Who knew invoices could be secure AND cute? Our third-party contractor for space shuttle parts is using the best tooling for sending us secure invoices.
Solution
from pikepdf import Pdf
from PySide6 import QtCore
# https://github.com/IJHack/QtPass/blob/master/src/passwordconfiguration.h shows charset
charset = list('ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890~!@#$%^&*()_-+={}[]|:;<>,.?')
password_len = 16 # Screeshot shows 16
# https://github.com/IJHack/QtPass/issues/338
# QTime::msec indicates this is merely "the millisecond part (0 to 999) of the time", e.g. only 1000 possibilities of generated sequences of passwords
for x in range(1, 1000):
password = ''
# https://www.cplusplus.com/reference/random/minstd_rand/
# The generator has a single value as state, which is modified by its transition algorithm on each advance like x is modified in the following piece of code:
# x = x * 48271 % 214748364
state = x * 48271 % 2147483647
for i in range(password_len):
index = state % len(charset) # int index = Util::rand() % charset.length();
nextChar = charset[index] # QChar nextChar = charset.at(index);
password += str(nextChar) # passwd.append(nextChar);
state = state * 48271 % 2147483647
try:
# Try to open PDF with this password, print if correct
pdf = Pdf.open('invoice.pdf', password=str(password))
print('correct password: ' + str(password))
print(pdf)
exit(0)
except Exception as e:
print('incorrect password: ' + str(password))
