mirror of
https://git.unlock-music.dev/um/web.git
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chore(QMCv2): fix code style
(cherry picked from commit 87138718549bdec014752ba43dcd5997aaf29137)
This commit is contained in:
parent
979168b68f
commit
632651b371
@ -1,4 +1,4 @@
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import {QmcMapCipher, QmcRC4Cipher, QmcStaticCipher, StreamCipher} from "./qmc_cipher";
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import {QmcMapCipher, QmcRC4Cipher, QmcStaticCipher, QmcStreamCipher} from "./qmc_cipher";
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import {
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import {
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AudioMimeType,
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AudioMimeType,
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GetArrayBuffer,
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GetArrayBuffer,
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@ -16,7 +16,7 @@ import {DecryptQMCWasm} from "./qmc_wasm";
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import iconv from "iconv-lite";
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import iconv from "iconv-lite";
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import {DecryptResult} from "@/decrypt/entity";
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import {DecryptResult} from "@/decrypt/entity";
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import {queryAlbumCover} from "@/utils/api";
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import {queryAlbumCover} from "@/utils/api";
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import {QmcDecryptKey} from "@/decrypt/qmc_key";
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import {QmcDeriveKey} from "@/decrypt/qmc_key";
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interface Handler {
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interface Handler {
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ext: string
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ext: string
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@ -141,7 +141,8 @@ export class QmcDecoder {
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size: number
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size: number
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decoded: boolean = false
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decoded: boolean = false
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audioSize?: number
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audioSize?: number
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cipher?: StreamCipher
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private static readonly BYTE_COMMA = ','.charCodeAt(0)
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cipher?: QmcStreamCipher
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constructor(file: Uint8Array) {
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constructor(file: Uint8Array) {
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this.file = file
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this.file = file
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@ -167,16 +168,16 @@ export class QmcDecoder {
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}
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}
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private searchKey() {
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private searchKey() {
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const last4Byte = this.file.slice(this.size - 4);
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const last4Byte = this.file.slice(-4);
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const textEnc = new TextDecoder()
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const textEnc = new TextDecoder()
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if (textEnc.decode(last4Byte) === 'QTag') {
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if (textEnc.decode(last4Byte) === 'QTag') {
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const sizeBuf = this.file.slice(this.size - 8, this.size - 4)
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const sizeBuf = this.file.slice(-8, -4)
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const sizeView = new DataView(sizeBuf.buffer, sizeBuf.byteOffset)
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const sizeView = new DataView(sizeBuf.buffer, sizeBuf.byteOffset)
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const keySize = sizeView.getUint32(0, false)
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const keySize = sizeView.getUint32(0, false)
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this.audioSize = this.size - keySize - 8
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this.audioSize = this.size - keySize - 8
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const rawKey = this.file.subarray(this.audioSize, this.size - 8)
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const rawKey = this.file.subarray(this.audioSize, this.size - 8)
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const keyEnd = rawKey.findIndex(v => v == ','.charCodeAt(0))
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const keyEnd = rawKey.findIndex(v => v == QmcDecoder.BYTE_COMMA)
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const keyDec = QmcDecryptKey(rawKey.subarray(0, keyEnd))
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const keyDec = QmcDeriveKey(rawKey.subarray(0, keyEnd))
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this.cipher = new QmcRC4Cipher(keyDec)
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this.cipher = new QmcRC4Cipher(keyDec)
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} else {
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} else {
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const sizeView = new DataView(last4Byte.buffer, last4Byte.byteOffset);
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const sizeView = new DataView(last4Byte.buffer, last4Byte.byteOffset);
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@ -184,7 +185,7 @@ export class QmcDecoder {
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if (keySize < 0x300) {
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if (keySize < 0x300) {
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this.audioSize = this.size - keySize - 4
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this.audioSize = this.size - keySize - 4
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const rawKey = this.file.subarray(this.audioSize, this.size - 4)
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const rawKey = this.file.subarray(this.audioSize, this.size - 4)
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const keyDec = QmcDecryptKey(rawKey)
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const keyDec = QmcDeriveKey(rawKey)
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this.cipher = new QmcMapCipher(keyDec)
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this.cipher = new QmcMapCipher(keyDec)
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} else {
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} else {
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this.audioSize = this.size
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this.audioSize = this.size
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@ -1,47 +1,47 @@
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const staticCipherBox = new Uint8Array([
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export interface QmcStreamCipher {
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0x77, 0x48, 0x32, 0x73, 0xDE, 0xF2, 0xC0, 0xC8, //0x00
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0x95, 0xEC, 0x30, 0xB2, 0x51, 0xC3, 0xE1, 0xA0, //0x08
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0x9E, 0xE6, 0x9D, 0xCF, 0xFA, 0x7F, 0x14, 0xD1, //0x10
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0xCE, 0xB8, 0xDC, 0xC3, 0x4A, 0x67, 0x93, 0xD6, //0x18
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0x28, 0xC2, 0x91, 0x70, 0xCA, 0x8D, 0xA2, 0xA4, //0x20
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0xF0, 0x08, 0x61, 0x90, 0x7E, 0x6F, 0xA2, 0xE0, //0x28
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0xEB, 0xAE, 0x3E, 0xB6, 0x67, 0xC7, 0x92, 0xF4, //0x30
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0x91, 0xB5, 0xF6, 0x6C, 0x5E, 0x84, 0x40, 0xF7, //0x38
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0xF3, 0x1B, 0x02, 0x7F, 0xD5, 0xAB, 0x41, 0x89, //0x40
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0x28, 0xF4, 0x25, 0xCC, 0x52, 0x11, 0xAD, 0x43, //0x48
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0x68, 0xA6, 0x41, 0x8B, 0x84, 0xB5, 0xFF, 0x2C, //0x50
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0x92, 0x4A, 0x26, 0xD8, 0x47, 0x6A, 0x7C, 0x95, //0x58
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0x61, 0xCC, 0xE6, 0xCB, 0xBB, 0x3F, 0x47, 0x58, //0x60
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0x89, 0x75, 0xC3, 0x75, 0xA1, 0xD9, 0xAF, 0xCC, //0x68
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0x08, 0x73, 0x17, 0xDC, 0xAA, 0x9A, 0xA2, 0x16, //0x70
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0x41, 0xD8, 0xA2, 0x06, 0xC6, 0x8B, 0xFC, 0x66, //0x78
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0x34, 0x9F, 0xCF, 0x18, 0x23, 0xA0, 0x0A, 0x74, //0x80
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0xE7, 0x2B, 0x27, 0x70, 0x92, 0xE9, 0xAF, 0x37, //0x88
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0xE6, 0x8C, 0xA7, 0xBC, 0x62, 0x65, 0x9C, 0xC2, //0x90
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0x08, 0xC9, 0x88, 0xB3, 0xF3, 0x43, 0xAC, 0x74, //0x98
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0x2C, 0x0F, 0xD4, 0xAF, 0xA1, 0xC3, 0x01, 0x64, //0xA0
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0x95, 0x4E, 0x48, 0x9F, 0xF4, 0x35, 0x78, 0x95, //0xA8
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0x7A, 0x39, 0xD6, 0x6A, 0xA0, 0x6D, 0x40, 0xE8, //0xB0
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0x4F, 0xA8, 0xEF, 0x11, 0x1D, 0xF3, 0x1B, 0x3F, //0xB8
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0x3F, 0x07, 0xDD, 0x6F, 0x5B, 0x19, 0x30, 0x19, //0xC0
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0xFB, 0xEF, 0x0E, 0x37, 0xF0, 0x0E, 0xCD, 0x16, //0xC8
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0x49, 0xFE, 0x53, 0x47, 0x13, 0x1A, 0xBD, 0xA4, //0xD0
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0xF1, 0x40, 0x19, 0x60, 0x0E, 0xED, 0x68, 0x09, //0xD8
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0x06, 0x5F, 0x4D, 0xCF, 0x3D, 0x1A, 0xFE, 0x20, //0xE0
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0x77, 0xE4, 0xD9, 0xDA, 0xF9, 0xA4, 0x2B, 0x76, //0xE8
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0x1C, 0x71, 0xDB, 0x00, 0xBC, 0xFD, 0x0C, 0x6C, //0xF0
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0xA5, 0x47, 0xF7, 0xF6, 0x00, 0x79, 0x4A, 0x11, //0xF8
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])
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export interface StreamCipher {
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decrypt(buf: Uint8Array, offset: number): void
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decrypt(buf: Uint8Array, offset: number): void
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}
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}
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export class QmcStaticCipher implements StreamCipher {
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export class QmcStaticCipher implements QmcStreamCipher {
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private static readonly staticCipherBox: Uint8Array = new Uint8Array([
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0x77, 0x48, 0x32, 0x73, 0xDE, 0xF2, 0xC0, 0xC8, //0x00
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0x95, 0xEC, 0x30, 0xB2, 0x51, 0xC3, 0xE1, 0xA0, //0x08
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0x9E, 0xE6, 0x9D, 0xCF, 0xFA, 0x7F, 0x14, 0xD1, //0x10
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0xCE, 0xB8, 0xDC, 0xC3, 0x4A, 0x67, 0x93, 0xD6, //0x18
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0x28, 0xC2, 0x91, 0x70, 0xCA, 0x8D, 0xA2, 0xA4, //0x20
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0xF0, 0x08, 0x61, 0x90, 0x7E, 0x6F, 0xA2, 0xE0, //0x28
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0xEB, 0xAE, 0x3E, 0xB6, 0x67, 0xC7, 0x92, 0xF4, //0x30
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0x91, 0xB5, 0xF6, 0x6C, 0x5E, 0x84, 0x40, 0xF7, //0x38
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0xF3, 0x1B, 0x02, 0x7F, 0xD5, 0xAB, 0x41, 0x89, //0x40
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0x28, 0xF4, 0x25, 0xCC, 0x52, 0x11, 0xAD, 0x43, //0x48
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0x68, 0xA6, 0x41, 0x8B, 0x84, 0xB5, 0xFF, 0x2C, //0x50
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0x92, 0x4A, 0x26, 0xD8, 0x47, 0x6A, 0x7C, 0x95, //0x58
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0x61, 0xCC, 0xE6, 0xCB, 0xBB, 0x3F, 0x47, 0x58, //0x60
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0x89, 0x75, 0xC3, 0x75, 0xA1, 0xD9, 0xAF, 0xCC, //0x68
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0x08, 0x73, 0x17, 0xDC, 0xAA, 0x9A, 0xA2, 0x16, //0x70
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0x41, 0xD8, 0xA2, 0x06, 0xC6, 0x8B, 0xFC, 0x66, //0x78
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0x34, 0x9F, 0xCF, 0x18, 0x23, 0xA0, 0x0A, 0x74, //0x80
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0xE7, 0x2B, 0x27, 0x70, 0x92, 0xE9, 0xAF, 0x37, //0x88
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0xE6, 0x8C, 0xA7, 0xBC, 0x62, 0x65, 0x9C, 0xC2, //0x90
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0x08, 0xC9, 0x88, 0xB3, 0xF3, 0x43, 0xAC, 0x74, //0x98
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0x2C, 0x0F, 0xD4, 0xAF, 0xA1, 0xC3, 0x01, 0x64, //0xA0
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0x95, 0x4E, 0x48, 0x9F, 0xF4, 0x35, 0x78, 0x95, //0xA8
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0x7A, 0x39, 0xD6, 0x6A, 0xA0, 0x6D, 0x40, 0xE8, //0xB0
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0x4F, 0xA8, 0xEF, 0x11, 0x1D, 0xF3, 0x1B, 0x3F, //0xB8
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0x3F, 0x07, 0xDD, 0x6F, 0x5B, 0x19, 0x30, 0x19, //0xC0
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0xFB, 0xEF, 0x0E, 0x37, 0xF0, 0x0E, 0xCD, 0x16, //0xC8
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0x49, 0xFE, 0x53, 0x47, 0x13, 0x1A, 0xBD, 0xA4, //0xD0
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0xF1, 0x40, 0x19, 0x60, 0x0E, 0xED, 0x68, 0x09, //0xD8
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0x06, 0x5F, 0x4D, 0xCF, 0x3D, 0x1A, 0xFE, 0x20, //0xE0
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0x77, 0xE4, 0xD9, 0xDA, 0xF9, 0xA4, 0x2B, 0x76, //0xE8
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0x1C, 0x71, 0xDB, 0x00, 0xBC, 0xFD, 0x0C, 0x6C, //0xF0
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0xA5, 0x47, 0xF7, 0xF6, 0x00, 0x79, 0x4A, 0x11, //0xF8
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])
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public getMask(offset: number) {
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public getMask(offset: number) {
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if (offset > 0x7FFF) offset %= 0x7FFF
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if (offset > 0x7FFF) offset %= 0x7FFF
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return staticCipherBox[(offset * offset + 27) & 0xff]
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return QmcStaticCipher.staticCipherBox[(offset * offset + 27) & 0xff]
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}
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}
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public decrypt(buf: Uint8Array, offset: number) {
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public decrypt(buf: Uint8Array, offset: number) {
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@ -51,7 +51,7 @@ export class QmcStaticCipher implements StreamCipher {
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}
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}
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}
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}
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export class QmcMapCipher implements StreamCipher {
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export class QmcMapCipher implements QmcStreamCipher {
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key: Uint8Array
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key: Uint8Array
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n: number
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n: number
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@ -84,10 +84,10 @@ export class QmcMapCipher implements StreamCipher {
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}
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}
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const FIRST_SEGMENT_SIZE = 0x80;
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export class QmcRC4Cipher implements QmcStreamCipher {
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const SEGMENT_SIZE = 5120
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private static readonly FIRST_SEGMENT_SIZE = 0x80;
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private static readonly SEGMENT_SIZE = 5120
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export class QmcRC4Cipher implements StreamCipher {
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S: Uint8Array
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S: Uint8Array
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N: number
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N: number
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key: Uint8Array
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key: Uint8Array
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@ -139,23 +139,23 @@ export class QmcRC4Cipher implements StreamCipher {
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}
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}
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// Initial segment
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// Initial segment
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if (offset < FIRST_SEGMENT_SIZE) {
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if (offset < QmcRC4Cipher.FIRST_SEGMENT_SIZE) {
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const len_segment = Math.min(buf.length, FIRST_SEGMENT_SIZE - offset);
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const len_segment = Math.min(buf.length, QmcRC4Cipher.FIRST_SEGMENT_SIZE - offset);
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this.encFirstSegment(buf.subarray(0, len_segment), offset);
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this.encFirstSegment(buf.subarray(0, len_segment), offset);
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if (postProcess(len_segment)) return
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if (postProcess(len_segment)) return
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}
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}
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// align segment
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// align segment
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if (offset % SEGMENT_SIZE != 0) {
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if (offset % QmcRC4Cipher.SEGMENT_SIZE != 0) {
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const len_segment = Math.min(SEGMENT_SIZE - (offset % SEGMENT_SIZE), toProcess);
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const len_segment = Math.min(QmcRC4Cipher.SEGMENT_SIZE - (offset % QmcRC4Cipher.SEGMENT_SIZE), toProcess);
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this.encASegment(buf.subarray(processed, processed + len_segment), offset);
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this.encASegment(buf.subarray(processed, processed + len_segment), offset);
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if (postProcess(len_segment)) return
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if (postProcess(len_segment)) return
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}
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}
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// Batch process segments
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// Batch process segments
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while (toProcess > SEGMENT_SIZE) {
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while (toProcess > QmcRC4Cipher.SEGMENT_SIZE) {
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this.encASegment(buf.subarray(processed, processed + SEGMENT_SIZE), offset);
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this.encASegment(buf.subarray(processed, processed + QmcRC4Cipher.SEGMENT_SIZE), offset);
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postProcess(SEGMENT_SIZE)
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postProcess(QmcRC4Cipher.SEGMENT_SIZE)
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}
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}
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// Last segment (incomplete segment)
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// Last segment (incomplete segment)
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@ -168,7 +168,7 @@ export class QmcRC4Cipher implements StreamCipher {
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private encFirstSegment(buf: Uint8Array, offset: number) {
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private encFirstSegment(buf: Uint8Array, offset: number) {
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for (let i = 0; i < buf.length; i++) {
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for (let i = 0; i < buf.length; i++) {
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buf[i] ^= this.key[this.getSegmentSkip(offset + i)];
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buf[i] ^= this.key[this.getSegmentKey(offset + i)];
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}
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}
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}
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}
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@ -178,7 +178,7 @@ export class QmcRC4Cipher implements StreamCipher {
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// Calculate the number of bytes to skip.
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// Calculate the number of bytes to skip.
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// The initial "key" derived from segment id, plus the current offset.
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// The initial "key" derived from segment id, plus the current offset.
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const skipLen = (offset % SEGMENT_SIZE) + this.getSegmentSkip(offset / SEGMENT_SIZE)
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const skipLen = (offset % QmcRC4Cipher.SEGMENT_SIZE) + this.getSegmentKey(offset / QmcRC4Cipher.SEGMENT_SIZE)
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// decrypt the block
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// decrypt the block
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let j = 0;
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let j = 0;
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@ -194,7 +194,7 @@ export class QmcRC4Cipher implements StreamCipher {
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}
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}
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}
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}
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private getSegmentSkip(id: number): number {
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private getSegmentKey(id: number): number {
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const seed = this.key[id % this.N]
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const seed = this.key[id % this.N]
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const idx = (this.hash / ((id + 1) * seed) * 100.0) | 0;
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const idx = (this.hash / ((id + 1) * seed) * 100.0) | 0;
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return idx % this.N
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return idx % this.N
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@ -1,4 +1,4 @@
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import {QmcDecryptKey, simpleMakeKey,} from "@/decrypt/qmc_key";
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import {QmcDeriveKey, simpleMakeKey} from "@/decrypt/qmc_key";
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import fs from "fs";
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import fs from "fs";
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test("key dec: make simple key", () => {
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test("key dec: make simple key", () => {
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@ -23,7 +23,7 @@ test("key dec: real file", async () => {
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const cases = ["mflac_map", "mgg_map", "mflac0_rc4"]
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const cases = ["mflac_map", "mgg_map", "mflac0_rc4"]
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for (const name of cases) {
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for (const name of cases) {
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const {clearText, cipherText} = loadTestDataKeyDecrypt(name)
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const {clearText, cipherText} = loadTestDataKeyDecrypt(name)
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const buf = QmcDecryptKey(cipherText)
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const buf = QmcDeriveKey(cipherText)
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expect(buf).toStrictEqual(clearText)
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expect(buf).toStrictEqual(clearText)
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}
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}
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@ -1,5 +1,29 @@
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import {TeaCipher} from "@/utils/tea";
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import {TeaCipher} from "@/utils/tea";
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const SALT_LEN = 2
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const ZERO_LEN = 7
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export function QmcDeriveKey(raw: Uint8Array): Uint8Array {
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const textDec = new TextDecoder()
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||||||
|
const rawDec = Buffer.from(textDec.decode(raw), 'base64')
|
||||||
|
let n = rawDec.length;
|
||||||
|
if (n < 16) {
|
||||||
|
throw Error("key length is too short")
|
||||||
|
}
|
||||||
|
|
||||||
|
const simpleKey = simpleMakeKey(106, 8)
|
||||||
|
let teaKey = new Uint8Array(16);
|
||||||
|
for (let i = 0; i < 8; i++) {
|
||||||
|
teaKey[i << 1] = simpleKey[i];
|
||||||
|
teaKey[(i << 1) + 1] = rawDec[i];
|
||||||
|
}
|
||||||
|
const sub = decryptTencentTea(rawDec.subarray(8), teaKey)
|
||||||
|
rawDec.set(sub, 8)
|
||||||
|
return rawDec.subarray(0, 8 + sub.length)
|
||||||
|
|
||||||
|
}
|
||||||
|
|
||||||
|
// simpleMakeKey exported only for unit test
|
||||||
export function simpleMakeKey(salt: number, length: number): number[] {
|
export function simpleMakeKey(salt: number, length: number): number[] {
|
||||||
const keyBuf: number[] = []
|
const keyBuf: number[] = []
|
||||||
for (let i = 0; i < length; i++) {
|
for (let i = 0; i < length; i++) {
|
||||||
@ -9,8 +33,6 @@ export function simpleMakeKey(salt: number, length: number): number[] {
|
|||||||
return keyBuf
|
return keyBuf
|
||||||
}
|
}
|
||||||
|
|
||||||
const SALT_LEN = 2
|
|
||||||
const ZERO_LEN = 7
|
|
||||||
|
|
||||||
function decryptTencentTea(inBuf: Uint8Array, key: Uint8Array): Uint8Array {
|
function decryptTencentTea(inBuf: Uint8Array, key: Uint8Array): Uint8Array {
|
||||||
if (inBuf.length % 8 != 0) {
|
if (inBuf.length % 8 != 0) {
|
||||||
@ -83,22 +105,3 @@ function decryptTencentTea(inBuf: Uint8Array, key: Uint8Array): Uint8Array {
|
|||||||
return outBuf
|
return outBuf
|
||||||
}
|
}
|
||||||
|
|
||||||
export function QmcDecryptKey(raw: Uint8Array): Uint8Array {
|
|
||||||
const textDec = new TextDecoder()
|
|
||||||
const rawDec = Buffer.from(textDec.decode(raw), 'base64')
|
|
||||||
let n = rawDec.length;
|
|
||||||
if (n < 16) {
|
|
||||||
throw Error("key length is too short")
|
|
||||||
}
|
|
||||||
|
|
||||||
const simpleKey = simpleMakeKey(106, 8)
|
|
||||||
let teaKey = new Uint8Array(16);
|
|
||||||
for (let i = 0; i < 8; i++) {
|
|
||||||
teaKey[i << 1] = simpleKey[i];
|
|
||||||
teaKey[(i << 1) + 1] = rawDec[i];
|
|
||||||
}
|
|
||||||
const sub = decryptTencentTea(rawDec.subarray(8), teaKey)
|
|
||||||
rawDec.set(sub, 8)
|
|
||||||
return rawDec.subarray(0, 8 + sub.length)
|
|
||||||
|
|
||||||
}
|
|
||||||
|
@ -33,7 +33,7 @@ export function BytesHasPrefix(data: Uint8Array, prefix: number[]): boolean {
|
|||||||
}
|
}
|
||||||
|
|
||||||
export function BytesEqual(a: Uint8Array, b: Uint8Array,): boolean {
|
export function BytesEqual(a: Uint8Array, b: Uint8Array,): boolean {
|
||||||
if (a.length != b.length) return false
|
if (a.length !== b.length) return false
|
||||||
return a.every((val, idx) => {
|
return a.every((val, idx) => {
|
||||||
return val === b[idx];
|
return val === b[idx];
|
||||||
})
|
})
|
||||||
|
Loading…
Reference in New Issue
Block a user