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https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-185.pdf This adds useful standard SHA3-based constructions from the NIST SP 800-185 document: - cSHAKE: similar to the SHAKE extensible hash function, but with the addition of a context parameter. - KMAC: SHAKE-based authentication / keyed XOF - TupleHash: unambiguous hashing of tuples These are required by recent protocols and specifications. They also offer properties that none of the currently available constructions in the stdlib offer, especially the ability to safely hash tuples. Other keyed hash functions/XOFs will fall back to using HMAC, which is suboptimal from a performance perspective, but fine from a security perspective.