Class: StrongPassword::QwertyAdjuster

Inherits:
Object
  • Object
show all
Defined in:
lib/strong_password/qwerty_adjuster.rb

Constant Summary collapse

QWERTY_STRINGS = 
[
  '1234567890-',
  'qwertyuiop',
  'asdfghjkl;',
  'zxcvbnm,./',
  "1qaz2wsx3edc4rfv5tgb6yhn7ujm8ik,9ol.0p;/-['=]:?_{\"+}",
  '1qaz2wsx3edc4rfv5tgb6yhn7ujm8ik9ol0p',
  "qazwsxedcrfvtgbyhnujmik,ol.p;/-['=]:?_{\"+}",
  'qazwsxedcrfvtgbyhnujmikolp',
  ']"/=[;.-pl,0okm9ijn8uhb7ygv6tfc5rdx4esz3wa2q1',
  'pl0okm9ijn8uhb7ygv6tfc5rdx4esz3wa2q1',
  ']"/[;.pl,okmijnuhbygvtfcrdxeszwaq',
  'plokmijnuhbygvtfcrdxeszwaq',
  '014725836914702583697894561230258/369*+-*/',
  'abcdefghijklmnopqrstuvwxyz'
].freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(min_entropy: 18, entropy_threshhold: min_entropy) ⇒ QwertyAdjuster 



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# File 'lib/strong_password/qwerty_adjuster.rb', line 22

def initialize(min_entropy: 18, entropy_threshhold: min_entropy)
  @min_entropy = min_entropy
  @entropy_threshhold = entropy_threshhold
end

Instance Attribute Details

#entropy_threshhold ⇒ Object (readonly)

Returns the value of attribute entropy_threshhold.



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# File 'lib/strong_password/qwerty_adjuster.rb', line 20

def entropy_threshhold
  @entropy_threshhold
end

#min_entropy ⇒ Object (readonly)

Returns the value of attribute min_entropy.



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# File 'lib/strong_password/qwerty_adjuster.rb', line 20

def min_entropy
  @min_entropy
end

Instance Method Details

#adjusted_entropy(base_password) ⇒ Object

Returns the minimum entropy for the password’s qwerty locality adjustments. If a threshhold is specified we will bail early to avoid unnecessary processing.



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# File 'lib/strong_password/qwerty_adjuster.rb', line 38

def adjusted_entropy(base_password)
  revpassword = base_password.reverse
  lowest_entropy = [EntropyCalculator.calculate(base_password), EntropyCalculator.calculate(revpassword)].min
  # If our entropy is already lower than we care about then there's no reason to look further.
  return lowest_entropy if lowest_entropy < entropy_threshhold

  qpassword = mask_qwerty_strings(base_password)
  lowest_entropy = [lowest_entropy, EntropyCalculator.calculate(qpassword)].min if qpassword != base_password
  # Bail early if our entropy on the base password's masked qwerty value is less than our threshold.
  return lowest_entropy if lowest_entropy < entropy_threshhold

  qrevpassword = mask_qwerty_strings(revpassword)
  lowest_entropy = [lowest_entropy, EntropyCalculator.calculate(qrevpassword)].min if qrevpassword != revpassword
  lowest_entropy
end

#is_strong?(base_password) ⇒ Boolean 



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# File 'lib/strong_password/qwerty_adjuster.rb', line 27

def is_strong?(base_password)
  adjusted_entropy(base_password) >= min_entropy
end

#is_weak?(base_password) ⇒ Boolean 



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# File 'lib/strong_password/qwerty_adjuster.rb', line 31

def is_weak?(base_password)
  !is_strong?(base_password)
end