aes: Allow to store randomly generated IV in the FIT

When the initialisation vector is randomly generated, its value shall be
stored in the FIT together with the encrypted data. The changes allow to
store the IV in the FIT also in the case where the key is not stored in
the DTB but retrieved somewhere else at runtime.

Signed-off-by: Paul HENRYS <paul.henrys_ext@softathome.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

tools/image-host.c

@@ -540,7 +540,7 @@ fit_image_process_cipher(const char *keydir, void *keydest, void *fit,
 	 * size values
 	 * And, if needed, write the iv in the FIT file
 	 */
-	if (keydest) {
+	if (keydest || (!keydest && !info.ivname)) {
 		ret = info.cipher->add_cipher_data(&info, keydest, fit, node_noffset);
 		if (ret) {
 			fprintf(stderr,