refactor(decrypt/qmc): typescript qmc mask
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Emmm Monster
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15dba7b92f
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aca1c11332
@ -1,4 +1,4 @@
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import {QmcMaskCreate58, QmcMaskDetectMflac, QmcMaskDetectMgg, QmcMaskGetDefault} from "./qmcMask";
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import {QmcMask, QmcMaskDetectMflac, QmcMaskDetectMgg, QmcMaskGetDefault} from "./qmcMask";
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import {fromByteArray as Base64Encode, toByteArray as Base64Decode} from 'base64-js'
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import {
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AudioMimeType,
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@ -68,7 +68,7 @@ export async function Decrypt(file, raw_filename, raw_ext) {
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}
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const info = GetMetaFromFile(raw_filename, musicMeta.common.title, musicMeta.common.artist)
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if (handler.detect) reportKeyUsage(keyData, seed.Matrix128,
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if (handler.detect) reportKeyUsage(keyData, seed.getMatrix128(),
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info.artist, info.title, musicMeta.common.album, raw_filename, raw_ext);
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let imgUrl = GetCoverFromFile(musicMeta);
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@ -126,7 +126,7 @@ async function queryKeyInfo(keyData, filename, format) {
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body: JSON.stringify({Format: format, Key: Base64Encode(keyData), Filename: filename, Type: 44}),
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});
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let data = await resp.json();
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return QmcMaskCreate58(Base64Decode(data.Matrix44));
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return new QmcMask(Base64Decode(data.Matrix44));
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} catch (e) {
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console.log(e);
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}
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@ -1,4 +1,4 @@
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import {BytesEquals, BytesHasPrefix, FLAC_HEADER, OGG_HEADER} from "@/decrypt/utils.ts";
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import {BytesHasPrefix, FLAC_HEADER, OGG_HEADER} from "@/decrypt/utils.ts";
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const QMOggPublicHeader1 = [
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0x4f, 0x67, 0x67, 0x53, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff,
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@ -35,96 +35,65 @@ const QMCDefaultMaskMatrix = [
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0xf9, 0xbc, 0x00, 0x11];
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class QmcMask {
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constructor(matrix, superA, superB) {
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if (superA === undefined || superB === undefined) {
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if (matrix.length === 44) {
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this.Matrix44 = matrix
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this.generateMask128from44()
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} else {
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this.Matrix128 = matrix
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this.generateMask44from128()
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}
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this.generateMask58from128()
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const AllMapping: number[][] = [];
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const Mask128to44: number[] = [];
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(function () {
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for (let i = 0; i < 128; i++) {
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let realIdx = (i * i + 27) % 256
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if (realIdx in AllMapping) {
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AllMapping[realIdx].push(i)
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} else {
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this.Matrix58 = matrix;
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this.Super58A = superA;
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this.Super58B = superB;
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this.generateMask128from58();
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this.generateMask44from128()
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AllMapping[realIdx] = [i]
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}
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}
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generateMask128from58() {
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if (this.Matrix58.length !== 56) throw "incorrect mask58 matrix length";
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let idx44 = 0
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AllMapping.forEach(all128 => {
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all128.forEach(_i128 => {
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Mask128to44[_i128] = idx44
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})
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idx44++
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})
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})();
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let matrix128 = [];
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for (let rowIdx = 0; rowIdx < 8; rowIdx += 1) {
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matrix128 = matrix128.concat(
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[this.Super58A],
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this.Matrix58.slice(7 * rowIdx, 7 * rowIdx + 7),
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[this.Super58B],
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this.Matrix58.slice(56 - 7 - 7 * rowIdx, 56 - 7 * rowIdx).reverse()
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);
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export class QmcMask {
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private readonly Matrix128: number[];
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constructor(matrix: number[] | Uint8Array) {
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if (matrix instanceof Uint8Array) matrix = Array.from(matrix)
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if (matrix.length === 44) {
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this.Matrix128 = this._generate128(matrix)
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} else if (matrix.length === 128) {
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this.Matrix128 = matrix
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} else {
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throw Error("invalid mask length")
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}
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this.Matrix128 = matrix128;
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}
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generateMask58from128() {
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if (this.Matrix128.length !== 128) throw "incorrect mask128 length";
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const superA = this.Matrix128[0], superB = this.Matrix128[8];
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let matrix58 = [];
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for (let rowIdx = 0; rowIdx < 8; rowIdx += 1) {
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let lenStart = 16 * rowIdx;
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let lenRightStart = 120 - lenStart;
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if (this.Matrix128[lenStart] !== superA || this.Matrix128[lenStart + 8] !== superB) {
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throw "decode mask-128 to mask-58 failed"
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}
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let rowLeft = this.Matrix128.slice(lenStart + 1, lenStart + 8);
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let rowRight = this.Matrix128.slice(lenRightStart + 1, lenRightStart + 8).reverse();
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if (BytesEquals(rowLeft, rowRight)) {
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matrix58 = matrix58.concat(rowLeft);
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} else {
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throw "decode mask-128 to mask-58 failed"
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}
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}
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this.Matrix58 = matrix58;
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this.Super58A = superA;
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this.Super58B = superB;
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getMatrix128() {
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return this.Matrix128
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}
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generateMask44from128() {
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if (this.Matrix128.length !== 128) throw "incorrect mask128 matrix length";
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let mapping = GetConvertMapping()
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this.Matrix44 = []
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getMatrix44(): number[] {
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const matrix44: number[] = []
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let idxI44 = 0
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mapping.forEach(it256 => {
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AllMapping.forEach(it256 => {
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let it256Len = it256.length
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for (let i = 1; i < it256Len; i++) {
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if (this.Matrix128[it256[0]] !== this.Matrix128[it256[i]]) {
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throw "decode mask-128 to mask-44 failed"
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}
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}
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this.Matrix44[idxI44] = this.Matrix128[it256[0]]
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matrix44[idxI44] = this.Matrix128[it256[0]]
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idxI44++
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})
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return matrix44
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}
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generateMask128from44() {
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if (this.Matrix44.length !== 44) throw "incorrect mask length"
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this.Matrix128 = []
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let idx44 = 0
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GetConvertMapping().forEach(it256 => {
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it256.forEach(m => {
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this.Matrix128[m] = this.Matrix44[idx44]
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})
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idx44++
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})
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}
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Decrypt(data) {
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Decrypt(data: Uint8Array) {
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if (!this.Matrix128) throw Error("bad call sequence")
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let dst = data.slice(0);
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let index = -1;
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let maskIdx = -1;
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@ -140,13 +109,25 @@ class QmcMask {
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}
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return dst;
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}
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private _generate128(matrix44: number[]): number[] {
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const matrix128: number[] = []
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let idx44 = 0
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AllMapping.forEach(it256 => {
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it256.forEach(m => {
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matrix128[m] = matrix44[idx44]
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})
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idx44++
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})
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return matrix128
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}
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}
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export function QmcMaskGetDefault() {
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return new QmcMask(QMCDefaultMaskMatrix)
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}
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export function QmcMaskDetectMflac(data) {
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export function QmcMaskDetectMflac(data: Uint8Array) {
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let search_len = Math.min(0x8000, data.length), mask;
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for (let block_idx = 0; block_idx < search_len; block_idx += 128) {
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try {
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@ -160,9 +141,9 @@ export function QmcMaskDetectMflac(data) {
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return mask;
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}
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export function QmcMaskDetectMgg(data) {
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export function QmcMaskDetectMgg(data: Uint8Array) {
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if (data.length < 0x100) return
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let matrixConfidence = {};
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let matrixConfidence: { [key: number]: { [key: number]: number } } = {};
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for (let i = 0; i < 44; i++) matrixConfidence[i] = {};
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const page2 = data[0x54] ^ data[0xC] ^ QMOggPublicHeader1[0xC];
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@ -171,7 +152,7 @@ export function QmcMaskDetectMgg(data) {
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for (let idx128 = 0; idx128 < spHeader.length; idx128++) {
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if (spConf[idx128] === 0) continue;
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let idx44 = GetMask44Index(idx128);
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let idx44 = Mask128to44[idx128 % 128];
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let _m = data[idx128] ^ spHeader[idx128]
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let confidence = spConf[idx128];
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if (_m in matrixConfidence[idx44]) {
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@ -183,7 +164,7 @@ export function QmcMaskDetectMgg(data) {
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let matrix = [];
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try {
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for (let i = 0; i < 44; i++)
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matrix[i] = getMaskConfidenceResult(matrixConfidence[i]);
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matrix[i] = calcMaskFromConfidence(matrixConfidence[i]);
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} catch (e) {
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return;
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}
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@ -191,82 +172,34 @@ export function QmcMaskDetectMgg(data) {
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if (!BytesHasPrefix(mask.Decrypt(data.slice(0, OGG_HEADER.length)), OGG_HEADER)) {
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return;
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}
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return mask;
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}
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export function QmcMaskCreate128(mask128) {
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return new QmcMask(mask128)
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}
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export function QmcMaskCreate58(matrix, superA, superB) {
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return new QmcMask(matrix, superA, superB)
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}
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export function QmcMaskCreate44(mask44) {
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return new QmcMask(mask44)
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}
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/**
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* @param confidence {{}}
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* @returns {number}
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*/
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function getMaskConfidenceResult(confidence) {
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if (confidence.length === 0) throw "can not match at least one key";
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if (confidence.length > 1) console.warn("There are 2 potential value for the mask!")
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let result, conf = 0;
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function calcMaskFromConfidence(confidence: { [key: number]: number }) {
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console.log(confidence)
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const count = Object.keys(confidence).length
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if (count === 0) throw "can not match at least one key";
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if (count > 1) console.warn("There are 2 potential value for the mask!")
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let result = ""
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let conf = 0
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for (let idx in confidence) {
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if (confidence[idx] > conf) {
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result = idx;
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conf = confidence[idx];
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}
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}
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return parseInt(result)
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return Number(result)
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}
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/**
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* @return {number}
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*/
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const allMapping = [];
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const mask128to44 = [];
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(function () {
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for (let i = 0; i < 128; i++) {
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let realIdx = (i * i + 27) % 256
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if (realIdx in allMapping) {
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allMapping[realIdx].push(i)
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} else {
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allMapping[realIdx] = [i]
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}
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}
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let idx44 = 0
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allMapping.forEach(all128 => {
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all128.forEach(_i128 => {
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mask128to44[_i128] = idx44
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})
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idx44++
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})
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})();
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function GetConvertMapping() {
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return allMapping;
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}
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function GetMask44Index(idx128) {
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return mask128to44[idx128 % 128]
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}
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function QmcGenerateOggHeader(page2) {
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function QmcGenerateOggHeader(page2: number) {
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let spec = [page2, 0xFF]
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for (let i = 2; i < page2; i++) spec.push(0xFF)
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spec.push(0xFF)
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return QMOggPublicHeader1.concat(spec, QMOggPublicHeader2)
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}
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function QmcGenerateOggConf(page2) {
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function QmcGenerateOggConf(page2: number) {
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let specConf = [6, 0]
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for (let i = 2; i < page2; i++) specConf.push(4)
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specConf.push(0)
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