Howto openssl

Install openssl

I used git-scm from here https://git-scm.com/download/win Alternative install openssl direcly or use mingw.

Create certificate sign request (.crs file)

1. Generate a key used for signing:

openssl genrsa -out client-debal-YOURNAMEHERE.key 4096

generates the key in the current folder

Output:

Generating RSA private key, 2048 bit long modulus (2 primes)
.............................+++++
....................................................................+++++
e is 65537 (0x010001)

The generated file looks like this:

-----BEGIN RSA PRIVATE KEY-----
MIIEowIBAAKCAQEA6s8ObYmliHRZke6S3SIeSExhc1oaWluXFoKx6THWugOh0lTE
tYm/HFHFGE?EFJKOKPOv/WvvLzroO2Y//V442J+6VWNcA/SM0uiXzDC76rC/DpWi
...

Note never show or give this file to anyone else!

2. Create sign request:

openssl req -sha512 -out client-debal-YOURNAMEHERE.csr -key client-debal-YOURNAMEHERE.key -new

Output:

You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [AU]:de
State or Province Name (full name) [Some-State]:
Locality Name (eg, city) []:
Organization Name (eg, company) [Internet Widgits Pty Ltd]:debal
Organizational Unit Name (eg, section) []:debal
Common Name (e.g. server FQDN or YOUR name) []:debal-YOURNAMEHERE
Email Address []:

Please enter the following 'extra' attributes
to be sent with your certificate request
A challenge password []:
An optional company name []:

The generated file looks like this:

-----BEGIN CERTIFICATE REQUEST-----
MIICrTCCAZUCAQAwaDELMAkGA1UEBhMCZGUxCzAJBgNVBAgMAmJ3MRIwEAYDVQQH
DAlzdHV0dGdhcnQxDjAMBgNVBAoMBWRlYmFsMQ4wDAYDVQQLDAVkZWJhbDEYMBYG

3. Send the csr to sign
4. Wait until signed
5. You get the following files:

• debal-YOURNAMEHERE.crt -> Your signed csr
• nexit-openvpn.crt -> the server certificate authority
• ta.key -> tls-auth key, used for encryption
• .openvpn file -> general connection information (missing)

6. Configure the VPN-Profile

misc

openssl.exe version OpenSSL 1.1.1h 22 Sep 2020