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CrySIL U2F on Android

This project implements a CrySIL server compatible to U2F commands on Android. The app can be installed on any Android device running Android 4.0 or later. Any cryptographic commands are execute on a smart card connected over NFC or using the Android KeyStore. CrySIL/U2F clients connect to a webservice which forwards the request to the registered CrySIL server. See the documentation of the webservice, the instance and of the Android app for details.

Process to start from scratch:

  • Install the CrySIL server on an Android device
  • The device needs Google Play Services installed to use Google Cloud Messaging
  • Make sure the webservice is running and accessible
  • Within the app, register the CrySIL server on the webservice
  • Webservice will assign a CrySIL ID to the server
  • CrySIL client sends a request to the webservice, specifying the server ID
  • Webservice sends a push notification to the CrySIL server (with Google Cloud Messaging)
  • CrySIL server app receives the notification and establishes a secure WebSocket connection to the webservice
  • Webservice forwards the request from the CrySIL client to the Android device
  • Requests and responses are handled over this channel
  • WebSocket connection from the Android device to the webservice will stay open for further requests