https://devzone.nordicsemi.com/f/nordic-q-a/83146/dfu-hash-not-matching-calculated-hash-from-a-bin-filehello 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 en-USTelligent Community 13Thu, 30 Dec 2021 16:25:41 GMThttps://devzone.nordicsemi.com/thread/345506?ContentTypeID=1Thu, 30 Dec 2021 16:25:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:786c7edf-24fd-48f6-9bb8-d14728c9d8a1Simon<p>Try running&nbsp;<code>imgtool verify &lt;binary file&gt;</code>.</p> <p>&nbsp;For example:</p> <p><pre class="ui-code" data-mode="text">imgtool verify app_update.bin Image was correctly validated Image version: 0.0.0+0 Image digest: 1e28160956d8a6d507e6279730c6b7302191248eaae2aab338e426c91e9869ac</pre></p> <p>The value after &quot;Image digest&quot; is the&nbsp;hash (sha256) of the image header + body.</p> <p>You can check out the python functions&nbsp;<a href="https://github.com/nrfconnect/sdk-mcuboot/blob/v1.7.99-ncs4/scripts/imgtool/main.py#L145">main.py--&gt;verify()</a>&nbsp;--&gt;&nbsp;<a href="https://github.com/nrfconnect/sdk-mcuboot/blob/v1.7.99-ncs4/scripts/imgtool/image.py#L574-L577">image.py--&gt;verify()</a> to see the calculations.</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>