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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Security\Core\Encoder;
use Symfony\Component\Security\Core\Exception\BadCredentialsException;
/**
* Pbkdf2PasswordEncoder uses the PBKDF2 (Password-Based Key Derivation Function 2).
*
* Providing a high level of Cryptographic security,
* PBKDF2 is recommended by the National Institute of Standards and Technology (NIST).
*
* But also warrants a warning, using PBKDF2 (with a high number of iterations) slows down the process.
* PBKDF2 should be used with caution and care.
*
* @author Sebastiaan Stok <s.stok@rollerscapes.net>
* @author Andrew Johnson
* @author Fabien Potencier <fabien@symfony.com>
*/
class Pbkdf2PasswordEncoder extends BasePasswordEncoder
{
private $algorithm;
private $encodeHashAsBase64;
private $iterations;
private $length;
/**
* Constructor.
*
* @param string $algorithm The digest algorithm to use
* @param bool $encodeHashAsBase64 Whether to base64 encode the password hash
* @param int $iterations The number of iterations to use to stretch the password hash
* @param int $length Length of derived key to create
*/
public function __construct($algorithm = 'sha512', $encodeHashAsBase64 = true, $iterations = 1000, $length = 40)
{
$this->algorithm = $algorithm;
$this->encodeHashAsBase64 = $encodeHashAsBase64;
$this->iterations = $iterations;
$this->length = $length;
}
/**
* {@inheritdoc}
*
* @throws \LogicException when the algorithm is not supported
*/
public function encodePassword($raw, $salt)
{
if ($this->isPasswordTooLong($raw)) {
throw new BadCredentialsException('Invalid password.');
}
if (!in_array($this->algorithm, hash_algos(), true)) {
throw new \LogicException(sprintf('The algorithm "%s" is not supported.', $this->algorithm));
}
if (function_exists('hash_pbkdf2')) {
$digest = hash_pbkdf2($this->algorithm, $raw, $salt, $this->iterations, $this->length, true);
} else {
$digest = $this->hashPbkdf2($this->algorithm, $raw, $salt, $this->iterations, $this->length);
}
return $this->encodeHashAsBase64 ? base64_encode($digest) : bin2hex($digest);
}
/**
* {@inheritdoc}
*/
public function isPasswordValid($encoded, $raw, $salt)
{
return !$this->isPasswordTooLong($raw) && $this->comparePasswords($encoded, $this->encodePassword($raw, $salt));
}
private function hashPbkdf2($algorithm, $password, $salt, $iterations, $length = 0)
{
// Number of blocks needed to create the derived key
$blocks = ceil($length / strlen(hash($algorithm, null, true)));
$digest = '';
for ($i = 1; $i <= $blocks; ++$i) {
$ib = $block = hash_hmac($algorithm, $salt.pack('N', $i), $password, true);
// Iterations
for ($j = 1; $j < $iterations; ++$j) {
$ib ^= ($block = hash_hmac($algorithm, $block, $password, true));
}
$digest .= $ib;
}
return substr($digest, 0, $this->length);
}
}
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