JAVA 简单实现AES加密

JAVA 简单实现AES加密

昨天有个功能，跟其他系统对接，所以研究了下AES加密，综合的几个博客，新建了个demo。
效果预览，原理什么的就不解释了（因为我也不大懂(-_ - *)，看着好像都差不多，凑合方法整成能用就行）
效果预览
好处是不用外部jar包

新建个随便整个springboot工程，搞个手写个工具类

ption.demo;pto.*;
pto.spec.IvParameterSpec;
pto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.security.*;
import java.util.Arrays;/*** @Description AES加密工具类* @Author 古大帅哥* @Date 2020/5/20 14:19*/
public class AesUtils {private IvParameterSpec iv;private SecretKeySpec keySpec;public AesUtils(byte[] aesKey) {if (aesKey == null || aesKey.length < 16) {throw new RuntimeException("错误的初始密钥");}keySpec = new SecretKeySpec(aesKey, "AES");this.iv = new IvParameterSpec(getMD5Bytes(aesKey));}public AesUtils(byte[] aesKey, byte[] iv) {if (aesKey == null || aesKey.length < 16 || (iv != null && iv.length < 16)) {throw new RuntimeException("错误的初始密钥");}if (iv == null) {iv = getMD5Bytes(aesKey);}keySpec = new SecretKeySpec(aesKey, "AES");this.iv = new IvParameterSpec(iv);}public byte[] encryptBytes(String data){Cipher cipher;byte[] result = null;try {cipher = Instance("AES/CFB/NoPadding");try {cipher.init(cipher.ENCRYPT_MODE, keySpec, iv);} catch (InvalidAlgorithmParameterException e) {e.printStackTrace();}result = cipher.Bytes());} catch (NoSuchPaddingException | InvalidKeyException | NoSuchAlgorithmException | IllegalBlockSizeException | BadPaddingException e) {e.printStackTrace();}return result;}public String decryptBytes(byte[] data){Cipher cipher;try {cipher = Instance("AES/CFB/NoPadding");cipher.init(Cipher.DECRYPT_MODE, keySpec, iv);data = cipher.doFinal(data);} catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException | IllegalBlockSizeException | BadPaddingException | InvalidAlgorithmParameterException e) {e.printStackTrace();}return new String(data);}public static Key randomKey(int size) {byte[] result = null;Key  key;try {KeyGenerator gen = Instance("AES");gen.init(size, new SecureRandom());result = ateKey().getEncoded();key = new SecretKeySpec(result, "AES");} catch (Exception e) {throw new RuntimeException(e);}return key;}public byte[] getMD5Bytes(byte[] data){MessageDigest md5 = null;try{md5 = Instance("MD5");}catch (Exception e){e.printStackTrace();}String s = new String(data);char[] charArray = s.toCharArray();byte[] byteArray = new byte[charArray.length];for (int i = 0; i < charArray.length; i++) {byteArray[i] = (byte) charArray[i];}byte[] md5Bytes = md5.digest(byteArray);StringBuffer hexValue = new StringBuffer();for (int i = 0; i < md5Bytes.length; i++){int val = ((int) md5Bytes[i]) & 0xff;if (val < 16){hexValue.append("0");}hexValue.HexString(val));}String().substring(8,24).getBytes();}public static SecretKeySpec getKey(String password) throws UnsupportedEncodingException {int keyLength = 128;byte[] keyBytes = new byte[keyLength / 8];Arrays.fill(keyBytes, (byte) 0x0);byte[] passwordBytes = Bytes("UTF-8");int length = passwordBytes.length < keyBytes.length ? passwordBytes.length : keyBytes.length;System.arraycopy(passwordBytes, 0, keyBytes, 0, length);SecretKeySpec key = new SecretKeySpec(keyBytes, "AES");return key;}
}

demo测试类
为了模拟接受端和发送端，另建了个工具类AesUtils2，代码跟上面的一样，就不重复贴了

ption;ption.demo.AesUtils;
ption.demo.AesUtils2;
import com.s.internal.impl.dv.util.HexBin;
import org.junit.jupiter.api.Test;import java.io.UnsupportedEncodingException;
import java.security.Key;/*** @Description 加密测试类* @Author 古大帅哥* @Date 2020/5/20 9:33*/public class EncryptionTest {@Testpublic void test() throws UnsupportedEncodingException {//发送端Key key1 = Key("{>|?23432512343dskljffy@123");AesUtils aesUtils = new Encoded());String str = "{"APY18":"FE企业版","ISMORSPS_REGISTE":"2020-05-19 00:00:00.0","APY17":"没有","APY19":"22","APY10":"场馆中心综合科科长","APY12":"56","APY11":"13766589422","APY14":"6565","APY13":"656","APY16":"2018-12-26 00:00:00.0","APY15":"6565","SERVICE_ID":"5","ACCOUNT_MANAGER":"徐xx","LOCAL_MAINTAIN_END":"2020-05-19 00:00:00.0","CONTRACT_NO":"","APY32":"D4592347-0A29-530C-AC5A-CC7FF1DE515D","APY31":"","APY34":"FE6.0.2企业版","APY33":"场馆管理中心APP开发项目","UFIDA_PASSWORD":"4","APY30":"4","SERVICE_PASSWORD":"4","LOCAL_MAINTAIN_BEGIN":"2018-12-27 00:00:00.0","APY29":"是","APY28":"4","ISMORSPS_DUE":"2020-05-19 00:00:00.0","APY8":"深圳信息职业技术学院","APY21":"500","APY20":"500","ABC01":"终端客户","APY23":"","APY22":"565665","APY4":"邓水平","APY25":"mysql5.6","ABC04":"深信息","APY24":"","APY27":"2018-12-26 00:00:00.0","APY26":"44","ABC06":"深圳市龙岗区龙翔大道"}";byte[] encriptBytes = ptBytes(str);//转换成16进制字符串传输String s = de(encriptBytes);//接收端System.out.println("接受端获取密文" + s);Key key2 = Key("{>|?23432512343dskljffy@123");AesUtils2 aesUtils2 = new Encoded());//16进制转换成2进制byte[] decode = HexBin.decode(s);byte[] data = aesUtils2.decryptBytes(decode);System.out.println("解密后明文：" + new String(data, "UTF-8"));}}

第二天，同事给了链接
/%E5%AF%B9%E7%A7%B0%E5%8A%A0%E5%AF%86-SymmetricCrypto
看了看，默默把昨天的代码删掉，尼玛有这种现成好东西等老子弄完了才给我。。。。
区别是：
一、需要导包
二、更简单

		<dependency><groupId>cn.hutool</groupId><artifactId>hutool-all</artifactId><version>5.3.5</version></dependency>

demo上面文档里面有，由于过于简单，贴个解密的demo,加密基本一样

ller;import util.CharsetUtil;
import util.RandomUtil;
import pto.Mode;
import pto.Padding;
import pto.SecureUtil;
import pto.symmetric.AES;
import pto.symmetric.SymmetricAlgorithm;
import com.s.internal.impl.dv.util.HexBin;
sthttp.httprequest.utils.AesUtils;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;pto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.security.Key;/*** @Description* @Author 古大帅哥* @Date 2020/5/21 11:30*/
@Controller
public class HelloController {private static String LOCAL_KEY = "11111111";@ResponseBody@RequestMapping("/getMessage")public String getMessage(@RequestParam("data") String data, @RequestParam("key") String key){System.out.println("接受密钥："+ key);System.out.println("接受密文:" + data);String realkey = SecureUtil.md5(key).substring(7, 15);try {//解密AES aes = new AES(Mode.CTS, Padding.PKCS5Padding, (LOCAL_KEY + realkey).getBytes("UTF-8"), "0102030405060708".getBytes("UTF-8"));String ss = aes.decryptStr(data,  CharsetUtil.CHARSET_UTF_8);System.out.println("解密后密钥：" + realkey);System.out.println("解密后明文：" + ss);} catch (UnsupportedEncodingException e) {e.printStackTrace();}return "hello";}
}

其实代码就两行，

AES aes = new AES(Mode.CTS, Padding.PKCS5Padding, (“16位长度的字符串”).getBytes("UTF-8"), "0102030405060708".getBytes("UTF-8"));
String ss = aes.decryptStr(data,  CharsetUtil.CHARSET_UTF_8);

加密同样，只要保证那16位字符串的密钥相同即可

所以我做了写其他的骚操作，如demo中的，我传了个动态字符串key，然后再MD5加密(固定返回32位字符串)，截取其中的8位进行拼接还原真正的密钥（加密同理），这样被人家拦截也难篡改

部分请求端代码

public void sendMessage(String id) throws UnsupportedEncodingException {String data = getAcceptJsonString(id);Properties properties = null;try {properties = PropertiesLoaderUtils.loadProperties(new ClassPathResource("fy.properties"));} catch (IOException e) {println("找不到配置文件");}String key = Property("ENCRYPT_KEY");String s2 = RandomUtil.randomString(32);String s3 = SecureUtil.md5(s2).substring(7, 15);//拼接密钥，加密数据AES aes = new AES(Mode.CTS, Padding.PKCS5Padding, (key + s3).getBytes("UTF-8"), "0102030405060708".getBytes("UTF-8"));String s1 = ptHex(data);Map<String,Object> map = new HashMap<>();map.put("data", "map");map.put("key", s2);HttpRequest.post("localhost:8087/hello").form(data).timeout(20000).execute().body();}

执行请求结果

不得不说，Hutool这个工具库实在太好用，开发效率很高，很多东西比如加密，发起http请求这些东西就帮你封装好，一两行代码就可以执行，给他点个赞👍