1、背景

不知道什么时候开始，各家音乐APP都开始对API进行加密，最近一段时间对六大音乐平台的加密算法进行了研究，逆向了网页端、安卓端等等，已经掌握了各家的加密算法。

平台	加密算法	非加密接口	专属资源	海外IP支持
QQ	MD5	存在，可完全替代加密接口	需要绿钻Cookie	不支持，需要国内IP代理
KW	DES	存在，可完全替代加密接口	不需要额外信息	支持
KG	MD5	存在，不能完全替代加密接口	需要豪华会员Cookie	不支持，需要国内IP代理,或在请求后附加area_code=0
WY	AES、RSA、MD5	存在，少数接口不能使用未加密接口，如登录	需要黑胶Cookie	不支持，但可通过设置X-Real-IP规避
MG	MD5	存在，可完全替代加密接口	不需要额外信息	支持
XM	MD5加密	存在，可完全替代加密接口	不需要额外信息	不支持，需要国内IP代理

2、QQ音乐sign计算

首先说明，所有加密接口都有非加密的替代接口，但是以后肯定是向加密接口发展，两个最基础的API是

https://u.y.qq.com/cgi-bin/musicu.fcg  支持加密和非加密https://u.y.qq.com/cgi-bin/musics.fcg 仅支持加密

以上说多了，这篇主要是讲如何计算最新版的QQ音乐加密参数。

首先打开QQ音乐官网，F12打开开发者工具，我们随便找一条加密的链接

如图所示，我们可以看到这样一条链接

https://u.y.qq.com/cgi-bin/musics.fcg?-=getUCGI6892186109455234&g_tk=680034686&sign=zzadg51jzc4krod4v97bc3696a5f2740962d1e6c467957c88&loginUin=0&hostUin=0&format=json&inCharset=utf8&outCharset=utf-8&notice=0&platform=yqq.json&needNewCode=0&data=%7B%22detail%22%3A%7B%22module%22%3A%22musicToplist.ToplistInfoServer%22%2C%22method%22%3A%22GetDetail%22%2C%22param%22%3A%7B%22topId%22%3A4%2C%22offset%22%3A0%2C%22num%22%3A20%2C%22period%22%3A%222020-12-21%22%7D%7D%2C%22comm%22%3A%7B%22ct%22%3A24%2C%22cv%22%3A0%7D%7D

在链接中有个参数,我们的目标就是得到这个参数如何计算的方式

sign=zzadg51jzc4krod4v97bc3696a5f2740962d1e6c467957c88

点Initiator，找一下请求来源，点击来源的JS

在打开的JS里面查找sign找到如下图所示的区域，sign就是在这里得到的（格式化下js代码，否则看不清楚流程）在图中位置下断点，再刷新页面

https://y.gtimg.cn/music/portal/js/common/pkg/common_d9439fa.js?max_age=31536000:formatted

然后断在了这个地方，如果不是加密链接就放过，如果是，就步入

可以把鼠标放在变量上或者再控制台打印变量数据,如下图所示，我将请求的URL和请求参数打印了出来

//u.y.qq.com/cgi-bin/musicu.fcg?-=getUCGI4444074835099534&g_tk=680034686

{"detail":{"module":"musicToplist.ToplistInfoServer","method":"GetDetail","param":{"topId":4,"offset":0,"num":20,"period":"2020-12-21"}},"comm":{"ct":24,"cv":0}}

sign就是对请求参数加密之后得到的。

继续步入后，我们跳转到了下面这个JS里面，请求参数就是在这里加密的

https://y.qq.com/component/m/qmfe-security-sign/index.umd.js?max_age=2592000:formatted

具体的内容

!function(n, t) {"object" == typeof exports && "undefined" != typeof module ? module.exports = t() : "function" == typeof define && define.amd ? define(t) : (n = n || self).getSecuritySign = t()
}(this, function() {"use strict";var n = function() {if ("undefined" != typeof self)return self;if ("undefined" != typeof window)return window;if ("undefined" != typeof global)return global;throw new Error("unable to locate global object")}();n.__sign_hash_20200305 = function(n) {function l(n, t) {var o = (65535 & n) + (65535 & t);return (n >> 16) + (t >> 16) + (o >> 16) << 16 | 65535 & o}function r(n, t, o, e, u, p) {return l((i = l(l(t, n), l(e, p))) << (r = u) | i >>> 32 - r, o);var i, r}function g(n, t, o, e, u, p, i) {return r(t & o | ~t & e, n, t, u, p, i)}function a(n, t, o, e, u, p, i) {return r(t & e | o & ~e, n, t, u, p, i)}function s(n, t, o, e, u, p, i) {return r(t ^ o ^ e, n, t, u, p, i)}function v(n, t, o, e, u, p, i) {return r(o ^ (t | ~e), n, t, u, p, i)}function t(n) {return function(n) {var t, o = "";for (t = 0; t < 32 * n.length; t += 8)o += String.fromCharCode(n[t >> 5] >>> t % 32 & 255);return o}(function(n, t) {n[t >> 5] |= 128 << t % 32,n[14 + (t + 64 >>> 9 << 4)] = t;var o, e, u, p, i, r = 1732584193, f = -271733879, h = -1732584194, c = 271733878;for (o = 0; o < n.length; o += 16)r = g(e = r, u = f, p = h, i = c, n[o], 7, -680876936),c = g(c, r, f, h, n[o + 1], 12, -389564586),h = g(h, c, r, f, n[o + 2], 17, 606105819),f = g(f, h, c, r, n[o + 3], 22, -1044525330),r = g(r, f, h, c, n[o + 4], 7, -176418897),c = g(c, r, f, h, n[o + 5], 12, 1200080426),h = g(h, c, r, f, n[o + 6], 17, -1473231341),f = g(f, h, c, r, n[o + 7], 22, -45705983),r = g(r, f, h, c, n[o + 8], 7, 1770035416),c = g(c, r, f, h, n[o + 9], 12, -1958414417),h = g(h, c, r, f, n[o + 10], 17, -42063),f = g(f, h, c, r, n[o + 11], 22, -1990404162),r = g(r, f, h, c, n[o + 12], 7, 1804603682),c = g(c, r, f, h, n[o + 13], 12, -40341101),h = g(h, c, r, f, n[o + 14], 17, -1502002290),r = a(r, f = g(f, h, c, r, n[o + 15], 22, 1236535329), h, c, n[o + 1], 5, -165796510),c = a(c, r, f, h, n[o + 6], 9, -1069501632),h = a(h, c, r, f, n[o + 11], 14, 643717713),f = a(f, h, c, r, n[o], 20, -373897302),r = a(r, f, h, c, n[o + 5], 5, -701558691),c = a(c, r, f, h, n[o + 10], 9, 38016083),h = a(h, c, r, f, n[o + 15], 14, -660478335),f = a(f, h, c, r, n[o + 4], 20, -405537848),r = a(r, f, h, c, n[o + 9], 5, 568446438),c = a(c, r, f, h, n[o + 14], 9, -1019803690),h = a(h, c, r, f, n[o + 3], 14, -187363961),f = a(f, h, c, r, n[o + 8], 20, 1163531501),r = a(r, f, h, c, n[o + 13], 5, -1444681467),c = a(c, r, f, h, n[o + 2], 9, -51403784),h = a(h, c, r, f, n[o + 7], 14, 1735328473),r = s(r, f = a(f, h, c, r, n[o + 12], 20, -1926607734), h, c, n[o + 5], 4, -378558),c = s(c, r, f, h, n[o + 8], 11, -2022574463),h = s(h, c, r, f, n[o + 11], 16, 1839030562),f = s(f, h, c, r, n[o + 14], 23, -35309556),r = s(r, f, h, c, n[o + 1], 4, -1530992060),c = s(c, r, f, h, n[o + 4], 11, 1272893353),h = s(h, c, r, f, n[o + 7], 16, -155497632),f = s(f, h, c, r, n[o + 10], 23, -1094730640),r = s(r, f, h, c, n[o + 13], 4, 681279174),c = s(c, r, f, h, n[o], 11, -358537222),h = s(h, c, r, f, n[o + 3], 16, -722521979),f = s(f, h, c, r, n[o + 6], 23, 76029189),r = s(r, f, h, c, n[o + 9], 4, -640364487),c = s(c, r, f, h, n[o + 12], 11, -421815835),h = s(h, c, r, f, n[o + 15], 16, 530742520),r = v(r, f = s(f, h, c, r, n[o + 2], 23, -995338651), h, c, n[o], 6, -198630844),c = v(c, r, f, h, n[o + 7], 10, 1126891415),h = v(h, c, r, f, n[o + 14], 15, -1416354905),f = v(f, h, c, r, n[o + 5], 21, -57434055),r = v(r, f, h, c, n[o + 12], 6, 1700485571),c = v(c, r, f, h, n[o + 3], 10, -1894986606),h = v(h, c, r, f, n[o + 10], 15, -1051523),f = v(f, h, c, r, n[o + 1], 21, -2054922799),r = v(r, f, h, c, n[o + 8], 6, 1873313359),c = v(c, r, f, h, n[o + 15], 10, -30611744),h = v(h, c, r, f, n[o + 6], 15, -1560198380),f = v(f, h, c, r, n[o + 13], 21, 1309151649),r = v(r, f, h, c, n[o + 4], 6, -145523070),c = v(c, r, f, h, n[o + 11], 10, -1120210379),h = v(h, c, r, f, n[o + 2], 15, 718787259),f = v(f, h, c, r, n[o + 9], 21, -343485551),r = l(r, e),f = l(f, u),h = l(h, p),c = l(c, i);return [r, f, h, c]}(function(n) {var t, o = [];for (o[(n.length >> 2) - 1] = void 0,t = 0; 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});

然后在进入函数的返回出下断点，断在如下位置后，在控制台执行

r(f, e, c, l, t)

然后打印参数t,我们可以看到参数t里面出现了几个很特别的参数

CJBPACrRuNy797bc3696a5f2740962d1e6c467957c88{"detail":{"module":"musicToplist.ToplistInfoServer","method":"GetDetail","param":{"topId":4,"offset":0,"num":20,"period":"2020-12-21"}},"comm":{"ct":24,"cv":0}}

看到97bc3696a5f2740962d1e6c467957c88 这样的数字，又是32位，可以大胆地猜测是md5，事实上，97bc3696a5f2740962d1e6c467957c88就是 把固定的字符串CJBPACrRuNy7与请求参数拼接起来之后的md5值

CJBPACrRuNy7{"detail":{"module":"musicToplist.ToplistInfoServer","method":"GetDetail","param":{"topId":4,"offset":0,"num":20,"period":"2020-12-21"}},"comm":{"ct":24,"cv":0}}

这个JS文件的作用就是用JS实现了一段MD5加密算法。

多次探索之后，我发现sign由以下规则生成

固定头zza+一段随机的小写字符串，由小写字母和数字组成，长度为10-16位+对固定字符串和请求参数取md5。这三部分拼接而成。

下面回到我们调试的地方，取消所有断电，放开运行，之后我们就得到了一个网址

https://u.y.qq.com/cgi-bin/musics.fcg?-=getUCGI5601160880585316&g_tk=680034686&sign=zza4bb58zhof1tkhk8t97bc3696a5f2740962d1e6c467957c88&loginUin=0&hostUin=0&format=json&inCharset=utf8&outCharset=utf-8&notice=0&platform=yqq.json&needNewCode=0&data=%7B%22detail%22%3A%7B%22module%22%3A%22musicToplist.ToplistInfoServer%22%2C%22method%22%3A%22GetDetail%22%2C%22param%22%3A%7B%22topId%22%3A4%2C%22offset%22%3A0%2C%22num%22%3A20%2C%22period%22%3A%222020-12-21%22%7D%7D%2C%22comm%22%3A%7B%22ct%22%3A24%2C%22cv%22%3A0%7D%7D

计算出了sign后面就可以正常请求了。

3、Java代码实现

附上一段无名音乐中计算sign的代码，用Java实现

public class QqEncrypt {private static final String encNonce="CJBPACrRuNy7";private static final String signPrxfix="zza";private static final char[] dir="0234567890abcdefghijklmnopqrstuvwxyz".toCharArray();/****@param encParams 需要加密的参数，这是一段请求体数据，为json字符串格式，例如下面的格式，可以抓包获取*                 {"comm":{"ct":24,"cv":0},"vip":{"module":"userInfo…baseinfo_v2","param":{"vec_uin":["3011429848"]}}}** @return 加密的方式为固定字串 zza加上一个10-16位的随机字符串再加上 固定字串 CJBPACrRuNy7加上请求数据拼接的 MD5值*/public static String getSign(String encParams){return signPrxfix+uuidGenerate()+ Md5Encrypt.convertToMd5(encNonce+encParams);}private static String uuidGenerate(){int minLen=10;int maxLen=16;Random ran=new Random(System.currentTimeMillis());int ranLen=ran.nextInt(maxLen-minLen)+minLen;StringBuilder sb=new StringBuilder(ranLen);for (int i=0;i<ranLen;i++){sb.append(dir[ran.nextInt(dir.length)]);}return sb.toString();}
}public class Md5Encrypt {//必须要重视编码问题了！折腾了好多天才发现MD5要用UTF-8形式加密public static String convertToMd5(String plainText) {byte[] secretBytes = null;try {secretBytes = MessageDigest.getInstance("md5").digest(plainText.getBytes("utf-8"));} catch (Exception e) {throw new RuntimeException("没有这个md5算法！");}String md5code = new BigInteger(1, secretBytes).toString(16);for (int i = 0; i < 32 - md5code.length(); i++) {md5code = "0" + md5code;}return md5code;}
}

下面是封装了一段请求代码

public class RequestModule {/*** musicu支持加密请求和不加密请求，没有对请求进行限制* musics仅支持加密请求*/private static final String[] apiServer={"https://u.y.qq.com/cgi-bin/musicu.fcg?","https://u.y.qq.com/cgi-bin/musics.fcg?"};private static final Map<String,String> headerMap=new HashMap<>();static {headerMap.put("user-agent","Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36 Edg/87.0.664.66");headerMap.put("accept-encoding","application/json");headerMap.put("cache-control","max-age=0");}/*** 请求示例：{"area":-100,"sex":-100,"genre":-100,"index":15,"sin":0,"cur_page":1}* @param area 地区 -100 不限* @param genre 流派 全部：-100，流行：1 ，摇滚：2，民谣：3，电子：4，爵士：5，嘻哈：6 .....* @param index 索引 热门:-100  范围 0-26 对应歌手名称拼音A-Z开头* @param sex 性别 不限：-100  男：0 女：1 组合：2* @param sin 偏移(第sin位)* @param currPage 当前页，第n页，默认每页最多80人* @return*/public static String getSingerList(int area,int genre,int index,int sex,int sin,int currPage){RequestTemplate template=new RequestTemplate("Music.SingerListServer","get_singer_list","{\"area\":"+area+",\"sex\":"+sex+",\"genre\":"+genre+",\"index\":"+index+",\"sin\":"+sin+",\"cur_page\":"+currPage+"}");RequestTemplateBuilder templateBuilder=new RequestTemplateBuilder();templateBuilder.add("singerList",template);String sign= QqEncrypt.getSign(templateBuilder.toString());Random ran=new Random(System.currentTimeMillis());return HttpRequestHelper.downloadWebSiteUsePost(apiServer[ran.nextInt(apiServer.length)]+"sign="+sign,templateBuilder.toString(),headerMap);}public static String getHotSingerList(){return getSingerList(-100,-100,-100,-100,0,1);}/**** @param songId 统一规范，指的是songmid* @return*/public static String getSongDetail(String songId){//{"songinfo":{"module":"music.pf_song_detail_svr","method":"get_song_detail","param":{"song_mid":"112344"}}}RequestTemplate template=new RequestTemplate("music.pf_song_detail_svr","get_song_detail","{\"song_mid\":\""+songId+"\"}");RequestTemplateBuilder templateBuilder=new RequestTemplateBuilder();templateBuilder.add("songdetail",template);String sign= QqEncrypt.getSign(templateBuilder.toString());Random ran=new Random(System.currentTimeMillis());return HttpRequestHelper.downloadWebSiteUsePost(apiServer[ran.nextInt(apiServer.length)] +"sign="+sign,templateBuilder.toString(),headerMap);}}

实体类

public class RequestTemplate{public String module="";public String method="";public Object param=new Object();public RequestTemplate() {}public RequestTemplate(String module, String method, Object param) {this.module = module;this.method = method;this.param = param;}public String getModule() {return module;}public void setModule(String module) {this.module = module;}public String getMethod() {return method;}public void setMethod(String method) {this.method = method;}public Object getParam() {return param;}public void setParam(Object param) {this.param = param;}@Overridepublic String toString() {return "{" +"\"module\":\"" + module + "\"" +",\"method\":\"" + method + "\"" +",\"param\":" + param.toString()  +"}";}
}/*** 构造请求结构，所有请求都可以是这样的** {*     "comm": {*         "ct": 24,*         "cv": 0*     },*     "singerList": {*         "module": "Music.SingerListServer",*         "method": "get_singer_list",*         "param": {*             "area": -100,*             "sex": -100,*             "genre": -100,*             "index": -100,*             "sin": 0,*             "cur_page": 1*         }*     }* }*/
public class RequestTemplateBuilder {private Map<String,Object> requestTemplateMap=new HashMap<>();public RequestTemplateBuilder add(String name, Object req){requestTemplateMap.put(name,req);return this;}@Overridepublic String toString() {StringBuilder sb=new StringBuilder();for (String key: requestTemplateMap.keySet()){sb.append("\"").append(key).append("\":").append(requestTemplateMap.get(key).toString()).append(",");}sb.substring(0,sb.length()-1);return "{"+sb.substring(0,sb.length()-1)+"}";}
}

4、总结

核心的加密函数在以下JS文件中实现，这段JS主要就是实现了MD5算法，由于以前没接触过如何实现MD5算法，在分析这段代码上还是遇到了很大困难的，不过我们在实现过程中完全不必自己实现MD5加密算法，我们可以直接使用各个语言上的加密库实现MD5加密。

https://y.qq.com/component/m/qmfe-security-sign/index.umd.js?max_age=2592000:formatted