Class: CipherBureau::PasswordMeter

Inherits:
Object
  • Object
show all
Defined in:
lib/cipher_bureau/password_meter.rb

Overview

Copyright © 2013 Dynamic Project Management AS Copyright © 2013 Knut I. Stenmark

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Constant Summary collapse

LETTERS = 
('a'..'z').to_a.join
NUMBERS = 
(0..9).to_a.join
SYMBOLS = 
')!@#$%^&*()'

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(password) ⇒ PasswordMeter

Returns a new instance of PasswordMeter.



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# File 'lib/cipher_bureau/password_meter.rb', line 29

def initialize(password)
  self.password = password
end

Instance Attribute Details

#length ⇒ Object (readonly)

Returns the value of attribute length.



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# File 'lib/cipher_bureau/password_meter.rb', line 28

def length
  @length
end

#password ⇒ Object

Returns the value of attribute password.



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# File 'lib/cipher_bureau/password_meter.rb', line 28

def password
  @password
end

Class Method Details

.strength(password) ⇒ Object 



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# File 'lib/cipher_bureau/password_meter.rb', line 39

def self.strength(password)
  new(password).strength
end

Instance Method Details

#absolute_score ⇒ Object 



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# File 'lib/cipher_bureau/password_meter.rb', line 59

def absolute_score
  #@absolute_score ||= 
  additions - deductions
end

#additions ⇒ Object 



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# File 'lib/cipher_bureau/password_meter.rb', line 64

def additions
  number_of_characters + uppercase_letters + lowercase_letters + numbers + symbols + middle_numbers_or_symbols + requirements
end

#consecutive(pattern) ⇒ Object 



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# File 'lib/cipher_bureau/password_meter.rb', line 172

def consecutive(pattern)
  n = 0
  prev = nil
  password.chars do |c|
    m = c.match(pattern)
    n += 1 if m && prev
    prev = m
  end
  n * 2
end

#consecutive_lowercase ⇒ Object 



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# File 'lib/cipher_bureau/password_meter.rb', line 164

def consecutive_lowercase
  consecutive /[a-z]/
end

#consecutive_numbers ⇒ Object 



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# File 'lib/cipher_bureau/password_meter.rb', line 168

def consecutive_numbers
  consecutive /[0-9]/
end

#consecutive_uppercase ⇒ Object 



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# File 'lib/cipher_bureau/password_meter.rb', line 160

def consecutive_uppercase
  consecutive /[A-Z]/
end

#deductions ⇒ Object 



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# File 'lib/cipher_bureau/password_meter.rb', line 68

def deductions
  letters_only + numbers_only + repeated_characters + 
    sequential_letters + sequential_numbers + sequential_symbols +
    consecutive_uppercase + consecutive_lowercase + consecutive_numbers
end

#letters_only ⇒ Object

Deductions



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# File 'lib/cipher_bureau/password_meter.rb', line 110

def letters_only
  n = password.gsub(/[^a-zA-Z]/, '\1').length
  n == length ? n : 0
end

#lowercase_letters ⇒ Object 



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# File 'lib/cipher_bureau/password_meter.rb', line 82

def lowercase_letters
  n = password.gsub(/[^a-z]/, '\1').length
  n > 0 ? (length - n) * 2 : 0
end

#middle_numbers_or_symbols ⇒ Object 



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# File 'lib/cipher_bureau/password_meter.rb', line 93

def middle_numbers_or_symbols
  length < 3 ? 0 : password[1...-1].gsub(/[a-zA-Z]/, '\1').length * 2
end

#number_of_characters ⇒ Object

Additions



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# File 'lib/cipher_bureau/password_meter.rb', line 75

def number_of_characters
  password.length * 4
end

#numbers ⇒ Object 



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# File 'lib/cipher_bureau/password_meter.rb', line 86

def numbers
  n = password.gsub(/[^0-9]/, '\1').length
  n < length ? n * 4 : 0
end

#numbers_only ⇒ Object 



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# File 'lib/cipher_bureau/password_meter.rb', line 115

def numbers_only
  n = password.gsub(/[^0-9]/, '\1').length
  n == length ? n : 0
end

#repeated_characters ⇒ Object 



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# File 'lib/cipher_bureau/password_meter.rb', line 120

def repeated_characters
  nc = ni = 0
  length.times do |a|
    ch_exists = false
    length.times do |b|
      if a != b && password[a] == password[b]
        ch_exists = true
        ni += (length.to_f / (b - a)).abs
      end
    end
    if ch_exists
      nc += 1
      unique = length - nc;
      ni = unique != 0 ? (ni/unique).ceil : ni.ceil
    end
  end
  ni
end

#requirements ⇒ Object 



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# File 'lib/cipher_bureau/password_meter.rb', line 96

def requirements
  if length >= 8
    numbers = password.gsub(/[^0-9]/, '\1').length > 0 ? 1 : 0
    lowercase = password.gsub(/[^a-z]/, '\1').length > 0 ? 1 : 0
    uppercase = password.gsub(/[^A-Z]/, '\1').length > 0 ? 1 : 0
    symbols = password.gsub(/[a-zA-Z0-9_]/, '\1').length > 0 ? 1 : 0
    n = (numbers + lowercase + uppercase + symbols)
    n > 2 ? (n + 1) * 2 : 0 # add 2 for satisfying length
  else
    0
  end
end

#sequential(str, p = password) ⇒ Object 



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# File 'lib/cipher_bureau/password_meter.rb', line 151

def sequential(str, p = password)
  n = 0
  (str.size - 3).times do |i|
    s = str[i..i + 2]
    n += 1 if p.include?( s) || p.include?( s.reverse) 
  end
  n * 3
end

#sequential_letters ⇒ Object 



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# File 'lib/cipher_bureau/password_meter.rb', line 139

def sequential_letters
  sequential LETTERS, password.downcase
end

#sequential_numbers ⇒ Object 



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# File 'lib/cipher_bureau/password_meter.rb', line 143

def sequential_numbers
  sequential NUMBERS
end

#sequential_symbols ⇒ Object 



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# File 'lib/cipher_bureau/password_meter.rb', line 147

def sequential_symbols
  sequential SYMBOLS
end

#strength ⇒ Object 



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# File 'lib/cipher_bureau/password_meter.rb', line 43

def strength
  n = absolute_score  
  n > 100 ? 100 : (n < 0 ? 0 : n )
end

#symbols ⇒ Object 



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# File 'lib/cipher_bureau/password_meter.rb', line 90

def symbols
  password.gsub(/[a-zA-Z0-9_]/, '\1').length * 6
end

#uppercase_letters ⇒ Object 



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# File 'lib/cipher_bureau/password_meter.rb', line 78

def uppercase_letters
  n = password.gsub(/[^A-Z]/, '\1').length
  n > 0 ? (length - n) * 2 : 0
end

#verbose_strength ⇒ Object 



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# File 'lib/cipher_bureau/password_meter.rb', line 48

def verbose_strength
  case strength
  when 0...20   then "Very Weak"
  when 20...40  then "Weak"
  when 40...60  then "Good"
  when 60...80  then "Strong"
  else
    "Very Strong"
  end
end