使用这样的 file.$encrypt$  文件标志。会有什么问题呢？
我的程序简单跑的没问题。遇到大文件处理。比如安装OFFICE 。需要建立Temp目录下很多临时文件。这时候就坏掉了。有时候出现文件损坏，或文件标志没有。导致无法解密。目录下的相同扩展名的标志文件小于这种扩展名的文件。
tooflat 指点一下哦。

这个函数有什么用处？

#define FAT_NTC_FCB                        0x0502
#define NTFS_NTC_FCB                    0x0705

BOOLEAN
SfIsObjectFile(
               IN PFILE_OBJECT FileObject
               )
{
    PFSRTL_COMMON_FCB_HEADER fcb = (PFSRTL_COMMON_FCB_HEADER) FileObject->FsContext;

//    KdPrint(("sfilter!SfIsObjectFile: fcb->NodeTypeCode = %x\n", fcb->NodeTypeCode));

    if (fcb->NodeTypeCode == FAT_NTC_FCB)
        return TRUE;
    else if (fcb->NodeTypeCode == NTFS_NTC_FCB)
        return TRUE;

    return FALSE;
}

我把所有创建的文件都打出来了。 发现 丢失加密标志的文件 都没有打出来。怎么跳过去了。重要的是，文件还被加密了。55

诶呀，大家真厉害...
我做的毕业设计就是这个，还一点都不懂呢...
郁闷

NTSTATUS WdmReadCompletion(IN PDEVICE_OBJECT DebiceObject, IN PIRP Irp, IN PVOID Context)
{
    KEVENT* pEvent = (KEVENT*)Context;

    UNREFERENCED_PARAMETER(Irp);
    UNREFERENCED_PARAMETER(DebiceObject);
    KeSetEvent(pEvent, IO_NO_INCREMENT, FALSE);

    return STATUS_SUCCESS;
}

NTSTATUS WdmRead(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp)
{
    PIO_STACK_LOCATION IrpStack = IoGetCurrentIrpStackLocation(Irp);
    NTSTATUS status = STATUS_SUCCESS;
    KEVENT kEvent;
    int i=0;

    LONGLONG FilePointer = IrpStack->Parameters.Read.ByteOffset.QuadPart;
    LONG ReadLen = IrpStack->Parameters.Read.Length;
    KIRQL irql;
    PVOID OldBuffer = NULL;
    PSFILTER_DEVICE_EXTENSION DevExt = (PSFILTER_DEVICE_EXTENSION) DeviceObject->DeviceExtension;

    PAGED_CODE();
    DeviceObject = DeviceObject;
    KdPrint(("Read: %d bytes from file pointer %d.\r\n", (int)ReadLen, (int)FilePointer));

    if (!(Irp->Flags & (IRP_NOCACHE | IRP_PAGING_IO | IRP_SYNCHRONOUS_PAGING_IO)))
    {
        IoSkipCurrentIrpStackLocation(Irp);
        return IoCallDriver(DevExt->AttachedToDeviceObject, Irp);
    }

    do {
        if(FilePointer < 0)
        {
            status = STATUS_INVALID_PARAMETER;
            break;
        }
        else
        {
            if (Irp->MdlAddress)
                OldBuffer = MmGetSystemAddressForMdl(Irp->MdlAddress);
            else if(Irp->AssociatedIrp.SystemBuffer == NULL)
                OldBuffer = Irp->UserBuffer;
            else OldBuffer = Irp->AssociatedIrp.SystemBuffer;

            if(OldBuffer == NULL)
                break;

            KeClearEvent(&kEvent);
            IoSetCompletionRoutine(Irp, WdmReadCompletion, (PVOID)&kEvent, TRUE, TRUE, TRUE);
            status = IoCallDriver(DevExt->AttachedToDeviceObject, Irp);

            if(STATUS_PENDING == status)
            {
                status = KeWaitForSingleObject(&kEvent, Executive, KernelMode, FALSE, NULL);
                ASSERT(STATUS_SUCCESS == status);
            }
        
            KeAcquireSpinLock(&BufferLock, &irql);

            for(i = 0; i < ReadLen; i++)
                ((char*)OldBuffer) = ((char*)OldBuffer)-1;

            KeReleaseSpinLock(&BufferLock, irql);
            return IoCallDriver(DevExt->AttachedToDeviceObject, Irp);
        }        
    } while(0);

    Irp->IoStatus.Status = status;
    IoCompleteRequest(Irp, IO_NO_INCREMENT);
    return status;
}

NTSTATUS
SfWriteCompletion(
                 IN PDEVICE_OBJECT DeviceObject,
                 IN PIRP Irp,
                 IN PVOID Context
                 )
{
    PW_R_COMPLETION_STRUCT CompletionCtx = (PW_R_COMPLETION_STRUCT)Context;
    PVOID userBuffer = Irp->UserBuffer;

    DeviceObject = DeviceObject;

    Irp->MdlAddress = CompletionCtx->Mdl;
    Irp->UserBuffer = CompletionCtx->UserBuffer;
    Irp->AssociatedIrp.SystemBuffer = CompletionCtx->AssociatedBuffer;

    ExFreePoolWithTag(userBuffer, SFLT_POOL_TAG);
    ExFreePoolWithTag(CompletionCtx, SFLT_POOL_TAG);

    return STATUS_SUCCESS;
}

NTSTATUS WdmWrite(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp)
{
    PIO_STACK_LOCATION IrpStack = IoGetCurrentIrpStackLocation(Irp);
    NTSTATUS status = STATUS_SUCCESS;
    int i = 0;
    LONGLONG FilePointer = IrpStack->Parameters.Write.ByteOffset.QuadPart;
    LONG WriteLen = IrpStack->Parameters.Write.Length;
    KIRQL irql;
    PVOID OldBuffer = NULL;
    PVOID NewBuffer = NULL;
    PSFILTER_DEVICE_EXTENSION DevExt = (PSFILTER_DEVICE_EXTENSION) DeviceObject->DeviceExtension;
    PW_R_COMPLETION_STRUCT pCompletionCtx=NULL;

    PAGED_CODE();
    DeviceObject = DeviceObject;

    KdPrint(("Wirte: %d bytes from file pointer %d.\r\n", (int)WriteLen, (int)FilePointer));

    if (!(Irp->Flags & (IRP_NOCACHE | IRP_PAGING_IO | IRP_SYNCHRONOUS_PAGING_IO)))
    {
        IoSkipCurrentIrpStackLocation(Irp);
        return IoCallDriver(DevExt->AttachedToDeviceObject, Irp);
    }

    do
    {
        if(FilePointer < 0)
            status = STATUS_INVALID_PARAMETER;
        else
        {
            if (Irp->MdlAddress)
                OldBuffer = MmGetSystemAddressForMdl(Irp->MdlAddress);
            else if(Irp->AssociatedIrp.SystemBuffer == NULL)
                OldBuffer = Irp->UserBuffer;
            else OldBuffer = Irp->AssociatedIrp.SystemBuffer;

            if(OldBuffer == NULL)
                break;

            NewBuffer = ExAllocatePoolWithTag(NonPagedPool, WriteLen, SFLT_POOL_TAG);
            if(NULL == NewBuffer)
            {
                IoSkipCurrentIrpStackLocation(Irp);
                return IoCallDriver(DevExt->AttachedToDeviceObject, Irp);
            }

            pCompletionCtx = ExAllocatePoolWithTag(NonPagedPool, sizeof(W_R_COMPLETION_STRUCT), SFLT_POOL_TAG);
            if(NULL == NewBuffer)
            {
                ExFreePoolWithTag(NewBuffer, SFLT_POOL_TAG);
                IoSkipCurrentIrpStackLocation(Irp);
                return IoCallDriver(DevExt->AttachedToDeviceObject, Irp);
            }

            pCompletionCtx->Mdl = Irp->MdlAddress;
            pCompletionCtx->UserBuffer = Irp->UserBuffer;
            pCompletionCtx->AssociatedBuffer = Irp->AssociatedIrp.SystemBuffer;

            KeAcquireSpinLock(&BufferLock, &irql);

            memset(NewBuffer, 0, WriteLen);
            memcpy(NewBuffer, OldBuffer, WriteLen);
            for(i = 0; i < WriteLen; i++)
                ((char*)NewBuffer) = ((char*)NewBuffer)+1;

            if(NULL != Irp->MdlAddress)
                Irp->MdlAddress = NULL;
            if(NULL != Irp->AssociatedIrp.SystemBuffer)
                Irp->AssociatedIrp.SystemBuffer = NULL;

            Irp->UserBuffer = NewBuffer;

            KeReleaseSpinLock(&BufferLock, irql);

            IoCopyCurrentIrpStackLocationToNext(Irp);
            IoSetCompletionRoutine(Irp, SfWriteCompletion, pCompletionCtx, TRUE, TRUE,TRUE);
            return IoCallDriver(DevExt->AttachedToDeviceObject, Irp);
        }
    } while(0);

    Irp->IoStatus.Status = status;
    IoCompleteRequest(Irp, IO_NO_INCREMENT);

    return status;
}


上面的WdmWrite和WdmRead会蓝屏，为什么啊？

看看

不错，真的是吐血了

请问一下bluacat,您是如何判断您要加密的文件的？

恳请bluacat的回复

原理是这样,
实现方法很多种,
做到高效安全最费功夫.

汗 ～ 自己都弄错了

文件过滤驱动透明加解密学习之！

不太懂。。。

学习啦！