First draft

Author: wapcaplet

.gitignore

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+.rvmrc

Gemfile

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+source :rubygems
+
+gem 'bundler', '~> 1.0'
+
+gemspec

Gemfile.lock

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+PATH
+  remote: .
+  specs:
+    spass (0.0.1)
+
+GEM
+  remote: http://rubygems.org/
+  specs:
+    diff-lcs (1.1.3)
+    rcov (0.9.11)
+    rspec (2.7.0)
+      rspec-core (~> 2.7.0)
+      rspec-expectations (~> 2.7.0)
+      rspec-mocks (~> 2.7.0)
+    rspec-core (2.7.1)
+    rspec-expectations (2.7.0)
+      diff-lcs (~> 1.1.2)
+    rspec-mocks (2.7.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  bundler (~> 1.0)
+  rcov
+  rspec (>= 2.2.0)
+  spass!

bin/spass

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+#!/usr/bin/env ruby
+
+require 'spass' # Is this needed?
+
+USAGE = <<EOF
+makepass.rb: Generate a passphrase with lowercase words
+
+Usage:
+
+  $ makepass.rb <length>
+
+This script generates a plain-English passphrase of at least the given length
+(in characters), using random words from /usr/share/dict/words. Only lowercase
+letters a-z will be included in the output, making passphrases relatively easy
+to type (though usually nonsensical).
+
+Examples:
+
+  $ ./makepass.rb 12
+  hive frighten
+
+  $ ./makepass.rb 24
+  moppet castigator harvesters
+
+  $ ./makepass.rb 32
+  munificent icebound raymond clorets
+
+A 32-character passphrase has about 120 bits of entropy, which is overkill for
+most purposes. A 24-character passphrase clocks in at about 90 bits of entropy,
+suitable for most high-security applications like root passwords or financial
+records. You might want to use a password checker to verify the strength of
+your passphrase after generating one that you like:
+
+  http://rumkin.com/tools/password/passchk.php
+
+Inspired by http://xkcd.com/936/
+EOF
+
+if ARGV.count == 0
+  puts USAGE
+else
+  length = ARGV[0].to_i
+  puts SPass::generate(length)
+end
+
+

lib/spass.rb

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+DICT_PATH = '/usr/share/dict/words'
+DICT_LINES = `wc -l #{DICT_PATH}`.split.first.to_i
+
+class SPass
+  # Return a random word from the dictionary, lowercased
+  def self.random_word
+    %x[sed -n '#{rand(DICT_LINES)} {p;q;}' '#{DICT_PATH}'].chomp.downcase
+  end
+
+  # Return a random word that consists of only lowercase letters
+  def self.random_ascii_word
+    word = random_word
+    while word =~ /[^a-z]/
+      word = random_word
+    end
+    return word
+  end
+
+  # Generate a passphrase of at least the given length in characters
+  def self.generate(length)
+    phrase = ''
+    while phrase.length < length
+      phrase += random_ascii_word + ' '
+    end
+    return phrase.chomp
+  end
+end
+

spass.gemspec

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+Gem::Specification.new do |s|
+  s.name = "spass"
+  s.version = "0.0.1"
+  s.summary = "Generate passphrases"
+  s.description = <<-EOS
+    spass generates passphrases using random words
+  EOS
+  s.authors = ["Eric Pierce"]
+  s.email = "[email protected]"
+  s.homepage = "http://github.com/wapcaplet/spass"
+  s.platform = Gem::Platform::RUBY
+
+  s.add_development_dependency 'rspec', '>= 2.2.0'
+  s.add_development_dependency 'rcov'
+  #s.add_development_dependency 'yard'
+  #s.add_development_dependency 'bluecloth'
+
+  s.files = `git ls-files`.split("\n")
+  s.require_path = 'lib'
+
+  s.executables = ['spass']
+end
+