samcamwilliams’s gists

samcamwilliams / rx_bitmap_sim.erl

Last active December 1, 2024 23:58

An Erlang simulator of the effectiveness of bitmap attacks on RandomX scratchpad entropy, given various parameters. It also simulates these attacks against RandomXSquared; a new algorithm that optimizes the resilience of RandomX entropy generation by mixing entropy (optionally across multiple parallel RX instances) periodically.

	-module(rx_bitmap_sim).
	-compile(export_all).

	%%% A simple simulator for the RX and RX2 scratchpad bitmap attacks.
	%%% run `rx_bitmap_sim:create_report(ProgCount, Divisions)` to see the sizes of bitmaps
	%%% that would be needed in order to reconstruct the scratchpad from the
	%%% bitmap for N RandomX programs, with D divisions of the programs.

	% The number of RX memory cells in the scratchpad.
	-define(SCRATCHPAD_CELLS, 262144).

samcamwilliams / launch.json

Created September 7, 2024 04:59

Run rebar3 + Erlang in debug mode inside VS Code for LLDB debugging. This is useful for debugging linked-in drivers (and possibly NIFs, too). It is a ghastly construction, but it works (assuming you update the paths of course). The '--' twice is very strange but necessary. It seems that both lldb and Erlang using '--' as a signifier for their ar…

	{
	"version": "0.2.0",
	"configurations": [
	{
	"name": "(lldb) Launch",
	"type": "cppdbg",
	"request": "launch",
	"program": "${workspaceFolder}/../otp/bin/aarch64-apple-darwin22.6.0/beam.debug.smp",
	"args": [
	"--", "--",

samcamwilliams / receive-tests.lua

Created July 8, 2024 05:41

Extremely crude tests for AOS's new process+message management API.

	function CreateBasicCO()
	return coroutine.create(function ()
	print("Coroutine started")
	Send({ Target = ao.id, Action = "TestMessage" })
	local msg = BasicReceive({ Target = ao.id, Action = "TestMessage" })
	X = msg
	print(msg)
	print("Started again. Respond to stuff here.")
	return msg
	end)

samcamwilliams / mass-upload.js

Created August 18, 2021 10:14

	const Arweave = require('arweave');
	const arweave = Arweave.init({ host: 'arweave.net', protocol: 'https', port: 443 });

	const fs = require('fs');
	const deepHash = require('arweave/node/lib/deepHash');
	const ArweaveBundles = require('arweave-bundles');

	const deps = {
	utils: Arweave.utils,
	crypto: Arweave.crypto,

samcamwilliams / PublicSquare.js

Created January 9, 2021 03:00


	const fs = require('fs')
	const Arweave = require('arweave/node')
	const argv = require('yargs').argv

	const arweave = Arweave.init({
	host: argv.arweaveHost ? argv.arweaveHost : 'arweave.net',
	port: argv.arweavePort ? argv.arweavePort : 443,
	protocol: argv.arweaveProtocol ? argv.arweaveProtocol : 'https'
	})

samcamwilliams / Physical-Asset-NFT.js

Created January 8, 2021 03:22

A Verto-compatible SmartWeave contract for trading physical assets.

	export function handle (state, action) {
	const owner = state.owner
	const input = action.input
	const caller = action.caller
	const contact = action.contact

	if (input.function === 'transfer') {
	const target = input.target

	if (!target \|\| (caller === target)) {

samcamwilliams / CryptoVoxelsArchive.sh

Created November 21, 2020 02:52

Download the state of all land parcels in CryptoVoxels and deploy them to the Arweave's permaweb. Path to your Arweave keyhole must be changed in the `arweave deploy` line.

	#!/bin/bash

	mkdir -p CryptoVoxelsArchive/parcels

	echo "Downloading map info..."

	curl -s 'https://www.cryptovoxels.com/api/parcels.json' > CryptoVoxelsArchive/parcels.json
	curl -s 'https://www.cryptovoxels.com/api/suburbs.json' > CryptoVoxelsArchive/suburbs.json
	curl -s 'https://www.cryptovoxels.com/api/islands.json' > CryptoVoxelsArchive/islands.json

samcamwilliams / EdLock.sol

Created May 18, 2019 20:56

	pragma solidity ^0.5.1;

	contract EdLock {
	address payable honeypot;
	uint unlockTime;
	uint payoutQty;
	uint payoutQtySteal;
	address payable[] payoutAddrs;
	bool paidOut = false;

samcamwilliams / keyboard_morse

Last active January 1, 2017 20:12

An Erlang script that uses morse code to send messages to @lelandbatey's keyboard.

	#!/usr/bin/env escript

	%%% USAGE: ./keyboard_morse STRING
	%%% Uses morse code to send messages to a keyboard light that flashes
	%%% when a web server request is made. See here[1] for details.
	%%% This script could be modified to communicate with other kinds of
	%%% devices by changing the emit_flash/0 function.
	%%%
	%%% [1] http://lelandbatey.com/posts/2016/12/Making-lights-blink-for-each-HTTP-request/

Sam Williams samcamwilliams