자유

require 'digest/md5'

require 'net/http'




class BozoCrack




  def initialize(filename)

    @hashes = Array.new

    @cache = Hash.new




    File.new(filename).each_line do |line|

      if m = line.chomp.match(/\b([a-fA-F0-9]{32})\b/)

        @hashes << m[1]

      end

    end

    @hashes.uniq!

    puts "Loaded #{@hashes.count} unique hashes"




    load_cache

  end




  def crack

    @hashes.each do |hash|

      if plaintext = @cache[hash]

        puts "#{hash}:#{plaintext}"

        next

      end

      if plaintext = crack_single_hash(hash)

        puts "#{hash}:#{plaintext}"

        append_to_cache(hash, plaintext)

      end

      sleep 1

    end

  end




  private




  def crack_single_hash(hash)

    response = Net::HTTP.get URI("http://www.google.com/search?q=#{hash}")

    wordlist = response.split(/\s+/)

    if plaintext = dictionary_attack(hash, wordlist)

      return plaintext

    end

    nil

  end




  def dictionary_attack(hash, wordlist)

    wordlist.each do |word|

      if Digest::MD5.hexdigest(word) == hash.downcase

        return word

      end

    end

    nil

  end




  def load_cache(filename = "cache")

    if File.file? filename

      File.new(filename).each_line do |line|

        if m = line.chomp.match(/^([a-fA-F0-9]{32}):(.*)$/)

          @cache[m[1]] = m[2]

        end

      end

    end

  end




  def append_to_cache(hash, plaintext, filename = "cache")

    File.open(filename, "a") do |file|

      file.write "#{hash}:#{plaintext}\n"

    end

  end




end




if ARGV.size == 1

  BozoCrack.new(ARGV[0]).crack

else

  puts "Usage example: ruby bozocrack.rb file_with_md5_hashes.txt"

end