API docs and the README are available at http://www.stackage.org/package/authenticate.
Authentication methods for Haskell web applications. Note for Rpxnow: By default on some (all?) installs wget does not come with root certificates for SSL. If this is the case then Web.Authenticate.Rpxnow.authenticate will fail as wget cannot establish a secure connection to rpxnow's servers. A simple *nix solution, if potentially insecure (man in the middle attacks as you are downloading the certs) is to grab a copy of the certs extracted from those that come with firefox, hosted by CURL at http://curl.haxx.se/ca/cacert.pem , put them somewhere (for ex, ~/.wget/cacert.pem) and then edit your ~/.wgetrc to include: ca_certificate=~/.wget/cacert.pem This should fix the problem.