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normalizeFilePath example

    public function __construct(string $certificate, string $privateKey, string $privateKeyPassphrase = null, string $extraCerts = null, int $signOptions = null)
    {
        if (!\extension_loaded('openssl')) {
            throw new \LogicException('PHP extension "openssl" is required to use SMime.');
        }

        $this->signCertificate = $this->normalizeFilePath($certificate);

        if (null !== $privateKeyPassphrase) {
            $this->signPrivateKey = [$this->normalizeFilePath($privateKey), $privateKeyPassphrase];
        } else {
            $this->signPrivateKey = $this->normalizeFilePath($privateKey);
        }

        $this->signOptions = $signOptions ?? \PKCS7_DETACHED;
        $this->extraCerts = $extraCerts ? realpath($extraCerts) : null;
    }

/** * @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(string|array $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();