mkimage: Add support for signing with pkcs11
Add support for signing with the pkcs11 engine. This allows FIT images
to be signed with keys securely stored on a smartcard, hardware security
module, etc without exposing the keys.
Support for other engines can be added in the future by modifying
rsa_engine_get_pub_key() and rsa_engine_get_priv_key() to construct
correct key_id strings.
Signed-off-by: George McCollister <george.mccollister@gmail.com>
diff --git a/tools/image-host.c b/tools/image-host.c
index c1a0122..5e4d690 100644
--- a/tools/image-host.c
+++ b/tools/image-host.c
@@ -149,7 +149,7 @@
static int fit_image_setup_sig(struct image_sign_info *info,
const char *keydir, void *fit, const char *image_name,
- int noffset, const char *require_keys)
+ int noffset, const char *require_keys, const char *engine_id)
{
const char *node_name;
char *algo_name;
@@ -170,6 +170,7 @@
info->checksum = image_get_checksum_algo(algo_name);
info->crypto = image_get_crypto_algo(algo_name);
info->require_keys = require_keys;
+ info->engine_id = engine_id;
if (!info->checksum || !info->crypto) {
printf("Unsupported signature algorithm (%s) for '%s' signature node in '%s' image node\n",
algo_name, node_name, image_name);
@@ -194,12 +195,13 @@
* @size: size of data in bytes
* @comment: Comment to add to signature nodes
* @require_keys: Mark all keys as 'required'
+ * @engine_id: Engine to use for signing
* @return 0 if ok, -1 on error
*/
static int fit_image_process_sig(const char *keydir, void *keydest,
void *fit, const char *image_name,
int noffset, const void *data, size_t size,
- const char *comment, int require_keys)
+ const char *comment, int require_keys, const char *engine_id)
{
struct image_sign_info info;
struct image_region region;
@@ -209,7 +211,7 @@
int ret;
if (fit_image_setup_sig(&info, keydir, fit, image_name, noffset,
- require_keys ? "image" : NULL))
+ require_keys ? "image" : NULL, engine_id))
return -1;
node_name = fit_get_name(fit, noffset, NULL);
@@ -288,11 +290,12 @@
* @image_noffset: Requested component image node
* @comment: Comment to add to signature nodes
* @require_keys: Mark all keys as 'required'
+ * @engine_id: Engine to use for signing
* @return: 0 on success, <0 on failure
*/
int fit_image_add_verification_data(const char *keydir, void *keydest,
void *fit, int image_noffset, const char *comment,
- int require_keys)
+ int require_keys, const char *engine_id)
{
const char *image_name;
const void *data;
@@ -329,7 +332,7 @@
strlen(FIT_SIG_NODENAME))) {
ret = fit_image_process_sig(keydir, keydest,
fit, image_name, noffset, data, size,
- comment, require_keys);
+ comment, require_keys, engine_id);
}
if (ret)
return ret;
@@ -569,7 +572,8 @@
static int fit_config_process_sig(const char *keydir, void *keydest,
void *fit, const char *conf_name, int conf_noffset,
- int noffset, const char *comment, int require_keys)
+ int noffset, const char *comment, int require_keys,
+ const char *engine_id)
{
struct image_sign_info info;
const char *node_name;
@@ -587,7 +591,7 @@
return -1;
if (fit_image_setup_sig(&info, keydir, fit, conf_name, noffset,
- require_keys ? "conf" : NULL))
+ require_keys ? "conf" : NULL, engine_id))
return -1;
ret = info.crypto->sign(&info, region, region_count, &value,
@@ -635,7 +639,7 @@
static int fit_config_add_verification_data(const char *keydir, void *keydest,
void *fit, int conf_noffset, const char *comment,
- int require_keys)
+ int require_keys, const char *engine_id)
{
const char *conf_name;
int noffset;
@@ -654,7 +658,7 @@
strlen(FIT_SIG_NODENAME))) {
ret = fit_config_process_sig(keydir, keydest,
fit, conf_name, conf_noffset, noffset, comment,
- require_keys);
+ require_keys, engine_id);
}
if (ret)
return ret;
@@ -664,7 +668,8 @@
}
int fit_add_verification_data(const char *keydir, void *keydest, void *fit,
- const char *comment, int require_keys)
+ const char *comment, int require_keys,
+ const char *engine_id)
{
int images_noffset, confs_noffset;
int noffset;
@@ -687,7 +692,7 @@
* i.e. component image node.
*/
ret = fit_image_add_verification_data(keydir, keydest,
- fit, noffset, comment, require_keys);
+ fit, noffset, comment, require_keys, engine_id);
if (ret)
return ret;
}
@@ -710,7 +715,8 @@
noffset = fdt_next_subnode(fit, noffset)) {
ret = fit_config_add_verification_data(keydir, keydest,
fit, noffset, comment,
- require_keys);
+ require_keys,
+ engine_id);
if (ret)
return ret;
}