dev-avrkrypt.c is released under the LGPL.
aes.c and aes.h are verbatim copies from https://github.com/kokke/tiny-AES128-C,
which are in public domain.
We add a virtual usb avr aes128 encryption device against qemu v1.5.3 with the x86_64 target.
git clone git@github.com:suxue/qemu-usb-avrk.git
cd qemu-usb-avrk/
git submodule update --init
wget http://wiki.qemu-project.org/download/qemu-1.5.3.tar.bz2
tar xvf qemu-1.5.3.tar.bz2
cd qemu-1.5.3/
wget https://github.com/suxue/qemu-usb-avrk/compare/suxue:v1.5.3...usb-avrk.diff -O - | patch -Np1
http://www.linuxfromscratch.org/blfs/downloads/7.4/BLFS-BOOK-7.4-nochunks.html#qemu
People do not have enough time to build their own qemu image may want to try mine, which includes all auxiliary scripts and a small (20Mb, with glibc-2.20, libusb, pciutils, usbutils...) rootfs image.
git clone https://gist.github.com/dade5b978b276e290512.git image/
cd image/
./spawn.sh # this will spawn a screen session (virtual console and qemu monitor), or
./boot.sh SERIAL=stdio # the console of qemu will be connected to stdio
./ssh.sh 'zcat /proc/config.gz' > config # download the kernel configuration
We make use of the qemu qdev model, so multiple devices can be added and removed on the fly.
to activate the usb-avrk device, append these command line arguments to
qemu:
-usb
-device usb-avrk,id=usb-avrk0,filename=avrk0
-device usb-avrk,id=usb-avrk1,filename=avrk1
Then two files(avrk0 and avrk1) will be created in local directory
which represent the states of these 2 devices, you may use
watch 'xxd avrk0'
to inspect their contents. The first 16 bytes are the keys, then the input
buffer, then output buffer, then 1 byte for led status, then 1 byte for led
flashing status. You can also refer to the definition of AvrkDeviceState
in hw/usb/dev-avrkrypt.c.
Moreover, in the qemu telnet monitor, you can hotplug these devices.
- remove the 2nd device:
device_del usb-avrk1. - reconnect the 2nd device:
device_add usb-avrk,id=usb-avrk1,filename=avrk1.
The echo request is not implemented yet.