get_hash.cpp

checksum256 get_hash(const string &task, const account_name &contract)
{
  checksum256 result;
  size_t tasklen = strlen(task.c_str());
  char *buffer = (char *)malloc(tasklen + 8);
  memcpy(buffer, &contract, 8);
  memcpy(buffer + 8, task.data(), tasklen);
  sha256(buffer, tasklen + 8, &result);
  return result;
}