wanted to use blake2b bc X3DH described by OWS https://whispersystems.org/docs/specifications/x3dh/#cryptographic-notation … uses HKDF and a fixed salt/infoLabel
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Unless you explicitly need interoperability with something else, use crypto_kdf().
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they also recommend HKDF for DoubleRatchet https://whispersystems.org/docs/specifications/doubleratchet/#recommended-cryptographic-algorithms … with rootKey as salt, would you recommend I use crypto_kdf with no salt?
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HKDF is just a conservative choice. There's nothing wrong with it either.
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perfect! thank you so much for jumping in
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