Why you shouldn't use SHA1 to store your passwords!

sha1_breaker.rb

require 'digest/sha1'

class SHA1Breaker
  @@chars = "1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNPQRSTUVWXYZ".split("")
  @@nums = "1234567890".split("")
  @@lower = "abcdefghijklmnopqrstuvwxyz".split("")

  def self.breaker(hash)
    self.guesser(hash, @@chars)
  end

  def self.num_breaker(hash)
    self.guesser(hash, @@nums)
  end

  def self.lower_breaker(hash)
    self.guesser(hash, @@lower)
  end

  def self.guesser(hash, chars)

    start_time = Time.now

    guess_hash = ""
    count = 0

    until guess_hash == hash do
      guess = ""
      guess_hash = ""
      guess_count = count

      guess = self.build_guess(guess_count, chars)
      guess_hash = Digest::SHA1.hexdigest(guess)
      count += 1
    end

    end_time = Time.now
    puts (end_time - start_time)

    guess

  end

  def self.build_guess(count, chars)
    return "1" if count == 0
    guess = ""
    while count > 0
      guess += chars[count % chars.length]
      count /= chars.length
    end
    guess
  end
end

def get_hash(string)
  Digest::SHA1.hexdigest(string.to_s)
end