um/web
um/web
95
188
Fork 0
Code Issues 9 Pull Requests Packages Releases 5 Wiki Activity

refactor: remove suppressed qmc mask methods / constants

Browse Source 
(cherry picked from commit 5d48b28a949cbd42f24781a69124d7aa521e51c1)
This commit is contained in:
鲁树人 2021-12-15 20:11:18 +00:00 committed by MengYX
parent ec6be66cc1
commit 9edcaadb83
No known key found for this signature in database
GPG Key ID: E63F9C7303E8F604
1 changed files with 0 additions and 108 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

108
src/decrypt/qmcMask.ts
View File

@ -1,31 +1,3 @@
import {BytesHasPrefix, FLAC_HEADER, OGG_HEADER} from "@/decrypt/utils";
const QMOggPublicHeader1 = [
0x4f, 0x67, 0x67, 0x53, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff,
0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x01, 0x1e, 0x01, 0x76, 0x6f, 0x72,
0x62, 0x69, 0x73, 0x00, 0x00, 0x00, 0x00, 0x02, 0x44, 0xac, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0xee, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0xb8, 0x01, 0x4f, 0x67, 0x67, 0x53, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x01, 0x00, 0x00, 0x00,
0xff, 0xff, 0xff, 0xff];
const QMOggPublicHeader2 = [
0x03, 0x76, 0x6f, 0x72, 0x62, 0x69, 0x73, 0x2c, 0x00, 0x00, 0x00, 0x58, 0x69, 0x70, 0x68, 0x2e,
0x4f, 0x72, 0x67, 0x20, 0x6c, 0x69, 0x62, 0x56, 0x6f, 0x72, 0x62, 0x69, 0x73, 0x20, 0x49, 0x20,
0x32, 0x30, 0x31, 0x35, 0x30, 0x31, 0x30, 0x35, 0x20, 0x28, 0xe2, 0x9b, 0x84, 0xe2, 0x9b, 0x84,
0xe2, 0x9b, 0x84, 0xe2, 0x9b, 0x84, 0x29, 0xff, 0x00, 0x00, 0x00, 0xff, 0x00, 0x00, 0x00, 0x54,
0x49, 0x54, 0x4c, 0x45, 0x3d];
const QMOggPublicConf1 = [
9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 0, 0,
0, 0, 9, 9, 9, 9, 0, 0, 0, 0, 9, 9, 9, 9, 9, 9,
9, 9, 9, 9, 9, 9, 9, 6, 3, 3, 3, 3, 6, 6, 6, 6,
3, 3, 3, 3, 6, 6, 6, 6, 6, 9, 9, 9, 9, 9, 9, 9,
9, 9, 9, 9, 9, 9, 9, 9, 0, 0, 0, 0, 9, 9, 9, 9,
0, 0, 0, 0];
const QMOggPublicConf2 = [
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 0, 1, 3, 3, 0, 1, 3, 3, 3,
3, 3, 3, 3, 3];
const QMCDefaultMaskMatrix = [
0xde, 0x51, 0xfa, 0xc3, 0x4a, 0xd6, 0xca, 0x90,
0x7e, 0x67, 0x5e, 0xf7, 0xd5, 0x52, 0x84, 0xd8,
@ -34,7 +6,6 @@ const QMCDefaultMaskMatrix = [
0x1d, 0x3f, 0x5b, 0xf0, 0x13, 0x0e, 0x09, 0x3d,
0xf9, 0xbc, 0x00, 0x11];
const AllMapping: number[][] = [];
const Mask128to44: number[] = [];
@ -57,7 +28,6 @@ const Mask128to44: number[] = [];
})
})();
export class QmcMask {
private readonly Matrix128: number[];
@ -126,81 +96,3 @@ export class QmcMask {
export function QmcMaskGetDefault() {
return new QmcMask(QMCDefaultMaskMatrix)
}
export function QmcMaskDetectMflac(data: Uint8Array) {
let search_len = Math.min(0x8000, data.length)
for (let block_idx = 0; block_idx < search_len; block_idx += 128) {
try {
let mask = new QmcMask(data.slice(block_idx, block_idx + 128));
if (BytesHasPrefix(mask.Decrypt(data.slice(0, FLAC_HEADER.length)), FLAC_HEADER)) {
return mask
}
} catch (e) {
}
}
return
}
export function QmcMaskDetectMgg(data: Uint8Array) {
if (data.length < 0x100) return
let matrixConfidence: { [key: number]: { [key: number]: number } } = {};
for (let i = 0; i < 44; i++) matrixConfidence[i] = {};
const page2 = data[0x54] ^ data[0xC] ^ QMOggPublicHeader1[0xC];
const spHeader = QmcGenerateOggHeader(page2)
const spConf = QmcGenerateOggConf(page2)
for (let idx128 = 0; idx128 < spHeader.length; idx128++) {
if (spConf[idx128] === 0) continue;
let idx44 = Mask128to44[idx128 % 128];
let _m = data[idx128] ^ spHeader[idx128]
let confidence = spConf[idx128];
if (_m in matrixConfidence[idx44]) {
matrixConfidence[idx44][_m] += confidence
} else {
matrixConfidence[idx44][_m] = confidence
}
}
let matrix = [];
try {
for (let i = 0; i < 44; i++)
matrix[i] = calcMaskFromConfidence(matrixConfidence[i]);
} catch (e) {
return
}
const mask = new QmcMask(matrix);
if (BytesHasPrefix(mask.Decrypt(data.slice(0, OGG_HEADER.length)), OGG_HEADER)) {
return mask
}
return
}
function calcMaskFromConfidence(confidence: { [key: number]: number }) {
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 Number(result)
}
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: number) {
let specConf = [6, 0]
for (let i = 2; i < page2; i++) specConf.push(4)
specConf.push(0)
return QMOggPublicConf1.concat(specConf, QMOggPublicConf2)
}