[strongSwan] API to access keys used by IPsec

[T C]

Hello all,

I have an encryption protocol that currently use pre-shared keys.  I would
like to use charon from strongSwan to do the key exchange.  What's the API
to access those keys used by IPsec?  Also are those keys in memory or in
files?  If in files, where are they?

Thanks,
Terry
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