mirror of https://github.com/bitcoin/bitcoin
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
93 lines
2.3 KiB
93 lines
2.3 KiB
// 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;
|
|
}
|