hash suggestions wanted

the PHP crypt function uses DES and it only generates a hash based on the first 8 chars of a string, although it produces a 12-char hash. Md5 can hash a string of indefinite length, but it produces a much longer hash (34 chars or so). I need something that can provide me with a 12-16 char hash of an indefinite string (usually under 100 chars in my case) using standard hasing algorithms. Any suggestions? Thanks -David Schwartz