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<?php
/**
 * @package     FrameworkOnFramework
 * @subpackage  utils
 * @copyright   Copyright (C) 2010-2016 Nicholas K. Dionysopoulos / Akeeba Ltd. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 * @note        This file has been modified by the Joomla! Project and no longer reflects the original work of its author.
 */

// Protect from unauthorized access
defined('FOF_INCLUDED') or die;

/**
 * Generates cryptographically-secure random values.
 */
class FOFEncryptRandval implements FOFEncryptRandvalinterface
{
	/**
	 * Returns a cryptographically secure random value.
	 *
	 * Since we only run on PHP 7+ we can use random_bytes(), which internally uses a crypto safe PRNG. If the function
	 * doesn't exist, Joomla already loads a secure polyfill.
	 *
	 * The reason this method exists is backwards compatibility with older versions of FOF. It also allows us to quickly
	 * address any future issues if Joomla drops the polyfill or otherwise find problems with PHP's random_bytes() on
	 * some weird host (you can't be too careful when releasing mass-distributed software).
	 *
	 * @param   integer  $bytes  How many bytes to return
	 *
	 * @return  string
	 */
	public function generate($bytes = 32)
	{
		return random_bytes($bytes);
	}

	/**
	 * Generate random bytes. Adapted from Joomla! 3.2.
	 *
	 * Since we only run on PHP 7+ we can use random_bytes(), which internally uses a crypto safe PRNG. If the function
	 * doesn't exist, Joomla already loads a secure polyfill.
	 *
	 * The reason this method exists is backwards compatibility with older versions of FOF. It also allows us to quickly
	 * address any future issues if Joomla drops the polyfill or otherwise find problems with PHP's random_bytes() on
	 * some weird host (you can't be too careful when releasing mass-distributed software).
	 *
	 * @param   integer  $length  Length of the random data to generate
	 *
	 * @return  string  Random binary data
	 */
	public function genRandomBytes($length = 32)
	{
		return random_bytes($length);
	}
}