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