Hashing data from a network stream at layer 7 without any metadata sent beforehand so you have to depend on EOF?
What would be an actual case where you need to use a XOF but don’t know the output length in advance?
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I was referring to the length of the digest, not the input.
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when you may need more bytes in the future from the same stream
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e.g. in HKDF: get 32 bytes of key material. Later you discover you need another key -> derive 64 bytes -> first 32 bytes are same
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