Hi OpenSSL team. I did subscribe to openssl-users on December 2 or 3 but haven't got any response. Sending my question again to this address. I'm developing an engine using an hsm for key storage and the cryptographic operations when setting up a tls session with libssl. I have it working for RSA and EC keys by implementing ENGINE_set_load_pubkey_function(e, my_load_pub_key_function) ENGINE_set_load_privkey_function(e, my_load_priv_key_function) ENGINE_set_pkey_meths(e, my_pmeths_function) When my engine instantiates a EVP_PKEY the public part of RSA/EC_KEY is set with data from the hsm and gives it my RSA_METHOD/EC_KEY_METHOD. Then I use RSA_set_ex_data/EC_KEY_set_ex_data to store information about the hsm key to use. However ECX_KEY isn't public nor does it have any METHOD or ex data. My question is how to support ed25519/ed448 keys? /Bengt