diff options
Diffstat (limited to 'src/random.h')
| -rw-r--r-- | src/random.h | 42 |
1 files changed, 21 insertions, 21 deletions
diff --git a/src/random.h b/src/random.h index 1a2d3e8ee..664f030eb 100644 --- a/src/random.h +++ b/src/random.h @@ -1,5 +1,5 @@ // Copyright (c) 2009-2010 Satoshi Nakamoto -// Copyright (c) 2009-2014 The Bitcoin Core developers +// 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. @@ -10,11 +10,8 @@ #include <stdint.h> -/** - * Seed OpenSSL PRNG with additional entropy data - */ +/* Seed OpenSSL PRNG with additional entropy data */ void RandAddSeed(); -void RandAddSeedPerfmon(); /** * Functions to gather random data via the OpenSSL PRNG @@ -25,25 +22,28 @@ int GetRandInt(int nMax); uint256 GetRandHash(); /** - * Seed insecure_rand using the random pool. - * @param Deterministic Use a deterministic seed + * Function to gather random data from multiple sources, failing whenever any + * of those source fail to provide a result. */ -void seed_insecure_rand(bool fDeterministic = false); +void GetStrongRandBytes(unsigned char* buf, int num); /** - * MWC RNG of George Marsaglia - * This is intended to be fast. It has a period of 2^59.3, though the - * least significant 16 bits only have a period of about 2^30.1. - * - * @return random value + * Fast randomness source. This is seeded once with secure random data, but + * is completely deterministic and insecure after that. + * This class is not thread-safe. */ -extern uint32_t insecure_rand_Rz; -extern uint32_t insecure_rand_Rw; -static inline uint32_t insecure_rand(void) -{ - insecure_rand_Rz = 36969 * (insecure_rand_Rz & 65535) + (insecure_rand_Rz >> 16); - insecure_rand_Rw = 18000 * (insecure_rand_Rw & 65535) + (insecure_rand_Rw >> 16); - return (insecure_rand_Rw << 16) + insecure_rand_Rz; -} +class FastRandomContext { +public: + explicit FastRandomContext(bool fDeterministic=false); + + uint32_t rand32() { + Rz = 36969 * (Rz & 65535) + (Rz >> 16); + Rw = 18000 * (Rw & 65535) + (Rw >> 16); + return (Rw << 16) + Rz; + } + + uint32_t Rz; + uint32_t Rw; +}; #endif // BITCOIN_RANDOM_H |