gh-122854: Add Py_HashBuffer() function

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• Issue: [C API] Add Py_HashBuffer() function #122854

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📚 Documentation preview 📚: https://cpython-previews--122855.org.readthedocs.build/

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cc @pitrou @encukou

[erlend-aasland]

Did you intend to update Misc/stable_abi.toml also?

[encukou]

Thank you! This looks good, but, wasn't the name supposed to be Py_HashBuffer?

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Thank you! This looks good, but, wasn't the name capi-workgroup/decisions#13 (comment)?

Oh, you're right! I modified the PR to use Py_HashBuffer(). I also rebased the PR to fix a merge conflict.

[encukou]

With Erlend's suggestions, this should be good to merge!

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With Erlend's suggestions, this should be good to merge!

Fixed. Oh, I thought that I already addressed his review, but it was maybe on another similar PR.

I also replaced hash_bytes() with hash_buffer() in tests. Nicely spotted @encukou.

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@erlend-aasland:

Did you intend to update Misc/stable_abi.toml also?

capi-workgroup/decisions#13 doesn't mention the stable ABI. Do you think that this API should be added to the stable ABI?

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@erlend-aasland: I enabled auto-merge. If you consider that the function should be added to the limited C API 3.14, I can prepare a follow-up PR.

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Merged, thanks for reviews.