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# Setting the Hash Algorithm to BLAKE3 | Nixtamal
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â¹âââ¹â± â¹ â¹ â¹â¹â¹ â¹â¹â¹ââ Home Install Manpage Changelog Roadmap Cookbook Real-world showcase Community FAQs Funding Setting the Hash Algorithm to BLAKE3 Nix supports a number of hash algorithms: MD5 (deprecated) SHA-1 (deprecated) SHA-256 (default) SHA-512 BLAKE3 (experimental) BLAKE3 support requires Nix version 2.31+ & enabling the blake3-hashes experimental feature .
This algorithm is very good with tree-like structuresâââlike the file system, which is what Nix is often hashing.
BLAKE3 offers faster hashing & is more secure which makes it a good choice for new setups that can afford to try it out.
At the time of writing, Nix flakes does not & cannot support changing the hash algorithm away from SHA-256 for input pinning requiring an input pinner like Nixtamal to automate it. How to use the BLAKE3 hash algorithm with Nix + Nixtamal Letâs show the way using the WhisperFish repositoryâs latest commit, but you can use any input kind. Using BLAKE3 on a single input // manifest.kdl inputs { whisperfish { archive { url "https://gitlab.com/whisperfish/whisperfish/-/archive/{{fresh-value}}/whisperfish-{{fresh-value}}.tar.bz2" } hash algorithm= BLAKE3 } fresh-cmd { $ git ls-remote --branches main "https://gitlab.com/whisperfish/whisperfish.git" | cut -f1 } } Additionally, you can set BLAKE3 to be the default in the manifest fileâs top level. Project-wide default // manifest.kdl version "1.0.0" default-hash-algorithm BLAKE3 Site made with Nix ( dep management), Nickel ( config ), Soupault ( SSG ), Docutils ( rST rendering), mandoc (manpage conversion), & sugilite256 (color scheme). © 2025â2026 toastal .
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