KRB5_AUTH_CONTEXT_USE_SUBKEY
krb5_auth_con_addflags(context, ac, KRB5_AUTH_CONTEXT_USE_SUBKEY, NULL);
KRB5_AUTH_CONTEXT_USE_SUBKEY,
if (auth_context->flags & KRB5_AUTH_CONTEXT_USE_SUBKEY) {
acflags |= KRB5_AUTH_CONTEXT_USE_SUBKEY;
else if (auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_USE_SUBKEY) {