/
tsi_parser.py
68 lines (54 loc) · 2.34 KB
/
tsi_parser.py
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import logging
from log_util import init_logging
import binascii
from bit_tools import BitFlag
from bit_tools import CompositeBitFlag
from bit_tools import Nibble
from bit_tools import bit_flag_is_set_in_byte_list
from bit_tools import hex_string_to_byte_list
from text_utils import report_header
def construct_tsi_bit_flags():
'''
# EMV 4.2 Book 3 = Application Specification
# Annex C = Coding Data Elements Used in Trans Processing
# C6 = Transaction Status Information
# 1 => LSB, 8 => MSB
'''
bit_flag_list = []
# Byte 1
bit_flag_list.append(BitFlag(1, 8, 'Offline data authentication was performed'))
bit_flag_list.append(BitFlag(1, 7, 'Cardholder verification was performed'))
bit_flag_list.append(BitFlag(1, 6, 'Card risk management was performed'))
bit_flag_list.append(BitFlag(1, 5, 'Issuer authentication was performed'))
bit_flag_list.append(BitFlag(1, 4, 'Terminal risk management was performed'))
bit_flag_list.append(BitFlag(1, 3, 'Script processing was performed'))
bit_flag_list.append(BitFlag(1, 2, 'RFU'))
bit_flag_list.append(BitFlag(1, 1, 'RFU'))
# Byte 2
bit_flag_list.append(BitFlag(2, 8, 'RFU'))
bit_flag_list.append(BitFlag(2, 7, 'RFU'))
bit_flag_list.append(BitFlag(2, 6, 'RFU'))
bit_flag_list.append(BitFlag(2, 5, 'RFU'))
bit_flag_list.append(BitFlag(2, 4, 'RFU'))
bit_flag_list.append(BitFlag(2, 3, 'RFU'))
bit_flag_list.append(BitFlag(2, 2, 'RFU'))
bit_flag_list.append(BitFlag(2, 1, 'RFU'))
return bit_flag_list
def parse_tsi(tsi_hex_string):
report = []
for l in report_header('TSI : Transaction Status Information', '='): report.append(l)
report.append('raw hex %s' % tsi_hex_string)
tsi_byte_list = hex_string_to_byte_list(tsi_hex_string)
report.append(' hex %s' % '.'.join(['%02X' % x for x in tsi_byte_list]))
report.append(' dec %s' % '.'.join(['%i' % x for x in tsi_byte_list]))
for l in report_header('Bit Flags', '-'): report.append(l)
tsi_flags = construct_tsi_bit_flags()
for flag in tsi_flags:
if (bit_flag_is_set_in_byte_list(tsi_byte_list, flag) == True):
report.append(flag.description)
for line in report:
logging.info(line)
if __name__ == '__main__':
init_logging(file_name='/logs/tsi_parser')
sample_tsi = 'E800'
parse_tsi(sample_tsi)