1<?php 2 3/* 4 * This file is part of the Symfony package. 5 * 6 * (c) Fabien Potencier <fabien@symfony.com> 7 * 8 * For the full copyright and license information, please view the LICENSE 9 * file that was distributed with this source code. 10 */ 11 12namespace Symfony\Component\Mime\Crypto; 13 14use Symfony\Component\Mime\Exception\RuntimeException; 15use Symfony\Component\Mime\Message; 16 17/** 18 * @author Sebastiaan Stok <s.stok@rollerscapes.net> 19 */ 20final class SMimeEncrypter extends SMime 21{ 22 private $certs; 23 private $cipher; 24 25 /** 26 * @param string|string[] $certificate The path (or array of paths) of the file(s) containing the X.509 certificate(s) 27 * @param int|null $cipher A set of algorithms used to encrypt the message. Must be one of these PHP constants: https://www.php.net/manual/en/openssl.ciphers.php 28 */ 29 public function __construct($certificate, int $cipher = null) 30 { 31 if (!\extension_loaded('openssl')) { 32 throw new \LogicException('PHP extension "openssl" is required to use SMime.'); 33 } 34 35 if (\is_array($certificate)) { 36 $this->certs = array_map([$this, 'normalizeFilePath'], $certificate); 37 } else { 38 $this->certs = $this->normalizeFilePath($certificate); 39 } 40 41 $this->cipher = $cipher ?? OPENSSL_CIPHER_AES_256_CBC; 42 } 43 44 public function encrypt(Message $message): Message 45 { 46 $bufferFile = tmpfile(); 47 $outputFile = tmpfile(); 48 49 $this->iteratorToFile($message->toIterable(), $bufferFile); 50 51 if (!@openssl_pkcs7_encrypt(stream_get_meta_data($bufferFile)['uri'], stream_get_meta_data($outputFile)['uri'], $this->certs, [], 0, $this->cipher)) { 52 throw new RuntimeException(sprintf('Failed to encrypt S/Mime message. Error: "%s".', openssl_error_string())); 53 } 54 55 $mimePart = $this->convertMessageToSMimePart($outputFile, 'application', 'pkcs7-mime'); 56 $mimePart->getHeaders() 57 ->addTextHeader('Content-Transfer-Encoding', 'base64') 58 ->addParameterizedHeader('Content-Disposition', 'attachment', ['name' => 'smime.p7m']) 59 ; 60 61 return new Message($message->getHeaders(), $mimePart); 62 } 63} 64