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refactor(decrypt/qmc): typescript qmc mask

20230320
Emmm Monster 4 years ago
parent
15dba7b92f
commit
aca1c11332
No known key found for this signature in database GPG Key ID: C98279C83FB50DB9
2 changed files with 69 additions and 136 deletions
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  1. 6
      src/decrypt/qmc.js
  2. 199
      src/decrypt/qmcMask.ts

6
src/decrypt/qmc.js
View File

@ -1,4 +1,4 @@
import {QmcMaskCreate58, QmcMaskDetectMflac, QmcMaskDetectMgg, QmcMaskGetDefault} from "./qmcMask";
import {QmcMask, QmcMaskDetectMflac, QmcMaskDetectMgg, QmcMaskGetDefault} from "./qmcMask";
import {fromByteArray as Base64Encode, toByteArray as Base64Decode} from 'base64-js'
import {
AudioMimeType,
@ -68,7 +68,7 @@ export async function Decrypt(file, raw_filename, raw_ext) {
}
const info = GetMetaFromFile(raw_filename, musicMeta.common.title, musicMeta.common.artist)
if (handler.detect) reportKeyUsage(keyData, seed.Matrix128,
if (handler.detect) reportKeyUsage(keyData, seed.getMatrix128(),
info.artist, info.title, musicMeta.common.album, raw_filename, raw_ext);
let imgUrl = GetCoverFromFile(musicMeta);
@ -126,7 +126,7 @@ async function queryKeyInfo(keyData, filename, format) {
body: JSON.stringify({Format: format, Key: Base64Encode(keyData), Filename: filename, Type: 44}),
});
let data = await resp.json();
return QmcMaskCreate58(Base64Decode(data.Matrix44));
return new QmcMask(Base64Decode(data.Matrix44));
} catch (e) {
console.log(e);
}

199
src/decrypt/qmcMask.js → src/decrypt/qmcMask.ts
View File

@ -1,4 +1,4 @@
import {BytesEquals, BytesHasPrefix, FLAC_HEADER, OGG_HEADER} from "@/decrypt/utils.ts";
import {BytesHasPrefix, FLAC_HEADER, OGG_HEADER} from "@/decrypt/utils.ts";
const QMOggPublicHeader1 = [
0x4f, 0x67, 0x67, 0x53, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff,
@ -35,96 +35,65 @@ const QMCDefaultMaskMatrix = [
0xf9, 0xbc, 0x00, 0x11];
class QmcMask {
constructor(matrix, superA, superB) {
if (superA === undefined || superB === undefined) {
if (matrix.length === 44) {
this.Matrix44 = matrix
this.generateMask128from44()
} else {
this.Matrix128 = matrix
this.generateMask44from128()
}
this.generateMask58from128()
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 {
this.Matrix58 = matrix;
this.Super58A = superA;
this.Super58B = superB;
this.generateMask128from58();
this.generateMask44from128()
AllMapping[realIdx] = [i]
}
}
generateMask128from58() {
if (this.Matrix58.length !== 56) throw "incorrect mask58 matrix length";
let matrix128 = [];
for (let rowIdx = 0; rowIdx < 8; rowIdx += 1) {
matrix128 = matrix128.concat(
[this.Super58A],
this.Matrix58.slice(7 * rowIdx, 7 * rowIdx + 7),
[this.Super58B],
this.Matrix58.slice(56 - 7 - 7 * rowIdx, 56 - 7 * rowIdx).reverse()
);
}
this.Matrix128 = matrix128;
}
let idx44 = 0
AllMapping.forEach(all128 => {
all128.forEach(_i128 => {
Mask128to44[_i128] = idx44
})
idx44++
})
})();
generateMask58from128() {
if (this.Matrix128.length !== 128) throw "incorrect mask128 length";
const superA = this.Matrix128[0], superB = this.Matrix128[8];
let matrix58 = [];
export class QmcMask {
private readonly Matrix128: number[];
for (let rowIdx = 0; rowIdx < 8; rowIdx += 1) {
let lenStart = 16 * rowIdx;
let lenRightStart = 120 - lenStart;
if (this.Matrix128[lenStart] !== superA || this.Matrix128[lenStart + 8] !== superB) {
throw "decode mask-128 to mask-58 failed"
}
let rowLeft = this.Matrix128.slice(lenStart + 1, lenStart + 8);
let rowRight = this.Matrix128.slice(lenRightStart + 1, lenRightStart + 8).reverse();
if (BytesEquals(rowLeft, rowRight)) {
matrix58 = matrix58.concat(rowLeft);
} else {
throw "decode mask-128 to mask-58 failed"
}
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")
}
this.Matrix58 = matrix58;
this.Super58A = superA;
this.Super58B = superB;
}
generateMask44from128() {
if (this.Matrix128.length !== 128) throw "incorrect mask128 matrix length";
let mapping = GetConvertMapping()
this.Matrix44 = []
getMatrix128() {
return this.Matrix128
}
getMatrix44(): number[] {
const matrix44: number[] = []
let idxI44 = 0
mapping.forEach(it256 => {
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"
}
}
this.Matrix44[idxI44] = this.Matrix128[it256[0]]
matrix44[idxI44] = this.Matrix128[it256[0]]
idxI44++
})
return matrix44
}
generateMask128from44() {
if (this.Matrix44.length !== 44) throw "incorrect mask length"
this.Matrix128 = []
let idx44 = 0
GetConvertMapping().forEach(it256 => {
it256.forEach(m => {
this.Matrix128[m] = this.Matrix44[idx44]
})
idx44++
})
}
Decrypt(data) {
Decrypt(data: Uint8Array) {
if (!this.Matrix128) throw Error("bad call sequence")
let dst = data.slice(0);
let index = -1;
let maskIdx = -1;
@ -140,13 +109,25 @@ class QmcMask {
}
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)
}
export function QmcMaskDetectMflac(data) {
export function QmcMaskDetectMflac(data: Uint8Array) {
let search_len = Math.min(0x8000, data.length), mask;
for (let block_idx = 0; block_idx < search_len; block_idx += 128) {
try {
@ -160,9 +141,9 @@ export function QmcMaskDetectMflac(data) {
return mask;
}
export function QmcMaskDetectMgg(data) {
export function QmcMaskDetectMgg(data: Uint8Array) {
if (data.length < 0x100) return
let matrixConfidence = {};
let matrixConfidence: { [key: number]: { [key: number]: number } } = {};
for (let i = 0; i < 44; i++) matrixConfidence[i] = {};
const page2 = data[0x54] ^ data[0xC] ^ QMOggPublicHeader1[0xC];
@ -171,7 +152,7 @@ export function QmcMaskDetectMgg(data) {
for (let idx128 = 0; idx128 < spHeader.length; idx128++) {
if (spConf[idx128] === 0) continue;
let idx44 = GetMask44Index(idx128);
let idx44 = Mask128to44[idx128 % 128];
let _m = data[idx128] ^ spHeader[idx128]
let confidence = spConf[idx128];
if (_m in matrixConfidence[idx44]) {
@ -183,7 +164,7 @@ export function QmcMaskDetectMgg(data) {
let matrix = [];
try {
for (let i = 0; i < 44; i++)
matrix[i] = getMaskConfidenceResult(matrixConfidence[i]);
matrix[i] = calcMaskFromConfidence(matrixConfidence[i]);
} catch (e) {
return;
}
@ -191,82 +172,34 @@ export function QmcMaskDetectMgg(data) {
if (!BytesHasPrefix(mask.Decrypt(data.slice(0, OGG_HEADER.length)), OGG_HEADER)) {
return;
}
return mask;
}
export function QmcMaskCreate128(mask128) {
return new QmcMask(mask128)
}
export function QmcMaskCreate58(matrix, superA, superB) {
return new QmcMask(matrix, superA, superB)
}
export function QmcMaskCreate44(mask44) {
return new QmcMask(mask44)
}
/**
* @param confidence {{}}
* @returns {number}
*/
function getMaskConfidenceResult(confidence) {
if (confidence.length === 0) throw "can not match at least one key";
if (confidence.length > 1) console.warn("There are 2 potential value for the mask!")
let result, conf = 0;
function calcMaskFromConfidence(confidence: { [key: number]: number }) {
console.log(confidence)
const count = Object.keys(confidence).length
if (count === 0) throw "can not match at least one key";
if (count > 1) console.warn("There are 2 potential value for the mask!")
let result = ""
let conf = 0
for (let idx in confidence) {
if (confidence[idx] > conf) {
result = idx;
conf = confidence[idx];
}
}
return parseInt(result)
}
/**
* @return {number}
*/
const allMapping = [];
const mask128to44 = [];
(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++
})
})();
function GetConvertMapping() {
return allMapping;
}
function GetMask44Index(idx128) {
return mask128to44[idx128 % 128]
return Number(result)
}
function QmcGenerateOggHeader(page2) {
function QmcGenerateOggHeader(page2: number) {
let spec = [page2, 0xFF]
for (let i = 2; i < page2; i++) spec.push(0xFF)
spec.push(0xFF)
return QMOggPublicHeader1.concat(spec, QMOggPublicHeader2)
}
function QmcGenerateOggConf(page2) {
function QmcGenerateOggConf(page2: number) {
let specConf = [6, 0]
for (let i = 2; i < page2; i++) specConf.push(4)
specConf.push(0)
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