k5_get_etype_info
ret = k5_get_etype_info(context, icc, padata);
ret = k5_get_etype_info(context, icc, asrep->padata);
k5_get_etype_info(krb5_context context, krb5_init_creds_context ctx,
ret = k5_get_etype_info(context, ctx, in_padata);