gpg,agent: Support Ed448 signing.
* agent/pksign.c (do_encode_eddsa): First argument is NBITs, so that it can support Ed448, as well as Ed25519. (agent_pksign_do): Follow the change. * agent/sexp-secret.c (fixup_when_ecc_private_key): No fix-up needed for Ed448, it's only for classic curves. * common/openpgp-oid.c (oidtable): Add Ed448. * common/sexputil.c (get_pk_algo_from_key): Ed448 is only for EdDSA. * g10/export.c (match_curve_skey_pk): Ed448 is for EdDSA. * g10/keygen.c (gen_ecc): Support Ed448 with the name of "ed448". (ask_algo, parse_key_parameter_part): Handle "ed448". * g10/pkglue.c (pk_verify): Support Ed448. (pk_check_secret_key): Support Ed448. * g10/sign.c (hash_for): Defaults to SHA512 for Ed448. (make_keysig_packet): Likewise.
- Signed-off-by: NIIBE Yutaka <email@example.com>