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hashes: truncate -> reduce, mention SHA-256

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the longer SHA-256 hashes are not truncated, but in fact processed.

Co-authored-by: Thomas <twatson52@mac.com>
This commit is contained in:
Valentin Gagarin
2022-08-04 12:37:48 +02:00
co-authored by Thomas
parent 9cabba1fc3
commit 29c062537d
1 changed files with 2 additions and 1 deletions
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doc/manual/src/architecture/store/path.md
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@@ -62,12 +62,13 @@ Store objects are therefore said to be either [input-addressed](#input-addressin
::: {.note}
**Historical note**: The 20 byte restriction is because originally digests were [SHA-1][sha-1] hashes.
This is no longer true, but longer hashes and other information are still truncated to 20 bytes for compatibility.
Nix now uses [SHA-256][sha-256], and longer hashes are still reduced to 20 bytes for compatibility.
:::
[digest]: https://en.m.wiktionary.org/wiki/digest#Noun
[hash]: https://en.m.wikipedia.org/wiki/Cryptographic_hash_function
[sha-1]: https://en.m.wikipedia.org/wiki/SHA-1
[sha-256]: https://en.m.wikipedia.org/wiki/SHA-256
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