bootloader: Fix secure boot digest generation for image length where (len%128 < 32)

components/bootloader_support/include/esp_image_format.h

@@ -81,6 +81,8 @@ typedef struct {
 
 _Static_assert(sizeof(esp_image_header_t) == 24, "binary image header should be 24 bytes");
 
+#define ESP_IMAGE_HASH_LEN 32 /* Length of the appended SHA-256 digest */
+
 /* Header of binary image segment */
 typedef struct {
     uint32_t load_addr;
@@ -142,6 +144,16 @@ esp_err_t esp_image_load(esp_image_load_mode_t mode, const esp_partition_pos_t *
  */
 esp_err_t esp_image_verify_bootloader(uint32_t *length);
 
+/**
+ * @brief Verify the bootloader image.
+ *
+ * @param[out] Metadata for the image. Only valid if result is ESP_OK.
+ *
+ * @return As per esp_image_load_metadata().
+ */
+esp_err_t esp_image_verify_bootloader_data(esp_image_metadata_t *data);
+
+
 typedef struct {
     uint32_t drom_addr;
     uint32_t drom_load_addr;