<?php /** * Portable PHP password hashing framework. * @package phpass * @since 2.5.0 * @version 0.5 / WordPress * @link https://www.openwall.com/phpass/ */ # # Portable PHP password hashing framework. # # Version 0.5.4 / WordPress. # # Written by Solar Designer <solar at openwall.com> in 2004-2006 and placed in # the public domain. Revised in subsequent years, still public domain. # # There's absolutely no warranty. # # The homepage URL for this framework is: # # http://www.openwall.com/phpass/ # # Please be sure to update the Version line if you edit this file in any way. # It is suggested that you leave the main version number intact, but indicate # your project name (after the slash) and add your own revision information. # # Please do not change the "private" password hashing method implemented in # here, thereby making your hashes incompatible. However, if you must, please # change the hash type identifier (the "$P$") to something different. # # Obviously, since this code is in the public domain, the above are not # requirements (there can be none), but merely suggestions. # /** * Portable PHP password hashing framework. * * @package phpass * @version 0.5 / WordPress * @link https://www.openwall.com/phpass/ * @since 2.5.0 */ class PasswordHash { var $itoa64; var $iteration_count_log2; var $portable_hashes; var $random_state; function __construct($iteration_count_log2, $portable_hashes) { $this->itoa64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'; if ($iteration_count_log2 < 4 || $iteration_count_log2 > 31) { $iteration_count_log2 = 8; } $this->iteration_count_log2 = $iteration_count_log2; $this->portable_hashes = $portable_hashes; $this->random_state = microtime(); if (function_exists('getmypid')) { $this->random_state .= getmypid(); } } function PasswordHash($iteration_count_log2, $portable_hashes) { self::__construct($iteration_count_log2, $portable_hashes); } function get_random_bytes($count) { $output = ''; if (@is_readable('/dev/urandom') && ($fh = @fopen('/dev/urandom', 'rb'))) { $output = fread($fh, $count); fclose($fh); } if (strlen($output) < $count) { $output = ''; for ($i = 0; $i < $count; $i += 16) { $this->random_state = md5(microtime() . $this->random_state); $output .= md5($this->random_state, TRUE); } $output = substr($output, 0, $count); } return $output; } function encode64($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 $output; } function gensalt_private($input) { $output = '$P$'; $output .= $this->itoa64[min($this->iteration_count_log2 + 5, 30)]; $output .= $this->encode64($input, 6); return $output; } function crypt_private($password, $setting) { $output = '*0'; if (substr($setting, 0, 2) === $output) { $output = '*1'; } $id = substr($setting, 0, 3); # We use "$P$", phpBB3 uses "$H$" for the same thing if ($id !== '$P$' && $id !== '$H$') { return $output; } $count_log2 = strpos($this->itoa64, $setting[3]); if ($count_log2 < 7 || $count_log2 > 30) { return $output; } $count = 1 << $count_log2; $salt = substr($setting, 4, 8); if (strlen($salt) !== 8) { return $output; } # We were kind of forced to use MD5 here since it's the only # cryptographic primitive that was available in all versions # of PHP in use. To implement our own low-level crypto in PHP # would have resulted in much worse performance and # consequently in lower iteration counts and hashes that are # quicker to crack (by non-PHP code). $hash = md5($salt . $password, TRUE); do { $hash = md5($hash . $password, TRUE); } while (--$count); $output = substr($setting, 0, 12); $output .= $this->encode64($hash, 16); return $output; } function gensalt_blowfish($input) { # This one needs to use a different order of characters and a # different encoding scheme from the one in encode64() above. # We care because the last character in our encoded string will # only represent 2 bits. While two known implementations of # bcrypt will happily accept and correct a salt string which # has the 4 unused bits set to non-zero, we do not want to take # chances and we also do not want to waste an additional byte # of entropy. $itoa64 = './ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'; $output = '$2a$'; $output .= chr((int)(ord('0') + $this->iteration_count_log2 / 10)); $output .= chr(ord('0') + $this->iteration_count_log2 % 10); $output .= '$'; $i = 0; do { $c1 = ord($input[$i++]); $output .= $itoa64[$c1 >> 2]; $c1 = ($c1 & 0x03) << 4; if ($i >= 16) { $output .= $itoa64[$c1]; break; } $c2 = ord($input[$i++]); $c1 |= $c2 >> 4; $output .= $itoa64[$c1]; $c1 = ($c2 & 0x0f) << 2; $c2 = ord($input[$i++]); $c1 |= $c2 >> 6; $output .= $itoa64[$c1]; $output .= $itoa64[$c2 & 0x3f]; } while (1); return $output; } function HashPassword($password) { if ( strlen( $password ) > 4096 ) { return '*'; } $random = ''; if (CRYPT_BLOWFISH === 1 && !$this->portable_hashes) { $random = $this->get_random_bytes(16); $hash = crypt($password, $this->gensalt_blowfish($random)); if (strlen($hash) === 60) { return $hash; } } if (strlen($random) < 6) { $random = $this->get_random_bytes(6); } $hash = $this->crypt_private($password, $this->gensalt_private($random)); if (strlen($hash) === 34) { return $hash; } # Returning '*' on error is safe here, but would _not_ be safe # in a crypt(3)-like function used _both_ for generating new # hashes and for validating passwords against existing hashes. return '*'; } function CheckPassword($password, $stored_hash) { if ( strlen( $password ) > 4096 ) { return false; } $hash = $this->crypt_private($password, $stored_hash); if ($hash[0] === '*') { $hash = crypt($password, $stored_hash); } # This is not constant-time. In order to keep the code simple, # for timing safety we currently rely on the salts being # unpredictable, which they are at least in the non-fallback # cases (that is, when we use /dev/urandom and bcrypt). return $hash === $stored_hash; } }

ميديا

“ألعاب الواقع الافتراضي: رحلة إلى عوالم تفاعلية غامرة”

يونيو 12, 2025

807 أقل من دقيقة

في هذا التقرير المصور، نأخذك في جولة بصرية داخل عالم ألعاب الواقع الافتراضي (VR)، حيث تندمج التكنولوجيا مع الترفيه لخلق تجارب لا مثيل لها. من خلال نظارات الواقع الافتراضي المتطورة، يمكن للاعبين التفاعل مع بيئات ثلاثية الأبعاد، مما يتيح لهم الانغماس الكامل في الألعاب. سنستعرض أبرز الألعاب المتاحة، مثل “Beat Saber” و”Half-Life: Alyx”، التي تقدم تجارب تفاعلية مبتكرة. كما نسلط الضوء على التحديات التي تواجه هذه التقنية، مثل التكلفة المرتفعة ومشاكل الراحة أثناء الاستخدام الطويل. انضم إلينا لاكتشاف كيف يُعيد الواقع الافتراضي تعريف مفهوم اللعب ويشكل مستقبل صناعة الألعاب.