import { AudioMimeType, BytesHasPrefix, GetArrayBuffer, GetCoverFromFile, GetMetaFromFile, SniffAudioExt } from "@/decrypt/utils"; import {parseBlob as metaParseBlob} from "music-metadata-browser"; import {DecryptResult} from "@/decrypt/entity"; import config from "@/../package.json" const VprHeader = [ 0x05, 0x28, 0xBC, 0x96, 0xE9, 0xE4, 0x5A, 0x43, 0x91, 0xAA, 0xBD, 0xD0, 0x7A, 0xF5, 0x36, 0x31] const KgmHeader = [ 0x7C, 0xD5, 0x32, 0xEB, 0x86, 0x02, 0x7F, 0x4B, 0xA8, 0xAF, 0xA6, 0x8E, 0x0F, 0xFF, 0x99, 0x14] const VprMaskDiff = [ 0x25, 0xDF, 0xE8, 0xA6, 0x75, 0x1E, 0x75, 0x0E, 0x2F, 0x80, 0xF3, 0x2D, 0xB8, 0xB6, 0xE3, 0x11, 0x00] export async function Decrypt(file: File, raw_filename: string, raw_ext: string): Promise { const oriData = new Uint8Array(await GetArrayBuffer(file)); if (raw_ext === "vpr") { if (!BytesHasPrefix(oriData, VprHeader)) throw Error("Not a valid vpr file!") } else { if (!BytesHasPrefix(oriData, KgmHeader)) throw Error("Not a valid kgm(a) file!") } let bHeaderLen = new DataView(oriData.slice(0x10, 0x14).buffer) let headerLen = bHeaderLen.getUint32(0, true) let audioData = oriData.slice(headerLen) let dataLen = audioData.length if (audioData.byteLength > 1 << 26) { throw Error("文件过大,请使用 CLI版本 进行解锁") } let key1 = new Uint8Array(17) key1.set(oriData.slice(0x1c, 0x2c), 0) if (MaskV2.length === 0) { if (!await LoadMaskV2()) throw Error("加载Kgm/Vpr Mask数据失败") } for (let i = 0; i < dataLen; i++) { let med8 = key1[i % 17] ^ audioData[i] med8 ^= (med8 & 0xf) << 4 let msk8 = GetMask(i) msk8 ^= (msk8 & 0xf) << 4 audioData[i] = med8 ^ msk8 } if (raw_ext === "vpr") { for (let i = 0; i < dataLen; i++) audioData[i] ^= VprMaskDiff[i % 17] } const ext = SniffAudioExt(audioData); const mime = AudioMimeType[ext]; let musicBlob = new Blob([audioData], {type: mime}); const musicMeta = await metaParseBlob(musicBlob); const {title, artist} = GetMetaFromFile(raw_filename, musicMeta.common.title, musicMeta.common.artist) return { album: musicMeta.common.album, picture: GetCoverFromFile(musicMeta), file: URL.createObjectURL(musicBlob), blob: musicBlob, ext, mime, title, artist } } function GetMask(pos: number) { return MaskV2PreDef[pos % 272] ^ MaskV2[pos >> 4] } let MaskV2: Uint8Array = new Uint8Array(0); async function LoadMaskV2(): Promise { let mask_url = `https://cdn.jsdelivr.net/gh/unlock-music/unlock-music@${config.version}/public/static/kgm.mask` if (["http:", "https:"].some(v => v == self.location.protocol)) { if (!!self.document) {// using Web Worker mask_url = "./static/kgm.mask" } else {// using Main thread mask_url = "../static/kgm.mask" } } try { const resp = await fetch(mask_url, {method: "GET"}) MaskV2 = new Uint8Array(await resp.arrayBuffer()); return true } catch (e) { console.error(e) return false } } const MaskV2PreDef = [ 0xB8, 0xD5, 0x3D, 0xB2, 0xE9, 0xAF, 0x78, 0x8C, 0x83, 0x33, 0x71, 0x51, 0x76, 0xA0, 0xCD, 0x37, 0x2F, 0x3E, 0x35, 0x8D, 0xA9, 0xBE, 0x98, 0xB7, 0xE7, 0x8C, 0x22, 0xCE, 0x5A, 0x61, 0xDF, 0x68, 0x69, 0x89, 0xFE, 0xA5, 0xB6, 0xDE, 0xA9, 0x77, 0xFC, 0xC8, 0xBD, 0xBD, 0xE5, 0x6D, 0x3E, 0x5A, 0x36, 0xEF, 0x69, 0x4E, 0xBE, 0xE1, 0xE9, 0x66, 0x1C, 0xF3, 0xD9, 0x02, 0xB6, 0xF2, 0x12, 0x9B, 0x44, 0xD0, 0x6F, 0xB9, 0x35, 0x89, 0xB6, 0x46, 0x6D, 0x73, 0x82, 0x06, 0x69, 0xC1, 0xED, 0xD7, 0x85, 0xC2, 0x30, 0xDF, 0xA2, 0x62, 0xBE, 0x79, 0x2D, 0x62, 0x62, 0x3D, 0x0D, 0x7E, 0xBE, 0x48, 0x89, 0x23, 0x02, 0xA0, 0xE4, 0xD5, 0x75, 0x51, 0x32, 0x02, 0x53, 0xFD, 0x16, 0x3A, 0x21, 0x3B, 0x16, 0x0F, 0xC3, 0xB2, 0xBB, 0xB3, 0xE2, 0xBA, 0x3A, 0x3D, 0x13, 0xEC, 0xF6, 0x01, 0x45, 0x84, 0xA5, 0x70, 0x0F, 0x93, 0x49, 0x0C, 0x64, 0xCD, 0x31, 0xD5, 0xCC, 0x4C, 0x07, 0x01, 0x9E, 0x00, 0x1A, 0x23, 0x90, 0xBF, 0x88, 0x1E, 0x3B, 0xAB, 0xA6, 0x3E, 0xC4, 0x73, 0x47, 0x10, 0x7E, 0x3B, 0x5E, 0xBC, 0xE3, 0x00, 0x84, 0xFF, 0x09, 0xD4, 0xE0, 0x89, 0x0F, 0x5B, 0x58, 0x70, 0x4F, 0xFB, 0x65, 0xD8, 0x5C, 0x53, 0x1B, 0xD3, 0xC8, 0xC6, 0xBF, 0xEF, 0x98, 0xB0, 0x50, 0x4F, 0x0F, 0xEA, 0xE5, 0x83, 0x58, 0x8C, 0x28, 0x2C, 0x84, 0x67, 0xCD, 0xD0, 0x9E, 0x47, 0xDB, 0x27, 0x50, 0xCA, 0xF4, 0x63, 0x63, 0xE8, 0x97, 0x7F, 0x1B, 0x4B, 0x0C, 0xC2, 0xC1, 0x21, 0x4C, 0xCC, 0x58, 0xF5, 0x94, 0x52, 0xA3, 0xF3, 0xD3, 0xE0, 0x68, 0xF4, 0x00, 0x23, 0xF3, 0x5E, 0x0A, 0x7B, 0x93, 0xDD, 0xAB, 0x12, 0xB2, 0x13, 0xE8, 0x84, 0xD7, 0xA7, 0x9F, 0x0F, 0x32, 0x4C, 0x55, 0x1D, 0x04, 0x36, 0x52, 0xDC, 0x03, 0xF3, 0xF9, 0x4E, 0x42, 0xE9, 0x3D, 0x61, 0xEF, 0x7C, 0xB6, 0xB3, 0x93, 0x50, ]