Skip to content

feat: add value block and 7-byte UID support #19

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
li0ard wants to merge 1 commit into
base: master
Choose a base branch
from
Open

feat: add value block and 7-byte UID support #19

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
49 changes: 45 additions & 4 deletions mfdread.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -9,14 +9,15 @@
import codecs
import copy
import sys
from datetime import datetime, timedelta
from collections import defaultdict

from bitstring import BitArray


class Options:
FORCE_1K = False

UID_LENGTH = 4

if len(sys.argv) == 1:
sys.exit('''
Expand Down Expand Up @@ -127,6 +128,14 @@ def accbit_info(accbits, sector_size):
access_bits[i] = accbits_for_blocknum(accbits, i)
return access_bits

def is_value_block(block):
b = bytes.fromhex(block)
return (b[0] == b[8] and (b[0] ^ 0xFF) == b[4]) and \
(b[1] == b[9] and (b[1] ^ 0xFF) == b[5]) and \
(b[2] == b[10] and (b[2] ^ 0xFF) == b[6]) and \
(b[3] == b[11] and (b[3] ^ 0xFF) == b[7]) and \
(b[12] == b[14] and b[13] == b[15] and \
(b[12] ^ 0xFF) == b[13])

def print_info(data):
blocksmatrix = []
Expand Down Expand Up @@ -185,11 +194,36 @@ def print_info(data):

blocksmatrix[c][sector_size] = keyA + accbits + keyB

if Options.UID_LENGTH == 4:
sakStart = Options.UID_LENGTH * 2 + 2
else:
sakStart = Options.UID_LENGTH * 2

print("File size: %d bytes. Expected %d sectors" % (len(data), sector_number))
print("\n\tUID: " + blocksmatrix[0][0][0:8])
if Options.UID_LENGTH == 4:
print("\n\tUID: " + blocksmatrix[0][0][0:8])
else:
print("\n\tUID: " + blocksmatrix[0][0][0:14])
print("\tBCC: " + blocksmatrix[0][0][8:10])
print("\tSAK: " + blocksmatrix[0][0][10:12])
print("\tATQA: " + blocksmatrix[0][0][12:14])
print("\tSAK: " + blocksmatrix[0][0][sakStart:sakStart + 2])
print("\tATQA: " + blocksmatrix[0][0][sakStart + 2:sakStart + 6])
# Code taken from https://github.com/ikarus23/MifareClassicTool
try:
year = int(blocksmatrix_clear[0][0][30:32])
week = int(blocksmatrix_clear[0][0][28:30])
now = datetime.now().year - 2000
if year >= 0 and year <= now and week >= 1 and week <= 53:
# "fromisocalendar" available only in >= Python 3.8
try:
calendar = datetime.fromisocalendar(year + 2000, week, 1)
startDate = calendar.strftime("%d.%m.%Y")
endDate = (calendar + timedelta(days=6)).strftime("%d.%m.%Y")
print("\tYear of manufacture: Between {} and {}".format(startDate, endDate))
except:
pass
except:
pass

print(" %sKey A%s %sAccess Bits%s %sKey B%s" % (
bashcolors.RED, bashcolors.ENDC, bashcolors.GREEN, bashcolors.ENDC, bashcolors.BLUE, bashcolors.ENDC))
print("╔═════════╦═══════╦══════════════════════════════════╦════════╦═════════════════════════════════════╗")
Expand Down Expand Up @@ -224,6 +258,9 @@ def print_info(data):
else:
qn = ""

if is_value_block(blocksmatrix_clear[q][z]):
blocksmatrix[q][z] = bashcolors.WARNING + blocksmatrix_clear[q][z] + bashcolors.ENDC

print("║ %-5s║ %-3d ║ %s ║ %s ║ %-35s ║ %s" % (qn, block_number, blocksmatrix[q][z],
accbits, permissions,
decode(blocksmatrix_clear[q][z])))
Expand All @@ -246,6 +283,10 @@ def main(args):
args.pop(0)
Options.FORCE_1K = True

if args[0] == "-7":
args.pop(0)
Options.UID_LENGTH = 7

filename = args[0]
with open(filename, "rb") as f:
data = f.read()
Expand Down