How to generate CMS PKCS file signature on Ruby on Rails?

Question

OpenSSL

Good afternoon, please tell me how to sign files, XML in Ruby on Rails Openssl

def create
    @company = Company.find(params[:company_id])
    @message = @company.messages.build(mess_params)
    @message.uploads.select { |item|
      item.sign_file = signFile(Paperclip.io_adapters.for(item.uploaded_file).read, request.session_options[:id].to_s)
      }
   @message.save
  end

def signFile(data, id_session)
      value = nil
      keyname = 'keyp12'+id_session
      p12 = OpenSSL::PKCS12.new( Rails.cache.fetch(keyname).p12_file)
      value = OpenSSL::PKCS7::sign(p12.certificate, p12.key, data, [], OpenSSL::PKCS7::DETACHED)
    end
    return value.to_pem
  end

returns a certificate, I don’t understand what to do with it, how to make a CMS or PKCS # 7 signature?
certificate revocation checks go through other actions
Legally valid signature and OCSP timestamp required