sign-message-with-keycard.sh

./keycard shell <<END
  # select the keycard applet
  keycard-select
  # set the secrets we had from the initialisation
  keycard-set-secrets 123456 123456789012 KeycardTest
  # pairing is usually done once per device
  keycard-pair
  keycard-open-secure-channel
  keycard-verify-pin {{ session_pin }}
  # derive the key we want to use
  keycard-derive-key m/44'/60'/0'/0/0
  # sign a message. a prefix is added like in web3.eth.sign  
  keycard-sign-message Hello World
  # we unpair the current device so that we don't use one of the 5 available slots.
  keycard-unpair {{ session_pairing_index }}
END