SHA512 hash - Linux App image wrong value

[AltCoiFish]

-$ cat latest-linux.yml

version: 0.81.1
files:

• url: Polkadot-JS-Apps-0.81.1.AppImage
  sha512: oIMoSoy2SVTtHQLmuk9XXFHII50W/iahh8ShxqcKpJX/O3wk3Dc8uLRTzds3zo0ELEisse86VgN56PUPydJpaQ==
  size: 89387265
  blockMapSize: 94485
  path: Polkadot-JS-Apps-0.81.1.AppImage
  sha512: oIMoSoy2SVTtHQLmuk9XXFHII50W/iahh8ShxqcKpJX/O3wk3Dc8uLRTzds3zo0ELEisse86VgN56PUPydJpaQ==
  releaseDate: '2021-02-22T10:00:15.479Z

based on the lastest version https://github.com/polkadot-js/apps/releases/tag/v0.81.1 is:

_$ sha512sum Polkadot-JS-Apps-0.81.1.AppImage
a083284a8cb64954ed1d02e6ba4f575c51c8239d16fe26a187c4a1c6a70aa495ff3b7c24dc373cb8b453cddb37ce8d042c48acb1ef3a560379e8f50fc9d26969 Polkadot-JS-Apps-0.81.1.AppImage

[jacogr]

The sha512 is base64 encoded. When I put this in the JS console of the apps UI -

// output
console.log(
  // convert bytes to hex
  util.u8aToHex(
   // decode base64
    hashing.base64Decode(
      'oIMoSoy2SVTtHQLmuk9XXFHII50W/iahh8ShxqcKpJX/O3wk3Dc8uLRTzds3zo0ELEisse86VgN56PUPydJpaQ=='
    ),
    // don't add the 0x in-front
    -1, false
  )
)

the output is -

a083284a8cb64954ed1d02e6ba4f575c51c8239d16fe26a187c4a1c6a70aa495ff3b7c24dc373cb8b453cddb37ce8d042c48acb1ef3a560379e8f50fc9d26969

Don't ask me why the sha512 is base64 encoded there. The packager itself does that.

[AltCoiFish]

The sha512 is base64 encoded. When I put this in the JS console of the apps UI -

Sounds reasonable, not sure if everyone did know the hash was base64 encoded, as I was used to get plain sha2256 or sha512 hashes on open-source software.

Could we add the base64 information in : latest-linux.yml ?

[AltCoiFish]

closing it, as this might be helpful for new user checking the hash values before downloading it.

[jacogr]

That is all part of the Electron packager and it uses that information to manage the auto-updates. So we cannot mess with the format there at all. As much as I also find it weird.

So there should be a one-liner that does sha -> bytes -> base64 that can be clearly documented for checks. Something along these lines -

$ sha512sum Polkadot-JS-Apps-0.81.1.AppImage | xxd -r -p | base64

[polkadot-js-bot]

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