feat: use static cipher instead of mask
(cherry picked from commit cd6b84ad7eed489f9bcbd72d847cd4d704052b0c)
This commit is contained in:
MengYX
parent
cd3f4d8c22
commit
b4068e2edb
@ -1,12 +1,13 @@
|
||||
import {QmcMask, QmcMaskGetDefault} from "./qmcMask";
|
||||
import {toByteArray as Base64Decode} from 'base64-js'
|
||||
import {QmcStaticCipher} from "./qmc_cipher";
|
||||
import {
|
||||
AudioMimeType,
|
||||
GetArrayBuffer,
|
||||
GetCoverFromFile,
|
||||
GetImageFromURL,
|
||||
GetMetaFromFile,
|
||||
SniffAudioExt, WriteMetaToFlac, WriteMetaToMp3
|
||||
SniffAudioExt,
|
||||
WriteMetaToFlac,
|
||||
WriteMetaToMp3
|
||||
} from "@/decrypt/utils";
|
||||
import {parseBlob as metaParseBlob} from "music-metadata-browser";
|
||||
import {DecryptQMCv2} from "./qmcv2";
|
||||
@ -14,7 +15,7 @@ import {DecryptQMCv2} from "./qmcv2";
|
||||
|
||||
import iconv from "iconv-lite";
|
||||
import {DecryptResult} from "@/decrypt/entity";
|
||||
import {queryAlbumCover, queryKeyInfo, reportKeyUsage} from "@/utils/api";
|
||||
import {queryAlbumCover} from "@/utils/api";
|
||||
|
||||
interface Handler {
|
||||
ext: string
|
||||
@ -48,10 +49,10 @@ export const HandlerMap: { [key: string]: Handler } = {
|
||||
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];
|
||||
let { version } = handler;
|
||||
let {version} = handler;
|
||||
|
||||
const fileBuffer = await GetArrayBuffer(file);
|
||||
let musicDecoded: Uint8Array|undefined;
|
||||
let musicDecoded: Uint8Array | undefined;
|
||||
|
||||
if (version === 2) {
|
||||
const v2Decrypted = await DecryptQMCv2(fileBuffer);
|
||||
@ -64,8 +65,9 @@ export async function Decrypt(file: Blob, raw_filename: string, raw_ext: string)
|
||||
}
|
||||
|
||||
if (version === 1) {
|
||||
const seed = QmcMaskGetDefault();
|
||||
musicDecoded = seed.Decrypt(new Uint8Array(fileBuffer));
|
||||
const seed = new QmcStaticCipher();
|
||||
musicDecoded = new Uint8Array(fileBuffer)
|
||||
seed.decrypt(musicDecoded, 0);
|
||||
} else if (!musicDecoded) {
|
||||
throw new Error(`解密失败: ${raw_ext}`);
|
||||
}
|
||||
@ -125,15 +127,6 @@ export async function Decrypt(file: Blob, raw_filename: string, raw_ext: string)
|
||||
}
|
||||
|
||||
|
||||
async function queryKey(keyData: Uint8Array, filename: string, format: string): Promise<QmcMask | undefined> {
|
||||
try {
|
||||
const data = await queryKeyInfo(keyData, filename, format)
|
||||
return new QmcMask(Base64Decode(data.Matrix44));
|
||||
} catch (e) {
|
||||
console.warn(e);
|
||||
}
|
||||
}
|
||||
|
||||
async function getCoverImage(title: string, artist?: string, album?: string): Promise<string> {
|
||||
const song_query_url = "https://stats.ixarea.com/apis" + "/music/qq-cover"
|
||||
try {
|
||||
|
||||
@ -1,98 +0,0 @@
|
||||
const QMCDefaultMaskMatrix = [
|
||||
0xde, 0x51, 0xfa, 0xc3, 0x4a, 0xd6, 0xca, 0x90,
|
||||
0x7e, 0x67, 0x5e, 0xf7, 0xd5, 0x52, 0x84, 0xd8,
|
||||
0x47, 0x95, 0xbb, 0xa1, 0xaa, 0xc6, 0x66, 0x23,
|
||||
0x92, 0x62, 0xf3, 0x74, 0xa1, 0x9f, 0xf4, 0xa0,
|
||||
0x1d, 0x3f, 0x5b, 0xf0, 0x13, 0x0e, 0x09, 0x3d,
|
||||
0xf9, 0xbc, 0x00, 0x11];
|
||||
|
||||
const AllMapping: number[][] = [];
|
||||
const Mask128to44: number[] = [];
|
||||
|
||||
(function () {
|
||||
for (let i = 0; i < 128; i++) {
|
||||
let realIdx = (i * i + 27) % 256
|
||||
if (realIdx in AllMapping) {
|
||||
AllMapping[realIdx].push(i)
|
||||
} else {
|
||||
AllMapping[realIdx] = [i]
|
||||
}
|
||||
}
|
||||
|
||||
let idx44 = 0
|
||||
AllMapping.forEach(all128 => {
|
||||
all128.forEach(_i128 => {
|
||||
Mask128to44[_i128] = idx44
|
||||
})
|
||||
idx44++
|
||||
})
|
||||
})();
|
||||
|
||||
export class QmcMask {
|
||||
private readonly Matrix128: number[];
|
||||
|
||||
constructor(matrix: number[] | Uint8Array) {
|
||||
if (matrix instanceof Uint8Array) matrix = Array.from(matrix)
|
||||
if (matrix.length === 44) {
|
||||
this.Matrix128 = this._generate128(matrix)
|
||||
} else if (matrix.length === 128) {
|
||||
this.Matrix128 = matrix
|
||||
} else {
|
||||
throw Error("invalid mask length")
|
||||
}
|
||||
}
|
||||
|
||||
getMatrix128() {
|
||||
return this.Matrix128
|
||||
}
|
||||
|
||||
getMatrix44(): number[] {
|
||||
const matrix44: number[] = []
|
||||
let idxI44 = 0
|
||||
AllMapping.forEach(it256 => {
|
||||
let it256Len = it256.length
|
||||
for (let i = 1; i < it256Len; i++) {
|
||||
if (this.Matrix128[it256[0]] !== this.Matrix128[it256[i]]) {
|
||||
throw "decode mask-128 to mask-44 failed"
|
||||
}
|
||||
}
|
||||
matrix44[idxI44] = this.Matrix128[it256[0]]
|
||||
idxI44++
|
||||
})
|
||||
return matrix44
|
||||
}
|
||||
|
||||
Decrypt(data: Uint8Array) {
|
||||
if (!this.Matrix128) throw Error("bad call sequence")
|
||||
let dst = data.slice(0);
|
||||
let index = -1;
|
||||
let maskIdx = -1;
|
||||
for (let cur = 0; cur < data.length; cur++) {
|
||||
index++;
|
||||
maskIdx++;
|
||||
if (index === 0x8000 || (index > 0x8000 && (index + 1) % 0x8000 === 0)) {
|
||||
index++;
|
||||
maskIdx++;
|
||||
}
|
||||
if (maskIdx >= 128) maskIdx -= 128;
|
||||
dst[cur] ^= this.Matrix128[maskIdx];
|
||||
}
|
||||
return dst;
|
||||
}
|
||||
|
||||
private _generate128(matrix44: number[]): number[] {
|
||||
const matrix128: number[] = []
|
||||
let idx44 = 0
|
||||
AllMapping.forEach(it256 => {
|
||||
it256.forEach(m => {
|
||||
matrix128[m] = matrix44[idx44]
|
||||
})
|
||||
idx44++
|
||||
})
|
||||
return matrix128
|
||||
}
|
||||
}
|
||||
|
||||
export function QmcMaskGetDefault() {
|
||||
return new QmcMask(QMCDefaultMaskMatrix)
|
||||
}
|
||||
27
src/decrypt/qmc_cipher.test.ts
Normal file
27
src/decrypt/qmc_cipher.test.ts
Normal file
@ -0,0 +1,27 @@
|
||||
import {QmcStaticCipher} from "@/decrypt/qmc_cipher";
|
||||
|
||||
test("static cipher [0x7ff8,0x8000) ", () => {
|
||||
const expected = new Uint8Array([
|
||||
0xD8, 0x52, 0xF7, 0x67, 0x90, 0xCA, 0xD6, 0x4A,
|
||||
0x4A, 0xD6, 0xCA, 0x90, 0x67, 0xF7, 0x52, 0xD8,
|
||||
])
|
||||
|
||||
const c = new QmcStaticCipher()
|
||||
const buf = new Uint8Array(16)
|
||||
c.decrypt(buf, 0x7ff8)
|
||||
|
||||
expect(buf).toStrictEqual(expected)
|
||||
})
|
||||
|
||||
test("static cipher [0,0x10) ", () => {
|
||||
const expected = new Uint8Array([
|
||||
0xC3, 0x4A, 0xD6, 0xCA, 0x90, 0x67, 0xF7, 0x52,
|
||||
0xD8, 0xA1, 0x66, 0x62, 0x9F, 0x5B, 0x09, 0x00,
|
||||
])
|
||||
|
||||
const c = new QmcStaticCipher()
|
||||
const buf = new Uint8Array(16)
|
||||
c.decrypt(buf, 0)
|
||||
|
||||
expect(buf).toStrictEqual(expected)
|
||||
})
|
||||
53
src/decrypt/qmc_cipher.ts
Normal file
53
src/decrypt/qmc_cipher.ts
Normal file
@ -0,0 +1,53 @@
|
||||
const staticCipherBox = new Uint8Array([
|
||||
0x77, 0x48, 0x32, 0x73, 0xDE, 0xF2, 0xC0, 0xC8, //0x00
|
||||
0x95, 0xEC, 0x30, 0xB2, 0x51, 0xC3, 0xE1, 0xA0, //0x08
|
||||
0x9E, 0xE6, 0x9D, 0xCF, 0xFA, 0x7F, 0x14, 0xD1, //0x10
|
||||
0xCE, 0xB8, 0xDC, 0xC3, 0x4A, 0x67, 0x93, 0xD6, //0x18
|
||||
0x28, 0xC2, 0x91, 0x70, 0xCA, 0x8D, 0xA2, 0xA4, //0x20
|
||||
0xF0, 0x08, 0x61, 0x90, 0x7E, 0x6F, 0xA2, 0xE0, //0x28
|
||||
0xEB, 0xAE, 0x3E, 0xB6, 0x67, 0xC7, 0x92, 0xF4, //0x30
|
||||
0x91, 0xB5, 0xF6, 0x6C, 0x5E, 0x84, 0x40, 0xF7, //0x38
|
||||
0xF3, 0x1B, 0x02, 0x7F, 0xD5, 0xAB, 0x41, 0x89, //0x40
|
||||
0x28, 0xF4, 0x25, 0xCC, 0x52, 0x11, 0xAD, 0x43, //0x48
|
||||
0x68, 0xA6, 0x41, 0x8B, 0x84, 0xB5, 0xFF, 0x2C, //0x50
|
||||
0x92, 0x4A, 0x26, 0xD8, 0x47, 0x6A, 0x7C, 0x95, //0x58
|
||||
0x61, 0xCC, 0xE6, 0xCB, 0xBB, 0x3F, 0x47, 0x58, //0x60
|
||||
0x89, 0x75, 0xC3, 0x75, 0xA1, 0xD9, 0xAF, 0xCC, //0x68
|
||||
0x08, 0x73, 0x17, 0xDC, 0xAA, 0x9A, 0xA2, 0x16, //0x70
|
||||
0x41, 0xD8, 0xA2, 0x06, 0xC6, 0x8B, 0xFC, 0x66, //0x78
|
||||
0x34, 0x9F, 0xCF, 0x18, 0x23, 0xA0, 0x0A, 0x74, //0x80
|
||||
0xE7, 0x2B, 0x27, 0x70, 0x92, 0xE9, 0xAF, 0x37, //0x88
|
||||
0xE6, 0x8C, 0xA7, 0xBC, 0x62, 0x65, 0x9C, 0xC2, //0x90
|
||||
0x08, 0xC9, 0x88, 0xB3, 0xF3, 0x43, 0xAC, 0x74, //0x98
|
||||
0x2C, 0x0F, 0xD4, 0xAF, 0xA1, 0xC3, 0x01, 0x64, //0xA0
|
||||
0x95, 0x4E, 0x48, 0x9F, 0xF4, 0x35, 0x78, 0x95, //0xA8
|
||||
0x7A, 0x39, 0xD6, 0x6A, 0xA0, 0x6D, 0x40, 0xE8, //0xB0
|
||||
0x4F, 0xA8, 0xEF, 0x11, 0x1D, 0xF3, 0x1B, 0x3F, //0xB8
|
||||
0x3F, 0x07, 0xDD, 0x6F, 0x5B, 0x19, 0x30, 0x19, //0xC0
|
||||
0xFB, 0xEF, 0x0E, 0x37, 0xF0, 0x0E, 0xCD, 0x16, //0xC8
|
||||
0x49, 0xFE, 0x53, 0x47, 0x13, 0x1A, 0xBD, 0xA4, //0xD0
|
||||
0xF1, 0x40, 0x19, 0x60, 0x0E, 0xED, 0x68, 0x09, //0xD8
|
||||
0x06, 0x5F, 0x4D, 0xCF, 0x3D, 0x1A, 0xFE, 0x20, //0xE0
|
||||
0x77, 0xE4, 0xD9, 0xDA, 0xF9, 0xA4, 0x2B, 0x76, //0xE8
|
||||
0x1C, 0x71, 0xDB, 0x00, 0xBC, 0xFD, 0x0C, 0x6C, //0xF0
|
||||
0xA5, 0x47, 0xF7, 0xF6, 0x00, 0x79, 0x4A, 0x11, //0xF8
|
||||
])
|
||||
|
||||
interface streamCipher {
|
||||
decrypt(buf: Uint8Array, offset: number): void
|
||||
}
|
||||
|
||||
export class QmcStaticCipher implements streamCipher {
|
||||
|
||||
public getMask(offset: number) {
|
||||
if (offset > 0x7FFF) offset %= 0x7FFF
|
||||
return staticCipherBox[(offset * offset + 27) & 0xff]
|
||||
}
|
||||
|
||||
public decrypt(buf: Uint8Array, offset: number) {
|
||||
for (let i = 0; i < buf.length; i++) {
|
||||
buf[i] ^= this.getMask(offset + i)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
@ -27,7 +27,6 @@ function MergeUint8Array(array: Uint8Array[]): Uint8Array {
|
||||
*
|
||||
* 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|false>}
|
||||
*/
|
||||
export async function DecryptQMCv2(mggBlob: ArrayBuffer) {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user