feat(qmcv2): Experiment with qmc2-crypto
(cherry picked from commit c8eb1bc481347efb6d35e9122e17e624bde18772)
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11
package-lock.json
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11
package-lock.json
generated
@ -10,6 +10,7 @@
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"license": "MIT",
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"dependencies": {
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"@babel/preset-typescript": "^7.16.5",
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"@jixun/qmc2-crypto": "^0.0.5-R2",
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"base64-js": "^1.5.1",
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"browser-id3-writer": "^4.4.0",
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"core-js": "^3.16.0",
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@ -2980,6 +2981,11 @@
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"regenerator-runtime": "^0.13.3"
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}
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},
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"node_modules/@jixun/qmc2-crypto": {
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"version": "0.0.5-R2",
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"resolved": "https://registry.npmjs.org/@jixun/qmc2-crypto/-/qmc2-crypto-0.0.5-R2.tgz",
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"integrity": "sha512-omrsnXSx7BpOCY8Yla+xwil0bYz/4sj3qEFy4hu4JL/ujeWMzASKq9WnW+UHfSnLUw6EGstub+CoSXrFeRDfqQ=="
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},
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"node_modules/@mrmlnc/readdir-enhanced": {
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"version": "2.2.1",
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"resolved": "https://registry.npmjs.org/@mrmlnc/readdir-enhanced/-/readdir-enhanced-2.2.1.tgz",
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@ -23019,6 +23025,11 @@
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"regenerator-runtime": "^0.13.3"
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}
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},
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"@jixun/qmc2-crypto": {
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"version": "0.0.5-R2",
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"resolved": "https://registry.npmjs.org/@jixun/qmc2-crypto/-/qmc2-crypto-0.0.5-R2.tgz",
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"integrity": "sha512-omrsnXSx7BpOCY8Yla+xwil0bYz/4sj3qEFy4hu4JL/ujeWMzASKq9WnW+UHfSnLUw6EGstub+CoSXrFeRDfqQ=="
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},
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"@mrmlnc/readdir-enhanced": {
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"version": "2.2.1",
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"resolved": "https://registry.npmjs.org/@mrmlnc/readdir-enhanced/-/readdir-enhanced-2.2.1.tgz",
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@ -18,6 +18,7 @@
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},
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"dependencies": {
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"@babel/preset-typescript": "^7.16.5",
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"@jixun/qmc2-crypto": "^0.0.5-R2",
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"base64-js": "^1.5.1",
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"browser-id3-writer": "^4.4.0",
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"core-js": "^3.16.0",
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@ -9,6 +9,7 @@ import {
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SniffAudioExt, WriteMetaToFlac, WriteMetaToMp3
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} from "@/decrypt/utils";
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import {parseBlob as metaParseBlob} from "music-metadata-browser";
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import {decryptMGG} from "./qmcv2";
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import iconv from "iconv-lite";
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@ -42,31 +43,35 @@ export const HandlerMap: { [key: string]: Handler } = {
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"776176": {handler: QmcMaskGetDefault, ext: "wav", detect: false}
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};
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function mergeUint8(array: Uint8Array[]): Uint8Array {
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// Get the total length of all arrays.
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let length = 0;
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array.forEach(item => {
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length += item.length;
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});
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// Create a new array with total length and merge all source arrays.
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let mergedArray = new Uint8Array(length);
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let offset = 0;
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array.forEach(item => {
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mergedArray.set(item, offset);
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offset += item.length;
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});
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return mergedArray;
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}
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export async function Decrypt(file: Blob, raw_filename: string, raw_ext: string): Promise<DecryptResult> {
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if (!(raw_ext in HandlerMap)) throw `Qmc cannot handle type: ${raw_ext}`;
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const handler = HandlerMap[raw_ext];
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const fileData = new Uint8Array(await GetArrayBuffer(file));
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let audioData, seed, keyData;
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if (handler.detect) {
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const keyLen = new DataView(fileData.slice(fileData.length - 4).buffer).getUint32(0, true)
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const keyPos = fileData.length - 4 - keyLen;
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audioData = fileData.slice(0, keyPos);
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seed = handler.handler(audioData);
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keyData = fileData.slice(keyPos, keyPos + keyLen);
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if (!seed) seed = await queryKey(keyData, raw_filename, raw_ext);
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if (!seed) throw raw_ext + "格式仅提供实验性支持";
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} else {
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audioData = fileData;
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seed = handler.handler(audioData) as QmcMask;
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if (!seed) throw raw_ext + "格式仅提供实验性支持";
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}
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let musicDecoded = seed.Decrypt(audioData);
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const decodedParts = await decryptMGG(await file.arrayBuffer());
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let musicDecoded = mergeUint8(decodedParts);
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const ext = SniffAudioExt(musicDecoded, handler.ext);
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const mime = AudioMimeType[ext];
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let musicBlob = new Blob([musicDecoded], {type: mime});
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let musicBlob = new Blob(decodedParts, {type: mime});
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const musicMeta = await metaParseBlob(musicBlob);
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for (let metaIdx in musicMeta.native) {
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@ -80,8 +85,6 @@ export async function Decrypt(file: Blob, raw_filename: string, raw_ext: string)
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}
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const info = GetMetaFromFile(raw_filename, musicMeta.common.title, musicMeta.common.artist)
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if (keyData) reportKeyUsage(keyData, seed.getMatrix128(),
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raw_filename, raw_ext, info.title, info.artist, musicMeta.common.album).then().catch();
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let imgUrl = GetCoverFromFile(musicMeta);
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if (!imgUrl) {
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95
src/decrypt/qmcv2.ts
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95
src/decrypt/qmcv2.ts
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@ -0,0 +1,95 @@
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import QMCCryptoModule from '@jixun/qmc2-crypto';
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// EOF Magic detection.
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const DETECTION_SIZE = 40;
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// Process in 2m buffer size
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const DECRYPTION_BUF_SIZE = 2 * 1024 * 1024;
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/**
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* 解密一个 QMC2 加密的文件。
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*
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* 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。
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* 若失败，返回 `null`。
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* @param {ArrayBuffer} mggBlob 读入的文件 Blob
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* @param {string} name 文件名
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* @return {Promise<Uint8Array[]|null>}
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*/
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export async function decryptMGG(mggBlob: ArrayBuffer) {
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// 初始化模组
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const QMCCrypto = await QMCCryptoModule();
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// 申请内存块，并文件末端数据到 WASM 的内存堆
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const detectionBuf = new Uint8Array(mggBlob.slice(-DETECTION_SIZE));
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const pDetectionBuf = QMCCrypto._malloc(detectionBuf.length);
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QMCCrypto.writeArrayToMemory(detectionBuf, pDetectionBuf);
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// 检测结果内存块
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const pDetectionResult = QMCCrypto._malloc(QMCCrypto.sizeof_qmc_detection());
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// 进行检测
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const detectOK = QMCCrypto.detectKeyEndPosition(
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pDetectionResult,
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pDetectionBuf,
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detectionBuf.length
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);
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// 提取结构体内容：
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// (pos: i32; len: i32; error: char[??])
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const position = QMCCrypto.getValue(pDetectionResult, "i32");
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const len = QMCCrypto.getValue(pDetectionResult + 4, "i32");
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const detectionError = QMCCrypto.UTF8ToString(pDetectionResult + 8);
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// 释放内存
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QMCCrypto._free(pDetectionBuf);
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QMCCrypto._free(pDetectionResult);
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if (detectOK) {
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// 计算解密后文件的大小。
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// 之前得到的 position 为相对当前检测数据起点的偏移。
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const decryptedSize = mggBlob.byteLength - DETECTION_SIZE + position;
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// $prog.max = decryptedSize;
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// 提取嵌入到文件的 EKey
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const ekey = new Uint8Array(
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mggBlob.slice(decryptedSize, decryptedSize + len)
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);
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// 解码 UTF-8 数据到 string
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const decoder = new TextDecoder();
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const ekey_b64 = decoder.decode(ekey);
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// 初始化加密与缓冲区
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const hCrypto = QMCCrypto.createInstWidthEKey(ekey_b64);
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const buf = QMCCrypto._malloc(DECRYPTION_BUF_SIZE);
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const decryptedParts = [];
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let offset = 0;
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let bytesToDecrypt = decryptedSize;
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while (bytesToDecrypt > 0) {
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const blockSize = Math.min(bytesToDecrypt, DECRYPTION_BUF_SIZE);
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// 解密一些片段
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const blockData = new Uint8Array(
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mggBlob.slice(offset, offset + blockSize)
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);
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QMCCrypto.writeArrayToMemory(blockData, buf);
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QMCCrypto.decryptStream(hCrypto, buf, offset, blockSize);
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decryptedParts.push(QMCCrypto.HEAPU8.slice(buf, buf + blockSize));
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offset += blockSize;
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bytesToDecrypt -= blockSize;
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// $prog.value = offset;
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// 避免网页卡死，让 event loop 处理一下其它事件。
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// Worker 应该不需要等待也可以？
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// await new Promise((resolve) => setTimeout(resolve));
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}
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QMCCrypto._free(buf);
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hCrypto.delete();
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return decryptedParts;
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} else {
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throw new Error("ERROR: could not decrypt\n " + detectionError);
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}
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}
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