Created
October 23, 2011 00:25
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sample Bcrypt class for php
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<?php | |
/* | |
* | |
// seen on | |
// http://stackoverflow.com/questions/4795385/how-do-you-use-bcrypt-for-hashing-passwords-in-php/6337021#6337021 | |
// usage | |
$bcrypt = new Bcrypt(15); | |
$hash = $bcrypt->hash('password'); | |
$isGood = $bcrypt->verify('password', $hash); | |
*/ | |
class Bcrypt { | |
private $rounds; | |
public function __construct($rounds = 12) { | |
if(CRYPT_BLOWFISH != 1) { | |
throw new Exception("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; | |
} | |
} |
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