// Copyright (C) 2007-2025 EQ2EMulator
// Licensed under GPL v3

#include "crypto.h"
#include <algorithm>
#include <array>
#include <cstring>
#include <mutex>

int64 Crypto::RSADecrypt(uchar* text, int16 size) noexcept
{
	int64 ret = 0;
	std::array<uchar, 8> buffer{};

	for (int i = 7; i >= 0; --i) {
		buffer[7 - i] = text[i];
	}

	std::memcpy(&ret, buffer.data(), 8);
	return ret;
}

void Crypto::RC4Decrypt(uchar* text, int32 size) noexcept
{
	const std::lock_guard<std::mutex> lock(m_crypto_mutex);
	client->Cypher(text, size);
}

void Crypto::RC4Encrypt(uchar* text, int32 size) noexcept
{
	const std::lock_guard<std::mutex> lock(m_crypto_mutex);
	server->Cypher(text, size);
}

void Crypto::setRC4Key(int64 key) noexcept
{
	rc4_key = key;

	if (key > 0) {
		encrypted = true;
		client = std::make_unique<RC4>(~key);
		server = std::make_unique<RC4>(key);

		std::array<uchar, 20> temp{};
		client->Cypher(temp.data(), 20);
		server->Cypher(temp.data(), 20);
	} else {
		encrypted = false;
		client.reset();
		server.reset();
	}
}