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业务来源：

       最近工作中，领导要求给别的项目组的小伙伴提供几个接口，要求对接口的参数进行解密操作，然后对返回的数据进行加密操作。

       这时我想到了AES  

       AES 是对称加密算法，优点：加密速度快；缺点：如果秘钥丢失，就容易解密密文，安全性相对比较差。

代码案例：

请求参数格式：

{"appId": "queryLectureListByPage","data": "eIVh49T2zKQrtcrhVi6BXcXljN4XFlZc9csQiyayIE1eYeIatVNc9gOTL6HHYj29arBEV3TXMVnQxGIR2EHMfICQz+Aq5ldGk0ys13Rgiqk="
}

响应的参数格式：

{"code": 200,"message": "ok","data": "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"
}

生成密钥：

package com.ly.cloud.util;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.SecretKeySpec;
import com.alibaba.druid.util.Base64;
import org.apache.commons.codec.binary.Hex;public class AESUtils {private static final String AES = "AES";private static final String UTF8 = "UTF-8";private static final String CIPHERALGORITHM = "AES/ECB/PKCS5Padding";private static final String Key = "9!#95hsup*&$1zq7";public static void main(String[] args) throws IOException {// wqkjejqwkejqwk  可随便输入字符串，生成对应的密钥String wqkjejqwkejqwk = encrypts("wqkjejqwkejqwk");System.out.println(wqkjejqwkejqwk);}/*** 生成base 64 作为AES加密后的密钥*/public static  String encrypts(String content) {try {byte[] encodeFormat = Key.getBytes();SecretKeySpec key = new SecretKeySpec(encodeFormat, AES);// Cipher对象实际完成加密操作Cipher cipher = Cipher.getInstance(CIPHERALGORITHM);// 加密内容进行编码byte[] byteContent = content.getBytes(UTF8);// 用密匙初始化Cipher对象cipher.init(Cipher.ENCRYPT_MODE, key);// 正式执行加密操作byte[] result = cipher.doFinal(byteContent);return Hex.encodeHexString(result);} catch (Exception e) {e.printStackTrace();return null;}}}

思路：

通过传入的appId然后去数据库中查询到对应的 唯一密钥。然后根据唯一密钥进行解析密文。然后转成将密文转成 我们需要的参数对象。

核心代码：

AES加密解密工具类：

package com.ly.cloud.util;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.SecretKeySpec;
import com.alibaba.druid.util.Base64;
import org.apache.commons.codec.binary.Hex;public class AESUtils {private static final String AES = "AES";private static final String UTF8 = "UTF-8";private static final String CIPHERALGORITHM = "AES/ECB/PKCS5Padding";private static final String Key = "9!#95hsup*&$1zq7";/*** AES加密+Base64转码* * @param data 明文（16进制）* @param key  密钥* @return*/public static String encrypt(String data, String key) {byte[] keyb = null;keyb = Base64.base64ToByteArray(key);SecretKeySpec sKeySpec = new SecretKeySpec(keyb, "AES");Cipher cipher = null;try {cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");} catch (NoSuchAlgorithmException | NoSuchPaddingException e) {e.printStackTrace();}try {cipher.init(Cipher.ENCRYPT_MODE, sKeySpec);} catch (InvalidKeyException e) {e.printStackTrace();}byte[] bjiamihou = null;String miwen = "";try {bjiamihou = cipher.doFinal(data.getBytes("utf-8"));// byte加密后miwen = Base64.byteArrayToBase64(bjiamihou);// 密文用base64加密} catch (IllegalBlockSizeException | BadPaddingException e) {e.printStackTrace();} catch (UnsupportedEncodingException e) {e.printStackTrace();}return miwen;}/*** Base64解码 + AES解码* * @param data 密文 （16进制）* @param key  密钥* @return*/public static String decrypt(String data, String key){byte[] keyb = null;keyb = Base64.base64ToByteArray(key);byte[] miwen = Base64.base64ToByteArray(data);SecretKeySpec sKeySpec = new SecretKeySpec(keyb, "AES");Cipher cipher = null;try {cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");} catch (NoSuchAlgorithmException | NoSuchPaddingException e) {e.printStackTrace();}try {cipher.init(Cipher.DECRYPT_MODE, sKeySpec);} catch (InvalidKeyException e) {e.printStackTrace();}byte[] bjiemihou = null;String mingwen = "";try {bjiemihou = cipher.doFinal(miwen);// byte加密后mingwen = new String(bjiemihou,"utf-8");} catch (IllegalBlockSizeException | BadPaddingException e) {e.printStackTrace();} catch (UnsupportedEncodingException e) {e.printStackTrace();}return mingwen;}public static void main(String[] args) throws IOException {String name = "{\"userId\":\"179135\",\"keyword\":\"讲座副标题\",\"pageNum\":\"1\",\"pageSize\":\"10\"}";
//		String encrypt = encrypt(name, "qVkn2qNkkyAAF8PjQL/7GQ==");
//		String name = "{\"userId\":\"179135\",\"pageNum\":\"1\",\"pageSize\":\"20\"}";//		String name1 = "{\"userId\":\"179135\",\"organizerId\":\"02020\"}";String name1 = "{\"pageNum\":\"1\",\"pageSize\":\"20\"}";String encrypt = encrypt(name, "8c5e186c9de8e9a628234522a794f45b0f");System.out.println(encrypt);System.out.println("---------");System.out.println(decrypt(encrypt,"8c5e186c9de8e9a628234522a794f45b0f"));String wqkjejqwkejqwk = encrypts("wqkjejqwkererjqwk");System.out.println(wqkjejqwkererjqwk);}/*** 生成base 64 作为AES加密后的密钥*/public static  String encrypts(String content) {try {byte[] encodeFormat = Key.getBytes();SecretKeySpec key = new SecretKeySpec(encodeFormat, AES);// Cipher对象实际完成加密操作Cipher cipher = Cipher.getInstance(CIPHERALGORITHM);// 加密内容进行编码byte[] byteContent = content.getBytes(UTF8);// 用密匙初始化Cipher对象cipher.init(Cipher.ENCRYPT_MODE, key);// 正式执行加密操作byte[] result = cipher.doFinal(byteContent);return Hex.encodeHexString(result);} catch (Exception e) {e.printStackTrace();return null;}}// 加密 public static String dataToAES(String password,String data){String hexStr = encrypt(data, password);return hexStr;}// 解密public static String AESToData(String password, String data){return decrypt(data, password);}}

业务层核心代码： 

    @Overridepublic String organizerList(LectureEncryptDto encrypt) throws InvocationTargetException, NoSuchMethodException, IllegalAccessException {//获取appid 对应的key值String key = checkParam(encrypt);// 解密参数  根据传入不同的 对象返回不同的对象MySubscribeDto subscribe = returnObject(MySubscribeDto.class, key, encrypt);//校验解密后参数是否为空checkPageParam(subscribe, "2");Page<MySubscribe> page = new Page<>(subscribe.getPageNum(), subscribe.getPageSize());PageDto<MySubscribe> pageDto = new PageDto<>();IPage<MySubscribe> pageData = lectureMapper.organizerList(page, subscribe.getUserId());pageDto.setTotal(pageData.getTotal());pageDto.setPages(pageData.getPages());pageDto.setPageSize(subscribe.getPageSize());pageDto.setPageNum(subscribe.getPageNum());pageDto.setList(pageData.getRecords());//加密String json = JSONUtil.toJsonStr(pageDto);return AESUtils.dataToAES(key, json);}/*** 根据传入的不同的对象，将他进行解密。然后返回*/public static <T> T returnObject(Class<T> clazz, String key, LectureEncryptDto dto) {Gson gson = new Gson();String decryptedData = AESUtils.AESToData(key, dto.getData());if (StrUtil.isEmpty(decryptedData)) {throw new BusinessException("appId生成的data密钥有误");}return gson.fromJson(decryptedData, clazz);}/*** 检查appID 是否有效*/public String checkParam(LectureEncryptDto dto) {// 根据他传的appid 去数据库里取出appid 对应的 key值，String key = lectureMapper.getAppIdKey(dto.getAppId());if (StrUtil.isEmpty(key)) {throw new BusinessException("appId有误，请重新输入");}return key;}/*** 检查分页-以及其它所需参数是否为空*/public static void checkPageParam(Object objects, String key) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {Class<?> clazz = objects.getClass();Method getPageSizeMethod = clazz.getMethod("getPageSize");Method getPageNumMethod = clazz.getMethod("getPageNum");Integer pageSize = (Integer) getPageSizeMethod.invoke(objects);Integer pageNum = (Integer) getPageNumMethod.invoke(objects);if (pageSize == null || pageNum == null) {throw new BusinessException("页码不能为空");}// 根据key设置相应的属性switch (key) {case "1":break;case "2":Method userIdMethod = clazz.getMethod("getUserId");if (StrUtil.isEmpty((String) userIdMethod.invoke(objects))) {throw new BusinessException("学工号不能为空");}break;case "3":Method user = clazz.getMethod("getUserId");Method getId = clazz.getMethod("getOrganizerId");if (StrUtil.isEmpty((String) user.invoke(objects)) && StrUtil.isEmpty((String) getId.invoke(objects))) {throw new BusinessException("学工号或主办单位ID不能为空");}}}