How to write an md5-hash decryptor with rainbow table in C++. Write me an accessible explanation step-by-step.
An MD5 hash is a cryptographic hash function that takes an input (or message) and returns a 128-bit fixed-size output, which is a hash of the input. A rainbow table is a precomputed table used to reverse hash functions. Here's a step-by-step explanation of how you can write a program in C++ to perform a brute-force attack on an MD5 hash using a rainbow table:

Include the necessary libraries: To perform hash functions in C++, you need to include the crypto library.
#include <iostream>
#include <string>
#include <crypto++/md5.h>
#include <fstream>

Define a function to generate the MD5 hash of an input string: You can use the MD5 library from Crypto++ to generate the hash of an input string.
std::string generateMD5(const std::string& input) {
  CryptoPP::MD5 hash;
  byte digest[CryptoPP::MD5::DIGESTSIZE];
  hash.CalculateDigest(digest, (const byte*)input.c_str(), input.length());

  std::string output;
  CryptoPP::HexEncoder encoder;
  encoder.Attach(new CryptoPP::StringSink(output));
  encoder.Put(digest, sizeof(digest));
  encoder.MessageEnd();

  return output;
}

Load the rainbow table into memory: You can read the rainbow table from a file and store it in a data structure, such as a hash table. The key of the hash table will be the hash value and the value will be the original input that generated the hash.
std::unordered_map<std::string, std::string> loadRainbowTable(const std::string& fileName) {
  std::unordered_map<std::string, std::string> rainbowTable;
  std::ifstream file(fileName);
  std::string line;
  while (std::getline(file, line)) {
    size_t separator = line.find(:);
    std::string hash = line.substr(0, separator);
    std::string original = line.substr(separator + 1);
    rainbowTable[hash] = original;
  }
  return rainbowTable;
}

Decrypt the hash using the rainbow table: You can search the rainbow table for the hash value and retrieve the original input that generated the hash.
std::string decryptMD5Hash(const std::string& hash, const std::unordered_map<std::string, std::string>& rainbowTable) {
  auto it = rainbowTable.find(hash);
  if (it != rainbowTable.end()) {
    return it->second;
  }
  return ;
}

Put it all together: Finally, you can tie all of the steps together in the main function.
int main() {
  std::string input = hello world;
  std::string hash = generateMD5(input);
  std::unordered_map<std::string, std::string> rainbowTable = loadRainbowTable(rainbow_table.txt);
  std::string dec