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| author | Andreas Fischer <bantu@phpbb.com> | 2010-05-17 09:40:32 +0200 |
|---|---|---|
| committer | Andreas Fischer <bantu@phpbb.com> | 2010-05-17 09:44:48 +0200 |
| commit | c2b29c317f2d3bf41ed737c9eb3d49bce41ec432 (patch) | |
| tree | a8c43d327787c7cd3e3480c08ee4bfe0b8f9712b /phpBB/includes/functions.php | |
| parent | af21e38c1d6f3fd738c97bd6cf0f96285c0b35aa (diff) | |
| download | forums-c2b29c317f2d3bf41ed737c9eb3d49bce41ec432.tar forums-c2b29c317f2d3bf41ed737c9eb3d49bce41ec432.tar.gz forums-c2b29c317f2d3bf41ed737c9eb3d49bce41ec432.tar.bz2 forums-c2b29c317f2d3bf41ed737c9eb3d49bce41ec432.tar.xz forums-c2b29c317f2d3bf41ed737c9eb3d49bce41ec432.zip | |
[ticket/9612] Introduce new function gen_rand_string_friendly().
Introduce new function gen_rand_string_friendly() for user friendly random
strings like passwords and captcha codes. Strings generated by
gen_rand_string_friendly() will not contain the characters 0 and O.
By adding a new function we can increase the entropy of strings
generated by gen_rand_string() by putting 0 and O back in.
PHPBB3-9612
Diffstat (limited to 'phpBB/includes/functions.php')
| -rw-r--r-- | phpBB/includes/functions.php | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/phpBB/includes/functions.php b/phpBB/includes/functions.php index cd8447a2a3..2b5b8e6092 100644 --- a/phpBB/includes/functions.php +++ b/phpBB/includes/functions.php @@ -195,10 +195,27 @@ function set_config_count($config_name, $increment, $is_dynamic = false) /** * Generates an alphanumeric random string of given length +* +* @return string */ function gen_rand_string($num_chars = 8) { + // [a, z] + [0, 9] = 36 + return strtoupper(base_convert(unique_id(), 16, 36)); +} + +/** +* Generates a user-friendly alphanumeric random string of given length +* We remove 0 and O so users cannot confuse those in passwords etc. +* +* @return string +*/ +function gen_rand_string_friendly($num_chars = 8) +{ $rand_str = unique_id(); + + // Remove Z and Y from the base_convert(), replace 0 with Z and O with Y + // [a, z] + [0, 9] - {z, y} = [a, z] + [0, 9] - {0, o} = 34 $rand_str = str_replace(array('0', 'O'), array('Z', 'Y'), strtoupper(base_convert($rand_str, 16, 34))); return substr($rand_str, 0, $num_chars); |