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/*
* This file is part of PowerDNS or weakforced.
* 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 3 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 <string>
#include <stdint.h>
#include <arpa/inet.h>
#ifndef HAVE_LIBSODIUM
#include <openssl/evp.h>
#include <openssl/rand.h>
#include <openssl/crypto.h>
#define CHACHA20_POLY1305_IV_SIZE 12
#define CHACHA20_POLY1305_KEY_SIZE 32
struct SodiumNonce
{
void init()
{
if (RAND_priv_bytes(value, sizeof value) != 1) {
throw std::runtime_error("Could not initialize random number generator for cryptographic functions - this is not recoverable");
}
}
void merge(const SodiumNonce& lower, const SodiumNonce& higher)
{
static const size_t halfSize = (sizeof value) / 2;
memcpy(value, lower.value, halfSize);
memcpy(value + halfSize, higher.value + halfSize, halfSize);
}
void increment()
{
uint32_t* p = (uint32_t*)value;
uint32_t count=htonl(*p);
++count;
*p=ntohl(count);
}
std::string toString() const
{
return std::string((const char*)value, sizeof value);
}
unsigned char value[CHACHA20_POLY1305_IV_SIZE];
};
#else
#include <sodium.h>
struct SodiumNonce
{
void init()
{
randombytes_buf(value, sizeof value);
}
void merge(const SodiumNonce& lower, const SodiumNonce& higher)
{
static const size_t halfSize = (sizeof value) / 2;
memcpy(value, lower.value, halfSize);
memcpy(value + halfSize, higher.value + halfSize, halfSize);
}
void increment()
{
uint32_t* p = (uint32_t*)value;
uint32_t count=htonl(*p);
++count;
*p=ntohl(count);
}
std::string toString() const
{
return std::string((const char*)value, crypto_secretbox_NONCEBYTES);
}
unsigned char value[crypto_secretbox_NONCEBYTES];
};
#endif
std::string newKeyStr();
std::string sodEncryptSym(const std::string& msg, const std::string& key, SodiumNonce&);
std::string sodDecryptSym(const std::string& msg, const std::string& key, SodiumNonce&);
std::string newKey();
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