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<?php
namespace Laminas\Crypt\Symmetric;
use Laminas\Stdlib\ArrayUtils;
use Psr\Container\ContainerInterface;
use Traversable;
use function array_push;
use function class_exists;
use function extension_loaded;
use function get_class;
use function gettype;
use function in_array;
use function is_array;
use function is_int;
use function is_object;
use function is_string;
use function is_subclass_of;
use function mb_strlen;
use function mb_substr;
use function openssl_cipher_iv_length;
use function openssl_decrypt;
use function openssl_encrypt;
use function openssl_error_string;
use function openssl_get_cipher_methods;
use function sprintf;
use function strtolower;
use const OPENSSL_RAW_DATA;
use const OPENSSL_ZERO_PADDING;
use const PHP_VERSION_ID;
/**
* Symmetric encryption using the OpenSSL extension
*
* NOTE: DO NOT USE only this class to encrypt data.
* This class doesn't provide authentication and integrity check over the data.
* PLEASE USE Laminas\Crypt\BlockCipher instead!
*/
class Openssl implements SymmetricInterface
{
public const DEFAULT_PADDING = 'pkcs7';
/**
* Key
*
* @var string
*/
protected $key;
/**
* IV
*
* @var string
*/
protected $iv;
/**
* Encryption algorithm
*
* @var string
*/
protected $algo = 'aes';
/**
* Encryption mode
*
* @var string
*/
protected $mode = 'cbc';
/**
* Padding
*
* @var Padding\PaddingInterface
*/
protected $padding;
/**
* Padding plugins
*
* @var ContainerInterface
*/
protected static $paddingPlugins;
/**
* The encryption algorithms to support
*
* @var array
*/
protected $encryptionAlgos = [
'aes' => 'aes-256',
'blowfish' => 'bf',
'des' => 'des',
'camellia' => 'camellia-256',
'cast5' => 'cast5',
'seed' => 'seed',
];
/**
* Encryption modes to support
*
* @var array
*/
protected $encryptionModes = [
'cbc',
'cfb',
'ofb',
'ecb',
'ctr',
];
/**
* Block sizes (in bytes) for each supported algorithm
*
* @var array
*/
protected $blockSizes = [
'aes' => 16,
'blowfish' => 8,
'des' => 8,
'camellia' => 16,
'cast5' => 8,
'seed' => 16,
];
/**
* Key sizes (in bytes) for each supported algorithm
*
* @var array
*/
protected $keySizes = [
'aes' => 32,
'blowfish' => 56,
'des' => 8,
'camellia' => 32,
'cast5' => 16,
'seed' => 16,
];
/**
* The OpenSSL supported encryption algorithms
*
* @var array
*/
protected $opensslAlgos = [];
/**
* Additional authentication data (only for PHP 7.1+)
*
* @var string
*/
protected $aad = '';
/**
* Store the tag for authentication (only for PHP 7.1+)
*
* @var string
*/
protected $tag;
/**
* Tag size for authenticated encryption modes (only for PHP 7.1+)
*
* @var int
*/
protected $tagSize = 16;
/**
* Supported algorithms
*
* @internal This property was declared for compatibility with PHP 8.2,
* and is not supposed to be used directly, other than for BC reasons
*
* @var list<string>
*/
public $supportedAlgos;
/**
* Constructor
*
* @param array|Traversable $options
* @throws Exception\RuntimeException
* @throws Exception\InvalidArgumentException
*/
public function __construct($options = [])
{
if (! extension_loaded('openssl')) {
throw new Exception\RuntimeException(sprintf(
'You cannot use %s without the OpenSSL extension',
self::class
));
}
// Add the GCM and CCM modes for PHP 7.1+
if (PHP_VERSION_ID >= 70100) {
array_push($this->encryptionModes, 'gcm', 'ccm');
}
$this->setOptions($options);
$this->setDefaultOptions($options);
}
/**
* Set default options
*
* @param array $options
* @return void
* @throws Exception\RuntimeException
* @throws Exception\InvalidArgumentException
*/
public function setOptions($options)
{
if (empty($options)) {
return;
}
if ($options instanceof Traversable) {
$options = ArrayUtils::iteratorToArray($options);
}
if (! is_array($options)) {
throw new Exception\InvalidArgumentException(
'The options parameter must be an array or a Traversable'
);
}
// The algorithm case is not included in the switch because must be
// set before the others
if (isset($options['algo'])) {
$this->setAlgorithm($options['algo']);
} elseif (isset($options['algorithm'])) {
$this->setAlgorithm($options['algorithm']);
}
foreach ($options as $key => $value) {
switch (strtolower($key)) {
case 'mode':
$this->setMode($value);
break;
case 'key':
$this->setKey($value);
break;
case 'iv':
case 'salt':
$this->setSalt($value);
break;
case 'padding':
$plugins = static::getPaddingPluginManager();
$padding = $plugins->get($value);
$this->padding = $padding;
break;
case 'aad':
$this->setAad($value);
break;
case 'tag_size':
$this->setTagSize($value);
break;
}
}
}
/**
* Set default options
*
* @param array $options
* @return void
*/
protected function setDefaultOptions($options = [])
{
if (isset($options['padding'])) {
return;
}
$plugins = static::getPaddingPluginManager();
$padding = $plugins->get(self::DEFAULT_PADDING);
$this->padding = $padding;
}
/**
* Returns the padding plugin manager.
*
* Creates one if none is present.
*
* @return ContainerInterface
*/
public static function getPaddingPluginManager()
{
if (static::$paddingPlugins === null) {
self::setPaddingPluginManager(new PaddingPluginManager());
}
return static::$paddingPlugins;
}
/**
* Set the padding plugin manager
*
* @param string|ContainerInterface $plugins
* @throws Exception\InvalidArgumentException
* @return void
*/
public static function setPaddingPluginManager($plugins)
{
if (is_string($plugins)) {
if (! class_exists($plugins) || ! is_subclass_of($plugins, ContainerInterface::class)) {
throw new Exception\InvalidArgumentException(sprintf(
'Unable to locate padding plugin manager via class "%s"; '
. 'class does not exist or does not implement ContainerInterface',
$plugins
));
}
$plugins = new $plugins();
}
if (! $plugins instanceof ContainerInterface) {
throw new Exception\InvalidArgumentException(sprintf(
'Padding plugins must implements %s; received "%s"',
ContainerInterface::class,
is_object($plugins) ? get_class($plugins) : gettype($plugins)
));
}
static::$paddingPlugins = $plugins;
}
/**
* Get the key size for the selected cipher
*
* @return int
*/
public function getKeySize()
{
return $this->keySizes[$this->algo];
}
/**
* Set the encryption key
* If the key is longer than maximum supported, it will be truncated by getKey().
*
* @param string $key
* @return Openssl Provides a fluent interface
* @throws Exception\InvalidArgumentException
*/
public function setKey($key)
{
$keyLen = mb_strlen($key, '8bit');
if (! $keyLen) {
throw new Exception\InvalidArgumentException('The key cannot be empty');
}
if ($keyLen < $this->getKeySize()) {
throw new Exception\InvalidArgumentException(sprintf(
'The size of the key must be at least of %d bytes',
$this->getKeySize()
));
}
$this->key = $key;
return $this;
}
/**
* Get the encryption key
*
* @return string
*/
public function getKey()
{
if (empty($this->key)) {
return;
}
return mb_substr($this->key, 0, $this->getKeySize(), '8bit');
}
/**
* Set the encryption algorithm (cipher)
*
* @param string $algo
* @return Openssl Provides a fluent interface
* @throws Exception\InvalidArgumentException
*/
public function setAlgorithm($algo)
{
if (! in_array($algo, $this->getSupportedAlgorithms())) {
throw new Exception\InvalidArgumentException(sprintf(
'The algorithm %s is not supported by %s',
$algo,
self::class
));
}
$this->algo = $algo;
return $this;
}
/**
* Get the encryption algorithm
*
* @return string
*/
public function getAlgorithm()
{
return $this->algo;
}
/**
* Set the padding object
*
* @return Openssl Provides a fluent interface
*/
public function setPadding(Padding\PaddingInterface $padding)
{
$this->padding = $padding;
return $this;
}
/**
* Get the padding object
*
* @return Padding\PaddingInterface
*/
public function getPadding()
{
return $this->padding;
}
/**
* Set Additional Authentication Data
*
* @param string $aad
* @return self
* @throws Exception\InvalidArgumentException
* @throws Exception\RuntimeException
*/
public function setAad($aad)
{
if (! $this->isAuthEncAvailable()) {
throw new Exception\RuntimeException(
'You need PHP 7.1+ and OpenSSL with CCM or GCM mode to use AAD'
);
}
if (! $this->isCcmOrGcm()) {
throw new Exception\RuntimeException(
'You can set Additional Authentication Data (AAD) only for CCM or GCM mode'
);
}
if (! is_string($aad)) {
throw new Exception\InvalidArgumentException(sprintf(
'The provided $aad must be a string, %s given',
gettype($aad)
));
}
$this->aad = $aad;
return $this;
}
/**
* Get the Additional Authentication Data
*
* @return string
*/
public function getAad()
{
return $this->aad;
}
/**
* Get the authentication tag
*
* @return string
*/
public function getTag()
{
return $this->tag;
}
/**
* Set the tag size for CCM and GCM mode
*
* @param int $size
* @return self
* @throws Exception\InvalidArgumentException
* @throws Exception\RuntimeException
*/
public function setTagSize($size)
{
if (! is_int($size)) {
throw new Exception\InvalidArgumentException(sprintf(
'The provided $size must be an integer, %s given',
gettype($size)
));
}
if (! $this->isAuthEncAvailable()) {
throw new Exception\RuntimeException(
'You need PHP 7.1+ and OpenSSL with CCM or GCM mode to set the Tag Size'
);
}
if (! $this->isCcmOrGcm()) {
throw new Exception\RuntimeException(
'You can set the Tag Size only for CCM or GCM mode'
);
}
if ($this->getMode() === 'gcm' && ($size < 4 || $size > 16)) {
throw new Exception\InvalidArgumentException(
'The Tag Size must be between 4 to 16 for GCM mode'
);
}
$this->tagSize = $size;
return $this;
}
/**
* Get the tag size for CCM and GCM mode
*
* @return int
*/
public function getTagSize()
{
return $this->tagSize;
}
/**
* Encrypt
*
* @param string $data
* @throws Exception\InvalidArgumentException
* @return string
*/
public function encrypt($data)
{
// Cannot encrypt empty string
if (! is_string($data) || $data === '') {
throw new Exception\InvalidArgumentException('The data to encrypt cannot be empty');
}
if (null === $this->getKey()) {
throw new Exception\InvalidArgumentException('No key specified for the encryption');
}
if (null === $this->getSalt() && $this->getSaltSize() > 0) {
throw new Exception\InvalidArgumentException('The salt (IV) cannot be empty');
}
if (null === $this->getPadding()) {
throw new Exception\InvalidArgumentException('You must specify a padding method');
}
// padding
$data = $this->padding->pad($data, $this->getBlockSize());
$iv = $this->getSalt();
// encryption with GCM or CCM
if ($this->isCcmOrGcm()) {
$result = openssl_encrypt(
$data,
strtolower($this->encryptionAlgos[$this->algo] . '-' . $this->mode),
$this->getKey(),
OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING,
$iv,
$tag,
$this->getAad(),
$this->getTagSize()
);
$this->tag = $tag;
} else {
$result = openssl_encrypt(
$data,
strtolower($this->encryptionAlgos[$this->algo] . '-' . $this->mode),
$this->getKey(),
OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING,
$iv
);
}
if (false === $result) {
$errMsg = '';
while ($msg = openssl_error_string()) {
$errMsg .= $msg;
}
throw new Exception\RuntimeException(sprintf(
'OpenSSL error: %s',
$errMsg
));
}
if ($this->isCcmOrGcm()) {
return $tag . $iv . $result;
}
return $iv . $result;
}
/**
* Decrypt
*
* @param string $data
* @throws Exception\InvalidArgumentException
* @return string
*/
public function decrypt($data)
{
if (empty($data)) {
throw new Exception\InvalidArgumentException('The data to decrypt cannot be empty');
}
if (null === $this->getKey()) {
throw new Exception\InvalidArgumentException('No decryption key specified');
}
if (null === $this->getPadding()) {
throw new Exception\InvalidArgumentException('You must specify a padding method');
}
if ($this->isCcmOrGcm()) {
$tag = mb_substr($data, 0, $this->getTagSize(), '8bit');
$data = mb_substr($data, $this->getTagSize(), null, '8bit');
$this->tag = $tag;
}
$iv = mb_substr($data, 0, $this->getSaltSize(), '8bit');
$ciphertext = mb_substr($data, $this->getSaltSize(), null, '8bit');
$result = $this->attemptOpensslDecrypt($ciphertext, $iv, $this->tag);
if (false === $result) {
$errMsg = '';
while ($msg = openssl_error_string()) {
$errMsg .= $msg;
}
throw new Exception\RuntimeException(sprintf(
'OpenSSL error: %s',
$errMsg
));
}
// unpadding
return $this->padding->strip($result);
}
/**
* Get the salt (IV) size
*
* @return int
*/
public function getSaltSize()
{
return openssl_cipher_iv_length(
$this->encryptionAlgos[$this->algo] . '-' . $this->mode
);
}
/**
* Get the supported algorithms
*
* @return array
*/
public function getSupportedAlgorithms()
{
if (empty($this->supportedAlgos)) {
foreach ($this->encryptionAlgos as $name => $algo) {
// CBC mode is supported by all the algorithms
if (in_array($algo . '-cbc', $this->getOpensslAlgos())) {
$this->supportedAlgos[] = $name;
}
}
}
return $this->supportedAlgos;
}
/**
* Set the salt (IV)
*
* @param string $salt
* @return Openssl Provides a fluent interface
* @throws Exception\InvalidArgumentException
*/
public function setSalt($salt)
{
if ($this->getSaltSize() <= 0) {
throw new Exception\InvalidArgumentException(sprintf(
'You cannot use a salt (IV) for %s in %s mode',
$this->algo,
$this->mode
));
}
if (empty($salt)) {
throw new Exception\InvalidArgumentException('The salt (IV) cannot be empty');
}
if (mb_strlen($salt, '8bit') < $this->getSaltSize()) {
throw new Exception\InvalidArgumentException(sprintf(
'The size of the salt (IV) must be at least %d bytes',
$this->getSaltSize()
));
}
$this->iv = $salt;
return $this;
}
/**
* Get the salt (IV) according to the size requested by the algorithm
*
* @return string
*/
public function getSalt()
{
if (empty($this->iv)) {
return;
}
if (mb_strlen($this->iv, '8bit') < $this->getSaltSize()) {
throw new Exception\RuntimeException(sprintf(
'The size of the salt (IV) must be at least %d bytes',
$this->getSaltSize()
));
}
return mb_substr($this->iv, 0, $this->getSaltSize(), '8bit');
}
/**
* Get the original salt value
*
* @return string
*/
public function getOriginalSalt()
{
return $this->iv;
}
/**
* Set the cipher mode
*
* @param string $mode
* @return Openssl Provides a fluent interface
* @throws Exception\InvalidArgumentException
*/
public function setMode($mode)
{
if (empty($mode)) {
return $this;
}
if (! in_array($mode, $this->getSupportedModes())) {
throw new Exception\InvalidArgumentException(sprintf(
'The mode %s is not supported by %s',
$mode,
$this->algo
));
}
$this->mode = $mode;
return $this;
}
/**
* Get the cipher mode
*
* @return string
*/
public function getMode()
{
return $this->mode;
}
/**
* Return the OpenSSL supported encryption algorithms
*
* @return array
*/
protected function getOpensslAlgos()
{
if (empty($this->opensslAlgos)) {
$this->opensslAlgos = openssl_get_cipher_methods(true);
}
return $this->opensslAlgos;
}
/**
* Get all supported encryption modes for the selected algorithm
*
* @return array
*/
public function getSupportedModes()
{
$modes = [];
foreach ($this->encryptionModes as $mode) {
$algo = $this->encryptionAlgos[$this->algo] . '-' . $mode;
if (in_array($algo, $this->getOpensslAlgos())) {
$modes[] = $mode;
}
}
return $modes;
}
/**
* Get the block size
*
* @return int
*/
public function getBlockSize()
{
return $this->blockSizes[$this->algo];
}
/**
* Return true if authenticated encryption is available
*
* @return bool
*/
public function isAuthEncAvailable()
{
// Counter with CBC-MAC
$ccm = in_array('aes-256-ccm', $this->getOpensslAlgos());
// Galois/Counter Mode
$gcm = in_array('aes-256-gcm', $this->getOpensslAlgos());
return PHP_VERSION_ID >= 70100 && ($ccm || $gcm);
}
/**
* @return bool
*/
private function isCcmOrGcm()
{
return in_array(strtolower($this->mode), ['gcm', 'ccm'], true);
}
/**
* @param string $cipherText
* @param string $iv
* @param string $tag
* @return string|bool false on failure
*/
private function attemptOpensslDecrypt($cipherText, $iv, $tag)
{
if ($this->isCcmOrGcm()) {
return openssl_decrypt(
$cipherText,
strtolower($this->encryptionAlgos[$this->algo] . '-' . $this->mode),
$this->getKey(),
OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING,
$iv,
$tag,
$this->getAad()
);
}
return openssl_decrypt(
$cipherText,
strtolower($this->encryptionAlgos[$this->algo] . '-' . $this->mode),
$this->getKey(),
OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING,
$iv
);
}
}