Implement command 0x41 which is used by OpenSSH for reading RKs. It has
the following subcommands:
* CMD_CRED_METADATA - get number of saved/remaining RKs
* CMD_RP_BEGIN/CMD_RP_NEXT - iterate over the saved RPs
* CMD_RK_BEGIN/CMD_RK_NEXT - iterate over the RKs for a given RP
Fixes issue #374 and issue #314
There is a HID gadget driver on Linux which provides emulation of USB
HID devices. This could be very useful for testing the Solo firmware
without actual hardware, using only a Linux box.
This patch adds a command line argument which specifies whether the
existing UDP backing should be used or the new one which reads and
writes to /dev/hidg0.
Testing done:
1. Created HID device with configfs
2. Started "./main -b hidg" as root
3. Successfully executed Webauthn registration and authentication on
the same Linux machine
Closes: #122
Radoslav Gerganov