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// Copyright (c) 2013-2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <hash.h>
#include <span.h>
#include <crypto/common.h>
#include <crypto/hmac_sha512.h>
#include <bit>
#include <string>
unsigned int MurmurHash3(unsigned int nHashSeed, Span<const unsigned char> vDataToHash)
{
// The following is MurmurHash3 (x86_32), see https://github.com/aappleby/smhasher/blob/master/src/MurmurHash3.cpp
uint32_t h1 = nHashSeed;
const uint32_t c1 = 0xcc9e2d51;
const uint32_t c2 = 0x1b873593;
const int nblocks = vDataToHash.size() / 4;
//----------
// body
const uint8_t* blocks = vDataToHash.data();
for (int i = 0; i < nblocks; ++i) {
uint32_t k1 = ReadLE32(blocks + i*4);
k1 *= c1;
k1 = std::rotl(k1, 15);
k1 *= c2;
h1 ^= k1;
h1 = std::rotl(h1, 13);
h1 = h1 * 5 + 0xe6546b64;
}
//----------
// tail
const uint8_t* tail = vDataToHash.data() + nblocks * 4;
uint32_t k1 = 0;
switch (vDataToHash.size() & 3) {
case 3:
k1 ^= tail[2] << 16;
[[fallthrough]];
case 2:
k1 ^= tail[1] << 8;
[[fallthrough]];
case 1:
k1 ^= tail[0];
k1 *= c1;
k1 = std::rotl(k1, 15);
k1 *= c2;
h1 ^= k1;
}
//----------
// finalization
h1 ^= vDataToHash.size();
h1 ^= h1 >> 16;
h1 *= 0x85ebca6b;
h1 ^= h1 >> 13;
h1 *= 0xc2b2ae35;
h1 ^= h1 >> 16;
return h1;
}
void BIP32Hash(const ChainCode &chainCode, unsigned int nChild, unsigned char header, const unsigned char data[32], unsigned char output[64])
{
unsigned char num[4];
WriteBE32(num, nChild);
CHMAC_SHA512(chainCode.begin(), chainCode.size()).Write(&header, 1).Write(data, 32).Write(num, 4).Finalize(output);
}
uint256 SHA256Uint256(const uint256& input)
{
uint256 result;
CSHA256().Write(input.begin(), 32).Finalize(result.begin());
return result;
}
HashWriter TaggedHash(const std::string& tag)
{
HashWriter writer{};
uint256 taghash;
CSHA256().Write((const unsigned char*)tag.data(), tag.size()).Finalize(taghash.begin());
writer << taghash << taghash;
return writer;
}
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