text: // Copyright (c) 2019-2023 The MOCHA developers
  // Copyright (c) 2013-2014 The Bitcoin developers
  // Copyright (c) 2017-2019 The PIVX 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"
  #include "crypto/scrypt.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 uint32_t* blocks = (const uint32_t*)(&vDataToHash[0] + nblocks * 4);
  
          for (int i = -nblocks; i; i++) {
              uint32_t k1 = blocks[i];
  
              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);
  }
  
  void scrypt_hash(const char* pass, unsigned int pLen, const char* salt, unsigned int sLen, char* output, unsigned int N, unsigned int r, unsigned int p, unsigned int dkLen)
  {
      scrypt(pass, pLen, salt, sLen, output, N, r, p, dkLen);
  }
  