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name : BCryptPasswordEncoder.php
 <?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;

/**
 * @author Elnur Abdurrakhimov <elnur@elnur.pro>
 * @author Terje Bråten <terje@braten.be>
 */
class BCryptPasswordEncoder extends BasePasswordEncoder
{
    /**
     * @var string
     */
    private $cost;

    /**
     * Constructor.
     *
     * @param integer $cost The algorithmic cost that should be used
     *
     * @throws \RuntimeException When no BCrypt encoder is available
     * @throws \InvalidArgumentException if cost is out of range
     */
    public function __construct($cost)
    {
        if (!function_exists('password_hash')) {
            throw new \RuntimeException('To use the BCrypt encoder, you need to upgrade to PHP 5.5 or install the "ircmaxell/password-compat" via Composer.');
        }

        $cost = (int) $cost;
        if ($cost < 4 || $cost > 31) {
            throw new \InvalidArgumentException('Cost must be in the range of 4-31.');
        }

        $this->cost = $cost;
    }

    /**
     * Encodes the raw password.
     *
     * It doesn't work with PHP versions lower than 5.3.7, since
     * the password compat library uses CRYPT_BLOWFISH hash type with
     * the "$2y$" salt prefix (which is not available in the early PHP versions).
     * @see https://github.com/ircmaxell/password_compat/issues/10#issuecomment-11203833
     *
     * It is almost best to **not** pass a salt and let PHP generate one for you.
     *
     * @param string $raw  The password to encode
     * @param string $salt The salt
     *
     * @return string The encoded password
     *
     * @link http://lxr.php.net/xref/PHP_5_5/ext/standard/password.c#111
     */
    public function encodePassword($raw, $salt)
    {
        if ($this->isPasswordTooLong($raw)) {
            throw new BadCredentialsException('Invalid password.');
        }

        $options = array('cost' => $this->cost);

        if ($salt) {
            $options['salt'] = $salt;
        }

        return password_hash($raw, PASSWORD_BCRYPT, $options);
    }

    /**
     * {@inheritdoc}
     */
    public function isPasswordValid($encoded, $raw, $salt)
    {
        return !$this->isPasswordTooLong($raw) && password_verify($raw, $encoded);
    }
}
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