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619097cc2a
"shuf" is not a standard command on MacOS and requires installation of the brew coreutils package
101 lines
3.5 KiB
Bash
101 lines
3.5 KiB
Bash
autoload -U regexp-replace
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zmodload zsh/mathfunc
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genpass-apple() {
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# Generates a 128-bit password of 6 pseudowords of 6 characters each
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# EG, xudmec-4ambyj-tavric-mumpub-mydVop-bypjyp
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# Can take a numerical argument for generating extra passwords
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local -i i j num
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[[ $1 =~ '^[0-9]+$' ]] && num=$1 || num=1
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local consonants="$(LC_ALL=C tr -cd b-df-hj-np-tv-xz < /dev/urandom \
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| head -c $((24*$num)))"
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local vowels="$(LC_ALL=C tr -cd aeiouy < /dev/urandom | head -c $((12*$num)))"
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local digits="$(LC_ALL=C tr -cd 0-9 < /dev/urandom | head -c $num)"
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# The digit is placed on a pseudoword edge using $base36. IE, Dvccvc or cvccvD
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local position="$(LC_ALL=C tr -cd 056bchinotuz < /dev/urandom | head -c $num)"
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local -A base36=(0 0 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 a 10 b 11 c 12 d 13 \
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e 14 f 15 g 16 h 17 i 18 j 19 k 20 l 21 m 22 n 23 o 24 p 25 q 26 r 27 s 28 \
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t 29 u 30 v 31 w 32 x 33 y 34 z 35)
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for i in {1..$num}; do
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local pseudo=""
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for j in {1..12}; do
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# Uniformly iterate through $consonants and $vowels for each $i and $j
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# Creates cvccvccvccvccvccvccvccvccvccvccvccvc for each $num
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pseudo="${pseudo}${consonants:$((24*$i+2*${j}-26)):1}"
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pseudo="${pseudo}${vowels:$((12*$i+${j}-13)):1}"
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pseudo="${pseudo}${consonants:$((24*$i+2*${j}-25)):1}"
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done
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local -i digit_pos=${base36[${position[$i]}]}
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local -i char_pos=$digit_pos
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# The digit and uppercase character must be in different locations
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while [[ $digit_pos == $char_pos ]]; do
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char_pos=$base36[$(LC_ALL=C tr -cd 0-9a-z < /dev/urandom | head -c 1)]
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done
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# Places the digit on a pseudoword edge
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regexp-replace pseudo "^(.{$digit_pos}).(.*)$" \
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'${match[1]}${digits[$i]}${match[2]}'
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# Uppercase a random character (that is not a digit)
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regexp-replace pseudo "^(.{$char_pos})(.)(.*)$" \
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'${match[1]}${(U)match[2]}${match[3]}'
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# Hyphenate each 6-character pseudoword
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regexp-replace pseudo '^(.{6})(.{6})(.{6})(.{6})(.{6})(.{6})$' \
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'${match[1]}-${match[2]}-${match[3]}-${match[4]}-${match[5]}-${match[6]}'
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printf "${pseudo}\n"
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done
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}
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genpass-monkey() {
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# Generates a 128-bit base32 password as if monkeys banged the keyboard
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# EG, nz5ej2kypkvcw0rn5cvhs6qxtm
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# Can take a numerical argument for generating extra passwords
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local -i i num
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[[ $1 =~ '^[0-9]+$' ]] && num=$1 || num=1
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local pass=$(LC_ALL=C tr -cd '0-9a-hjkmnp-tv-z' < /dev/urandom \
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| head -c $((26*$num)))
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for i in {1..$num}; do
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printf "${pass:$((26*($i-1))):26}\n"
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done
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}
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genpass-xkcd() {
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# Generates a 128-bit XKCD-style passphrase
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# EG, 9-mien-flood-Patti-buxom-dozes-ickier-pay-ailed-Foster
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# Can take a numerical argument for generating extra passwords
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if (( ! $+commands[shuf] )); then
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echo >&2 "$0: \`shuf\` command not found. Install coreutils (\`brew install coreutils\` on macOS)."
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return 1
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fi
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local -i i num
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[[ $1 =~ '^[0-9]+$' ]] && num=$1 || num=1
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# Get all alphabetic words of at most 6 characters in length
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local dict=$(LC_ALL=C grep -E '^[a-zA-Z]{1,6}$' /usr/share/dict/words)
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# Calculate the base-2 entropy of each word in $dict
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# Entropy is e = L * log2(C), where L is the length of the password (here,
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# in words) and C the size of the character set (here, words in $dict).
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# Solve for e = 128 bits of entropy. Recall: log2(n) = log(n)/log(2).
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local -i n=$((int(ceil(128*log(2)/log(${(w)#dict})))))
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for i in {1..$num}; do
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printf "$n-"
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printf "$dict" | shuf -n "$n" | paste -sd '-'
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done
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}
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