How to add extra bytes by a filter driver ?

I’m developing an encryption/decryption filter driver using block
ciphering algorithm for Win2K. Since padding is required, extra-bytes is
required to append to the end of the encrypting file. I found Win2K has a
mechanism in checking/ensuring the data consistency that prevent me from
adding the extra-bytes. I do not know how to “cheat” the OS for adding
extra-bytes.

Is it possible to do what I mentioned by a filter driver ? If it is
possible, then what are the correct steps in doing that ?

Thanks & Regards,

– Philip

Philips,

If I recall correctly, there is a KB article on this, but I’m not sure.
Probably the best thing to do is to use NTFS file streams for your
specific encryption data. However, this is not supported on FAT/FAT32…

Bartjan.

-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com] On Behalf Of Philip Hong
Sent: donderdag 21 maart 2002 10:24
To: File Systems Developers
Subject: [ntfsd] How to add extra bytes by a filter driver ?

I’m developing an encryption/decryption filter driver using block
ciphering algorithm for Win2K. Since padding is required, extra-bytes is
required to append to the end of the encrypting file. I found Win2K has
a mechanism in checking/ensuring the data consistency that prevent me
from adding the extra-bytes. I do not know how to “cheat” the OS for
adding extra-bytes.

Is it possible to do what I mentioned by a filter driver ? If it is
possible, then what are the correct steps in doing that ?

Thanks & Regards,

– Philip


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