mirror of
https://github.com/cculianu/Fulcrum.git
synced 2026-08-18 13:09:12 +02:00
108 lines
2.7 KiB
C++
108 lines
2.7 KiB
C++
// Copyright (c) 2013-2016 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 "crypto/common.h"
|
|
#include "crypto/hmac_sha512.h"
|
|
#include "pubkey.h"
|
|
|
|
#ifdef __clang__
|
|
#pragma clang diagnostic push
|
|
#pragma clang diagnostic ignored "-Wold-style-cast"
|
|
#pragma clang diagnostic ignored "-Wsign-conversion"
|
|
#pragma clang diagnostic ignored "-Wshorten-64-to-32"
|
|
#pragma clang diagnostic ignored "-Wunused-parameter"
|
|
#endif
|
|
|
|
namespace bitcoin {
|
|
|
|
inline uint32_t ROTL32(uint32_t x, int8_t r) {
|
|
return (x << r) | (x >> (32 - r));
|
|
}
|
|
|
|
uint32_t MurmurHash3(uint32_t nHashSeed,
|
|
const std::vector<uint8_t> &vDataToHash) {
|
|
// The following is MurmurHash3 (x86_32), see
|
|
// http://code.google.com/p/smhasher/source/browse/trunk/MurmurHash3.cpp
|
|
uint32_t h1 = nHashSeed;
|
|
if (vDataToHash.size() > 0) {
|
|
const uint32_t c1 = 0xcc9e2d51;
|
|
const uint32_t c2 = 0x1b873593;
|
|
|
|
const int nblocks = vDataToHash.size() / 4;
|
|
|
|
//----------
|
|
// body
|
|
const uint8_t *blocks = &vDataToHash[0] + nblocks * 4;
|
|
|
|
for (int i = -nblocks; i; i++) {
|
|
uint32_t k1 = ReadLE32(blocks + i * 4);
|
|
|
|
k1 *= c1;
|
|
k1 = ROTL32(k1, 15);
|
|
k1 *= c2;
|
|
|
|
h1 ^= k1;
|
|
h1 = ROTL32(h1, 13);
|
|
h1 = h1 * 5 + 0xe6546b64;
|
|
}
|
|
|
|
//----------
|
|
// tail
|
|
const uint8_t *tail = (const uint8_t *)(&vDataToHash[0] + nblocks * 4);
|
|
|
|
uint32_t k1 = 0;
|
|
|
|
switch (vDataToHash.size() & 3) {
|
|
case 3:
|
|
k1 ^= tail[2] << 16;
|
|
[[fallthrough]];
|
|
// FALLTHROUGH
|
|
case 2:
|
|
k1 ^= tail[1] << 8;
|
|
[[fallthrough]];
|
|
// FALLTHROUGH
|
|
case 1:
|
|
k1 ^= tail[0];
|
|
k1 *= c1;
|
|
k1 = ROTL32(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, uint32_t nChild, uint8_t header,
|
|
const uint8_t data[32], uint8_t output[64]) {
|
|
uint8_t num[4];
|
|
num[0] = (nChild >> 24) & 0xFF;
|
|
num[1] = (nChild >> 16) & 0xFF;
|
|
num[2] = (nChild >> 8) & 0xFF;
|
|
num[3] = (nChild >> 0) & 0xFF;
|
|
CHMAC_SHA512(chainCode.begin(), chainCode.size())
|
|
.Write(&header, 1)
|
|
.Write(data, 32)
|
|
.Write(num, 4)
|
|
.Finalize(output);
|
|
}
|
|
|
|
|
|
} // end namespace bitcoin
|
|
|
|
#ifdef __clang__
|
|
#pragma clang diagnostic pop
|
|
#endif
|