登录功能使用RSA加密解密-下代码

1、用后台代码生成公钥、私钥，前端用公钥加密，后端用私钥解密
```java
package com.cms.util;

import com.jfinal.kit.Base64Kit;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.security.*;
import java.security.interfaces.RSAKey;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.Base64;
import java.util.regex.Pattern;

/**
 * @author Ricky Fung
 */
public class RSAUtils {

private static final String RSA_ALGORITHM = "RSA";

public static String getPublicKey(PublicKey publicKey) {
        return Base64Kit.encode(publicKey.getEncoded());
    }

public static String getPrivateKey(PrivateKey privateKey) {
        return Base64Kit.encode(privateKey.getEncoded());
    }

//------------------------------
    /**
     * generate KeyPair
     * @return
     * @throws NoSuchAlgorithmException
     */
    public static KeyPair generateKeyPair(int keySize) throws NoSuchAlgorithmException {
        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(RSA_ALGORITHM);
        keyPairGenerator.initialize(keySize);
        return keyPairGenerator.genKeyPair();
    }

// 私钥解密
    public static String decryptByPrivateKey(String privateKeyText, String text) throws Exception {
        PKCS8EncodedKeySpec pkcs8EncodedKeySpec5 = new PKCS8EncodedKeySpec(Base64.getDecoder().decode(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.getDecoder().decode(text));
        return new String(result);
    }

public static boolean isPassword(String password) {
        //密码规则为:长度8-20位,必须包含英文大小写,数字及特殊符号
        String pattern = "^(?=.*\\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[!@#$%^&*(\\)_+=\\[\\]{}|:,./<>?]).{8,20}$";
        return Pattern.matches(pattern, password);
    }

public static void main(String[] args) throws Exception{
        System.out.println(isPassword("Srcb@1234"));
//        KeyPair keyPair = RSAUtils.generateKeyPair(1024);
//        PublicKey pubKey = keyPair.getPublic();
//        PrivateKey priKey = keyPair.getPrivate();
//
//        String  publicKey = RSAUtils.getPublicKey(pubKey);
//        String  privateKey = RSAUtils.getPrivateKey(priKey);
//
//
//        System.out.println("publicKey:"+publicKey);
//        System.out.println("privateKey:"+privateKey);
//
//
//        try {
//            String usernameDecodeBuf = RSAUtils.decryptByPrivateKey("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","SRPE/BUm/fk8uCyOjcvBYOiGWSpI3p2/Arndyx4m3GECVV4YG3t74zzw54zfvhO6IW8cZ86UGBqqpgeBOv6ajZz/696KtsLxI7VssgkwMSgY5i68V1mA6H98rw3wA/pJN0vOheKC3yAr1O3oyrOHX/KSGNPTu/HwkxgBPsvoXRR49yEx3G8rFL8w2H3j/zcgQiQXPR/g4Z2TTA6WqzIi2JlnwQQO5a381/OOy0Yuf+OQIrzD4DFYzbo3o+DVVfK27enigQVkjHf3dDmz37Yy4SB6/ftA5ThGQoOmAZ5kp/o51OjSr+DEUtbDuyIzQRIlono79se0AHraLUWXGUUBDw==");
//            System.out.println(usernameDecodeBuf);
//
//        } catch (UnsupportedEncodingException e) {
//            throw new RuntimeException(e);
//        }
    }
}

```
2、前端引用RAS.js加密
RSA.js下载地址:https://www.123pan.com/s/bV55Vv-zs5IA.html
```html
<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>管理中心</title>
    <meta content="width=device-width,initial-scale=1,maximum-scale=1,user-scalable=no" name="viewport">
    
    <link rel="stylesheet" href="#(base)/admindec/static/plugins/bootstrap/css/bootstrap.min.css">
    <link rel="stylesheet" href="#(base)/admindec/static/plugins/font-awesome/css/font-awesome.min.css">
    <link rel="stylesheet" href="#(base)/admindec/static/plugins/ionicons/css/ionicons.min.css">
    <link rel="stylesheet" href="#(base)/admindec/static/plugins/adminLTE/css/AdminLTE.css">
    <link rel="stylesheet" href="#(base)/admindec/static/plugins/iCheck/square/blue.css">
    <script>if(window.top !== window.self){ window.top.location = window.location;}</script>
    <script>if(window.top.location.href.indexOf("#(base)/admindec/login")==-1){ window.top.location.href="#(base)/admindec/login";}</script>
</head>
<body class="hold-transition login-page">
    <div class="login-box">
        <div class="login-logo">
            	后台管理系统
        </div>
        
        <div class="login-box-body">
            <p class="login-box-msg">登录系统</p>
            <form id="inputForm">
                <div class="form-group has-feedback">
                    <input type="text" id="username" name="username" value="" class="form-control" placeholder="用户名">
                    <span class="glyphicon glyphicon-user form-control-feedback"></span>
                </div>
                <div class="form-group has-feedback">
                    <input type="password" id="password" name="password" value="" class="form-control" placeholder="密码">
                    <span class="glyphicon glyphicon-lock form-control-feedback"></span>
                </div>
                <div class="row">
                    <div class="col-md-6">
                        <div class="form-group has-feedback">
                            <input type="password" id="code" name="code" value="" class="form-control" placeholder="验证码">
                            <span class="glyphicon glyphicon-lock form-control-feedback"></span>
                        </div>
                    </div>
                    <div class="col-md-6">
                        <div class="form-group has-feedback">
                            <img id="srcImg" src="#(base)/common/captcha/image" style="height:34px;"/>
                        </div>
                    </div>
                </div>
                <div class="row">
                    
                    <div class="col-xs-4">
                        <button type="submit" class="btn btn-primary btn-block btn-flat">登录</button>
                    </div>
                    
                </div>
            </form>
        </div>
        
    </div>
    
    <script src="#(base)/admindec/static/plugins/jQuery/jquery-2.2.3.min.js"></script>
    <script src="#(base)/admindec/static/plugins/bootstrap/js/bootstrap.min.js"></script>
    <script src="#(base)/admindec/static/plugins/sweetalert/sweetalert.min.js"></script>
    <script src="#(base)/admindec/static/js/RSA.js"></script>
    <script>
        $(function() {

});
    </script>
</body>
</html>
<script type="text/javascript">
$().ready( function() {

$("#srcImg").click(
        function() {
            var t = new Date().getTime();//防止页面缓存，使用时间戳
            $("#srcImg").attr(
                'src',
                "#(base)/common/captcha/image?"
                + t);
        });

var $inputForm = $("#inputForm");
	var $username = $("#username");
	var $password = $("#password");
    var $code = $("#code");

// 表单验证
	$inputForm.submit( function() {
		if ($username.val() == "") {
			swal({title:'', text:'请输入您的用户名',icon: 'error'});
			return false;
		}
		if ($password.val() == "") {
			swal({title:'', text:'请输入您的密码',icon: 'error'});
			return false;
		}
        if ($code.val() == "") {
            swal({title:'', text:'请输入验证码',icon: 'error'});
            return false;
        }
		swal({title:'', text:'登录中',icon: 'info',button:false});

var encrypt = new JSEncrypt();
        encrypt.setPublicKey("MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCco1zfwbvcffnJCglr6z6IWmSo9xWNH5nKOgVwjEVLqttCqqcPa6/0MTwugOqOWP0Lso6OKTZKZM9dek07vmvefXu8fZ8D9ZCw6ZBQRNxWpQ/PUe9+DLFOAauCjIEeGqCT/trxp4QKhL4Qt+XLSnwzvJAO2u4jeiZDVviYQ6vjuQIDAQAB");
        var usernameEncrypted = encrypt.encrypt($username.val());
        var passwordEncrypted = encrypt.encrypt($password.val());

$.ajax({
			url: "#(base)/admindec/login/login",
			type: "POST",
			data: {"username":usernameEncrypted,"password":passwordEncrypted,"code":$code.val()},
			dataType: "json",
			cache: false,
			success: function(response) {
				if (response.type=="success") {
					swal({title:'', text:'登录成功',icon: 'success',button:false,timer: 2000}).then(function(){
						location.href="#(base)/admindec/index";
					});
				}else{
					swal({title:'', text:response.msg,icon: 'error'});
				}
			},
			error:function(response){
				swal({title:'', text:'系统异常',icon: 'error'});
			}
		});
		return false;
	});
});
</script>

```
3、后端接收RSA加密数据并用私钥解密
```java
/*
 *
 *
 *
 */
package com.cms.controller.admin;

import java.util.HashMap;

import com.cms.util.RSAUtils;
import org.apache.commons.codec.digest.DigestUtils;

import com.cms.Feedback;
import com.cms.entity.Admin;
import com.cms.routes.RouteMapping;

/**
 * Controller - 管理员登录
 *
 *
 *
 */
@RouteMapping(url = "/admindec/login")
public class LoginController extends BaseController {

/**
     * 登录
     */
    public void index() {
        render(getView("login/index"));
    }

/**
     * 登录
     */
    public void login(){
    	String username = getPara("username");
        String password = getPara("password");
        if(!validateCaptcha("code")){
            renderJson(Feedback.error("验证码错误!"));
            return;
        }
        String privateKey="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";
        try {
            username = RSAUtils.decryptByPrivateKey(privateKey,username);
            password = RSAUtils.decryptByPrivateKey(privateKey,password);
        } catch (Exception e) {
            renderJson(Feedback.error("用户名密码错误!"));
            return;
        }
        if(!RSAUtils.isPassword(password)){
            renderJson(Feedback.error("用户名密码错误!"));
            return;
        }
        Admin admin = new Admin().dao().findByUsername(username);
        if(admin==null){
            renderJson(Feedback.error("用户名密码错误!"));
            return;
        }

if(!admin.getPassword().equals(DigestUtils.md5Hex(password))){
    		renderJson(Feedback.error("用户名密码错误!"));
    		return;
        }
        getSession().setAttribute(Admin.SESSION_ADMIN, admin);
        renderJson(Feedback.success(new HashMap<>()));
    }

}

```

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登录功能使用RSA加密解密

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