MIT License

Copyright (c) 2026 dsh-deepseek-web-search contributors

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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## 第三方代码

`lib/pow.js` 的 DeepSeekHashV1 实现（含 KECCAK-p[1600,23] 置换、增量 nonce 搜索
与 `x-ds-pow-response` 包装）移植自 magpie-deepseekweb2api：

    magpie-deepseekweb2api
    https://github.com/mu-zi-lee/magpie-deepseekweb2api
    MIT License, Copyright (c) 2026 木子不是木子狸

移植方式：算法、常量、字节序与搜索结构保持不变；仅收敛接口（导出 `sha3Digest` /
`deepSeekHashV1` / `solvePow` / `solvePowAsync` / `powHeader`）并改写注释。

`test/fixtures/search-stream.txt` 的帧结构依据一份公开的 chat.deepseek.com
联网搜索实测抓包整理，字段名与事件顺序未改动，内容为示例数据。