openssl_cms_encrypt

It took me a while to find out the correct way how to sign and encrypt data with these functions.
I needed that to communicate with German Health Insurance Providers as part of a DiGA. Maybe someone finds that useful.
<?php
function signAndEncrypt(string $rawData): string
{
 $tempDir = __DIR__ . '/tmp';
 $tempfileOriginal = tempnam($tempDir, 'original');
 $tempfileSigned = tempnam($tempDir, 'signed');
 $tempfileEncrypted = tempnam($tempDir, 'signedEncrypted');
 file_put_contents($tempfileOriginal, $rawData);
 // pick the correct certificate for the recipient
 $recipientsCertificateFile = __DIR__ . '/recipientsCertificate.pem';
 // -----BEGIN CERTIFICATE----- ...-----END CERTIFICATE-----
 $recipientsCertificate = file_get_contents($recipientsCertificateFile);
 // Certificate:
 // Data:
 // Version: 3 (0x2)...
 $myCertificate = file_get_contents(__DIR__ . '/my.crt');
 $myPrivateKey = openssl_pkey_get_private(
 // -----BEGIN RSA PRIVATE KEY----- ... -----END RSA PRIVATE KEY-----
 file_get_contents(__DIR__ . '/my.prv.key.pem')
 );
 openssl_cms_sign(
 input_filename: $tempfileOriginal,
 output_filename: $tempfileSigned,
 certificate: $myCertificate,
 private_key: $myPrivateKey,
 headers: [],
 encoding: OPENSSL_ENCODING_DER,
 );
 openssl_cms_encrypt(
 input_filename: $tempfileSigned,
 output_filename: $tempfileEncrypted,
 certificate: $recipientsCertificate,
 headers: [],
 flags: OPENSSL_CMS_BINARY | OPENSSL_CMS_NOSIGS | OPENSSL_CMS_NOVERIFY,
 encoding: OPENSSL_ENCODING_DER,
 cipher_algo: OPENSSL_CIPHER_AES_256_CBC
 );
 return file_get_contents($tempfileEncrypted);
}