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tvr_parser.py
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tvr_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 bit_flag_is_set_in_byte_list
from bit_tools import hex_string_to_byte_list
from text_utils import report_header
def construct_tvr_bit_flags():
'''
# EMV 4.2 Book 3 = Application Specification
# Annex C = Coding Data Elements Used in Trans Processing
# C5 = Terminal Verification Results
# 1 => LSB, 8 => MSB
'''
bit_flag_list = []
# Byte 1
bit_flag_list.append(BitFlag(1, 8, 'Offline data authentication was not performed'))
bit_flag_list.append(BitFlag(1, 7, 'SDA failed'))
bit_flag_list.append(BitFlag(1, 6, 'ICC data missing'))
bit_flag_list.append(BitFlag(1, 5, 'Card appears on terminal exception file'))
bit_flag_list.append(BitFlag(1, 4, 'DDA failed'))
bit_flag_list.append(BitFlag(1, 3, 'CDA failed'))
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, 'ICC and terminal have different application versions'))
bit_flag_list.append(BitFlag(2, 7, 'Expired application'))
bit_flag_list.append(BitFlag(2, 6, 'Application not yet effective'))
bit_flag_list.append(BitFlag(2, 5, 'Requested service not allowed for card product'))
bit_flag_list.append(BitFlag(2, 4, 'New card'))
bit_flag_list.append(BitFlag(2, 3, 'RFU'))
bit_flag_list.append(BitFlag(2, 2, 'RFU'))
bit_flag_list.append(BitFlag(2, 1, 'RFU'))
# Byte 3
bit_flag_list.append(BitFlag(3, 8, 'Cardholder verification was not successful'))
bit_flag_list.append(BitFlag(3, 7, 'Unrecognised CVM'))
bit_flag_list.append(BitFlag(3, 6, 'PIN Try Limit exceeded'))
bit_flag_list.append(BitFlag(3, 5, 'PIN entry required and PIN pad not present or not working'))
bit_flag_list.append(BitFlag(3, 4, 'PIN entry required, PIN pad present, but PIN was not entered'))
bit_flag_list.append(BitFlag(3, 3, 'Online PIN entered'))
bit_flag_list.append(BitFlag(3, 2, 'RFU'))
bit_flag_list.append(BitFlag(3, 1, 'RFU'))
# Byte 4
bit_flag_list.append(BitFlag(4, 8, 'Transaction exceeds floor limit'))
bit_flag_list.append(BitFlag(4, 7, 'Lower consecutive offline limit exceeded'))
bit_flag_list.append(BitFlag(4, 6, 'Upper consecutive offline limit exceeded'))
bit_flag_list.append(BitFlag(4, 5, 'Transaction selected randomly for online processing'))
bit_flag_list.append(BitFlag(4, 4, 'Merchant forced transaction online'))
bit_flag_list.append(BitFlag(4, 3, 'RFU'))
bit_flag_list.append(BitFlag(4, 2, 'RFU'))
bit_flag_list.append(BitFlag(4, 1, 'RFU'))
# Byte 5
bit_flag_list.append(BitFlag(5, 8, 'Default TDOL used'))
bit_flag_list.append(BitFlag(5, 7, 'Issuer authentication failed'))
bit_flag_list.append(BitFlag(5, 6, 'Script processing failed before final GENERATE AC'))
bit_flag_list.append(BitFlag(5, 5, 'Script processing failed after final GENERATE AC'))
bit_flag_list.append(BitFlag(5, 4, 'RFU'))
bit_flag_list.append(BitFlag(5, 3, 'RFU'))
bit_flag_list.append(BitFlag(5, 2, 'RFU'))
bit_flag_list.append(BitFlag(5, 1, 'RFU'))
return bit_flag_list
def parse_tvr(tvr_hex_string):
report = []
for l in report_header('TVR : Terminal Verification Results', '='): report.append(l)
report.append('raw hex %s' % tvr_hex_string)
tvr_byte_list = hex_string_to_byte_list(tvr_hex_string)
report.append(' hex %s' % '.'.join(['%02X' % x for x in tvr_byte_list]))
report.append(' dec %s' % '.'.join(['%i' % x for x in tvr_byte_list]))
for l in report_header('Bit Flags', '-'): report.append(l)
tvr_flags = construct_tvr_bit_flags()
for flag in tvr_flags:
if (bit_flag_is_set_in_byte_list(tvr_byte_list, flag) == True):
report.append(flag.description)
for line in report:
logging.info(line)
if __name__ == '__main__':
init_logging(file_name='/logs/tvr_parser')
# sample_tvr = '8000048000'
sample_tvr = '0000008000'
parse_tvr(sample_tvr)
'''
# Byte 2
bit_flag_list.append(BitFlag(1, 1, ''))
bit_flag_list.append(BitFlag(1, 2, ''))
bit_flag_list.append(BitFlag(1, 3, ''))
bit_flag_list.append(BitFlag(1, 4, ''))
bit_flag_list.append(BitFlag(1, 5, ''))
bit_flag_list.append(BitFlag(1, 6, ''))
bit_flag_list.append(BitFlag(1, 7, ''))
bit_flag_list.append(BitFlag(1, 8, ''))
'''