[Openswan Users] Trying to get openswan and libreswan to interoperate

[jchludzinski]

1st, let me say up front: I'm a IPSec newbie.

I'm trying to get openswan and libreswan to interoperate because I'm 
dealing with a situation where on one side I'm using Raspbian and on the 
other side I'm using CentOS 7.4.

The Raspbian repo only contains openswan. I tried building libreswan 
from github but I had to retreat to an older version to get it to build. 
I built and installed an older version but it had "issues" running.

So on Raspbian I'm using openswan.

I tried using the secrets file generated with libreswan but it assumes 
all private info associated with a key is "stored in the NSS database".

When I try:

# ipsec newhostkey --output /etc/ipsec.secrets.new --configdir /tmp

I get: /usr/lib/ipsec/rsasigkey: unrecognized option '--configdir'

Why is this an "unrecognized option" ? According to "ipsec newhostkey 
--help", it's a perfectly valid option.

A broader question: Are there issues with getting openswan to store 
secret/private info in the key in an NSS database? ... to parallel the 
way it functions by default in libreswan.