php : PHP Password Functions

Published: 3 yearss ago

Originally published April 2007 - http://blogs.igeek.com.au/DarkAz/

Here's a couple of basic password generating functions I've created which have come in quite handy.

Item 1: Basic random password generator

The first is a basic random password generator - you simply define the length required for the password and the function returns an alphanumeric string of random characters:

function Random_Password($length) {
	list($usec, $sec) = explode(' ', microtime());
	srand((float) $sec + ((float) $usec * 100000));
	$possible_characters = "23456789abcdefghijkmnopqrstuvwxyzABCDEFGHIJKLMNPQRSTUVWXYZ";
	// note that 0 and O, 1 and l (that's zero and 'oh', one and 'el') 
	// have been omitted as they are easily confused
	$passstring = "";
	while(strlen($passstring)<$length) {
	    $passstring .= substr($possible_characters, rand(0,strlen($possible_characters)),1);
	}
	return($passstring);
}

Examples:
RandomPassword(5) returned Dgh6W
RandomPassword(10) returned qWAGx3QyeC

Item 2: L337-speak password generator

OK I'm really over the whole concept of L337 (Elite) speak - but it is quite handy for passwords - this function will convert any string into a L337 style password

function LeetPass($original,$justalphanum) {
	// leet speak password generator
	// simply enter a word and get a mixed case equivalent with numbers replacing some letters
	// also strips any non alphanumeric characters within the string
	
	if ($justalphanum) { // check to see if we are stripping out non alpha-numeric characters
		$original = preg_replace("/[^a-zA-Z0-9]/","",$original);
	}
	$find = array("o","i","z","e","a","s","g","b"," ");
	$replace = array("0","1","2","3","4","5","6","8","");
	
	// go through and randomly replace lowercase letters with uppercase
	$stage1 = str_replace($find,$replace,strtolower($original));
	
	$stage2 = "";
	for ($i=0;$i < strlen($stage1);$i++) {
		if (ctype_digit(substr($stage1,$i,1))) { // it's a number
			$stage2 .= substr($stage1,$i,1);
		} else { // it's not a number, so probably a letter
			if (rand(0,1)) {
				$stage2 .= strtoupper(substr($stage1,$i,1));
			} else {
				$stage2 .= substr($stage1,$i,1);
			}	
		}
	}

	return ($stage2);
}

Examples:
LeetPass("L337-speak password generator",false) returned L337-5P34k p455W0Rd 63n3r4t0r
LeetPass("elite-speak, it's truly a thing of the past!",true) returned 3l1T35P34k1t5tRULy4TH1n60FtH3P45T

php : PHP Password Functions

Item 1: Basic random password generator

Item 2: L337-speak password generator

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