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[ticket/15723] Rewrite gen_rand_string() and gen_rand_string_friendly()

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PHPBB3-15723
This commit is contained in:
Rubén Calvo 2018-07-14 11:42:32 +02:00
parent 911c46cc61
commit ffcfec044b
1 changed files with 20 additions and 7 deletions
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27
phpBB/includes/functions.php
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@ -73,8 +73,17 @@ function set_var(&$result, $var, $type, $multibyte = false)
*/ */
function gen_rand_string($num_chars = 8) function gen_rand_string($num_chars = 8)
{ {
// [a, z] + [0, 9] = 36 $range = array_merge(range('A', 'Z'), range(0, 9));
return substr(strtoupper(base_convert(bin2hex(random_bytes($num_chars + 1)), 16, 36)), 0, $num_chars); $size = count($range);
$output = '';
for ($i = 0; $i < $num_chars; $i++)
{
$rand = random_int(0, $size-1);
$output .= $range[$rand];
}
return $output;
} }
/** /**
@ -88,13 +97,17 @@ function gen_rand_string($num_chars = 8)
*/ */
function gen_rand_string_friendly($num_chars = 8) function gen_rand_string_friendly($num_chars = 8)
{ {
$rand_str = bin2hex(random_bytes($num_chars + 1)); $range = array_merge(range('A', 'N'), range('P', 'Z'), range(1, 9));
$size = count($range);
// Remove Z and Y from the base_convert(), replace 0 with Z and O with Y $output = '';
// [a, z] + [0, 9] - {z, y} = [a, z] + [0, 9] - {0, o} = 34 for ($i = 0; $i < $num_chars; $i++)
$rand_str = str_replace(array('0', 'O'), array('Z', 'Y'), strtoupper(base_convert($rand_str, 16, 34))); {
$rand = random_int(0, $size-1);
$output .= $range[$rand];
}
return substr($rand_str, 0, $num_chars); return $output;
} }
/** /**