Project Sekai
🔒 UMDCTF 2023 / ✅-rev-welcome-to-python
Assgent
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from math import sqrt, sin, cos
from ctypes import c_uint32, c_float
from sys import exit as exit_
source = [
672662614,
741343303,
495239261,
744259788,
722021046,
0xA70AA247L,
1053692,
0xA8050035L,
0xA982A820L,
624689,
0xA90D20BCL,
41134,
295340,
0xA0028102L,
622681,
576469,
671170814,
0x8041086EL,
765,
680595550,
0x80200166L,
698368102,
2437137,
0x8042C1EEL,
570966112,
4612341,
0x800008D4L,
0xA94D02CEL,
16484,
2103301,
136226,
9438506,
663820758,
0x8013523BL,
8405532,
0xA4000875L,
0x80030A78L,
136768]
seed = 64
def wandom(x):
return x * x * cos(x) * sin(x) / 1000
def evil_bit_hack(y):
return int(c_uint32.from_buffer(c_float(y)).value)
print('==========================================')
print('Professional flag checker service (v 97.2)')
print('==========================================')
flag = input('Show me the flag: ')
lf = len(flag)
ls = len(source)
l = lf if lf < ls else ls
for i in range(seed, seed + l):
w = wandom(i)
c = ~(~ord(flag[i - seed]) ^ evil_bit_hack(wandom(wandom(w))) & evil_bit_hack(w)) + 1
if source[i - seed] != c:
print("Uh oh! We don't think your flag is correct... :(")
exit_(1)
if lf == ls:
print('Your flag is correct!')
return None
None('Some of your flag is correct...')
