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KangarooTwelve is a family of two fast and secure extendable-output functions (XOFs): KT128 and KT256. These functions generalize traditional hash functions by allowing arbitrary output lengths. KangarooTwelve was designed by SHA-3 authors. It aims to deliver higher performance than the SHA-3 and SHAKE functions defined in FIPS 202, while preserving their flexibility and core security principles. On high-end platforms, it can take advantage of parallelism, whether through multiple CPU cores or SIMD instructions. As modern SHA-3 constructions, KT128 and KT256 can serve as general-purpose hash functions and can be used, for example, in key-derivation, and with arbitrarily large inputs. RFC9861: https://datatracker.ietf.org/doc/rfc9861/