[strongSwan] strongswan client 5.6.2 on linux unable to use ECDSA certs or keys

[Ettore Tagarelli]

this message is to rectify the log I posted before:
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Apr 21 17:14:52 cash charon-nm: 05[LIB] building CRED_PRIVATE_KEY - RSA
failed, tried 10 builders
Apr 21 17:14:52 cash NetworkManager[10447]: <info>  [1650554092.9642]
vpn-connection[0x55ce98c7e270,861b91a1-108a-46bd-8097-9033fa3013f0,"Connessione
VPN 1",0]: VPN connection: (ConnectInteractive) reply received
Apr 21 17:14:52 cash charon-nm: 05[CFG] received initiate for
NetworkManager connection Connessione VPN 1
Apr 21 17:14:52 cash charon-nm: 05[CFG] using CA certificate, gateway
identity 'xxxx.xxxx.xxxxxxx'
Apr 21 17:14:52 cash charon-nm: 05[LIB] OpenSSL X.509 parsing failed
Apr 21 17:14:52 cash charon-nm: 05[LIB] building CRED_CERTIFICATE - X509
failed, tried 6 builders
Apr 21 17:14:52 cash NetworkManager[10447]: <warn>  [1650554092.9656]
vpn-connection[0x55ce98c7e270,861b91a1-108a-46bd-8097-9033fa3013f0,"Connessione
VPN 1",0]: VPN connection: failed to connect: 'Loading peer certificate
failed.'
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this are the commands I used to create the CA key:
ipsec pki --gen --type ecdsa --size 256 --outform pem > ca.key

and the CA certificate:
ipsec pki --self --ca --lifetime 3650 --in ca.key --type ecdsa --dn "C=IT,
O=Xxxx CA, CN=xxxx.xxxx.xxxxxxx" --outform pem > ca.crt

similar commands for server and client key+cert.

Please help me!
Thanks
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