1 files changed, 110 insertions, 0 deletions
diff --git a/makepass.sh b/makepass.sh
new file mode 100755
index 0000000..7db96fd
--- /dev/null
+++ b/makepass.sh
@@ -0,0 +1,110 @@
+#!/usr/bin/env sh
+# Filename:      ~/bin/makepass.sh
+# Purpose:       Creating random passwords.
+# Authors:       Dennis Eriksen <d@ennis.no>
+# Bug-Reports:   Email <idgatt@dnns.no>
+# License:       This file is licensed under the GPL v2.
+################################################################################
+# This file takes randomness from /dev/urandom and turns it into random
+# passwords.
+#
+# This particualr script is meant to be fully POSIX compatible.
+################################################################################
+
+
+# Copyright (c) 2018-2022 Dennis Eriksen • d@ennis.no
+
+# makepass-function
+makepass() {
+  MAKEPASS_WORDLIST=${MAKEPASS_WORDLIST:-/usr/share/dict/words}
+
+  # We only take one argument
+  [ "$#" -gt 1 ] && printf '%s\n' 'only one argument' && return 1
+
+  # if $1 is not empty and is not a number
+  if [ ! -z "$1" ] && ! printf '%d' "$1" >/dev/null 2>&1; then printf '%s\n' 'not a number' && return 1; fi
+  if [ ! -z "$1" ] && [ ! ${1:-0} -gt 0 ]; then printf '%s\n' 'not a number above 0'; return 1; fi
+
+  # Go!
+  len=$1
+
+  printf '%s\n' 'Normal passwords:'
+  i=0
+  while [ $i -lt 10 ]; do
+    _random "${len:-}" '_A-Z-a-z-0-9' true
+    i=$((i + 1))
+  done | column
+  printf '\n'
+
+  printf '%s\n' 'Passwords with special characters:'
+  i=0
+  while [ $i -lt 6 ]; do
+    _random "${len:-}" '!#$%&/()=?+-_,.;:<>[]{}|\@*^A-Z-a-z-0-9' true
+    i=$((i + 1))
+  done | column
+
+  if [ -r "${MAKEPASS_WORDLIST}" ]; then
+    printf '\n'
+    printf '%s\n' 'Passphrases:'
+    lines=$(wc -l < ${MAKEPASS_WORDLIST})
+    i=0
+    while [ $i -lt 5 ]; do
+      # shuf is the best solution here, but it is very much not portable.
+      #words=$(shuf -n 8 "${MAKEPASS_WORDLIST}" | tr '\n' '-' | tr -dc '_A-Z-a-z-0-9')
+      words=""
+      j=0
+      while [ $j -lt 8 ]; do
+        words="${words}-$(sed -n $(($(_RANDOM) % $lines + 1))p "${MAKEPASS_WORDLIST}" | tr -dc '_A-Z-a-z-0-9')"
+        j=$((j + 1))
+      done
+      printf '%s\n' "${words#-}"
+      i=$((i + 1))
+    done
+  fi
+
+  unset len i lines j words
+  return 0
+}
+
+# get random number
+_RANDOM() {
+  N=0
+  while [ ! "$N" = "${N#0}" ]; do
+    N=$(head -n 100 /dev/urandom | tr -cd "[:digit:]" | tail -c 8)
+  done
+  printf '%s\n' "$N" && return 0
+}
+
+# Function to create random stuff
+_random() (
+  # sh does not like leading zeroes when doing math with numbers. Let's reset until we have a number that doesn't start with 0.
+
+  # Default is a number between 8 and 44
+  len=${1:-$(($(_RANDOM) % (44 - 8 + 1) + 8))}
+
+  # Default to [:alnum:] if no chars are specified
+  chars=${2:-'[:alnum:]'}
+
+  # First-Last-Alpha - if you want the first and the last letter to be from [:alpha:]
+  fla=${3:-'false'}
+
+  if [ "$fla" = "true" ]; then
+    if [ $len -le 2 ]; then
+      string="$(head -n 10 /dev/urandom | tr -cd '[:alpha:]' | tail -c $len)"
+    else
+      string="$(head -n 10 /dev/urandom | tr -cd '[:alpha:]' | tail -c 1)"
+      string="${string}$(head -n 100 /dev/urandom | tr -cd "$chars" | tail -c $((len-2)))"
+      string="${string}$(head -n 10 /dev/urandom | tr -cd '[:alpha:]' | tail -c 1)"
+    fi
+  else
+    string="$(head -n 100 /dev/urandom | tr -cd "$chars" | tail -c $len)"
+  fi
+
+  printf '%s\n' "$string"
+  unset len chars fla string
+  return 0
+)
+
+makepass "${@:-}"
+
+## END OF FILE #################################################################