request_token_base_string = 'POST&' + CGI.escape("#{Pazienti2::Application::BLOG_URL}oauth1/request?" + request_token_url.query)

hmac = OpenSSL::HMAC.digest(OpenSSL::Digest::Digest.new('sha1'), params[:oauth_consumer_secret].encode("ASCII") + '&' + '', request_token_base_string.encode("ASCII"))
signature = Base64.encode64(hmac).chomp
request_token_params[:oauth_signature] = signature