!/usr/bin/env python
import hashlib
import pyudev

if __name__ == "__main__":
    retval = None
    context = pyudev.Context()
    borrajaxHardwareKey = unicode()
    for netDevice in context.list_devices(subsystem="net"):
        actualDevice = netDevice.parent
        if actualDevice is not None:
            tmpList = list()
            try:
                tmpList.append(actualDevice.attributes.asstring("vendor"))
                tmpList.append(actualDevice.attributes.asstring("device"))
            except KeyError:
                tmpList = list()
            if len(tmpList) > 0:
                borrajaxHardwareKey = u"," + borrajaxHardwareKey + u":".join(tmpList)

    dmiThingy = pyudev.Device.from_path(context, '/sys/devices/virtual/dmi/id')
    dmiThingyValidAttrs = list()
    for dmiThingAttr in ["bios_vendor", "sys_vendor", "product_name", "board_vendor", "board_name"]:
        try:
            dmiThingyVal = dmiThingy.attributes.asstring(dmiThingAttr).strip()
            if len(dmiThingyVal) == 0:
                raise KeyError()
            else:
                dmiThingyValidAttrs.append(dmiThingyVal)
        except KeyError:
            pass

    borrajaxHardwareKey = u"," + borrajaxHardwareKey + u":".join(dmiThingyValidAttrs)
    print "1) Before hashing (do not use this one):\n\'%s\'" % borrajaxHardwareKey
    borrajaxHardwareKey = hashlib.sha256(borrajaxHardwareKey).hexdigest()
    print "2) After hashing:\n%s" % borrajaxHardwareKey