2012-08-22 20:04:18 -04:00
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// Password strength meter
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function passwordStrength(password1, username, password2) {
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var shortPass = 1, badPass = 2, goodPass = 3, strongPass = 4, mismatch = 5, symbolSize = 0, natLog, score;
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// password 1 != password 2
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if ( (password1 != password2) && password2.length > 0)
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return mismatch
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//password < 4
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if ( password1.length < 4 )
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return shortPass
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//password1 == username
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if ( password1.toLowerCase() == username.toLowerCase() )
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return badPass;
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if ( password1.match(/[0-9]/) )
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symbolSize +=10;
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if ( password1.match(/[a-z]/) )
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symbolSize +=26;
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if ( password1.match(/[A-Z]/) )
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symbolSize +=26;
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if ( password1.match(/[^a-zA-Z0-9]/) )
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symbolSize +=31;
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natLog = Math.log( Math.pow(symbolSize, password1.length) );
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score = natLog / Math.LN2;
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if (score < 40 )
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return badPass
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if (score < 56 )
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return goodPass
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return strongPass;
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}
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