Unity解密Qmcflac（qmcflac/qmc0/qmc3

作者: Walk_In_Jar | 来源:发表于2020-05-12 16:50 被阅读0次

Unity解密Qmcflac（qmcflac/qmc0/qmc3
qmcflac转换flac
qmc解码器
QQ音乐下载文件(qmc3/qmc0/qmcflac)批量格式转
qmc0、qmc3、qmcflac格式转换成mp3教程
QQ音乐qmc0、qmcflac转换工具
QQ音乐下载的VIP无损音乐不能在别的播放器使用的问题
Unity 加密解密
【Unity】「DES」数据加密解密
最好用的zip,rar压缩包解密码工具（附使用教程，亲测好用）免

【声明：本文仅为代码研究使用，严禁用于侵权等非法行为】

效果：

解密前 --解密后

源码转自 https://github.com/MegrezZhu/qmcdump
并不一定要unity来做，编译源码就行。

使用Visual studio2019 创建c++ 控制台应用

main.cpp脚本如下

#include <iostream>
#include <string>
#include "crypt.h"

using namespace std;

string convertName(const string& filename);

int main(int argc, char** argv) {
    if (argc != 2 && argc != 3) {
        cerr << "Usage: qmcdump <input_path> [output_path]" << endl;
        return 1;
    }

    string in = argv[1];
    string out = argc == 3 ? argv[2] : convertName(in);

    bool result = convert(in, out);
    if (!result) {
        return 1;
    }
    else {
        cout << "dumped to " << out << endl;
    }
}

string convertName(const string& filename) {
    auto pos = filename.rfind('.');
    if (pos == string::npos) {
        cerr << "Warning: no extname." << endl;
        return filename + "_CONVERTED";
    }
    else {
        auto base = filename.substr(0, pos);
        auto ext = filename.substr(pos + 1);
        if (ext == "qmcflac")
            ext = "flac";
        else if (ext == "qmc0" || ext == "qmc3")
            ext = "mp3";
        else {
            cerr << "Warning: unknown extname (support: qmcflac, qmc0, qmc3)."
                << endl;
            ext = "mp3";
        }
        return base + '.' + ext;
    }
}

创建crypt.h头文件

#include <cstdint>
#include <string>

const int BUFFER_SIZE = 8192;

int encrypt(int offset, char* buf, int len);
char mapL(int v);
bool convert(const std::string& in, const std::string& out);

创建crypt.cpp源文件

#include "crypt.h"
#include <fstream>
#include <iostream>
#include <vector>

using namespace std;

int encrypt(int offset, char* buf, int len) {
    if (offset < 0) {
        return -1;
    }
    for (int i = 0; i < len; ++i) {
        buf[i] ^= mapL(offset + i);
    }
    return 0;
}

char mapL(int v) {
    static const int key[] = {
        0x77, 0x48, 0x32, 0x73, 0xDE, 0xF2, 0xC0, 0xC8, 0x95, 0xEC, 0x30, 0xB2,
        0x51, 0xC3, 0xE1, 0xA0, 0x9E, 0xE6, 0x9D, 0xCF, 0xFA, 0x7F, 0x14, 0xD1,
        0xCE, 0xB8, 0xDC, 0xC3, 0x4A, 0x67, 0x93, 0xD6, 0x28, 0xC2, 0x91, 0x70,
        0xCA, 0x8D, 0xA2, 0xA4, 0xF0, 0x08, 0x61, 0x90, 0x7E, 0x6F, 0xA2, 0xE0,
        0xEB, 0xAE, 0x3E, 0xB6, 0x67, 0xC7, 0x92, 0xF4, 0x91, 0xB5, 0xF6, 0x6C,
        0x5E, 0x84, 0x40, 0xF7, 0xF3, 0x1B, 0x02, 0x7F, 0xD5, 0xAB, 0x41, 0x89,
        0x28, 0xF4, 0x25, 0xCC, 0x52, 0x11, 0xAD, 0x43, 0x68, 0xA6, 0x41, 0x8B,
        0x84, 0xB5, 0xFF, 0x2C, 0x92, 0x4A, 0x26, 0xD8, 0x47, 0x6A, 0x7C, 0x95,
        0x61, 0xCC, 0xE6, 0xCB, 0xBB, 0x3F, 0x47, 0x58, 0x89, 0x75, 0xC3, 0x75,
        0xA1, 0xD9, 0xAF, 0xCC, 0x08, 0x73, 0x17, 0xDC, 0xAA, 0x9A, 0xA2, 0x16,
        0x41, 0xD8, 0xA2, 0x06, 0xC6, 0x8B, 0xFC, 0x66, 0x34, 0x9F, 0xCF, 0x18,
        0x23, 0xA0, 0x0A, 0x74, 0xE7, 0x2B, 0x27, 0x70, 0x92, 0xE9, 0xAF, 0x37,
        0xE6, 0x8C, 0xA7, 0xBC, 0x62, 0x65, 0x9C, 0xC2, 0x08, 0xC9, 0x88, 0xB3,
        0xF3, 0x43, 0xAC, 0x74, 0x2C, 0x0F, 0xD4, 0xAF, 0xA1, 0xC3, 0x01, 0x64,
        0x95, 0x4E, 0x48, 0x9F, 0xF4, 0x35, 0x78, 0x95, 0x7A, 0x39, 0xD6, 0x6A,
        0xA0, 0x6D, 0x40, 0xE8, 0x4F, 0xA8, 0xEF, 0x11, 0x1D, 0xF3, 0x1B, 0x3F,
        0x3F, 0x07, 0xDD, 0x6F, 0x5B, 0x19, 0x30, 0x19, 0xFB, 0xEF, 0x0E, 0x37,
        0xF0, 0x0E, 0xCD, 0x16, 0x49, 0xFE, 0x53, 0x47, 0x13, 0x1A, 0xBD, 0xA4,
        0xF1, 0x40, 0x19, 0x60, 0x0E, 0xED, 0x68, 0x09, 0x06, 0x5F, 0x4D, 0xCF,
        0x3D, 0x1A, 0xFE, 0x20, 0x77, 0xE4, 0xD9, 0xDA, 0xF9, 0xA4, 0x2B, 0x76,
        0x1C, 0x71, 0xDB, 0x00, 0xBC, 0xFD, 0xC,  0x6C, 0xA5, 0x47, 0xF7, 0xF6,
        0x00, 0x79, 0x4A, 0x11 };

    if (v >= 0) {
        if (v > 0x7FFF) v %= 0x7FFF;
    }
    else {
        v = 0;
    }
    return char(key[(v * v + 80923) % 256]);
}
bool convert(const std::string& in, const std::string& out) {
    static char buf[BUFFER_SIZE];

    ifstream fin(in, ios::binary);
    if (!fin.is_open()) {
        cerr << "opening file " << in << " failed.";
        return false;
    }
    ofstream fout(out, ios::binary);
    if (!fout.is_open()) {
        cerr << "opening file " << out << " failed.";
        return false;
    }
    int offset = 0;
    while (true) {
        fin.read(buf, BUFFER_SIZE);
        int length = fin.gcount();
        encrypt(offset, buf, length);
        fout.write(buf, length);
        offset += length;
        if (!fin) break;
    }
    return true;
}

此时生成的exe文件即可使用控制台命令解密了，使用方法如下

image.png
怎么看有没有效果呢，qmcflac的文件如果是vip播放的，只能播放1分钟
output.flac即使显示是vip的也能播放。（腾讯爸爸放过我）

以下是使用unity批量转换的操作，目的是学习unity调用动态库dll。

VS依旧创建使用控制台应用

不过属性这里需要修改为x64的

修改配置类型为动态库dll

代码照搬上面的，只不过要修改main函数，源码提供了convertName方法，可以不提供导出的位置，程序自动判断输出位置及格式。
完整main.cpp如下

// ConsoleApplication1.cpp : 此文件包含 "main" 函数。程序执行将在此处开始并结束。
//
#include <string>
#include <iostream>
#include "crypt.h"
#define _DllExport extern "C" __declspec(dllexport)
using namespace std;

string convertName(const string& filename);
_DllExport int  DecryptQm(char** str_ptr)
{
    string in = str_ptr[0];
    string out = convertName(in);
    const char* p = out.data();
    bool result = convert(in, out);
    if (!result)
        return -1;
    else
        return 1;
}
string convertName(const string& filename) {
    auto pos = filename.rfind('.');
    if (pos == string::npos) {
        cerr << "Warning: no extname." << endl;
        return filename + "_CONVERTED";
    }
    else {
        auto base = filename.substr(0, pos);
        auto ext = filename.substr(pos + 1);
        if (ext == "qmcflac")
            ext = "flac";
        else if (ext == "qmc0" || ext == "qmc3")
            ext = "mp3";
        else {
            cerr << "Warning: unknown extname (support: qmcflac, qmc0, qmc3)."
                << endl;
            ext = "mp3";
        }
        return base + '.' + ext;
    }
}

生成dll文件放到unity的Plugins目录下。
unity下创建OpenDialogFile.cs脚本，用来选择需要处理的目录

using UnityEngine;
using System.Collections;
using System;
using System.Runtime.InteropServices;

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public class OpenDialogFile
{
    public int structSize = 0;
    public IntPtr dlgOwner = IntPtr.Zero;
    public IntPtr instance = IntPtr.Zero;
    public String filter = null;
    public String customFilter = null;
    public int maxCustFilter = 0;
    public int filterIndex = 0;
    public String file = null;
    public int maxFile = 0;
    public String fileTitle = null;
    public int maxFileTitle = 0;
    public String initialDir = null;
    public String title = null;
    public int flags = 0;
    public short fileOffset = 0;
    public short fileExtension = 0;
    public String defExt = null;
    public IntPtr custData = IntPtr.Zero;
    public IntPtr hook = IntPtr.Zero;
    public String templateName = null;
    public IntPtr reservedPtr = IntPtr.Zero;
    public int reservedInt = 0;
    public int flagsEx = 0;
}
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public class OpenDialogDir
{
    public IntPtr hwndOwner = IntPtr.Zero;
    public IntPtr pidlRoot = IntPtr.Zero;
    public String pszDisplayName = null;
    public String lpszTitle = null;
    public UInt32 ulFlags = 0;
    public IntPtr lpfn = IntPtr.Zero;
    public IntPtr lParam = IntPtr.Zero;
    public int iImage = 0;
}
public class DllOpenFileDialog
{
    [DllImport("Comdlg32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
    public static extern bool GetOpenFileName([In, Out] OpenDialogFile ofn);

    [DllImport("Comdlg32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
    public static extern bool GetSaveFileName([In, Out] OpenDialogFile ofn);

    [DllImport("shell32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
    public static extern IntPtr SHBrowseForFolder([In, Out] OpenDialogDir ofn);

    [DllImport("shell32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
    public static extern bool SHGetPathFromIDList([In] IntPtr pidl, [In, Out] char[] fileName);

}

创建控制脚本TestManager.cs，挂载任意物体

using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Runtime.InteropServices;
using System.Text;
using UnityEngine;

public class TestManager : MonoBehaviour
{
    [DllImport("Project1")]
    private static extern int DecryptQm(ref StringBuilder ptrStr);
    void Start()
    {
        string folder=OpenWindowsDialog();
        DirectoryInfo directoryInfo = new DirectoryInfo(folder);
        FileInfo[] fileInfos = directoryInfo.GetFiles("*", SearchOption.AllDirectories);
        foreach (FileInfo item in fileInfos)
        {
            if (item.Name.EndsWith("qmcflac")|| item.Name.EndsWith("qmc0") || item.Name.EndsWith("qmc3"))
            {
                  StringBuilder str = new StringBuilder(item.FullName);
                  DecryptQm(ref str);
            }
        }
    }
    public string OpenWindowsDialog()
    {
        OpenDialogDir ofn2 = new OpenDialogDir();
        ofn2.pszDisplayName = new string(new char[2000]); ; // 存放目录路径缓冲区
        ofn2.lpszTitle = "Open Music Folder";// 标题
        IntPtr pidlPtr = DllOpenFileDialog.SHBrowseForFolder(ofn2);
        char[] charArray = new char[2000];
        for (int i = 0; i < 2000; i++)
            charArray[i] = '\0';
        DllOpenFileDialog.SHGetPathFromIDList(pidlPtr, charArray);
        string fullDirPath = new String(charArray);
        fullDirPath = fullDirPath.Substring(0, fullDirPath.IndexOf('\0'));
        return fullDirPath;//这个就是选择的目录路径。
    }
}

运行一下，会自动把这个目录下所有符合解密条件的文件解密

已知问题：暂时不支持有中文文件名的歌曲
施工完毕！

【声明：本文仅为代码研究使用，严禁用于侵权等非法行为】

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