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signaturepdf/vendor/fatfree/bcrypt.php

97 lines
2.4 KiB
PHP

<?php
/**
* Copyright (c) 2009-2019 F3::Factory/Bong Cosca, All rights reserved.
*
* This file is part of the Fat-Free Framework (http://fatfreeframework.com).
*
* This is free software: you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or later.
*
* Fat-Free Framework is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with Fat-Free Framework. If not, see <http://www.gnu.org/licenses/>.
*
**/
/**
* Lightweight password hashing library (PHP 5.5+ only)
* @deprecated Use http://php.net/manual/en/ref.password.php instead
**/
class Bcrypt extends Prefab {
//@{ Error messages
const
E_CostArg='Invalid cost parameter',
E_SaltArg='Salt must be at least 22 alphanumeric characters';
//@}
//! Default cost
const
COST=10;
/**
* Generate bcrypt hash of string
* @return string|FALSE
* @param $pw string
* @param $salt string
* @param $cost int
**/
function hash($pw,$salt=NULL,$cost=self::COST) {
if ($cost<4 || $cost>31)
user_error(self::E_CostArg,E_USER_ERROR);
$len=22;
if ($salt) {
if (!preg_match('/^[[:alnum:]\.\/]{'.$len.',}$/',$salt))
user_error(self::E_SaltArg,E_USER_ERROR);
}
else {
$raw=16;
$iv='';
if (!$iv && extension_loaded('openssl'))
$iv=openssl_random_pseudo_bytes($raw);
if (!$iv)
for ($i=0;$i<$raw;++$i)
$iv.=chr(mt_rand(0,255));
$salt=str_replace('+','.',base64_encode($iv));
}
$salt=substr($salt,0,$len);
$hash=crypt($pw,sprintf('$2y$%02d$',$cost).$salt);
return strlen($hash)>13?$hash:FALSE;
}
/**
* Check if password is still strong enough
* @return bool
* @param $hash string
* @param $cost int
**/
function needs_rehash($hash,$cost=self::COST) {
list($pwcost)=sscanf($hash,"$2y$%d$");
return $pwcost<$cost;
}
/**
* Verify password against hash using timing attack resistant approach
* @return bool
* @param $pw string
* @param $hash string
**/
function verify($pw,$hash) {
$val=crypt($pw,$hash);
$len=strlen($val);
if ($len!=strlen($hash) || $len<14)
return FALSE;
$out=0;
for ($i=0;$i<$len;++$i)
$out|=(ord($val[$i])^ord($hash[$i]));
return $out===0;
}
}