feat: kgm unlock without large / remote mask file

package-lock.json

@@ -11,6 +11,7 @@
       "license": "MIT",
       "dependencies": {
         "@babel/preset-typescript": "^7.16.5",
+        "@jixun/kugou-crypto": "^1.0.2",
         "@jixun/qmc2-crypto": "^0.0.6-R1",
         "@unlock-music/joox-crypto": "^0.0.1-R5",
         "base64-js": "^1.5.1",
@@ -2986,6 +2987,22 @@
         "regenerator-runtime": "^0.13.3"
       }
     },
+    "node_modules/@jixun/kugou-crypto": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/@jixun/kugou-crypto/-/kugou-crypto-1.0.2.tgz",
+      "integrity": "sha512-tD2XbiS0qXB4mnDeRsh0/qc4setuVlJT2AV/FpFpp9Ruk3sGYzi7iAKypxYK5OK7emLH7zxBXs85xTmmyWjueQ==",
+      "dependencies": {
+        "commander": "^9.2.0"
+      }
+    },
+    "node_modules/@jixun/kugou-crypto/node_modules/commander": {
+      "version": "9.2.0",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-9.2.0.tgz",
+      "integrity": "sha512-e2i4wANQiSXgnrBlIatyHtP1odfUp0BbV5Y5nEGbxtIrStkEOAAzCUirvLBNXHLr7kwLvJl6V+4V3XV9x7Wd9w==",
+      "engines": {
+        "node": "^12.20.0 || >=14"
+      }
+    },
     "node_modules/@jixun/qmc2-crypto": {
       "version": "0.0.6-R1",
       "resolved": "https://registry.npmjs.org/@jixun/qmc2-crypto/-/qmc2-crypto-0.0.6-R1.tgz",
@@ -23188,6 +23205,21 @@
         "regenerator-runtime": "^0.13.3"
       }
     },
+    "@jixun/kugou-crypto": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/@jixun/kugou-crypto/-/kugou-crypto-1.0.2.tgz",
+      "integrity": "sha512-tD2XbiS0qXB4mnDeRsh0/qc4setuVlJT2AV/FpFpp9Ruk3sGYzi7iAKypxYK5OK7emLH7zxBXs85xTmmyWjueQ==",
+      "requires": {
+        "commander": "^9.2.0"
+      },
+      "dependencies": {
+        "commander": {
+          "version": "9.2.0",
+          "resolved": "https://registry.npmjs.org/commander/-/commander-9.2.0.tgz",
+          "integrity": "sha512-e2i4wANQiSXgnrBlIatyHtP1odfUp0BbV5Y5nEGbxtIrStkEOAAzCUirvLBNXHLr7kwLvJl6V+4V3XV9x7Wd9w=="
+        }
+      }
+    },
     "@jixun/qmc2-crypto": {
       "version": "0.0.6-R1",
       "resolved": "https://registry.npmjs.org/@jixun/qmc2-crypto/-/qmc2-crypto-0.0.6-R1.tgz",

package.json

@@ -21,6 +21,7 @@
   },
   "dependencies": {
     "@babel/preset-typescript": "^7.16.5",
+    "@jixun/kugou-crypto": "^1.0.2",
     "@jixun/qmc2-crypto": "^0.0.6-R1",
     "@unlock-music/joox-crypto": "^0.0.1-R5",
     "base64-js": "^1.5.1",

src/decrypt/kgm.ts

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