#!/usr/bin/env sed -re s|^|\x20\x20\x20\x20| -e s|^\x20{4}\x23\x23{(.*)$|<details><summary>\1</summary>\n| -e s|^\x20{4}\x23\x23}$|\n</details>| -e s|^\x20{4}\x23\x23\x20?|| -e s|\x0c|\x20|
# Yannakakis.py by Paul Khuong
#
# To the extent possible under law, the person who associated CC0 with
# Yannakakis.py has waived all copyright and related or neighboring rights
# to Yannakakis.py.
This is a function that can convert between arbitrary bases implemented in both Javascript and Python.
Many existing implementations, such as https://rot47.net/base.html or https://gist.github.com/inflammable/2929362 use a number as the internal representation, and thus can't safely encode/decode more than 8 letters of Base64 encoded text, or 9 letters of Base58 text (which isn't enough for parsing a Bitcoin address).
Other implementations rely on complicated third party libraries for bignum (e.g. https://rosettacode.org/wiki/Non-decimal_radices/Convert#JavaScript).
Several implementations required converting to Uint8Arrays (Base 256) as an intermediate. Others were essentially ports of complicated C implementations (see https://github.com/cryptocoinjs/base-x/blob/master/src/index.js).
X-MAS CTF 2020 was my first CTF – I do ROM hacking, fan translation, and hardware modding, but I haven't done much hacking related to modern systems, so I was a wee bit worried there wouldn't be many challenges suited to my skillset. Imagine my surprise and delight, then, when I saw the challenge Ken Kutaragi's Secret Code, which consists of a PlayStation executable! And wouldn't you know it? I've hacked away at quite a few PS1 games in my day! Not many people solved it, likely because it requires quite niche skills – so let me share those with you!
The challenge description is as follows.
| // MIT License | |
| // | |
| // Copyright (c) 2019 Simon Lightfoot | |
| // | |
| // Permission is hereby granted, free of charge, to any person obtaining a copy | |
| // of this software and associated documentation files (the "Software"), to deal | |
| // in the Software without restriction, including without limitation the rights | |
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
| // copies of the Software, and to permit persons to whom the Software is | |
| // furnished to do so, subject to the following conditions: |
| /* | |
| Put this CSS in a file that loads after the bootstrap.css | |
| Eg. Inside wp-checkout/views/bootstrap/style.css | |
| Start each Bootstrap class you want to override with .checkout ... | |
| This example will remove the rounded corners from the button. | |
| It will make the button pink with black text. | |
| And on hover, active or focus the button will be red with white text | |
| */ |
| development: | |
| adapter: mysql2 | |
| encoding: utf8 | |
| database: my_database | |
| username: root | |
| password: | |
| apt: | |
| - somepackage | |
| - anotherpackage |
| ## Rule: http://benchmarksgame.alioth.debian.org/u32/performance.php?test=threadring#about | |
| ## Source Code: https://github.com/kakilangit/benchmarks/tree/master/thread-ring | |
| # Model Name: MacBook Pro | |
| # Model Identifier: MacBookPro11,1 | |
| # Processor Name: Intel Core i5 | |
| # Processor Speed: 2.6 GHz | |
| # Number of Processors: 1 | |
| # Total Number of Cores: 2 | |
| #pass=50.000.000 threads/actors/goroutines=503 |
| --[[ json.lua | |
| A compact pure-Lua JSON library. | |
| The main functions are: json.stringify, json.parse. | |
| ## json.stringify: | |
| This expects the following to be true of any tables being encoded: | |
| * They only have string or number keys. Number keys must be represented as | |
| strings in json; this is part of the json spec. |
| None of these 3 letter-only usernames below are available anymore as of 2021. | |
| However, if you use numbers and symbols, or accept 4 letters, you can definitely find a free one. | |
| Check responsibly. Don't spam the github API/support, it's not a race, there are plenty free if you have imagination. | |
| agq, ahq, aqf, aqg, aqp, aqt, aqf, aqy, atq, auh, ayp, azj, azq, bey, bgt, bgx, bhq, bkk, bkq, bmq, | |
| bpp, bpq, bqa, bqc, bqg, bqi, bqj, bql, bqn, bqo, bqp, bqr, bqt, bqy, buo, buq, bwz, bxe, bxo, bxw, | |
| bzn, bzp, cfl, ckg, ckq, cnq, cpq, cpz, cqa, cqe, cqf, cqg, cqk, cqo, cqp, cqf, cqx, cqz, cud, cuh, | |
| cuk, cuo, cfl, cxe, czo, dkq, dnq, dqg, dqi, dqk, dqo, dqs, dsr, dtq, dxe, eaj, eaq, ebq, ecl, ecy, | |
| eer, efq, efy, egq, egx, ehh, ehz, eiu, eiw, eiy, ejx, eoq, eou, epj, eqa, eqb, eqf, eqg, eqj, eqk, | |
| eqs, eqf, eqw, eqz, erq, etq, eub, euf, euj, euq, euf, efq, efy, ewy, ewz, exn, eyh, eyj, eyn, eyq, |
