idn.gateway.security;import cn.smilehappiness.security.api.client.SmileClient;
import cn.smilehappiness.security.config.SmileSecurityConfig;
import cn.smilehappiness.security.constant.SmileConstants;
import cn.smilehappiness.security.dto.BaseRequest;
import com.alibaba.fastjson.JSON;
import com.itn.idn.gateway.ErrorService;
import com.itn.idn.gateway.enums.GatewayExceptionEnum;
import com.itn.idn.gateway.util.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;import java.util.Arrays;
import java.util.Map;/*** <p>* api security interceptor* <p/>** @author* @Date 2023/3/10 17:40*/
@Component
@RefreshScope
@ConfigurationProperties("security.config")
public class ApiSecurityInterceptor implements GlobalFilter, Ordered {private final Logger logger = LoggerFactory.getLogger(ApiSecurityInterceptor.class);private final long ALLOW_INTERVAL_TIMESTAMP = 180000L;@Autowiredprivate ErrorService errorService;@Autowiredprivate SmileSecurityConfig smileSecurityConfig;private String[] skipAuthUrls;public String[] getSkipAuthUrls() {return skipAuthUrls;}public void setSkipAuthUrls(String[] skipAuthUrls) {this.skipAuthUrls = skipAuthUrls;}/*** sign verify filter** @param exchange* @param chain* @return*/@Overridepublic Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {String url = exchange.getRequest().getURI().getPath();// Skip paths that do not require validationif (StringUtils.matches(url, Arrays.asList(skipAuthUrls))) {return chain.filter(exchange);}String methodName = exchange.getRequest().getHeaders().getFirst(SmileConstants.METHOD_NAME);String requestMethod = exchange.getRequest().getHeaders().getFirst(SmileConstants.REQUEST_METHOD);String merchantNo = exchange.getRequest().getHeaders().getFirst(SmileConstants.MERCHANT_NO);String appId = exchange.getRequest().getHeaders().getFirst(SmileConstants.APP_ID);String msgId = exchange.getRequest().getHeaders().getFirst(SmileConstants.MSG_ID);String signTimestamp = exchange.getRequest().getHeaders().getFirst(SmileConstants.SIGN_TIMESTAMP);String apiGwPublicKey = exchange.getRequest().getHeaders().getFirst(SmileConstants.API_GW_PUBLIC_KEY);String requestSign = exchange.getRequest().getHeaders().getFirst(SmileConstants.REQUEST_SIGN);//head need paramsBaseRequest<Map<String, Object>> request = new BaseRequest<>();//sign paramrequest.setMethodName(methodName);request.setRequestMethod(requestMethod);request.setMerchantNo(merchantNo);request.setAppId(appId);request.setMsgId(msgId);ServerHttpResponse resp = exchange.getResponse();if (StringUtils.isBlank(signTimestamp)) {logger.error("signTimestamp params is null");return errorService.authError(resp, GatewayExceptionEnum.SIGN_CHECK_FAIL);}request.setSignTimestamp(Long.parseLong(signTimestamp));long intervalTimestamp = System.currentTimeMillis() - request.getSignTimestamp();logger.info("request url:{}，sign and request interval timestamp:{}", url, intervalTimestamp);if (Math.abs(intervalTimestamp) > ALLOW_INTERVAL_TIMESTAMP) {logger.error("intervalTimestamp {} is greater than 3min", intervalTimestamp);return errorService.authError(resp, GatewayExceptionEnum.SIGN_CHECK_FAIL);}request.setApiGwPublicKey(apiGwPublicKey);logger.info("filter sign check params:{}", JSON.toJSONString(request));SmileClient client = new SmileClient(request.getApiGwPublicKey(), request.getAppId(), request.getMerchantNo(), SmileConstants.SIGN_TYPE_RSA2, null, smileSecurityConfig.getPublicKey());try {//signCheck strToSign: getUserInfo?app_id=10000000006666001&charset=UTF-8&format=json&merchant_no=6666XF20230306001&method_name=getUserInfo&msg_id=666&request_method=get&sign_type=RSA2&timestamp=20230311client.signCheck(request, requestSign);} catch (RuntimeException exception) {return errorService.authError(resp, GatewayExceptionEnum.SIGN_CHECK_FAIL);}return chain.filter(exchange);}@Overridepublic int getOrder() {return -100;}}

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