JS调试之破解某视频网站ddr字幕文件加密

https://ddrk.me/

一个还不错的视频网站，资源不多但质量都比较好

直接看 node.js 代码吧，F12找到ddr文件下载之后自己匹配一下文件名规律

运行

npm install pako crypto-js

安装一下包

var CryptoJS = require("crypto-js");
var pako = require("pako");
var fs = require("fs")

for (etemp=1;etemp<=8;etemp++){
    var eAB = fs.readFileSync('Sex_Education_S01E0'+etemp+'_re.ddr');
    var wordArray = CryptoJS.lib.WordArray.create(eAB.slice(16));
    var hexStr = Array.prototype.map.call(new Uint8Array(eAB.slice(0, 16)), x => ('00' + x.toString(16)).slice(-2)).join('');
    var wordArray2 = CryptoJS.enc.Hex.parse(hexStr);
    var jsdec = CryptoJS.AES.decrypt({ciphertext:wordArray},wordArray2,{
    iv: wordArray2,
    mode: CryptoJS.mode.CBC
    });
    var binary_string = new Buffer(jsdec.toString(CryptoJS.enc.Base64), 'base64').toString('binary');
    var len = binary_string.length;
    var bytes = new Uint8Array(len);
    for (var i = 0; i < len; i++) {
    bytes[i] = binary_string.charCodeAt(i);
    }
    var data = pako.ungzip(bytes.buffer,{to:'string'});

    fs.writeFileSync('S01E0'+etemp+'.srt', data);

    console.log('done');
}