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145 lines
3.9 KiB
145 lines
3.9 KiB
/*==LICENSE==* |
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CyanWorlds.com Engine - MMOG client, server and tools |
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Copyright (C) 2011 Cyan Worlds, Inc. |
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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 3 of the License, or |
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(at your option) any later version. |
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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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You should have received a copy of the GNU General Public License |
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along with this program. If not, see <http://www.gnu.org/licenses/>. |
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Additional permissions under GNU GPL version 3 section 7 |
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If you modify this Program, or any covered work, by linking or |
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combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK, |
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NVIDIA PhysX SDK, Microsoft DirectX SDK, OpenSSL library, Independent |
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JPEG Group JPEG library, Microsoft Windows Media SDK, or Apple QuickTime SDK |
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(or a modified version of those libraries), |
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containing parts covered by the terms of the Bink SDK EULA, 3ds Max EULA, |
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PhysX SDK EULA, DirectX SDK EULA, OpenSSL and SSLeay licenses, IJG |
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JPEG Library README, Windows Media SDK EULA, or QuickTime SDK EULA, the |
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licensors of this Program grant you additional |
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permission to convey the resulting work. Corresponding Source for a |
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non-source form of such a combination shall include the source code for |
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the parts of OpenSSL and IJG JPEG Library used as well as that of the covered |
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work. |
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You can contact Cyan Worlds, Inc. by email legal@cyan.com |
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or by snail mail at: |
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Cyan Worlds, Inc. |
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14617 N Newport Hwy |
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Mead, WA 99021 |
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*==LICENSE==*/ |
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#include "plBigNum.h" |
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#include <openssl/rand.h> |
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#include <algorithm> |
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static inline void byteswap(size_t size, uint8_t* data) |
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{ |
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for (size_t i = 0; i < (size / 2); ++i) |
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std::swap(data[i], data[size - i - 1]); |
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} |
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/**************************************************************************** |
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* |
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* plBigNum public methods |
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* |
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***/ |
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plBigNum::plBigNum () : m_context(nil) |
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{ |
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BN_init(&m_number); |
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} |
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plBigNum::plBigNum(const plBigNum& a) : m_context(nil) |
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{ |
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BN_init(&m_number); |
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BN_copy(&m_number, &a.m_number); |
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} |
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plBigNum::plBigNum(unsigned a) : m_context(nil) |
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{ |
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BN_init(&m_number); |
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BN_set_word(&m_number, a); |
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} |
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plBigNum::plBigNum(unsigned bytes, const void* data, bool le) : m_context(nil) |
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{ |
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BN_init(&m_number); |
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if (le) |
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FromData_LE(bytes, data); |
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else |
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FromData_BE(bytes, data); |
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} |
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plBigNum::~plBigNum () |
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{ |
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if (m_context) |
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BN_CTX_free(m_context); |
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BN_free(&m_number); |
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} |
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int plBigNum::Compare(uint32_t a) const |
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{ |
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// -1 if (this < a) |
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// 0 if (this == a) |
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// 1 if (this > a) |
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if (BN_is_word(&m_number, a)) |
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return 0; |
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// This returns 0xFFFFFFFFL if the number is bigger than one uint16_t, so |
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// it doesn't need any size check |
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if (BN_get_word(&m_number) < a) |
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return -1; |
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// Not less or equal, must be greater |
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return 1; |
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} |
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void plBigNum::FromData_LE(uint32_t bytes, const void* data) |
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{ |
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uint8_t* buffer = new uint8_t[bytes]; |
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memcpy(buffer, data, bytes); |
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byteswap(bytes, buffer); |
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BN_bin2bn(buffer, bytes, &m_number); |
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delete[] buffer; |
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} |
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uint8_t* plBigNum::GetData_BE(uint32_t* bytes) const |
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{ |
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*bytes = BN_num_bytes(&m_number); |
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uint8_t* data = new uint8_t[*bytes]; |
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BN_bn2bin(&m_number, data); |
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return data; |
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} |
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uint8_t* plBigNum::GetData_LE(uint32_t* bytes) const |
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{ |
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*bytes = BN_num_bytes(&m_number); |
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uint8_t* data = new uint8_t[*bytes]; |
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BN_bn2bin(&m_number, data); |
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byteswap(*bytes, data); |
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return data; |
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} |
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void plBigNum::Rand(uint32_t bits, plBigNum* seed) |
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{ |
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// this = random number with bits or fewer bits |
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uint32_t seedbytes; |
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uint8_t* seedData = seed->GetData_BE(&seedbytes); |
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RAND_seed(seedData, seedbytes); |
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BN_rand(&m_number, bits, 0, 0); |
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delete[] seedData; |
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}
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