Randomized construction for local lookup-table hashers

1// Copyright (c) 2019-present The Bitcoin Core developers
2// Distributed under the MIT software license, see the accompanying
3// file COPYING or http://www.opensource.org/licenses/mit-license.php.
4
5#include <util/hasher.h>
6
7#include <crypto/siphash.h>
8#include <random.h>
9
10SaltedUint256Hasher::SaltedUint256Hasher() : m_hasher{
11    FastRandomContext().rand64(),
12    FastRandomContext().rand64()}
13{}
14
15SaltedTxidHasher::SaltedTxidHasher() : m_hasher{
16    FastRandomContext().rand64(),
17    FastRandomContext().rand64()}
18{}
19
20SaltedWtxidHasher::SaltedWtxidHasher() : m_hasher{
21    FastRandomContext().rand64(),
22    FastRandomContext().rand64()}
23{}
24
25SaltedOutpointHasher::SaltedOutpointHasher() : m_hasher{
26    FastRandomContext().rand64(),
27    FastRandomContext().rand64()}
28{}
29
30SaltedSipHasher::SaltedSipHasher() :
31    m_k0{FastRandomContext().rand64()},
32    m_k1{FastRandomContext().rand64()}
33{}
34
35size_t SaltedSipHasher::operator()(const std::span<const unsigned char>& script) const
36{
37    return CSipHasher(m_k0, m_k1).Write(script).Finalize();
38}
39