06.app中常见加密代码

// 某款app中，hook到一些字节数组--》转成字符串
String salt = "sign";
// 字符串转bytes格式数组
System.out.println(Arrays.toString(salt.getBytes()));

// [115, 105, 103, 110]
String v4 = new String(new byte[]{115, 105, 103, 110});
System.out.println(salt);
System.out.println(v4);


// [115, 105, 103, 110]-->python 转成 字符串
v1 = [115, 105, 103, 110]
def java_arr_to_python_str(v1):
    num_list = bytearray()
    for i in v1:
        if i < 0:
            i = i + 256
        num_list.append(i)
    return num_list.decode('utf-8')

// uuid 固定格式的不重复的随机字符串 65fe0c8e - ac3f - 4bcb - bb0b - 7afe60e1dc31
	-作用某个东西的id：唯一id
    -app端随机生成uuid带到后端
        
        
import java.util.UUID;

public class Hello {
    public static void main(String[] args){
        String uid = UUID.randomUUID().toString();
        System.out.println(uid);
    }
}
// 65fe0c8e-ac3f-4bcb-bb0b-7afe60e1dc31

// python 中uuid生成
import uuid
uid = str(uuid.uuid4())
print(uid)

# 随机生成80位,8位是一个字节，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);



# python 3.9
import random
data = random.randbytes(10)  # python3.9
ele_list = []
for item in data:
    ele = hex(item)[2:]
    ele_list.append(ele)
res = "".join(ele_list)
print(res)
# 或者
import random
data = "".join([hex(item)[2:] for item in random.randbytes(10)])
print(data)

String t1 = String.valueOf(System.currentTimeMillis() / 1000); // 秒级别
String t2 = String.valueOf(System.currentTimeMillis()); // 毫秒级别
System.out.println(t1);
System.out.println(t2);

String t1 = String.valueOf(System.currentTimeMillis() / 1000); // 秒级别
String t2 = String.valueOf(System.currentTimeMillis()); // 毫秒级别
System.out.println(t1);
System.out.println(t2);

s='pengyuyan'.encode('utf-8')
l=[]
for i in s:
    l.append(hex(i)[2:].rjust(2,'0')) # 转16进制，只去后两位，如果不足两位，补0
print(l)

# 123-->固定的 字符串---》加固定的盐， 666---


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

# java中没有这个功能,把每个字节转换成16进制
v1 = obj.hexdigest()
print(v1) # d3c0aaaf596e3299f695591f00fd75cb

v2 = obj.digest()
print(v2) # b'\xd3\xc0\xaa\xafYn2\x99\xf6\x95Y\x1f\x00\xfdu\xcb'

String name = "彭于晏";
// 编码
Base64.Encoder encoder  = Base64.getEncoder();
String res = encoder.encodeToString(name.getBytes());
System.out.println(res); //5b2t5LqO5pmP

// 解码
Base64.Decoder decoder  = Base64.getDecoder();
byte[] origin = decoder.decode(res);
String data = new String(origin);
System.out.println(data); // 彭于晏

import base64

name = "彭于晏"
res = base64.b64encode(name.encode('utf-8'))
print(res) # b'5b2t5LqO5pmP'

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