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// Password strength meter
function passwordStrength(password1, username, password2) {
var shortPass = 1, badPass = 2, goodPass = 3, strongPass = 4, mismatch = 5, symbolSize = 0, natLog, score;
// password 1 != password 2
if ( (password1 != password2) && password2.length > 0)
return mismatch
//password < 4
if ( password1.length < 4 )
return shortPass
//password1 == username
if ( password1.toLowerCase() == username.toLowerCase() )
return badPass;
if ( password1.match(/[0-9]/) )
symbolSize +=10;
if ( password1.match(/[a-z]/) )
symbolSize +=26;
if ( password1.match(/[A-Z]/) )
symbolSize +=26;
if ( password1.match(/[^a-zA-Z0-9]/) )
symbolSize +=31;
natLog = Math.log( Math.pow(symbolSize, password1.length) );
score = natLog / Math.LN2;
if (score < 40 )
return badPass
if (score < 56 )
return goodPass
return strongPass;
}
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