mirror of
https://github.com/phpbb/phpbb.git
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142 lines
2.6 KiB
PHP
142 lines
2.6 KiB
PHP
<?php
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/**
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*
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* @package phpBB3
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* @copyright (c) 2013 phpBB Group
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* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
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*
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*/
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namespace phpbb\passwords\driver;
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/**
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* @package passwords
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*/
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class helper
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{
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/**
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* @var phpbb\config\config
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*/
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protected $config;
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/**
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* base64 alphabet
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* @var string
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*/
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public $itoa64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
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/**
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* Construct a driver helper object
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*
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* @param phpbb\config\config $config phpBB configuration
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*/
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public function __construct(\phpbb\config\config $config)
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{
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$this->config = $config;
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}
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/**
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* Base64 encode hash
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*
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* @param string $input Input string
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* @param int $count Input string length
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*
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* @return string base64 encoded string
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*/
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public function hash_encode64($input, $count)
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{
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$output = '';
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$i = 0;
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do
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{
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$value = ord($input[$i++]);
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$output .= $this->itoa64[$value & 0x3f];
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if ($i < $count)
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{
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$value |= ord($input[$i]) << 8;
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}
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$output .= $this->itoa64[($value >> 6) & 0x3f];
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if ($i++ >= $count)
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{
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break;
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}
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if ($i < $count)
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{
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$value |= ord($input[$i]) << 16;
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}
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$output .= $this->itoa64[($value >> 12) & 0x3f];
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if ($i++ >= $count)
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{
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break;
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}
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$output .= $this->itoa64[($value >> 18) & 0x3f];
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}
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while ($i < $count);
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return $output;
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}
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/**
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* Return unique id
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* @param string $extra additional entropy
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*
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* @return string Unique id
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*/
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public function unique_id($extra = 'c')
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{
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static $dss_seeded = false;
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$val = $this->config['rand_seed'] . microtime();
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$val = md5($val);
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$this->config['rand_seed'] = md5($this->config['rand_seed'] . $val . $extra);
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if ($dss_seeded !== true && ($this->config['rand_seed_last_update'] < time() - rand(1,10)))
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{
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$this->config->set('rand_seed_last_update', time(), true);
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$this->config->set('rand_seed', $this->config['rand_seed'], true);
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$dss_seeded = true;
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}
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return substr($val, 4, 16);
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}
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/**
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* Get random salt with specified length
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*
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* @param int $length Salt length
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* @param string $rand_seed Seed for random data (optional). For tests.
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*/
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public function get_random_salt($length, $rand_seed = '/dev/urandom')
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{
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$random = '';
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if (($fh = @fopen($rand_seed, 'rb')))
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{
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$random = fread($fh, $length);
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fclose($fh);
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}
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if (strlen($random) < $length)
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{
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$random = '';
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$random_state = $this->unique_id();
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for ($i = 0; $i < $length; $i += 16)
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{
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$random_state = md5($this->unique_id() . $random_state);
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$random .= pack('H*', md5($random_state));
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}
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$random = substr($random, 0, $length);
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}
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return $random;
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}
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}
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