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RFID Tinkering: Proxmark Python API |
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Présentation : Yesterday, I set out to create a Python API for my Proxmark. The toughest part was selecting the right USB module. My gut reaction said "PyUSB", but was rightly corrected by Didier that python-hid would be a better fit since the Proxmark exports a HID interface. The suggestion was sound logic, however, what appear to be implementation flaws in libhid (upon which python-hid relies) prevented me from using it with the Proxmark. For some reason, libhid was unable to retrieve the Proxmark's device descriptor and this would cause hid_force_open() to fail. Google revealed that other folks have had the same problem. After pulling out my hair with python-hid, I went back to my original candidate and things just started working. The first operation I implemented for test purposes was the tune command. root@stumpi:~/python-proxmark# cat tune.py #! /usr/bin/env python # Copyright 2009, Rysc Corp. from proxmark import * if __name__ == '__main__': pm3 = Proxmark() antennas = pm3.tune() for ant in antennas: print ant The code above invokes the Proxmark API to display the voltage and impedance measured on each antenna. Sample output shown below: 125kHz v=123mV z=1273 ohms 134kHz v=0mV z=1273 ohms 13.56MHz v=99mV z=90 ohms Another snippet designed to mimic the loread command is shown below. pm3 = Proxmark() samples = pm3.lf_read_125khz() print samples Which results in the list: [-89, -128, -49, 109, 127, 107, 26, -42, ... , -22, -81] I'm still not 100% confident in the routine that downloads samples from the proxmark, it was ported from the C client. In the next few weeks, I'll be working to test ported commands and add decoding (ASK, FSK etc) routines in a separate Python module. For experimentation purposes, developing new routines in firmware is slow, which is where I hope Python will help. It is a much simpler exercise implementing a HID tag decoder in Python versus in C with an ARM as your target. I also hope that having a base API in python will usher in a nicer user interface... PyGTK anyone? We'll see.[]
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