Unify the hdr_cpy (we don't need two)

Author: dgarske

docs/Targets.md

@@ -3654,6 +3654,19 @@ make VORAGO_SDK_DIR=$PWD../VA416xx_SDK/
   34636       4   26976   61616    f0b0 wolfboot.elf
 ```
 
+Example of wolfBoot binary sizes based on algorithms:
+
+| Authentication | Hash | wolfBoot Size |
+|----------------|------|---------------|
+| ECC256 | SHA256 | 25,836 |
+| ECC384 | SHA384 | 34,652 |
+| ECC521 | SHA384 | 38,608 |
+| ED25519 | SHA256 | 31,448 |
+| RSA2048 | SHA256 | 19,148 |
+| RSA3072 | SHA384 | 28,828 |
+| RSA4096 | SHA3-384 | 19,216 |
+| ML-DSA 87 | SHA256 | 25,168 |
+
 ### Flashing Vorago VA416x0
 
 Flash using Segger JLink: `JLinkExe -CommanderScript tools/scripts/va416x0/flash_va416xx.jlink`

src/image.c

@@ -875,8 +875,14 @@ static uint8_t *get_sha_block(struct wolfBoot_image *img, uint32_t offset)
 }
 
 #ifdef EXT_FLASH
+#ifdef UNIT_TEST
 static uint8_t hdr_cpy[IMAGE_HEADER_SIZE] XALIGNED(4);
 static int hdr_cpy_done = 0;
+#else
+/* use from libwolfboot.c */
+extern uint8_t hdr_cpy[IMAGE_HEADER_SIZE] XALIGNED(4);
+extern int hdr_cpy_done;
+#endif
 
 /**
  * @brief Get a copy of the image header.

src/libwolfboot.c

@@ -904,8 +904,8 @@ uint16_t wolfBoot_find_header(uint8_t *haystack, uint16_t type, uint8_t **ptr)
 }
 
 #ifdef EXT_FLASH
-static uint8_t hdr_cpy[IMAGE_HEADER_SIZE] XALIGNED(4);
-static uint32_t hdr_cpy_done = 0;
+uint8_t hdr_cpy[IMAGE_HEADER_SIZE] XALIGNED(4);
+uint32_t hdr_cpy_done = 0;
 #endif
 
 /**
@@ -949,6 +949,10 @@ static inline uint16_t im2ns(uint16_t val)
 }
 
 #ifdef DELTA_UPDATES
+
+/* forward declaration */
+static uint8_t* wolfBoot_get_image_from_part(uint8_t part);
+
 /**
  * @brief Get delta update information.
  *