mirror of
https://github.com/RfidResearchGroup/proxmark3.git
synced 2024-11-11 18:33:18 +08:00
51 lines
1.6 KiB
Python
Executable file
51 lines
1.6 KiB
Python
Executable file
# xorcheck.py - find xor values for 8-bit LRC
|
|
#
|
|
# Adam Laurie <adam@algroup.co.uk>
|
|
# http://rfidiot.org/
|
|
#
|
|
# This code is copyright (c) Adam Laurie, 2009, All rights reserved.
|
|
# For non-commercial use only, the following terms apply - for all other
|
|
# uses, please contact the author:
|
|
#
|
|
# This code is free software; you can redistribute it and/or modify
|
|
# it under the terms of the GNU General Public License as published by
|
|
# the Free Software Foundation; either version 2 of the License, or
|
|
# (at your option) any later version.
|
|
#
|
|
# This code is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU General Public License for more details.
|
|
#
|
|
# 2020, Modified (@iceman1001)
|
|
|
|
import sys
|
|
|
|
def main():
|
|
if(len(sys.argv) < 3):
|
|
print("""
|
|
\t{0} - Generate final byte for XOR LRC
|
|
|
|
Usage: {0} <ID Byte1> <ID Byte2> ... <LRC>
|
|
|
|
\tSpecifying the bytes of a UID with a known LRC will find the last byte value
|
|
\tneeded to generate that LRC with a rolling XOR. All bytes should be specified in HEX.
|
|
|
|
Example:
|
|
|
|
\t{0} 04 00 80 64 ba
|
|
|
|
Should produce the output:
|
|
|
|
\tTarget (BA) requires final LRC XOR byte value: 5A\n""".format(sys.argv[0]))
|
|
return 1
|
|
|
|
target= int(sys.argv[len(sys.argv) - 1],16)
|
|
|
|
lrc= 0x00
|
|
for i in range(len(sys.argv) - 1):
|
|
lrc ^= int(sys.argv[i + 1],16)
|
|
print('\nTarget (%02X) requires final LRC XOR byte value: %02X\n' % (target,lrc))
|
|
|
|
if __name__ == "__main__":
|
|
sys.exit(main())
|