WordPress/wp-admin/js/password-strength-meter.js

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// Password strength meter
// This jQuery plugin is written by firas kassem [2007.04.05]
// Firas Kassem phiras.wordpress.com || phiras at gmail {dot} com
// for more information : http://phiras.wordpress.com/2007/04/08/password-strength-meter-a-jquery-plugin/
function passwordStrength(password,username) {
var shortPass = 1, badPass = 2, goodPass = 3, strongPass = 4, score = 0, d, s, u, l;
//password < 4
if (password.length < 4 ) { return shortPass };
//password == username
if (password.toLowerCase()==username.toLowerCase()) return badPass;
//password length
score += password.length * 4;
score += ( checkRepetition(1,password).length - password.length ) * 1;
score += ( checkRepetition(2,password).length - password.length ) * 1;
score += ( checkRepetition(3,password).length - password.length ) * 1;
score += ( checkRepetition(4,password).length - password.length ) * 1;
d = password.match(/\d/g);
s = password.match(/[^\d\w]/g);
u = password.match(/[A-Z]/g);
l = password.match(/[a-z]/g);
//password has 3 numbers
if ( d && d.length > 2 ) score += 5;
//password has 2 sybols
if ( s && s.length > 1 ) score += 10;
//password has Upper and Lower chars
if ( u && l ) score += 10;
//password has number and chars
if ( u && l && d ) score += 15;
//
//password has number and symbol
if ( s && d ) score += 15;
//password has Upper char and symbol
if ( u && s ) score += 15;
//password is just a nubers or chars
if ( ! s ) score -= 10;
//verifing 0 < score < 100
if ( score < 0 ) score = 0;
if ( score > 100 ) score = 100;
if ( score < 34 ) return badPass;
if ( score < 68 || password.length < 7 ) return goodPass;
return strongPass;
}
// checkRepetition(1,'aaaaaaabcbc') = 'abcbc'
// checkRepetition(2,'aaaaaaabcbc') = 'aabc'
// checkRepetition(2,'aaaaaaabcdbcd') = 'aabcd'
function checkRepetition(pLen,str) {
res = ""
for ( i=0; i<str.length ; i++ ) {
repeated=true
for (j=0;j < pLen && (j+i+pLen) < str.length;j++)
repeated=repeated && (str.charAt(j+i)==str.charAt(j+i+pLen))
if (j<pLen) repeated=false
if (repeated) {
i+=pLen-1
repeated=false
}
else {
res+=str.charAt(i)
}
}
return res
}