private key crypto on form post data

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From: ESPN Lover (espn_at_lover.com)
Date: 02/25/05 

Date: Fri, 25 Feb 2005 08:08:59 -0700

Hello,

I need to find a way to encode a form post element with a private key, which
then can be decoded using that same private key using ASP. Yeah, Yeah, I
know strange request. Is there some object on my IIS 6 server or some
object in the Win2000 OS that would allow me to pass in data and a key and
get back the encoded data as well as being able to pass in the encoded data
with the key and get back decoded data?

Would prefer to use a syntax like
  DIM myData, X
  myData = ...some routine to get data...
  SET X = Server.CreateObject("COMPONENT.CLASS")
  DIM enc
  enc = X.Encode(myData, myKey)
  SET X = Nothing
  Response.Write "<INPUT Type=Hidden Name=EncodedStuff Value=" & enc & ">"

Then on form receipt
  DIM myEncData, enc
  myEncData= Request.Form("EncodedStuff")
  SET X = Server.CreateObject("COMPONENT.CLASS")
  DIM decoded
  decoded= X.Decode(myEncData, myKey)
  SET X = Nothing
  do stuff with decoded data....

Thank you!

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