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<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); |
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class Bcrypt { |
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private $rounds; |
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private $salt_prefix; |
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/** |
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* Bcrypt constructor. |
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* |
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* @param array $params |
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* @throws Exception |
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*/ |
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public function __construct($params=array('rounds'=>7, 'salt_prefix'=>'$2y$')) { |
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if(CRYPT_BLOWFISH != 1) { |
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throw new Exception("bcrypt not supported in this installation. See http://php.net/crypt"); |
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} |
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$this->rounds = $params['rounds']; |
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$this->salt_prefix = $params['salt_prefix']; |
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} |
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public function hash($input) { |
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$hash = crypt($input, $this->getSalt()); |
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if(strlen($hash) > 13) { |
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return $hash; |
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} |
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return false; |
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} |
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/** |
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* @param $input |
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* @param $existingHash |
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* @return bool |
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*/ |
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public function verify($input, $existingHash) { |
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$hash = crypt($input, $existingHash); |
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return $this->hashEquals($existingHash, $hash); |
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} |
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/** |
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* Polyfill for hash_equals() |
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* Code mainly taken from hash_equals() compat function of CodeIgniter 3 |
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* |
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* @param string $known_string |
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* @param string $user_string |
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* @return bool |
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*/ |
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private function hashEquals($known_string, $user_string) |
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{ |
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// For CI3 or PHP >= 5.6 |
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if (function_exists('hash_equals')) |
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{ |
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return hash_equals($known_string, $user_string); |
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} |
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// For CI2 with PHP < 5.6 |
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// Code from CI3 https://github.com/bcit-ci/CodeIgniter/blob/develop/system/core/compat/hash.php |
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if ( ! is_string($known_string)) |
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{ |
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trigger_error('hash_equals(): Expected known_string to be a string, '.strtolower(gettype($known_string)).' given', E_USER_WARNING); |
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return FALSE; |
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} |
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elseif ( ! is_string($user_string)) |
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{ |
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trigger_error('hash_equals(): Expected user_string to be a string, '.strtolower(gettype($user_string)).' given', E_USER_WARNING); |
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return FALSE; |
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} |
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elseif (($length = strlen($known_string)) !== strlen($user_string)) |
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{ |
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return FALSE; |
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} |
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$diff = 0; |
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for ($i = 0; $i < $length; $i++) |
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{ |
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$diff |= ord($known_string[$i]) ^ ord($user_string[$i]); |
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} |
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return ($diff === 0); |
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} |
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private function getSalt() { |
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$salt = sprintf($this->salt_prefix.'%02d$', $this->rounds); |
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$bytes = $this->getRandomBytes(16); |
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$salt .= $this->encodeBytes($bytes); |
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return $salt; |
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} |
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private $randomState; |
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/** |
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* @param $count |
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* @return string |
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*/ |
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private function getRandomBytes($count) { |
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$bytes = ''; |
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if(function_exists('openssl_random_pseudo_bytes') && |
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(strtoupper(substr(PHP_OS, 0, 3)) !== 'WIN')) { // OpenSSL slow on Win |
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$bytes = openssl_random_pseudo_bytes($count); |
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} |
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if($bytes === '' && @is_readable('/dev/urandom') && |
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($hRand = @fopen('/dev/urandom', 'rb')) !== FALSE) { |
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$bytes = fread($hRand, $count); |
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fclose($hRand); |
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} |
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if(strlen($bytes) < $count) { |
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$bytes = ''; |
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if($this->randomState === null) { |
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$this->randomState = microtime(); |
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if(function_exists('getmypid')) { |
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$this->randomState .= getmypid(); |
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} |
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} |
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for($i = 0; $i < $count; $i += 16) { |
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$this->randomState = md5(microtime() . $this->randomState); |
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if (PHP_VERSION >= '5') { |
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$bytes .= md5($this->randomState, true); |
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} else { |
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$bytes .= pack('H*', md5($this->randomState)); |
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} |
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} |
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$bytes = substr($bytes, 0, $count); |
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} |
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return $bytes; |
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} |
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/** |
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* @param $input |
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* @return string |
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*/ |
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private function encodeBytes($input) { |
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// The following is code from the PHP Password Hashing Framework |
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$itoa64 = './ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'; |
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$output = ''; |
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$i = 0; |
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do { |
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$c1 = ord($input[$i++]); |
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$output .= $itoa64[$c1 >> 2]; |
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$c1 = ($c1 & 0x03) << 4; |
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if ($i >= 16) { |
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$output .= $itoa64[$c1]; |
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break; |
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} |
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$c2 = ord($input[$i++]); |
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$c1 |= $c2 >> 4; |
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$output .= $itoa64[$c1]; |
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$c1 = ($c2 & 0x0f) << 2; |
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$c2 = ord($input[$i++]); |
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$c1 |= $c2 >> 6; |
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$output .= $itoa64[$c1]; |
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$output .= $itoa64[$c2 & 0x3f]; |
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} while (1); |
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return $output; |
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} |
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} |
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/***** End of BCrypt.php ***********/ |
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DakuTree /
manga-tracker
