Warden - how to setup custom encryptor

rubyonrails-talk
1

I`m writting sinatra app and i would like to setup encryption in Warden like i did it in devise when i used Rails.

  module Devise     module Encryptors       class Md5 < Base         def self.digest(password, stretches, salt, pepper)           str = [password].flatten.compact.join           Digest::MD5.hexdigest(Digest::MD5.hexdigest(str))         end       end     end   end

Where I can setup this module ?? How to set Warden to use MD5 encryption?