pdns/sodcrypto.hh

   1 /*
   2  * This file is part of PowerDNS or dnsdist.
   3  * Copyright -- PowerDNS.COM B.V. and its contributors
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * In addition, for the avoidance of any doubt, permission is granted to
  10  * link this program with OpenSSL and to (re)distribute the binaries
  11  * produced as the result of such linking.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21  */
  22 #pragma once
  23 #include "config.h"
  24 #include <string>
  25 #include <stdint.h>
  26
  27 #include <arpa/inet.h>
  28
  29 #ifndef HAVE_LIBSODIUM
  30 struct SodiumNonce
  31 {
  32   void init(){};
  33   void merge(const SodiumNonce& lower, const SodiumNonce& higher) {};
  34   void increment(){};
  35   unsigned char value[1];
  36 };
  37 #else
  38 #include <sodium.h>
  39
  40 struct SodiumNonce
  41 {
  42   void init()
  43   {
  44     randombytes_buf(value, sizeof value);
  45   }
  46
  47   void merge(const SodiumNonce& lower, const SodiumNonce& higher)
  48   {
  49     static const size_t halfSize = (sizeof value) / 2;
  50     memcpy(value, lower.value, halfSize);
  51     memcpy(value + halfSize, higher.value + halfSize, halfSize);
  52   }
  53
  54   void increment()
  55   {
  56     uint32_t* p = (uint32_t*)value;
  57     uint32_t count=htonl(*p);
  58     *p=ntohl(++count);
  59   }
  60
  61   string toString() const
  62   {
  63     return string((const char*)value, crypto_secretbox_NONCEBYTES);
  64   }
  65
  66   unsigned char value[crypto_secretbox_NONCEBYTES];
  67 };
  68 #endif
  69 std::string newKeypair();
  70 std::string sodEncryptSym(const std::string& msg, const std::string& key, SodiumNonce&);
  71 std::string sodDecryptSym(const std::string& msg, const std::string& key, SodiumNonce&);
  72 std::string newKey();
  73 bool sodIsValidKey(const std::string& key);