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How to check a release download against the signed checksums with Opensidian

Confirm the AppImage or package matches the maintainer's signed SHA256SUMS before running it.

Who it is forA security-minded Linux user or packager who wants to confirm a download was not altered.

The problemDownloaded binaries can be tampered with, and they need a check before they run on the system.

The outcomeThe download is confirmed against the signed SHA256SUMS file, and the signature is checked against the published key.

What you need first

  • A Linux x86_64 machine (the README lists Linux x86_64 only)
  • For the DEB path: a Debian or Ubuntu system with sudo access
  • For the source build: build tools, WebKitGTK 4.1 development packages, and Rust 1.98.0

Steps

  1. Download the file you want, plus SHA256SUMS and SHA256SUMS.asc from the v0.6.2 release page, using curl -LO https://github.com/jpzk/opensidian/releases/download/v0.6.2/SHA256SUMS
  2. Import the maintainer key with gpg --keyserver hkps://keys.openpgp.org --recv-keys A6E69ED6BC4779F3281721484CC1AFDE15B64EA3
  3. Check the signature with gpg --verify SHA256SUMS.asc SHA256SUMS
  4. Check the file hashes with sha256sum -c --ignore-missing SHA256SUMS
  5. Install or run the file only if every checked line reports OK.

Prompt for your agent

In the jpzk/opensidian repo, download SHA256SUMS and SHA256SUMS.asc for v0.6.2 into <download-folder>, import the key listed in the README, and run gpg verify and sha256sum -c. Report the gpg verification result and each OK line. Verify that the gpg output shows a good signature from the expected key fingerprint before reporting success.

Caveat. The check only proves the file matches what the maintainer published, so it depends on the key being the real maintainer key from the README.

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