Symmetric Hashing With .NET Crypto Service Providers and COM Interop

I wrote the DotNetCryptoCOM (DNCC) library because I  wanted to be able to generate and reverse cypher text between .NET and COM applications using a single .dll.  It allows developers to drive the builtin .NET Cryptographic Service Providers with a simple API.  I’ve used this lib in VB, Managed C++, and of course C# applications.  Some of you may find it useful as well.

 

A few notes of interest:

 

1.  If you plan to use it from COM apps, you’ll need to do the following from a cmd shell:

(hint, use a Visual Studio Shell to have the path var in your env setup properly)

     copy DotNetCryptoCOM.dll  %windir%\system32

     cd %windir%\system32

     regasm %windir%\system32\DotNetCryptoCOM.dll /tlb:DotNetCryptoCOM.tlb

     gacutil /i DotNetCryptoCOM.dll

2.  If you plan to use it in Classic ASP apps, you’ll also need to remember to configure IIS to support ASP pages and from a cmd shell type:

     iisreset.

Now, I present a brief sample that shows how to use DNCC. 

First, I’ll encrypt some text in VBScript with it:

——————————————————————–

‘ Set raw text

Dim

strRawData

strRawData =

"super secret message"