json_to_nfc

.py

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University of Washington *

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548

Subject

Computer Science

Date

Feb 20, 2024

Type

py

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1

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# Script to convert proxmark JSON output to Flipper Mifare Classic NFC File Format import json import argparse def add_spaces_to_hex(in_str): # converts something like "AB00BA" to "AB 00 BA" out_str = "" for i in range(0, len(in_str), 2): out_str += in_str[i:i+2] + " " return out_str.strip() def guess_mifare_size_by_sak(SAK): if SAK == "18": return "4K" elif SAK == "08": return "1K" else: return "idk" parser = argparse.ArgumentParser(description='Convert proxmark JSON output to Flipper Mifare classic NFC File Format') parser.add_argument('-i', '--input', help='Input file', required=True) parser.add_argument('-o', '--output', help='Output file', required=True) parser.add_argument('-v', '--verbose', help='Verbose output', action='store_true') parser.add_argument('-k', '--keys-only', help='Only output keys', action='store_true') args = parser.parse_args() with open(args.input, 'r') as f: data = json.load(f) if args.keys_only: # just output the keys to a file with open(args.output, 'w') as f: for sector in data['SectorKeys']: f.write(data) else: with open(args.output, 'w') as f: f.write('Filetype: Flipper NFC device\n') f.write('Version: 2\n') f.write('# Nfc device type can be UID, Mifare Ultralight, Mifare Classic, Bank card\n') f.write('Device type: Mifare Classic\n') f.write('# UID, ATQA and SAK are common for all formats\n') f.write('UID: ' + add_spaces_to_hex(data['Card']['UID']) + '\n') f.write('ATQA: ' + add_spaces_to_hex(data['Card']['ATQA']) + '\n') f.write('SAK: ' + add_spaces_to_hex(data['Card']['SAK']) + '\n') f.write('# Mifare Classic specific data\n') if guess_mifare_size_by_sak(data['Card']['SAK']) == "4K": f.write('Mifare Classic type: 4K\n') elif guess_mifare_size_by_sak(data['Card']['SAK']) == "1K": f.write('Mifare Classic type: 1K\n') f.write('# Mifare Classic blocks\n') for block in range(0, len(data['blocks'])): f.write('Block ' + str(block) + ': ' + add_spaces_to_hex(data['blocks'] [str(block)]) + '\n')
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