使用C / C ++中的PFX证书对字符串进行签名

Question

I need to convert a PHP code to C/C++, this code makes the signature of a message using a PFX certificate, I did a long search on google, to check how I could do this, but I did not find something that explained how to do this.

My actual PHP code is:

    file_put_contents('file_msg', $mensagem);
    $certificado_pfx = file_get_contents('certificado.pfx');
    if (!openssl_pkcs12_read($certificado_pfx, $result, 'pass')) {
        throw new Exception('Não foi possível ler o certificado .pfx');
    }

    $certificado_key = openssl_x509_read($result['cert']);
    $private_key = openssl_pkey_get_private($result['pkey'], 'pass');

    openssl_pkcs7_sign('file_msg', 'signature', $certificado_key, $private_key, [], PKCS7_BINARY | PKCS7_TEXT);

So, how I can do the same, in C/C++ ?