array code

This code was used to demonstrate how to translate easy to remember simple (weak) passwords into more difficult to guess (strong) passwords. Example: Using Gmail I like an easy to remember password, I submit the password 'jr123' to the password_lookup.html page and what's returned to me is a stronger password 'NCC2SI1T'.

file: passwd_lookup.rb (generates an xml file containing an alphanumeric index with corresponding cryptic values)

class PasswordLookup

  def initialize()
    chars =  (0..9).to_a  + Array.new(7) + ('A'..'Z').to_a + Array.new(6) + ('a'..'z').to_a 
    @chars = (0..9).to_a  + ('A'..'Z').to_a + ('a'..'z').to_a 
    @doc = Document.new()
    root = Element.new('codes')
    @doc.add_element(root)

    chars.each do |char|
      node = Element.new('code')
      if not char.nil? 
        node.attributes['index'] = char
        node.attributes['value'] = get_random_chars(2)
      end
      root.add_element(node)
    end
    puts root
  end

  
  def save(filepath)
    file = File.new(filepath,'w')
    file.puts @doc
    file.close
  end
        
  def get_random_chars(vword_size)
    newpass = Array.new(rand(vword_size) + 1, '').collect{@chars[rand(@chars.size)]}.join
    # return the encryption providing it doesn't already exist in the lookup table.
    if not /value=\'#{newpass}\'/.match @doc.root.elements.to_a.to_s 
     return newpass 
    else
     return get_random_chars(vword_size) 
    end

  end
  
  private :get_random_chars
  
end

output extract: (codes - see also http://rorbuilder.info/pl/codes)

<codes>
<code value='4h' index='a'/><code value='B' index='b'/><code value='m' index='c'/>
<code value='qf' index='d'/>
</codes>

file: password_lookup.js

var t;
var m_doc;

function loadXml() {
  url = 'http://rorbuilder.info/pl/codes';
  m_doc = XML.load(url);
}

function getCode(val,i) {
  pos = val.charCodeAt(i) - 48;
  node = m_doc.documentElement.childNodes[pos]
  return node.getAttribute('value');
}

function timed_update(keyCode,  val) {
  if (val.length > 0 && ((keyCode > 40) || (keyCode == 8)) ) {
    clearTimeout(t);
    t = setTimeout("revealCode('" + val + "')", 1000);
  }
  else
  {  
    o = document.getElementById('out1');
    if (val.length <= 0 && o.value.length > 0) {
      o.value = '';
    }
  }
  
}

function revealCode(val) {
  var iEnd = val.length;
  var newcode = '';
  for (i=0;i<iEnd;i++) {
      
    var codex = getCode(val,i);
    newcode += codex;
  }
  update(newcode);
}

function update(val){
  o = document.getElementById('out1');
  o.value = val;
  /*var o_copied = document.getElementById('out1').createTextRange();
  o_copied.exeCommand("Copy");*/
}

file: password_lookup.html

  <body onload="loadXml()">
    <h1>Password lookup</h1>
    <dl>
    <dt><label for="in1">Enter password:</label></dt>    
    <dd><input type="text" name="in1" id="in1" value="" 
  onkeyup="timed_update(event.keyCode, this.value)" /></dd>
    
    <dt><label for="out1">Generated password</label></dt>
    <dd><input type="text" name="out1" id="out1" value=""/></dd>
    <dd><input type="button" name="clear1" id="clear1" onclick="clearPassword()" value="clear"/></dd>

    </dl>
    <p>see also: <a href="codes.xml" title="password code lookup table">codes.xml</a></p>
  </body>

Try out the encode a simple password demo [rorbuilder.info].

see also: Reading an XML file usng JavaScript [snippets.dzone.com]

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