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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;
/**
* MessageDigestPasswordEncoder uses a message digest algorithm.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class MessageDigestPasswordEncoder extends BasePasswordEncoder
{
private $algorithm;
private $encodeHashAsBase64;
private $iterations;
/**
* Constructor.
*
* @param string $algorithm The digest algorithm to use
* @param bool $encodeHashAsBase64 Whether to base64 encode the password hash
* @param int $iterations The number of iterations to use to stretch the password hash
*/
public function __construct($algorithm = 'sha512', $encodeHashAsBase64 = true, $iterations = 5000)
{
$this->algorithm = $algorithm;
$this->encodeHashAsBase64 = $encodeHashAsBase64;
$this->iterations = $iterations;
}
/**
* {@inheritdoc}
*/
public function encodePassword($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));
}
$salted = $this->mergePasswordAndSalt($raw, $salt);
$digest = hash($this->algorithm, $salted, true);
// "stretch" hash
for ($i = 1; $i < $this->iterations; ++$i) {
$digest = hash($this->algorithm, $digest.$salted, true);
}
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));
}
}
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