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<?php /** * @package FrameworkOnFramework * @subpackage Encryption * @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 VDM) and no longer reflects the original work of its author. * @depreciation This was ported for the sake of those who have stuff encrypted with the FOF encryption suite. * - Do not use this in new projects. * - Expect no updates. * - This is outdated. * - Not best choice for encryption. * - Use phpseclib/phpseclib version 3 Instead. * - Checkout the JCB Crypt Suite. <https://git.vdm.dev/joomla/phpseclib> */ namespace VDM\Joomla\FOF\Encrypt\AES; /** * Abstract AES encryption class * * @package FrameworkOnFramework * @since 1.0 * @deprecated Use phpseclib/phpseclib version 3 Instead. */ abstract class Abstraction { /** * Trims or zero-pads a key / IV * * @param string $key The key or IV to treat * @param int $size The block size of the currently used algorithm * * @return null|string Null if $key is null, treated string of $size byte length otherwise */ public function resizeKey($key, $size) { if (empty($key)) { return null; } $keyLength = strlen($key); if (function_exists('mb_strlen')) { $keyLength = mb_strlen($key, 'ASCII'); } if ($keyLength == $size) { return $key; } if ($keyLength > $size) { if (function_exists('mb_substr')) { return mb_substr($key, 0, $size, 'ASCII'); } return substr($key, 0, $size); } return $key . str_repeat("\0", ($size - $keyLength)); } /** * Returns null bytes to append to the string so that it's zero padded to the specified block size * * @param string $string The binary string which will be zero padded * @param int $blockSize The block size * * @return string The zero bytes to append to the string to zero pad it to $blockSize */ protected function getZeroPadding($string, $blockSize) { $stringSize = strlen($string); if (function_exists('mb_strlen')) { $stringSize = mb_strlen($string, 'ASCII'); } if ($stringSize == $blockSize) { return ''; } if ($stringSize < $blockSize) { return str_repeat("\0", $blockSize - $stringSize); } $paddingBytes = $stringSize % $blockSize; return str_repeat("\0", $blockSize - $paddingBytes); } }
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