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// 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/hmac_sha512.h>
inline uint32_t ROTL32(uint32_t x, int8_t r) {
return (x << r) | (x >> (32 - r));
}
uint32_t MurmurHash3(uint32_t nHashSeed, Span<const 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;
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 = ROTL32(k1, 15);
k1 *= c2;
h1 ^= k1;
h1 = ROTL32(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 = 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);
}

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