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MessageDigestPasswordHasher.php
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MessageDigestPasswordHasher.php
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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\PasswordHasher\Hasher;
use Symfony\Component\PasswordHasher\Exception\InvalidPasswordException;
use Symfony\Component\PasswordHasher\Exception\LogicException;
use Symfony\Component\PasswordHasher\LegacyPasswordHasherInterface;
/**
* MessageDigestPasswordHasher uses a message digest algorithm.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class MessageDigestPasswordHasher implements LegacyPasswordHasherInterface
{
use CheckPasswordLengthTrait;
private $algorithm;
private $encodeHashAsBase64;
private $iterations = 1;
private $hashLength = -1;
/**
* @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(string $algorithm = 'sha512', bool $encodeHashAsBase64 = true, int $iterations = 5000)
{
$this->algorithm = $algorithm;
$this->encodeHashAsBase64 = $encodeHashAsBase64;
try {
$this->hashLength = \strlen($this->hash('', 'salt'));
} catch (\LogicException $e) {
// ignore algorithm not supported
}
$this->iterations = $iterations;
}
public function hash(string $plainPassword, string $salt = null): string
{
if ($this->isPasswordTooLong($plainPassword)) {
throw new InvalidPasswordException();
}
if (!\in_array($this->algorithm, hash_algos(), true)) {
throw new LogicException(sprintf('The algorithm "%s" is not supported.', $this->algorithm));
}
$salted = $this->mergePasswordAndSalt($plainPassword, $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);
}
public function verify(string $hashedPassword, string $plainPassword, string $salt = null): bool
{
if (\strlen($hashedPassword) !== $this->hashLength || false !== strpos($hashedPassword, '$')) {
return false;
}
return !$this->isPasswordTooLong($plainPassword) && hash_equals($hashedPassword, $this->hash($plainPassword, $salt));
}
public function needsRehash(string $hashedPassword): bool
{
return false;
}
private function mergePasswordAndSalt(string $password, ?string $salt): string
{
if (!$salt) {
return $password;
}
if (false !== strrpos($salt, '{') || false !== strrpos($salt, '}')) {
throw new \InvalidArgumentException('Cannot use { or } in salt.');
}
return $password.'{'.$salt.'}';
}
}