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feat(qmcv2): Experiment with qmc2-crypto

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(cherry picked from commit c8eb1bc481347efb6d35e9122e17e624bde18772)
This commit is contained in:
鲁树人
2021-12-15 13:53:50 +00:00
parent ada078df19
commit 0a52d2a20b
4 changed files with 129 additions and 19 deletions
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41
src/decrypt/qmc.ts
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@@ -9,6 +9,7 @@ import {
SniffAudioExt, WriteMetaToFlac, WriteMetaToMp3
} from "@/decrypt/utils";
import {parseBlob as metaParseBlob} from "music-metadata-browser";
import {decryptMGG} from "./qmcv2";
import iconv from "iconv-lite";
@@ -42,31 +43,35 @@ export const HandlerMap: { [key: string]: Handler } = {
"776176": {handler: QmcMaskGetDefault, ext: "wav", detect: false}
};
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 fileData = new Uint8Array(await GetArrayBuffer(file));
let audioData, seed, keyData;
if (handler.detect) {
const keyLen = new DataView(fileData.slice(fileData.length - 4).buffer).getUint32(0, true)
const keyPos = fileData.length - 4 - keyLen;
audioData = fileData.slice(0, keyPos);
seed = handler.handler(audioData);
keyData = fileData.slice(keyPos, keyPos + keyLen);
if (!seed) seed = await queryKey(keyData, raw_filename, raw_ext);
if (!seed) throw raw_ext + "格式仅提供实验性支持";
} else {
audioData = fileData;
seed = handler.handler(audioData) as QmcMask;
if (!seed) throw raw_ext + "格式仅提供实验性支持";
}
let musicDecoded = seed.Decrypt(audioData);
const decodedParts = await decryptMGG(await file.arrayBuffer());
let musicDecoded = mergeUint8(decodedParts);
const ext = SniffAudioExt(musicDecoded, handler.ext);
const mime = AudioMimeType[ext];
let musicBlob = new Blob([musicDecoded], {type: mime});
let musicBlob = new Blob(decodedParts, {type: mime});
const musicMeta = await metaParseBlob(musicBlob);
for (let metaIdx in musicMeta.native) {
@@ -80,8 +85,6 @@ export async function Decrypt(file: Blob, raw_filename: string, raw_ext: string)
}
const info = GetMetaFromFile(raw_filename, musicMeta.common.title, musicMeta.common.artist)
if (keyData) reportKeyUsage(keyData, seed.getMatrix128(),
raw_filename, raw_ext, info.title, info.artist, musicMeta.common.album).then().catch();
let imgUrl = GetCoverFromFile(musicMeta);
if (!imgUrl) {