380 lines
8.9 KiB
C++
380 lines
8.9 KiB
C++
#include "ncmcrypt.h"
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#include "aes.h"
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#include "base64.h"
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#include "cJSON.h"
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#define TAGLIB_STATIC
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#include <taglib/mpegfile.h>
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#include <taglib/flacfile.h>
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#include <taglib/attachedpictureframe.h>
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#include <taglib/id3v2tag.h>
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#include <taglib/tag.h>
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#include <stdexcept>
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#include <string>
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const unsigned char NeteaseCrypt::sCoreKey[17] = {0x68, 0x7A, 0x48, 0x52, 0x41, 0x6D, 0x73, 0x6F, 0x35, 0x6B, 0x49, 0x6E, 0x62, 0x61, 0x78, 0x57, 0};
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const unsigned char NeteaseCrypt::sModifyKey[17] = {0x23, 0x31, 0x34, 0x6C, 0x6A, 0x6B, 0x5F, 0x21, 0x5C, 0x5D, 0x26, 0x30, 0x55, 0x3C, 0x27, 0x28, 0};
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const unsigned char NeteaseCrypt::mPng[8] = {0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A};
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static void aesEcbDecrypt(const unsigned char *key, std::string& src, std::string& dst) {
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int n, i;
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unsigned char out[16];
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n = src.length() >> 4;
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dst.clear();
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AES aes(key);
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for (i = 0; i < n-1; i++) {
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aes.decrypt((unsigned char*)src.c_str() + (i << 4), out);
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dst += std::string((char*)out, 16);
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}
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aes.decrypt((unsigned char*)src.c_str() + (i << 4), out);
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char pad = out[15];
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if (pad > 16) {
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pad = 0;
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}
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dst += std::string((char*)out, 16-pad);
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}
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static void replace(std::string& str, const std::string& from, const std::string& to) {
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if(from.empty())
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return;
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size_t start_pos = 0;
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while((start_pos = str.find(from, start_pos)) != std::string::npos) {
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str.replace(start_pos, from.length(), to);
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start_pos += to.length(); // In case 'to' contains 'from', like replacing 'x' with 'yx'
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}
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}
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static std::string fileNameWithoutExt(const std::string& str)
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{
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size_t lastPath = str.find_last_of("/\\");
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std::string path = str.substr(lastPath+1);
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size_t lastExt = path.find_last_of(".");
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return path.substr(0, lastExt);
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}
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NeteaseMusicMetadata::~NeteaseMusicMetadata() {
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cJSON_Delete(mRaw);
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}
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NeteaseMusicMetadata::NeteaseMusicMetadata(cJSON* raw) {
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if (!raw) {
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return;
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}
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cJSON *swap;
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int artistLen, i;
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mRaw = raw;
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swap = cJSON_GetObjectItem(raw, "musicName");
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if (swap) {
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mName = std::string(cJSON_GetStringValue(swap));
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}
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swap = cJSON_GetObjectItem(raw, "album");
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if (swap) {
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mAlbum = std::string(cJSON_GetStringValue(swap));
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}
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swap = cJSON_GetObjectItem(raw, "artist");
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if (swap) {
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artistLen = cJSON_GetArraySize(swap);
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i = 0;
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for (i = 0; i < artistLen-1; i++) {
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mArtist += std::string(cJSON_GetStringValue(cJSON_GetArrayItem(cJSON_GetArrayItem(swap, i), 0)));
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mArtist += "/";
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}
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mArtist += std::string(cJSON_GetStringValue(cJSON_GetArrayItem(cJSON_GetArrayItem(swap, i), 0)));
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}
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swap = cJSON_GetObjectItem(raw, "bitrate");
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if (swap) {
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mBitrate = swap->valueint;
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}
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swap = cJSON_GetObjectItem(raw, "duration");
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if (swap) {
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mDuration = swap->valueint;
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}
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swap = cJSON_GetObjectItem(raw, "format");
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if (swap) {
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mFormat = std::string(cJSON_GetStringValue(swap));
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}
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}
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bool NeteaseCrypt::openFile(std::string const& path) {
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mFile.open(path, std::ios::in | std::ios::binary);
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if (!mFile.is_open()) {
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return false;
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} else {
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return true;
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}
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}
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bool NeteaseCrypt::isNcmFile() {
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unsigned int header;
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mFile.read(reinterpret_cast<char *>(&header), sizeof(header));
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if (header != (unsigned int)0x4e455443) {
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return false;
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}
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mFile.read(reinterpret_cast<char *>(&header), sizeof(header));
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if (header != (unsigned int)0x4d414446) {
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return false;
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}
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return true;
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}
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int NeteaseCrypt::read(char *s, std::streamsize n) {
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mFile.read(s, n);
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int gcount = mFile.gcount();
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if (gcount <= 0) {
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throw std::invalid_argument(" can't read file");
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}
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return gcount;
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}
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void NeteaseCrypt::buildKeyBox(unsigned char *key, int keyLen) {
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int i;
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for (i = 0; i < 256; ++i) {
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mKeyBox[i] = (unsigned char)i;
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}
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unsigned char swap = 0;
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unsigned char c = 0;
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unsigned char last_byte = 0;
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unsigned char key_offset = 0;
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for (i = 0; i < 256; ++i)
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{
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swap = mKeyBox[i];
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c = ((swap + last_byte + key[key_offset++]) & 0xff);
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if (key_offset >= keyLen) key_offset = 0;
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mKeyBox[i] = mKeyBox[c]; mKeyBox[c] = swap;
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last_byte = c;
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}
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}
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std::string NeteaseCrypt::mimeType(std::string& data) {
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if (memcmp(data.c_str(), mPng, 8) == 0) {
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return std::string("image/png");
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}
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return std::string("image/jpeg");
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}
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void NeteaseCrypt::FixMetadata() {
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if (mDumpFilepath.length() <= 0) {
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throw std::invalid_argument("must dump before");
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}
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TagLib::File *audioFile;
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TagLib::Tag *tag;
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TagLib::ByteVector vector(mImageData.c_str(), mImageData.length());
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if (mFormat == NeteaseCrypt::MP3) {
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audioFile = new TagLib::MPEG::File(mDumpFilepath.c_str());
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tag = dynamic_cast<TagLib::MPEG::File*>(audioFile)->ID3v2Tag(true);
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if (mImageData.length() > 0) {
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TagLib::ID3v2::AttachedPictureFrame *frame = new TagLib::ID3v2::AttachedPictureFrame;
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frame->setMimeType(mimeType(mImageData));
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frame->setPicture(vector);
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dynamic_cast<TagLib::ID3v2::Tag*>(tag)->addFrame(frame);
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}
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} else if (mFormat == NeteaseCrypt::FLAC) {
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audioFile = new TagLib::FLAC::File(mDumpFilepath.c_str());
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tag = audioFile->tag();
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if (mImageData.length() > 0) {
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TagLib::FLAC::Picture *cover = new TagLib::FLAC::Picture;
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cover->setMimeType(mimeType(mImageData));
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cover->setType(TagLib::FLAC::Picture::FrontCover);
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cover->setData(vector);
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dynamic_cast<TagLib::FLAC::File*>(audioFile)->addPicture(cover);
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}
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}
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if (mMetaData != NULL) {
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tag->setTitle(TagLib::String(mMetaData->name(), TagLib::String::UTF8));
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tag->setArtist(TagLib::String(mMetaData->artist(), TagLib::String::UTF8));
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tag->setAlbum(TagLib::String(mMetaData->album(), TagLib::String::UTF8));
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}
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tag->setComment(TagLib::String("Create by netease copyright protected dump tool. author 5L", TagLib::String::UTF8));
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audioFile->save();
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}
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void NeteaseCrypt::Dump() {
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int n, i;
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// mDumpFilepath.clear();
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// mDumpFilepath.resize(1024);
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// if (mMetaData) {
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// mDumpFilepath = mMetaData->name();
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// replace(mDumpFilepath, "\\", "＼");
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// replace(mDumpFilepath, "/", "／");
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// replace(mDumpFilepath, "?", "？");
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// replace(mDumpFilepath, ":", "：");
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// replace(mDumpFilepath, "*", "＊");
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// replace(mDumpFilepath, "\"", "＂");
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// replace(mDumpFilepath, "<", "＜");
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// replace(mDumpFilepath, ">", "＞");
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// replace(mDumpFilepath, "|", "｜");
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// } else {
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mDumpFilepath = fileNameWithoutExt(mFilepath);
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// }
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n = 0x8000;
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i = 0;
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unsigned char buffer[n];
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std::ofstream output;
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while (!mFile.eof()) {
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n = read((char*)buffer, n);
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for (i = 0; i < n; i++) {
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int j = (i + 1) & 0xff;
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buffer[i] ^= mKeyBox[(mKeyBox[j] + mKeyBox[(mKeyBox[j] + j) & 0xff]) & 0xff];
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}
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if (!output.is_open()) {
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// identify format
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// ID3 format mp3
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if (buffer[0] == 0x49 && buffer[1] == 0x44 && buffer[2] == 0x33) {
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mDumpFilepath += ".mp3";
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mFormat = NeteaseCrypt::MP3;
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} else {
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mDumpFilepath += ".flac";
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mFormat = NeteaseCrypt::FLAC;
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}
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output.open(mDumpFilepath, output.out | output.binary);
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}
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output.write((char*)buffer, n);
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}
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output.flush();
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output.close();
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}
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NeteaseCrypt::~NeteaseCrypt() {
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if (mMetaData != NULL) {
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delete mMetaData;
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}
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mFile.close();
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}
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NeteaseCrypt::NeteaseCrypt(std::string const& path) {
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if (!openFile(path)) {
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throw std::invalid_argument(" can't open file");
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}
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if (!isNcmFile()) {
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throw std::invalid_argument(" not netease protected file");
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}
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if (!mFile.seekg(2, mFile.cur)) {
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throw std::invalid_argument(" can't seek file");
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}
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mFilepath = path;
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int i;
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unsigned int n;
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read(reinterpret_cast<char *>(&n), sizeof(n));
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if (n <= 0) {
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throw std::invalid_argument("broken ncm file");
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}
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char keydata[n];
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read(keydata, n);
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for (i = 0; i < n; i++) {
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keydata[i] ^= 0x64;
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}
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std::string rawKeyData(keydata, n);
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std::string mKeyData;
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aesEcbDecrypt(sCoreKey, rawKeyData, mKeyData);
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buildKeyBox((unsigned char*)mKeyData.c_str()+17, mKeyData.length()-17);
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read(reinterpret_cast<char *>(&n), sizeof(n));
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if (n <= 0) {
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printf("[Warn] `%s` missing metadata infomation can't fix some infomation!\n", path.c_str());
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mMetaData = NULL;
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} else {
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char modifyData[n];
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read(modifyData, n);
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for (i = 0; i < n; i++) {
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modifyData[i] ^= 0x63;
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}
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std::string swapModifyData;
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std::string modifyOutData;
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std::string modifyDecryptData;
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swapModifyData = std::string(modifyData + 22, n - 22);
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// escape `163 key(Don't modify):`
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Base64::Decode(swapModifyData, modifyOutData);
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aesEcbDecrypt(sModifyKey, modifyOutData, modifyDecryptData);
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// escape `music:`
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modifyDecryptData = std::string(modifyDecryptData.begin()+6, modifyDecryptData.end());
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// std::cout << modifyDecryptData << std::endl;
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mMetaData = new NeteaseMusicMetadata(cJSON_Parse(modifyDecryptData.c_str()));
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}
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// skip crc32 & unuse charset
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if (!mFile.seekg(9, mFile.cur)) {
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throw std::invalid_argument("can't seek file");
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}
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read(reinterpret_cast<char *>(&n), sizeof(n));
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if (n > 0) {
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char *imageData = (char*)malloc(n);
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read(imageData, n);
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mImageData = std::string(imageData, n);
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} else {
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printf("[Warn] `%s` missing album can't fix album image!\n", path.c_str());
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}
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}
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