Verzeichnisstruktur phpBB-3.1.0
- Veröffentlicht
- 27.10.2014
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helper.php
001 <?php
002 /**
003 *
004 * This file is part of the phpBB Forum Software package.
005 *
006 * @copyright (c) phpBB Limited <https://www.phpbb.com>
007 * @license GNU General Public License, version 2 (GPL-2.0)
008 *
009 * For full copyright and license information, please see
010 * the docs/CREDITS.txt file.
011 *
012 */
013
014 namespace phpbb\passwords\driver;
015
016 class helper
017 {
018 /**
019 * @var \phpbb\config\config
020 */
021 protected $config;
022
023 /**
024 * base64 alphabet
025 * @var string
026 */
027 public $itoa64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
028
029 /**
030 * Construct a driver helper object
031 *
032 * @param \phpbb\config\config $config phpBB configuration
033 */
034 public function __construct(\phpbb\config\config $config)
035 {
036 $this->config = $config;
037 }
038
039 /**
040 * Base64 encode hash
041 *
042 * @param string $input Input string
043 * @param int $count Input string length
044 *
045 * @return string base64 encoded string
046 */
047 public function hash_encode64($input, $count)
048 {
049 $output = '';
050 $i = 0;
051
052 do
053 {
054 $value = ord($input[$i++]);
055 $output .= $this->itoa64[$value & 0x3f];
056
057 if ($i < $count)
058 {
059 $value |= ord($input[$i]) << 8;
060 }
061
062 $output .= $this->itoa64[($value >> 6) & 0x3f];
063
064 if ($i++ >= $count)
065 {
066 break;
067 }
068
069 if ($i < $count)
070 {
071 $value |= ord($input[$i]) << 16;
072 }
073
074 $output .= $this->itoa64[($value >> 12) & 0x3f];
075
076 if ($i++ >= $count)
077 {
078 break;
079 }
080
081 $output .= $this->itoa64[($value >> 18) & 0x3f];
082 }
083 while ($i < $count);
084
085 return $output;
086 }
087
088 /**
089 * Return unique id
090 *
091 * @param string $extra Additional entropy
092 *
093 * @return string Unique id
094 */
095 public function unique_id($extra = 'c')
096 {
097 static $dss_seeded = false;
098
099 $val = $this->config['rand_seed'] . microtime();
100 $val = md5($val);
101 $this->config['rand_seed'] = md5($this->config['rand_seed'] . $val . $extra);
102
103 if ($dss_seeded !== true && ($this->config['rand_seed_last_update'] < time() - rand(1,10)))
104 {
105 $this->config->set('rand_seed_last_update', time(), true);
106 $this->config->set('rand_seed', $this->config['rand_seed'], true);
107 $dss_seeded = true;
108 }
109
110 return substr($val, 4, 16);
111 }
112
113 /**
114 * Get random salt with specified length
115 *
116 * @param int $length Salt length
117 * @param string $rand_seed Seed for random data (optional). For tests.
118 *
119 * @return string Random salt with specified length
120 */
121 public function get_random_salt($length, $rand_seed = '/dev/urandom')
122 {
123 $random = '';
124
125 if (($fh = @fopen($rand_seed, 'rb')))
126 {
127 $random = fread($fh, $length);
128 fclose($fh);
129 }
130
131 if (strlen($random) < $length)
132 {
133 $random = '';
134 $random_state = $this->unique_id();
135
136 for ($i = 0; $i < $length; $i += 16)
137 {
138 $random_state = md5($this->unique_id() . $random_state);
139 $random .= pack('H*', md5($random_state));
140 }
141 $random = substr($random, 0, $length);
142 }
143 return $random;
144 }
145
146 /**
147 * Compare two strings byte by byte
148 *
149 * @param string $string_a The first string
150 * @param string $string_b The second string
151 *
152 * @return bool True if strings are the same, false if not
153 */
154 public function string_compare($string_a, $string_b)
155 {
156 $difference = strlen($string_a) != strlen($string_b);
157
158 for ($i = 0; $i < strlen($string_a) && $i < strlen($string_b); $i++)
159 {
160 $difference |= $string_a[$i] != $string_b[$i];
161 }
162
163 return $difference === 0;
164 }
165 }
166