Support eXtendable Output Functions (XOFs) - #142
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An eXtendable Output Function (XOF) transforms an arbitrary length input message into an indefinite stream of output bits.
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Botan's FFI exposes first class XOFs since version 3.11.0. This PR introduces raw and low-level bindings to the XOF class interface, which are mostly identical to the bindings of hashes, except that XOFs are able to generate an indefinite output stream. Supported algorithms are both SHAKE128 and SHAKE256 variants as well as Ascon-XOF128. Stateful tests have been added to both XOF and hash bindings. As in all other modules I have put @jorisdral and @ldillinger as maintainer of the new XOF modules.