Created
May 13, 2022 20:41
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Ruby dropped-key generator, for when your broken keyboard loses 1+ keys while typing a password
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#!/usr/bin/env ruby | |
# | |
BASEWORD = ARGV[0] || raise("No baseword specified") | |
base_chars = BASEWORD.split('') | |
rv = [] | |
(1..(base_chars.length - 1)).each do |permutation_len| | |
possible = base_chars.permutation(permutation_len).to_a | |
filtered = possible.find_all do |chars| | |
# A word is legal if it doesn't violate the ordering of the original letters, e.g. | |
# BASEWORD: foobar OK: oobar oob ooba NOT: rab roo abf | |
if chars.length == 1 | |
true | |
else | |
# For every character being tested, we should be able to find it as we scan along | |
# the baseword, starting at the position of the character in the set we're testing. | |
# E.g. BASE: foobar TEST: fbr - we want to find 'f' at position 0, 'b' at position 1 or later, | |
# and 'r' at position 2 or later | |
legal = true | |
last_pos = 0 | |
chars.each_with_index do |c, idx| | |
#puts "testing: #{c} from #{chars.join('')}" | |
pos = base_chars[0..-1].index(c) | |
if pos.nil? | |
legal = false | |
break | |
elsif pos < last_pos | |
legal = false | |
break | |
else | |
last_pos = pos | |
end | |
end | |
#puts "legal: #{legal} - #{chars.join('')}" | |
legal | |
end | |
end | |
rv += filtered.collect{|chars| chars.join('')} | |
end | |
rv << BASEWORD | |
puts rv.join("\n") |
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