Удобно же хранить вместо трёх файлов один, вот и я искал как объединить ключи с файлом конфигурации. В общем всё очень просто. Вместо строк
ca ca.crt
cert user1.crt
key user1.key

вставляем следующую конструкцию...

<ca>
# содержимое сертификата ca.crt
</ca>
<cert>
# содержимое user1.crt
</cert>
<key>
# содержимое user1.key
</key>

Ну и пример:
client
dev tap
proto tcp

remote 78.22.144.34 1194

resolv-retry infinite
nobind
persist-key
persist-tun
comp-lzo
ns-cert-type server

<ca>
-----BEGIN CERTIFICATE----- MIIB1jCCAT+gAwIBAgIEAmLSTjANBgkqhkiG9w0BAQUFADAVMRMwEQYDVQQDEwpP cGVuVlBOIENBMB4XDTEzMDExNzAyMTExMloXDTIzMDEyMjAyMTExMlowKDEmMCQG A1UEAxQdZnJyaWN0aW9uQGdtYWlsLmNvbV9BVVRPTE9HSU4wgZ8wDQYJKoZIhvcN AQEBBQADgY0AMIGJAoGBALVEXIZYYu1Inmejuo4Si6Eo5AguTX5sg1pGbLkJSTR4 BXQsy6ocUnZ9py8htYkipkUUhjY7zDu+wJlUtWnVCwCYtewYfEc/+azH7+7eU6ue T2K2IKdik1KWhdtNbaNphVvSlgdyKiuZDTCedptgWyiL50N7FMcUUMjjXYh/hftB AgMBAAGjIDAeMAkGA1UdEwQCMAAwEQYJYIZIAYb4QgEBBAQDAgeAMA0GCSqGSIb3 DQEBBQUAA4GBABhVzSYXHlQEPNaKGmx9hMwwnNKcHgD9cCmC9lX/KR2Y+vT/QGxK 7sYlJInb/xmpa5TUQYc1nzDs9JBps1mCtZbYNNDpYnKINAKSDsM+KOQaSYQ2FhHk bmBZk/K96P7VntzYI5S02+hOWnvjq5Wk4gOt1+L18+R/XujuxGbwnHW2 -----END CERTIFICATE-----
</ca>
<cert>
-----BEGIN CERTIFICATE----- MIIB1jCCAT+gAwIBAgIEAmLSTjANBgkqhkiG9w0BAQUFADAVMRMwEQYDVQQDEwpP cGVuVlBOIENBMB4XDTEzMDExNzAyMTExMloXDTIzMDEyMjAyMTExMlowKDEmMCQG A1UEAxQdZnJyaWN0aW9uQGdtYWlsLmNvbV9BVVRPTE9HSU4wgZ8wDQYJKoZIhvcN AQEBBQADgY0AMIGJAoGBALVEXIZYYu1Inmejuo4Si6Eo5AguTX5sg1pGbLkJSTR4 BXQsy6ocUnZ9py8htYkipkUUhjY7zDu+wJlUtWnVCwCYtewYfEc/+azH7+7eU6ue T2K2IKdik1KWhdtNbaNphVvSlgdyKiuZDTCedptgWyiL50N7FMcUUMjjXYh/hftB AgMBAAGjIDAeMAkGA1UdEwQCMAAwEQYJYIZIAYb4QgEBBAQDAgeAMA0GCSqGSIb3 DQEBBQUAA4GBABhVzSYXHlQEPNaKGmx9hMwwnNKcHgD9cCmC9lX/KR2Y+vT/QGxK 7sYlJInb/xmpa5TUQYc1nzDs9JBps1mCtZbYNNDpYnKINAKSDsM+KOQaSYQ2FhHk bmBZk/K96P7VntzYI5S02+hOWnvjq5Wk4gOt1+L18+R/XujuxGbwnHW2 -----END CERTIFICATE-----
</cert>
<key>
-----BEGIN PRIVATE KEY----- MIICdgIBADANBgkqhkiG9w0BAQEFAASCAmAwggJcAgEAAoGBALVEXIZYYu1Inmej uo4Si6Eo5AguTX5sg1pGbLkJSTR4BXQsy6ocUnZ9py8htYkipkUUhjY7zDu+wJlU tWnVCwCYtewYfEc/+azH7+7eU6ueT2K2IKdik1KWhdtNbaNphVvSlgdyKiuZDTCe dptgWyiL50N7FMcUUMjjXYh/hftBAgMBAAECgYEAsNjgOEYVRhEaUlzfzmpzhakC SKT8AALYaAPbYO+ZVzJdh8mIbg+xuF7A9G+7z+5ZL35lrpXKnONuvmlxkK5ESwvV Q7EOQYCZCqa8xf3li3GUBLwcwXKtOUr3AYXhdbOh2viQdisD4Ky7H6/Nd3yMc3bu R4pErmWeHei+l6dIwAECQQDqljNxi9babmHiei6lHaznCMg5+jfAyDXgHvO/afFr 1bDQVDTDK+64kax4E9pvDZC6B/HGse9hOUGWXTjb0WZBAkEAxdAw/14iJIUcE5sz HDy2R0RmbUQYFjrNgBCi5tnmr1Ay1zHAs1VEF+Rg5IOtCBO50I9jm4WCSwCtN6zF FoFVAQJAUGfBJDcZIm9ZL6ZPXJrqS5oP/wdLmtFE3hfd1gr7C8oHu7BREWB6h1qu 8c1kPlI4+/qDHWaZtQpJ977mIToJwQJAMcgUHKAm/YPWLgT31tpckRDgqgzh9u4z e1A0ft5FlMcdFFT8BuWlblHWJIwSxp6YO6lqSuBNiuyPqxw6uVAxAQJAWGxOgn2I fGkWLLw4WMpkFHmwDVTQVwhTpmMP8rWGYEdYX+k9HeOJyVMrJKg2ZPXOPtybrw8T PUZE7FgzVNxypQ== -----END PRIVATE KEY-----
</key>


Материал честно стырен