31d7bcc583
- At the AGM we formed an ad-hoc documentation working group. - One of our ideas was that we should have a last reviewed date for documentation, so that we can periodically implement a review mechanism (GitHub Actions posts to Slack for a regular documentation outdatedness check?) to track how old docs are and ensure they're still relevant. - This is a first step towards that goal, by adding a `last_review_date` to the metadata of all docs with a date of earlier than Homebrew's inception because everything needs reviewing so that we start from a good base!
23 lines
934 B
Markdown
23 lines
934 B
Markdown
---
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last_review_date: "1970-01-01"
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---
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# MD5 and SHA-1 Deprecation
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In early 2015 Homebrew started the process of deprecating _SHA1_ for package
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integrity verification. Since then formulae under the Homebrew organisation
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have been migrated to use _SHA-256_ for verification; this includes both source
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packages and our precompiled packages (bottles).
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Homebrew has since stopped supporting _SHA1_ and _MD5_ entirely.
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_MD5_ checksums were removed from core formulae in 2012 and as of April 2015
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installing a formula verified by _MD5_ is actively blocked.
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We removed _SHA1_ support in **November 2016**,
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21 months after we started warning people to move away from it for verification.
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This is enforced in the same way _MD5_ is, by blocking the installation of that
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individual formula until the checksum is migrated.
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This means custom taps, local custom formulae, etc. need to be migrated to use
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_SHA-256_ before you can install them.
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