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VB Forum / Win API / November 2007Difficult one: decrypt files with win api
Hi All, I want to know if there is a way to decrypt files that have been given a encryption in windows, using a winapi in VB. If you have a file in windows and right click properties you can set under advanced the protection (encryption). That way only a pc with the right certificate can read the file. But now I want to remove the encryption from the file under VB. The certificate is on the computer where i run the VB program. Marco > Hi All, > [quoted text clipped - 8 lines] > > Marco Yes, well usually. But first, Encryption routines are not technically part of the "WinApi", one needs to determine what encryption library is in use. This can likely be determined by your O/S and what you have installed. Also you might consider just using the shell. What is the OS? -ralph > > Hi All, > [quoted text clipped - 18 lines] > > -ralph Ralph, We don't fancy the Shell. We are using Win NT. Marco > > > Hi All, > > [quoted text clipped - 23 lines] > We don't fancy the Shell. > We are using Win NT. Whoa! Too old for me. All my links are broken. <g> IIRC, you need to research the "CryptoAPI". I have never seen anything written in VB, it was always accessed using C. But it should be easy enough to create a wrapper. Someone else will be along shortly. -ralph > IIRC, you need to research the "CryptoAPI". I have never seen anything > written in VB, it was always accessed using C. That's capicom.dll, which is downloadable and redistributable. I started looking into it awhile back for some reason but then never ended up using it. I imagine there's a version for NT4 (if that's what was meant by "NT"), but the link I found for v. 2.1.0.2 doesn't list NT4 as supported. http://www.microsoft.com/downloads/details.aspx?FamilyId=860EE43A-A843-462F- ABB5-FF88EA5896F6 You may have to look for an older version download of an older version that supports NT4. Or it may be possible to just unpack the download MSI file and register capicom.dll on NT4. There are VB samples in this: "Wiley CryptoAPI COM Objects" Try a search for the above title or "wcco". The download zip I have is wcco10.zip There are also limited samples in the MS download. I don't know whether capicom is actually what you want, but it's probably worth checking into. I tried to get a general list of supported functions in the DLL but the reference link was broken on the above page. (I sometimes almost wonder whether MS is going out of business. Their whole website is a mess and I seem to find nothing but broken links lately.) According to the docs, EncryptFile is in the kernel and starts with Win2000, so I guess the OP doesn't want that. Have a look at the DecryptFile API function. Timo  Signaturewww.TimoSoft-Software.de - Unicode controls for VB6 "Those who sacrifice freedom for safety deserve neither." > Have a look at the DecryptFile API function. > > Timo > --www.TimoSoft-Software.de- Unicode controls for VB6 > "Those who sacrifice freedom for safety deserve neither." Timo, Had a look around, there ain't much out there. Do you have an example on this API? Marco vonClausowitz schrieb: > Had a look around, there ain't much out there. > Do you have an example on this API? It's straight forward: LPTSTR pPath = _T("C:\\MyFile.txt"); BOOL succeeded = DecryptFile(pPath, 0); Timo Signaturewww.TimoSoft-Software.de - Unicode controls for VB6 "Those who sacrifice freedom for safety deserve neither." |
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