ahdoawhfo/web
1
0
Fork 0
mirror of https://git.um-react.app/um/web.git synced 2025-12-16 04:03:02 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

all: format with prettier

Browse Source 
(cherry picked from commit cad5b4d7deba4fbe4a40a17306ce49d3b2f13139)
This commit is contained in:
MengYX
2021-12-18 21:55:31 +08:00
parent 19486d4d34
commit 76dd78130a
34 changed files with 1652 additions and 1705 deletions
Download Patch File Download Diff File Expand all files Collapse all files

115
src/decrypt/kwm.ts
View File

@@ -1,77 +1,74 @@
import {
AudioMimeType,
BytesHasPrefix,
GetArrayBuffer,
GetCoverFromFile,
GetMetaFromFile,
SniffAudioExt
} from "@/decrypt/utils";
import {Decrypt as RawDecrypt} from "@/decrypt/raw";
AudioMimeType,
BytesHasPrefix,
GetArrayBuffer,
GetCoverFromFile,
GetMetaFromFile,
SniffAudioExt,
} from '@/decrypt/utils';
import { Decrypt as RawDecrypt } from '@/decrypt/raw';
import {parseBlob as metaParseBlob} from "music-metadata-browser";
import {DecryptResult} from "@/decrypt/entity";
import { parseBlob as metaParseBlob } from 'music-metadata-browser';
import { DecryptResult } from '@/decrypt/entity';
//prettier-ignore
const MagicHeader = [
0x79, 0x65, 0x65, 0x6C, 0x69, 0x6F, 0x6E, 0x2D,
0x6B, 0x75, 0x77, 0x6F, 0x2D, 0x74, 0x6D, 0x65,
0x79, 0x65, 0x65, 0x6C, 0x69, 0x6F, 0x6E, 0x2D,
0x6B, 0x75, 0x77, 0x6F, 0x2D, 0x74, 0x6D, 0x65,
]
const PreDefinedKey = "MoOtOiTvINGwd2E6n0E1i7L5t2IoOoNk"
const PreDefinedKey = 'MoOtOiTvINGwd2E6n0E1i7L5t2IoOoNk';
export async function Decrypt(file: File, raw_filename: string, _: string): Promise<DecryptResult> {
const oriData = new Uint8Array(await GetArrayBuffer(file));
if (!BytesHasPrefix(oriData, MagicHeader)) {
if (SniffAudioExt(oriData) === "aac") {
return await RawDecrypt(file, raw_filename, "aac", false)
}
throw Error("not a valid kwm file")
const oriData = new Uint8Array(await GetArrayBuffer(file));
if (!BytesHasPrefix(oriData, MagicHeader)) {
if (SniffAudioExt(oriData) === 'aac') {
return await RawDecrypt(file, raw_filename, 'aac', false);
}
throw Error('not a valid kwm file');
}
let fileKey = oriData.slice(0x18, 0x20)
let mask = createMaskFromKey(fileKey)
let audioData = oriData.slice(0x400);
let lenAudioData = audioData.length;
for (let cur = 0; cur < lenAudioData; ++cur)
audioData[cur] ^= mask[cur % 0x20];
let fileKey = oriData.slice(0x18, 0x20);
let mask = createMaskFromKey(fileKey);
let audioData = oriData.slice(0x400);
let lenAudioData = audioData.length;
for (let cur = 0; cur < lenAudioData; ++cur) audioData[cur] ^= mask[cur % 0x20];
const ext = SniffAudioExt(audioData);
const mime = AudioMimeType[ext];
let musicBlob = new Blob([audioData], { type: mime });
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,
mime,
title,
artist,
ext
}
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,
mime,
title,
artist,
ext,
};
}
function createMaskFromKey(keyBytes: Uint8Array): Uint8Array {
let keyView = new DataView(keyBytes.buffer)
let keyStr = keyView.getBigUint64(0, true).toString()
let keyStrTrim = trimKey(keyStr)
let key = new Uint8Array(32)
for (let i = 0; i < 32; i++) {
key[i] = PreDefinedKey.charCodeAt(i) ^ keyStrTrim.charCodeAt(i)
}
return key
let keyView = new DataView(keyBytes.buffer);
let keyStr = keyView.getBigUint64(0, true).toString();
let keyStrTrim = trimKey(keyStr);
let key = new Uint8Array(32);
for (let i = 0; i < 32; i++) {
key[i] = PreDefinedKey.charCodeAt(i) ^ keyStrTrim.charCodeAt(i);
}
return key;
}
function trimKey(keyRaw: string): string {
let lenRaw = keyRaw.length;
let out = keyRaw;
if (lenRaw > 32) {
out = keyRaw.slice(0, 32)
} else if (lenRaw < 32) {
out = keyRaw.padEnd(32, keyRaw)
}
return out
let lenRaw = keyRaw.length;
let out = keyRaw;
if (lenRaw > 32) {
out = keyRaw.slice(0, 32);
} else if (lenRaw < 32) {
out = keyRaw.padEnd(32, keyRaw);
}
return out;
}