I doubt if this is encryption but I can't find a better phrase. I need to pass a long query string like this:

http://test.com/test.php?key=[some_very_loooooooooooooooooooooooong_query_string]

The query string contains NO sensitive information so I'm not really concerned about security in this case. It's just...well, too long and ugly. Is there a library function that can let me encode/encrypt/compress the query string into something similar to the result of a md5() (similar as in, always a 32 character string), but decode/decrypt/decompress-able?