ssl_password_file

Specifies a file with passphrases for secret keys where each passphrase is specified on a separate line. Passphrases are tried in turn when loading the key.

Example:

stream {
    ssl_password_file /etc/keys/global.pass;
    ...

    server {
        listen 127.0.0.1:12345;
        ssl_certificate_key /etc/keys/first.key;
    }

    server {
        listen 127.0.0.1:12346;

        # named pipe can also be used instead of a file
        ssl_password_file /etc/keys/fifo;
        ssl_certificate_key /etc/keys/second.key;
    }
}