X-Git-Url: https://zdv2.bktei.com/gitweb/BK-2020-03.git/blobdiff_plain/203add48226f4fb9e6dbdde301e70daa15ab1a54..738ad68b7df736f438f74dfeffd56e400fb2c1bf:/unitproc/bknpass
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-#!/bin/bash
-# Desc: Generate passphrase with specified number of bits of entropy
-# Usage: bknpass [integer]
-# Example: bknpass 256
-# Result: 9tnzcl0m4dsm22a95525zj93jj
-# Version: 0.2.1
-# Depends: bash 5.1.8, GNU coreutils 8.32, bc 1.07.1, awk 5.1.0
-# License:
-# `bknpass`, an alphanumeric password generator
-# Copyright (C) 2022 Steven Baltakatei Sandoval (baltakatei.com)
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
-#
-# A copy of the GNU General Public License may be found at
-# .
-
-yell() { echo "$0: $*" >&2; } # print script path and all args to stderr
-die() { yell "$*"; exit 111; } # same as yell() but non-zero exit status
-try() { "$@" || die "cannot $*"; } # runs args as command, reports args if command fails
-showUsage() {
- # Desc: Display script usage information
- # Usage: showUsage
- # Version 0.0.1
- # Input: none
- # Output: stdout
- # Depends: GNU-coreutils 8.30 (cat)
- cat <<'EOF'
- USAGE:
- bknpass [int entropy_bit_count]
-
- EXAMPLE:
- bknpass 128
-EOF
-}; # Display information on how to use this script.
-main() {
- # Desc: main program
- # Usage: main "$@"
- # Input: $1: integer bits of entropy
- # Output: stdout: string passphrase
- # Depends: bash 5.1.8, GNU coreutils 8.32, bc 1.07.1, awk 5.1.0
- # Ref/Attrib: [1] "Check existence of input argument in a Bash shell script". https://stackoverflow.com/a/6482403
- # [2] "How do I test if a variable is a number in Bash?". https://stackoverflow.com/a/806923
- # [3] "Round a Number in a Bash Script". https://bits.mdminhazulhaque.io/linux/round-number-in-bash-script.html
- # [4] "Logarithms in GNU bc". https://web.archive.org/web/20210211050732/http://phodd.net/gnu-bc/bcfaq.html#bclog
- # [5] "BIP 173". Note: bech32 charset. https://github.com/bitcoin/bips/blob/master/bip-0173.mediawiki
- # [6] "Bash Function to generate random password". https://www.thegeekstuff.com/2010/04/unix-bash-function-examples/
- charset="qpzry9x8gf2tvdw0s3jn54khce6mua7l"; # bech32. See [5].
- charset="$(tr -s "$charset" < <(echo -n "$charset"))"; # remove repeat chars
- alphabet_size="$(echo -n "$charset" | wc -c)"; # number of unique chars
- log_base=2; # entropy unit base (i.e. 2 for "bits of entropy")
-
- # Check inputs
- if [[ $# -gt 1 ]]; then showUsage; die "ERROR:Too many arguments:$#"; fi;
-
- # Check for bc
- if ! command -v bc 1>/dev/null 2>&1; then die "ERROR:bc not available"; fi;
-
- ## Get entropy_bit_count
- if [[ -z "$1" ]]; then
- ### prompt user
- showUsage;
- echo -n "Please specify the required strength of the password in bits of entropy (ex: 256):" 1>&2; # prompt via stderr
- read -r entropy_bit_count
- else
- entropy_bit_count="$1";
- fi; # See [1].
-
- ## Check entropy_bit_count
- pattern="^[0-9]+$";
- if ! [[ $entropy_bit_count =~ $pattern ]] ; then die "ERROR:Not an integer:$entropy_bit_count"; fi; # See [2]
-
- ## Calculate minimum count of chars needed for passphrase as float using 'bc'
- ### Solve ln(a^n)/ln(2)=b for n where:
- ### a=$alphabet_size
- ### n=$char_count_float
- ### b=$entropy_bit_count
- char_count_float="$(echo "$entropy_bit_count*l($log_base)/l($alphabet_size)" | bc -l)"; # See [4]
-
- ## Round $char_count_float to next highest integer
- char_count="$(echo "$char_count_float" | awk '{print ($0-int($0)>0)?int($0)+1:int($0)}')"; # See [3]
-
- ## Generate and output passphrase
- echo "$(LC_ALL=C tr -cd "$charset" < /dev/urandom | head -c "$char_count")"; # See [6]
-}; # main program
-
-( main "$@" ); # run 'main()' in subshell for 'die()' portability of script as sourced bash function.
-
-#==References==
-#
-# - How to echo a string as stderr instead of stdout.
-# https://stackoverflow.com/a/2990533
-# Author: James Roth
-# Date: 2010-06-07T14:52Z
-# Date Accessed: 2020-01-20
-#
-# - How to check if script argument exists or not.
-# https://stackoverflow.com/a/6482403
-# Author: phoxix
-# Date: 2011-06-26T05:55Z
-# Date Accessed: 2020-01-20
-#
-# - How to check that a string is an integer using regular expression test.
-# https://stackoverflow.com/a/806923
-# Author: Charles Duffy
-# Date: 2009-04-30T13:32Z
-# Date Accessed: 2020-01-20
-#
-# - How to use `bc` to calculate logarithms in Bash
-# http://phodd.net/gnu-bc/bcfaq.html#bashlog
-# Author: unknown
-# Date Accessed: 2020-01-20
-#
-# - How to use `awk` to convert and round up a float to an integer.
-# https://bits.mdminhazulhaque.io/linux/round-number-in-bash-script.html
-# Author: Md. Minhazul Haque
-# Date: 2015-01-09
-# Date Accessed: 2020-01-20
-#
-# - How to use `/dev/urandom`, `tr`, and `head` to generate a random password in Bash.
-# https://www.thegeekstuff.com/2010/04/unix-bash-function-examples/
-# Author: SASIKALA, Ramesh Natarajan
-# Date: 2010-04-21
-# Date Accessed: 2020-01-20
-#
-# - Bech32 base32 charset
-# https://github.com/bitcoin/bips/blob/master/bip-0173.mediawiki
-# Author: Pieter Wuille
-# Date: 2017-03-20
-# License: BSD-2-Clause
-# Date: Accessed: 2021-01-23
-#
-# - Dependencies: bash, bc, echo, awk, tr, head
-#
-# - GNU bash, version 5.1.8(1)-release (x86_64-pc-linux-gnu)
-# Copyright (C) 2020 Free Software Foundation, Inc.
-# License GPLv3+: GNU GPL version 3 or later
-# This is free software; you are free to change and redistribute it.
-# There is NO WARRANTY, to the extent permitted by law.
-#
-# - bc 1.07.1
-# Copyright 1991-1994, 1997, 1998, 2000, 2004, 2006, 2008, 2012-2017 Free Software Foundation, Inc.
-#
-# - echo (GNU coreutils) 8.32
-# Copyright (C) 2020 Free Software Foundation, Inc.
-# License GPLv3+: GNU GPL version 3 or later .
-# This is free software: you are free to change and redistribute it.
-# There is NO WARRANTY, to the extent permitted by law.
-#
-# Written by Brian Fox and Chet Ramey.
-#
-# - GNU Awk 5.1.0, API: 3.0 (GNU MPFR 4.1.0, GNU MP 6.2.1)
-# Copyright (C) 1989, 1991-2020 Free Software Foundation.
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see http://www.gnu.org/licenses/.
-#
-# - tr (GNU coreutils) 8.32
-# Copyright (C) 2020 Free Software Foundation, Inc.
-# License GPLv3+: GNU GPL version 3 or later .
-# This is free software: you are free to change and redistribute it.
-# There is NO WARRANTY, to the extent permitted by law.
-#
-# Written by Jim Meyering.
-#
-# - head (GNU coreutils) 8.32
-# Copyright (C) 2020 Free Software Foundation, Inc.
-# License GPLv3+: GNU GPL version 3 or later .
-# This is free software: you are free to change and redistribute it.
-# There is NO WARRANTY, to the extent permitted by law.
-#
-# Written by David MacKenzie and Jim Meyering.