feat: added support for QMCv2 (#11)

src/decrypt-worker/crypto/qmc/qmc_v2.ts

@@ -0,0 +1,17 @@
+import { transformBlob } from '~/decrypt-worker/util/transformBlob';
+import type { CryptoBase } from '../CryptoBase';
+import { SEED, ENC_V2_KEY_1, ENC_V2_KEY_2 } from './qmc_v2.key.ts';
+
+export class QMC2Crypto implements CryptoBase {
+  hasSignature(): boolean {
+    return false;
+  }
+
+  async isSupported(): Promise<boolean> {
+    return true;
+  }
+
+  async decrypt(blob: Blob): Promise<Blob> {
+    return transformBlob(blob, (p) => p.make.QMCv2(p.make.QMCv2FooterParser(SEED, ENC_V2_KEY_1, ENC_V2_KEY_2)));
+  }
+}