feat: added support for QMCv2 (#11)

package.json

@@ -14,7 +14,7 @@
     "@chakra-ui/react": "^2.6.1",
     "@emotion/react": "^11.11.0",
     "@emotion/styled": "^11.11.0",
-    "@jixun/libparakeet": "0.0.0-exp.12",
+    "@jixun/libparakeet": "0.0.0-exp.16",
     "@reduxjs/toolkit": "^1.9.5",
     "framer-motion": "^10.12.8",
     "nanoid": "^4.0.2",

pnpm-lock.yaml

@@ -14,8 +14,8 @@ dependencies:
     specifier: ^11.11.0
     version: 11.11.0(@emotion/react@11.11.0)(@types/react@18.0.28)(react@18.2.0)
   '@jixun/libparakeet':
-    specifier: 0.0.0-exp.12
-    version: 0.0.0-exp.12
+    specifier: 0.0.0-exp.16
+    version: 0.0.0-exp.16
   '@reduxjs/toolkit':
     specifier: ^1.9.5
     version: 1.9.5(react-redux@8.0.5)(react@18.2.0)
@@ -1780,8 +1780,8 @@ packages:
     resolution: {integrity: sha512-ZnQMnLV4e7hDlUvw8H+U8ASL02SS2Gn6+9Ac3wGGLIe7+je2AeAOxPY+izIPJDfFDb7eDjev0Us8MO1iFRN8hA==}
     dev: true
 
-  /@jixun/libparakeet@0.0.0-exp.12:
-    resolution: {integrity: sha512-vtXUSDJMnirr8bz1oG29K+sfDz7T7V+tC4rnzS5Xon3wrUZq5Eth2icPMDYYC5UWEgfxEy/qr19/Em59v492nA==}
+  /@jixun/libparakeet@0.0.0-exp.16:
+    resolution: {integrity: sha512-jDj9kju0tCJyesV+yi4xcOGClrFgdarkcG/aGP3tRfonf1l8y11A8lVwbp3cWXJcrgHAn7683rTEUYitg9TfpA==}
     dev: false
 
   /@jridgewell/gen-mapping@0.3.3:

src/decrypt-worker/crypto/CryptoBase.ts

@@ -1,4 +1,8 @@
 export interface CryptoBase {
+  /**
+   * When returning false, a successful decryption should be checked by its decrypted content instead.
+   */
+  hasSignature(): boolean;
   isSupported(blob: Blob): Promise<boolean>;
   decrypt(blob: Blob): Promise<Blob>;
 }

src/decrypt-worker/crypto/qmc/qmc_v1.key.ts

@@ -0,0 +1,16 @@
+export default new Uint8Array([
+  0x77, 0x48, 0x32, 0x73, 0xde, 0xf2, 0xc0, 0xc8, 0x95, 0xec, 0x30, 0xb2, 0x51, 0xc3, 0xe1, 0xa0, 0x9e, 0xe6, 0x9d,
+  0xcf, 0xfa, 0x7f, 0x14, 0xd1, 0xce, 0xb8, 0xdc, 0xc3, 0x4a, 0x67, 0x93, 0xd6, 0x28, 0xc2, 0x91, 0x70, 0xca, 0x8d,
+  0xa2, 0xa4, 0xf0, 0x08, 0x61, 0x90, 0x7e, 0x6f, 0xa2, 0xe0, 0xeb, 0xae, 0x3e, 0xb6, 0x67, 0xc7, 0x92, 0xf4, 0x91,
+  0xb5, 0xf6, 0x6c, 0x5e, 0x84, 0x40, 0xf7, 0xf3, 0x1b, 0x02, 0x7f, 0xd5, 0xab, 0x41, 0x89, 0x28, 0xf4, 0x25, 0xcc,
+  0x52, 0x11, 0xad, 0x43, 0x68, 0xa6, 0x41, 0x8b, 0x84, 0xb5, 0xff, 0x2c, 0x92, 0x4a, 0x26, 0xd8, 0x47, 0x6a, 0x7c,
+  0x95, 0x61, 0xcc, 0xe6, 0xcb, 0xbb, 0x3f, 0x47, 0x58, 0x89, 0x75, 0xc3, 0x75, 0xa1, 0xd9, 0xaf, 0xcc, 0x08, 0x73,
+  0x17, 0xdc, 0xaa, 0x9a, 0xa2, 0x16, 0x41, 0xd8, 0xa2, 0x06, 0xc6, 0x8b, 0xfc, 0x66, 0x34, 0x9f, 0xcf, 0x18, 0x23,
+  0xa0, 0x0a, 0x74, 0xe7, 0x2b, 0x27, 0x70, 0x92, 0xe9, 0xaf, 0x37, 0xe6, 0x8c, 0xa7, 0xbc, 0x62, 0x65, 0x9c, 0xc2,
+  0x08, 0xc9, 0x88, 0xb3, 0xf3, 0x43, 0xac, 0x74, 0x2c, 0x0f, 0xd4, 0xaf, 0xa1, 0xc3, 0x01, 0x64, 0x95, 0x4e, 0x48,
+  0x9f, 0xf4, 0x35, 0x78, 0x95, 0x7a, 0x39, 0xd6, 0x6a, 0xa0, 0x6d, 0x40, 0xe8, 0x4f, 0xa8, 0xef, 0x11, 0x1d, 0xf3,
+  0x1b, 0x3f, 0x3f, 0x07, 0xdd, 0x6f, 0x5b, 0x19, 0x30, 0x19, 0xfb, 0xef, 0x0e, 0x37, 0xf0, 0x0e, 0xcd, 0x16, 0x49,
+  0xfe, 0x53, 0x47, 0x13, 0x1a, 0xbd, 0xa4, 0xf1, 0x40, 0x19, 0x60, 0x0e, 0xed, 0x68, 0x09, 0x06, 0x5f, 0x4d, 0xcf,
+  0x3d, 0x1a, 0xfe, 0x20, 0x77, 0xe4, 0xd9, 0xda, 0xf9, 0xa4, 0x2b, 0x76, 0x1c, 0x71, 0xdb, 0x00, 0xbc, 0xfd, 0x0c,
+  0x6c, 0xa5, 0x47, 0xf7, 0xf6, 0x00, 0x79, 0x4a, 0x11,
+]);

src/decrypt-worker/crypto/qmc/qmc_v1.ts

@@ -1,51 +1,17 @@
+import { transformBlob } from '~/decrypt-worker/util/transformBlob';
 import type { CryptoBase } from '../CryptoBase';
-import { loadLibParakeet, factory, BlobSink, createArrayBufferReader, TransformResult } from '@jixun/libparakeet';
-
-const key = new Uint8Array([
-  0x77, 0x48, 0x32, 0x73, 0xde, 0xf2, 0xc0, 0xc8, 0x95, 0xec, 0x30, 0xb2, 0x51, 0xc3, 0xe1, 0xa0, 0x9e, 0xe6, 0x9d,
-  0xcf, 0xfa, 0x7f, 0x14, 0xd1, 0xce, 0xb8, 0xdc, 0xc3, 0x4a, 0x67, 0x93, 0xd6, 0x28, 0xc2, 0x91, 0x70, 0xca, 0x8d,
-  0xa2, 0xa4, 0xf0, 0x08, 0x61, 0x90, 0x7e, 0x6f, 0xa2, 0xe0, 0xeb, 0xae, 0x3e, 0xb6, 0x67, 0xc7, 0x92, 0xf4, 0x91,
-  0xb5, 0xf6, 0x6c, 0x5e, 0x84, 0x40, 0xf7, 0xf3, 0x1b, 0x02, 0x7f, 0xd5, 0xab, 0x41, 0x89, 0x28, 0xf4, 0x25, 0xcc,
-  0x52, 0x11, 0xad, 0x43, 0x68, 0xa6, 0x41, 0x8b, 0x84, 0xb5, 0xff, 0x2c, 0x92, 0x4a, 0x26, 0xd8, 0x47, 0x6a, 0x7c,
-  0x95, 0x61, 0xcc, 0xe6, 0xcb, 0xbb, 0x3f, 0x47, 0x58, 0x89, 0x75, 0xc3, 0x75, 0xa1, 0xd9, 0xaf, 0xcc, 0x08, 0x73,
-  0x17, 0xdc, 0xaa, 0x9a, 0xa2, 0x16, 0x41, 0xd8, 0xa2, 0x06, 0xc6, 0x8b, 0xfc, 0x66, 0x34, 0x9f, 0xcf, 0x18, 0x23,
-  0xa0, 0x0a, 0x74, 0xe7, 0x2b, 0x27, 0x70, 0x92, 0xe9, 0xaf, 0x37, 0xe6, 0x8c, 0xa7, 0xbc, 0x62, 0x65, 0x9c, 0xc2,
-  0x08, 0xc9, 0x88, 0xb3, 0xf3, 0x43, 0xac, 0x74, 0x2c, 0x0f, 0xd4, 0xaf, 0xa1, 0xc3, 0x01, 0x64, 0x95, 0x4e, 0x48,
-  0x9f, 0xf4, 0x35, 0x78, 0x95, 0x7a, 0x39, 0xd6, 0x6a, 0xa0, 0x6d, 0x40, 0xe8, 0x4f, 0xa8, 0xef, 0x11, 0x1d, 0xf3,
-  0x1b, 0x3f, 0x3f, 0x07, 0xdd, 0x6f, 0x5b, 0x19, 0x30, 0x19, 0xfb, 0xef, 0x0e, 0x37, 0xf0, 0x0e, 0xcd, 0x16, 0x49,
-  0xfe, 0x53, 0x47, 0x13, 0x1a, 0xbd, 0xa4, 0xf1, 0x40, 0x19, 0x60, 0x0e, 0xed, 0x68, 0x09, 0x06, 0x5f, 0x4d, 0xcf,
-  0x3d, 0x1a, 0xfe, 0x20, 0x77, 0xe4, 0xd9, 0xda, 0xf9, 0xa4, 0x2b, 0x76, 0x1c, 0x71, 0xdb, 0x00, 0xbc, 0xfd, 0x0c,
-  0x6c, 0xa5, 0x47, 0xf7, 0xf6, 0x00, 0x79, 0x4a, 0x11,
-]);
+import key from './qmc_v1.key.ts';
 
 export class QMC1Crypto implements CryptoBase {
-  async isSupported(_blob: Blob): Promise<boolean> {
+  hasSignature(): boolean {
+    return false;
+  }
+
+  async isSupported(): Promise<boolean> {
     return true;
   }
 
   async decrypt(blob: Blob): Promise<Blob> {
-    const cleanup: (() => void)[] = [];
-
-    try {
-      const mod = await loadLibParakeet();
-      const transformer = factory.CreateQMCv1Transformer(mod, key);
-      cleanup.push(() => transformer.delete());
-
-      const reader = createArrayBufferReader(await blob.arrayBuffer(), mod);
-      cleanup.push(() => reader.delete());
-
-      const sink = new BlobSink(mod);
-      const writer = sink.getWriter();
-      cleanup.push(() => writer.delete());
-
-      const result = transformer.Transform(writer, reader);
-      if (result !== TransformResult.OK) {
-        throw new Error(`transform failed with error: ${TransformResult[result]} (${result})`);
-      }
-
-      return sink.collectBlob();
-    } finally {
-      cleanup.forEach((clean) => clean());
-    }
+    return transformBlob(blob, (p) => p.make.QMCv1(key));
   }
 }

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

@@ -0,0 +1,3 @@
+export const SEED = 106;
+export const ENC_V2_KEY_1 = '386ZJY!@#*$%^&)(';
+export const ENC_V2_KEY_2 = '**#!(#$%&^a1cZ,T';

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)));
+  }
+}

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

@@ -23,6 +23,10 @@ const u8Sub = (a: number, b: number) => {
 };
 
 export class XiamiCrypto implements CryptoBase {
+  hasSignature(): boolean {
+    return true;
+  }
+
   async isSupported(blob: Blob): Promise<boolean> {
     const headerBuffer = await blob.slice(0, 0x10).arrayBuffer();
     const header = new Uint8Array(headerBuffer);

src/decrypt-worker/util/transformBlob.ts

@@ -0,0 +1,31 @@
+import { Transformer, Parakeet, TransformResult, fetchParakeet } from '@jixun/libparakeet';
+
+export async function transformBlob(
+  blob: Blob,
+  transformerFactory: (p: Parakeet) => Transformer | Promise<Transformer>,
+  parakeet?: Parakeet
+) {
+  const cleanup: (() => void)[] = [];
+
+  try {
+    const mod = parakeet ?? (await fetchParakeet());
+    const transformer = await transformerFactory(mod);
+    cleanup.push(() => transformer.delete());
+
+    const reader = mod.make.Reader(await blob.arrayBuffer());
+    cleanup.push(() => reader.delete());
+
+    const sink = mod.make.WriterSink();
+    const writer = sink.getWriter();
+    cleanup.push(() => writer.delete());
+
+    const result = transformer.Transform(writer, reader);
+    if (result !== TransformResult.OK) {
+      throw new Error(`transform failed with error: ${TransformResult[result]} (${result})`);
+    }
+
+    return sink.collectBlob();
+  } finally {
+    cleanup.forEach((clean) => clean());
+  }
+}

src/decrypt-worker/worker.ts

@@ -2,8 +2,11 @@ import { WorkerServerBus } from '~/util/WorkerEventBus';
 import { DECRYPTION_WORKER_ACTION_NAME } from './constants';
 
 import type { CryptoFactory } from './crypto/CryptoBase';
+import { fetchParakeet } from '@jixun/libparakeet';
+
 import { XiamiCrypto } from './crypto/xiami/xiami';
 import { QMC1Crypto } from './crypto/qmc/qmc_v1';
+import { QMC2Crypto } from './crypto/qmc/qmc_v2';
 
 const bus = new WorkerServerBus();
 onmessage = bus.onmessage;
@@ -14,16 +17,37 @@ const decryptorFactories: CryptoFactory[] = [
 
   // QMCv1 (*.qmcflac)
   () => new QMC1Crypto(),
+
+  // QMCv2 (*.mflac)
+  () => new QMC2Crypto(),
 ];
 
+// Use first 4MiB of the file to perform check.
+const TEST_FILE_HEADER_LEN = 1024 * 1024 * 4;
+
 bus.addEventHandler(DECRYPTION_WORKER_ACTION_NAME.DECRYPT, async (blobURI) => {
   const blob = await fetch(blobURI).then((r) => r.blob());
+  const parakeet = await fetchParakeet();
 
   for (const factory of decryptorFactories) {
     const decryptor = factory();
     if (await decryptor.isSupported(blob)) {
-      const decrypted = await decryptor.decrypt(blob);
-      return { decrypted: URL.createObjectURL(decrypted) };
+      try {
+        const decryptedBlob = await decryptor.decrypt(blob);
+
+        // Check if we had a successful decryption
+        const header = await decryptedBlob.slice(0, TEST_FILE_HEADER_LEN).arrayBuffer();
+        const audioExt = parakeet.detectAudioExtension(header);
+        if (!decryptor.hasSignature() && audioExt === 'bin') {
+          // skip this decryptor result
+          continue;
+        }
+
+        return { decrypted: URL.createObjectURL(decryptedBlob), ext: audioExt };
+      } catch (error) {
+        console.error('decrypt failed: ', error);
+        continue;
+      }
     }
   }