kexc25519_keygen
void kexc25519_keygen(u_char key[CURVE25519_SIZE], u_char pub[CURVE25519_SIZE])
kexc25519_keygen(kex->c25519_client_key, cp);
kexc25519_keygen(server_key, server_pub);
kexc25519_keygen(server_key, server_pub);
kexc25519_keygen(kex->c25519_client_key, cp);
kexc25519_keygen(server_key, server_pub);
kexc25519_keygen(kex->c25519_client_key, cp);