asym_auth
prep->payload.data[asym_auth]);
void *auth = key->payload.data[asym_auth];
key->payload.data[asym_auth] = NULL;
prep->payload.data[asym_auth] = NULL;
sig = payload->data[asym_auth];
sig = payload->data[asym_auth];
prep->payload.data[asym_auth] = cert->sig;