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AdapterInterface.php 0000604 00000005015 15245561505 0010463 0 ustar 00 <?php /** * @package FOF * @copyright Copyright (c)2010-2020 Nicholas K. Dionysopoulos / Akeeba Ltd * @license GNU General Public License version 2, or later */ namespace FOF30\Encrypt\AesAdapter; defined('_JEXEC') || die; use FOF30\Utils\Phpfunc; /** * Interface for AES encryption adapters */ interface AdapterInterface { /** * Sets the AES encryption mode. * * WARNING: The strength parameter is deprecated since FOF 3.1 and has no effect. * * @param string $mode Choose between CBC (recommended) or ECB * @param int $strength DEPRECATED AND UNUSED. * * @return mixed */ public function setEncryptionMode($mode = 'cbc', $strength = 128); /** * Encrypts a string. Returns the raw binary ciphertext. * * WARNING: The plaintext is zero-padded to the algorithm's block size. You are advised to store the size of the * plaintext and trim the string to that length upon decryption. * * @param string $plainText The plaintext to encrypt * @param string $key The raw binary key (will be zero-padded or chopped if its size is different * than the block size) * @param null|string $iv The initialization vector (for CBC mode algorithms) * * @return string The raw encrypted binary string. */ public function encrypt($plainText, $key, $iv = null); /** * Decrypts a string. Returns the raw binary plaintext. * * $ciphertext MUST start with the IV followed by the ciphertext, even for EBC data (the first block of data is * dropped in EBC mode since there is no concept of IV in EBC). * * WARNING: The returned plaintext is zero-padded to the algorithm's block size during encryption. You are advised * to trim the string to the original plaintext's length upon decryption. While rtrim($decrypted, "\0") sounds * appealing it's NOT the correct approach for binary data (zero bytes may actually be part of your plaintext, not * just padding!). * * @param string $cipherText The ciphertext to encrypt * @param string $key The raw binary key (will be zero-padded or chopped if its size is different than * the block size) * * @return string The raw unencrypted binary string. */ public function decrypt($cipherText, $key); /** * Returns the encryption block size in bytes * * @return int */ public function getBlockSize(); /** * Is this adapter supported? * * @return bool */ public function isSupported(Phpfunc $phpfunc = null); } OpenSSL.php 0000604 00000010231 15245561505 0006541 0 ustar 00 <?php /** * @package FOF * @copyright Copyright (c)2010-2020 Nicholas K. Dionysopoulos / Akeeba Ltd * @license GNU General Public License version 2, or later */ namespace FOF30\Encrypt\AesAdapter; defined('_JEXEC') || die; use FOF30\Encrypt\Randval; use FOF30\Utils\Phpfunc; class OpenSSL extends AbstractAdapter implements AdapterInterface { /** * The OpenSSL options for encryption / decryption * * PHP 5.3 does not have the constants OPENSSL_RAW_DATA and OPENSSL_ZERO_PADDING. In fact, the parameter * is called $raw_data and is a boolean. Since integer 1 is equivalent to boolean TRUE in PHP we can get * away with initializing this parameter with the integer 1. * * @var int */ protected $openSSLOptions = 1; /** * The encryption method to use * * @var string */ protected $method = 'aes-128-cbc'; public function __construct() { /** * PHP 5.4 and later replaced the $raw_data parameter with the $options parameter. Instead of a boolean we need * to pass some flags. Here you go. * * Since PHP 5.3 does NOT have the relevant constants we must NOT run this bit of code under PHP 5.3. * * See http://stackoverflow.com/questions/24707007/using-openssl-raw-data-param-in-openssl-decrypt-with-php-5-3#24707117 */ if (version_compare(PHP_VERSION, '5.4.0', 'ge')) { $this->openSSLOptions = OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING; } } public function setEncryptionMode($mode = 'cbc', $strength = 128) { static $availableAlgorithms = null; static $defaultAlgo = 'aes-128-cbc'; if (!is_array($availableAlgorithms)) { $availableAlgorithms = openssl_get_cipher_methods(); foreach ([ 'aes-256-cbc', 'aes-256-ecb', 'aes-192-cbc', 'aes-192-ecb', 'aes-128-cbc', 'aes-128-ecb', ] as $algo) { if (in_array($algo, $availableAlgorithms)) { $defaultAlgo = $algo; break; } } } $strength = (int) $strength; $mode = strtolower($mode); if (!in_array($strength, [128, 192, 256])) { $strength = 256; } if (!in_array($mode, ['cbc', 'ebc'])) { $mode = 'cbc'; } $algo = 'aes-' . $strength . '-' . $mode; if (!in_array($algo, $availableAlgorithms)) { $algo = $defaultAlgo; } $this->method = $algo; } public function encrypt($plainText, $key, $iv = null) { $iv_size = $this->getBlockSize(); $key = $this->resizeKey($key, $iv_size); $iv = $this->resizeKey($iv, $iv_size); if (empty($iv)) { $randVal = new Randval(); $iv = $randVal->generate($iv_size); } $plainText .= $this->getZeroPadding($plainText, $iv_size); $cipherText = openssl_encrypt($plainText, $this->method, $key, $this->openSSLOptions, $iv); $cipherText = $iv . $cipherText; return $cipherText; } public function decrypt($cipherText, $key) { $iv_size = $this->getBlockSize(); $key = $this->resizeKey($key, $iv_size); $iv = substr($cipherText, 0, $iv_size); $cipherText = substr($cipherText, $iv_size); $plainText = openssl_decrypt($cipherText, $this->method, $key, $this->openSSLOptions, $iv); return $plainText; } public function isSupported(Phpfunc $phpfunc = null) { if (!is_object($phpfunc) || !($phpfunc instanceof $phpfunc)) { $phpfunc = new Phpfunc(); } if (!$phpfunc->function_exists('openssl_get_cipher_methods')) { return false; } if (!$phpfunc->function_exists('openssl_random_pseudo_bytes')) { return false; } if (!$phpfunc->function_exists('openssl_cipher_iv_length')) { return false; } if (!$phpfunc->function_exists('openssl_encrypt')) { return false; } if (!$phpfunc->function_exists('openssl_decrypt')) { return false; } if (!$phpfunc->function_exists('hash')) { return false; } if (!$phpfunc->function_exists('hash_algos')) { return false; } $algorightms = $phpfunc->openssl_get_cipher_methods(); if (!in_array('aes-128-cbc', $algorightms)) { return false; } $algorightms = $phpfunc->hash_algos(); if (!in_array('sha256', $algorightms)) { return false; } return true; } /** * @return int */ public function getBlockSize() { return openssl_cipher_iv_length($this->method); } } AbstractAdapter.php 0000604 00000003450 15245561505 0010327 0 ustar 00 <?php /** * @package FOF * @copyright Copyright (c)2010-2020 Nicholas K. Dionysopoulos / Akeeba Ltd * @license GNU General Public License version 2, or later */ namespace FOF30\Encrypt\AesAdapter; defined('_JEXEC') || die; /** * Abstract AES encryption class */ abstract class AbstractAdapter { /** * 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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