title: What's a simple way to encrypt and decrypt strings with a user-supplied password that works in both native Win32 and .NET?
body: <p>I have a native Win32 client application, and a .NET web application.  I'd like to be able to encrypt a string on the client (given a user supplied password), and to be able to decrypt this string on the server given the same password.  My client application is 32-bit, and my .NET web application is 64-bit.  On the client, I'm not able to deploy the .NET framework.</p>
  
  <p>I need a simple and robust solution.  By simple, I mean I'd prefer a single function call.  By robust, I mean I'd like an industry standard encryption algorithm like AES, and I don't want memory leaks.</p>
  
  <p>Any suggestions on how I can accomplish this in a simple and robust way?</p>
  
  <p>(Perhaps a DLL that comes in both a 32-bit and a 64-bit version?  My .NET web application could P/Invoke to it, and my native application could just use it.)</p>