Forked from raveren/cryptographically_secure_random_strings.php
Created
January 1, 2020 05:43
-
-
Save Nabil5352/e8d56735259d6a328a9591148b4f089e to your computer and use it in GitHub Desktop.
Generate cryptographically secure random strings. Based on Kohana's Text::random() method and this answer: http://stackoverflow.com/a/13733588/179104
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
function random_text( $type = 'alnum', $length = 8 ) | |
{ | |
switch ( $type ) { | |
case 'alnum': | |
$pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'; | |
break; | |
case 'alpha': | |
$pool = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'; | |
break; | |
case 'hexdec': | |
$pool = '0123456789abcdef'; | |
break; | |
case 'numeric': | |
$pool = '0123456789'; | |
break; | |
case 'nozero': | |
$pool = '123456789'; | |
break; | |
case 'distinct': | |
$pool = '2345679ACDEFHJKLMNPRSTUVWXYZ'; | |
break; | |
default: | |
$pool = (string) $type; | |
break; | |
} | |
$crypto_rand_secure = function ( $min, $max ) { | |
$range = $max - $min; | |
if ( $range < 0 ) return $min; // not so random... | |
$log = log( $range, 2 ); | |
$bytes = (int) ( $log / 8 ) + 1; // length in bytes | |
$bits = (int) $log + 1; // length in bits | |
$filter = (int) ( 1 << $bits ) - 1; // set all lower bits to 1 | |
do { | |
$rnd = hexdec( bin2hex( openssl_random_pseudo_bytes( $bytes ) ) ); | |
$rnd = $rnd & $filter; // discard irrelevant bits | |
} while ( $rnd >= $range ); | |
return $min + $rnd; | |
}; | |
$token = ""; | |
$max = strlen( $pool ); | |
for ( $i = 0; $i < $length; $i++ ) { | |
$token .= $pool[$crypto_rand_secure( 0, $max )]; | |
} | |
return $token; | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment