84 lines
2.6 KiB
JavaScript
84 lines
2.6 KiB
JavaScript
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define("entropy",['jquery'],function($){
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/**
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* Determine the size of the character pool used in a password. Useful to calculate password entropy
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* param password: The password to analyze
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* returns: int
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*/
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function CharPoolSize(password)
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{
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if ((undefined === password) || (null === password)) {
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return 0;
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}
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var re_digits = new RegExp("[0-9]+");
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var re_lowercase = new RegExp("[a-z]+");
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var re_uppercase = new RegExp("[A-Z]+");
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var re_specialchars = new RegExp("[\W_ ]+");
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var n_options = 0;
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if(password.match(re_digits)) // check numbers
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n_options += 10;
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if(password.match(re_lowercase)) // check lowercase
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n_options += 26;
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if(password.match(re_uppercase)) // check
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n_options += 26;
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if(password.match(re_specialchars)) // check specialchars
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n_options += 32;
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return n_options;
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}
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/**
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* Determine the number of unique characters in a string. Useful to calculate password entropy</description>
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* returns: int
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* param str: The string to analyze
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*/
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function CountUniqueChars(str)
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{
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var characters = new Array();
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var count = 0;
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var length= str.length;
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var x;
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//loop, figure it out
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for(x = 0; x < length; x++) {
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var c = str.charAt(x)
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if($.inArray(c,characters) == -1)
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{
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characters.push(c);
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count += 1;
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}
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}
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return count;
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}
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/**
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* Calculate the entropy of a series of tokens (in bits)</description>
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* returns : float
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* param length: The length of the token series
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* param poolsize: The size of the token pool from which the tokens are picked
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*/
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function CalculateEntropy(length,poolsize)
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{
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if ((undefined === poolsize) || (null === poolsize) || (0 === poolsize))
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{
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return 0; // entropy per char would be NaN, we take that as 0, and length * 0 is 0 bits of entropy
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}
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if(poolsize == 1) // on a pool size of one, the calculation is similar to the base2log of the length, since we have to attempt [length] times to get there
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{
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return (Math.log(length)/Math.LN2); //base2log(length);
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}
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return length * (Math.log(poolsize)/Math.LN2); //length * base2log(poolsize);
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}
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let my = {
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calculate: function(password)
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{
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let base = CharPoolSize(password);
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return CalculateEntropy(password.length,base);
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},
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};
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return my;
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});
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