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<?php
/**
* @file classes/security/Hashing.inc.php
*
* Copyright (c) 2013-2019 Simon Fraser University
* Copyright (c) 2003-2019 John Willinsky
* Distributed under the GNU GPL v2. For full terms see the file docs/COPYING.
*
* @class Hashing
* @ingroup security
*
* @brief Class providing password hashing operations.
* @see https://github.com/ircmaxell/password_compat
*/
class Hashing {
/**
* Verify the hash is correct
*
* @param $password plain-text password
* @param $hash hashed string
* @return boolean
*/
function isValid($password, $hash) {
if (Hashing::isSupported()) {
return password_verify($password, $hash);
}
return false;
}
/**
* Does this password require rehashing
*
* @param $hash string
* @return boolean
**/
function needsRehash($hash) {
if (Hashing::isSupported()) {
return password_needs_rehash($hash, PASSWORD_BCRYPT);
}
return false;
}
/**
* Get hash for string
*
* @param $string string
* @return string|false
*/
function getHash($string) {
if (Hashing::isSupported()) {
return password_hash($string, PASSWORD_BCRYPT);
}
return false;
}
/**
* Is password library supported?
*
* @return boolean
*/
function isSupported() {
static $supported;
if ($supported === null) {
$supported = false;
if (Hashing::initialize()) {
/**
* Check if current PHP version is compatible with the library
*
* taken from PasswordCompat\binary\check()
*
* we can't use that directly because namespaces may not be supported
* which will cause a syntax error
*/
if (function_exists('crypt')) {
$hash = '$2y$04$usesomesillystringfore7hnbRJHxXVLeakoG8K30oukPsA.ztMG';
$supported = (crypt("password", $hash) == $hash);
}
}
}
return $supported;
}
/**
* Load hashing library (if supported)
*
* @return boolean
*/
function initialize() {
static $init;
if ($init === null) {
// password_compat uses namespaces, so ensure PHP version supports this
if (version_compare(phpversion(), '5.3.0', '>=')) {
$init = require_once(BASE_SYS_DIR . '/lib/password_compat/lib/password.php');
}
else {
$init = false;
}
}
return $init;
}
}