git / moonbite-core / src/hash.cpp · raw

// Copyright (c) 2013-2018 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 <string>inline uint32_t ROTL32(uint32_t x, int8_t r){    return (x << r) | (x >> (32 - r));}unsigned int MurmurHash3(unsigned int nHashSeed, Span<const 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;    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;        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);}uint256 SHA256Uint256(const uint256& input){    uint256 result;    CSHA256().Write(input.begin(), 32).Finalize(result.begin());    return result;}CHashWriter TaggedHash(const std::string& tag){    CHashWriter writer(SER_GETHASH, 0);    uint256 taghash;    CSHA256().Write((const unsigned char*)tag.data(), tag.size()).Finalize(taghash.begin());    writer << taghash << taghash;    return writer;}