const struct ssh_signkey *ec_alg_by_oid(int len, const void *oid,
const struct ec_curve **curve);
const unsigned char *ec_alg_oid(const struct ssh_signkey *alg, int *oidlen);
const struct ssh_signkey *ec_alg_by_oid(int len, const void *oid,
const struct ec_curve **curve);
const unsigned char *ec_alg_oid(const struct ssh_signkey *alg, int *oidlen);