1 /* <!-- copyright */ 2 /* 3 * aria2 - The high speed download utility 4 * 5 * Copyright (C) 2013 Nils Maier 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 * 21 * In addition, as a special exception, the copyright holders give 22 * permission to link the code of portions of this program with the 23 * OpenSSL library under certain conditions as described in each 24 * individual source file, and distribute linked combinations 25 * including the two. 26 * You must obey the GNU General Public License in all respects 27 * for all of the code used other than OpenSSL. If you modify 28 * file(s) with this exception, you may extend this exception to your 29 * version of the file(s), but you are not obligated to do so. If you 30 * do not wish to do so, delete this exception statement from your 31 * version. If you delete this exception statement from all source 32 * files in the program, then also delete it here. 33 */ 34 /* copyright --> */ 35 36 #ifndef D_INTERNAL_DH_KEY_EXCHANGE_H 37 #define D_INTERNAL_DH_KEY_EXCHANGE_H 38 39 #include "common.h" 40 #include "bignum.h" 41 42 namespace aria2 { 43 44 class DHKeyExchange { 45 private: 46 typedef bignum::ulong<1024> n; // aka max. 8096 bits 47 size_t keyLength_; 48 n prime_; 49 n generator_; 50 n privateKey_; 51 n publicKey_; 52 53 public: DHKeyExchange()54 DHKeyExchange() : keyLength_(0) {} 55 56 void init(const unsigned char* prime, size_t primeBits, 57 const unsigned char* generator, size_t privateKeyBits); 58 59 void generatePublicKey(); 60 61 size_t getPublicKey(unsigned char* out, size_t outLength) const; 62 63 void generateNonce(unsigned char* out, size_t outLength) const; 64 65 size_t computeSecret(unsigned char* out, size_t outLength, 66 const unsigned char* peerPublicKeyData, 67 size_t peerPublicKeyLength) const; 68 }; 69 70 } // namespace aria2 71 72 #endif // D_INTERNAL_DH_KEY_EXCHANGE_H 73