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@rfl890
rfl890 / canon.c
Last active December 8, 2024 23:35 — forked from hypernewbie/canon.c
Pachelbel’s Canon in Dmaj in 73 lines of obfuscated C
/* make canon; ./canon | aplay -r 44100 -f U8 */
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define rs (1.0/44100.0)
#define fr(x) (440*pow(2,(x-57)*(1.0/12)))
#define s(x, n) sin((x=(x+fr(n)*rs))*6.2831853)
#define tf (((1.0/rs)*60.)*.25/160.0)
#define gv(c) (c-(c>'9'?('a'-10):'0'))
#define gct(i) (gv(ct[(i)*3]) << 8)+(gv(ct[(i)*3+1]) << 4)+(gv(ct[(i)*3+2]))
@rfl890
rfl890 / aes-ecb-sucks.sh
Last active August 24, 2024 13:37
Shell one-liner to display the weakness of AES-ECB
# requires ffmpeg and curl
curl https://upload.wikimedia.org/wikipedia/commons/thumb/3/35/Tux.svg/864px-Tux.svg.png | ffmpeg -i - -c:v ppm -f image2 - | tail -c +17 | openssl enc -e -aes-256-ecb -K d38b38a2dd476e045c299e8ee5d6466834456d97bd592a71746b423a6a05f386 | head -c -16 | cat <(printf "P6\n864 1024\n255\n") - | ffmpeg -i - -c:v png -f image2 - | ffplay -
@rfl890
rfl890 / main.c
Created May 7, 2024 14:02
Macro Abuse 2: Electric Boogaloo
#include "wtf.h"
MAINF
PRINT("Hello, world!")
ENDMAINF
@rfl890
rfl890 / dice-roll-rdrand.c
Created April 29, 2024 18:12
Dice Roll with RDRAND
#include <stdint.h>
#include <immintrin.h>
#ifdef __GNUC__
#define LOG2(X) \
((uint32_t)(8 * sizeof(unsigned long long) - __builtin_clzll((X)) - 1))
#else
#ifdef _MSC_VER
#include <intrin.h>
inline uint32_t LOG2(uint64_t X) {
#include <stdint.h>
#ifdef __GNUC__
#define LOG2(X) \
((uint32_t)(8 * sizeof(unsigned long long) - __builtin_clzll((X)) - 1))
#else
#ifdef _MSC_VER
#include <intrin.h>
inline uint32_t LOG2(uint64_t X) {
unsigned long out;
@rfl890
rfl890 / timing-safe-equal.js
Created March 13, 2024 19:37
Timing safe comparison in JavaScript
function timingSafeEqual(a, b) {
if (a.length !== b.length) return false;
let result = 0;
for (let i = 0; i < a.length; i++) {
result |= a[i] ^ b[i];
}
return result === 0;
}
From c796842c4aaaca1b640a1fd0e03c9d8e85f571c8 Mon Sep 17 00:00:00 2001
From: rfl890 <87506407+rfl890@users.noreply.github.com>
Date: Wed, 24 Jan 2024 18:14:16 -0500
Subject: [PATCH] Update PRNG
---
src/lib_math.c | 2 +-
src/lj_prng.c | 43 ++++++++++++++++++++++---------------------
2 files changed, 23 insertions(+), 22 deletions(-)
-- Change to the path of lua51.lib/libluajit-2.1.a/whatever LuaJIT library you link against
local lua_slib = "\"C:\\Users\\user\\bin\\luajit\\lib\\lua51.lib\""
local CC = "clang -O2"
local stub_code = [[#include <lua.h>
#include <lauxlib.h>
#include <lualib.h>
#include <luajit.h>
#include <stdlib.h>
@rfl890
rfl890 / color.lua
Created November 30, 2023 22:30
Lua color library
local lib_color = {}
-- Constants
lib_color.color_type = { TYPE_8 = 39710315, TYPE_256 = 34942623, TYPE_RGB = 29505187 }
local FOREGROUND = 1
local BACKGROUND = 2
local ESCAPE = "\x1b["
local RESET = "\x1b[0m"
@rfl890
rfl890 / sha256.c
Created September 11, 2023 18:43
CNG hash
#include <stdio.h>
#include <stdint.h>
#include <Windows.h>
#include <bcrypt.h>
#include <ntstatus.h>
#include <ntdef.h>
typedef struct SHA256State {
BCRYPT_ALG_HANDLE algHandle;