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89 lines
2.1 KiB
89 lines
2.1 KiB
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2014 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include "random.h"
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#include "support/cleanse.h"
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#include "serialize.h" // for begin_ptr(vec)
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#include "util.h" // for LogPrint()
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#include "utilstrencodings.h" // for GetTime()
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#include <limits>
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#ifndef WIN32
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#include <sys/time.h>
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#endif
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#include "sodium.h"
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static inline int64_t GetPerformanceCounter()
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{
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int64_t nCounter = 0;
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#ifdef WIN32
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QueryPerformanceCounter((LARGE_INTEGER*)&nCounter);
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#else
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timeval t;
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gettimeofday(&t, NULL);
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nCounter = (int64_t)(t.tv_sec * 1000000 + t.tv_usec);
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#endif
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return nCounter;
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}
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void GetRandBytes(unsigned char* buf, size_t num)
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{
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randombytes_buf(buf, num);
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}
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uint64_t GetRand(uint64_t nMax)
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{
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if (nMax == 0)
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return 0;
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// The range of the random source must be a multiple of the modulus
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// to give every possible output value an equal possibility
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uint64_t nRange = (std::numeric_limits<uint64_t>::max() / nMax) * nMax;
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uint64_t nRand = 0;
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do {
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GetRandBytes((unsigned char*)&nRand, sizeof(nRand));
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} while (nRand >= nRange);
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return (nRand % nMax);
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}
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int GetRandInt(int nMax)
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{
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return GetRand(nMax);
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}
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uint256 GetRandHash()
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{
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uint256 hash;
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GetRandBytes((unsigned char*)&hash, sizeof(hash));
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return hash;
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}
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uint32_t insecure_rand_Rz = 11;
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uint32_t insecure_rand_Rw = 11;
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void seed_insecure_rand(bool fDeterministic)
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{
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// The seed values have some unlikely fixed points which we avoid.
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if (fDeterministic) {
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insecure_rand_Rz = insecure_rand_Rw = 11;
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} else {
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uint32_t tmp;
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do {
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GetRandBytes((unsigned char*)&tmp, 4);
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} while (tmp == 0 || tmp == 0x9068ffffU);
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insecure_rand_Rz = tmp;
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do {
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GetRandBytes((unsigned char*)&tmp, 4);
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} while (tmp == 0 || tmp == 0x464fffffU);
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insecure_rand_Rw = tmp;
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}
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}
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int GenIdentity(int n)
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{
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return n-1;
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}
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