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refactor(decrypt/qmc): typescript qmc mask

This commit is contained in:
Emmm Monster 2021-05-24 05:57:04 +08:00
parent 15dba7b92f
commit aca1c11332
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GPG Key ID: C98279C83FB50DB9
2 changed files with 69 additions and 136 deletions
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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 {fromByteArray as Base64Encode, toByteArray as Base64Decode} from 'base64-js'
import { import {
AudioMimeType, 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) 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); info.artist, info.title, musicMeta.common.album, raw_filename, raw_ext);
let imgUrl = GetCoverFromFile(musicMeta); 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}), body: JSON.stringify({Format: format, Key: Base64Encode(keyData), Filename: filename, Type: 44}),
}); });
let data = await resp.json(); let data = await resp.json();
return QmcMaskCreate58(Base64Decode(data.Matrix44)); return new QmcMask(Base64Decode(data.Matrix44));
} catch (e) { } catch (e) {
console.log(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 = [ const QMOggPublicHeader1 = [
0x4f, 0x67, 0x67, 0x53, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 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]; 0xf9, 0xbc, 0x00, 0x11];
class QmcMask { const AllMapping: number[][] = [];
constructor(matrix, superA, superB) { const Mask128to44: number[] = [];
if (superA === undefined || superB === undefined) {
if (matrix.length === 44) { (function () {
this.Matrix44 = matrix for (let i = 0; i < 128; i++) {
this.generateMask128from44() let realIdx = (i * i + 27) % 256
} else { if (realIdx in AllMapping) {
this.Matrix128 = matrix AllMapping[realIdx].push(i)
this.generateMask44from128()
}
this.generateMask58from128()
} else { } else {
this.Matrix58 = matrix; AllMapping[realIdx] = [i]
this.Super58A = superA;
this.Super58B = superB;
this.generateMask128from58();
this.generateMask44from128()
} }
} }
generateMask128from58() { let idx44 = 0
if (this.Matrix58.length !== 56) throw "incorrect mask58 matrix length"; AllMapping.forEach(all128 => {
all128.forEach(_i128 => {
Mask128to44[_i128] = idx44
})
idx44++
})
})();
let matrix128 = [];
for (let rowIdx = 0; rowIdx < 8; rowIdx += 1) { export class QmcMask {
matrix128 = matrix128.concat( private readonly Matrix128: number[];
[this.Super58A],
this.Matrix58.slice(7 * rowIdx, 7 * rowIdx + 7), constructor(matrix: number[] | Uint8Array) {
[this.Super58B], if (matrix instanceof Uint8Array) matrix = Array.from(matrix)
this.Matrix58.slice(56 - 7 - 7 * rowIdx, 56 - 7 * rowIdx).reverse() if (matrix.length === 44) {
); this.Matrix128 = this._generate128(matrix)
} else if (matrix.length === 128) {
this.Matrix128 = matrix
} else {
throw Error("invalid mask length")
} }
this.Matrix128 = matrix128;
} }
generateMask58from128() { getMatrix128() {
if (this.Matrix128.length !== 128) throw "incorrect mask128 length"; return this.Matrix128
const superA = this.Matrix128[0], superB = this.Matrix128[8];
let matrix58 = [];
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"
}
}
this.Matrix58 = matrix58;
this.Super58A = superA;
this.Super58B = superB;
} }
generateMask44from128() { getMatrix44(): number[] {
if (this.Matrix128.length !== 128) throw "incorrect mask128 matrix length"; const matrix44: number[] = []
let mapping = GetConvertMapping()
this.Matrix44 = []
let idxI44 = 0 let idxI44 = 0
mapping.forEach(it256 => { AllMapping.forEach(it256 => {
let it256Len = it256.length let it256Len = it256.length
for (let i = 1; i < it256Len; i++) { for (let i = 1; i < it256Len; i++) {
if (this.Matrix128[it256[0]] !== this.Matrix128[it256[i]]) { if (this.Matrix128[it256[0]] !== this.Matrix128[it256[i]]) {
throw "decode mask-128 to mask-44 failed" throw "decode mask-128 to mask-44 failed"
} }
} }
this.Matrix44[idxI44] = this.Matrix128[it256[0]] matrix44[idxI44] = this.Matrix128[it256[0]]
idxI44++ idxI44++
}) })
return matrix44
} }
generateMask128from44() { Decrypt(data: Uint8Array) {
if (this.Matrix44.length !== 44) throw "incorrect mask length" if (!this.Matrix128) throw Error("bad call sequence")
this.Matrix128 = []
let idx44 = 0
GetConvertMapping().forEach(it256 => {
it256.forEach(m => {
this.Matrix128[m] = this.Matrix44[idx44]
})
idx44++
})
}
Decrypt(data) {
let dst = data.slice(0); let dst = data.slice(0);
let index = -1; let index = -1;
let maskIdx = -1; let maskIdx = -1;
@ -140,13 +109,25 @@ class QmcMask {
} }
return dst; 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() { export function QmcMaskGetDefault() {
return new QmcMask(QMCDefaultMaskMatrix) return new QmcMask(QMCDefaultMaskMatrix)
} }
export function QmcMaskDetectMflac(data) { export function QmcMaskDetectMflac(data: Uint8Array) {
let search_len = Math.min(0x8000, data.length), mask; let search_len = Math.min(0x8000, data.length), mask;
for (let block_idx = 0; block_idx < search_len; block_idx += 128) { for (let block_idx = 0; block_idx < search_len; block_idx += 128) {
try { try {
@ -160,9 +141,9 @@ export function QmcMaskDetectMflac(data) {
return mask; return mask;
} }
export function QmcMaskDetectMgg(data) { export function QmcMaskDetectMgg(data: Uint8Array) {
if (data.length < 0x100) return if (data.length < 0x100) return
let matrixConfidence = {}; let matrixConfidence: { [key: number]: { [key: number]: number } } = {};
for (let i = 0; i < 44; i++) matrixConfidence[i] = {}; for (let i = 0; i < 44; i++) matrixConfidence[i] = {};
const page2 = data[0x54] ^ data[0xC] ^ QMOggPublicHeader1[0xC]; const page2 = data[0x54] ^ data[0xC] ^ QMOggPublicHeader1[0xC];
@ -171,7 +152,7 @@ export function QmcMaskDetectMgg(data) {
for (let idx128 = 0; idx128 < spHeader.length; idx128++) { for (let idx128 = 0; idx128 < spHeader.length; idx128++) {
if (spConf[idx128] === 0) continue; if (spConf[idx128] === 0) continue;
let idx44 = GetMask44Index(idx128); let idx44 = Mask128to44[idx128 % 128];
let _m = data[idx128] ^ spHeader[idx128] let _m = data[idx128] ^ spHeader[idx128]
let confidence = spConf[idx128]; let confidence = spConf[idx128];
if (_m in matrixConfidence[idx44]) { if (_m in matrixConfidence[idx44]) {
@ -183,7 +164,7 @@ export function QmcMaskDetectMgg(data) {
let matrix = []; let matrix = [];
try { try {
for (let i = 0; i < 44; i++) for (let i = 0; i < 44; i++)
matrix[i] = getMaskConfidenceResult(matrixConfidence[i]); matrix[i] = calcMaskFromConfidence(matrixConfidence[i]);
} catch (e) { } catch (e) {
return; return;
} }
@ -191,82 +172,34 @@ export function QmcMaskDetectMgg(data) {
if (!BytesHasPrefix(mask.Decrypt(data.slice(0, OGG_HEADER.length)), OGG_HEADER)) { if (!BytesHasPrefix(mask.Decrypt(data.slice(0, OGG_HEADER.length)), OGG_HEADER)) {
return; return;
} }
return mask; return mask;
} }
export function QmcMaskCreate128(mask128) {
return new QmcMask(mask128)
}
export function QmcMaskCreate58(matrix, superA, superB) { function calcMaskFromConfidence(confidence: { [key: number]: number }) {
return new QmcMask(matrix, superA, superB) console.log(confidence)
} const count = Object.keys(confidence).length
if (count === 0) throw "can not match at least one key";
export function QmcMaskCreate44(mask44) { if (count > 1) console.warn("There are 2 potential value for the mask!")
return new QmcMask(mask44) let result = ""
} let conf = 0
/**
* @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;
for (let idx in confidence) { for (let idx in confidence) {
if (confidence[idx] > conf) { if (confidence[idx] > conf) {
result = idx; result = idx;
conf = confidence[idx]; conf = confidence[idx];
} }
} }
return parseInt(result) return Number(result)
} }
/** function QmcGenerateOggHeader(page2: number) {
* @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]
}
function QmcGenerateOggHeader(page2) {
let spec = [page2, 0xFF] let spec = [page2, 0xFF]
for (let i = 2; i < page2; i++) spec.push(0xFF) for (let i = 2; i < page2; i++) spec.push(0xFF)
spec.push(0xFF) spec.push(0xFF)
return QMOggPublicHeader1.concat(spec, QMOggPublicHeader2) return QMOggPublicHeader1.concat(spec, QMOggPublicHeader2)
} }
function QmcGenerateOggConf(page2) { function QmcGenerateOggConf(page2: number) {
let specConf = [6, 0] let specConf = [6, 0]
for (let i = 2; i < page2; i++) specConf.push(4) for (let i = 2; i < page2; i++) specConf.push(4)
specConf.push(0) specConf.push(0)