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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Mime\Crypto;
use Symfony\Component\Mime\Exception\RuntimeException;
use Symfony\Component\Mime\Message;
/**
* @author Sebastiaan Stok <s.stok@rollerscapes.net>
*/
final class SMimeEncrypter extends SMime
{
private $certs;
private $cipher;
/**
* @param string|string[] $certificate The path (or array of paths) of the file(s) containing the X.509 certificate(s)
* @param int|null $cipher A set of algorithms used to encrypt the message. Must be one of these PHP constants: https://www.php.net/manual/en/openssl.ciphers.php
*/
public function __construct($certificate, int $cipher = null)
{
if (!\extension_loaded('openssl')) {
throw new \LogicException('PHP extension "openssl" is required to use SMime.');
}
if (\is_array($certificate)) {
$this->certs = array_map([$this, 'normalizeFilePath'], $certificate);
} else {
$this->certs = $this->normalizeFilePath($certificate);
}
$this->cipher = $cipher ?? \OPENSSL_CIPHER_AES_256_CBC;
}
public function encrypt(Message $message): Message
{
$bufferFile = tmpfile();
$outputFile = tmpfile();
$this->iteratorToFile($message->toIterable(), $bufferFile);
if (!@openssl_pkcs7_encrypt(stream_get_meta_data($bufferFile)['uri'], stream_get_meta_data($outputFile)['uri'], $this->certs, [], 0, $this->cipher)) {
throw new RuntimeException(sprintf('Failed to encrypt S/Mime message. Error: "%s".', openssl_error_string()));
}
$mimePart = $this->convertMessageToSMimePart($outputFile, 'application', 'pkcs7-mime');
$mimePart->getHeaders()
->addTextHeader('Content-Transfer-Encoding', 'base64')
->addParameterizedHeader('Content-Disposition', 'attachment', ['name' => 'smime.p7m'])
;
return new Message($message->getHeaders(), $mimePart);
}
}
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