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Title : Passgen: Automatically generate mixed case alpha numeric passwords
Categories : PHP, Security Update Picture
Simon Booth
Date : May 23rd 2000
Grade : 5 of 5 (graded 1 times)
Viewed : 7135
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<script language="php">

function passgen($len)
{
$pass = "";

if($len > 5 && $len < 17)
{
srand((double) microtime() * 1000000);
for($i=0;$i<12;$i++)
{
$pass .= chr(rand(0,255));
}
$pass = substr(base64_encode($pass), 0, $len);
}
return $pass;
}

</script>

<!--
Function passgen (above) creates a random password suitable for any use. The
generated passwords are pure junk - using mixed alpha, numeric and a few symbols.

Usage:

passgen(int password_length);

Password length can be anything from 6 to 16 characters. Other length values
result in an empty string being returned.

Method:

Quite simple. A string of 12 random 8 bit characters is built up in a loop. The
resulting random 12 bytes of data are then UU-Encoded which provides a 16
character string of mixed case, numerics and a few symbols. This is then
shortened to the length requested in the parameter passed to passgen to return
a random password of the requires length.

Example usage below (you can just chuck this on a server to see what it does).
Strip out the function above to use it in your own code.
-->

<html>
<head>
<title>Password Generator</title>
</head>
<body bgcolor="#FFFFFF">

<p>
<font face="Arial" size="4">
Password generator example
</font>
</p>

<pre>
<script language="php">
for($i=0;$i<8;$i++)
{
echo passgen(8)."<br>";
}
</script>
</pre>

</body>
</html>



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 Zaid Crowe wrote :1258
ive been scouring the net for a good simple alphnumeric random string generator ......and this one rocks!