Emmm Monster
4 years ago
7 changed files with 245 additions and 174 deletions
@ -1,171 +0,0 @@ |
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import { |
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AudioMimeType, |
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BytesHasPrefix, |
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GetArrayBuffer, |
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GetImageFromURL, |
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GetMetaFromFile, |
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SniffAudioExt, WriteMetaToFlac, WriteMetaToMp3 |
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} from "@/decrypt/utils.ts"; |
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import {parseBlob as metaParseBlob} from "music-metadata-browser"; |
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import jimp from 'jimp'; |
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const CryptoJS = require("crypto-js"); |
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const CORE_KEY = CryptoJS.enc.Hex.parse("687a4852416d736f356b496e62617857"); |
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const META_KEY = CryptoJS.enc.Hex.parse("2331346C6A6B5F215C5D2630553C2728"); |
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const MagicHeader = [0x43, 0x54, 0x45, 0x4E, 0x46, 0x44, 0x41, 0x4D]; |
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export async function Decrypt(file, raw_filename, _) { |
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const fileBuffer = await GetArrayBuffer(file); |
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const dataView = new DataView(fileBuffer); |
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if (!BytesHasPrefix(new Uint8Array(fileBuffer, 0, 8), MagicHeader)) |
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return {status: false, message: "此ncm文件已损坏"}; |
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const keyDataObj = getKeyData(dataView, fileBuffer, 10); |
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const keyBox = getKeyBox(keyDataObj.data); |
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const musicMetaObj = getMetaData(dataView, fileBuffer, keyDataObj.offset); |
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const musicMeta = musicMetaObj.data; |
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let audioOffset = musicMetaObj.offset + dataView.getUint32(musicMetaObj.offset + 5, true) + 13; |
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let audioData = new Uint8Array(fileBuffer, audioOffset); |
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let lenAudioData = audioData.length; |
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for (let cur = 0; cur < lenAudioData; ++cur) audioData[cur] ^= keyBox[cur & 0xff]; |
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if (musicMeta.album === undefined) musicMeta.album = ""; |
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const artists = []; |
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if (!!musicMeta.artist) musicMeta.artist.forEach(arr => artists.push(arr[0])); |
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const info = GetMetaFromFile(raw_filename, musicMeta.musicName, artists.join("; ")) |
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if (artists.length === 0) artists.push(info.artist); |
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if (musicMeta.format === undefined) musicMeta.format = SniffAudioExt(audioData); |
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const imageInfo = await GetImageFromURL(musicMeta.albumPic); |
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const mime = AudioMimeType[musicMeta.format] |
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try { |
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let musicBlob = new Blob([audioData], {type: mime}); |
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const originalMeta = await metaParseBlob(musicBlob); |
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let shouldWrite = !originalMeta.common.album && !originalMeta.common.artists && !originalMeta.common.title |
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if (shouldWrite || imageInfo) { |
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while (imageInfo && imageInfo.buffer.byteLength >= 1 << 24) { |
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let img = await jimp.read(Buffer.from(imageInfo.buffer)) |
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await img.resize(Math.round(img.getHeight() / 2), jimp.AUTO) |
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imageInfo.buffer = await img.getBufferAsync("image/jpeg") |
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} |
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const newMeta = {title: info.title, artists, album: musicMeta.album, picture: imageInfo?.buffer} |
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if (musicMeta.format === "mp3") { |
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audioData = WriteMetaToMp3(audioData.buffer, newMeta, originalMeta) |
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} else if (musicMeta.format === "flac") { |
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audioData = WriteMetaToFlac(Buffer.from(audioData), newMeta, originalMeta) |
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} |
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} |
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} catch (e) { |
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console.warn("Error while appending cover image to file ", e) |
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} |
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const musicData = new Blob([audioData], {type: mime}) |
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return { |
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status: true, |
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title: info.title, |
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artist: info.artist, |
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ext: musicMeta.format, |
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album: musicMeta.album, |
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picture: imageInfo.url, |
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file: URL.createObjectURL(musicData), |
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mime: mime |
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} |
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} |
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function getKeyData(dataView, fileBuffer, offset) { |
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const keyLen = dataView.getUint32(offset, true); |
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offset += 4; |
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const cipherText = new Uint8Array(fileBuffer, offset, keyLen).map( |
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uint8 => uint8 ^ 0x64 |
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); |
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offset += keyLen; |
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const plainText = CryptoJS.AES.decrypt( |
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{ciphertext: CryptoJS.lib.WordArray.create(cipherText)}, |
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CORE_KEY, |
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{ |
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mode: CryptoJS.mode.ECB, |
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padding: CryptoJS.pad.Pkcs7 |
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} |
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); |
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const result = new Uint8Array(plainText.sigBytes); |
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const words = plainText.words; |
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const sigBytes = plainText.sigBytes; |
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for (let i = 0; i < sigBytes; i++) { |
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result[i] = (words[i >>> 2] >>> (24 - (i % 4) * 8)) & 0xff; |
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} |
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return {offset: offset, data: result.slice(17)}; |
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} |
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function getKeyBox(keyData) { |
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const box = new Uint8Array(Array(256).keys()); |
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const keyDataLen = keyData.length; |
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let j = 0; |
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for (let i = 0; i < 256; i++) { |
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j = (box[i] + j + keyData[i % keyDataLen]) & 0xff; |
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[box[i], box[j]] = [box[j], box[i]]; |
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} |
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return box.map((_, i, arr) => { |
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i = (i + 1) & 0xff; |
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const si = arr[i]; |
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const sj = arr[(i + si) & 0xff]; |
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return arr[(si + sj) & 0xff]; |
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}); |
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} |
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/** |
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* @typedef {Object} MusicMetaType |
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* @property {Number} musicId |
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* @property {String} musicName |
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* @property {[[String, Number]]} artist |
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* @property {String} album |
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* @property {"flac"|"mp3"} format |
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* @property {String} albumPic |
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*/ |
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function getMetaData(dataView, fileBuffer, offset) { |
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const metaDataLen = dataView.getUint32(offset, true); |
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offset += 4; |
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if (metaDataLen === 0) return {data: {}, offset: offset}; |
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const cipherText = new Uint8Array(fileBuffer, offset, metaDataLen).map( |
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data => data ^ 0x63 |
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); |
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offset += metaDataLen; |
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const plainText = CryptoJS.AES.decrypt({ |
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ciphertext: CryptoJS.enc.Base64.parse( |
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CryptoJS.lib.WordArray.create(cipherText.slice(22)).toString(CryptoJS.enc.Utf8) |
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) |
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}, |
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META_KEY, |
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{mode: CryptoJS.mode.ECB, padding: CryptoJS.pad.Pkcs7} |
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).toString(CryptoJS.enc.Utf8); |
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const labelIndex = plainText.indexOf(":"); |
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let result = JSON.parse(plainText.slice(labelIndex + 1)); |
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if (plainText.slice(0, labelIndex) === "dj") { |
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result = result.mainMusic; |
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} |
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if (!!result.albumPic && result.albumPic !== "") |
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result.albumPic = result.albumPic.replace("http://", "https://") + "?param=500y500"; |
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return {data: result, offset: offset}; |
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} |
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@ -0,0 +1,235 @@ |
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import { |
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AudioMimeType, |
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BytesHasPrefix, |
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GetArrayBuffer, |
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GetImageFromURL, |
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GetMetaFromFile, IMusicMeta, |
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SniffAudioExt, |
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WriteMetaToFlac, |
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WriteMetaToMp3 |
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} from "@/decrypt/utils.ts"; |
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import {parseBlob as metaParseBlob} from "music-metadata-browser"; |
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import jimp from 'jimp'; |
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import CryptoJS from "crypto-js"; |
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import {DecryptResult} from "@/decrypt/entity"; |
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const CORE_KEY = CryptoJS.enc.Hex.parse("687a4852416d736f356b496e62617857"); |
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const META_KEY = CryptoJS.enc.Hex.parse("2331346C6A6B5F215C5D2630553C2728"); |
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const MagicHeader = [0x43, 0x54, 0x45, 0x4E, 0x46, 0x44, 0x41, 0x4D]; |
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export async function Decrypt(file: File, raw_filename: string, _: string): Promise<DecryptResult> { |
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return (new NcmDecrypt(await GetArrayBuffer(file), raw_filename)).decrypt() |
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} |
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interface NcmMusicMeta { |
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//musicId: number
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musicName?: string |
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artist?: Array<string | number>[] |
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format?: string |
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album?: string |
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albumPic?: string |
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} |
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interface NcmDjMeta { |
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mainMusic: NcmMusicMeta |
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} |
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class NcmDecrypt { |
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raw: ArrayBuffer |
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view: DataView |
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offset: number = 0 |
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filename: string |
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format: string = "" |
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mime: string = "" |
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audio?: Uint8Array |
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blob?: Blob |
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oriMeta?: NcmMusicMeta |
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newMeta?: IMusicMeta |
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image?: { mime: string, buffer: ArrayBuffer, url: string } |
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constructor(buf: ArrayBuffer, filename: string) { |
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const prefix = new Uint8Array(buf, 0, 8) |
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if (!BytesHasPrefix(prefix, MagicHeader)) throw Error("此ncm文件已损坏") |
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this.offset = 10 |
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this.raw = buf |
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this.view = new DataView(buf) |
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this.filename = filename |
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} |
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_getKeyData(): Uint8Array { |
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const keyLen = this.view.getUint32(this.offset, true); |
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this.offset += 4; |
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const cipherText = new Uint8Array(this.raw, this.offset, keyLen) |
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.map(uint8 => uint8 ^ 0x64); |
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this.offset += keyLen; |
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const plainText = CryptoJS.AES.decrypt( |
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// @ts-ignore
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{ciphertext: CryptoJS.lib.WordArray.create(cipherText)}, |
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CORE_KEY, |
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{mode: CryptoJS.mode.ECB, padding: CryptoJS.pad.Pkcs7} |
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); |
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const result = new Uint8Array(plainText.sigBytes); |
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const words = plainText.words; |
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const sigBytes = plainText.sigBytes; |
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for (let i = 0; i < sigBytes; i++) { |
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result[i] = (words[i >>> 2] >>> (24 - (i % 4) * 8)) & 0xff; |
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} |
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return result.slice(17) |
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} |
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_getKeyBox(): Uint8Array { |
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const keyData = this._getKeyData() |
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const box = new Uint8Array(Array(256).keys()); |
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const keyDataLen = keyData.length; |
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let j = 0; |
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for (let i = 0; i < 256; i++) { |
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j = (box[i] + j + keyData[i % keyDataLen]) & 0xff; |
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[box[i], box[j]] = [box[j], box[i]]; |
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} |
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return box.map((_, i, arr) => { |
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i = (i + 1) & 0xff; |
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const si = arr[i]; |
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const sj = arr[(i + si) & 0xff]; |
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return arr[(si + sj) & 0xff]; |
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}); |
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} |
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_getMetaData(): NcmMusicMeta { |
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const metaDataLen = this.view.getUint32(this.offset, true); |
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this.offset += 4; |
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if (metaDataLen === 0) return {}; |
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const cipherText = new Uint8Array(this.raw, this.offset, metaDataLen) |
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.map(data => data ^ 0x63); |
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this.offset += metaDataLen; |
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const plainText = CryptoJS.AES.decrypt( |
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//@ts-ignore
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{ |
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ciphertext: CryptoJS.enc.Base64.parse( |
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//@ts-ignore
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CryptoJS.lib.WordArray.create(cipherText.slice(22)).toString(CryptoJS.enc.Utf8) |
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) |
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}, |
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META_KEY, |
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{mode: CryptoJS.mode.ECB, padding: CryptoJS.pad.Pkcs7} |
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).toString(CryptoJS.enc.Utf8); |
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const labelIndex = plainText.indexOf(":"); |
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let result: NcmMusicMeta; |
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if (plainText.slice(0, labelIndex) === "dj") { |
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const tmp: NcmDjMeta = JSON.parse(plainText.slice(labelIndex + 1)); |
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result = tmp.mainMusic; |
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} else { |
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result = JSON.parse(plainText.slice(labelIndex + 1)); |
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} |
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if (!!result.albumPic) { |
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result.albumPic = result.albumPic.replace("http://", "https://") + "?param=500y500" |
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} |
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return result |
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} |
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_getAudio(keyBox: Uint8Array): Uint8Array { |
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this.offset += this.view.getUint32(this.offset + 5, true) + 13 |
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const audioData = new Uint8Array(this.raw, this.offset) |
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let lenAudioData = audioData.length |
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for (let cur = 0; cur < lenAudioData; ++cur) audioData[cur] ^= keyBox[cur & 0xff] |
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return audioData |
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} |
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async _buildMeta() { |
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if (!this.oriMeta) throw Error("invalid sequence") |
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const info = GetMetaFromFile(this.filename, this.oriMeta.musicName) |
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// build artists
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let artists: string[] = []; |
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if (!!this.oriMeta.artist) { |
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this.oriMeta.artist.forEach(arr => artists.push(<string>arr[0])); |
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} |
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if (artists.length === 0 && !!info.artist) { |
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artists = info.artist.split(',') |
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.map(val => val.trim()).filter(val => val != ""); |
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} |
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if (this.oriMeta.albumPic) try { |
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this.image = await GetImageFromURL(this.oriMeta.albumPic) |
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while (this.image && this.image.buffer.byteLength >= 1 << 24) { |
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let img = await jimp.read(Buffer.from(this.image.buffer)) |
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await img.resize(Math.round(img.getHeight() / 2), jimp.AUTO) |
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this.image.buffer = await img.getBufferAsync("image/jpeg") |
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} |
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} catch (e) { |
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console.log("get cover image failed", e) |
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} |
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this.newMeta = {title: info.title, artists, album: this.oriMeta.album, picture: this.image?.buffer} |
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} |
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async _writeMeta() { |
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if (!this.audio || !this.newMeta) throw Error("invalid sequence") |
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if (!this.blob) this.blob = new Blob([this.audio], {type: this.mime}) |
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const ori = await metaParseBlob(this.blob); |
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let shouldWrite = !ori.common.album && !ori.common.artists && !ori.common.title |
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if (shouldWrite || this.newMeta.picture) { |
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if (this.format === "mp3") { |
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this.audio = WriteMetaToMp3(Buffer.from(this.audio), this.newMeta, ori) |
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} else if (this.format === "flac") { |
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this.audio = WriteMetaToFlac(Buffer.from(this.audio), this.newMeta, ori) |
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} else { |
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console.info(`writing meta for ${this.format} is not being supported for now`) |
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return |
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} |
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this.blob = new Blob([this.audio], {type: this.mime}) |
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} |
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} |
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gatherResult(): DecryptResult { |
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if (!this.newMeta) throw Error("bad sequence") |
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return { |
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status: true, |
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title: this.newMeta.title, |
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artist: this.newMeta.artists?.join("; "), |
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ext: this.format, |
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album: this.newMeta.album, |
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picture: this.image?.url, |
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file: URL.createObjectURL(this.blob), |
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mime: this.mime |
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} |
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} |
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async decrypt() { |
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const keyBox = this._getKeyBox() |
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this.oriMeta = this._getMetaData() |
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this.audio = this._getAudio(keyBox) |
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this.format = this.oriMeta.format || SniffAudioExt(this.audio) |
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this.mime = AudioMimeType[this.format] |
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await this._buildMeta() |
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try { |
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await this._writeMeta() |
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} catch (e) { |
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console.warn("write meta data failed", e) |
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} |
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return this.gatherResult() |
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} |
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} |
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