Re: Encryption/Decryption
From: Don Dumitru [MSFT] (dondu_at_online.microsoft.com)
Date: 08/30/04
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Date: Mon, 30 Aug 2004 14:02:22 -0700
For encrypting / decrypting multiple files at once, I assume that you would
need to change the programs. If your design goal really is to process *all*
of the files in the folder, then you would use FindFirstFile / FindNextFile
to iterate through the files. On the other hand, your design goal might be
to process the list of files which are named on the command line of the
program, in which case the program would examine its command line arguments,
and apply the encrption / decryption to each of the filenames passed on the
command line.
--Don
-- This posting is provided "AS IS" with no warranties, and confers no rights. "Arvind" <arvinds@erivasystems.com> wrote in message news:%23F1Vw5ljEHA.1048@tk2msftngp13.phx.gbl... > your right! > > Now the problem is fixed and its working fine.. > > now i have 2 applications (desktop/pda) > > and one more thing..can i do the encryption of list of files present in > the > folder > > like > > test.abc > test1.abc > etc > > to > > encrypt serially one by one? > > and same for decrypting one by one automatically > > how can we do that? > > -- > > Thanks, > > Arvind > > -- > "eRiva Systems" - Where Technology Meets Life, Every Minute. > > arvindr@erivasystems.com > > www.erivasystems.com > > "Don Dumitru [MSFT]" <dondu@online.microsoft.com> wrote in message > news:OaZxk9LhEHA.596@TK2MSFTNGP11.phx.gbl... >> From the thread going on in the microsoft.public.windowsce.embedded.vc >> newsgroup, I am going to assume that this is getting resolved as an issue > of >> using an ANSI pass-phrase on the desktop, and a Unicode pass-phrase on >> the >> device. >> >> --Don >> >> -- >> This posting is provided "AS IS" with no warranties, and confers no > rights. >> >> >> "Don Dumitru [MSFT]" <dondu@online.microsoft.com> wrote in message >> news:OPB1KmLhEHA.904@TK2MSFTNGP09.phx.gbl... >> > Can you provide the full URL for the sample, so I can be sure that we > are >> > looking at exactly the same thing? Without it, I don't know which > actual >> > sample you might be looking at, and I can only guess at what problems > you >> > are having, and I won'd be able to reliably reproduce the behavior > myself. >> > >> > From your description, it sounds like the sample works by generating an >> > RC4 key into a key container for the user, and then encrypting / >> > decrypting the file using that key. I am guessing here, but... You >> > run >> > an "init user" app on both the sender and the receiver, and give it the >> > same pass-phrase? And it generates an RC4 key and places it in the > user's >> > key container? You then run an encryption program, which uses the > stored >> > key to encrypt a file. You move the file to the other machine, and run >> > the decryption program, which accesses the stored key and decrypts the >> > file. >> > >> > That's what it sounded like it was doing. >> > >> > The first thing to verify would be that you can decrypt the file >> > successfully, on the desktop, without Windows CE involved. The next > thing >> > to do is to build the "init user" app for Windows CE, and run it, and > see >> > if it succeeds. Ideally, you would single-step through with a >> > debugger, >> > and examine each error return, in case the application itself does not >> > adequately report some error that it receives. Finally, you need to > build >> > the decryption program for Windows CE, run it, and again hopefully >> > single-step through it to examine error codes which might be getting >> > returned from various API's. >> > >> > From your description of how the app's are supposed to work, I would > look >> > closely at how the "init user" and decryption programs access the RC4 > key >> > stored in the key container. Since Windows CE has a different user > model >> > than the desktop, and since key containers are associated with users, > this >> > is an area where the app could be getting different behavior than it >> > was >> > expecting. The most likely case is that some error is being returned, > and >> > the app simply isn't checking the error code, and blindly cruising >> > along >> > as if the API had succeeded. >> > >> > --Don >> > >> > >> > "Arvind" <arvinds@erivasystems.com> wrote in message >> > news:%23yBu2MBhEHA.3964@TK2MSFTNGP12.phx.gbl... >> >>i got it from www.msdn.com >> >> >> >> basically theres 2 applications.. >> >> >> >> desktop for encrypting >> >> >> >> pocket pc for decrypting.. >> >> >> >> ive used RC4 to encrypt and using the same to decrypt.. >> >> but im getting the wrong output file. >> >> >> >> i have used the inituser for client for storing and generating >> >> keys(Container) >> >> >> >> but i couldnt find the same init user application for pocket pc >> >> >> >> can i get one? >> >> >> >> -- >> >> Thanks, >> >> >> >> Arvind >> >> >> >> >> >> -- >> >> "eRiva Systems" - Where Technology Meets Life, Every Minute. >> >> >> >> arvindr@erivasystems.com >> >> >> >> www.erivasystems.com >> >> >> >> "Don Dumitru [MSFT]" <dondu@online.microsoft.com> wrote in message >> >> news:#5ujxoYgEHA.1356@TK2MSFTNGP09.phx.gbl... >> >>> Can you provide a URL for the sample which you used? Was it a > specific >> >>> Windows CE sample, or a more general Win32 sample? Presumably, some >> >>> function call is failing, and the sample isn't reporting the failure. >> >>> >> >>> --Don >> >>> >> >>> -- >> >>> This posting is provided "AS IS" with no warranties, and confers no >> >> rights. >> >>> >> >>> >> >>> "Arvind" <arvinds@erivasystems.com> wrote in message >> >>> news:u1BRZURgEHA.2764@TK2MSFTNGP11.phx.gbl... >> >>> > Hello, >> >>> > >> >>> > im trying to use crypto API's in pocket pc (EVC++) >> >>> > >> >>> > to encrypt the WMV Files and decrypt the same. >> >>> > >> >>> > what i did is just copied the sample application which is provided > in >> >> the >> >>> > help and tried to run in the pocket pc >> >>> > >> >>> > the application for encryption creates the destination file but the >> >>> > content >> >>> > are not added in that.. >> >>> > (File shows 0 BYTES) >> >>> > >> >>> > is there any other way around i have to try? >> >>> > >> >>> > plese let me know ur ideas.. >> >>> > >> >>> > -- >> >>> > "eRiva Systems" - Where Technology Meets Life, Every Minute. >> >>> > >> >>> > arvindr@erivasystems.com >> >>> > >> >>> > www.erivasystems.com >> >>> > >> >>> > >> >>> >> >>> >> >> >> >> >> > >> > >> >> > >
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