行车记录仪智能卡.ddd 文件签名
我制作了一个 Android 应用程序，可以通过 otg 智能卡读卡器读取卡车司机卡（从行车记录仪）。 我可以从下图中的树结构中读取卡上的所有文件。
但是当我比较我读取的数据和其他一些公共应用程序时，我注意到有些文件被闲置可能是密钥或签名的东西 
我不知道下划线部分代表什么，也不知道如何读取或生成它。
如果没有这些“签名”，我拥有的所有数据都是无用的，但是如果我在 ddd 文件中对那些带下划线的部分（来自其他应用程序）进行硬编码，一切都会正常工作
我发现的最多的是 05 04 - 当前使用数据 01 - 表示仍有签名（第 1 代） 00 80 - 0x0080 = 128 dec
我还从卡中读取了卡证书和 ca 证书，但没有发现与问题的下划线部分有任何关联。
I have made android app that reads truck driver card (from tachograph) via otg smart card reader.
I can read all files on card from tree structure on image bellow.
But when I compare data that I read, and from some other public application, I have noticed that some files are fallowed by something that might be a key or signature
I do not know what underlined part represents nor how to read or generate it.
Without those "signatures" all data that I have is useless, but if I hard code those underlined parts (from other apps) in my ddd file, everything works fine
The most I have found is that
05 04 - Current usage Data
01 - means there is still a signature (gen 1)
00 80 - 0x0080 = 128 dec
Also I have read card certificate and ca certificate from card but didn't find is there any correlation with underlined part of problem.
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多亏了@NVF，我在文档
响应的一部分。DDD以“ 01 00 80”开头代表了先前选择的文件上哈希值的数字签名。
要获得数字签名，您应该选择文件，请执行命令执行文件的哈希，然后执行命令以获取128个字节数字签名。
Thanks to @nvf I found explication and solution in document
Part of responses .ddd that start with "01 00 80" represent digital signature of hash value on previously selected file.
To get digital signature you should select file, execute command to perform hash of file, and then execute command to get 128 bytes digital signature.