逆向案例和Java入门

day04 逆向案例和Java入门

课堂随笔

day04 逆向案例和Java入门

今日概要:
    - 逆向案例
    - Java环境入门

1.逆向案例
    - 爱安丘   【更新,抓不到包+客户端证书校验】
    - 美食天下

    - 油联合伙人【服务器关闭】
    - 尿大夫

    1.1 美食天下
        目标:关键字搜索

        - 抓包 & 分析
            https://api6.meishichina.com/api.php
            POST
            请求体:
                p={"m":{"search_mobileHotSearch":{"keyword":"红烧排骨","pageindex":1,"pagesize":20,"type":"recipe"}},"openudid":"6a956ef804512bd9ee73b580f2c0bf5d","uid":"","session":"","appver":"6311","device":"google+Pixel+4","appname":"msc_android"}
            请求头:
                无

        - 思考:参数的必要性(改包+发送)
            - 删除测试
            - 固定测试

        - 不需逆向openudid,直接去请求发送

        - 实现:...

    1.2 爱安丘
        目标:登录&注册
        - 抓包
            - 无法抓包,解决方案:LSposed + JustTrustMe(不着急操作)
        - 分析:发送短信 + 登录
            - 发短信
                https://app-auth.iqilu.com/member/phonecode
                POST
                请求体:
                    {"phone":"18630087660"}
                请求头:
                    user-agent: chuangqi.o.137.com.iqilu.app137/0.0.28.108
                    orgid: 137
                    cq-agent: {"os":"android","imei":"aabaf0fe375e5a2c","osversion":"10","network":"none","version":"0.0.28.108","core":"1.6.4"}
                    Content-Type: application/json

                COOKIE
                    Cookie: orgid=137

                返回值:
                    {
                        "code": 1,
                        "data": "s0HTsAzo+o7vKxxO68we74wmTvFzliX6cE6V+gKW7xk="
                    }
            - 登录
                POST
                请求体:
                    {"phone":"18630087660","code":"123456","key":"s0HTsAzo+o7vKxxO68we74wmTvFzliX6cE6V+gKW7xk=","password":"","captcha":"","captchaKey":""}

                请求头:
                    orgid: 137
                    cq-agent: {"os":"android","imei":"aabaf0fe375e5a2c","osversion":"10","network":"none","version":"0.0.28.108","core":"1.6.4"}
                    Content-Type: application/json
                    Content-Length: 135
                    Host: app-auth.iqilu.com
                    Connection: Keep-Alive
                    Accept-Encoding: gzip
                COOKIE
                    Cookie: orgid=137

        - 直接实现:...

    小结:抓包分析就可以找到规律,用代码去模拟实现即可。
    问题:关于接收短信
        - 手动方式
        - 自动方式(接码平台)
            - 获取手机号:发送API,返回手机号
            - 接码:发送API+手机号,短信内容返回

        - 自动方式(卡商)
            - 卖你手机号 18777777777      http://www.xxx.com?token=asdfasdfadf8aodf0ausdf
            - ...

    1.3 尿大夫

        - 抓包
            https://api.niaodaifu.cn/v4/site/loginnew
            POST
            请求体:
                {
                    "devisetoken": "1507bfd3f6d1bbf4486",      # 可以忽略
                    "password": "6q7uwhdjjd",
                    "mobile": "15639966666",
                    "channel": "android",
                    "sign": "0d5c04753937acdb7db038ad39942966", #
                    必须逆向
                    "time": "1680874075",
                    "mechanism": "0",
                    "platform": "1"
                  }

        - 改包&发送
            只要逆向出请求体中的sign即可

        - 反编译apk
        - 定位
            - 搜索:"sign"

             long currentTimeMillis = System.currentTimeMillis() / 1000;

        - Hook校验
            j= 1680875681
            返回值= 23c42ffd7f234f4d28bca48d10c021c8

        - 还原算法

    1.4 油联合伙人
        目标:自动登录

        - 抓包(无法抓取,服务器停止)
            请求方式:POST
            请求地址:https://chinayltx.com/app/api/v1/partnerLogin/login
            请求体:
                phone=18630087660
                password=e10adc3949ba59abbe56e057f20f883e  【逆向】【搞定】
            请求头:
                X-App: native
                X-Noncestr: 123456
                X-OS: partnerApp_android
                X-Req-Time: 1650980779832
                X-Sign: 645b299fc29998e390d60d95a9b1ac5a   【逆向】【搞定】
                X-Token:
                X-UserID:

        - 反编译 + 代码位置

            1.搜:/v1/partnerLogin/login

            2.代码
                    # 手机号
                    # 密码
                 return this.mRepository.loginWithToken(this.name, this.pwd);

                 this.mLoginUseCase.setPwd(    Md5.md5(str2)      );

        - Hook md5
            ...
            pwd,其实就是对输入的密码明文进行md5加密的结果。

    小结:反编译+定位代码+Hook+还原

    毫无头绪:
        - Java不懂
        - 安卓不懂



2.Java环境搭建【正向+逆向案例】
    - 安装JDK(上节搞定)
        安装目录/bin/java.exe
    - 系统环境变量(上节搞定)
        安装目录/bin/
    - 编写代码+运行
        - txt文本文档编写 + 终端运行  【太费劲】
        - IntelliJ IDEA

    2.1 安装IntelliJ 专业版
        - 激活工具v1: 2020.1        【破解包】jetbrains-agent-latest.zip
            https://www.zhihu.com/zvideo/1254435808801050624

        - 激活工具v2: 2021   2022   【破解包】windows.zip
            - 安装2021
            - 解压 windows.zip -> 文件夹

            https://www.bilibili.com/video/BV1JP411V7Gv/?spm_id_from=333.999.0.0

            注意:激活之后,发现其他pycharm无法运行或闪退。

        - 你曾经激活Pycharm,可以参考之前的方式(IntelliJ )

    2.2 编写&运行代码
        ...
如果你会安卓开发:

1.定义接口
    import retrofit2.http.Field;
    import retrofit2.http.FormUrlEncoded;
    import retrofit2.http.GET;
    import retrofit2.http.POST;
    import retrofit2.http.Query;

    public interface NetworkApi {

        @FormUrlEncoded
        @POST("api/v1/partnerLogin/login")
        Observable<HttpResult<LoginInfo>> submitLogin(@Field("phone") String str, @Field("password") String str2);

    }


2.代码位置调用
    NetworkApi.submitLogin("18630087660", "qwe123")

    内部自动会发送请求:
        地址:api/v1/partnerLogin/login   POST
        参数:
            phone = “18630087660”
            password = "qwe123"
            phone=18630087660&password=qwe123

1.案例:油联合伙人

目标:实现自动登录

注意:当前APP服务器连接不上,无法运行抓包,请参考抓包截图。

1.1 抓包

image-20220707175625242

请求方式:POST
请求地址:https://chinayltx.com/app/api/v1/partnerLogin/login
请求体:
	phone=18630087660
	password=e10adc3949ba59abbe56e057f20f883e
请求头:
	X-App: native
    X-Noncestr: 123456
    X-OS: partnerApp_android
    X-Req-Time: 1650980779832
    X-Sign: 645b299fc29998e390d60d95a9b1ac5a
    X-Token: 
    X-UserID: 

接下来要解决:

  • password是怎么加密的?
  • X-Sign是怎么加密?

1.2 逆向

请求方式:POST
请求地址:https://chinayltx.com/app/api/v1/partnerLogin/login
请求体:
	phone=18630087660
	password=e10adc3949ba59abbe56e057f20f883e
请求头:
	X-App: native
    X-Noncestr: 123456
    X-OS: partnerApp_android
    X-Req-Time: 1650980779832
    X-Sign: 645b299fc29998e390d60d95a9b1ac5a
    X-Token: 
    X-UserID: 

接下来要解决:

  • password是怎么加密的?
  • X-Sign是怎么加密?

1.password算法

根据特点去搜索,可能搜到很多东西。

password    "password"     password=
phone
/v1/partnerLogin/login

image-20220426221356319

image-20220426221453870

image-20220426221556306

image-20220426221651437

image-20220426221839394

image-20220426221941928

image-20220426222046226

按理说md5加密:

  • 明文:123456
  • 密文:e10adc3949ba59abbe56e057f20f883e
import hashlib

obj = hashlib.md5()
obj.update("123456".encode('utf-8'))
res = obj.hexdigest()
print(res) # e10adc3949ba59abbe56e057f20f883e

2.X-Sign算法

X-Sign

image-20220426222506713

image-20220707181047833

import hashlib

token = ""
reqTime = "1657201079926"
nonce_str = "123456"
nonce_str_sub_2 = nonce_str[2:]
body_string = "phone=18630099999&password=4297f44b13955235245b2497399d7a93"

encrypt_string = f"{token}{reqTime}{nonce_str_sub_2}{body_string}"

obj = hashlib.md5()
obj.update(encrypt_string.encode('utf-8'))
res = obj.hexdigest()
print(res)

1.3 实现代码

import time
import hashlib

import requests


def md5(data_string):
    obj = hashlib.md5()
    obj.update(data_string.encode('utf-8'))
    return obj.hexdigest()


def run():
    phone = input("请输入手机号:")
    password = input("请输入密码:")
    encrypt_password = md5(password)

    token = ""
    req_time = str(int(time.time() * 1000))
    nonce_str = "123456"
    nonce_str_sub_2 = nonce_str[2:]
    body_string = f"phone={phone}&password={encrypt_password}"
    encrypt_string = f"{token}{req_time}{nonce_str_sub_2}{body_string}"

    sign = md5(encrypt_string)

    res = requests.post(
        url="https://chinayltx.com/app/api/v1/partnerLogin/login",
        data={
            "phone": phone,
            "password": encrypt_password,
        },
        headers={
            "X-App": "native",
            "X-Noncestr": nonce_str,
            "X-OS": "partnerApp_android",
            "X-Req-Time": req_time,
            "X-Sign": sign,
            "X-Token": token,
            "X-UserID": ""
        }
    )

    print(res.text)


if __name__ == '__main__':
    run()

2.java入门

2.1 环境搭建

  • Python,解释型编程语言。

    # xx.py
    print("爬虫逆向开发")
    print("结束")
    
    >>>Python解释器的路径 代码文件的路径
    >>>C:\python39\python.exe  代码文件的路径
    
    C:\python39\加入环境变量。
    >>>python xx.py
    
  • Java,编译型&解释型语言。(编译型 vs 解释器)

    // Hello.java
    String name = "武沛齐";
    
    System.out.println(name);
    

    在执行代码时,需要对代码先进行编译。

    >>>java安装bin目录下javac  Hello.java
    >>>javac Hello.java
    
    Hello.class
    

    编译完成之后,你会得到一个文件 Hello.class,去运行代码。

    >>>java Hello
    

image-20210929141555448

  • JRE,( Java Runtime Envrionment ),Java 运行时环境。

    含JVM和运行必备的类库。
    
    电脑上想要运行java程序,就必须安装JRE。
    
  • JDK,( Java Development Kit ),Java开发工具。【包含JRE】【Java开发】

    含JRE 和 开发必备的工具。
    工具包含:编译工具javac.exe 和 运行工具java.exe
    想要开发Java应用程序,就必须安装JDK。
    

接下来,我们就来下载和安装吧。

JDK8(jdk 1.8)版本(目前最新已到17)

官方地址:https://www.oracle.com/java/technologies/downloads/#java8
百度云盘:资源目录

安装好之后需要配置下环境变量。

image-20210929163956511

image-20210929163410661

关于mac系统,自带JDK:

image-20210929152514354

/Library/Java/JavaVirtualMachines 

image-20210929152444076

编写代码+编译+运行:

  • 编写Java代码:Hello.java

    public class Hello {
        public static void main(String[] args) {
            System.out.println("Hello World");
        }
    }
    
  • 打开终端去运行命令

    >>>javac Hello.java
    >>>java Hello
    

2.2 Inteliji

编写Java代码时建议大家使用IDE(集成开发环境)来提供开发效率。

  • 下载,建议【2020.1.1版本】

    https://www.jetbrains.com/idea/download/other.html
    
  • 激活

    视频:https://www.zhihu.com/zvideo/1254435808801050624
    激活包:在网盘共享目录,其他共享资料包文件夹【jetbrains-agent-latest.zip】
    

image-20220127202943378

2.3 Java基础语法

初步代码的分析:Hello.java

public class Hello {
    public static void main(String[] args) {
        System.out.println("你好呀");
    }
}
  • 主函数 & 程序的入口。

    def func():
        pass
    
    if __name__ == "__main__":
    	func()
    
  • 文件名

    一个文件中最多只能有一个public类 且 文件名必须和public类名一致。
    如果文件中有多个类,文件名与public类名一致。
    如果文件中有多个类 且 无public类,文件名可以是任意类名。
    
  • 类名

    首字母大写且驼峰式命名,例如:Hello、UserInfo、PersonApplication
    
  • 类修饰符:public、default(不写)

  • 类中成员修饰符:public、private、protected、default(不写)

  • 静态成员,无序实例化就可以指定调用。

    class MyTest{
    
        public void f1(){
            System.out.println("f1");
        }
    
        public static void f2(){
            System.out.println("f2");
        }
    }
    
    public class Hello {
    
        public static void main(String[] args) {
            MyTest.f2();
            
            //1.实例化
            MyTest obj = new MyTest();
            // 2.对象调用
            obj.f1();
    
        }
    }
    
    class Person{
        public static void f1(){
            // 静态方法
            System.out.println("我是F1函数");
        }
    }
    
    public class Hello {
        public static void main(String[] args) {
            Person.f1();
        }
    }
    
    class Person {
        public void f2() {
            // 实例方法
            System.out.println("我是F1函数");
        }
    }
    
    public class Hello {
        public static void main(String[] args) {
            // 实例化对象  obj = Person();
            Person obj = new Person();
    
            // 对象调用f2
            obj.f2();
        }
    }
    
  • void表示方法没有返回值

    class MyTest{
    
        public int f1(){
            System.out.println("f1");
    
            return 123;
        }
    
        public static String f2(){
            System.out.println("f2");
            return "哈哈哈";
        }
    }
    
    public class Hello {
    
        public static void main(String[] args) {
    
            MyTest obj = new MyTest();
            int v1 = obj.f1();
    
            String v2 = MyTest.f2();
        }
    }
    
    
  • 参数

    class MyTest {
    
        public int f1(int a1, int a2) {
            int result = a1 + a2;
            return result;
        }
    
    }
    
    public class Hello {
    
        public static void main(String[] args) {
            MyTest obj = new MyTest();
            int v1 = obj.f1(1, 2);
        }
    }
    

补充:

Python 官方源代码不也有java这样写的么?

def func(a1,a2):
	return a1 + a2

# 建议
def foo(a1: str a2:int) -> int
	return 1

foo(11,22)

2.3.1 注释

/**
 * 对这个类进行注释
 */
public class Hello {

    /**
     * 这个方法是干嘛....
     * @param v1 大小
     * @param v2 尺寸
     * @return 返回一个xxx
     */
    public static String getSign(int v1, String v2) {
        return "哈哈哈";
    }

    public static void main(String[] args) {
        // 单行注释 # 
        // int age = 18;

        /* 多行注释 """sdfafd"""
        String name = "武沛齐";
        int size = 18;
         */
    }
}

注意:JavaScript

2.3.2 变量和常量

public class Hello {

    public static void main(String[] args) {
        String name = "武沛齐";
        name = "alex";

        int age = 19;
        age = 20;

        final int size = 18;
    }
}
v1 = [111,22]
v2 = 345

2.3.3 输入和输出

import java.util.Scanner;

public class Hello {

    public static void main(String[] args) {
        // 输入
        Scanner input = new Scanner(System.in);
        String text = input.nextLine();

        // 输出
        System.out.println(text);
        // System.out.print(text);
    }
}
import java.util.Scanner;

public class Hello {

    public static void main(String[] args) {
        // 输出
        System.out.print("请输入:");

        // 输入
        Scanner input = new Scanner(System.in);
        String text = input.nextLine();

        // 输出
        System.out.println(text);
    }
}

2.3.4 条件语句

import java.util.Scanner;

public class Hello {

    public static void main(String[] args) {
        int age = 19;

        if (age < 18) {
            System.out.println("少年");
        } else if (age < 40) {
            System.out.println("大叔");
        } else {
            System.out.println("老汉");
        }

    }
}
public class Hello {

    public static void main(String[] args) {
        int score = 19;

        switch (score) {
            case 10:
                System.out.println("xxx");
                System.out.println("xxx");
                System.out.println("xxx");
                break;
            case 20:
                System.out.println("xxx");
                System.out.println("xxx");
                System.out.println("xxx");
                break;
            default:
                System.out.println("xxx");
                break;
        }

    }
}

2.3.5 循环语句

while循环

public class Hello {

    public static void main(String[] args) {
        
        int count = 0;
        while (count < 3) {
            System.out.println("执行中...");
            count += 1;
        }
    }
}

do while循环(至少执行1次)

public class Hello {
    public static void main(String[] args) {
        
        int count = 0;
        do {
            System.out.println("执行中...");
            count += 1;
        } while (count < 3);
        
    }
}

for循环

public class Hello {

    public static void main(String[] args) {
        
        for (int i = 0; i < 10; i++) {
            System.out.println("哈哈哈");
        }
        
    }
}
public class Hello {

    public static void main(String[] args) {        
        String[] nameList = {"修仙", "肖峰", "麻子", "十分"};
        // nameList.length   4
        // nameList[0]

        for (int idx = 0; idx < nameList.length; idx++) {
            String ele = nameList[idx];
            System.out.println(ele);
        }
    }
}

注意:也支持break/continue。

2.4 数据类型

2.4.1 整数类型

  • byte,字节 【1字节】表示范围:-128 ~ 127 即:-2^7 ~ 2^7 -1
  • short,短整型 【2字节】表示范围:-32768 ~ 32767
  • int,整型 【4字节】表示范围:-2147483648 ~ 2147483647
  • long,长整型 【8字节】表示范围:-9223372036854775808 ~ 9223372036854775807
public class Hello {

    public static void main(String[] args) {
        byte v1 = 32;
        short v2 = 10000;
        int v3 = 22221331;
        long v4 = 554534353424L;
    }
}

提醒:逆向时有一些字符串是通过字节数组来表示(UTF-8编码)

v1 = "武沛齐"
v2 = [230, 173, 166, 230, 178, 155, 233, 189, 144]

import java.util.Arrays;

public class Hello {

    public static void main(String[] args) {
        // 1.字节数组(转换为字符串) [字节,字节,字节]
        byte[] dataList = {97, 105, 100, 61, 50, 52, 54, 51, 56, 55, 53, 55, 49, 38, 97, 117, 116, 111, 95, 112, 108, 97, 121, 61, 48, 38, 99, 105, 100, 61, 50, 56, 57, 48, 48, 56, 52, 52, 49, 38, 100, 105, 100, 61, 75, 82, 69, 104, 69, 83, 77, 85, 74, 104, 56, 116, 70, 67, 69, 86, 97, 82, 86, 112, 69, 50, 116, 97, 80, 81, 107, 55, 87, 67, 104, 67, 74, 103, 38, 101, 112, 105, 100, 61, 48, 38, 102, 116, 105, 109, 101, 61, 49, 54, 50, 55, 49, 48, 48, 57, 51, 55, 38, 108, 118, 61, 48, 38, 109, 105, 100, 61, 48, 38, 112, 97, 114, 116, 61, 49, 38, 115, 105, 100, 61, 48, 38, 115, 116, 105, 109, 101, 61, 49, 54, 50, 55, 49, 48, 52, 51, 55, 50, 38, 115, 117, 98, 95, 116, 121, 112, 101, 61, 48, 38, 116, 121, 112, 101, 61, 51};
        
        String dataString = new String(dataList);
        System.out.println("字符串是:" + dataString);

        // 2.字符串->字节数组
        try {
            // Python中的  name.encode("gbk")
            String name = "武沛齐";
            byte[] v1 = name.getBytes("GBK");
            System.out.println(Arrays.toString(v1)); // [-50, -28, -59, -26, -58, -21]
            
            // Python中的  name.encode("utf-8")
            byte[] v2 = name.getBytes("UTF-8");
            System.out.println(Arrays.toString(v2)); // [-26, -83, -90, -26, -78, -101, -23, -67, -112]
        } catch (Exception e) {

        }
    }
}

image-20220127173504514

需求来了:某个app逆向,在Java代码中得到一个字节数组 [-50,-28,-59,-26,-58,-21],请通过Python代码将这个字节数组转换成字符串?

  • 在Java中的字节范围:-128127;Python中字节的范围:0255。

      Java  0  1   2  3  4 .. 127 -128 -127 -126    -3  -2  -1     
    Python  0  1   2  3  4 .. 127  128  129  130 ...253 254 255
    
      java, 有符号:-128~127
    python,无符号:0~255
    
    byte_list = [-50,-28,-59,-26,-58,-21]
    
  • 让数字转化弄成字节并拼接起来 bytearray

# Python脚本,方便你们以后使用。
byte_list = [-50, -28, -59, -26, -58, -21]

bs = bytearray()  # python字节数组
for item in byte_list:
    if item < 0:
        item = item + 256
    bs.append(item)

str_data = bs.decode('gbk')  # data = bytes(bs)
print(str_data)
data_list = [-26, -83, -90, -26, -78, -101, -23, -67, -112]

num_list = bytearray()
for i in data_list:
    if i < 0:
        i = i + 256
    num_list.append(i)

text = num_list.decode('utf-8')
print(text)

2.4.2 字符

char v1 = 'x';
char v2 = '武';

String = "武沛齐";

注意:字符串是由多个字符串组成。

2.4.3 字符串

定义字符串

import java.io.UnsupportedEncodingException;

public class Hello {

    public static void main(String[] args) throws UnsupportedEncodingException {
        String v1 = "武沛齐";
        String v2 = new String("武沛齐");

        String v4 = new String(new byte[]{-26, -83, -90, -26, -78, -101, -23, -67, -112});
        String v5 = new String(new byte[]{-50, -28, -59, -26, -58, -21}, "GBK");
        
        String v6 = new String(  new char[]{'武', '沛', '齐'}   ) ;
    }
}

字符串中的方法:

public class Hello {

    public static void main(String[] args) {
        String origin = "alex是个大DB";

        char v1 = origin.charAt(5); // 指定字符
        int len = origin.length();  // 长度
        for (int i = 0; i < len; i++) {
            char item = origin.charAt(i);
        }

        String v2 = origin.trim(); // 去除空白
        String v3 = origin.toLowerCase(); // 小写
        String v4 = origin.toUpperCase(); // 大写
        String[] v5 = origin.split("是"); // 分割
        String v6 = origin.replace("D", "S"); // 替换
        String v7 = origin.substring(2, 6);  // 子字符串=切片 [2:6]
        boolean v8 = origin.equals("alex是个大SB"); // "alex是个大DB" "alex是个大SB"
        
        boolean v9 = origin.contains("el");
        boolean v10 = origin.startsWith("a");
        String v11 = origin.concat("哈哈哈");
    }
}
name = 'alex'
if name == 'sb':
    pass

字符串拼接

import java.io.UnsupportedEncodingException;

public class Hello {

    public static void main(String[] args) {
        // "name=alex&age=18"
        StringBuilder sb = new StringBuilder();  // StringBuffer线程安全
        sb.append("name");
        sb.append("=");
        sb.append("alex");
        sb.append("&");
        sb.append("age");
        sb.append("=");
        sb.append("18");
        
        String dataString = sb.toString();
        
        System.out.println(dataString);
    }
}
data = []
data.append("name")
data.append("=")
data.append("18")
data_string = "".join(data)

image-20220127174147151

image-20220127173632438

image-20220127173906405

2.4.4 数组

存放固定长度的元素。

  • 容器
  • 固定长度
  • 特定类型
import java.util.Arrays;

public class Hello {

    public static void main(String[] args) {
        // [123,1,999]
        int[] numArray = new int[3];
        numArray[0] = 123;
        numArray[1] = 1;
        numArray[2] = 99;
        
        System.out.println(Arrays.toString(numArray));

        String[] names = new String[]{"武沛齐", "alex", "eric"};
        System.out.println(Arrays.toString(names));
        

        String[] nameArray = {"武沛齐", "alex", "eric"};
        System.out.println(Arrays.toString(nameArray));

        // nameArray[0]
        // nameArray.length
        for (int idx = 0; idx < nameArray.length; idx++) {
            String item = nameArray[idx];
        }

    }
}

注意:数组一旦创建个数就不可调整。

2.4.5 关于Object

  • 在Python中每个类都默认继承Object类(所有的类都是Object的子类)。

  • 在Java所有的类都是默认继承Object类。

    int v1 = 123;
    String name = "武沛齐";
    

    用基类可以泛指他的子类的类型。

import sun.lwawt.macosx.CSystemTray;

import java.util.Arrays;

public class Hello {

    public static void main(String[] args) {
        // String v1 = "wupeiqi";
        Object v1 = new String("wupeiqi");
        System.out.println(v1);
        System.out.println(v1.getClass());

        Object v2 = 123;
        System.out.println(v2);
        System.out.println(v2.getClass());
    }
}
import sun.lwawt.macosx.CSystemTray;

import java.util.Arrays;

public class Hello {

    public static void main(String[] args) {
        // 声明数组,数组中元素必须int类型;
        int[] v1 = new int[3];

        // 声明数组,数组中元素必须String类型;
        String[] v2 = new String[3];

        // 声明数组,数组中可以是必须int/String类型;
        Object[] v3 = new Object[3];
        v3[0] = 123;
        v3[1] = "wupeiqi";

    }
}

所以,如果以后想要声明的数组中想要是混合类型,就可以用Object来实现。

import java.util.Arrays;

public class Hello {

    public static void main(String[] args) {
        // v1是指上字符串对象;String
        String v1 = new String("wupeiqi");
        String res = v1.toUpperCase();
        System.out.println(res);

        // v2本质是字符串对象;Object
        Object v2 = new String("wupeiqi");
        String data = (String)v2;
    }
}
import java.util.Arrays;

public class Hello {

    public static void func(Object v1) {
        // System.out.println(v1);
        // System.out.println(v1.getClass());
        if (v1 instanceof Integer) {
            System.out.println("整型");
        } else if (v1 instanceof String) {
            System.out.println("字符串类型");
        } else {
            System.out.println("未知类型");
        }
    }

    public static void main(String[] args) {
        func(123);
        func("123");
    }
}
  • Java中所有的类都继承Object,Object代指所有的类型。
  • 自己创建关系
    image-20220127224643681
ArrayList v1 = new ArrayList();
LinkedList v2 = new LinkedList();
List v1 = new ArrayList();
List v2 = new LinkedList();
Object v1 = new ArrayList();
Object v2 = new LinkedList();

2.5 常见数据类型

2.5.1 List系列

类似于Python中的列表。

List是一个接口,接口下面有两个常见的类型(目的是可以存放动态的多个数据)

  • ArrayList,连续的内存地址的存储(内部自动扩容)。 -> Python列表的特点
  • LinkedList,底层基于链表实现(自行车链条)。 -> Python列表的特点
ArrayList v1 = new ArrayList();
v1.add("武沛齐");
v1.add("麻子");
LinkedList v1 = new LinkedList();
v1.add("武沛齐");
v1.add("麻子");

Java中接口,是用来约束实现他的类,约束他里面的成员必须有xx。

interface List{
    public void add(Object data);   // 接口中的方法,不写具体的实现,只用于约束。
}

// 类ArrayList实现了接口List,此时这个类就必须有一个add方法。
class ArrayList implements List{
    public void add(Object data){
     	// 将数据data按照连续存储的方法放在内存。
        // ..
    }
}

// 类LinkedList实现了接口List,此时这个类就必须有一个add方法。
class LinkedList implements List{
    public void add(Object data){
     	// 将数据data按照链表的形式存储
        // ..
    }
}
List v1 = new ArrayList();
v1.add("武沛齐");
v1.add("麻子");
List v1 = new LinkedList();
v1.add("武沛齐");
v1.add("麻子");

ArrayList示例:

import java.util.ArrayList;
import java.util.Arrays;

public class Hello {

    public static void main(String[] args) {
		
        // ArrayList,默认内部存放的是混合数据类型。
        
        // ArrayList<String> data = new ArrayList<String>();
        // ArrayList<Object> data = new ArrayList<Object>();
        
        ArrayList data = new ArrayList();
        data.add("武沛齐");
        data.add("alex");
        data.add(666);
        data.add("tony");
        
        
        String value = data.get(1);
        // String value = (String) data.get(1);
        
        
        Object temp = data.get(1);
        String value = (String) temp; // 转化可转换的数据
            
        System.out.println(value);

        int xo = (int) data.get(2);
        System.out.println(xo);

        data.set(0, "哈哈哈哈");
        System.out.println(data);

        data.remove("eric");
        data.remove(0);
        System.out.println(data);

        int size = data.size();
        System.out.println(size);

        boolean exists = data.contains("武沛齐");
        System.out.println(exists);


        for (Object item : data) {
            System.out.println(item);
        }

        for (int i = 0; i < data.size(); i++) {
            Object item = data.get(i);
            System.out.println(item);
        }
    }
}

LinkedList示例:

import java.util.LinkedList;

public class Hello {

    public static void main(String[] args) {
        LinkedList<Integer> v1 = new LinkedList<Integer>();
        v1.push(11);
        v1.push(22);

        LinkedList<Object> v2 = new LinkedList<Object>();
        v2.push("有阪深雪");
        v2.push("大桥未久");
        v2.push(666);
        v2.push(123);

        //v2.remove(1);
        //v2.remove("路飞");

        v2.set(2, "苍老师");
        v2.push("哈哈哈");
        // v2.addFirst(11);


        for (int i = 0; i < v2.size(); i++) {
            Object item = v2.get(i);
            System.out.println(item);
        }

        for (Object item : v2) {
            System.out.println(item);
        }
    }
}

关于迭代器:

import java.util.*;

public class Hello {

    public static void main(String[] args) {

        ArrayList s1 = new ArrayList();
        s1.add("P站");
        s1.add("B站");
        s1.add("A站");


        Iterator it = s1.iterator(); // 迭代器
        while (it.hasNext()) {
            String item = (String) it.next();
            System.out.println(item);
        }
    }
}

image-20220208160404756

2.5.2 Set系列

Set是一个接口,常见实现这个接口的有两个类,用于实现不重复的多元素集合。

  • HashSet,去重,无序。
  • TreeSet,去重,内部默认排序(ascii、unicode)【不同的数据类型,无法进行比较】。
import java.util.*;

public class Hello {

    public static void main(String[] args) {
        // HashSet s1 = new HashSet();
        // Set s1 = new HashSet();
        // HashSet<String> s1 = new HashSet<String>();
        HashSet s1 = new HashSet();
        s1.add("P站");
        s1.add("B站");
        s1.add("A站");
        s1.add("P站");
        s1.add(666);
        System.out.println(s1); // [B站, A站, P站,666]
		
        // s2 = {"东京热","东北热","南京热"}
        HashSet s2 = new HashSet(){
            {
                add("东京热");
                add("东北热");
                add("南京热");
            }
        };
        System.out.println(s2);



        // Set s2 = new TreeSet();
        // TreeSet<String> s2 = new TreeSet<String>();
        TreeSet s3 = new TreeSet();
        s3.add("P站");
        s3.add("B站");
        s3.add("A站");
        s3.add("P站");
        // s3.add(666); //不可以

        System.out.println(s3); // [B站, A站, P站]

        TreeSet s4 = new TreeSet(){
            {
                add("P站");
                add("B站");
                add("A站");
                add("P站");
            }
        };
        System.out.println(s4); // [B站, A站, P站]

    }
}

关于交并差:

import java.util.*;

public class Hello {

    public static void main(String[] args) {
        // Set s1 = new HashSet();
        HashSet s1 = new HashSet();
        s1.add("P站");
        s1.add("B站");
        s1.add("A站");
        s1.remove("P站");
        System.out.println(s1); // [B站, A站, P站]

        boolean exists = s1.contains("B站");
        System.out.println(exists);

        HashSet s2 = new HashSet();
        s2.add(123);
        s2.add(456);

        HashSet v1 = new HashSet(); // 空  -> [B站, A站, P站]
        v1.addAll(s1);
        v1.retainAll(s2); // 交集 & 
        System.out.println(v1);


        HashSet v2 = new HashSet();
        v2.addAll(s1);
        v2.addAll(s2); // 并集 |
        System.out.println(v2);

        HashSet v3 = new HashSet();
        v3.addAll(s1);
        v3.removeAll(s2); // 差集 s1 - s2
        System.out.println(v3);


        HashSet v4 = new HashSet();
        v4.addAll(s2);
        v4.removeAll(s1); // 差集 s2 - s1
        System.out.println(v4);
    }
}

关于循环获取:

import java.util.*;

public class Hello {

    public static void main(String[] args) {

        TreeSet s1 = new TreeSet();
        s1.add("P站");
        s1.add("B站");
        s1.add("A站");

        for (Object item : s1) {
            System.out.println(item);
        }
    }
}

关于迭代器:

import java.util.*;

public class Hello {

    public static void main(String[] args) {

        TreeSet s1 = new TreeSet();
        s1.add("P站");
        s1.add("B站");
        s1.add("A站");


        Iterator it = s1.iterator();
        while (it.hasNext()) {
            String item = (String) it.next();
            System.out.println(item);
        }

    }
}

image-20220208160211442

2.5.3 Map系列

Map是一个接口,常见实现这个接口的有两个类,用于存储键值对。

  • HashMap,无序。

  • TreeMap,默认根据key排序。(常用)

    在Python中需要自己处理key排序的问题。
    v4 = {
    	"aid":123,
    	"xx":999,
    	"wid":888
    }
    
    # 1.根据key进行排序
    # data = ["{}={}".format(key,v4[key])  for key in sorted(v4.keys())]
    # 2.再进行拼接
    # result = "&".join(data)
    
    result = "&".join(["{}={}".format(key,v4[key])  for key in sorted(v4.keys())])
    
import java.util.*;

public class Hello {

    public static void main(String[] args) {
        HashMap h1 = new HashMap();
        h1.put("name","alex");
        h1.put("age",18);
        h1.put("hobby","男");
        System.out.println(h1); // {gender=男, name=alex, age=18}

        HashMap<String,String> h2 = new HashMap<String,String>();
        h2.put("name","alex");
        h2.put("age","18");
        h2.put("hobby","男");
        System.out.println(h2); // {gender=男, name=alex, age=18}


        HashMap<String,String> h3 = new HashMap<String,String>(){
            {
                put("name","alex");
                put("age","18");
                put("hobby","男");
            }
        };
        System.out.println(h3); // {gender=男, name=alex, age=18}
    }
}
import java.util.*;

public class Hello {

    public static void main(String[] args) {
        TreeMap h1 = new TreeMap(); // 改为了TreeMap
        h1.put("name","alex");
        h1.put("age",18);
        h1.put("hobby","男");
        System.out.println(h1); // {age=18, hobby=男, name=alex}

        TreeMap<String,String> h2 = new TreeMap<String,String>();
        h2.put("name","alex");
        h2.put("age","18");
        h2.put("hobby","男");
        System.out.println(h2); // {age=18, hobby=男, name=alex}


        TreeMap<String,String> h3 = new TreeMap<String,String>(){
            {
                put("name","alex");
                put("age","18");
                put("hobby","男");
            }
        };
        System.out.println(h3); // {age=18, hobby=男, name=alex}


        Map h4 = new TreeMap();
        h4.put("name","alex");
        h4.put("age",18);
        h4.put("hobby","男");
        System.out.println(h4); // {age=18, hobby=男, name=alex}
    }
}

常见操作:

import java.util.*;

public class Hello {

    public static void main(String[] args) {
        TreeMap h1 = new TreeMap(); // 改为了TreeMap
        h1.put("name", "alex");
        h1.put("age", "18");
        h1.put("hobby", "男");
        h1.put("hobby", "女人");

        h1.remove("age");
        int size = h1.size();

        Object value = h1.get("name"); // 不存在,返回null
        System.out.println(value);

        boolean existsKey = h1.containsKey("age");
        boolean existsValue = h1.containsValue("alex");

        h1.replace("name", "李杰");
        System.out.println(h1);


        // 循环: 示例1
        // {  ("name", "alex"),("age", "18"),  }
        Set<Map.Entry<String, String>> s1 = h1.entrySet();
        Iterator it1 = s1.iterator();
        while (it1.hasNext()) {
            // ("name", "alex")
            Map.Entry<String, String> entry = (Map.Entry<String, String>) it1.next();
            String k = (String) entry.getKey();
            String v = (String) entry.getValue();
        }

        // 循环: 示例2
        Set s2 = h1.entrySet();
        Iterator it2 = s2.iterator();
        while (it2.hasNext()) {
            Map.Entry entry = (Map.Entry) it2.next();
            String k = (String) entry.getKey();
            String v = (String) entry.getValue();
        }

        // 循环: 示例3
        TreeMap<String, String> h2 = new TreeMap<String, String>(); // 改为了TreeMap
        h2.put("name", "alex");
        h2.put("age", "18");
        for (Map.Entry<String, String> entry : h2.entrySet()) {
            String k = entry.getKey();
            String v = entry.getValue();
        }

        // 循环: 示例4
        TreeMap h3 = new TreeMap(); // 改为了TreeMap
        h3.put("name", "alex");
        h3.put("age", 18);
        
        for (Object entry : h3.entrySet()) {
            Map.Entry<String, Object> entryMap = (Map.Entry<String, Object>) entry;
            String k = entryMap.getKey();
            Object v = entryMap.getValue(); // 18   "alex"
            
            if (v instanceof Integer) {
                System.out.println("数字:" + Integer.toString((Integer) v));
            } else if (v instanceof String) {
                System.out.println("字符串:" + (String) v);
            } else {
                System.out.println("未知类型:" + v.toString());
            }
        }
    }
}

image-20220208151234641

image-20210928193550689

image-20210928193623922

day05 java基础

今日概要:

  • 面向对象 相关(重要)

  • 常见加密

1.面向对象相关

  • Python,函数式+面向对象。
  • Java,面向对象。

1.1 类和对象

image-20230207201949281

class Person {
    // 实例变量
    public String name;
    public Integer age;

    // 构造方法1
    public Person() {
        this.name = "Eric";
        this.age = 99999;
    }
}

Person obj = new Person();
class Person:
    
    # 初始化方法,  1. __new__方法,构造方法创建空对象 2.__init___方法
    def __init__(self):
        self.name = "eric"
        self.age = 999999
        
obj = Person()
class Person {

    // 实例变量
    public String name;
    public Integer age;
    public String email;

    // 构造方法1
    public Person() {
        this.name = "Eric";
        this.age = 99999;
    }

    // 构造方法2
    public Person(String name, Integer age) {
        this.name = name;
        this.age = age;
        this.email = "xxx@live.com";
    }

    // 构造方法3
    public Person(String name, String email) {
        this.name = name;
        this.age = 83;
        this.email = email;
    }
}

Person obj1 = new Person("wupeiqi",11);
Person obj2 = new Person();
class Person {

    // 实例变量
    public String name;
    public Integer age;
    public String email;

    // 构造方法1
    public Person() {
        this.name = "Eric";
        this.age = 99999;
    }

    // 构造方法2
    public Person(String name, Integer age) {
        this.name = name;
        this.age = age;
        this.email = "xxx@live.com";
    }

    // 构造方法3
    public Person(String name, String email) {
        this.name = name;
        this.age = 83;
        this.email = email;
    }
	
    // 定义方法(重载)
    public void doSomething() {
        System.out.println(this.name);
    }

	// 定义方法(重载)
    public void doSomething(String prev) {
        String text = String.format("%s-%s", prev, this.name);
        System.out.println(text);
    }
    
}

public class Hello {

    public static void main(String[] args) {
		
        // 实例化对象时,体现的主要是封装。
        Person p1 = new Person();
        Person p2 = new Person("alex", 73);
        Person p3 = new Person("tony", "alex@sb.com");

        p1.doSomething();
        p1.doSomething("你好呀,");

        p2.doSomething();
        p2.doSomething("你好呀,");
        
        p3.doSomething();
        p3.doSomething("你好呀,");
    }
}
var MessageDigest = Java.use("java.security.MessageDigest");
MessageDigest.update.overload("[B").implementation = function (data) {
    var ByteString = Java.use("com.android.okhttp.okio.ByteString");
    console.log(ByteString.of(data).utf8(), '\n' );
    return this.update(data);
}

1.2 静态成员

class Foo:
    v1 = "武沛齐"             # 静态变量(属于类,与对象无关)
    
    def __init__(self):
        self.name = "alex"   # 实例变量,属于对象
        
print(Foo.v1)

# 1.创建空的区域
# 2.自动执行构造方法 __init__
obj = Foo()
print(obj.name)
print(obj.v1)

image-20220208221733720

class Person {
    // 静态变量
    public static String city = "北京";
    
    // 实例变量
    public String name;
    public Integer age;

    // 构造方法1
    public Person() {
        this.name = "Eric";
        this.age = 99999;
    }
    
    // 绑定方法
    public void showInfo(){
        System.out.println("哈哈哈哈");
    }
    
    // 静态方法
    public static void showData(){
        System.out.println("哈哈哈哈");
    }
}

Person.city;
Person.showData();

Person obj = new Person();
obj.name;
obj.age;
obj.showInfo();

本质:静态属于类;非静态属于对象。

1.3 继承

Java中的继承,只支持单继承,不支持多继承,但支持实现多个接口。

class Base{
    ...
}

class Foo{
    ...
}

class Son(Base){
    
}
interface Base{
    public void add();
}

interface Foo{
	public void plus();
}

class Son implements Base,Foo {
    public void add(){
        
    }
    public void plus(){
        
    }
}

Python中之和多继承。

class Foo(Base,Bar):
    pass

class Foo(IBase,IBar):
    pass
class Base {
    public String email;

    public Base(String email) {
        this.email = email;
    }

    public String getSubInfo() {
        return String.format("%s", this.email);
    }
}


// Base obj1 = new Base("xx");
// obj1.email; // "xx"
// obj1.getSubInfo();

class Person extends Base {

    public String name;
    public Integer age;

    public Person(String name, Integer age, String email) {
        super(email);// 执行父类的构造方法
        
        this.name = name;
        this.age = age;
    }

    public String getInfo(String v1) {
        return String.format("%s-%d-%s", this.name, this.age, this.email);
    }
}

// obj2 ==> email="xxx@live.com"  name="wupeiqi"  age=19
Person obj2 = new Person("wupeiqi",19,"xxx@live.com");

// obj2.name;
// obj2.age;
// obj2.email;

// obj2.getInfo("xxx");
// obj2.getSubInfo();

用父类泛指所有的子类。

class Base {
    
}

class Person extends Base {

}

Person v1 = new Person(); // v1是Person类型的对象
Base v2 = new Person();  //  v2是Person类型的对象
class Base {
    public void show() {
		System.out.println("111");
    }
}

class Person extends Base {
	public void show() {
		System.out.println("222");
    }
}

Person v1 = new Person();
v1.show(); // 222

Base v2 = new Base();
v2.show(); // 111

Base v3 = new Person();
v3.show(); // 222
class Base {
    public String email;

    public Base(String email) {
        this.email = email;
    }

    public void getSubInfo() {
		System.out.println("111");
    }
}

// Person类继承Base类
class Person extends Base {

    public String name;

    public Person(String name, Integer age, String email) {
        super(email);// 执行父类的构造方法
        this.name = name;
    }
	
     public void getSubInfo() {
		System.out.println("222");
    }
}

public class Hello {
	
    public static void handler(Base v1){
        v1.getSubInfo();
    }
    
    // 主函数
    public static void main(String[] args) {
        Person obj1 = new Person("wupeiqi",19,"xxx@live.com");
		handler(obj1); // 222

        Base obj2 = new Base("xxx@live.com");
        handler(obj2); // 111

        Base obj3 = new Person("wupeiqi",19,"xxx@live.com");
        handler(obj3); // 222
    }
    
}

1.4 接口

接口:

  • 约束,实现他的类。
  • 泛指 实现 他了类。
interface IMessage {
    public void send();
}

// Wechat类"实现"了Imessage接口
class Wechat implements IMessage {
    public void send() {
        System.out.println("发送微信");
    }
}

class DingDing implements IMessage {
    public void send() {
        System.out.println("发送钉钉");
    }
}

class Sms implements IMessage {
    public void send() {
        System.out.println("发送短信");
    }
}

Wechat v1 = new Wechat();
IMessage v2 = new Wechat();
public class Hello {
    
    // 多态 -> 多种形态 IMessage
	public static void handler(IMessage v1){
        v1.send();
    }
    
    // 主函数
    public static void main(String[] args) {
       Sms v1 = new Sms();
       handler(v1);
    }
}

在Java中:不支持同时继承多个类;支持实现多个接口。

interface IPerson {
    public void f1();

    public void f1(int age);

    public void f2(String info);
}

interface IUser {
    public String f3(int num);
}

class Base {
    public String name;
    public Integer age;
    public String email;

    public Base(String name, Integer age, String email) {
        this.name = name;
        this.age = age;
        this.email = email;
    }

    public String getSubInfo() {
        return String.format("%s", this.email);
    }
}

class Person extends Base implements IUser, IPerson {

    public Person(String name, Integer age, String email) {
        super(name, age, email);
    }

    public String getInfo() {
        return String.format("%s-%d-%s", this.name, this.age, this.email);
    }


    public void f1() {
        System.out.println("F1,无参数");
    }

    public void f1(int age) {
        System.out.println("F1,age参数");
    }

    public void f2(String info) {
        System.out.println("F2");
    }

    public String f3(int num) {
        return "哈哈哈";
    }
}

public class Hello {

    public static void main(String[] args) {
        Person p = new Person("日天", 83, "ritian@live.com");
        p.f1();
    }
}

假设我现在在进行逆向,拿到apk,关于关键字去搜索:f2 ,定位到一个接口了。

interface IPerson {
    public void f1();

    public void f1(int age);

    public void f2(String info);
}

接下来,你就应该去看都有哪些类 实现了 IPerson 接口。

  • 只有1个类实现 IPerson。
  • 多类类实现 IPerson 接口,筛选到底是那个类?

1.5 抽象

// 抽象类
abstract class Base {

    // 抽象方法(约束子类中必须有这个方法)
    public abstract void play(String name);

    // 普通方法
    public void stop() {
        System.out.println("Stop");
    }
}

class Son extends Base{
    public void play(String name){
        // ...
    }
}

Son obj = new Son();
obj.stop();
obj.play();

Base obj1 = new Son();

注意:也可以泛指他的子类。

1.6 包

src
├── Hello.java
└── utils
    └── Helper.java
// hello.java
import utils.Helper;

public class Hello {

    public static void main(String[] args) {
        String data = Helper.getInfo();
        System.out.println(data);
    }
}

// helper.java
package utils;

public class Helper {
    public static String getInfo() {
        return "哈哈哈";
    }
}

类的修饰符:

  • public,公共(任何人都能调用包中的类)。
  • default,只能在当前包中被调用。

类成员修饰符:

  • public,公共,所有的只要有权限访问类,类中的成员都可以访问到。
  • private,私有,只允许自己类调用。
  • protected,同一个包 或 子类可以访问(即使没有在同一个包内,也可以访问父类中的受保护成员)。
  • default,只能在同一个包内访问。

目的:通过关键字让调用关系更加清晰(不过,很多项目不会用的那么专业)。

1.7 属性

class Person {

    private String name;

    public Person() {
        this.name = "eric";
    }


    public void setName(String data){
        this.name = data;
    }

    public String getName(){
        return this.name;
    }
}


Person obj = new Person();
obj.getName()
obj.setName("武沛齐")

-----------------------------------

class Person {
    private String name;

    public void setName(String data){
        this.name = data;
    }

    public String getName(){
        return this.name;
    }
}


Person obj = new Person();
obj.getName();

2.常见加密

2.1 隐藏字节

String salt = "xxssasdfasdfadsf";
String v4 = new String(new byte[]{-26, -83, -90, -26, -78, -101, -23, -67, -112});
  • 示例1:

    String v1 = new String(new byte[]{26, 83, 90, 26, 78, 101, 23, 67, 112});
    
    # 字节列表
    byte_list = [26, 83, 90, 26, 78, 101, 23, 67, 112]
    
    # 字节列表 -> python的字节数组
    bs = bytearray()
    for item in byte_list:
        bs.append(item)
        
    # python的字节数组 -> 编码 -> 字符串
    str_data = bs.decode('utf-8')
    print(str_data)
    
  • 示例2:

    String v4 = new String(new byte[]{-26, -83, -90, -26, -78, -101, -23, -67, -112});
    
    # java字节:有符号 -128 ~ 127
    # python:无符号  0 ~ 255
    
    byte_list = [-26, -83, -90, -26, -78, -101, -23, -67, -112]
    
    bs = bytearray()  # python字节数组
    for item in byte_list:
        if item < 0:
            item = item + 256
        bs.append(item)
    
    str_data = bs.decode('utf-8')  # data = bytes(bs)
    print(str_data)
    
注意事项:什么编码?(utf-8)
	String v4 = new String(new byte[]{-26, -83, -90, -26, -78, -101, -23, -67, -112});
# 类似于Java中的字节数组
data = "张三懵逼了"
data_bytes = data.encode('utf-8')


data_list = bytearray()
for item in data_bytes:
    data_list.append(item)

res = data_list.decode('utf-8')
print(res)

提醒:MD5加密盐、AES加密key、iv;

2.2 uuid

image-20211012191034675

import java.util.UUID;

public class Hello {
    public static void main(String[] args){
        String uid = UUID.randomUUID().toString();
        System.out.println(uid);
    }
}
import uuid

uid = str(uuid.uuid4())
print(uid)

2.3 随机值

image-20211012190908863

import java.math.BigInteger;
import java.security.SecureRandom;

public class Hello {

    public static void main(String[] args) {
        // 随机生成80位,10个字节
        BigInteger v4 = new BigInteger(80, new SecureRandom());
        // 让字节以16进制展示
        String res = v4.toString(16);
        System.out.println(res);

    }
}
import random

data = random.randbytes(10)  # python3.9

ele_list = []
for item in data:
    ele = hex(item)[2:]
res = "".join(ele_list)
print(res)
data = "".join([ hex(item)[2:] for item in random.randbytes(10)])
import random

data = random.randbytes(10)  # pytho3.9  [199,112,88,10,232]

print(  [item for item in data]  )
print(  [hex(item)[2:] for item in data]  )
print(  [hex(item)[2:].rjust(2, "0") for item in data]   )


print(  "".join([hex(item)[2:].rjust(2, "0") for item in data])   )
import random

byte_list = [random.randint(0, 255) for i in range(10)]


print([item for item in byte_list])
print([hex(item)[2:] for item in byte_list])
print([hex(item)[2:].rjust(2, "0") for item in byte_list])

print("".join([hex(item)[2:].rjust(2, "0") for item in byte_list]))

小补充:十六进制

import random

data = random.randbytes(10)  # pytho3.9

ele_list = []
for item in data:
    ele = hex(item)[2:].rjust(2,"0")
res = "".join(ele_list)
print(res)
data = "".join([ hex(item)[2:].rjust(2,"0") for item in random.randbytes(10)])

注意:md5加密

  • Python中的md5加密: digest hexdigest
  • Java中的的md5加密:字节数组 -> 手动转换

2.4 时间戳

_ticket

image-20211012192006825

public class Hello {

    public static void main(String[] args) {
        String t1 = String.valueOf(System.currentTimeMillis() / 1000);
        String t2 = String.valueOf(System.currentTimeMillis());

        System.out.println(t1);
        System.out.println(t2);
    }
}
import time

v1 = int(time.time())
v2 = int(time.time()*1000)
v1 = str(int(time.time()))
v2 = str(int(time.time()*1000))
requests.post(
	url="?"
    json={
        "xx":123
    },
    headers={
        "ticket":121231   # 报错,一定是字符串类型
    }
)

2.5 十六进制的字符串

image-20211012191556212

在Java中字节是有符号:-128 ~ 127

# name_bytes = "武沛齐".encode('utf-8')
name_bytes = [10, -26, -83, -90, -26, -78, -101, -23, -67, -112]

data_list = []

for item in name_bytes:
    item = item & 0xff   # item<0时,让item+256
    ele = "%02x" % item
    data_list.append(ele)
    
print("".join(data_list))

2.6 md5加密

import hashlib

obj = hashlib.md5('yyy'.encode('utf-8'))
obj.update('xxxxx'.encode('utf-8'))

# java中没有这个功能。
v1 = obj.hexdigest()
print(v1) # fb0e22c79ac75679e9881e6ba183b354

v2 = obj.digest()
print(v2) # b'\xfb\x0e"\xc7\x9a\xc7Vy\xe9\x88\x1ek\xa1\x83\xb3T'

image-20211012192151809

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import java.util.Base64;

public class Hello {

    public static void main(String[] args) throws NoSuchAlgorithmException {
        String name = "武沛齐";
        
        MessageDigest instance = MessageDigest.getInstance("MD5");
        byte[] nameBytes = instance.digest(name.getBytes());
       
        // 十六进制展示
        StringBuilder sb = new StringBuilder();
        for(int i=0;i<nameBytes.length;i++){
            int val = nameBytes[i] & 255;  // 负数转换为正数
            if (val<16){
                sb.append("0");
            }
            sb.append(Integer.toHexString(val));
        }
        String hexData = sb.toString();
        System.out.println(hexData); // e6ada6e6b29be9bd90
    }
}
import hashlib

m = hashlib.md5()
m.update("武沛齐".encode("utf-8"))

v1 = m.digest()
print(v1) # b'\x175\x10\x12G$)\xd5-\x0c\r#\xd4h\x17='

v2 = m.hexdigest()
print(v2) # 17351012472429d52d0c0d23d468173d

关于加盐:

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import java.util.Base64;

public class Hello {

    public static void main(String[] args) throws NoSuchAlgorithmException {
        String name = "武沛齐";
        MessageDigest instance = MessageDigest.getInstance("MD5");
        instance.update("xxxxxx".getBytes());
        
        byte[] nameBytes = instance.digest(name.getBytes());
        
        System.out.println(Arrays.toString(nameBytes));

        String res = new String(nameBytes);
        System.out.println(res);

        // 十六进制展示
        StringBuilder sb = new StringBuilder();
        for(int i=0;i<nameBytes.length;i++){
            int val = nameBytes[i] & 255;  // 负数转换为正数
            if (val<16){
                sb.append("0");
            }
            sb.append(Integer.toHexString(val));
        }
        String hexData = sb.toString();
        System.out.println(hexData); // e6ada6e6b29be9bd90
    }
}
import hashlib

m = hashlib.md5("xxxxxx".encode('utf-8'))
m.update("武沛齐".encode("utf-8"))

v2 = m.hexdigest()
print(v2) # 17351012472429d52d0c0d23d468173d

2.7 sha-256加密

B站:x/report/andriod2,请求体

image-20211012191522515

image-20211012191556212

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import java.util.Base64;

public class Hello {

    public static void main(String[] args) throws NoSuchAlgorithmException {
        String name = "武沛齐";
        MessageDigest instance = MessageDigest.getInstance("SHA-256");
        byte[] nameBytes = instance.digest(name.getBytes());
        // System.out.println(Arrays.toString(nameBytes));

        // String res = new String(nameBytes);
        // System.out.println(res);

        // 十六进制展示
        StringBuilder sb = new StringBuilder();
        for(int i=0;i<nameBytes.length;i++){
            int val = nameBytes[i] & 255;  // 负数转换为正数
            if (val<16){
                sb.append("0");
            }
            sb.append(Integer.toHexString(val));
        }
        String hexData = sb.toString();
        System.out.println(hexData); // e6ada6e6b29be9bd90
    }
}
import hashlib

m = hashlib.sha256()
m.update("武沛齐".encode("utf-8"))

v2 = m.hexdigest()
print(v2)

2.8 AES加密

对称加密

  • key & iv ,明文加密。【app端】
  • key & iv ,解密。【API】
情况A: 请求体密文(抓包乱码)
情况B: sign,AES加密+base64编码

刷B站播放时,发送POST请求。

AES加密(请求体中的数据) -> 密文(JS央视频 key & iv & 加密)。

image-20211012192408372

image-20211012192555254

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import java.util.Base64;

public class Hello {

    public static void main(String[] args) throws Exception {
        String data = "武沛齐";
        String key = "fd6b639dbcff0c2a1b03b389ec763c4b";
        String iv = "77b07a672d57d64c";
		
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        
        // 加密
        byte[] raw = key.getBytes();
        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        IvParameterSpec ivSpec = new IvParameterSpec(iv.getBytes());
        
        
        
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, ivSpec);
        byte[] encrypted = cipher.doFinal(data.getBytes());
        
        // System.out.println(Arrays.toString(encrypted));
        
    }
}
# pip install pycryptodome
from Crypto.Cipher import AES
from Crypto.Util.Padding import pad

KEY = "fd6b639dbcff0c2a1b03b389ec763c4b"
IV = "77b07a672d57d64c"


def aes_encrypt(data_string):
    aes = AES.new(
        key=KEY.encode('utf-8'),
        mode=AES.MODE_CBC,
        iv=IV.encode('utf-8')
    )
    raw = pad(data_string.encode('utf-8'), 16)
    return aes.encrypt(raw)

data = aes_encrypt("武沛齐")
print(data)
print([ i for i in data])

2.9 base64编码

import java.util.Base64;

public class Hello {

    public static void main(String[] args) {
        String name = "武沛齐";
        // 编码
        Base64.Encoder encoder  = Base64.getEncoder();
        String res = encoder.encodeToString(name.getBytes());
        System.out.println(res); // "5q2m5rKb6b2Q"
		
        // 解码
        Base64.Decoder decoder  = Base64.getDecoder();
        byte[] origin = decoder.decode(res);
        String data = new String(origin);
        System.out.println(data); // 武沛齐

    }
}
import base64

name = "武沛齐"

res = base64.b64encode(name.encode('utf-8'))
print(res) # b'5q2m5rKb6b2Q'


data = base64.b64decode(res)
origin = data.decode('utf-8')
print(origin) # "武沛齐"


# 不同,换行符 + ==
posted @ 2023-04-09 19:24  凫弥  阅读(103)  评论(0编辑  收藏  举报