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It seems that the authors of Keccak sponge (the algorithm chosen to be SHA-3) do think their SHAKE functions can directly be used for simplifying OAEP and PSS: The introduction of extendable-output functions (or XOFs, pronounced zoff) is a particularly nice feature of the standard. A XOF like SHAKE128 or SHAKE256 can be seen as a generalization of hash ...

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