I just tried using an IKE daemon and EC certificates. I used the secp256k1 curve for key generation. The daemon claims
signature scheme ECDSA-256 not supported by private key
Now I am wondering if that is due to incompatibilities in the IKE daemon or cryptographic incompatibilities. In other words, is it generally impossible to use secp256k1 keys for ECDSA or is it only impossible with that specific IKE daemon?