Where can I get certificates for authorization through ESIA?

Question

OpenSSL

Good afternoon,
you need to do authorization on the site through esia using OAuth2.0. I found a ready-made solution
on github , downloaded it, uploaded it to the root of the site. As I wrote in the documentation, the following:

$config = [
   'clientId' => 'INSP03211',
   'redirectUrl' => 'http://my-site.com/response.php',
   'portalUrl' => 'https://esia-portal1.test.gosuslugi.ru/',
   'privateKeyPath' => 'my-site.com.pem',
   'privateKeyPassword' => 'my-site.com',
   'certPath' => 'my-site.com.pem',
   'tmpPath' => 'tmp',
];
$esia = new \esia\OpenId($config);
echo $esia->getUrl();

The example has the following lines:

'privateKeyPath' => 'my-site.com.pem',
   'privateKeyPassword' => 'my-site.com',
   'certPath' => 'my-site.com.pem',

Where can I get it? Can I create this on my computer? What programs do I need for this?
If it's not difficult, then please be more specific.
Thank you very much in advance!

Answer 1

If ESIA accepts any certificates - generate them. Tons of waste paper have been written about how to generate a self-signed certificate. If it accepts only state ones - get it from the state, of course.
UPD Just because the topic of certificates cannot be overcome, google more

Answer 2

I think that you need to contact the public services directly. Most likely, the issue of issuing a certificate to you is
paid. It is highly unlikely that a portal will accept self-signed certificates. I think that esia should know the "client".