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// +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] |
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// 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> |
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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', | |
] |
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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] |
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#!/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() |
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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') |
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#!/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)] |
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import random | |
a=[ | |
(61608417975397048843788515638593839325111098880518441270527767841153782846066445099077365303960932518098100778959123136871039627996767023258612684873083420234538156646585282154245553305607644427220207313162116929585370583379703086997585339296145409828300576290109728682441066135201997295424597733433471586151L, 60032368056605168202792776655067640210910930719068898740685488293392455428589220656480049668823171895161714617099267690524276842795335016835073541061601545456195765907623303970146386500563913899580929779870429659650425339185233299118860275385880359287380867251468679962048998842668813298548390941601249105855L, '1e4433543ad3eab1d5a5490e33ee98c34785945c7b69dd0fd0a371c28e5ff45f6627ad0559d9837fd6439367543ff5670f4df4fd36cbee75950db62e51811f98e3f34db66b07196a5dfbd9867952d8e6d67c43becf086087181e5f78582e98945e5c8c08d754b998ef01e836729f9620cdcd2cc8aae9cb4bf3d8e4beec3ca8fd'), | |
(520845950547682175226769793427553933063050991694149479605080490571193295371620790711007735401727806998429748389734535178 |
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e = 1048583 | |
d = 20899585599499852848600179189763086698516108548228367107221738096450499101070075492197700491683249172909869748620431162381087017866603003080844372390109407618883775889949113518883655204495367156356586733638609604914325927159037673858380872827051492954190012228501796895529660404878822550757780926433386946425164501187561418082866346427628551763297010068329425460680225523270632454412376673863754258135691783420342075219153761633410012733450586771838248239221434791288928709490210661095249658730871114233033907339401132548352479119599592161475582267434069666373923164546185334225821332964035123667137917080001159691927 | |
x = 22886390627173202444468626406642274959028635116543626995297684671305848436910064602418012808595951325519844918478912090039470530649857775854959462500919029371215000179065185673136642143061689849338228110909931445119687113803523924040922470616407096745128917352037282612768345609735657018628096338779732460743 | |
y = 13835601215715092703311781486294192443763777504037974697077837692193374 |
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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 |
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