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https://github.com/RfidResearchGroup/proxmark3.git
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102 lines
3 KiB
Python
Executable file
102 lines
3 KiB
Python
Executable file
#!/usr/bin/python
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# findbits.py - find Binary, Octal, Decimal or Hex number in bitstream
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#
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# Adam Laurie <adam@algroup.co.uk>
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# http://rfidiot.org/
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#
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# This code is copyright (c) Adam Laurie, 2009, All rights reserved.
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# For non-commercial use only, the following terms apply - for all other
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# uses, please contact the author:
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#
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# This code is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This code is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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import sys
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import os
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# invert binary string
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def invert(data):
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return ''.join('0' if c == '1' else '1' for c in data)
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# do the actual search
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def search(target,data):
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location = data.find(target)
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if location >= 0:
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print '*** Match at bit %d:' % location,
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print '%s<%s>%s' % (data[:location],target,data[location+len(target):])
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else:
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print 'Not found'
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# convert integer to binary string
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def binstring(number):
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return bin(number)[2:] if number > 0 else ''
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# reverse string order
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def stringreverse(data):
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return data[::-1]
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# match forward, backward and inverted
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def domatch(binary,number):
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reversed= stringreverse(number)
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inverted= invert(binary)
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print ' Forward: (%s)' % number,
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search(binary,number)
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print ' Reverse: (%s)' % reversed,
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search(binary,reversed)
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print ' Inverse: (%s)' % inverted
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print ' Forward: (%s)' % number,
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search(inverted,number)
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print ' Reverse: (%s)' % reversed,
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search(inverted,reversed)
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def main():
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if(len(sys.argv) < 3):
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print
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print '\t'+sys.argv[0] + ' - Search bitstream for a known number'
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print
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print 'Usage: ' + sys.argv[0] + ' <NUMBER> <BITSTREAM>'
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print
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print '\tNUMBER will be converted to it\'s BINARY equivalent for all valid'
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print '\tinstances of BINARY, OCTAL, DECIMAL and HEX, and the bitstream'
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print '\tand it\'s inverse will be searched for a pattern match. Note that'
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print '\tNUMBER must be specified in BINARY to match leading zeros.'
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print
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print 'Example:'
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print
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print '\tfindbits.py 73 0110010101110011'
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print
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os._exit(True)
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bases= {
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2:'BINARY',
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8:'OCTAL',
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10:'DECIMAL',
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16:'HEX',
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}
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for base, base_name in sorted(bases.iteritems()):
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try:
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number= int(sys.argv[1],base)
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print
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print 'Trying', base_name
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# do BINARY as specified to preserve leading zeros
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if base == 2:
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domatch(sys.argv[1],sys.argv[2])
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else:
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domatch(binstring(number),sys.argv[2])
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except:
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continue
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if __name__ == '__main__':
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main()
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