### Convert PFX to PEM using OpenSSL

Source: https://github.com/antonsmuit/esia_connector_gost/blob/master/README.md

Use this command to convert a PFX file (containing private and public keys) to a PEM file. Ensure your OpenSSL installation supports Gost 2012, or use a Docker image with the necessary engine. The command assumes the PFX file is named 'backup_keys.pfx'.

```bash
openssl pkcs12 -in backup_keys.pfx -out backup_keys.pem -engine gost -nodes -clcerts
```

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