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/*
* This file is part of PowerDNS or dnsdist.
* Copyright -- PowerDNS.COM B.V. and its contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* In addition, for the avoidance of any doubt, permission is granted to
* link this program with OpenSSL and to (re)distribute the binaries
* produced as the result of such linking.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#pragma once
#include "config.h"
#include <array>
#include <string>
#include <cstdint>
#include <cstring>
#if defined(HAVE_LIBSODIUM)
#include <sodium.h>
#endif
namespace dnsdist::crypto::authenticated
{
struct Nonce
{
Nonce() = default;
Nonce(const Nonce&) = default;
Nonce(Nonce&&) = default;
Nonce& operator=(const Nonce&) = default;
Nonce& operator=(Nonce&&) = default;
~Nonce() = default;
void init();
void merge(const Nonce& lower, const Nonce& higher);
void increment();
#if defined(HAVE_LIBSODIUM)
std::array<unsigned char, crypto_secretbox_NONCEBYTES> value{};
#elif defined(HAVE_LIBCRYPTO)
// IV is 96 bits
std::array<unsigned char, 12> value{};
#else
std::array<unsigned char, 1> value{};
#endif
};
std::string encryptSym(const std::string_view& msg, const std::string& key, Nonce& nonce, bool incrementNonce = true);
std::string decryptSym(const std::string_view& msg, const std::string& key, Nonce& nonce, bool incrementNonce = true);
std::string newKey(bool base64Encoded = true);
bool isValidKey(const std::string& key);
constexpr size_t getEncryptedSize(size_t plainTextSize)
{
#if defined(HAVE_LIBSODIUM)
return plainTextSize + crypto_secretbox_MACBYTES;
#elif defined(HAVE_LIBCRYPTO)
return plainTextSize + 16;
#else
return plainTextSize;
#endif
}
}
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