blob: c1b14aa4d65859e2ea92687b0bba596be5da1ddb (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
#! /bin/ksh
# Copyright (c) 2021 Stefan Kreutz <mail@skreutz.com>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
set -o errexit
set -o nounset
set -o pipefail
alphabet=23456789abcdefghijmopqrstwxyzABCDEFGHJKLMNPQRSTUVWXYZ
groups=12
width=4
separator=-
verbosity=0
while getopts :va:g:w:s: option; do
case "$option" in
v) verbosity=$((verbosity+1)) ;;
a) alphabet="$OPTARG" ;;
g) groups="$OPTARG" ;;
w) width="$OPTARG" ;;
s) separator="$OPTARG" ;;
:) print -u2 -- "missing argument for option -$OPTARG"; exit 1 ;;
?) print -u2 -- "illegal option: -$OPTARG"; exit 1 ;;
esac
done
shift $((OPTIND-1))
# shellcheck disable=SC2046
set -A symbol -- $( echo "$alphabet" | fold -w 1 | sort -u | tr -d '\n' | sed 's/./& /g' )
# shellcheck disable=SC2154
symbols=${#symbol[*]}
jot -r $((groups*width)) 0 $((symbols-1)) |
while IFS= read -r i; do echo "${symbol[$i]}"; done |
tr -d '\n' |
fold -w "$width" |
paste -s -d "$separator" -
if [ $verbosity -gt 0 ]; then
entropy="$( printf 'e = (%d * %d * l(%d))/l(2); scale = 0; e/1\n' "$groups" "$width" "$symbols" | bc -l )"
print -u2 -- "The generated password has an entropy of ${entropy} bits."
fi
|