billautomata’s gists

billautomata / modular_exponentiation.c

Last active February 5, 2016 04:04

modular multiplicative inverse

	#include <msp430.h>

	// memory efficient modular exponentiation
	//
	// calculate c, where - (b^e) mod m = c
	// b is the plaintext
	// e is the secret key
	// m is phi(n) the totient of the public key, a number derived from the public key components

	//

billautomata / gist:eda5c5cd98a895493253

Created February 3, 2016 01:57

ttl computer parts list

	4-Bit Counter:
	74161 - http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?freeText=74161&langId=-1&storeId=10001&productId=49664&search_type=jamecoall&catalogId=10001&ddkey=http:StoreCatalogDrillDownView

	4-Bit Register (I use two for each 8-bit register):
	74LS173 - http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?freeText=74LS173&langId=-1&storeId=10001&productId=46922&search_type=jamecoall&catalogId=10001&ddkey=http:StoreCatalogDrillDownView

	2-1 Multiplexer:
	74LS157 - http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_46771_-1

	16x8 RAM (output needs to be inverted):

billautomata / ssh_tunnels.sh

Last active January 9, 2025 01:10

ssh port forwarding cheatsheet

	# local port forwarding
	# the target host 192.168.0.100 is running a service on port 8888
	# and you want that service available on the localhost port 7777

	ssh -L 7777:localhost:8888 [email protected]

	# remote port forwarding
	# you are running a service on localhost port 9999
	# and you want that service available on the target host 192.168.0.100 port 12340

billautomata / write_iso_to_usb_osx.sh

Last active December 28, 2015 14:08

write file to usb drive and boot it, osx

	!#/usr/bin/env bash

	sudo diskutil list
	sudo diskutil unmountDevice /dev/disk3 # could be disk 2 or disk 4, check the list
	sudo dd if=file.iso of=/dev/rdisk3 bs=16m # again, could be disk2 or disk4

billautomata / hrmm.js

Created December 26, 2015 19:46

createDiffieHellman derps

	var assert = require('assert')
	var crypto = require('crypto')
	var fs = require('fs')

	var alice = crypto.createDiffieHellman(2048)
	alice.setPrivateKey(fs.readFileSync('../alice.private.pem').toString('hex'),'hex')
	alice.setPublicKey(fs.readFileSync('../alice.public.pem').toString('hex'),'hex')

	var bob = crypto.createDiffieHellman(2048)
	bob.setPrivateKey(fs.readFileSync('../bob.private.pem').toString('hex'),'hex')

billautomata / index.html

Created December 19, 2015 01:16 — forked from max-mapper/index.html

play webm video from binary webm data

billautomata / lib.js

Last active December 11, 2015 20:54

where does this break down?

	module.exports = function a(){
	var some_variable = 'foo'
	function foo(){ console.log(some_variable) }

	return {
	foo: foo
	}
	}

	a.prototype.__proto__.bar = function(){ console.log('bar') } // the thing standard complains about

billautomata / Secure Sessions Howto

Created December 5, 2015 16:41 — forked from nikmartin/A: Secure Sessions Howto

Secure sessions with Node.js, Connect, and Nginx as an SSL Proxy

	Secure sessions are easy, but it's not very well documented, so I'm changing that.
	Here's a recipe for secure sessions in Node.js when NginX is used as an SSL proxy:

	The desired configuration for using NginX as an SSL proxy is to offload SSL processing
	and to put a hardened web server in front of your Node.js application, like:

	[NODE.JS APP] <- HTTP -> [NginX] <- HTTPS -> [CLIENT]

	To do this, here's what you need to do:

billautomata / mongo_backup.sh

Created November 3, 2015 20:43 — forked from sheharyarn/mongo_backup.sh

Mongodump Shell Script for Cronjob

	#!/bin/bash

	MONGO_DATABASE="your_db_name"
	APP_NAME="your_app_name"

	MONGO_HOST="127.0.0.1"
	MONGO_PORT="27017"
	TIMESTAMP=`date +%F-%H%M`
	MONGODUMP_PATH="/usr/bin/mongodump"
	BACKUPS_DIR="/home/username/backups/$APP_NAME"

billautomata / convert.sh

Created August 23, 2015 01:30

hd gif

	#!/bin/sh

	palette="palette.png"

	filters="fps=5,scale=720:-1:flags=lanczos"

	# ffmpeg -start_number 33736 -i G00%05d.JPG -r 3 -resize 50% output.gif

	ffmpeg -v warning -start_number 33736 -i G00%05d.JPG -vf "$filters,palettegen" -y $palette
	ffmpeg -v warning -start_number 33736 -i G00%05d.JPG -i $palette -lavfi "$filters [x]; [x][1:v] paletteuse" -y output.gif

Bill McKessy billautomata