对称加密
什么是对称加密
对称加密算法是应用较早的加密算法，技术成熟。在对称加密算法中，数据发信方将明文（原始数据）和加密密钥（mi yao）一起经过特殊加密算法处理后，使其变成复杂的加密密文发送出去。收信方收到密文后，若想解读原文，则需要使用加密用过的密钥及相同算法的逆算法对密文进行解密，才能使其恢复成可读明文。在对称加密算法中，使用的密钥只有一个，发收信双方都使用这个密钥对数据进行加密和解密，这就要求解密方事先必须知道加密密钥。
特点
对称加密算法的特点是算法公开、计算量小、加密速度快、加密效率高。
不足之处是，交易双方都使用同样钥匙，安全性得不到保证。此外，每对用户每次使用对称加密算法时，都需要使用其他人不知道的惟一钥匙，这会使得发收信双方所拥有的钥匙数量呈几何级数增长，密钥管理成为用户的负担。对称加密算法在分布式网络系统上使用较为困难，主要是因为密钥管理困难，使用成本较高。而与公开密钥加密算法比起来，对称加密算法能够提供加密和认证却缺乏了签名功能，使得使用范围有所缩小。在计算机专网系统中广泛使用的对称加密算法有DES和IDEA等。美国国家标准局倡导的AES即将作为新标准取代DES。
实现
实现流程：
-
首先在页面加载完成时向后台发送ajax请求，后台随机生成一个16位的字符串key返回给前端
-
前端使用CryptoJS.js和后台生成的key对password进行加密
-
点击“登录”按钮后提交到后台，后台获取到加密后的密码进行解密后，把解密后的密码返回给前端展示出来。
效果：
代码：
导入依赖
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
Controller
package com.sean.jsencrypt.controller;
import cn.hutool.core.util.RandomUtil;
import org.apache.commons.lang3.RandomUtils;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import utils.AesUtils;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.HashMap;
import java.util.Map;
@Controller
public class AesController {
@GetMapping("/key")
@ResponseBody
private String create16String()
{
return RandomUtil.randomString(16);
}
@RequestMapping(value = "/login", method = RequestMethod.POST)
@ResponseBody
public Object login(HttpServletRequest request) throws Exception {
String userName = request.getParameter("userName");
String encryptedPassword = request.getParameter("password");
String key = request.getParameter("key");
String password = AesUtils.decrypt(encryptedPassword,key);
return password;
}
}
AesUtils工具类
package utils;
import org.apache.commons.codec.binary.Base64;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
public class AesUtils {
private static final String ALGORITHMSTR = "AES/ECB/PKCS5Padding";
public static String encrypt(String content, String key) {
try {
//获得密码的字节数组
byte[] raw = key.getBytes();
//根据密码生成AES密钥
SecretKeySpec skey = new SecretKeySpec(raw, "AES");
//根据指定算法ALGORITHM自成密码器
Cipher cipher = Cipher.getInstance(ALGORITHMSTR);
//初始化密码器，第一个参数为加密(ENCRYPT_MODE)或者解密(DECRYPT_MODE)操作，第二个参数为生成的AES密钥
cipher.init(Cipher.ENCRYPT_MODE, skey);
//获取加密内容的字节数组(设置为utf-8)不然内容中如果有中文和英文混合中文就会解密为乱码
byte [] byte_content = content.getBytes("utf-8");
//密码器加密数据
byte [] encode_content = cipher.doFinal(byte_content);
//将加密后的数据转换为字符串返回
return Base64.encodeBase64String(encode_content);
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
public static String decrypt(String encryptStr, String decryptKey) {
try {
//获得密码的字节数组
byte[] raw = decryptKey.getBytes();
//根据密码生成AES密钥
SecretKeySpec skey = new SecretKeySpec(raw, "AES");
//根据指定算法ALGORITHM自成密码器
Cipher cipher = Cipher.getInstance(ALGORITHMSTR);
//初始化密码器，第一个参数为加密(ENCRYPT_MODE)或者解密(DECRYPT_MODE)操作，第二个参数为生成的AES密钥
cipher.init(Cipher.DECRYPT_MODE, skey);
//把密文字符串转回密文字节数组
byte [] encode_content = Base64.decodeBase64(encryptStr);
//密码器解密数据
byte [] byte_content = cipher.doFinal(encode_content);
//将解密后的数据转换为字符串返回
return new String(byte_content,"utf-8");
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
}
前端html
<!DOCTYPE html>
<html lang="en"
xmlns:th="http://www.w3.org/1999/xhtml"
>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="/css/bootstrap.min.css">
<script src="/js/jquery-3.3.1.min.js" ></script>
<script src="/js/bootstrap.min.js" ></script>
<script src="https://cdn.bootcss.com/crypto-js/3.1.9-1/crypto-js.min.js"></script>
<title>AES</title>
<style>
.bgColor {
background-color: rgba(243, 66, 111, 0.15)
}
.divBorder {
border: solid 1px rgba(12, 24, 255, 0.15);
padding: 10px;
margin-top: 10px;
border-radius: 10px;
text-align: center;
vertical-align: middle;
}
.h4font {
margin-top: 0px;
font-family: 微软雅黑;
font-weight: 500;
}
.center {
padding: 20% 0;
}
.verifyInput {
vertical-align: middle;
font-size: 14px;
font-weight: normal;
line-height: 1;
/*border:1px solid #999;*/
float: left;
width: 180px;
height: 30px;
}
.verifyImage {
vertical-align: middle;
float: right;
height: 30px;
}
</style>
</head>
<body>
<div class="container">
<div class="row center">
<div class="divBorder col-sm-offset-4 col-sm-4">
<h3 class="panel panel-heading h4font">
用户登录
</h3>
<h4 name="msg" th:text="${msg}"></h4>
<input type="hidden" name="key" value="">
<form class="form-horizontal" method="post">
<div class="input-group">
<span class="input-group-addon"><i class="glyphicon glyphicon-user" aria-hidden="true"></i></span>
<input type="text" class="form-control" name="userName" placeholder="请输入用户名称"
th:value="${userName}"/>
</div>
<br>
<div class="input-group">
<span class="input-group-addon"><i class="glyphicon glyphicon-lock"></i></span>
<input type="text" class="form-control" name="password" th:value="${password}"
placeholder="请输入密码"/>
</div>
<br/>
<br>
<input type="button" name="btnLogin" class="btn btn-lg btn-block btn-info" value="登 录">
</form>
</div>
</div>
</div>
<script th:inline="javascript">
$(function () {
$.ajax({
type: "get",
url: "/key",
success: function (result) {
console.log(result);
$('input[name="key"]').val(result)
}
})
$('input[name="btnLogin"]').click(function () {
var $key = $('input[name="key"]').val();
var $userName = $('input[name="userName"]').val();
var $password = $('input[name="password"]').val();
var key = CryptoJS.enc.Utf8.parse($key);
console.log("key:" + key + ",$key:" + $key);
var password = CryptoJS.enc.Utf8.parse($password);
var encrypted = CryptoJS.AES.encrypt(password, key, {mode: CryptoJS.mode.ECB, padding: CryptoJS.pad.Pkcs7});
var encryptedPwd = encrypted.toString();
console.log("encrypted:" + encrypted);
console.log("encryptedPwd:" + encryptedPwd);
var decrypt = CryptoJS.AES.decrypt(encryptedPwd, key, {
mode: CryptoJS.mode.ECB,
padding: CryptoJS.pad.Pkcs7
});
var testDecryptStr = CryptoJS.enc.Utf8.stringify(decrypt).toString();
console.log("decrypt:" + decrypt);
console.log("testDecryptStr:" + testDecryptStr);
$.ajax({
type: "post",
url: "/login",
data: {userName: $userName, password: encryptedPwd, key: $key },
dataType: "json",
success: function (result) {
alert("后端解密后的密码："+result);
}
});
})
})
</script>
</body>
</html>
AES加密算法是通过后台随机生成的key进行密码的加密和解密的，是最为常见的对称加密算法之一
非对称加密
什么是非对称加密
非对称加密算法需要两个密钥：公开密钥（publickey:简称公钥）和私有密钥（privatekey:简称私钥）。公钥与私钥是一对，如果用公钥对数据进行加密，只有用对应的私钥才能解密。因为加密和解密使用的是两个不同的密钥，所以这种算法叫作非对称加密算法。
实现
实现流程：
效果：
实现步骤：
生成公钥和私钥
首先对于非对称加密的话必须要有公钥和私钥，产生公钥和私钥的方式有很多种，我使用支付宝开放平台开发助手工具生成，也可以使用在线生成
把生成的公钥和私钥保存起来，前端页面用公钥加密，后端通过私钥解密
代码：
导入依赖
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
Controller
@RestController
public class RsaController {
private static final String privateKey = "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";
@GetMapping("/rsaDecrypt")
public String DecryptAction(String data) throws Exception {
System.out.println(data);
String decrypt = RsaUtils.decryptByPrivateKey(privateKey, data);
return decrypt;
}
}
RSAUtils工具类
package utils;
import org.apache.commons.codec.binary.Base64;
import javax.crypto.Cipher;
import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
/**
* @author : sean
* @version V1.0
* @Project: jsencrypt
* @Package utils
* @date Date : 2021年09月23日 21:36
* @Description: RSA加解密工具类，实现公钥加密私钥解密和私钥解密公钥解密
*/
public class RsaUtils {
/**
* 公钥加密私钥解密
*/
private static void test1(RSAKeyPair keyPair, String source) throws Exception {
System.out.println("***************** 公钥加密私钥解密开始 *****************");
String text1 = encryptByPublicKey(keyPair.getPublicKey(), source);
String text2 = decryptByPrivateKey(keyPair.getPrivateKey(), text1);
System.out.println("加密前：" + source);
System.out.println("加密后：" + text1);
System.out.println("解密后：" + text2);
if (source.equals(text2)) {
System.out.println("解密字符串和原始字符串一致，解密成功");
} else {
System.out.println("解密字符串和原始字符串不一致，解密失败");
}
System.out.println("***************** 公钥加密私钥解密结束 *****************");
}
/**
* 私钥加密公钥解密
*
* @throws Exception
*/
private static void test2(RSAKeyPair keyPair, String source) throws Exception {
System.out.println("***************** 私钥加密公钥解密开始 *****************");
String text1 = encryptByPrivateKey(keyPair.getPrivateKey(), source);
String text2 = decryptByPublicKey(keyPair.getPublicKey(), text1);
System.out.println("加密前：" + source);
System.out.println("加密后：" + text1);
System.out.println("解密后：" + text2);
if (source.equals(text2)) {
System.out.println("解密字符串和原始字符串一致，解密成功");
} else {
System.out.println("解密字符串和原始字符串不一致，解密失败");
}
System.out.println("***************** 私钥加密公钥解密结束 *****************");
}
/**
* 公钥解密
*
* @param publicKeyText
* @param text
* @return
* @throws Exception
*/
public static String decryptByPublicKey(String publicKeyText, String text) throws Exception {
X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(Base64.decodeBase64(publicKeyText));
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.DECRYPT_MODE, publicKey);
byte[] result = cipher.doFinal(Base64.decodeBase64(text));
return new String(result);
}
/**
* 私钥加密
*
* @param privateKeyText
* @param text
* @return
* @throws Exception
*/
public static String encryptByPrivateKey(String privateKeyText, String text) throws Exception {
PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(Base64.decodeBase64(privateKeyText));
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, privateKey);
byte[] result = cipher.doFinal(text.getBytes());
return Base64.encodeBase64String(result);
}
/**
* 私钥解密
*
* @param privateKeyText
* @param text
* @return
* @throws Exception
*/
public static String decryptByPrivateKey(String privateKeyText, String text) throws Exception {
PKCS8EncodedKeySpec pkcs8EncodedKeySpec5 = new PKCS8EncodedKeySpec(Base64.decodeBase64(privateKeyText));
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec5);
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.DECRYPT_MODE, privateKey);
byte[] result = cipher.doFinal(Base64.decodeBase64(text));
return new String(result);
}
/**
* 公钥加密
*
* @param publicKeyText
* @param text
* @return
*/
public static String encryptByPublicKey(String publicKeyText, String text) throws Exception {
X509EncodedKeySpec x509EncodedKeySpec2 = new X509EncodedKeySpec(Base64.decodeBase64(publicKeyText));
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec2);
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
byte[] result = cipher.doFinal(text.getBytes());
return Base64.encodeBase64String(result);
}
/**
* 构建RSA密钥对
*
* @return
* @throws NoSuchAlgorithmException
*/
public static RSAKeyPair generateKeyPair() throws NoSuchAlgorithmException {
KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
keyPairGenerator.initialize(1024);
KeyPair keyPair = keyPairGenerator.generateKeyPair();
RSAPublicKey rsaPublicKey = (RSAPublicKey) keyPair.getPublic();
RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) keyPair.getPrivate();
String publicKeyString = Base64.encodeBase64String(rsaPublicKey.getEncoded());
String privateKeyString = Base64.encodeBase64String(rsaPrivateKey.getEncoded());
RSAKeyPair rsaKeyPair = new RSAKeyPair(publicKeyString, privateKeyString);
return rsaKeyPair;
}
/**
* RSA密钥对对象
*/
public static class RSAKeyPair {
private String publicKey;
private String privateKey;
public RSAKeyPair(String publicKey, String privateKey) {
this.publicKey = publicKey;
this.privateKey = privateKey;
}
public String getPublicKey() {
return publicKey;
}
public String getPrivateKey() {
return privateKey;
}
}
}
前端html
<!DOCTYPE html >
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Login</title>
<script src="https://blog.yoodb.com/app/default/js/jquery-2.1.4.min.js"></script>
<script src="http://passport.cnblogs.com/scripts/jsencrypt.min.js"></script>
<script type="text/javascript">
$(function () {
$("#btn").click(function () {
let inputData = $('#data').val();
let encrypt = new JSEncrypt();
encrypt.setPublicKey("MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDXQHkn4dX3oUppqr2Vj7pBEDoe5Y+wJuTFqVImFU7xyDHCzwVY40q8/2OCmoMnrnjORL6Yh7UZl9GQ/FOvJHAnXrClU2mMRDzhTG9tw4mvsfDk/EHpJ+oCDUmlSqp1rG78mc89rjXqoaRzSsdqYB9bnpBHVjG8r1gmcRqKvCpuvQIDAQAB");
let data = encrypt.encrypt(inputData);
$("#encrypt").val(data);
$.ajax({
type: "GET",
url: "/rsaDecrypt",
data:{
data:data
},
success: function (result) {
console.log(result);
$("#decrypt").val(result);
}
})
})
});
</script>
</head>
<body>
<div>
<div>
<label> 请输入要加密的字符串：</label>
<input type="text" id="data" value="" />
<button id = btn >发送</button>
</div>
<div style=" margin-top: 20px">
<label>前端加密后：</label>
<textarea id="encrypt"></textarea>
</div>
<div style=" margin-top: 20px">
<label>后端解密后：</label>
<textarea id="decrypt"></textarea>
</div>
</div>
</body>
</html>
RAS则是一种非对称加密算法
原文章地址：
https://www.cnblogs.com/seanRay/p/15336332.html
标签：加密,String,解密,秘钥,Cipher,key,import,java From： https://www.cnblogs.com/2393920029-qq/p/16599818.html