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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,72 @@ | ||
| // Copyright (c) 2009-2010 Satoshi Nakamoto | ||
| // Copyright (c) 2009-2016 The Bitcoin Core developers | ||
| // Distributed under the MIT software license, see the accompanying | ||
| // file COPYING or http://www.opensource.org/licenses/mit-license.php. | ||
|
|
||
| #include "random.h" | ||
| #ifdef _WIN32 | ||
| #include <windows.h> | ||
| #else | ||
| #include <sys/time.h> | ||
| #endif | ||
| #include <openssl/rand.h> | ||
| #include "log.h" | ||
|
|
||
| static void RandFailure() | ||
| { | ||
| xdag_fatal("Failed to read randomness, aborting\n"); | ||
| abort(); | ||
| } | ||
|
|
||
| static inline int64_t GetPerformanceCounter() | ||
| { | ||
| int64_t counter = 0; | ||
| #ifdef _WIN32 | ||
| QueryPerformanceCounter((LARGE_INTEGER*)&counter); | ||
| #else | ||
| timeval t; | ||
| gettimeofday(&t, NULL); | ||
| nCounter = (int64_t)(t.tv_sec * 1000000 + t.tv_usec); | ||
| #endif | ||
| return counter; | ||
| } | ||
|
|
||
| void RandAddSeed() | ||
| { | ||
| #ifdef _WIN32 | ||
| // mix the contents of the screen into the generator. | ||
| RAND_screen(); | ||
| #endif | ||
|
|
||
| // Seed with CPU performance counter | ||
| int64_t nCounter = GetPerformanceCounter(); | ||
| RAND_add(&nCounter, sizeof(nCounter), 1.5); | ||
| } | ||
|
|
||
| void GetRandBytes(unsigned char* buf, int num) | ||
| { | ||
| if(RAND_bytes(buf, num) != 1) { | ||
| RandFailure(); | ||
| } | ||
| } | ||
|
|
||
| uint64_t GetRand(uint64_t max) | ||
| { | ||
| if(max == 0) { | ||
| return 0; | ||
| } | ||
|
|
||
| // The range of the random source must be a multiple of the modulus | ||
| // to give every possible output value an equal possibility | ||
| uint64_t range = UINT64_MAX / max * max; | ||
| uint64_t randValue = 0; | ||
| do { | ||
| GetRandBytes((unsigned char*)&randValue, sizeof(randValue)); | ||
| } while(randValue >= range); | ||
| return (randValue % max); | ||
| } | ||
|
|
||
| int GetRandInt(int max) | ||
| { | ||
| return GetRand(max); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,21 @@ | ||
| // Copyright (c) 2009-2010 Satoshi Nakamoto | ||
| // Copyright (c) 2009-2016 The Bitcoin Core developers | ||
| // Distributed under the MIT software license, see the accompanying | ||
| // file COPYING or http://www.opensource.org/licenses/mit-license.php. | ||
|
|
||
| #ifndef RANDOM_H | ||
| #define RANDOM_H | ||
|
|
||
| #include <stdint.h> | ||
|
|
||
| /* Seed OpenSSL PRNG with additional entropy data */ | ||
| void RandAddSeed(); | ||
|
|
||
| /** | ||
| * Functions to gather random data via the OpenSSL PRNG | ||
| */ | ||
| void GetRandBytes(unsigned char* buf, int num); | ||
| uint64_t GetRand(uint64_t nMax); | ||
| int GetRandInt(int nMax); | ||
|
|
||
| #endif // RANDOM_H |
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