dfu hash not matching calculated hash from a .bin file

[ziv123]

hello nordic

i am working with nrf52840, device with zephyr and i am writing an application that uses the smp service to preform dfu over BLE.

i am struggling with calculating or finding the hash in from the .bin file generated with west build 

i found a hash implementation in rust (its the application lang i am using) which match this site test : 

https://emn178.github.io/online-tools/sha256_checksum.html

also looked at the sha256.c file in the ncs/modules/crypto/mbedtls/library/ and it looks the same 

however, both of them don't give the same hash as i see in the smp dfu notification images 

what is the protocol or what am i doing wrong ?

hope to read from you soon

best regards

Ziv

[Simon]

Try running imgtool verify <binary file>.

 For example:

imgtool verify app_update.bin
Image was correctly validated
Image version: 0.0.0+0
Image digest: 1e28160956d8a6d507e6279730c6b7302191248eaae2aab338e426c91e9869ac

The value after "Image digest" is the hash (sha256) of the image header + body.

You can check out the python functions main.py-->verify() --> image.py-->verify() to see the calculations.

Best regards,

Simon