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Add Checksums to Firmware & External App images (#1809)

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* Pad image to 1MB and add simple checksum

* Test code to verify firmware checksum

* Comment out unneeded zlib

* Add files via upload

* Print space remaining in ROM

* Append checksum to external apps too

* Check external app checksums when loading

* Is it 2024 already?!

* Validate firmware checksum before flashing

* Add files via upload

* Added flash error warning to nav screen

* Clang

* Replaced some hard-coded values with #defines

* Check FW checksum before USB serial flash too

* Add files via upload
This commit is contained in:
Mark Thompson 2024-01-24 16:37:21 -06:00 • committed by GitHub
parent 2d98c5d311
commit 6a6c6d6502
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13 changed files with 179 additions and 13 deletions
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16
firmware/tools/export_external_apps.py
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@ -104,6 +104,14 @@ for external_image_prefix in sys.argv[4:]:
external_application_image = patch_image(external_application_image, search_address, replace_address)
external_application_image[memory_location_header_position:memory_location_header_position+4] = replace_address.to_bytes(4, byteorder='little')
checksum = 0
for i in range(0, len(external_application_image), 4):
checksum += external_application_image[i] + (external_application_image[i + 1] << 8) + (external_application_image[i + 2] << 16) + (external_application_image[i + 3] << 24)
final_checksum = 0
checksum = (final_checksum - checksum) & 0xFFFFFFFF
external_application_image += checksum.to_bytes(4, 'little')
write_image(external_application_image, "{}/{}.ppma".format(binary_dir, external_image_prefix))
continue
@ -127,5 +135,13 @@ for external_image_prefix in sys.argv[4:]:
print("application {} can not exceed 32kb: {} bytes used".format(external_image_prefix, len(external_application_image)))
sys.exit(-1)
checksum = 0
for i in range(0, len(external_application_image), 4):
checksum += external_application_image[i] + (external_application_image[i + 1] << 8) + (external_application_image[i + 2] << 16) + (external_application_image[i + 3] << 24)
final_checksum = 0
checksum = (final_checksum - checksum) & 0xFFFFFFFF
external_application_image += checksum.to_bytes(4, 'little')
# write .ppma (portapack mayhem application)
write_image(external_application_image, "{}/{}.ppma".format(binary_dir, external_image_prefix))