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| 1 | // Password strength meter
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| 2 | function passwordStrength(password,username) {
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| 3 | var shortPass = 1, badPass = 2, goodPass = 3, strongPass = 4, symbolSize = 0, natLog, score;
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| 4 |
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| 5 | //password < 4
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| 6 | if (password.length < 4 ) { return shortPass };
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| 7 |
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| 8 | //password == username
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| 9 | if (password.toLowerCase()==username.toLowerCase()) return badPass;
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| 10 |
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| 11 | if (password.match(/[0-9]/)) symbolSize +=10;
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| 12 | if (password.match(/[a-z]/)) symbolSize +=26;
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| 13 | if (password.match(/[A-Z]/)) symbolSize +=26;
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| 14 | if (password.match(/[^a-zA-Z0-9]/)) symbolSize +=31;
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| 15 |
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| 16 | natLog = Math.log( Math.pow(symbolSize,password.length) );
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| 17 | score = natLog / Math.LN2;
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| 18 | if (score < 40 ) return badPass
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| 19 | if (score < 56 ) return goodPass
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| 20 | return strongPass;
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| 21 | }
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