Method getHash

src/sha3.cpp:235–271

return latest hash as 16 hex characters

/// return latest hash as 16 hex characters
std::string SHA3::getHash()
{
  // process remaining bytes
  processBuffer();

  // convert hash to string
  static const char dec2hex[16 + 1] = "0123456789abcdef";

  // number of significant elements in hash (uint64_t)
  unsigned int hashLength = m_bits / 64;

  std::string result;
  result.reserve(m_bits / 4);
  for (unsigned int i = 0; i < hashLength; i++)
    for (unsigned int j = 0; j < 8; j++) // 64 bits => 8 bytes
    {
      // convert a byte to hex
      unsigned char oneByte = (unsigned char) (m_hash[i] >> (8 * j));
      result += dec2hex[oneByte >> 4];
      result += dec2hex[oneByte & 15];
    }

  // SHA3-224's last entry in m_hash provides only 32 bits instead of 64 bits
  unsigned int remainder = m_bits - hashLength * 64;
  unsigned int processed = 0;
  while (processed < remainder)
  {
    // convert a byte to hex
    unsigned char oneByte = (unsigned char) (m_hash[hashLength] >> processed);
    result += dec2hex[oneByte >> 4];
    result += dec2hex[oneByte & 15];

    processed += 8;
  }

  return result;
}


/// compute SHA3 of a memory block