先抓包获得提交订单的请求如下

可以看到签名的参数在header里面，名字叫做x-sign，jadx搜索一下

然后在接着搜索X_SIGN
然后根据名字猜测到在这个位置

函数如下

public String getSign(HashMap<String, String> params, String appKey) {
        String str;
        UnsupportedEncodingException e;
        SecException e2;
        String str2 = "";
        String str3 = (String) mo28972a((Map<String, String>) params, appKey).get("INPUT");
        try {
            if (this.f13463e == null || StringUtils.isBlank(str3)) {
                TBSdkLog.m3641e("mtopsdk.InnerSignImpl", mo44553c() + " [getSign]middleTier null or data data ", "appKeyIndex=" + this.f23497a.appKeyIndex + ",authCode=" + this.f23497a.authCode);
                return "";
            }
            HashMap hashMap = new HashMap();
            hashMap.put("data", str3.getBytes("UTF-8"));
            hashMap.put("env", Integer.valueOf(m13472d()));
            hashMap.put("appkey", appKey);
            HashMap sign = this.f13463e.getSign(hashMap);
            if (sign == null || sign.isEmpty()) {
                TBSdkLog.m3641e("mtopsdk.InnerSignImpl", mo44553c() + " [getSign]get sign failed with no output ", "appKeyIndex=" + this.f23497a.appKeyIndex + ",authCode=" + this.f23497a.authCode);
                return "";
            }
            str = (String) sign.remove(HttpHeaderConstant.X_SIGN);
            try {
                if (!StringUtils.isNotBlank(str)) {
                    return str;
                }
                params.putAll(sign);
                return str;
            } catch (UnsupportedEncodingException e3) {
                e = e3;
                TBSdkLog.m3642e("mtopsdk.InnerSignImpl", mo44553c() + " [getSign]your input data transfer to byte utf-8 failed ", "appKeyIndex=" + this.f23497a.appKeyIndex + ",authCode=" + this.f23497a.authCode, e);
                return str;
            } catch (SecException e4) {
                e2 = e4;
                TBSdkLog.m3643e("mtopsdk.InnerSignImpl", mo44553c() + " [getSign]get sign failed and SecException errorCode " + e2.getErrorCode() + ",appKeyIndex=" + this.f23497a.appKeyIndex + ",authCode=" + this.f23497a.authCode, (Throwable) e2);
                return str;
            }
        } catch (UnsupportedEncodingException e5) {
            UnsupportedEncodingException unsupportedEncodingException = e5;
            str = str2;
            e = unsupportedEncodingException;
            TBSdkLog.m3642e("mtopsdk.InnerSignImpl", mo44553c() + " [getSign]your input data transfer to byte utf-8 failed ", "appKeyIndex=" + this.f23497a.appKeyIndex + ",authCode=" + this.f23497a.authCode, e);
            return str;
        } catch (SecException e6) {
            SecException secException = e6;
            str = str2;
            e2 = secException;
            TBSdkLog.m3643e("mtopsdk.InnerSignImpl", mo44553c() + " [getSign]get sign failed and SecException errorCode " + e2.getErrorCode() + ",appKeyIndex=" + this.f23497a.appKeyIndex + ",authCode=" + this.f23497a.authCode, (Throwable) e2);
            return str;
        }
    }

不用去关心他到底怎么计算签名，直接写一段hook看一下是否用的这个函数进行签名

    setTimeout(function() {
    Java.perform(function() {


        var HttpRequestEntity = Java.use('mtopsdk.security.b'); //要hook的类名完整路径
        // var func = new HttpRequestEntity();
        // func.signature('1', '13123', false);
        HttpRequestEntity.getSign.implementation = function(arg1, arg2) { // 重写要hook的方法getSign，当有多个重名函数时需要重载，function括号为函数的参数个数

            var Sign = this.getSign(arg1, arg2); //调用原始的函数实现并且获得返回值，如果不写的话我们下面的代码会全部替换原函数

            send("arg1:" + arg1); //打印参数值
            send("arg2:" + arg2);


            send("result:" + Sign); //打印返回值

            return Sign; //函数有返回值时需要返回
        };

    })

});

➜  x frida-ps -U |grep damai
16738  cn.damai
17005  cn.damai:channel
➜  x frida -l damai.js -U -f cn.damai --no-pause
     ____
    / _  |   Frida 12.7.22 - A world-class dynamic instrumentation toolkit
   | (_| |
    > _  |   Commands:
   /_/ |_|       help      -> Displays the help system
   . . . .       object?   -> Display information about 'object'
   . . . .       exit/quit -> Exit
   . . . .
   . . . .   More info at https://www.frida.re/docs/home/
Spawned `cn.damai`. Resuming main thread!
message: {'type': 'send', 'payload': 'arg1:{data={"itemId":"613369982548","scenario":"itemsku","channel_from":"damai_market","bizCode":"ali.china.damai","appType":"1","osType":"2","exParams":"{}","source":"10101","version":"6000076"}, lng=118.818906, utdid=XCquBhVOGfwDAMHCRzpMcJHX, ttid=10005890@damai_android_7.7.2, deviceId=Auw_p33fvcb-qYhQnFUd4IAw1zJfUPYAfdVSWlF8OCH7, sid=149c5f8c17bf88a759f4ec5ebc6ae27a, uid=2206462755405, x-features=27, t=1584889999, v=2.0, appKey=23781390, api=mtop.alibaba.detail.subpage.getdetail, lat=32.107127}'} data: None
message: {'type': 'send', 'payload': 'arg2:23781390'} data: None
message: {'type': 'send', 'payload': 'result:ab25b000902a1cb73174adb1f6ffd602c2b885dd8e6efbc4ec'} data: None

看参数基本就是这个函数了，我们再把之前抓包抓到的参数拿去签名然后对比一下结果是否一样校验一下
在看一下sign的这个类，其实还有一个init初始化函数

   public void init(@NonNull MtopConfig mtopConfig) {
        super.init(mtopConfig);
        String c = mo44553c();
        try {
            SignStatistics.m23759a(mtopConfig.uploadStats);
            long currentTimeMillis = System.currentTimeMillis();
            this.f13461c = SecurityGuardManager.getInstance(this.f23497a.context);
            m13470a(StringUtils.isEmpty(mtopConfig.appKey) ? m13468a(mtopConfig.appKeyIndex, mo44552b()) : mtopConfig.appKey, mo44552b());
            MtopSDKThreadPoolExecutorFactory.submit(new InnerSignImpl$1(this, this.f23497a.context, c));
            m13471a(mtopConfig);
            if (TBSdkLog.isLogEnable(LogEnable.InfoEnable)) {
                TBSdkLog.m3644i("mtopsdk.InnerSignImpl", c + " [init]ISign init SecurityGuard succeed.init time=" + (System.currentTimeMillis() - currentTimeMillis));
            }
        } catch (SecException e) {
            int errorCode = e.getErrorCode();
            SignStatistics.m23758a(SignStatsType.TYPE_SG_MANAGER, String.valueOf(errorCode), "");
            TBSdkLog.m3643e("mtopsdk.InnerSignImpl", c + " [init]ISign init SecurityGuard error.errorCode=" + errorCode, (Throwable) e);
        } catch (Exception e2) {
            TBSdkLog.m3643e("mtopsdk.InnerSignImpl", c + " [init]ISign init SecurityGuard error.", (Throwable) e2);
        }
    }

我们在写一个hook看一下传进来的参数是什么

setTimeout(function() {
    Java.perform(function() {


        var HttpRequestEntity = Java.use('mtopsdk.security.b'); //要hook的类名完整路径
        // var func = new HttpRequestEntity();
        // func.signature('1', '13123', false);
        HttpRequestEntity.init.implementation = function(arg1) { // 重写要hook的方法getSign，当有多个重名函数时需要重载，function括号为函数的参数个数

            var Sign = this.init(arg1); //调用原始的函数实现并且获得返回值，如果不写的话我们下面的代码会全部替换原函数

            send("arg1:" + arg1); //打印参数值
            //mtopsdk.mtop.global.MtopConfig


            send("result:" + Sign); //打印返回值

            return Sign; //函数有返回值时需要返回
        };

    })

});

执行结果如下

➜  x frida -l init.js -U -f cn.damai --no-pause
     ____
    / _  |   Frida 12.7.22 - A world-class dynamic instrumentation toolkit
   | (_| |
    > _  |   Commands:
   /_/ |_|       help      -> Displays the help system
   . . . .       object?   -> Display information about 'object'
   . . . .       exit/quit -> Exit
   . . . .
   . . . .   More info at https://www.frida.re/docs/home/
Spawned `cn.damai`. Resuming main thread!
[Samsung SM-G9550::cn.damai]-> message: {'type': 'send', 'payload': 'arg1:mtopsdk.mtop.global.MtopConfig@c1b5599'} data: None

可以看到传进来的是mtopsdk.mtop.global.MtopConfig这么一个类，那么我们来看一下这个类
这个类初始化的时候也有一个参数

  public MtopConfig(String instanceId2) {
        this.instanceId = instanceId2;
    }

再写一个hook看一下

setTimeout(function() {
    Java.perform(function() {


        var HttpRequestEntity = Java.use('mtopsdk.mtop.global.MtopConfig'); //要hook的类名完整路径
        // var func = new HttpRequestEntity();
        // func.signature('1', '13123', false);
        HttpRequestEntity.$init.implementation = function(arg1) { // 重写要hook的方法getSign，当有多个重名函数时需要重载，function括号为函数的参数个数

            var Sign = this.$init(arg1); //调用原始的函数实现并且获得返回值，如果不写的话我们下面的代码会全部替换原函数

            send("arg1:" + arg1); //打印参数值
            //mtopsdk.mtop.global.MtopConfig


            send("result:" + Sign); //打印返回值

            return Sign; //函数有返回值时需要返回
        };

    })

});

结果如下

➜  x frida -l config.js -U -f cn.damai --no-pause
     ____
    / _  |   Frida 12.7.22 - A world-class dynamic instrumentation toolkit
   | (_| |
    > _  |   Commands:
   /_/ |_|       help      -> Displays the help system
   . . . .       object?   -> Display information about 'object'
   . . . .       exit/quit -> Exit
   . . . .
   . . . .   More info at https://www.frida.re/docs/home/
Spawned `cn.damai`. Resuming main thread!
[Samsung SM-G9550::cn.damai]-> message: {'type': 'send', 'payload': 'arg1:INNER'} data: None
message: {'type': 'send', 'payload': 'result:undefined'} data: None
message: {'type': 'send', 'payload': 'arg1:OPEN'} data: None
message: {'type': 'send', 'payload': 'result:undefined'} data: None
message: {'type': 'send', 'payload': 'arg1:INNER'} data: None
message: {'type': 'send', 'payload': 'result:undefined'} data: None
message: {'type': 'send', 'payload': 'arg1:OPEN'} data: None

可以看到要么是OPEN，要么是INNER，那么就非常明了了，我们写一个脚本把参数带进去签名一下对比一下结果
这是原始参数

message: {'type': 'send', 'payload': 'arg1:{data={"itemId":"613369982548","scenario":"itemsku","channel_from":"damai_market","bizCode":"ali.china.damai","appType":"1","osType":"2","exParams":"{}","source":"10101","version":"6000076"}, lng=118.818906, utdid=XCquBhVOGfwDAMHCRzpMcJHX, ttid=10005890@damai_android_7.7.2, deviceId=Auw_p33fvcb-qYhQnFUd4IAw1zJfUPYAfdVSWlF8OCH7, sid=149c5f8c17bf88a759f4ec5ebc6ae27a, uid=2206462755405, x-features=27, t=1584889999, v=2.0, appKey=23781390, api=mtop.alibaba.detail.subpage.getdetail, lat=32.107127}'} data: None
message: {'type': 'send', 'payload': 'arg2:23781390'} data: None
message: {'type': 'send', 'payload': 'result:ab25b000902a1cb73174adb1f6ffd602c2b885dd8e6efbc4ec'} data: None

脚本如下

import frida, sys
from urllib import parse
from time import sleep

def on_message(message, data):
    global result
    result=message
    print('----------------------------------------------------------------')
    print(message,data)
        
jscode = """
function sign(args) {
    Java.perform(function () {
        var HashMap = Java.use('java.util.HashMap');
        var hm = HashMap.$new();
        var hm1=HashMap.$new();

        var config = Java.use('mtopsdk.mtop.global.MtopConfig');
        var mconfig=config.$new("INNER");
        console.log(args)
        hm1.put("buyNow","true");
        hm1.put("exParams",args);
        hm1.put("buyParam","613369982548_1_4314464576860")

        hm.put("data",args);
        hm.put("lng","118.818906");
        hm.put("utdid","XCquBhVOGfwDAMHCRzpMcJHX");
        hm.put("ttid","10005890@damai_android_7.7.2")
        hm.put("deviceId","Auw_p33fvcb-qYhQnFUd4IAw1zJfUPYAfdVSWlF8OCH7")
        hm.put("sid","149c5f8c17bf88a759f4ec5ebc6ae27a")
        hm.put("uid","2206462755405")
        hm.put("x-features","27")
        hm.put("t","1584889999")
        hm.put("v","2.0")
        hm.put("appKey","23781390")
        hm.put("api","mtop.alibaba.detail.subpage.getdetail")
        hm.put("lat","32.107127")
        console.log(hm)
        var HttpRequestEntity = Java.use('mtopsdk.security.b');
        var func = HttpRequestEntity.$new()
        func.init(mconfig);
        var result = func.getSign(hm,"23781390")
        send("sign:" + result);
        return result;
    })
}
function onMessage(pokeMessage) {
    sign(pokeMessage['line']);
    recv('sign', onMessage);
}
recv('sign', onMessage);
"""
process = frida.get_usb_device().attach('cn.damai')
result=[]
script = process.create_script(jscode)
script.on('message', on_message)
script.load()
# params='''{"buyNow":"true","exParams":"{\"umpChannel\":\"10001\",\"coupon\":\"true\",\"websiteLanguage\":\"zh_CN_#Hans\",\"channel\":\"damai_app\",\"atomSplit\":\"1\",\"seatInfo\":\"\",\"coVersion\":\"2.0\"}","buyParam":"613369982548_1_4314464576860"}'''
params='''{"buyNow":"true","exParams":"{\\"umpChannel\\":\\"10001\\",\\"coupon\\":\\"true\\",\\"websiteLanguage\\":\\"zh_CN_#Hans\\",\\"channel\\":\\"damai_app\\",\\"atomSplit\\":\\"1\\",\\"seatInfo\\":\\"\\",\\"coVersion\":\\"2.0\\"}","buyParam":"613369982548_1_4314464576860"}'''
# params='''"{\\"umpChannel\\":\\"10001\\",\\"coupon\\":\\"true\\",\\"websiteLanguage\\":\\"zh_CN_#Hans\\",\\"channel\\":\\"damai_app\\",\\"atomSplit\\":\\"1\\",\\"seatInfo\\":\\"\\",\\"coVersion\":\\"2.0\\"}"'''
# print(params)
params ='''{"itemId":"613369982548","scenario":"itemsku","channel_from":"damai_market","bizCode":"ali.china.damai","appType":"1","osType":"2","exParams":"{}","source":"10101","version":"6000076"}'''
script.post({"type": "sign",'line':params})

'''
lng = 118.818534, utdid = XCquBhVOGfwDAMHCRzpMcJHX, 
ttid = 10005890 @damai_android_7 .7 .2, 
deviceId = Auw_p33fvcb - qYhQnFUd4IAw1zJfUPYAfdVSWlF8OCH7, 
sid = 149 c5f8c17bf88a759f4ec5ebc6ae27a, 
uid = 2206462755405, x - features = 27, t = 1584888568, v = 4.0, appKey = 23781390, 
api = mtop.trade.order.build, lat = 32.106986
'''
while True:
    if result!=[]:
        print(result)
        print('over')
        break
    sleep(1)

'''
message: {'type': 'send', 'payload': 'arg1:{data={"itemId":"613369982548","scenario":"itemsku","channel_from":"damai_market","bizCode":"ali.china.damai","appType":"1","osType":"2","exParams":"{}","source":"10101","version":"6000076"}
, lng=118.818906,
 utdid=XCquBhVOGfwDAMHCRzpMcJHX, ttid=10005890@damai_android_7.7.2, deviceId=Auw_p33fvcb-qYhQnFUd4IAw1zJfUPYAfdVSWlF8OCH7, 
 sid=149c5f8c17bf88a759f4ec5ebc6ae27a, uid=2206462755405, x-features=27, t=1584889999, v=2.0, appKey=23781390, api=mtop.alibaba.detail.subpage.getdetail, lat=32.107127}'} data: None
message: {'type': 'send', 'payload': 'arg2:23781390'} data: None
message: {'type': 'send', 'payload': 'result:ab25b000902a1cb73174adb1f6ffd602c2b885dd8e6efbc4ec'} data: None
'''

最新结果如下

➜  x python3 test.py
{"itemId":"613369982548","scenario":"itemsku","channel_from":"damai_market","bizCode":"ali.china.damai","appType":"1","osType":"2","exParams":"{}","source":"10101","version":"6000076"}
{data={"itemId":"613369982548","scenario":"itemsku","channel_from":"damai_market","bizCode":"ali.china.damai","appType":"1","osType":"2","exParams":"{}","source":"10101","version":"6000076"}, lng=118.818906, utdid=XCquBhVOGfwDAMHCRzpMcJHX, ttid=10005890@damai_android_7.7.2, deviceId=Auw_p33fvcb-qYhQnFUd4IAw1zJfUPYAfdVSWlF8OCH7, sid=149c5f8c17bf88a759f4ec5ebc6ae27a, uid=2206462755405, x-features=27, t=1584889999, v=2.0, appKey=23781390, api=mtop.alibaba.detail.subpage.getdetail, lat=32.107127}
----------------------------------------------------------------
{'type': 'send', 'payload': 'sign:ab25b000902a1cb73174adb1f6ffd602c2b885dd8e6efbc4ec'} None
{'type': 'send', 'payload': 'sign:ab25b000902a1cb73174adb1f6ffd602c2b885dd8e6efbc4ec'}
over
➜  x

对比一下之前的签名，一模一样，证明找对地方了

下面还需要解决x-mini-wua与wua
其实和sign都在同一个类里面，按照上面的方法在进行hook即可，

public String getWua(HashMap<String, String> params, String appKey) {
        String str;
        UnsupportedEncodingException e;
        SecException e2;
        String str2 = "";
        String str3 = (String) params.get("sign");
        try {
            if (this.f13463e == null || StringUtils.isBlank(str3)) {
                TBSdkLog.m3641e("mtopsdk.InnerSignImpl", mo44553c() + " [getWua]middleTier null or data data ", "appKeyIndex=" + this.f23497a.appKeyIndex + ",authCode=" + this.f23497a.authCode);
                return "";
            }
            HashMap hashMap = new HashMap();
            hashMap.put("data", str3.getBytes("UTF-8"));
            hashMap.put("env", Integer.valueOf(m13472d()));
            HashMap wua = this.f13463e.getWua(hashMap);
            if (wua == null || wua.isEmpty()) {
                TBSdkLog.m3641e("mtopsdk.InnerSignImpl", mo44553c() + " [getWua]get wua failed with no output ", "appKeyIndex=" + this.f23497a.appKeyIndex + ",authCode=" + this.f23497a.authCode);
                return "";
            }
            str = (String) wua.remove(ApiConstants.WUA);
            try {
                if (!StringUtils.isNotBlank(str)) {
                    return str;
                }
                params.putAll(wua);
                return str;
            } catch (UnsupportedEncodingException e3) {
                e = e3;
                TBSdkLog.m3642e("mtopsdk.InnerSignImpl", mo44553c() + " [getWua]your input data transfer to byte utf-8 failed ", "appKeyIndex=" + this.f23497a.appKeyIndex + ",authCode=" + this.f23497a.authCode, e);
                return str;
            } catch (SecException e4) {
                e2 = e4;
                TBSdkLog.m3643e("mtopsdk.InnerSignImpl", mo44553c() + " [getWua]get wua failed and SecException errorCode " + e2.getErrorCode() + ",appKeyIndex=" + this.f23497a.appKeyIndex + ",authCode=" + this.f23497a.authCode, (Throwable) e2);
                return str;
            }
        } catch (UnsupportedEncodingException e5) {
            UnsupportedEncodingException unsupportedEncodingException = e5;
            str = str2;
            e = unsupportedEncodingException;
            TBSdkLog.m3642e("mtopsdk.InnerSignImpl", mo44553c() + " [getWua]your input data transfer to byte utf-8 failed ", "appKeyIndex=" + this.f23497a.appKeyIndex + ",authCode=" + this.f23497a.authCode, e);
            return str;
        } catch (SecException e6) {
            SecException secException = e6;
            str = str2;
            e2 = secException;
            TBSdkLog.m3643e("mtopsdk.InnerSignImpl", mo44553c() + " [getWua]get wua failed and SecException errorCode " + e2.getErrorCode() + ",appKeyIndex=" + this.f23497a.appKeyIndex + ",authCode=" + this.f23497a.authCode, (Throwable) e2);
            return str;
        }
    }

    public String getMiniWua(HashMap<String, String> params, HashMap<String, String> ext) {
        String str;
        SecException e;
        String str2 = "";
        try {
            if (this.f13463e == null) {
                TBSdkLog.m3641e("mtopsdk.InnerSignImpl", mo44553c() + " [getMiniWua]middleTier ", "appKeyIndex=" + this.f23497a.appKeyIndex + ",authCode=" + this.f23497a.authCode);
                return "";
            }
            HashMap hashMap = new HashMap();
            hashMap.put("env", Integer.valueOf(m13472d()));
            if (ext == null) {
                ext = new HashMap<>();
            }
            ext.put(C3934e.f8409i, params.get("api"));
            hashMap.put("extend_paras", ext);
            HashMap miniWua = this.f13463e.getMiniWua(hashMap);
            if (miniWua == null || miniWua.isEmpty()) {
                TBSdkLog.m3641e("mtopsdk.InnerSignImpl", mo44553c() + " [getMiniWua]get miniwua failed with no output ", "appKeyIndex=" + this.f23497a.appKeyIndex + ",authCode=" + this.f23497a.authCode);
                return "";
            }
            str = (String) miniWua.remove("x-miniwua");
            try {
                if (!StringUtils.isNotBlank(str)) {
                    return str;
                }
                params.putAll(miniWua);
                return str;
            } catch (SecException e2) {
                e = e2;
                TBSdkLog.m3643e("mtopsdk.InnerSignImpl", mo44553c() + " [getMiniWua]get miniwua failed and SecException errorCode " + e.getErrorCode() + ",appKeyIndex=" + this.f23497a.appKeyIndex + ",authCode=" + this.f23497a.authCode, (Throwable) e);
                return str;
            }
        } catch (SecException e3) {
            SecException secException = e3;
            str = str2;
            e = secException;
            TBSdkLog.m3643e("mtopsdk.InnerSignImpl", mo44553c() + " [getMiniWua]get miniwua failed and SecException errorCode " + e.getErrorCode() + ",appKeyIndex=" + this.f23497a.appKeyIndex + ",authCode=" + this.f23497a.authCode, (Throwable) e);
            return str;
        }
    }

一次失败的签名算法逆向过程

某电商App
首先抓包看到请求如下（magisk+edxposed+trustmealready屏蔽ssl验证）

直接jadx打开apk搜索functionId关键字

先定位到了第三个函数

public final String mo15331a(JSONObject jSONObject, String str) { //json对象
        try {
            String b = mo15238b();
            TreeMap treeMap = new TreeMap(new Comparator<String>() {
                /* renamed from: a */
                public int compare(String str, String str2) {
                    return str.compareTo(str2);
                }
            });
            if (jSONObject != null) {
                Iterator keys = jSONObject.keys();
                while (keys.hasNext()) {
                    String str2 = (String) keys.next();
                    if (!TextUtils.isEmpty(jSONObject.optString(str2))) {
                        treeMap.put(str2, jSONObject.optString(str2)); //遍历json对象
                    }
                }
            }
            if (!TextUtils.isEmpty(str)) {
                treeMap.put(JshopConst.JSKEY_JSBODY, str); //加入body
            }
            if (!TextUtils.isEmpty(b)) {
                treeMap.put("functionId", b);
            }
            StringBuilder sb = new StringBuilder();
            for (Entry value : treeMap.entrySet()) {
                sb.append((String) value.getValue()).append("&"); //拼接数据 k=v&
            }
            if (sb.toString().endsWith("&")) { //删除最后一个&
                sb.setLength(sb.length() - 1);
            }
            String c = MantoCryptoUtils.m4776c(C2656c.m2509a() + "7D6D16CC3D2BE89108F9DCFC9A855253", "616E746F"); //获取key C2656c.m2509a() = 2AA64BD44C4381F31D9DA68EFE377874
            MantoLog.m4788d("sign  ", "secretKey --->  " + c); // 02ad4470d1a24880b6d3aca1988694bf
            MantoLog.m4788d("sign  ", "data --->  " + sb); //需要签名的数据
            String a = MantoCryptoUtils.m4772a(sb.toString().getBytes("UTF-8"), c.getBytes("UTF-8")); //签名 HmacSHA256
            MantoLog.m4788d("sign  ", "sign --->  " + a);
            if (!TextUtils.isEmpty(a)) {
                return a.toLowerCase();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "";
    }

发现大概加密流程是
先把url参数传递进来，然后拼接成k=v&格式，然后使用MantoCryptoUtils.m4776c获取到hash_hmac的key，最后进行hash_hmac sha256加密，

MantoCryptoUtils.m4776c
  public static String getsecretKey(String str, String str2) {
    try{
        byte[] bytes = ("6A642D6D" + str2).getBytes("UTF-8");
        for (int i = 0; i < 16; i++) {
            bytes[i] = (byte) (bytes[i] ^ f3228d[i]);
        }
        String str3 = str + "D4F1E5BBBE321897A0F4BDEC91197EE0";
        SecretKeySpec secretKeySpec = new SecretKeySpec(bytes, f3226b);
        Cipher instance = Cipher.getInstance(f3227c);
        instance.init(2, secretKeySpec);
        return new String(instance.doFinal(xorData(str3.getBytes("UTF-8"))), "UTF-8");
    }catch (Exception e){
        return "";
    }
    }

直接把方法提取出来，写一个脚本获取到完整的key

然后在带入参数进行直接加密测试即可

import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.Mac;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.SecretKeySpec;
import main.util.ReplyCode;
import java.util.TreeMap;
/* renamed from: jd.wjlogin_sdk.util.ReplyCode */
/* compiled from: Proguard */

public class Main {
    private static byte[] f3228d = {ReplyCode.reply0x26, ReplyCode.reply0x38, 11, ReplyCode.reply0x64, -92, -85, 114, -41, -63, 30, ReplyCode.reply0x7b, ReplyCode.reply0x88, ReplyCode.reply0xaa, 102, 10, -32};
    private static String f3226b = "AES";
    private static String f3227c = "AES/ECB/PKCS5Padding";
    public static void main(String[] args) {
        System.out.println("Hello World!");
        System.out.println(getsecretKey("2AA64BD44C4381F31D9DA68EFE3778747D6D16CC3D2BE89108F9DCFC9A855253","616E746F"));
        String c=getsecretKey("2AA64BD44C4381F31D9DA68EFE3778747D6D16CC3D2BE89108F9DCFC9A855253","616E746F");
        String sb="asdsadasd";

        try{
        
            String a = Sign(sb.getBytes("UTF-8"), c.getBytes("UTF-8")); //签名 HmacSHA256
            System.out.println(a);
        }catch (Exception e){

        }

    }

    public static String Sign(byte[] bArr, byte[] bArr2) {
        try {
            SecretKeySpec secretKeySpec = new SecretKeySpec(bArr2, "HmacSHA256");
            Mac instance = Mac.getInstance("HmacSHA256");
            instance.init(secretKeySpec);
            return toHex(instance.doFinal(bArr));
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e2) {
            e2.printStackTrace();
        }
        return null;
    }
    private static String toHex(byte[] bArr) {
        StringBuilder sb = new StringBuilder();
        int i = 0;
        while (bArr != null && i < bArr.length) {
            String hexString = Integer.toHexString(bArr[i] & 255);
            if (hexString.length() == 1) {
                sb.append('0');
            }
            sb.append(hexString);
            i++;
        }
        return sb.toString().toUpperCase();
    }
    private static byte[] xorData(byte[] bArr) {
        if (bArr.length % 2 != 0) {
            return null;
        }
        byte[] bArr2 = new byte[(bArr.length / 2)];
        for (int i = 0; i < bArr.length; i += 2) {
            bArr2[i / 2] = (byte) Integer.parseInt(new String(bArr, i, 2), 16);
        }
        return bArr2;
    }
    public static String getsecretKey(String str, String str2) {
    try{
        byte[] bytes = ("6A642D6D" + str2).getBytes("UTF-8");
        for (int i = 0; i < 16; i++) {
            bytes[i] = (byte) (bytes[i] ^ f3228d[i]);
        }
        String str3 = str + "D4F1E5BBBE321897A0F4BDEC91197EE0";
        SecretKeySpec secretKeySpec = new SecretKeySpec(bytes, f3226b);
        Cipher instance = Cipher.getInstance(f3227c);
        instance.init(2, secretKeySpec);
        return new String(instance.doFinal(xorData(str3.getBytes("UTF-8"))), "UTF-8");
    }catch (Exception e){
        return "";
    }


    }
}

最后发现使用这个加密方式的接口已经废弃不再使用，所以试一次失败的逆袭过程，在花点时间找一下新接口的加密算法了，记录一下过程。