using CryptUnprotectData api from c#

[ziggy]

Hi,

i'm trying to use function from crypt32.dll in dot net, and get exception:

An unhandled exception of type 'System.TypeLoadException' occurred in
WindowsApplication1.exe

Additional information: Could not load type WinApis from assembly
WindowsApplication1, Version=1.0.2006.19524, Culture=neutral,
PublicKeyToken=null because the method CryptUnprotectData has no RVA.


can anyone shade some light on the subject?

TIA, z.

 

[Dominick Baier [DevelopMentor]]

Hello ziggy,

i have a wrapper for that up on my blog:
http://www.leastprivilege.com/PermaLink.aspx?guid=ebd9956e-a36c-4b57-8d58-6ff79a60e43f

maybe that helps to track down the problem

 

[ziggy]

well, i just get a message "exception decrypt"
i'll try to further investigate this.
thahks.

 

[BRG]

If you haven't read it already, I recommend this article which provides
sample code for using CryptUnprotectData from C#:

How To: Create a DPAPI Library
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnnetsec/html/SecNetHT07.asp