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83 lines
2.4 KiB
Markdown
83 lines
2.4 KiB
Markdown
# NcmMiao :tada:
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[](https://github.com/Lkhsss/NcmMiao/actions/workflows/build.yml)
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一个使用Rust语言编写的ncm文件解密工具😆。
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### 功能及特点
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- 支持单一文件，多文件夹递归批量解密。
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- 完善的日志功能
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- Colorful
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- 编译文件小，解密快
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- 支持自动添加封面！
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- 自动打开输出文件夹
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- 简约美观
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## 编译
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```
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cargo build -r
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```
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## 使用
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支持单一文件，多文件夹递归批量解密。
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```
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ncmmiao [OPTIONS]
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Options:
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-w, --workers <WORKERS> 并发的最大线程数，默认为8线程(性能还行的话建议直接32-64，嘎嘎快)
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-i, --input <输入文件/目录> 需要解密的文件夹或文件
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-o, --output <输出目录> 输出目录 [default: NcmmiaoOutput]
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-f, --forcesave 强制覆盖保存开关
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-a, --autoopen 自动打开输出目录
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```
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~~输出文件夹在output。等我想写了再写命令行解析（bushi。~~ 写了写了
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---
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# TODO :construction:
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- [x] 多线程支持
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- [x] 自动添加封面
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- [x] 解密进度条
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- [x] 命令行解析
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- [x] 自定义输出文件夹
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- [x] 计时功能
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- [x] 自动覆盖开关
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---
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# [Changelog](CHANGELOG.md)
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---
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# 附 - ncm文件结构
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|信息|大小|作用|
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|:-:|:-:|:-:|
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|Magic Header|8 bytes|文件头|
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|Gap|2 bytes||
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|Key Length|4 bytes|RC4密钥长度，字节是按小端排序。|
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|Key Data|Key Length|RC4密钥|
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|Music Info Length|4 bytes|用AES128加密后的音乐相关信息的长度，小端排序。|
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|Music Info Data|Music Info Length|Json格式音乐信息数据。|
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|Gap|5 bytes||
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|CRC校验码|4 bytes|图片的CRC32校验码，小端排序。|
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|Image Size|4 bytes|图片的大小|
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|Image Data|Image Size|图片数据|
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|Music Data||音乐数据|
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---
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### Magic Header
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### Key Data
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用AES128加密后的RC4密钥。
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1. 先按字节对0x64进行异或。
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2. AES解密,去除填充部分。
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3. 去除最前面'neteasecloudmusic'17个字节，得到RC4密钥。
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### Music Info Data
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Json格式音乐信息数据。
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1. 按字节对0x63进行异或。
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2. 去除最前面22个字节。
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3. Base64进行解码。
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4. AES解密。
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6. 去除前面6个字节，后面数量为最后一个字节的字节数的垃圾数据，得到Json数据。
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### Music Data
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1. RC4-KSA生成S盒。
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2. 用S盒解密(自定义的解密方法)，不是RC4-PRGA解密。
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