Skip the sleep; rely on /dev/random to block.

[overonion] / overonion-make-key

#!/bin/bash

ciphers=(
  bf-cbc bf-cfb bf-ecb bf-ofb
  cast-cbc cast5-cbc cast5-cfb cast5-ecb cast5-ofb
  des-cbc des-cfb des-ofb des-ecb
  des-ede-cbc des-ede des-ede-cfb des-ede-ofb
  des-ede3-cbc des-ede3 des-ede3-cfb des-ede3-ofb
  idea-cbc idea-cfb idea-ecb idea-ofb
  rc2-cbc rc2-cfb rc2-ecb rc2-ofb rc2-64-cbc rc2-40-cbc
  rc4 rc4-40
  rc5-cbc rc5-cfb rc5-ecb rc5-ofb
  aes-128-cbc aes-128-cfb aes-128-cfb1 aes-128-cfb8 aes-128-ecb aes-128-ofb
  aes-192-cbc aes-192-cfb aes-192-cfb1 aes-192-cfb8 aes-192-ecb aes-192-ofb
  aes-256-cbc aes-256-cfb aes-256-cfb1 aes-256-cfb8 aes-256-ecb aes-256-ofb
)

umask 077

if (( $# != 1));then
  echo "usage: overonion-make-key keyfile"
  exit 1
fi
keyfile=$1
if [[ -e "$keyfile" ]];then
  echo "That keyfile already exists.  I refuse to overwrite it."
  exit 1
fi

i=0
while read -r cipher;do
  echo -n $'\r'"Generating key $((++i))/${#ciphers[*]}"
  cat >> "$keyfile" <<< "$cipher $(head -c 99 /dev/random | base64 --wrap=0 )"
done < <( IFS=$'\n'; shuf <<< "${ciphers[*]}"; )
echo