m3u8加密文件原理及下载脚本_#ext-x-key:method=aes-128

一、加密ts文件解密

#EXTM3U
#EXT-X-VERSION:3
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-ALLOW-CACHE:YES
#EXT-X-TARGETDURATION:13
#EXT-X-KEY:METHOD=AES-128,URI="https://j-island.net/movie/hls_key/s/857401e309d8a032c3bb18f4b09b8db2/?f=jj_20190401_hihijets_004",IV=0xaa3dcf6a7acb92ff4fb08d9b3b3d6f51
#EXTINF:12.078733,
https://j-island.stream2.johnnys-net.jp/j-island/jj_20190401_hihijets_004/jj_20190401_hihijets_00400000.ts
#EXTINF:9.009000,
https://j-island.stream2.johnnys-net.jp/j-island/jj_20190401_hihijets_004/jj_20190401_hihijets_00400001.ts
#EXTINF:9.009000,
https://j-island.stream2.johnnys-net.jp/j-island/jj_20190401_hihijets_004/jj_20190401_hihijets_00400002.ts
#EXTINF:12.012000,
https://j-island.stream2.johnnys-net.jp/j-island/jj_20190401_hihijets_004/jj_20190401_hihijets_00400003.ts
#EXTINF:9.009000,
https://j-island.stream2.johnnys-net.jp/j-island/jj_20190401_hihijets_004/jj_20190401_hihijets_00400004.ts
#EXTINF:2.002000,
https://j-island.stream2.johnnys-net.jp/j-island/jj_20190401_hihijets_004/jj_20190401_hihijets_00400005.ts
#EXT-X-ENDLIST

m3u8视频另一种下载方式 如上图中用ts链接直接下载下来的ts视频文件是加密的（为什么要下加密的？虽然加密但是下载速度快啊）。

#EXT-X-KEY 字段已经写明了加密方式是AES-128，key通过URI获取，IV也有。

#EXT-X-KEY:
METHOD=AES-128,
URI="https://j-island.net/movie/hls_key/s/857401e309d8a032c3bb18f4b09b8db2/?f=jj_20190401_hihijets_004",
IV=0xaa3dcf6a7acb92ff4fb08d9b3b3d6f51

那怎么解密呢？

1.复制URI地址到网页，你将秒速自动下载得到一个16字节文件 2.打开终端，打开该文件查看16进制：

• 打开二进制key

vi -b /路径/key文件

• 输入“ :%!xxd”再把二进制文件切换到16进制

00000000: 283d cc2d 3747 e965 0a81 ead3 1e04 fa8a  (=.-7G.e........

获取到key就是 283dcc2d3747e9650a81ead31e04fa8a 3.打开终端，转化

openssl aes-128-cbc -d -in /路径/media_0.ts -out /路径/media_decryptd_0.ts -nosalt -iv $iv -K $strkey

*media_0.ts* : 加密ts文件（无法播放） *media_decryptd_0.ts* : 解密后ts文件（可以直接播放） *$iv* : aa3dcf6a7acb92ff4fb08d9b3b3d6f51（#EXT-X-KEY字段中获取，注意去掉0x） *$strkey* : 283dcc2d3747e9650a81ead31e04fa8a（上一步获得）

例子：

openssl aes-128-cbc -d -in /Users/用户名/Downloads/001.ts -out /Users/用户名/Downloads/001_dec.ts -nosalt -iv aa3dcf6a7acb92ff4fb08d9b3b3d6f51 -K 283dcc2d3747e9650a81ead31e04fa8a

命令执行完秒速转化（也可能我文件特别短，都切成ts了，一般都不长吧…… 4.到对应路径下去，就能看到转化成功到ts视频了

二、案例

1、m3u8文件

通过连接：

https://XXXXXXX/video/20210713/48466f15b9094154a3dc405efd5b54fd/cloudv-transfer/555555552773r8qq5556n265646r92r4_e8f05058b8c14e679738b91d96fa6d60_0_3.m3u8?t=1652097774&k=a062691ead867c707b07b5c6caf87385&vid=9e74e191017a1000dd3e822700000000&r=a8aede38018010004b91ff8f00000000

下载文件内容如下
​
​

#EXTM3U
#EXT-X-VERSION:3
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-ALLOW-CACHE:YES
#EXT-X-TARGETDURATION:11
#EXT-X-KEY:METHOD=AES-128,URI="https://api.cloudv.haplat.net/vod/videoManage/getHlsKeyByVideoId?cid=882006&t=1652097774&k=a062691ead867c707b07b5c6caf87385&vid=9e74e191017a1000dd3e822700000000&r=a8aede38018010004b91ff8f00000000",IV=0x993181d25c49657b7b6bfeff30f13d8c
#EXTINF:1.200000,
a08a0c0364dc4000b46560e905564520_0000000.ts
#EXTINF:1.000000,
a08a0c0364dc4000b46560e905564520_0000001.ts

​

2、key值

https://api.cloudv.haplat.net/vod/videoManage/getHlsKeyByVideoId?cid=882006&t=1652097774&k=a062691ead867c707b07b5c6caf87385&vid=9e74e191017a1000dd3e822700000000&r=a8aede38018010004b91ff8f00000000

找到请求的返回值


​将字符串进行16进制编码

 

3 、下载ts文件

通过分析，ts下载网址为

https://xxxxxxx/video/20210713/48466f15b9094154a3dc405efd5b54fd/cloudv-transfer/a08a0c0364dc4000b46560e905564520_0000000.ts
​
构造ts的下载网址为https://xxxxxxx/video/20210713/48466f15b9094154a3dc405efd5b54fd/cloudv-transfer/ + m3u8文件中的数据

4、解码

下载的ts为加密后的，需要进行解码，采用openssl解码

openssl aes-128-cbc -d -in 0.ts -out 0_1.ts -nosalt -iv 993181d25c49657b7b6bfeff30f13d8c -K f370739f5a517a4724c677a73e156126

​5脚本：

#!C:\Python3.7
# -*- coding:utf-8 -*-
# coding=utf-8
import requests
import os
headers = {
    "User - Agent": "Mozilla / 5.0(Windows NT 10.0;WOW64) AppleWebKit / 537.36(KHTML, like Gecko) Chrome / 84.0.4147.105 Safari / 537.36"
    }
 
 
def download(baseurl,file_m3u8,path_in):
    url_list=[]
    with open(file_m3u8,"r") as f:
        for r in f.readlines():
            if ".ts" in r :
                url_list.append(r.replace("\n","").strip())
    # print(url_list)
 
    for r in url_list:
        url = baseurl+r
        filename=os.path.join(path_in,r.split("_")[1])
        # print(url,filename)
        try:
            re = requests.get(url=url,headers=headers)
        except Exception as e:
            print(e)
            pass
        with open(filename,"ab") as f:
            f.write(re.content)
            print("[*]download:"+filename)
 
 
def mergeFileToMP4(pathname):
    os.chdir(pathname)
    cmd = "copy /b *.ts new.tmp"
    os.system(cmd)
    os.system('del /Q *.ts')
    os.system('del /Q *.mp4')
    os.rename("new.tmp", "new.mp4")
    os.chdir('..')
    print("merge file is :",str(os.path.join(pathname,"new.mp4")))
 
def key_test(key):
    print(len(key))
    key_hex=""
    for c in key:
        tem=hex(ord(c))[2:]
        key_hex=key_hex+tem
    print(key_hex)
    return  key_hex
 
def decode_openssl(key,iv,path_in,path_out):
    for file in os.listdir(path_in):
        file_in=os.path.join(path_in,file)
        file_out = os.path.join(path_out,file)
        # print(file_in,file_out)
        cmd=f"openssl aes-128-cbc -d -in {file_in} -out {file_out} -nosalt -iv {iv} -K {key}"
        print(cmd)
        os.system(cmd)
 
def clear_ts(path):
    os.chdir(path)
    os.system("del /Q *.ts")
 
def main(baseurl,key,iv,file_m3u8):
    # print("main")
    basepath = os.path.split(file_m3u8)[0]
    basepath_in = os.path.join(basepath, "in")
    basepath_out = os.path.join(basepath, "out")
    if not os.path.exists(basepath_in):
        os.mkdir(basepath_in)
    if not os.path.exists(basepath_out):
        os.mkdir(basepath_out)
 
    download(baseurl=baseurl, file_m3u8=file_m3u8,path_in=basepath_in)
    key = key_test(key)
    decode_openssl(key,iv,basepath_in,basepath_out)
    mergeFileToMP4(basepath_out)
    clear_ts(basepath_in)
 
 
 
if __name__ == '__main__':
    # https://xxxxxxx/video/20210713/ea044c31965940559162b816ec8e152a/cloudv-transfer/a08a0bff11c84000b465638605564520_0000001.ts
    baseurl="https://xxxxxxxxx/video/20210713/ea044c31965940559162b816ec8e152a/cloudv-transfer/"
    key="±úx£Ú:êh'ÿs{câ"
    iv="131f71ed838a8019b731be5b7f2a1703"
    file_m3u8="./jixian/3.m3u8"
    file_m3u8 = os.path.join(os.getcwd(),file_m3u8)
    if(os.path.exists(file_m3u8)):
        main(baseurl,key,iv,file_m3u8)
    else:
        print("[-]"+file_m3u8+" not found:\n")
    # download(baseurl)