From 9edcaadb83fa86e126c732f6bb66c9e13fc87b45 Mon Sep 17 00:00:00 2001 From: Jixun Wu Date: Wed, 15 Dec 2021 20:11:18 +0000 Subject: [PATCH] refactor: remove suppressed qmc mask methods / constants (cherry picked from commit 5d48b28a949cbd42f24781a69124d7aa521e51c1) --- src/decrypt/qmcMask.ts | 108 ----------------------------------------- 1 file changed, 108 deletions(-) diff --git a/src/decrypt/qmcMask.ts b/src/decrypt/qmcMask.ts index 54af4bf..161ddd0 100644 --- a/src/decrypt/qmcMask.ts +++ b/src/decrypt/qmcMask.ts @@ -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) -}