msr90/msr90.py

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Python
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#!/usr/bin/env python
# MSR90 Magnetic Stripe Reader - Developed by acidvegas in Python (https://git.acid.vegas/msr90)
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'''
Notes:
- Currently only supports reading VISA cards, will add support for Mastercard, License, Gift Cards, etc.
'''
import getpass
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import re
# Define ANSI color codes
YELLOW = '\033[93m'
CYAN = '\033[96m'
GRAY = '\033[90m'
RESET = '\033[0m'
def format_pan(pan: str) -> str:
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'''
Format the Primary Account Number (PAN) by grouping the digits in sets of 4
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:param pan: The Primary Account Number (PAN) to format
'''
return ' '.join(pan[i:i+4] for i in range(0, len(pan), 4))
def format_exp_date(exp_date: str) -> str:
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'''
Format the expiration date to be MM/YY
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:param exp_date: The expiration date to format
'''
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return exp_date[2:4] + '/' + exp_date[0:2]
def service_code_descriptions(digit: int, code: str) -> str:
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'''
Get the description for the service code digit
:param digit: The digit number (1, 2, or 3)
:param code: The code value for the digit
'''
descriptions = {
'1': {
'1': 'International interchange OK',
'2': 'International interchange, use IC (chip) where feasible',
'5': 'National interchange only except under bilateral agreement',
'6': 'National interchange only, use IC (chip) where feasible',
'7': 'No interchange except under bilateral agreement (closed loop)',
'9': 'Test'
},
'2': {
'0': 'Normal',
'2': 'Contact issuer via online means',
'4': 'Contact issuer via online means except under bilateral agreement'
},
'3': {
'0': 'No restrictions, PIN required',
'1': 'No restrictions',
'2': 'Goods and services only (no cash)',
'3': 'ATM only, PIN required',
'4': 'Cash only',
'5': 'Goods and services only (no cash), PIN required',
'6': 'No restrictions, use PIN where feasible',
'7': 'Goods and services only (no cash), use PIN where feasible'
}
}
return descriptions[str(digit)].get(code, 'Unknown')
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def parse_magnetic_stripe(data: str):
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'''
Parse the magnetic stripe data and print the results
:param data: The raw magnetic stripe data to parse
'''
track1_match = re.search(r'^%([AB])(\d{1,19})\^([^\^]{2,26})\^(\d{4})(\d{3})([^\?]*?)\?(\w?)', data)
track2_match = re.search(r';(\d{1,19})=(\d{4})(\d{3})(.*?)\?$', data)
track3_match = re.search(r'(\+[^\?]+\?)', data)
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if track1_match:
format_code, pan, name, exp_date, service_code, discretionary_data, lrc = track1_match.groups()
if format_code == 'A':
raise ValueError('Track 1 data is using format code A which is not supported')
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formatted_pan = format_pan(pan)
formatted_exp_date = format_exp_date(exp_date)
desc1 = service_code_descriptions(1, service_code[0])
desc2 = service_code_descriptions(2, service_code[1])
desc3 = service_code_descriptions(3, service_code[2])
print('Track 1 Data:')
print(f'{YELLOW}Format Code {GRAY}|{RESET} {format_code} - Financial cards (ISO/IEC 7813)')
print(f'{YELLOW}Primary Account Number (PAN) {GRAY}|{RESET} {formatted_pan}')
print(f'{YELLOW}Cardholder Name {GRAY}|{RESET} {name}')
print(f'{YELLOW}Expiration Date {GRAY}|{RESET} {formatted_exp_date}')
print(f'{YELLOW}Service Code Digit 1 {GRAY}|{RESET} {service_code[0]}: {desc1}')
print(f'{YELLOW}Service Code Digit 2 {GRAY}|{RESET} {service_code[1]}: {desc2}')
print(f'{YELLOW}Service Code Digit 3 {GRAY}|{RESET} {service_code[2]}: {desc3}')
print(f'{YELLOW}Discretionary Data {GRAY}|{RESET} {discretionary_data}')
print(f'{YELLOW}LRC (optional) {GRAY}|{RESET} {lrc}')
print(f'{YELLOW}Raw Track Data {GRAY}|{RESET} {track1_match.group(0)}')
else:
generic_track1 = re.search(r'(%[^?]+\?)', data)
if generic_track1:
print('Track 1 Data:')
print(f'{YELLOW}Raw Track Data {GRAY}|{RESET}' + generic_track1.group(1))
else:
raise ValueError(f'Track 1 data is not found (data: {data})')
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if track2_match:
pan, exp_date, service_code, discretionary_data = track2_match.groups()
formatted_pan = format_pan(pan)
formatted_exp_date = format_exp_date(exp_date)
print('Track 2 Data:')
print(f'{CYAN}Primary Account Number (PAN) {GRAY}|{RESET} {formatted_pan}')
print(f'{CYAN}Expiration Date {GRAY}|{RESET} {formatted_exp_date}')
print(f'{CYAN}Service Code {GRAY}|{RESET} {service_code}')
print(f'{CYAN}Discretionary Data {GRAY}|{RESET} {discretionary_data}')
print(f'{CYAN}Raw Track Data {GRAY}|{RESET} {track2_match.group(0)}')
else:
generic_track2 = re.search(r'(;[^\?]+\?)', data)
if generic_track2:
print('Track 2 Data:')
print(f'{CYAN}Raw Track Data {GRAY}|{RESET}' + generic_track2.group(1))
else:
raise ValueError(f'Track 2 data is not found (data: {data})')
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if track3_match:
print('Track 3 Data:')
print(f'{GRAY}Raw Track Data {GRAY}|{RESET} {track3_match.group(0)}')
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else:
raise ValueError(f'Track 3 data is not found (data: {data})')
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if __name__ == '__main__':
swipe_data = getpass.getpass(prompt='Please swipe the card: ')
parse_magnetic_stripe(swipe_data)