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@ -8,7 +8,7 @@ import {
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} from '@/decrypt/utils';
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import { parseBlob as metaParseBlob } from 'music-metadata-browser';
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import { DecryptResult } from '@/decrypt/entity';
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import config from '@/../package.json';
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import { decryptKgmByteAtOffsetV2, decryptVprByteAtOffset } from '@jixun/kugou-crypto/dist/utils/decryptionHelper';
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//prettier-ignore
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const VprHeader = [
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@ -20,12 +20,6 @@ const KgmHeader = [
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0x7C, 0xD5, 0x32, 0xEB, 0x86, 0x02, 0x7F, 0x4B,
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0xA8, 0xAF, 0xA6, 0x8E, 0x0F, 0xFF, 0x99, 0x14
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]
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//prettier-ignore
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const VprMaskDiff = [
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0x25, 0xDF, 0xE8, 0xA6, 0x75, 0x1E, 0x75, 0x0E,
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0x2F, 0x80, 0xF3, 0x2D, 0xB8, 0xB6, 0xE3, 0x11,
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0x00
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]
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export async function Decrypt(file: File, raw_filename: string, raw_ext: string): Promise<DecryptResult> {
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const oriData = new Uint8Array(await GetArrayBuffer(file));
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@ -39,26 +33,13 @@ export async function Decrypt(file: File, raw_filename: string, raw_ext: string)
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let audioData = oriData.slice(headerLen);
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let dataLen = audioData.length;
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if (audioData.byteLength > 1 << 26) {
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throw Error("文件过大，请使用 <a target='_blank' href='https://github.com/unlock-music/cli'>CLI版本</a> 进行解锁");
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}
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let key1 = new Uint8Array(17);
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key1.set(oriData.slice(0x1c, 0x2c), 0);
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if (MaskV2.length === 0) {
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if (!(await LoadMaskV2())) throw Error('加载Kgm/Vpr Mask数据失败');
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}
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let key1 = Array.from(oriData.slice(0x1c, 0x2c));
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key1.push(0);
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const decryptByte = raw_ext === 'vpr' ? decryptVprByteAtOffset : decryptKgmByteAtOffsetV2;
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for (let i = 0; i < dataLen; i++) {
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let med8 = key1[i % 17] ^ audioData[i];
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med8 ^= (med8 & 0xf) << 4;
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let msk8 = GetMask(i);
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msk8 ^= (msk8 & 0xf) << 4;
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audioData[i] = med8 ^ msk8;
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}
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if (raw_ext === 'vpr') {
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for (let i = 0; i < dataLen; i++) audioData[i] ^= VprMaskDiff[i % 17];
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audioData[i] = decryptByte(audioData[i], key1, i);
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}
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const ext = SniffAudioExt(audioData);
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@ -77,68 +58,3 @@ export async function Decrypt(file: File, raw_filename: string, raw_ext: string)
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artist,
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};
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}
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function GetMask(pos: number) {
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return MaskV2PreDef[pos % 272] ^ MaskV2[pos >> 4];
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}
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let MaskV2: Uint8Array = new Uint8Array(0);
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async function LoadMaskV2(): Promise<boolean> {
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let mask_url = `https://cdn.jsdelivr.net/gh/unlock-music/unlock-music@${config.version}/public/static/kgm.mask`;
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if (['http:', 'https:'].some((v) => v == self.location.protocol)) {
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if (!!self.document) {
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// using Web Worker
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mask_url = './static/kgm.mask';
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} else {
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// using Main thread
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mask_url = '../static/kgm.mask';
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}
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}
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try {
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const resp = await fetch(mask_url, { method: 'GET' });
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MaskV2 = new Uint8Array(await resp.arrayBuffer());
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return true;
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} catch (e) {
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console.error(e);
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return false;
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}
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}
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//prettier-ignore
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const MaskV2PreDef = [
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0xb8, 0xd5, 0x3d, 0xb2, 0xe9, 0xaf, 0x78, 0x8c,
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0x83, 0x33, 0x71, 0x51, 0x76, 0xa0, 0xcd, 0x37,
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0x2f, 0x3e, 0x35, 0x8d, 0xa9, 0xbe, 0x98, 0xb7,
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0xe7, 0x8c, 0x22, 0xce, 0x5a, 0x61, 0xdf, 0x68,
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0x69, 0x89, 0xfe, 0xa5, 0xb6, 0xde, 0xa9, 0x77,
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0xfc, 0xc8, 0xbd, 0xbd, 0xe5, 0x6d, 0x3e, 0x5a,
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0x36, 0xef, 0x69, 0x4e, 0xbe, 0xe1, 0xe9, 0x66,
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0x1c, 0xf3, 0xd9, 0x02, 0xb6, 0xf2, 0x12, 0x9b,
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0x44, 0xd0, 0x6f, 0xb9, 0x35, 0x89, 0xb6, 0x46,
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0x6d, 0x73, 0x82, 0x06, 0x69, 0xc1, 0xed, 0xd7,
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0x85, 0xc2, 0x30, 0xdf, 0xa2, 0x62, 0xbe, 0x79,
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0x2d, 0x62, 0x62, 0x3d, 0x0d, 0x7e, 0xbe, 0x48,
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0x89, 0x23, 0x02, 0xa0, 0xe4, 0xd5, 0x75, 0x51,
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0x32, 0x02, 0x53, 0xfd, 0x16, 0x3a, 0x21, 0x3b,
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0x16, 0x0f, 0xc3, 0xb2, 0xbb, 0xb3, 0xe2, 0xba,
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0x3a, 0x3d, 0x13, 0xec, 0xf6, 0x01, 0x45, 0x84,
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0xa5, 0x70, 0x0f, 0x93, 0x49, 0x0c, 0x64, 0xcd,
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0x31, 0xd5, 0xcc, 0x4c, 0x07, 0x01, 0x9e, 0x00,
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0x1a, 0x23, 0x90, 0xbf, 0x88, 0x1e, 0x3b, 0xab,
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0xa6, 0x3e, 0xc4, 0x73, 0x47, 0x10, 0x7e, 0x3b,
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0x5e, 0xbc, 0xe3, 0x00, 0x84, 0xff, 0x09, 0xd4,
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0xe0, 0x89, 0x0f, 0x5b, 0x58, 0x70, 0x4f, 0xfb,
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0x65, 0xd8, 0x5c, 0x53, 0x1b, 0xd3, 0xc8, 0xc6,
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0xbf, 0xef, 0x98, 0xb0, 0x50, 0x4f, 0x0f, 0xea,
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0xe5, 0x83, 0x58, 0x8c, 0x28, 0x2c, 0x84, 0x67,
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0xcd, 0xd0, 0x9e, 0x47, 0xdb, 0x27, 0x50, 0xca,
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0xf4, 0x63, 0x63, 0xe8, 0x97, 0x7f, 0x1b, 0x4b,
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0x0c, 0xc2, 0xc1, 0x21, 0x4c, 0xcc, 0x58, 0xf5,
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0x94, 0x52, 0xa3, 0xf3, 0xd3, 0xe0, 0x68, 0xf4,
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0x00, 0x23, 0xf3, 0x5e, 0x0a, 0x7b, 0x93, 0xdd,
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0xab, 0x12, 0xb2, 0x13, 0xe8, 0x84, 0xd7, 0xa7,
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0x9f, 0x0f, 0x32, 0x4c, 0x55, 0x1d, 0x04, 0x36,
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0x52, 0xdc, 0x03, 0xf3, 0xf9, 0x4e, 0x42, 0xe9,
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0x3d, 0x61, 0xef, 0x7c, 0xb6, 0xb3, 0x93, 0x50,
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];
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鲁树人
3 years ago