📄 透明加密驱动开发心得 - laoka - 51cto技术博客-领先的it技术博客.htm
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<DIV class=posttime><SMALL>2009-01-13 17:42:59</SMALL></DIV>
<DIV style="PADDING-LEFT: 20px; WIDTH: 94%"> 标签：<SPAN style="COLOR: #aaaaaa"><A
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<DIV>最近研究文件透明加密驱动的开发,基于MiniFilter</DIV>
<DIV>具体实现方式是在一文件尾加一块我自己的数据,</DIV>
<DIV>在</DIV>
<DIV>IRP_CREATE时中通过<STRONG>FltSetInformationFile</STRONG> ()</DIV>
<DIV>去掉这个数据块</DIV>
<DIV>在CleanUp中再写上去,</DIV>
<DIV>在研究中发现,</DIV>
<DIV>若自己管理计数Ref则</DIV>
<DIV>在Create时Ref++</DIV>
<DIV>在CleanUp中Ref--</DIV>
<DIV>最后Ref为0,</DIV>
<DIV> </DIV>
<DIV>同样也可以在Close中Ref--</DIV>
<DIV> </DIV>
<DIV>区别在于CleanUp中Ref为0的时间要先于Close.</DIV>
<DIV> </DIV>
<DIV>还发现在CleanUp中,</DIV>
<DIV>若FltWriteFile以NOCACHE的方式进行，则不能成功</DIV>
<DIV>返回STATUS_NO_IMPLEMENT.</DIV>
<DIV>奇怪，原因没有弄清楚.</DIV>
<DIV> </DIV>
<DIV>原因弄清楚了，因为参数不对,</DIV>
<DIV>对于NONCACHE方式，</DIV>
<DIV>WriteBuf</DIV>
<DIV>Length</DIV>
<DIV>ByteOffset</DIV>
<DIV>都必须是SectorSize(一般为512)对齐的.</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>还有一问题是文件要对齐才好操作</DIV>
<DIV>若一个文件是300个字节的.</DIV>
<DIV> </DIV>
<DIV>|0
300|-------------Pad------------512|--------------------------Encrypt
Tail-----------1024|</DIV>
<DIV>这样处理才好,</DIV>
<DIV>方法有很多种的,</DIV>
<DIV>这只是我一家之言.</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>HaHaH...</DIV><A class=hidden
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<DIV align=right>2009-01-13 22:47:13</DIV>
<DIV class=commentcontent>好，期待你的总结哦~</DIV>
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