feat: add KWMv2 support

src/decrypt-worker/crypto/kwm/kwm.ts

@@ -1,14 +1,25 @@
 import { transformBlob } from '~/decrypt-worker/util/transformBlob';
 import type { CryptoBase } from '../CryptoBase';
 import { KWM_KEY } from './kwm.key';
+import { DecryptCommandOptions } from '~/decrypt-worker/types';
+import { makeQMCv2KeyCrypto } from '~/decrypt-worker/util/qmc2KeyCrypto';
+import { fetchParakeet } from '@jixun/libparakeet';
+import { stringToUTF8Bytes } from '~/decrypt-worker/util/utf8Encoder';
 
 // v1 only
 export class KWMCrypto implements CryptoBase {
   cryptoName = 'KWM';
   checkByDecryptHeader = true;
 
-  async decrypt(buffer: ArrayBuffer): Promise<Blob> {
-    return transformBlob(buffer, (p) => p.make.KuwoKWM(KWM_KEY));
+  async decrypt(buffer: ArrayBuffer, opts: DecryptCommandOptions): Promise<Blob> {
+    const kwm2key = opts.kwm2key ?? '';
+
+    const parakeet = await fetchParakeet();
+    const keyCrypto = makeQMCv2KeyCrypto(parakeet);
+    return transformBlob(buffer, (p) => p.make.KuwoKWMv2(KWM_KEY, stringToUTF8Bytes(kwm2key), keyCrypto), {
+      cleanup: () => keyCrypto.delete(),
+      parakeet,
+    });
   }
 
   public static make() {

src/decrypt-worker/types.ts

@@ -1,5 +1,6 @@
 export interface DecryptCommandOptions {
   qmc2Key?: string;
+  kwm2key?: string;
 }
 
 export interface DecryptCommandPayload {