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/* <!-- copyright */
/*
* aria2 - The high speed download utility
*
* Copyright (C) 2006 Tatsuhiro Tsujikawa
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
/* copyright --> */
#include "DHTUtil.h"
#include "MessageDigestHelper.h"
#include <cassert>
#include <fstream>
#include <iomanip>
#ifdef HAVE_LIBGCRYPT
# include <gcrypt.h>
#elif HAVE_LIBSSL
# include <openssl/rand.h>
# include "SimpleRandomizer.h"
#endif // HAVE_LIBSSL
namespace aria2 {
void DHTUtil::generateRandomKey(unsigned char* key)
{
unsigned char bytes[40];
generateRandomData(bytes, sizeof(bytes));
MessageDigestHelper::digest(key, 20, MessageDigestContext::SHA1, bytes, sizeof(bytes));
}
void DHTUtil::generateRandomData(unsigned char* data, size_t length)
{
#ifdef HAVE_LIBGCRYPT
gcry_randomize(data, length, GCRY_STRONG_RANDOM);
#elif HAVE_LIBSSL
if(RAND_bytes(data, length) != 1) {
for(size_t i = 0; i < length; ++i) {
data[i] = SimpleRandomizer::getInstance()->getRandomNumber(UINT8_MAX+1);
}
}
#else
std::ifstream i("/dev/urandom", std::ios::binary);
i.read(data, length);
#endif // HAVE_LIBSSL
}
void DHTUtil::flipBit(unsigned char* data, size_t length, size_t bitIndex)
{
size_t byteIndex = bitIndex/8;
assert(byteIndex <= length);
unsigned char mask = 128 >> (bitIndex%8);
data[byteIndex] ^= mask;
}
} // namespace aria2
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