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// Copyright (c) 2013-2015 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"
inline uint32_t ROTL32(uint32_t x, int8_t r)
{
return (x << r) | (x >> (32 - r));
}
unsigned int MurmurHash3(unsigned int nHashSeed, const std::vector<unsigned char>& 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;
case 2:
k1 ^= tail[1] << 8;
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, unsigned int nChild, unsigned char header, const unsigned char data[32], unsigned char output[64])
{
unsigned char 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);
}
#define ROTL(x, b) (uint64_t)(((x) << (b)) | ((x) >> (64 - (b))))
#define SIPROUND do { \
v0 += v1; v1 = ROTL(v1, 13); v1 ^= v0; \
v0 = ROTL(v0, 32); \
v2 += v3; v3 = ROTL(v3, 16); v3 ^= v2; \
v0 += v3; v3 = ROTL(v3, 21); v3 ^= v0; \
v2 += v1; v1 = ROTL(v1, 17); v1 ^= v2; \
v2 = ROTL(v2, 32); \
} while (0)
CSipHasher::CSipHasher(uint64_t k0, uint64_t k1)
{
v[0] = 0x736f6d6570736575ULL ^ k0;
v[1] = 0x646f72616e646f6dULL ^ k1;
v[2] = 0x6c7967656e657261ULL ^ k0;
v[3] = 0x7465646279746573ULL ^ k1;
count = 0;
}
CSipHasher& CSipHasher::Write(uint64_t data)
{
uint64_t v0 = v[0], v1 = v[1], v2 = v[2], v3 = v[3];
v3 ^= data;
SIPROUND;
SIPROUND;
v0 ^= data;
v[0] = v0;
v[1] = v1;
v[2] = v2;
v[3] = v3;
count++;
return *this;
}
uint64_t CSipHasher::Finalize() const
{
uint64_t v0 = v[0], v1 = v[1], v2 = v[2], v3 = v[3];
v3 ^= ((uint64_t)count) << 59;
SIPROUND;
SIPROUND;
v0 ^= ((uint64_t)count) << 59;
v2 ^= 0xFF;
SIPROUND;
SIPROUND;
SIPROUND;
SIPROUND;
return v0 ^ v1 ^ v2 ^ v3;
}
uint64_t SipHashUint256(uint64_t k0, uint64_t k1, const uint256& val)
{
/* Specialized implementation for efficiency */
uint64_t d = val.GetUint64(0);
uint64_t v0 = 0x736f6d6570736575ULL ^ k0;
uint64_t v1 = 0x646f72616e646f6dULL ^ k1;
uint64_t v2 = 0x6c7967656e657261ULL ^ k0;
uint64_t v3 = 0x7465646279746573ULL ^ k1 ^ d;
SIPROUND;
SIPROUND;
v0 ^= d;
d = val.GetUint64(1);
v3 ^= d;
SIPROUND;
SIPROUND;
v0 ^= d;
d = val.GetUint64(2);
v3 ^= d;
SIPROUND;
SIPROUND;
v0 ^= d;
d = val.GetUint64(3);
v3 ^= d;
SIPROUND;
SIPROUND;
v0 ^= d;
v3 ^= ((uint64_t)4) << 59;
SIPROUND;
SIPROUND;
v0 ^= ((uint64_t)4) << 59;
v2 ^= 0xFF;
SIPROUND;
SIPROUND;
SIPROUND;
SIPROUND;
return v0 ^ v1 ^ v2 ^ v3;
}
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