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"
]

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(min_entropy: 18, entropy_threshhold: 0) ⇒ QwertyAdjuster

Returns a new instance of QwertyAdjuster.



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

def initialize(min_entropy: 18, entropy_threshhold: 0)
  @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
  min_entropy = [EntropyCalculator.calculate(base_password), EntropyCalculator.calculate(revpassword)].min
  qpassword = mask_qwerty_strings(base_password)
  qrevpassword = mask_qwerty_strings(revpassword)
  if qpassword != base_password
    numbits = EntropyCalculator.calculate(qpassword)
    min_entropy = [min_entropy, numbits].min
    return min_entropy if min_entropy < entropy_threshhold
  end
  if qrevpassword != revpassword
    numbits = EntropyCalculator.calculate(qrevpassword)
    min_entropy = [min_entropy, numbits].min
    return min_entropy if min_entropy < entropy_threshhold
  end
  min_entropy
end

#is_strong?(base_password) ⇒ Boolean

Returns:

  • (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

Returns:

  • (Boolean) 


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

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