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| <?php | |
| /** | |
| * | |
| * This file is part of the phpBB Forum Software package. | |
| * | |
| * @copyright (c) phpBB Limited <https://www.phpbb.com> | |
| * @license GNU General Public License, version 2 (GPL-2.0) | |
| * | |
| * For full copyright and license information, please see | |
| * the docs/CREDITS.txt file. | |
| * | |
| */ | |
| namespace phpbb\passwords\driver; | |
| class helper | |
| { | |
| /** | |
| * @var \phpbb\config\config | |
| */ | |
| protected $config; | |
| /** | |
| * base64 alphabet | |
| * @var string | |
| */ | |
| public $itoa64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'; | |
| /** | |
| * Construct a driver helper object | |
| * | |
| * @param \phpbb\config\config $config phpBB configuration | |
| */ | |
| public function __construct(\phpbb\config\config $config) | |
| { | |
| $this->config = $config; | |
| } | |
| /** | |
| * Base64 encode hash | |
| * | |
| * @param string $input Input string | |
| * @param int $count Input string length | |
| * | |
| * @return string base64 encoded string | |
| */ | |
| public function hash_encode64($input, $count) | |
| { | |
| $output = ''; | |
| $i = 0; | |
| do | |
| { | |
| $value = ord($input[$i++]); | |
| $output .= $this->itoa64[$value & 0x3f]; | |
| if ($i < $count) | |
| { | |
| $value |= ord($input[$i]) << 8; | |
| } | |
| $output .= $this->itoa64[($value >> 6) & 0x3f]; | |
| if ($i++ >= $count) | |
| { | |
| break; | |
| } | |
| if ($i < $count) | |
| { | |
| $value |= ord($input[$i]) << 16; | |
| } | |
| $output .= $this->itoa64[($value >> 12) & 0x3f]; | |
| if ($i++ >= $count) | |
| { | |
| break; | |
| } | |
| $output .= $this->itoa64[($value >> 18) & 0x3f]; | |
| } | |
| while ($i < $count); | |
| return $output; | |
| } | |
| /** | |
| * Return unique id | |
| * | |
| * @param string $extra Additional entropy | |
| * | |
| * @return string Unique id | |
| */ | |
| public function unique_id($extra = 'c') | |
| { | |
| static $dss_seeded = false; | |
| $val = $this->config['rand_seed'] . microtime(); | |
| $val = md5($val); | |
| $this->config['rand_seed'] = md5($this->config['rand_seed'] . $val . $extra); | |
| if ($dss_seeded !== true && ($this->config['rand_seed_last_update'] < time() - rand(1,10))) | |
| { | |
| $this->config->set('rand_seed_last_update', time(), true); | |
| $this->config->set('rand_seed', $this->config['rand_seed'], true); | |
| $dss_seeded = true; | |
| } | |
| return substr($val, 4, 16); | |
| } | |
| /** | |
| * Get random salt with specified length | |
| * | |
| * @param int $length Salt length | |
| * @param string $rand_seed Seed for random data (optional). For tests. | |
| * | |
| * @return string Random salt with specified length | |
| */ | |
| public function get_random_salt($length, $rand_seed = '/dev/urandom') | |
| { | |
| $random = ''; | |
| if (($fh = @fopen($rand_seed, 'rb'))) | |
| { | |
| $random = fread($fh, $length); | |
| fclose($fh); | |
| } | |
| if (strlen($random) < $length) | |
| { | |
| $random = ''; | |
| $random_state = $this->unique_id(); | |
| for ($i = 0; $i < $length; $i += 16) | |
| { | |
| $random_state = md5($this->unique_id() . $random_state); | |
| $random .= pack('H*', md5($random_state)); | |
| } | |
| $random = substr($random, 0, $length); | |
| } | |
| return $random; | |
| } | |
| /** | |
| * Compare two strings byte by byte | |
| * | |
| * @param string $string_a The first string | |
| * @param string $string_b The second string | |
| * | |
| * @return bool True if strings are the same, false if not | |
| */ | |
| public function string_compare($string_a, $string_b) | |
| { | |
| // Return if input variables are not strings or if length does not match | |
| if (!is_string($string_a) || !is_string($string_b) || strlen($string_a) != strlen($string_b)) | |
| { | |
| return false; | |
| } | |
| // Use hash_equals() if it's available | |
| if (function_exists('hash_equals')) | |
| { | |
| return hash_equals($string_a, $string_b); | |
| } | |
| $difference = 0; | |
| for ($i = 0; $i < strlen($string_a) && $i < strlen($string_b); $i++) | |
| { | |
| $difference |= ord($string_a[$i]) ^ ord($string_b[$i]); | |
| } | |
| return $difference === 0; | |
| } | |
| } |