arobb

# From  
# https://sites.google.com/site/astudyofentropy/project-definition/raspberry-pi-internal-hardware-random-number-generator  
# http://scruss.com/blog/2013/06/07/well-that-was-unexpected-the-raspberry-pis-hardware-random-number-generator/  

# Install the kernel module for the hardware RNG  
# After this command, random data is available from /dev/hwrng  
sudo modprobe bcm2708-rng

# Make sure it's activated each boot  
# Add this to /etc/modules  

arobb

#
# Access ZFS array on Mac without Open ZFS on OS X (O3X)
#
# Origin: O3X crashing computer, and drive array could not be attached 
#   as a complete set (as a USB device) to a VM. Used only as recovery
#   mechanism to extract data from the ZFS array. ZFS is not fully
#   supported on Ubuntu 15 (should be baked into 16).
#
# Requires raw access to the disks: directly attach as USB device
#   or (as in this description) disks are accessed as raw devices

arobb

# Machine with internet access
virtualenv -p $(which python2.7) venv
source venv/bin/activate
mkdir pip-sources
pip download --no-binary ./pip-sources <package1>
pip download --no-binary ./pip-sources <package2>
pip install --no-index --find-links=./pip-sources <package1> <package2>
pip freeze > pip_requirements.txt
tar czf required-packages.tar.gz pip_requirements.txt ./pip-sources

arobb

# ip utility (OS X)
git clone git@github.com:brona/iproute2mac.git
sudo cp iproute2mac/src/ip.py /usr/local/bin/ip
sudo chown root:wheel /usr/local/bin/ip

# LZO headers (OS X)
http://www.oberhumer.com/opensource/lzo/#download
~/Download/lzo-2.09/src
./configure
make

arobb

Encrypt: gpg --armor --output <out enc file> --symmetric --cipher-algo AES256 <in clear file>
Decrypt: gpg --output <out clear file> --decrypt <in clear file>

arobb

#!/bin/bash
# Decrypt GPG files in current directory
# Files created with gpg --armor --output <out enc file> --symmetric --cipher-algo AES256 <in clear file>

read -s -p "Enter Password: " pw
echo -ne "\033[0K\r"

for infile in *.gpg;
do
  outfile=${infile%.gpg}

arobb

apt-get install bc
git clone https://github.com/openssl/openssl.git
git checkout OpenSSL_1_0_2-stable
./config enable-egd zlib threads no-ssl2 no-ssl3 no-weak-ssl-ciphers
make depend
make
make test

arobb

# OpenVPN Configuration
# Multiple files will start independent daemons

# Basic options
## Logging
log-append /var/log/openvpn.log
verb 3

## Listen port
dev tun

arobb

# IP and new hostname of PI
PI_IP=""
PI_NEW_HOSTNAME=""

# Set ssh keys, use default password
cat ~/.ssh/id_rsa.pub | ssh pi@"$PI_IP" 'cat >> .ssh/authorized_keys'

# Connect to the pi
ssh pi@"$PI_IP"

arobb

#!/usr/bin/env bash
vcgencmd measure_temp | sed -n 's/temp=\([0-9.]*\).*$/\1/p' | bc <<< "9 / 5 * `cat` + 32"