# File lib/fog/cloudstack.rb, line 19
    def self.signed_params(key,params)
      query = params.map{|k,v| [k.to_s, v]}.sort.collect{|c| "#{c[0]}=#{escape(c[1].to_s)}"}.join('&').downcase

      signed_string = Base64.encode64(OpenSSL::HMAC.digest(@@digest,key,query)).strip

      signed_string
    end