path: root/makepass.bash

#!/usr/bin/env bash
# Filename:      makepass.bash
# Purpose:       Creating random passwords.
# Authors:       Dennis Eriksen <d@ennis.no>
# Bug-Reports:   Email <git@dnns.no>
# License:       This file is licensed under the BSD 3-Clause license.
################################################################################
# This file takes randomness from /dev/urandom and turns it into random
# passwords.
################################################################################


# Copyright (c) 2018-2023 Dennis Eriksen • d@ennis.no

# makepass-function
function makepass {
  local l=$1
  local words
  local first
  local last
  MAKEPASS_WORDLIST=${MAKEPASS_WORDLIST:-/usr/share/dict/words}
  # if $l is not a number, then exit
  [[ ! $l =~ ^[0-9]+$ ]] && [[ ! "$l" == "" ]] && echo "not a number" && return 1
  (( l <= 1 || l > 255 )) && echo "Argument must be between 0 and 255" && return 1
  # if $1 is actually empty, set $l to random value for each output

  echo "Normal passwords:"
  for _ in {1..10}; do
    [ "$1" = "" ] && l=$(shuf -i 8-44 -n 1)
    head -n10 /dev/urandom | tr -dc _A-Z-a-z-0-9 | cut -c-"${1:-$l}";
  done | column
  echo ""

  echo "Passwords with special characters:"
  for _ in {1..6}; do
    [ "$1" = "" ] && l=$(shuf -i 16-64 -n 1)
    first=$(head -n10 /dev/urandom | tr -dc A-Za-z | cut -c-1)
    words=$(head -n10 /dev/urandom | tr -dc '!#$%&/()=?+-_,.;:<>[]{}|\@*^A-Z-a-z-0-9' | cut -c-"${1:-$l}")
    last=$(head  -n10 /dev/urandom | tr -dc A-Za-z | cut -c-1)
    echo "${first}${words}${last}"
  done | column

  if [ -r "${MAKEPASS_WORDLIST}" ]; then
    echo ""
    echo "Passphrases:"

    for _ in {1..5}; do
      words=$(shuf -n 8 "${MAKEPASS_WORDLIST}" | tr '\n' '-' | tr -dc '_A-Z-a-z-0-9')
      echo "${words:0:-1}"
    done;
  fi
}

makepass "${@:-}"

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