114 lines
2.7 KiB
PHP
Executable File
114 lines
2.7 KiB
PHP
Executable File
<?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 $salt_prefix;
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public function __construct($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 $hash;
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return false;
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}
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public function verify($input, $existingHash) {
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$hash = crypt($input, $existingHash);
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return $hash === $existingHash;
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}
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private function getSalt() {
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$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 $randomState;
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private function getRandomBytes($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 $bytes;
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}
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private function encodeBytes($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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