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<?php |
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defined('ROOT_PATH') || exit('Access denied'); |
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/** |
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* TNH Framework |
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* |
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* A simple PHP framework using HMVC architecture |
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* |
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* This content is released under the MIT License (MIT) |
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* |
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* Copyright (c) 2017 TNH Framework |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
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* in the Software without restriction, including without limitation the rights |
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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* copies of the Software, and to permit persons to whom the Software is |
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* furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in all |
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* copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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* SOFTWARE. |
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*/ |
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class StringHash { |
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/** |
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* Using blowfish method |
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* CRYPT_BLOWFISH = 1 |
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* Recommended algo since PHP 5.3.7 is "$2y$" |
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* Before PHP 5.3.7 can use "$2a$" but this have some security issue |
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* @see http://www.php.net/security/crypt_blowfish.php |
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* @var string |
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*/ |
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private static $algo = '$2y$'; |
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/** |
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* Cost parameter value |
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* For CRYPT_BLOWFISH possible value are: "04", "05", "06", "07", "08", "09", "10", etc. until |
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* "30", "31" |
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* |
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* @var string |
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*/ |
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private static $cost = '10'; |
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/** |
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* Hash the given string |
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* @param string $value the plain string text to be hashed |
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* |
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* @return string the hashed string |
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*/ |
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public function hash($value) { |
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return crypt($value, self::$algo . |
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self::$cost . |
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'$' . $this->getUniqueSalt()); |
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} |
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/** |
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* Check if the hash and plain string is valid |
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* @param string $hash the hashed string |
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* @param string $plain the plain text |
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* |
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* @return boolean true if is valid or false if not |
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*/ |
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public function check($hash, $plain) { |
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$fullSalt = substr($hash, 0, 29); |
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$newHash = crypt($plain, $fullSalt); |
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return $hash === $newHash; |
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} |
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/** |
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* Get the unique salt for the string hash |
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* Note: extension openssl need to be available for this to work |
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* |
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* @return string the unique generated salt |
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*/ |
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private function getUniqueSalt() { |
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/* To generate the salt, first generate enough random bytes. Because |
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* base64 returns one character for each 6 bits, so we should generate |
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* at least 22*6/8 = 16.5 bytes, so we generate 17 bytes. Then we get the first |
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* 22 base64 characters |
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*/ |
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/* As blowfish takes a salt with the alphabet ./A-Za-z0-9 we have to |
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* replace any '+', '=' in the base64 string with '..'. |
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*/ |
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$random = base64_encode(openssl_random_pseudo_bytes(17)); |
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//take only the first 22 caracters |
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$random = substr($random, 0, 22); |
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//replace +,= by . |
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return strtr($random, '+=', '..'); |
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} |
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} |
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tnhfw /
tnh-fw
