sfilter文件加密新问题，请大家给我解决下

我这个加密的结果也就是保存文件都是明文，不是密文，请大家给我看看阿，还有打开的文件也都是明文。怎么办啊
void RC(unsigned char * pBuffer, int iBufferLen)
{

unsigned short counter;
counter = 0;
for(counter = 0; counter < iBufferLen; counter ++)
{
pBuffer[counter] = \'a\'+1;//~pBuffer[counter];
}
counter=counter;

}

NTSTATUS
SpyRead(
    IN PDEVICE_OBJECT DeviceObject,
    IN PIRP Irp
    )
{
    PDEVICE_EXTENSION      extension;
PDEVICE_OBJECT         attachedDevice;
PIO_STACK_LOCATION     irpSp = IoGetCurrentIrpStackLocation(Irp);
NTSTATUS               status;
ULONG                  l1;
PFILE_OBJECT           file  = irpSp->FileObject;
LARGE_INTEGER          offset = irpSp->Parameters.Read.ByteOffset;
ULONG                  length = irpSp->Parameters.Read.Length;
PVOID                  pTempBuffer;

if((DeviceObject == gControlDeviceObject)||length==0)
{
DbgPrint(\"xxexit\");
   
   return SpyPassThrough( DeviceObject, Irp );
}
  

extension        =    DeviceObject->DeviceExtension;
attachedDevice   =    extension->NextDriverDeviceObject;

if(extension->NextDriverDeviceObject==NULL)
{
   IoSkipCurrentIrpStackLocation(Irp);
DbgPrint(\"xx111111111eeeee1\");
return IoCallDriver(attachedDevice,Irp);
}
 

   if (Irp->MdlAddress)
{
pTempBuffer = MmGetSystemAddressForMdlSafe(Irp->MdlAddress, NormalPagePriority);
}
else
{
pTempBuffer = Irp->UserBuffer;
}
    IoSkipCurrentIrpStackLocation(Irp);
    status = IoCallDriver(attachedDevice,Irp);
    
length = Irp->IoStatus.Information;
if(length>0)
RC(pTempBuffer,length );
l1 = Irp->IoStatus.Information;
DbgPrint(\"begin SpyRead &frac12;&acirc;&Atilde;&Uuml;=%d\\n\",l1);
  

   return status;
  

}


NTSTATUS
SfErp(
    IN PDEVICE_OBJECT DeviceObject,
    IN PIRP Irp,
    IN PVOID Context
    )
{

   PGB  data;
PVOID pTempBuffer;

if (Irp->MdlAddress)
{
pTempBuffer = MmGetSystemAddressForMdlSafe(Irp->MdlAddress, NormalPagePriority);
}
else
{
pTempBuffer = Irp->UserBuffer;
}

data =(PGB)Context;
RtlCopyMemory(data->dest ,data->source, data->Len);
    ExFreePool(data->source);
    ExFreePool(data);

    if (Irp->PendingReturned)
{
        IoMarkIrpPending( Irp );
    }

    return STATUS_SUCCESS;
}

NTSTATUS
SpyWrite(
    IN PDEVICE_OBJECT DeviceObject,
    IN PIRP Irp
    )
{
    PDEVICE_EXTENSION      extension;
PDEVICE_OBJECT         attachedDevice;
PIO_STACK_LOCATION     irpSp = IoGetCurrentIrpStackLocation(Irp);
NTSTATUS               status;
PFILE_OBJECT           file  = irpSp->FileObject;
LARGE_INTEGER          offset = irpSp->Parameters.Write.ByteOffset;
ULONG                  length = irpSp->Parameters.Write.Length;
ULONG                  l1;
PVOID                  pTempBuffer;
PVOID                  SysDataBufFirst;
PGB  data;
PIO_STACK_LOCATION nextIrpSp;



if(DeviceObject == gControlDeviceObject||length==0)
{
DbgPrint(\"xx&sup2;&raquo;&ETH;è&Ograve;&ordf;&frac14;&Oacute;&Atilde;&Uuml; exit\\n\");

return SpyPassThrough( DeviceObject, Irp );


}

   // if(1||Irp->Flags&IRP_NOCACHE||Irp->Flags&IRP_PAGING_IO||Irp->Flags&IRP_SYNCHRONOUS_PAGING_IO)
if((Irp->Flags & IRP_PAGING_IO) ||
(Irp->Flags & IRP_SYNCHRONOUS_PAGING_IO) || (Irp->Flags & IRP_NOCACHE))
{


extension        =    DeviceObject->DeviceExtension;
attachedDevice   =    extension->NextDriverDeviceObject;


if(extension->NextDriverDeviceObject==NULL)
{
IoSkipCurrentIrpStackLocation(Irp);
return IoCallDriver(attachedDevice,Irp);
}



if (Irp->MdlAddress)
{
pTempBuffer = MmGetSystemAddressForMdlSafe(Irp->MdlAddress, NormalPagePriority);
}
else
{
pTempBuffer = Irp->UserBuffer;
}

DbgPrint(\"&iquest;&ordf;&Ecirc;&frac14;&frac14;&Oacute;&Atilde;&Uuml; exit\\n\");

 
SysDataBufFirst = ExAllocatePool(NonPagedPool,length);
RtlCopyMemory(SysDataBufFirst,pTempBuffer,length);


RC(pTempBuffer,length);

   

/*
nextIrpSp = IoGetNextIrpStackLocation( Irp );
RtlMoveMemory( nextIrpSp, irpSp, sizeof( IO_STACK_LOCATION ) );
        */

   IoCopyCurrentIrpStackLocationToNext(Irp);

data = ExAllocatePool(NonPagedPool,sizeof(GB));
data->source= SysDataBufFirst;
data->dest = pTempBuffer;
data->Len = length;

IoSetCompletionRoutine(
            Irp,
            SfErp,
            (PGB)data,
            TRUE,
            TRUE,
            TRUE
            );

status=IoCallDriver(attachedDevice,Irp);
      

l1 = Irp->IoStatus.Information;
/*
CcFlushCache(irpSp->FileObject->SectionObjectPointer,NULL,0,NULL);
CcPurgeCacheSection(irpSp->FileObject->SectionObjectPointer,NULL,0,TRUE);
*/
DbgPrint(\"begin SpyRead  sparcle     &frac14;&Oacute;&Atilde;&Uuml;=%d\\n\",l1);

return status;

}
else
{
DbgPrint(\"&sup2;&Icirc;&Ecirc;&yacute;&sup2;&raquo;&para;&Ocirc;,&sup2;&raquo;&ETH;è&Ograve;&ordf;&frac14;&Oacute;&Atilde;&Uuml; exit\\n\");

return SpyPassThrough( DeviceObject, Irp );

}

}

read解密最好在完成历程中处理。

这个程序就是在把其他分区的内容拷贝到加密盘时就出现错误
页中断 错误号3
其他都好像可以的

word可以吗？

刷新cache了吗，我以前也出现过这种情况，读取出来的总是明文，其实磁盘上存放的是密文，只不过文件被打开一次以后就在cache当中了，以后再打开就是明文。

如何刷新cache，可不可以给我个例子阿，谢谢楼上的

如何刷新cache，可不可以给我个例子阿，谢谢楼上的

CcFlushCache：刷新高速缓存中的数据到磁盘上；
CcPurgeCacheSection：要清空高速缓存中的数据使用。

CcFlushCache：刷新高速缓存中的数据到磁盘上；
CcPurgeCacheSection：要清空高速缓存中的数据使用
这几个函数在那里用阿
fslife给一个实例阿

这个很简单的，可以将它们放在IRP_MJ_CLOSE的处理例程里。
下面是它们的声明：
NTKERNELAPI
BOOLEAN
CcPurgeCacheSection (
IN PSECTION_OBJECT_POINTERS SectionObjectPointer,
IN PLARGE_INTEGER FileOffset OPTIONAL,
IN ULONG Length,
IN BOOLEAN UninitializeCacheMaps
);

NTKERNELAPI
VOID
CcFlushCache (
 IN PSECTION_OBJECT_POINTERS SectionObjectPointer,
 IN PLARGE_INTEGER FileOffset OPTIONAL,
 IN ULONG Length,
 OUT PIO_STATUS_BLOCK IoStatus OPTIONAL
 );