Class: PinDrop::Cracker

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

Class Method Summary collapse

Class Method Details

.crack_pin(pin) ⇒ Object 



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# File 'lib/pin_drop.rb', line 5

def self.crack_pin(pin)
  # http://www.datagenetics.com/blog/september32012/
  guesses = self.guesses

  i = 0
  until guesses.empty?
    guess = guesses.shift
    i += 1
    if guess == pin.to_s
      puts "took #{i} guesses to guess #{pin}"
      return i
    end
  end
end

.guesses ⇒ Object 



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# File 'lib/pin_drop.rb', line 20

def self.guesses
  obvious = [1234,1111,0000,1212,7777,1004,2000,4444,2222,6969,9999,3333,5555,6666,1122,1313,8888,4321,2001,1010].map(&:to_s)
  singlets = []
  couplets = []
  nineties = []
  twothousands = []
  starts_with_1 = []
  starts_with_0 = []
  ddmm_date = []
  mmdd_date = []
  mmyy_date = []
  starts_with_2 = []
  starts_with_3 = []
  starts_with_4 = []
  starts_with_5 = []
  starts_with_7 = []
  starts_with_6 = []
  starts_with_8 = []
  starts_with_9 = []
  the_rest = []

  (0..9999).each do |i|
    str = i.to_s.rjust(4, '0')

    if obvious.include? str
      # already there
    elsif str[0] == '1' && str[1] == '9'
      nineties << str
    elsif str[0] == '2' && str[1] == '0' && (str[2] == '1' || str[2] == '0')
      twothousands << str
    elsif str.chars.uniq.length === 1
      singlets << str
    elsif str[0] == str[2] && str[1] == str[3]
      couplets << str
    elsif str[0] == '1'
      starts_with_1 << str
    elsif str[0] == '0'
      starts_with_0 << str
    elsif str[0..1].to_i <= 31 && str[2..3].to_i <= 12
      ddmm_date << str
    elsif str[0..1].to_i <= 12 && str[2..3].to_i <= 31
      mmdd_date << str
    elsif str[0..1].to_i <= 12
      mmyy_date << str
    elsif str[0] == '2'
      starts_with_2 << str
    elsif str[0] == '3'
      starts_with_3 << str
    elsif str[0] == '4'
      starts_with_4 << str
    elsif str[0] == '5'
      starts_with_5 << str
    elsif str[0] == '7'
      starts_with_7 << str
    elsif str[0] == '6'
      starts_with_6 << str
    elsif str[0] == '8'
      starts_with_8 << str
    elsif str[0] == '9'
      starts_with_9 << str
    else
      the_rest << str
    end
  end

  obvious + singlets + couplets + nineties + twothousands + starts_with_1 + starts_with_0 + ddmm_date + mmdd_date + mmyy_date + starts_with_2 + starts_with_3 + starts_with_4 + starts_with_5 + starts_with_7 + starts_with_6 + starts_with_8 + starts_with_9 + the_rest
end