You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
91 lines
2.3 KiB
91 lines
2.3 KiB
/* |
|
* ZeroTier One - Network Virtualization Everywhere |
|
* Copyright (C) 2011-2015 ZeroTier, Inc. |
|
* |
|
* 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 3 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, see <http://www.gnu.org/licenses/>. |
|
* |
|
* -- |
|
* |
|
* ZeroTier may be used and distributed under the terms of the GPLv3, which |
|
* are available at: http://www.gnu.org/licenses/gpl-3.0.html |
|
* |
|
* If you would like to embed ZeroTier into a commercial application or |
|
* redistribute it in a modified binary form, please contact ZeroTier Networks |
|
* LLC. Start here: http://www.zerotier.com/ |
|
*/ |
|
|
|
#ifndef ZT_CMWC4096_HPP |
|
#define ZT_CMWC4096_HPP |
|
|
|
#include <stdint.h> |
|
#include "Utils.hpp" |
|
|
|
namespace ZeroTier { |
|
|
|
/** |
|
* Complement Multiply With Carry random number generator |
|
* |
|
* Based on original code posted to Usenet in the public domain by |
|
* George Marsaglia. Period is approximately 2^131086. |
|
* |
|
* This is not used for cryptographic purposes but for a very fast |
|
* and high-quality PRNG elsewhere in the code. |
|
*/ |
|
class CMWC4096 |
|
{ |
|
public: |
|
/** |
|
* Construct and initialize from secure random source |
|
*/ |
|
CMWC4096() |
|
throw() |
|
{ |
|
Utils::getSecureRandom(Q,sizeof(Q)); |
|
Utils::getSecureRandom(&c,sizeof(c)); |
|
c %= 809430660; |
|
i = 4095; |
|
} |
|
|
|
inline uint32_t next32() |
|
throw() |
|
{ |
|
uint32_t __i = ++i & 4095; |
|
const uint64_t t = (18782ULL * (uint64_t)Q[__i]) + (uint64_t)c; |
|
c = (uint32_t)(t >> 32); |
|
uint32_t x = c + (uint32_t)t; |
|
const uint32_t p = (uint32_t)(x < c); x += p; c += p; |
|
return (Q[__i] = 0xfffffffe - x); |
|
} |
|
|
|
inline uint64_t next64() |
|
throw() |
|
{ |
|
return ((((uint64_t)next32()) << 32) ^ (uint64_t)next32()); |
|
} |
|
|
|
inline double nextDouble() |
|
throw() |
|
{ |
|
return ((double)(next32()) / 4294967296.0); |
|
} |
|
|
|
private: |
|
uint32_t Q[4096]; |
|
uint32_t c; |
|
uint32_t i; |
|
}; |
|
|
|
} // namespace ZeroTier |
|
|
|
#endif
|
|
|