Re-calculate the bootloader's SHA256

esp-rs · Jan 31, 2024 · a4a1da6 · a4a1da6
1 parent 31817fa
commit a4a1da6
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/espflash/src/image_format/idf_bootloader.rs b/espflash/src/image_format/idf_bootloader.rs
@@ -73,6 +73,13 @@ impl<'a> IdfBootloaderFormat<'a> {
             bytes_of(&header).iter().copied(),
         );
 
+        // re-calculate hash of the bootloader - needed since we modified the header
+        let bootloader_len = bootloader.len();
+        let mut hasher = Sha256::new();
+        hasher.update(&bootloader[..bootloader_len - 32]);
+        let hash = hasher.finalize();
+        bootloader.to_mut()[bootloader_len - 32..].copy_from_slice(&hash);
+
         // write the header of the app
         // use the same settings as the bootloader
         // just update the entry point