[Summary view] [Print] [Text view]

   1  // Password strength meter
   2  function passwordStrength(password,username) {
   3      var shortPass = 1, badPass = 2, goodPass = 3, strongPass = 4, symbolSize = 0, natLog, score;
   4  
   5      //password < 4
   6      if (password.length < 4 ) { return shortPass };
   7  
   8      //password == username
   9      if (password.toLowerCase()==username.toLowerCase()) return badPass;
  10  
  11      if (password.match(/[0-9]/)) symbolSize +=10;
  12      if (password.match(/[a-z]/)) symbolSize +=26;
  13      if (password.match(/[A-Z]/)) symbolSize +=26;
  14      if (password.match(/[^a-zA-Z0-9]/)) symbolSize +=31;
  15  
  16      natLog = Math.log( Math.pow(symbolSize,password.length) );
  17      score = natLog / Math.LN2;
  18      if (score < 40 )  return badPass
  19      if (score < 56 )  return goodPass
  20      return strongPass;
  21  }