Function strings_obfuscation

Examples/example/main.cpp:41–76

void strings_obfuscation() {
  // Obfuscate a string literal
  std::cout << "abc"_obf << '\n';
  describe("abc"_obf);

  // Using std::format
  std::cout << std::format("{}\n", "abc"_obf);

  // Obfuscate a string literal and describe it after deobfuscation
  auto s1{"0123456789"_obf};
  describe(s1);
  std::cout << s1 << "\n";
  describe(s1);

  // Construct explicitly an ObfuscatedString
  auto s2 = ObfuscatedString("abcd", {1, KeyAlgorithm::IDENTITY, DataAlgorithm::XOR});
  std::cout << s2 << '\n';
  describe(s2);

  // Construct explicitly an ObfuscatedString with precise obfuscation parameters
  static constexpr Parameters params[] = {
    {.key=1, .key_algo=KeyAlgorithm::IDENTITY, .data_algo=DataAlgorithm::XOR},
    {.key=2, .key_algo=KeyAlgorithm::IDENTITY, .data_algo=DataAlgorithm::XOR}
  };
  auto s3 = ObfuscatedString("abcde", params);
  describe(s3);
  std::cout << s3 << '\n';
  describe(s3);

  static constexpr auto s4 = "An immutable compile-time string"_obf;
  describe(s4);
  // It is not possible to use directly s4 since it is immutable:
  // std::cout << s4 << '\n'; // Compilation failure
  // So use decode() instead:
  std::cout << s4.decode() << '\n';
}

void blocks_obfuscation() {
  static constexpr auto rcon0 = ObfuscatedBytes{"01 02 04 08 10 20 40 80 1b 36"};