Function KeySchedulingAlgorithm

Src/Common/FSecure/CppTools/Encryption.cpp:19–29

@Brief Initialization of pseudo random keystream with key. @param key IN argument. Used to create keystream. @param len IN argument. Size of key in bytes. @param keystream OUT argument. Generated keystream.

	/// @param len IN argument. Size of key in bytes.
	/// @param keystream OUT argument. Generated keystream.
	void KeySchedulingAlgorithm(const char* key, size_t len, unsigned char* keystream)
	{
		for (auto i = 0u; i < N; i++)
			keystream[i] = static_cast<unsigned char>(i);

		for (auto i = 0u, j = 0u; i < N; i++)
		{
			j = (j + keystream[i] + key[i % len]) % N;
			std::swap(keystream[i], keystream[j]);
		}
	}

	/// @brief Encrypting data with usage of keystream.
	///