Brute Force Decrypter

dull_hamer_head.rb

#!/usr/bin/env ruby

require 'digest/sha1'

class UnAuth
  LIMIT = 10
  SALT = ''

  def initialize(encrypted_password)
    @digits = [*('0'..'9'), *('a'..'z'), *('A'..'Z')]
    @encrypted_password = encrypted_password
  end

  def crack(password)
    return password if  @encrypted_password == encrypt(password)

    map_digits(password).each do |text|
      if password.size < LIMIT
        password = "#{text}"
        crack(password)
        puts password
      end
    end

    password
  end


  def map_digits(sufix)
    @digits.map do |d|
      "#{d}#{sufix}"
    end
  end

  def encrypt(text, salt = '')
    Digest::SHA1::hexdigest("#{salt}--#{text}--")
  end
end


if ARGV.size == 1
  app = UnAuth.new(ARGV[0])
  app.crack('')
else
  puts "Usage example: ruby unauth.rb encrypted_password"
end