Imports github.com/ComputerScienceHouse/gatekeeper/keys github.com/ComputerScienceHouse/gatekeeper/sig github.com/fuzxxl/freefare/0.3/freefare github.com/fuzxxl/nfc/2.0/nfc github.com/google/uuid github.com/labstack/gommon/log Standard library imports crypto/ecdsa errors io/ioutil math/big strings time