I would like to implement a signature for my web posts like this for example. Now I have the client code working nicely in objective-c, but I have to admit I am not sure how to pull out the parameters on the web side. I imagine I would start with unencrypting the string, but to get the params out I only have some basic ideas. Does anyone have any links or recommendations on how to properly handle signatures like this on the web side. To give you an idea this is what I am doing on the client side:
-sorting the parameters by name (including an API key and timestamp) -encrypting using HMAC-sha1
I know I can think of a way to do it, but I figure this wheel has definitely been built (and better than I could do).