mirror of
https://github.com/Proxmark/proxmark3.git
synced 2024-11-15 13:14:27 +08:00
52 lines
1.6 KiB
Python
Executable file
52 lines
1.6 KiB
Python
Executable file
#!/usr/bin/python
|
|
|
|
# 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.
|
|
#
|
|
|
|
import sys
|
|
import os
|
|
|
|
if(len(sys.argv) < 3):
|
|
print
|
|
print '\t'+sys.argv[0] + ' - Generate final byte for XOR LRC'
|
|
print
|
|
print 'Usage: ' + sys.argv[0] + ' <ID Byte1> <ID Byte2> ... <LRC>'
|
|
print
|
|
print '\tSpecifying the bytes of a UID with a known LRC will find the last byte value'
|
|
print '\tneeded to generate that LRC with a rolling XOR. All bytes should be specified in HEX.'
|
|
print
|
|
print 'Example:'
|
|
print
|
|
print '\txorcheck.py 04 00 80 64 ba'
|
|
print
|
|
print 'Should produce the output:'
|
|
print
|
|
print '\tTarget (BA) requires final LRC XOR byte value: 5A'
|
|
print
|
|
os._exit(True)
|
|
|
|
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
|
|
print 'Target (%02X) requires final LRC XOR byte value: %02X' % (target,lrc)
|
|
print
|