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test: add SipHash-1-3-UJ coverage

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Add SipHash-1-3-UJ outputs to the shared vectors for sequences of 8- and 32-byte blocks.
Check generic writes and applicable fixed-width `Hash` overloads against those outputs, and fuzz their equivalence including mixed normal/jumbo encodings.

The outputs were generated by an independent implementation that Claude Opus 4.8 produced using only the `SipHasher13UJ` class comment as its prompt.

Co-authored-by: Lőrinc <pap.lorinc@gmail.com>
This commit is contained in:
Pieter Wuille
2026-07-15 17:11:28 -07:00
committed by Lőrinc
parent a0ccd4ad17
commit 3aea85411f
3 changed files with 131 additions and 64 deletions
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32
src/test/fuzz/integer.cpp
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@@ -129,6 +129,38 @@ FUZZ_TARGET(integer, .init = initialize_integer)
hasher.Write(extra);
assert(presalted_hasher(u256, u32) == hasher.Finalize());
}
{
const uint64_t data0{u160.GetUint64(0)}, data1{u160.GetUint64(1)};
SipHasher13UJ hasher{u64, u64_2};
const SipHasher13UJ fixed_hasher{u64, u64_2};
hasher.WriteJumbo(u256);
assert(fixed_hasher.Hash(u256) == hasher.Finalize());
hasher.Write(data0);
assert(fixed_hasher.Hash(u256, data0) == hasher.Finalize());
SipHasher13UJ reference{u64, u64_2};
SipHasher13UJ mixed{u64, u64_2};
reference.WriteJumbo(u256);
mixed.WriteJumbo(u256);
const auto write_normal{[](SipHasher13UJ& hasher, uint64_t data, bool as_jumbo) {
if (as_jumbo) {
uint256 data256{};
WriteLE64(data256.data(), data);
hasher.WriteJumbo(data256);
} else {
hasher.Write(data);
}
}};
reference.Write(data0).Write(data1);
write_normal(mixed, data0, b);
write_normal(mixed, data1, u8 & 1);
assert(mixed.Finalize() == reference.Finalize());
reference.WriteJumbo(u256).Write(data0);
assert(mixed.Hash(u256, data0) == reference.Finalize());
}
(void)ToLower(ch);
(void)ToUpper(ch);
{