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class Crypt

  #discuz encrypt function

  def self.encrypt(txt, key)

    encrypt_key = Digest::MD5.hexdigest(rand(32000).to_s);

    ctr = 0

    tmp = ''

    Range.new(0,txt.length-1).each do |i|

      ctr = (ctr==encrypt_key.length ? 0 : ctr)

      tmp += encrypt_key[ctr].chr+(txt[i] ^ encrypt_key[ctr]).chr

      ctr = ctr+1

    end

    Base64.encode64(self.key(tmp,key));

  end





  def self.decrypt(txt,key)

    txt = self.key(Base64.decode64(txt),key)

    tmp = ''

    0.step(txt.length-1,2) do |i|

      data = txt[i] ^ txt[i+1]

      tmp += data.chr

    end

    x = self.decode(tmp)

    print x.inspect

    x

  end





  def self.key(txt, encrypt_key)

    encrypt_key = Digest::MD5.hexdigest(encrypt_key);

    ctr = 0;

    tmp = '';

    0.upto(txt.length-1) do |i|

      ctr = ctr==encrypt_key.length ? 0 : ctr

      tmp += (txt[i] ^ encrypt_key[ctr]).chr

      ctr = ctr+1

    end

    tmp

  end



  def self.encode(hash)

    raise "passport encode must recieve a hash" unless hash.instance_of? Hash

    str = []

    hash.each do |key,value|

      str << "#{key}="+CGI::escape(value.to_s)

    end

    str.join("&")

  end



  def self.decode(txt)

    txt.gsub!(/.+\?/,'')

    params = Hash.new([].freeze)

    txt.split(/[&;]/n).each do |pairs|

      key, value = pairs.split('=',2).collect{|v| CGI::unescape(v) }

      key = key.to_sym

      if params.has_key?(key)

        params[key].push(value)

      else

        params[key] = value

      end

    end

    params

  end

  #end discuz encrypt function

end