mkow

// +0xABC0 (in .o)
bool ensure_calling_only_once_and_set_key_bit(
        unsigned __int64 addr_to_disasm_if_valid,
        unsigned int key_bit_ind,
        unsigned int a3,
        unsigned int ket_init_unique_id)
{
  char *addr; // rax
  char *retaddr; // [rsp+0h] [rbp+0h]

mkow

// Solver for CRC Recursive Challenge from Dragon CTF 2021
// Author: Michał "Redford" Kowalczyk
//
// Could probably be much simpler, but this code was evolving for too long
// without a rewrite ¯\_(ツ)_/¯

#include <iostream>
#include <cstdio>
#include <cstddef>
#include <cstring>

mkow

def split_by(data, cnt):
    return [data[i : i+cnt] for i in range(0, len(data), cnt)]

MAX_PATH = 150  # just some guessed estimate, should be fine

LEVELS = [
    'rbrr rgb rb  r brgrbrgb  grrgbbg grg bgrg  bbgrbg',
    'rrbrb rg g  bgrbgggr ggrgr gr rg brr  b  bggrbgbb',
    'rbr  bbggrgrggb   bggbb b  b bbrbbgg gbrrbgrbbb g',
]

mkow

from struct import pack, unpack

# reversed from the challenge
def zz_helper(x, y, z):
    if y > z:
        return [1, z - x]
 
    a, b = zz_helper(y, x + y, z)
    if b >= x:
        return [2 * a + 1, b - x]

mkow

#!/usr/bin/env python3
from pwn import *
from hashlib import sha1, sha256
from random import randint

def h(msg):
	# hash = sha256()
	hash = sha1()
	hash.update(msg.encode('ascii'))
	hash = hash.digest()

mkow

import socket
from base64 import b64encode, b64decode
from string import printable

def test(code):
	host = '88.198.154.157'
	port = 8011

	s = socket.create_connection((host, port))
	s.sendall(b64encode(code) + '\n')

mkow

#!/usr/bin/env python2

# Challenge: https://gctf-2019.appspot.com/#challenges/sandbox-sandbox-ridl

from pwn import *
import os

def split_by(data, cnt):
	return [data[i : i+cnt] for i in xrange(0, len(data), cnt)]

mkow

import random

a=[
(61608417975397048843788515638593839325111098880518441270527767841153782846066445099077365303960932518098100778959123136871039627996767023258612684873083420234538156646585282154245553305607644427220207313162116929585370583379703086997585339296145409828300576290109728682441066135201997295424597733433471586151L, 60032368056605168202792776655067640210910930719068898740685488293392455428589220656480049668823171895161714617099267690524276842795335016835073541061601545456195765907623303970146386500563913899580929779870429659650425339185233299118860275385880359287380867251468679962048998842668813298548390941601249105855L, '1e4433543ad3eab1d5a5490e33ee98c34785945c7b69dd0fd0a371c28e5ff45f6627ad0559d9837fd6439367543ff5670f4df4fd36cbee75950db62e51811f98e3f34db66b07196a5dfbd9867952d8e6d67c43becf086087181e5f78582e98945e5c8c08d754b998ef01e836729f9620cdcd2cc8aae9cb4bf3d8e4beec3ca8fd'),
(520845950547682175226769793427553933063050991694149479605080490571193295371620790711007735401727806998429748389734535178

mkow

e = 1048583
d = 20899585599499852848600179189763086698516108548228367107221738096450499101070075492197700491683249172909869748620431162381087017866603003080844372390109407618883775889949113518883655204495367156356586733638609604914325927159037673858380872827051492954190012228501796895529660404878822550757780926433386946425164501187561418082866346427628551763297010068329425460680225523270632454412376673863754258135691783420342075219153761633410012733450586771838248239221434791288928709490210661095249658730871114233033907339401132548352479119599592161475582267434069666373923164546185334225821332964035123667137917080001159691927

x = 22886390627173202444468626406642274959028635116543626995297684671305848436910064602418012808595951325519844918478912090039470530649857775854959462500919029371215000179065185673136642143061689849338228110909931445119687113803523924040922470616407096745128917352037282612768345609735657018628096338779732460743

y = 13835601215715092703311781486294192443763777504037974697077837692193374

mkow

import sys

VMCF_OP0      =  0
VMCF_OP1      =  1
VMCF_OP2      =  2
VMCF_OPMASK   =  3
VMCF_BYTEMODE =  4
VMCF_JUMP     =  8
VMCF_PROC     = 16
VMCF_USEFLAGS = 32