// 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/
-
-var shortPass = pwsL10n.short
-var badPass = pwsL10n.bad
-var goodPass = pwsL10n.good
-var strongPass = pwsL10n.strong
-
function passwordStrength(password,username) {
- score = 0
+ var shortPass = 1, badPass = 2, goodPass = 3, strongPass = 4;
- //password < 4
- if (password.length < 4 ) { return shortPass }
+ //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
-
- //password has 3 numbers
- if (password.match(/(.*[0-9].*[0-9].*[0-9])/)) score += 5
-
- //password has 2 sybols
- if (password.match(/(.*[!,@,#,$,%,^,&,*,?,_,~].*[!,@,#,$,%,^,&,*,?,_,~])/)) score += 5
-
- //password has Upper and Lower chars
- if (password.match(/([a-z].*[A-Z])|([A-Z].*[a-z])/)) score += 10
-
- //password has number and chars
- if (password.match(/([a-zA-Z])/) && password.match(/([0-9])/)) score += 15
- //
- //password has number and symbol
- if (password.match(/([!,@,#,$,%,^,&,*,?,_,~])/) && password.match(/([0-9])/)) score += 15
-
- //password has char and symbol
- if (password.match(/([!,@,#,$,%,^,&,*,?,_,~])/) && password.match(/([a-zA-Z])/)) score += 15
-
- //password is just a nubers or chars
- if (password.match(/^\w+$/) || password.match(/^\d+$/) ) score -= 10
-
- //verifing 0 < score < 100
- if ( score < 0 ) score = 0
- if ( score > 100 ) score = 100
-
- if (score < 34 ) return badPass
- if (score < 68 ) 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
-}
-
+ if (password.toLowerCase()==username.toLowerCase()) return badPass;
+
+ var symbolSize = 0;
+ if (password.match(/[0-9]/)) symbolSize +=10;
+ if (password.match(/[a-z]/)) symbolSize +=26;
+ if (password.match(/[A-Z]/)) symbolSize +=26;
+ if (password.match(/[^a-zA-Z0-9]/)) symbolSize +=31;
+
+ var natLog = Math.log( Math.pow(symbolSize,password.length) );
+ var score = natLog / Math.LN2;
+ if (score < 40 ) return badPass
+ if (score < 56 ) return goodPass
+ return strongPass;
+}
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