Bitcoin ABC  0.28.12
P2P Digital Currency
hasher.cpp
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1 // Copyright (c) 2019 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 <random.h>
6 #include <util/hasher.h>
7 
8 #include <limits>
9 
11  : k0(GetRand<uint64_t>()), k1(GetRand<uint64_t>()) {}
12 
14  : k0(GetRand<uint64_t>()), k1(GetRand<uint64_t>()) {}
15 
17  : m_k0(GetRand<uint64_t>()), m_k1(GetRand<uint64_t>()) {}
18 
19 size_t SaltedSipHasher::operator()(const Span<const uint8_t> &script) const {
20  return CSipHasher(m_k0, m_k1)
21  .Write(script.data(), script.size())
22  .Finalize();
23 }
static const uint8_t k1[32]
SipHash-2-4.
Definition: siphash.h:13
uint64_t Finalize() const
Compute the 64-bit SipHash-2-4 of the data written so far.
Definition: siphash.cpp:82
CSipHasher & Write(uint64_t data)
Hash a 64-bit integer worth of data.
Definition: siphash.cpp:36
size_t operator()(const Span< const uint8_t > &script) const
Definition: hasher.cpp:19
const uint64_t m_k0
Salt.
Definition: hasher.h:107
const uint64_t m_k1
Definition: hasher.h:107
A Span is an object that can refer to a contiguous sequence of objects.
Definition: span.h:93
constexpr std::size_t size() const noexcept
Definition: span.h:209
constexpr C * data() const noexcept
Definition: span.h:198
T GetRand(T nMax=std::numeric_limits< T >::max()) noexcept
Generate a uniform random integer of type T in the range [0..nMax) nMax defaults to std::numeric_limi...
Definition: random.h:85