60 lines
1.4 KiB
PHP
60 lines
1.4 KiB
PHP
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<?php
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namespace App;
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class Entropy
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{
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public static function CharPoolSize($password)
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{
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$n_options = 0;
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if(preg_match("/[0-9]+/",$password)) // check numbers
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$n_options += 10;
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if(preg_match("/[a-z]+/",$password)) // check lowercase
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$n_options += 26;
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if(preg_match("/[A-Z]+/",$password)) // check
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$n_options += 26;
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if(preg_match("/[\W_ ]+/",$password)) // check specialchars
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$n_options += 32;
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return $n_options;
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}
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public static function CountUniqueChars($str)
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{
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$characters = array();
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$count = 0;
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$length= strlen($str);
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//loop, figure it out
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for($x = 0; $x < $length; $x++)
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{
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$c = $str[$x];
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if(!in_array($c,$characters))
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{
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$characters[] = $c;
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$count += 1;
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}
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}
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return $count;
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}
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public static function Calculate($password,$base=false)
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{
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// first we check which sets of characters are available in the password
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if($base === false || !is_numeric($base))
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$base = static::CharPoolSize($password);
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return static::CalculateEntropy(strlen($password),$base);
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}
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public static function CalculateEntropy($length,$poolsize)
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{
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if($poolsize == 1)
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return log($length,2);
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else
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return $length * log($poolsize,2);
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}
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}
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