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<?php
namespace Mautic\CoreBundle\Helper;
use Mautic\CoreBundle\Security\Cryptography\Cipher\Symmetric\SymmetricCipherInterface;
use Mautic\CoreBundle\Security\Exception\Cryptography\Symmetric\InvalidDecryptionException;
class EncryptionHelper
{
/**
* @var SymmetricCipherInterface[]
*/
private ?array $availableCiphers = null;
/**
* @var string
*/
private $key;
public function __construct(
CoreParametersHelper $coreParametersHelper
) {
$nonCipherArgs = 1;
for ($i = $nonCipherArgs; $i < func_num_args(); ++$i) {
$possibleCipher = func_get_arg($i);
if (!($possibleCipher instanceof SymmetricCipherInterface)) {
throw new \InvalidArgumentException($possibleCipher::class.' has to implement '.SymmetricCipherInterface::class);
}
if (!$possibleCipher->isSupported()) {
continue;
}
$this->availableCiphers[] = $possibleCipher;
}
if (!$this->availableCiphers || 0 === count($this->availableCiphers)) {
throw new \RuntimeException('None of possible cryptography libraries is supported');
}
$this->key = $coreParametersHelper->get('mautic.secret_key');
}
/**
* Returns a 64 character string.
*/
public static function generateKey(): string
{
return hash('sha256', uniqid(mt_rand(), true));
}
/**
* Encrypt string.
*
* @param mixed $data
*/
public function encrypt($data): string
{
$encryptionCipher = reset($this->availableCiphers);
$initVector = $encryptionCipher->getRandomInitVector();
$encrypted = $encryptionCipher->encrypt(serialize($data), $this->key, $initVector);
return base64_encode($encrypted).'|'.base64_encode($initVector);
}
/**
* Decrypt string.
* Returns false in case of failed decryption.
*
* @param string $data
* @param bool $mainDecryptOnly
*
* @return mixed|false
*/
public function decrypt($data, $mainDecryptOnly = false)
{
$encryptData = explode('|', $data);
$encryptedMessage = base64_decode($encryptData[0]);
$initVector = base64_decode($encryptData[1]);
$mainTried = false;
foreach ($this->availableCiphers as $availableCipher) {
if ($mainDecryptOnly && $mainTried) {
return false;
}
try {
return Serializer::decode($availableCipher->decrypt($encryptedMessage, $this->key, $initVector));
} catch (InvalidDecryptionException) {
}
$mainTried = true;
}
return false;
}
}
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