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iCLASS encryption implementation #4

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iCLASS encryption implementation #4

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85c5db9
initial testing of iclass crypto
steve-embling Feb 22, 2019
41ea704
added hooks
steve-embling Feb 22, 2019
64f6124
uppercase for consistency
steve-embling Feb 22, 2019
4b76290
Removed unecessary import
steve-embling Feb 22, 2019
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16 changes: 14 additions & 2 deletions lrr_wiegand_listener.py
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,10 @@
#############################################################################

import pigpio
from Crypto.Cipher import DES3
from binascii import hexlify

iclass_key = "00000000000000000000000000000000"

# The magic code to decode wiegand data from the wiegand data lines. Borrowed from http://abyz.co.uk/rpi/pigpio/examples.html
class decoder:
Expand Down Expand Up @@ -123,6 +127,14 @@ def validateCSV(file):
if not (id_num.isdigit()):
id_num = 0

def encryptIClass(wiegand_hex):
if iclass_key == "00000000000000000000000000000000":
return "FFFFFFFFFFFFFFFF".upper()
else:
key = iclass_key.decode("hex")
cipher = DES3.new(key, DES3.MODE_ECB)
plaintext = wiegand_hex.decode("hex")
return hexlify(cipher.encrypt(plaintext)).upper()

# Add scanned cards to CSV file
def addCardsToCSV(bits, wiegand_binary, wiegand_hex, enc_hex, fac_code, card_num, card_num_no_fac):
Expand Down Expand Up @@ -170,7 +182,7 @@ def callback(bits, value):
fac_code, card_num, card_num_no_fac, hidHeader = decodeWiegandData(bits, wiegand_binary)
wiegand_binary = hidHeader + wiegand_binary
wiegand_hex = "%016X" % int(wiegand_binary, 2)
enc_hex = "FFFFFFFFFFFFFFFF".upper() # To Implement
enc_hex = encryptIClass(wiegand_hex)
addCardsToCSV(bits, wiegand_binary, wiegand_hex, enc_hex, fac_code, card_num, card_num_no_fac)

# Debug output to console
Expand All @@ -195,4 +207,4 @@ def callback(bits, value):
raw_input()
w.cancel()
pi.stop()