Lőrinc af50ba8500 test: add shared SipHash vectors ...

Lock SipHash-2-4 behavior into shared vectors before refactoring its round and finalization code.
Store inputs as ordered hex byte blocks so `CSipHasher` and the independent Python implementation hash the same byte sequence, with applicable `PresaltedSipHasher` overloads checked against the same vectors.
Add the 64 official SipHash-2-4 vectors alongside block-partition and empty-block cases for the generic path.
Move randomized generic/fixed comparisons to the integer fuzzer.

SipHash-1-3-UJ coverage can add expected outputs for compatible 8- and 32-byte block sequences.
The Python test reads a build-tree copy so functional-test staging behaves consistently when files are symlinked or copied.

Co-authored-by: Pieter Wuille <pieter@wuille.net>

2026-07-17 20:09:58 -07:00

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