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<?php

/**

 * CodeIgniter

 *

 * An open source application development framework for PHP

 *

 * This content is released under the MIT License (MIT)

 *

 * Copyright (c) 2014 - 2019, British Columbia Institute of Technology

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 *

 * @package	CodeIgniter

 * @author	EllisLab Dev Team

 * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)

 * @copyright	Copyright (c) 2014 - 2019, British Columbia Institute of Technology (https://bcit.ca/)

 * @license	https://opensource.org/licenses/MIT	MIT License

 * @link	https://codeigniter.com

 * @since	Version 3.0.0

 * @filesource

 */

defined('BASEPATH') OR exit('No direct script access allowed');

/**

 * PHP ext/standard/password compatibility package

 *

 * @package		CodeIgniter

 * @subpackage	CodeIgniter

 * @category	Compatibility

 * @author		Andrey Andreev

 * @link		https://codeigniter.com/user_guide/

 * @link		http://php.net/password

 */

// ------------------------------------------------------------------------

if (is_php('5.5') OR ! defined('CRYPT_BLOWFISH') OR CRYPT_BLOWFISH !== 1 OR defined('HHVM_VERSION'))

{

	return;

}

// ------------------------------------------------------------------------

defined('PASSWORD_BCRYPT') OR define('PASSWORD_BCRYPT', 1);

defined('PASSWORD_DEFAULT') OR define('PASSWORD_DEFAULT', PASSWORD_BCRYPT);

// ------------------------------------------------------------------------

if ( ! function_exists('password_get_info'))

{

	/**

	 * password_get_info()

	 *

	 * @link	http://php.net/password_get_info

	 * @param	string	$hash

	 * @return	array

	 */

	function password_get_info($hash)

	{

		return (strlen($hash) < 60 OR sscanf($hash, '$2y$%d', $hash) !== 1)

			? array('algo' => 0, 'algoName' => 'unknown', 'options' => array())

			: array('algo' => 1, 'algoName' => 'bcrypt', 'options' => array('cost' => $hash));

	}

}

// ------------------------------------------------------------------------

if ( ! function_exists('password_hash'))

{

	/**

	 * password_hash()

	 *

	 * @link	http://php.net/password_hash

	 * @param	string	$password

	 * @param	int	$algo

	 * @param	array	$options

	 * @return	mixed

	 */

	function password_hash($password, $algo, array $options = array())

	{

		static $func_overload;

		isset($func_overload) OR $func_overload = (extension_loaded('mbstring') && ini_get('mbstring.func_overload'));

		if ($algo !== 1)

		{

			trigger_error('password_hash(): Unknown hashing algorithm: '.(int) $algo, E_USER_WARNING);

			return NULL;

		}

		if (isset($options['cost']) && ($options['cost'] < 4 OR $options['cost'] > 31))

		{

			trigger_error('password_hash(): Invalid bcrypt cost parameter specified: '.(int) $options['cost'], E_USER_WARNING);

			return NULL;

		}

		if (isset($options['salt']) && ($saltlen = ($func_overload ? mb_strlen($options['salt'], '8bit') : strlen($options['salt']))) < 22)

		{

			trigger_error('password_hash(): Provided salt is too short: '.$saltlen.' expecting 22', E_USER_WARNING);

			return NULL;

		}

		elseif ( ! isset($options['salt']))

		{

			if (function_exists('random_bytes'))

			{

				try

				{

					$options['salt'] = random_bytes(16);

				}

				catch (Exception $e)

				{

					log_message('error', 'compat/password: Error while trying to use random_bytes(): '.$e->getMessage());

					return FALSE;

				}

			}

			elseif (defined('MCRYPT_DEV_URANDOM'))

			{

				$options['salt'] = mcrypt_create_iv(16, MCRYPT_DEV_URANDOM);

			}

			elseif (DIRECTORY_SEPARATOR === '/' && (is_readable($dev = '/dev/arandom') OR is_readable($dev = '/dev/urandom')))

			{

				if (($fp = fopen($dev, 'rb')) === FALSE)

				{

					log_message('error', 'compat/password: Unable to open '.$dev.' for reading.');

					return FALSE;

				}

				// Try not to waste entropy ...

				is_php('5.4') && stream_set_chunk_size($fp, 16);

				$options['salt'] = '';

				for ($read = 0; $read < 16; $read = ($func_overload) ? mb_strlen($options['salt'], '8bit') : strlen($options['salt']))

				{

					if (($read = fread($fp, 16 - $read)) === FALSE)

					{

						log_message('error', 'compat/password: Error while reading from '.$dev.'.');

						return FALSE;

					}

					$options['salt'] .= $read;

				}

				fclose($fp);

			}

			elseif (function_exists('openssl_random_pseudo_bytes'))

			{

				$is_secure = NULL;

				$options['salt'] = openssl_random_pseudo_bytes(16, $is_secure);

				if ($is_secure !== TRUE)

				{

					log_message('error', 'compat/password: openssl_random_pseudo_bytes() set the $cryto_strong flag to FALSE');

					return FALSE;

				}

			}

			else

			{

				log_message('error', 'compat/password: No CSPRNG available.');

				return FALSE;

			}

			$options['salt'] = str_replace('+', '.', rtrim(base64_encode($options['salt']), '='));

		}

		elseif ( ! preg_match('#^[a-zA-Z0-9./]+$#D', $options['salt']))

		{

			$options['salt'] = str_replace('+', '.', rtrim(base64_encode($options['salt']), '='));

		}

		isset($options['cost']) OR $options['cost'] = 10;

		return (strlen($password = crypt($password, sprintf('$2y$%02d$%s', $options['cost'], $options['salt']))) === 60)

			? $password

			: FALSE;

	}

}

// ------------------------------------------------------------------------

if ( ! function_exists('password_needs_rehash'))

{

	/**

	 * password_needs_rehash()

	 *

	 * @link	http://php.net/password_needs_rehash

	 * @param	string	$hash

	 * @param	int	$algo

	 * @param	array	$options

	 * @return	bool

	 */

	function password_needs_rehash($hash, $algo, array $options = array())

	{

		$info = password_get_info($hash);

		if ($algo !== $info['algo'])

		{

			return TRUE;

		}

		elseif ($algo === 1)

		{

			$options['cost'] = isset($options['cost']) ? (int) $options['cost'] : 10;

			return ($info['options']['cost'] !== $options['cost']);

		}

		// Odd at first glance, but according to a comment in PHP's own unit tests,

		// because it is an unknown algorithm - it's valid and therefore doesn't

		// need rehashing.

		return FALSE;

	}

}

// ------------------------------------------------------------------------

if ( ! function_exists('password_verify'))

{

	/**

	 * password_verify()

	 *

	 * @link	http://php.net/password_verify

	 * @param	string	$password

	 * @param	string	$hash

	 * @return	bool

	 */

	function password_verify($password, $hash)

	{

		if (strlen($hash) !== 60 OR strlen($password = crypt($password, $hash)) !== 60)

		{

			return FALSE;

		}

		$compare = 0;

		for ($i = 0; $i < 60; $i++)

		{

			$compare |= (ord($password[$i]) ^ ord($hash[$i]));

		}

		return ($compare === 0);

	}

}