0xTowel

#!/usr/bin/env python3
# -*- coding:utf-8 -*-
# Towel 2017

from math import ceil, sqrt


def bsgs(g, h, p):
    '''
    Solve for x in h = g^x mod p given a prime p.

0xTowel

/* SeeSP: Print the value of the stack pointer.
 * Build: gcc SeeSP.c -o SeeSP
 *
 * Towel - 2017
 */
#include <stdio.h>
#include <inttypes.h>

int main(void)
{

0xTowel

/* Naslr: Starts a bash shell with no ASLR
 * Build: gcc naslr.c -o naslr
 *
 * Towel - 2017
 */
#include <sys/personality.h>
#include <syscall.h>
#include <unistd.h>
#include <stdlib.h>
#include <err.h>

0xTowel

/*
 * ------------------------------------------------------------
 * "THE MATEWARE LICENSE" (Revision 1):
 * <author> wrote this code. As long as you retain this notice,
 * you can do whatever you want with this code. If you meet
 * <author> someday, and you think this code is worth it,
 * you can buy <author> a mate in return.
 * ------------------------------------------------------------
*/

0xTowel

" My bare-minimum, portable vimrc
inoremap <special> jk <ESC>
inoremap <special> kj <ESC>

set clipboard^=unnamedplus
set relativenumber
set number
set backspace=eol,start,indent
set whichwrap+=<,>,h,l
set ignorecase

0xTowel

BITS 32
global _start
section .text

SYS_EXECVE equ 0x0b

_start:
    xor ecx, ecx       ; argv to zero
    mul ecx            ; envp to zero, eax to zero
    add al, SYS_EXECVE ; syscall 11 for execve

0xTowel

The following bytes are considered whitespace in C and POSIX locales:

0c0a0d090b20

They will end input to functions such as scanf("%s").

Byte	Escape Sequence	Name
0c	\f	form-feed
0a	\n	newline

0xTowel

#!/usr/bin/env sage
# -*- coding: utf-8 -*-
# Towel 2019

"""
Solution to 'Biggars' challenge from FireShell CTF 2019.
A multi-prime RSA computation with large N requiring CRT
to compute d rather than normal fast-power algorithm.
"""

0xTowel

[context]
clear_screen = True
layout = regs code stack memory args extra
show_registers_raw = False
nb_lines_stack = 6

0xTowel

#!/usr/bin/env python3
"""A small example utility to demonstrate r2pipe scripting
by extracting resources from a file.

Written as an example for someone on IRC.

--Towel, 2019
"""

import r2pipe