mirror of https://github.com/aria2/aria2
81 lines
2.7 KiB
C++
81 lines
2.7 KiB
C++
/* <!-- copyright */
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/*
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* aria2 - The high speed download utility
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*
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* Copyright (C) 2006 Tatsuhiro Tsujikawa
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* In addition, as a special exception, the copyright holders give
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* permission to link the code of portions of this program with the
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* OpenSSL library under certain conditions as described in each
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* individual source file, and distribute linked combinations
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* including the two.
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* You must obey the GNU General Public License in all respects
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* for all of the code used other than OpenSSL. If you modify
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* file(s) with this exception, you may extend this exception to your
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* version of the file(s), but you are not obligated to do so. If you
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* do not wish to do so, delete this exception statement from your
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* version. If you delete this exception statement from all source
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* files in the program, then also delete it here.
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*/
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/* copyright --> */
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#include "DHTUtil.h"
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#include "MessageDigestHelper.h"
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#include <cassert>
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#include <fstream>
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#include <iomanip>
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#ifdef HAVE_LIBGCRYPT
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# include <gcrypt.h>
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#elif HAVE_LIBSSL
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# include <openssl/rand.h>
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# include "SimpleRandomizer.h"
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#endif // HAVE_LIBSSL
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namespace aria2 {
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void DHTUtil::generateRandomKey(unsigned char* key)
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{
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unsigned char bytes[40];
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generateRandomData(bytes, sizeof(bytes));
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MessageDigestHelper::digest(key, 20, MessageDigestContext::SHA1, bytes, sizeof(bytes));
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}
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void DHTUtil::generateRandomData(unsigned char* data, size_t length)
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{
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#ifdef HAVE_LIBGCRYPT
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gcry_randomize(data, length, GCRY_STRONG_RANDOM);
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#elif HAVE_LIBSSL
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if(RAND_bytes(data, length) != 1) {
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for(size_t i = 0; i < length; ++i) {
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data[i] = SimpleRandomizer::getInstance()->getRandomNumber(UINT8_MAX+1);
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}
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}
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#else
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std::ifstream i("/dev/urandom");
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i.read(data, length);
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#endif // HAVE_LIBSSL
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}
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void DHTUtil::flipBit(unsigned char* data, size_t length, size_t bitIndex)
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{
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size_t byteIndex = bitIndex/8;
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assert(byteIndex <= length);
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unsigned char mask = 128 >> (bitIndex%8);
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data[byteIndex] ^= mask;
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}
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} // namespace aria2
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