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FIDO2 JavaCard applet and toolkit

• FIDO2/CTAP2 utility "fido2" for command line authenticator introspection
  • easy to use, UNIX style, like GlobalPlatformPro
  • supports FIDO_2_0 and FIDO_2_1_PRE devices (like Yubikeys and X-FIDO applet)
• FIDO2/CTAP2 Java library
  • support for NFC (PC/SC) and HID (USB) transports
  • flexible CTAP2 command creation and wire protocol debugging helpers
  • like libfido2, but in Java 1.8+ :)
  • supports working with X-FIDO management commands
• U2F/FIDO2 JavaCard applet with secp256r1 keys support
  • usable with any NFC phone (iPhone, Android)
  • X-FIDO (ExtendedFIDO) features
  • WIP: HID interface support on a USB JavaCard token from <undisclosed vendor>