Every time I download Raspbian (last time Raspbian Stretch with desktop) I try to verify SHA256. However, every time the result is different from the one on the website, although I am quite sure the download was successful and without manipulation.

Why is that? Am I calculating in a wrong way?

The last time I generated the sha256 on OSX with the command shasum -a 256 2018-06-27-raspbian-stretch.img

  • 4
    side note - "I am quite sure the download was successful and without manipulation." - no you aren't. Sep 18, 2018 at 0:20
  • 3
    If you're getting the hash from the same channel as the file it claims to verify, it's actually only a checksum (detecting accidental corruption). An attacker that could replace the image could also modify the hash to match. Sep 18, 2018 at 2:10
  • 1
    @immibis No you are right I am not in one particular occasion, but if everytime the sha256 does not correspond is more likely something is not right in how I am calculating it rather than me being attacked on every download I do in different situations with different networks and different everything....At least I think so otherwise I would have to think I am under attack every time but I am not that paranoid Sep 18, 2018 at 8:35

1 Answer 1


The SHA-256 checksum on the downloads page is for the ZIP file, not the IMG file.

  • It confused me because it seems OSX extract directly the zip file so I did not get it was downloaded as zip. Sep 17, 2018 at 16:19
  • You'll find the .zip file is there in the parent folder of the location the contents were extracted to. This took me a while to get used to, too. :)
    – Jules
    Sep 17, 2018 at 16:30
  • 12
    Sidenote: Provided checksums are in general directly for the downloaded file, not for any files inside a downloaded archive/container. Sep 17, 2018 at 17:56

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.