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Filename :
Pbkdf2PasswordEncoder.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\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 Boolean $encodeHashAsBase64 Whether to base64 encode the password hash * @param integer $iterations The number of iterations to use to stretch the password hash * @param integer $length Length of derived key to create */ public function __construct($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); } }