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<?php
class Bcrypt {
private $rounds;
public function __construct($rounds = 12) {
global $error;
if(CRYPT_BLOWFISH != 1) {
$error[] = "bcrypt not supported in this installation. See http://php.net/crypt";
}
$this->rounds = $rounds;
}
public function hash($input) {
$hash = crypt($input, $this->getSalt());
if(strlen($hash) > 13)
return $hash;
return false;
}
public function verify($input, $existingHash) {
$hash = crypt($input, $existingHash);
return $hash === $existingHash;
}
private function getSalt() {
$salt = sprintf('$2a$%02d$', $this->rounds);
$bytes = $this->getRandomBytes(16);
$salt .= $this->encodeBytes($bytes);
return $salt;
}
private $randomState;
private function getRandomBytes($count) {
$bytes = '';
if(function_exists('openssl_random_pseudo_bytes') &&
(strtoupper(substr(PHP_OS, 0, 3)) !== 'WIN')) { // OpenSSL slow on Win
$bytes = openssl_random_pseudo_bytes($count);
}
if($bytes === '' && is_readable('/dev/urandom') &&
($hRand = @fopen('/dev/urandom', 'rb')) !== FALSE) {
$bytes = fread($hRand, $count);
fclose($hRand);
}
if(strlen($bytes) < $count) {
$bytes = '';
if($this->randomState === null) {
$this->randomState = microtime();
if(function_exists('getmypid')) {
$this->randomState .= getmypid();
}
}
for($i = 0; $i < $count; $i += 16) {
$this->randomState = md5(microtime() . $this->randomState);
if (PHP_VERSION >= '5') {
$bytes .= md5($this->randomState, true);
} else {
$bytes .= pack('H*', md5($this->randomState));
}
}
$bytes = substr($bytes, 0, $count);
}
return $bytes;
}
private function encodeBytes($input) {
// The following is code from the PHP Password Hashing Framework
$itoa64 = './ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
$output = '';
$i = 0;
do {
$c1 = ord($input[$i++]);
$output .= $itoa64[$c1 >> 2];
$c1 = ($c1 & 0x03) << 4;
if ($i >= 16) {
$output .= $itoa64[$c1];
break;
}
$c2 = ord($input[$i++]);
$c1 |= $c2 >> 4;
$output .= $itoa64[$c1];
$c1 = ($c2 & 0x0f) << 2;
$c2 = ord($input[$i++]);
$c1 |= $c2 >> 6;
$output .= $itoa64[$c1];
$output .= $itoa64[$c2 & 0x3f];
} while (1);
return $output;
}
}
?>