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