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refactor: restore support for QMCv1. 

(cherry picked from commit 19239f182d71e2e4362309f08706a91c00bb6bd1)
20230320
Jixun Wu 3 years ago
committed by MengYX
parent
ab3f54cb47
commit
ec6be66cc1
No known key found for this signature in database GPG Key ID: E63F9C7303E8F604
2 changed files with 91 additions and 93 deletions
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  1. 75
      src/decrypt/qmc.ts
  2. 109
      src/decrypt/qmcv2.ts

75
src/decrypt/qmc.ts
View File

@ -1,4 +1,4 @@
import {QmcMask, QmcMaskDetectMflac, QmcMaskDetectMgg, QmcMaskGetDefault} from "./qmcMask";
import {QmcMask, QmcMaskGetDefault} from "./qmcMask";
import {toByteArray as Base64Decode} from 'base64-js'
import {
AudioMimeType,
@ -9,7 +9,7 @@ import {
SniffAudioExt, WriteMetaToFlac, WriteMetaToMp3
} from "@/decrypt/utils";
import {parseBlob as metaParseBlob} from "music-metadata-browser";
import {decryptMGG} from "./qmcv2";
import {DecryptQMCv2} from "./qmcv2";
import iconv from "iconv-lite";
@ -18,60 +18,49 @@ import {queryAlbumCover, queryKeyInfo, reportKeyUsage} from "@/utils/api";
interface Handler {
ext: string
detect: boolean
handler(data?: Uint8Array): QmcMask | undefined
version: number
}
export const HandlerMap: { [key: string]: Handler } = {
"mgg": {handler: QmcMaskDetectMgg, ext: "ogg", detect: true},
"mflac": {handler: QmcMaskDetectMflac, ext: "flac", detect: true},
"mgg.cache": {handler: QmcMaskDetectMgg, ext: "ogg", detect: false},
"mflac.cache": {handler: QmcMaskDetectMflac, ext: "flac", detect: false},
"qmc0": {handler: QmcMaskGetDefault, ext: "mp3", detect: false},
"qmc2": {handler: QmcMaskGetDefault, ext: "ogg", detect: false},
"qmc3": {handler: QmcMaskGetDefault, ext: "mp3", detect: false},
"qmcogg": {handler: QmcMaskGetDefault, ext: "ogg", detect: false},
"qmcflac": {handler: QmcMaskGetDefault, ext: "flac", detect: false},
"bkcmp3": {handler: QmcMaskGetDefault, ext: "mp3", detect: false},
"bkcflac": {handler: QmcMaskGetDefault, ext: "flac", detect: false},
"tkm": {handler: QmcMaskGetDefault, ext: "m4a", detect: false},
"666c6163": {handler: QmcMaskGetDefault, ext: "flac", detect: false},
"6d7033": {handler: QmcMaskGetDefault, ext: "mp3", detect: false},
"6f6767": {handler: QmcMaskGetDefault, ext: "ogg", detect: false},
"6d3461": {handler: QmcMaskGetDefault, ext: "m4a", detect: false},
"776176": {handler: QmcMaskGetDefault, ext: "wav", detect: false}
"mgg": {ext: "ogg", version: 2},
"mgg1": {ext: "ogg", version: 2},
"mflac": {ext: "flac", version: 2},
"mflac0": {ext: "flac", version: 2},
"qmc0": {ext: "mp3", version: 1},
"qmc2": {ext: "ogg", version: 1},
"qmc3": {ext: "mp3", version: 1},
"qmcogg": {ext: "ogg", version: 1},
"qmcflac": {ext: "flac", version: 1},
"bkcmp3": {ext: "mp3", version: 1},
"bkcflac": {ext: "flac", version: 1},
"tkm": {ext: "m4a", version: 1},
"666c6163": {ext: "flac", version: 1},
"6d7033": {ext: "mp3", version: 1},
"6f6767": {ext: "ogg", version: 1},
"6d3461": {ext: "m4a", version: 1},
"776176": {ext: "wav", version: 1}
};
function mergeUint8(array: Uint8Array[]): Uint8Array {
// Get the total length of all arrays.
let length = 0;
array.forEach(item => {
length += item.length;
});
// Create a new array with total length and merge all source arrays.
let mergedArray = new Uint8Array(length);
let offset = 0;
array.forEach(item => {
mergedArray.set(item, offset);
offset += item.length;
});
return mergedArray;
}
export async function Decrypt(file: Blob, raw_filename: string, raw_ext: string): Promise<DecryptResult> {
if (!(raw_ext in HandlerMap)) throw `Qmc cannot handle type: ${raw_ext}`;
const handler = HandlerMap[raw_ext];
const decodedParts = await decryptMGG(await file.arrayBuffer());
let musicDecoded = mergeUint8(decodedParts);
const fileBuffer = await GetArrayBuffer(file);
let musicDecoded: Uint8Array;
if (handler.version === 1) {
const seed = QmcMaskGetDefault();
musicDecoded = seed.Decrypt(new Uint8Array(fileBuffer));
} else if (handler.version === 2) {
musicDecoded = await DecryptQMCv2(fileBuffer);
} else {
throw new Error(`不支持的加密版本: ${handler.version} (${raw_ext})`);
}
const ext = SniffAudioExt(musicDecoded, handler.ext);
const mime = AudioMimeType[ext];
let musicBlob = new Blob(decodedParts, {type: mime});
let musicBlob = new Blob([musicDecoded], {type: mime});
const musicMeta = await metaParseBlob(musicBlob);
for (let metaIdx in musicMeta.native) {

109
src/decrypt/qmcv2.ts
View File

@ -1,21 +1,36 @@
import QMCCryptoModule from '@jixun/qmc2-crypto/QMC2-wasm-bundle';
// EOF Magic detection.
// 检测文件末端使用的缓冲区大小
const DETECTION_SIZE = 40;
// Process in 2m buffer size
// 每次处理 2M 的数据
const DECRYPTION_BUF_SIZE = 2 * 1024 * 1024;
function MergeUint8Array(array: Uint8Array[]): Uint8Array {
let length = 0;
array.forEach(item => {
length += item.length;
});
let mergedArray = new Uint8Array(length);
let offset = 0;
array.forEach(item => {
mergedArray.set(item, offset);
offset += item.length;
});
return mergedArray;
}
/**
* 解密一个 QMC2 加密的文件。
*
* 如果检测并解密成功，返回解密后的 Uint8Array 数组，按顺序拼接即可得到完整文件。
* 若失败，返回 `null`。
* 如果检测并解密成功，返回解密后的 Uint8Array 数据。
* @param {ArrayBuffer} mggBlob 读入的文件 Blob
* @param {string} name 文件名
* @return {Promise<Uint8Array[]|null>}
* @return {Promise<Uint8Array|null>}
*/
export async function decryptMGG(mggBlob: ArrayBuffer) {
export async function DecryptQMCv2(mggBlob: ArrayBuffer) {
// 初始化模组
const QMCCrypto = await QMCCryptoModule();
@ -44,52 +59,46 @@ export async function decryptMGG(mggBlob: ArrayBuffer) {
QMCCrypto._free(pDetectionBuf);
QMCCrypto._free(pDetectionResult);
if (detectOK) {
// 计算解密后文件的大小。
// 之前得到的 position 为相对当前检测数据起点的偏移。
const decryptedSize = mggBlob.byteLength - DETECTION_SIZE + position;
// $prog.max = decryptedSize;
if (!detectOK) {
throw new Error("解密失败: \n " + detectionError);
}
// 计算解密后文件的大小。
// 之前得到的 position 为相对当前检测数据起点的偏移。
const decryptedSize = mggBlob.byteLength - DETECTION_SIZE + position;
// 提取嵌入到文件的 EKey
const ekey = new Uint8Array(
mggBlob.slice(decryptedSize, decryptedSize + len)
// 提取嵌入到文件的 EKey
const ekey = new Uint8Array(
mggBlob.slice(decryptedSize, decryptedSize + len)
);
// 解码 UTF-8 数据到 string
const decoder = new TextDecoder();
const ekey_b64 = decoder.decode(ekey);
// 初始化加密与缓冲区
const hCrypto = QMCCrypto.createInstWidthEKey(ekey_b64);
const buf = QMCCrypto._malloc(DECRYPTION_BUF_SIZE);
const decryptedParts = [];
let offset = 0;
let bytesToDecrypt = decryptedSize;
while (bytesToDecrypt > 0) {
const blockSize = Math.min(bytesToDecrypt, DECRYPTION_BUF_SIZE);
// 解密一些片段
const blockData = new Uint8Array(
mggBlob.slice(offset, offset + blockSize)
);
QMCCrypto.writeArrayToMemory(blockData, buf);
QMCCrypto.decryptStream(hCrypto, buf, offset, blockSize);
decryptedParts.push(QMCCrypto.HEAPU8.slice(buf, buf + blockSize));
// 解码 UTF-8 数据到 string
const decoder = new TextDecoder();
const ekey_b64 = decoder.decode(ekey);
// 初始化加密与缓冲区
const hCrypto = QMCCrypto.createInstWidthEKey(ekey_b64);
const buf = QMCCrypto._malloc(DECRYPTION_BUF_SIZE);
const decryptedParts = [];
let offset = 0;
let bytesToDecrypt = decryptedSize;
while (bytesToDecrypt > 0) {
const blockSize = Math.min(bytesToDecrypt, DECRYPTION_BUF_SIZE);
// 解密一些片段
const blockData = new Uint8Array(
mggBlob.slice(offset, offset + blockSize)
);
QMCCrypto.writeArrayToMemory(blockData, buf);
QMCCrypto.decryptStream(hCrypto, buf, offset, blockSize);
decryptedParts.push(QMCCrypto.HEAPU8.slice(buf, buf + blockSize));
offset += blockSize;
bytesToDecrypt -= blockSize;
// $prog.value = offset;
// 避免网页卡死，让 event loop 处理一下其它事件。
// Worker 应该不需要等待也可以？
// await new Promise((resolve) => setTimeout(resolve));
}
QMCCrypto._free(buf);
hCrypto.delete();
return decryptedParts;
} else {
throw new Error("ERROR: could not decrypt\n " + detectionError);
offset += blockSize;
bytesToDecrypt -= blockSize;
}
QMCCrypto._free(buf);
hCrypto.delete();
return MergeUint8Array(decryptedParts);
}
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