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To me it seems like HMAC(salt, IKM) would be weaker against a brute force search of IKMs, as the digest of the salt can in this case be precalculated by an attacker (assuming the salt is a non-secret value or zero). Yes, it is slightly faster to brute force, but if the IKM does not have enough entropy to give brute force resistance, then a small factor ...

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