crypto_warmup.py

import random
import math

n = 24

def make_stuff():
    A = []; b = [1, 10]
    for i in range(n):
        A.append(random.randint(*b))
        b[False] = sum(A) + 1
        b[True] = int(b[False] << 1)
    c = random.randint(sum(A), sum(A) << 1)
    while True:
        d = random.randint(sum(A), sum(A) << 1)
        if math.gcd(c, d) == 1:
            break

    return [(d*w) % c for w in A]


def weird_function_1(s):
    return sum([list(map(int,bin(ord(c))[2:].zfill(8))) for c in s], [])

def do_magic(OooO, B):
    return sum(m * b for m, b in zip(weird_function_1(OooO), B))

B = make_stuff()

with open("flag") as fd:
    flag = fd.read().strip()

print(B)
for i in range(0, len(flag), 3):
    print(do_magic(flag[i:i+3], B))
    


##[4267101277, 4946769145, 6306104881, 7476346548, 7399638140, 1732169972, 1236242271, 5109093704, 2163850849, 6552199249, 3724603395, 3738679916, 5211460878, 642273320, 3810791811, 761851628, 1552737836, 4091151711, 1601520107, 3117875577, 2485422314, 1983900485, 6150993150, 2045278518]

##34451302951
##58407890177
##49697577713
##45443775595
##38537028435
##47069056666
##49165602815
##43338588490
##32970122390