SnowCat 雪猫底层全源码：NapCat 4.18.28 底座 + SnowLuma 能力移植 + V8 通道适配 9.9.37

26 包 monorepo（TS 全源码）：
- snowcat-core: NT 内核 API 封装 + listener（含 9.9.37 六回调适配）+ Packet 发包
- snowcat-onebot: OneBot v11 全动作 + MCP Streamable HTTP 适配器 + 稳定线
- snowcat-webui-frontend/backend: 雪猫控制台（React+HeroUI）
- snowcat-shell: 单文件 bundle 出口（vite inlineDynamicImports）
- snowcat-native: napi2native / MoeHoo / ffmpeg / pty 运行时
- 56 项 SnowLuma 独门动作移植（qzone 全家桶/群相册/装扮/闪照/收藏）
- 工具件: 解包器/启动器/便携制作器/doctor

GitHub 关联已全量指向 DandanLLab/SnowCatQQ

packages/snowcat-core/packet/utils/crypto/tea.ts

@@ -0,0 +1,88 @@
+// love from https://github.com/LagrangeDev/lagrangejs/blob/main/src/core/tea.ts & https://github.com/takayama-lily/oicq/blob/main/lib/core/tea.ts
+
+// @ts-nocheck
+const BUF7 = Buffer.alloc(7);
+const deltas = [
+  0x9e3779b9, 0x3c6ef372, 0xdaa66d2b, 0x78dde6e4, 0x1715609d, 0xb54cda56, 0x5384540f, 0xf1bbcdc8, 0x8ff34781,
+  0x2e2ac13a, 0xcc623af3, 0x6a99b4ac, 0x08d12e65, 0xa708a81e, 0x454021d7, 0xe3779b90,
+];
+
+function _toUInt32 (num: number) {
+  return num >>> 0;
+}
+
+function _encrypt (x: number, y: number, k0: number, k1: number, k2: number, k3: number): [number, number] {
+  for (let i = 0; i < 16; ++i) {
+    let aa = ((_toUInt32(((y << 4) >>> 0) + k0) ^ _toUInt32(y + deltas[i])) >>> 0) ^ _toUInt32(~~(y / 32) + k1);
+    aa >>>= 0;
+    x = _toUInt32(x + aa);
+    let bb = ((_toUInt32(((x << 4) >>> 0) + k2) ^ _toUInt32(x + deltas[i])) >>> 0) ^ _toUInt32(~~(x / 32) + k3);
+    bb >>>= 0;
+    y = _toUInt32(y + bb);
+  }
+  return [x, y];
+}
+
+export function encrypt (data: Buffer, key: Buffer) {
+  let n = (6 - data.length) >>> 0;
+  n = (n % 8) + 2;
+  const v = Buffer.concat([Buffer.from([(n - 2) | 0xf8]), Buffer.allocUnsafe(n), data, BUF7]);
+  const k0 = key.readUInt32BE(0);
+  const k1 = key.readUInt32BE(4);
+  const k2 = key.readUInt32BE(8);
+  const k3 = key.readUInt32BE(12);
+  let r1 = 0; let r2 = 0; let t1 = 0; let t2 = 0;
+  for (let i = 0; i < v.length; i += 8) {
+    const a1 = v.readUInt32BE(i);
+    const a2 = v.readUInt32BE(i + 4);
+    const b1 = a1 ^ r1;
+    const b2 = a2 ^ r2;
+    const [x, y] = _encrypt(b1 >>> 0, b2 >>> 0, k0, k1, k2, k3);
+    r1 = x ^ t1;
+    r2 = y ^ t2;
+    t1 = b1;
+    t2 = b2;
+    v.writeInt32BE(r1, i);
+    v.writeInt32BE(r2, i + 4);
+  }
+  return v;
+}
+
+function _decrypt (x: number, y: number, k0: number, k1: number, k2: number, k3: number) {
+  for (let i = 15; i >= 0; --i) {
+    const aa = ((_toUInt32(((x << 4) >>> 0) + k2) ^ _toUInt32(x + deltas[i])) >>> 0) ^ _toUInt32(~~(x / 32) + k3);
+    y = (y - aa) >>> 0;
+    const bb = ((_toUInt32(((y << 4) >>> 0) + k0) ^ _toUInt32(y + deltas[i])) >>> 0) ^ _toUInt32(~~(y / 32) + k1);
+    x = (x - bb) >>> 0;
+  }
+  return [x, y];
+}
+
+export function decrypt (encrypted: Buffer, key: Buffer) {
+  if (encrypted.length % 8) throw ERROR_ENCRYPTED_LENGTH;
+  const k0 = key.readUInt32BE(0);
+  const k1 = key.readUInt32BE(4);
+  const k2 = key.readUInt32BE(8);
+  const k3 = key.readUInt32BE(12);
+  let r1 = 0; let r2 = 0; let t1 = 0; let t2 = 0; let x = 0; let y = 0;
+  for (let i = 0; i < encrypted.length; i += 8) {
+    const a1 = encrypted.readUInt32BE(i);
+    const a2 = encrypted.readUInt32BE(i + 4);
+    const b1 = a1 ^ x;
+    const b2 = a2 ^ y;
+    [x, y] = _decrypt(b1 >>> 0, b2 >>> 0, k0, k1, k2, k3);
+    r1 = x ^ t1;
+    r2 = y ^ t2;
+    t1 = a1;
+    t2 = a2;
+    encrypted.writeInt32BE(r1, i);
+    encrypted.writeInt32BE(r2, i + 4);
+  }
+  if (Buffer.compare(encrypted.subarray(encrypted.length - 7), BUF7) !== 0) throw ERROR_ENCRYPTED_ILLEGAL;
+  // if (Buffer.compare(encrypted.slice(encrypted.length - 7), BUF7) !== 0) throw ERROR_ENCRYPTED_ILLEGAL;
+  return encrypted.subarray((encrypted[0] & 0x07) + 3, encrypted.length - 7);
+  // return encrypted.slice((encrypted[0] & 0x07) + 3, encrypted.length - 7);
+}
+
+const ERROR_ENCRYPTED_LENGTH = new Error('length of encrypted data must be a multiple of 8');
+const ERROR_ENCRYPTED_ILLEGAL = new Error('encrypted data is illegal');