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