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admit to the existence of nuance in HKDF #8987

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merged 2 commits into from May 30, 2023
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admit to the existence of nuance in HKDF #8987

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admit to the existence of nuance in HKDF
reaperhulk May 30, 2023
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Update docs/hazmat/primitives/key-derivation-functions.rst
reaperhulk May 30, 2023
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4 changes: 3 additions & 1 deletion docs/hazmat/primitives/key-derivation-functions.rst
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Expand Up @@ -460,7 +460,8 @@ HKDF
to be secret, but may cause stronger security guarantees if secret; see
:rfc:`5869` and the `HKDF paper`_ for more details. If ``None`` is
explicitly passed a default salt of ``algorithm.digest_size // 8`` null
bytes will be used.
bytes will be used. See `understanding HKDF`_ for additional detail about
the salt and info parameters.

:param bytes info: Application specific context information. If ``None``
is explicitly passed an empty byte string will be used.
Expand Down Expand Up @@ -1037,3 +1038,4 @@ Interface
.. _`here`: https://stackoverflow.com/a/30308723/1170681
.. _`recommends`: https://tools.ietf.org/html/rfc7914#section-2
.. _`The scrypt paper`: https://www.tarsnap.com/scrypt/scrypt.pdf
.. _`Understanding HKDF`: https://soatok.blog/2021/11/17/understanding-hkdf/
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