56 lines
1.5 KiB
Bash
56 lines
1.5 KiB
Bash
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#!/usr/bin/env bash
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print_help() {
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cat <<HELP
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Generate a random password from /dev/urandom, with characters from /[A-z0-9;-]/
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Usage: $(basename "$0") <output-length>
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Examples:
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$(basename "$0") 20 | wl-copy
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$(basename "$0") 400 > key_file
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Special characters: /[;-]/
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Length must be at least $MIN_PASSWORD_LENGTH. Passwords are generated until one of each a
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lowercase, uppercase, digit, and special character are in the password.
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Both special characters are required for passwords >=$LONG_PASSWORD_LENGTH characters long.
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Really long passwords have at least 2 of each special character.
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HELP
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}
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shopt -s lastpipe
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declare -ri LONG_PASSWORD_LENGTH=15 MIN_PASSWORD_LENGTH=6
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declare -gri LENGTH="$1"
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declare password=""
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generate_password() {
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dd if=/dev/urandom bs=3 count="$(( 10 * LENGTH ))" 2>/dev/null \
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| base64 -w0 \
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| tr '/' '-' \
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| tr '+' ';' \
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| cut -c "1-$LENGTH" \
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| read -r password
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}
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contains_characterset() {
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local p="$password"
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if [[ $LENGTH -ge $(( 2*LONG_PASSWORD_LENGTH )) ]]; then
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[[ $p =~ [A-Z] && $p =~ [a-z] && $p =~ [0-9] && $p =~ \;.+\; && $p =~ -.+- ]]
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elif [[ $LENGTH -ge $LONG_PASSWORD_LENGTH ]]; then
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[[ $p =~ [A-Z] && $p =~ [a-z] && $p =~ [0-9] && $p =~ \; && $p =~ - ]]
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else
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[[ $p =~ [A-Z] && $p =~ [a-z] && $p =~ [0-9] ]] && [[ $p =~ \; || $p =~ - ]]
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fi
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}
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if [[ "$1" =~ ^[0-9]+$ && $1 -ge $MIN_PASSWORD_LENGTH ]]; then
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while ! contains_characterset; do
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generate_password "$1"
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done
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echo "$password"
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else
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print_help
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exit 1
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fi
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