X书hmac参数-蒲公英云

X书hmac参数

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全文可以查看：
上面一遍unidbg解密shield文章

unidbg - 》 callObjectMethodV方法填写你的小红书路径下s.xml里的值:

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或者在抓包响应头中: 查找xy-ter-str

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hmac 结果都是在，响应头里，所以 hmac 是服务器下发给客户端的.

@Override
    public DvmObject<?> callObjectMethodV(BaseVM vm, DvmObject<?> dvmObject, String signature, VaList vaList) {
        switch (signature) {
            case "android/content/Context->getSharedPreferences(Ljava/lang/String;I)Landroid/content/SharedPreferences;":
                return vm.resolveClass("android/content/SharedPreferences").newObject(vaList.getObjectArg(0));
            case "android/content/SharedPreferences->getString(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;": {
                if(((StringObject) dvmObject.getValue()).getValue().equals("s")){
                    System.out.println("getString :"+vaList.getObjectArg(0).getValue());
                    if (vaList.getObjectArg(0).getValue().equals("main")) {
                        return new StringObject(vm, "");
                    }
                    if(vaList.getObjectArg(0).getValue().equals("main_hmac")){
                        return  new StringObject(vm, "a9+xPqTwWr7ua8QlDuTyLjvNTAszAxbIhBWeugeCNpcorLQJTUiH6JbLFDrW1cypknldr7izHSeoGQ1HzB6VAVu7iMG6FU1+bEt7/e+9cx6LmeDCOKSapcI9elpXr9ba");
                    }
                }
            }
            case "okhttp3/Interceptor$Chain->request()Lokhttp3/Request;": {
                DvmClass clazz = vm.resolveClass("okhttp3/Request");
                return clazz.newObject(request);
            }
            case "okhttp3/Request->url()Lokhttp3/HttpUrl;": {
                DvmClass clazz = vm.resolveClass("okhttp3/HttpUrl");
                Request request = (Request) dvmObject.getValue();
                return clazz.newObject(request.url());
            }
            case "okhttp3/HttpUrl->encodedPath()Ljava/lang/String;": {
                HttpUrl httpUrl = (HttpUrl) dvmObject.getValue();
                return new StringObject(vm, httpUrl.encodedPath());
            }
            case "okhttp3/HttpUrl->encodedQuery()Ljava/lang/String;": {
                HttpUrl httpUrl = (HttpUrl) dvmObject.getValue();
                return new StringObject(vm, httpUrl.encodedQuery());
            }
            case "okhttp3/Request->body()Lokhttp3/RequestBody;": {
                Request request = (Request) dvmObject.getValue();
                return vm.resolveClass("okhttp3/RequestBody").newObject(request.body());
            }
            case "okhttp3/Request->headers()Lokhttp3/Headers;": {
                Request request = (Request) dvmObject.getValue();
                return vm.resolveClass("okhttp3/Headers").newObject(request.headers());
            }
            case "okio/Buffer->writeString(Ljava/lang/String;Ljava/nio/charset/Charset;)Lokio/Buffer;": {
                System.out.println("write to my buffer:"+vaList.getObjectArg(0).getValue());
                Buffer buffer = (Buffer) dvmObject.getValue();
                buffer.writeString(vaList.getObjectArg(0).getValue().toString(), (Charset) vaList.getObjectArg(1).getValue());
                return dvmObject;
            }
            case "okhttp3/Headers->name(I)Ljava/lang/String;": {
                Headers headers = (Headers) dvmObject.getValue();
                return new StringObject(vm, headers.name(vaList.getIntArg(0)));
            }
            case "okhttp3/Headers->value(I)Ljava/lang/String;": {
                Headers headers = (Headers) dvmObject.getValue();
                return new StringObject(vm, headers.value(vaList.getIntArg(0)));
            }
            case "okio/Buffer->clone()Lokio/Buffer;": {
                Buffer buffer = (Buffer) dvmObject.getValue();
                return vm.resolveClass("okio/Buffer").newObject(buffer.clone());
            }
            case "okhttp3/Request->newBuilder()Lokhttp3/Request$Builder;": {
                Request request = (Request) dvmObject.getValue();
                return vm.resolveClass("okhttp3/Request$Builder").newObject(request.newBuilder());
            }
            case "okhttp3/Request$Builder->header(Ljava/lang/String;Ljava/lang/String;)Lokhttp3/Request$Builder;": {
                Request.Builder builder = (Request.Builder) dvmObject.getValue();
                builder.header(vaList.getObjectArg(0).getValue().toString(), vaList.getObjectArg(1).getValue().toString());
                return dvmObject;
            }
            case "okhttp3/Request$Builder->build()Lokhttp3/Request;": {
                Request.Builder builder = (Request.Builder) dvmObject.getValue();
                return vm.resolveClass("okhttp3/Request").newObject(builder.build());
            }
            case "okhttp3/Interceptor$Chain->proceed(Lokhttp3/Request;)Lokhttp3/Response;": {
                return vm.resolveClass("okhttp3/Response").newObject(null);
            }
        }
        return super.callObjectMethodV(vm, dvmObject, signature, vaList);
    }