🗿 StoneChecksums - Generate SHA-256 and SHA-512 checksums of a RubyGem

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OTOH, if ci_badges.map(&:color).all? { it == "green"} 👇️ send money so I can do more of this. FLOSS is now my full-time job.

Generate SHA-256 and SHA-512 checksums of a rubygem library, and commit them to your repository. The SHA-256 will match the shown for each gem published to RubyGems.org.

# as a rake task:
bundle exec rake build:generate_checksums
# as a binstub:
bin/generate_checksums

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Works with JRuby
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Works with MRI Ruby 3
Works with MRI Ruby 2
Works with MRI Ruby 1
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Install the gem and add to the application's Gemfile by executing:

$ bundle add stone_checksums

If bundler is not being used to manage dependencies, install the gem by executing:

$ gem install stone_checksums

This gem is cryptographically signed, and has verifiable SHA-256 and SHA-512 checksums by stone_checksums. Be sure the gem you install hasn’t been tampered with by following the instructions below.

Add my public key (if you haven’t already, expires 2045-04-29) as a trusted certificate:

gem cert --add <(curl -Ls https://raw.github.com/galtzo-floss/certs/main/pboling.pem)

You only need to do that once. Then proceed to install with:

gem install stone_checksums -P HighSecurity

The HighSecurity trust profile will verify signed gems, and not allow the installation of unsigned dependencies.

If you want to up your security game full-time:

bundle config set --global trust-policy MediumSecurity

MediumSecurity instead of HighSecurity is necessary if not all the gems you use are signed.

NOTE: Be prepared to track down certs for signed gems and add them the same way you added mine.

Configuration env vars:

• GEM_CHECKSUMS_CHECKSUMS_DIR: Where to write checksum files (default: checksums)
• GEM_CHECKSUMS_PACKAGE_DIR: Where to look for built gems (default: pkg)
• GEM_CHECKSUMS_GIT_DRY_RUN: When true, run a dry-run commit and clean up temporary files
• GEM_CHECKSUMS_ASSUME_YES: When true and Bundler < 2.7.0, proceed without interactive prompt (still requires SOURCE_DATE_EPOCH)

This library helps you generate checksums for your built gem and commit them.

• Bundler >= 2.7.0: No SOURCE_DATE_EPOCH needed. Bundler now uses a constant timestamp internally, making builds reproducible by default.
• Bundler < 2.7.0: You must set SOURCE_DATE_EPOCH before building the gem to get deterministic checksums, or upgrade Bundler.
  • If you still want to proceed on old Bundler non-interactively, set GEM_CHECKSUMS_ASSUME_YES=true (SOURCE_DATE_EPOCH is still required).

Usage via Rake (recommended):

bundle exec rake build
bundle exec rake build:generate_checksums

Usage via CLI (equivalent):

bin/gem_checksums [pkg/your_gem-1.2.3.gem]

• Module StoneChecksums (primary namespace)
  • ::install_tasks() -> void — loads Rake tasks (delegates to GemChecksums.install_tasks)
  • ::generate(git_dry_run: Boolean = false) -> void — generate SHA-256/512 checksums and commit (delegates to GemChecksums.generate)
  • Error < GemChecksums::Error — error class hierarchy is preserved
  • Version::VERSION: String — current gem version
• Module GemChecksums (deprecated, backward-compatible namespace)
  • ::install_tasks() -> void — identical behavior
  • ::generate(git_dry_run: Boolean = false) -> void — identical behavior
  • Error — base error class used internally
  • Version::VERSION: String — same as StoneChecksums::Version::VERSION

See the generated YARD docs for full details: Current release on RubyDoc.info.

While galtzo-floss tools are free software and will always be, the project would benefit immensely from some funding. Raising a monthly budget of... "dollars" would make the project more sustainable.

We welcome both individual and corporate sponsors! We also offer a wide array of funding channels to account for your preferences (although currently Open Collective is our preferred funding platform).

If you're working in a company that's making significant use of galtzo-floss tools we'd appreciate it if you suggest to your company to become a galtzo-floss sponsor.

You can support the development of galtzo-floss tools via GitHub Sponsors, Liberapay, PayPal, Open Collective and Tidelift.

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Support us with a monthly donation and help us continue our activities. [Become a backer]

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Become a sponsor and get your logo on our README on GitHub with a link to your site. [Become a sponsor]

How wonderful it is that nobody need wait a single moment before starting to improve the world.
—Anne Frank

I’m driven by a passion to foster a thriving open-source community – a space where people can tackle complex problems, no matter how small. Revitalizing libraries that have fallen into disrepair, and building new libraries focused on solving real-world challenges, are my passions — totaling 79 hours of FLOSS coding over just the past seven days, a pretty regular week for me. I was recently affected by layoffs, and the tech jobs market is unwelcoming. I’m reaching out here because your support would significantly aid my efforts to provide for my family, and my farm (11 🐔 chickens, 2 🐶 dogs, 3 🐰 rabbits, 8 🐈‍ cats).

If you work at a company that uses my work, please encourage them to support me as a corporate sponsor. My work on gems you use might show up in bundle fund.

I’m developing a new library, floss_funding, designed to empower open-source developers like myself to get paid for the work we do, in a sustainable way. Please give it a look.

Floss-Funding.dev: 👉️ No network calls. 👉️ No tracking. 👉️ No oversight. 👉️ Minimal crypto hashing. 💡 Easily disabled nags

See SECURITY.md.

If you need some ideas of where to help, you could work on adding more code coverage, or if it is already 💯 (see below) check reek, issues, or PRs, or use the gem and think about how it could be better.

We so if you make changes, remember to update it.

See CONTRIBUTING.md for more detailed instructions.

See CONTRIBUTING.md.

Everyone interacting with this project's codebases, issue trackers, chat rooms and mailing lists agrees to follow the .

Made with contributors-img.

Also see GitLab Contributors: https://gitlab.com/galtzo-floss/stone_checksums/-/graphs/main

This Library adheres to . Violations of this scheme should be reported as bugs. Specifically, if a minor or patch version is released that breaks backward compatibility, a new version should be immediately released that restores compatibility. Breaking changes to the public API will only be introduced with new major versions.

dropping support for a platform is both obviously and objectively a breaking change
—Jordan Harband (@ljharb, maintainer of SemVer) in SemVer issue 716

I understand that policy doesn't work universally ("exceptions to every rule!"), but it is the policy here. As such, in many cases it is good to specify a dependency on this library using the Pessimistic Version Constraint with two digits of precision.

For example:

spec.add_dependency("stone_checksums", "~> 1.0")

SemVer should, IMO, but doesn't explicitly, say that dropping support for specific Platforms is a breaking change to an API. It is obvious to many, but not all, and since the spec is silent, the bike shedding is endless.

To get a better understanding of how SemVer is intended to work over a project's lifetime, read this article from the creator of SemVer:

• "Major Version Numbers are Not Sacred"

See CHANGELOG.md for a list of releases.

The gem is available as open source under the terms of the MIT License . See LICENSE.txt for the official Copyright Notice.

• Copyright (c) 2023, 2025 Peter H. Boling, of Galtzo.com , and stone_checksums contributors.

Maintainers have teeth, and need to pay their dentists. After getting laid off in an RIF in March, and filled with many dozens of rejections, I'm now spending ~80 hours a week building open source tools. I'm hoping to be able to pay for my kids' health insurance this month, so if you value the work I am doing, I need your support. Please consider sponsoring me or the project.

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To say "thanks for maintaining such a great tool" 👇️ Join the Discord or ☝️ send money.

To join the community or get help 👇️ Join the Discord.

Thanks for RTFM. ☺️